THERAPEUTIC AGENT DELIVERY DEVICE INCLUDING DISPOSABLE AND REUSABLE PORTIONS

Abstract

A therapeutic agent delivery device includes a disposable portion and a reusable portion that detachably carries the disposable portion. The reusable portion includes a drive mechanism having a guide, a rotary actuator, and a follower drivably coupled to the rotary actuator and movably coupled to the guide. The rotary actuator is actuatable to rotatably drive the follower, and the follower thereby follows the guide and translates the drive mechanism. The drive mechanism thereby translates a syringe assembly of the disposable portion from a stowed configuration to a deployed configuration.

Description

CROSS-REFERENCE TO RELATED APPLICATION

Not applicable.

BACKGROUND

The present disclosure pertains to therapeutic agent delivery devices, and, in particular, to a portable therapeutic agent delivery device such as an injector pen.

Patients suffering from a number of different diseases frequently must inject themselves with medication. To allow a person to conveniently and accurately self-administer medicine, a variety of devices broadly known as injector pens or injection pens have been developed. Generally, these pens are equipped with a cartridge including a piston and one or more doses of liquid medication. A drive member, extending from within a base of the injector pen and operably connected with typically more rearward mechanisms of the pen that control drive member motion, is movable forward to advance the piston in the cartridge in such a manner to dispense the contained medication from an outlet at the opposite cartridge end, typically through a needle that penetrates a stopper at that opposite end. In disposable pens, after a pen has been used and exhausted the supply of medication within the cartridge, the entire pen is discarded by a user, who may then begin using a replacement pen. In reusable pens, after a pen has been used and exhausted the supply of medication within the cartridge, the pen is disassembled, the spent cartridge is replaced with a fresh cartridge, and the pen is reassembled for its subsequent use.

It would be desirable to provide a therapeutic agent delivery device with improved features, such as a providing a reusable device that facilitates ease of dispensing medication and/or ease of replacement of a spent cartridge with a fresh cartridge.

SUMMARY

According to an embodiment of the present disclosure, a therapeutic agent delivery device includes a disposable portion and a reusable portion that detachably carries the disposable portion. The disposable portion includes a first housing having a distal end, and a syringe assembly carried by the first housing. The syringe assembly includes a chamber having a passageway, a therapeutic agent carried in the passageway, and a needle in communication with the passageway. The syringe assembly is translatable relative to the first housing from a stowed configuration to a deployed configuration. In the stowed configuration, the needle is disposed proximally relative to the distal end of the first housing, and in the deployed configuration the needle at least partially extends distally from the distal end of the first housing. The reusable portion includes a second housing and a drive mechanism carried by the second housing and coupled to the syringe assembly. The drive mechanism includes a guide, a rotary actuator, and a follower drivably coupled to the rotary actuator and movably coupled to the guide. The rotary actuator is actuatable to rotatably drive the follower, the follower thereby following the guide and translating the drive mechanism relative to the second housing, and the drive mechanism thereby translates the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration.

According to another embodiment of the present disclosure, a therapeutic agent delivery device includes a housing and a syringe assembly carried by the housing. The syringe assembly includes a chamber having a passageway, a therapeutic agent carried in the passageway, a piston movably carried in the passageway, and a needle in communication with the passageway. A therapeutic agent delivery mechanism is carried by the housing. The therapeutic agent delivery mechanism includes a carriage movably carried by the housing, a motor carried by the carriage, a gear train drivably coupled to the motor, and a drive shaft drivably coupled to the gear train. The drive shaft is rotatable relative to the carriage and translatably fixed relative to the carriage. An outer shaft is fixed relative to the carriage, and the outer shaft includes first internal threads. An intermediate shaft is disposed within the outer shaft, and the intermediate shaft is drivably coupled to the drive shaft and rotatable together with the drive shaft relative to the carriage and the outer shaft. The intermediate shaft includes first external threads and second internal threads, and the first external threads threadably couple to the first internal threads of the outer shaft. An inner shaft is disposed within the intermediate shaft and engageable with the piston. The inner shaft is translatable relative to the intermediate shaft and rotatably fixed relative to the outer shaft. The inner shaft includes second external threads, and the second external threads threadably couple to the second internal threads of the intermediate shaft. The motor is actuatable to rotatably drive the gear train, the drive shaft, and the intermediate shaft relative to the carriage, the intermediate shaft thereby rotating and translating relative to the outer shaft, the inner shaft thereby translating relative to the intermediate shaft and translating the piston in the chamber to cause the syringe assembly to deliver the therapeutic agent from the needle.

According to another embodiment of the present disclosure, a therapeutic agent delivery device includes a housing having a distal end and a proximal end and a syringe assembly carried by the housing. The syringe assembly includes a chamber having a passageway, a therapeutic agent carried in the passageway, and a needle in communication with the passageway. A cap covers the proximal end of the housing, and the cap is translatable relative to the housing and fixed relative to the syringe assembly. A compression spring couples the housing to the cap. The syringe assembly and the cap are translatable relative to the housing from a stowed configuration to a deployed configuration. In the stowed configuration the needle is disposed proximally relative to the distal end of the housing. In the deployed configuration the needle at least partially extends distally from the distal end of the housing. The compression spring biases the syringe assembly and the cap away from the deployed configuration and toward the stowed configuration.

According to a further embodiment of the present disclosure, a therapeutic agent delivery device includes a disposable portion and a reusable portion detachably carrying the disposable portion. The disposable portion includes a first housing and a syringe assembly carried by the first housing. The syringe assembly includes a chamber having a passageway, a therapeutic agent carried in the passageway, and a needle in communication with the passageway. The reusable portion includes a second housing and a securing mechanism carried in the second housing. One of the disposable portion and the securing mechanism includes a track, and the other of the disposable portion and the securing mechanism includes a protrusion that is movable along the track. The securing mechanism is actuatable to move the protrusion along the track and thereby secure the disposable portion in the reusable portion.

BRIEF DESCRIPTION OF THE DRAWINGS

The above-mentioned and other advantages and objects of this invention, and the manner of attaining them, will become more apparent, and the invention itself will be better understood, by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a top perspective view of a therapeutic agent delivery device according to an embodiment of the present disclosure.

FIG. 2 is a bottom perspective view of the therapeutic agent delivery device of FIG. 1; a disposable portion is shown detached from a reusable portion.

FIG. 3 is a transverse sectional view of the therapeutic agent delivery device along line 3-3 of FIG. 1; a syringe assembly is shown in a stowed configuration.

FIG. 4 is a transverse sectional view of a distal end of the therapeutic agent delivery device of FIG. 1; the syringe assembly is shown in a deployed configuration.

FIG. 5 is a schematic representation of an electronics assembly of the therapeutic agent delivery device of FIG. 1.

FIG. 6 is a detail transverse sectional view of a proximal end of the therapeutic agent delivery device within line 6 of FIG. 3.

FIG. 7 is a cross sectional view of the proximal end of the therapeutic agent delivery device along line 7-7 of FIG. 1.

FIG. 8 is a cross sectional view of the proximal end of the therapeutic agent delivery device along line 8-8 of FIG. 1.

FIG. 9 is a detail transverse sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in a first configuration.

FIG. 10 is a cross sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in the first configuration.

FIG. 11 is a detail transverse sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in a second configuration.

FIG. 12 is a cross sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in the second configuration.

FIG. 13 is a detail transverse sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in a third configuration.

FIG. 14 is a cross sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in the third configuration.

FIG. 15 is a detail transverse sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in a fourth configuration.

FIG. 16 is a cross sectional view of the proximal end of the therapeutic agent delivery device of FIG. 1 in the fourth configuration.

FIG. 17 is a perspective view of a therapeutic agent delivery mechanism of the therapeutic agent delivery device of FIG. 1.

FIG. 18 is a detail transverse sectional view of the therapeutic agent delivery device within line 18 of FIG. 3.

FIG. 19 is a perspective transverse sectional view of a therapeutic agent delivery mechanism and a syringe assembly according to an embodiment of the present disclosure.

FIG. 20 is a transverse sectional view of the therapeutic agent delivery mechanism and the syringe assembly of FIG. 19; the therapeutic agent delivery mechanism is illustrated in a retracted configuration.

FIG. 21 is a transverse sectional view of the therapeutic agent delivery mechanism and the syringe assembly of FIG. 19; the therapeutic agent delivery mechanism is illustrated in an extended configuration.

FIG. 22 is a perspective view of a disposable portion of the therapeutic agent delivery device of FIG. 1.

FIG. 23 is a transverse sectional view of the disposable portion along line 23-23 of FIG. 22.

FIG. 24 is an exploded perspective view of the disposable portion of FIG. 22.

FIG. 25 is a perspective view of a disposable portion according to an embodiment of the present disclosure.

FIG. 26 is an exploded perspective view of the disposable portion of FIG. 25.

FIG. 27 is a side view of the disposable portion of FIG. 25 in a first configuration.

FIG. 28 is a side view of the disposable portion of FIG. 25 in a second configuration.

FIG. 29 is a side view of the disposable portion of FIG. 25 in a third configuration.

FIG. 30 is an exploded perspective view of a disposable portion according to another embodiment of the present disclosure.

FIG. 31 is a detail side view of the disposable portion of FIG. 30.

FIG. 32 is a perspective view of a securing mechanism of the therapeutic agent delivery device of FIG. 1.

FIG. 33 is a transverse sectional view of the securing mechanism along line 33-33 of FIG. 32.

FIG. 34 is a side view of the securing mechanism of FIG. 32 and a disposable portion in a first configuration.

FIG. 35 is a side view of the securing mechanism of FIG. 32 and the disposable portion in a second configuration.

FIG. 36 is a side view of the securing mechanism of FIG. 32 and the disposable portion in a third configuration.

FIG. 37 is a side view of the securing mechanism of FIG. 32 and the disposable portion in a fourth configuration.

FIG. 38 is a side view of the securing mechanism of FIG. 32 and the disposable portion

in a fifth configuration.

FIG. 39 is a side view of the securing mechanism of FIG. 32 and the disposable portion in a sixth configuration.

FIG. 40 is a transverse sectional view of a securing mechanism according to an embodiment of the present disclosure.

FIG. 41 is a side view of the securing mechanism of FIG. 40 and a disposable portion in a second configuration.

FIG. 42 is a side view of the securing mechanism of FIG. 40 and the disposable portion in a third configuration.

FIG. 43 is a side view of the securing mechanism of FIG. 40 and the disposable portion in a fourth configuration.

FIG. 44 is a side view of the securing mechanism of FIG. 40 and the disposable portion in a fifth configuration.

FIG. 45 is a side view of the securing mechanism of FIG. 40 and the disposable portion in a sixth configuration.

FIG. 46 is a side view of the securing mechanism of FIG. 40 and the disposable portion in a seventh configuration.

Corresponding reference characters indicate corresponding parts throughout the several views. Although the drawings represent embodiments of the present invention, the drawings are not necessarily to scale, and certain features may be exaggerated or omitted in some of the drawings in order to better illustrate and explain the present invention.

DETAILED DESCRIPTION

Therapeutic agent delivery devices according to the present disclosure carry and dispense one or more therapeutic agents, which may also be referred to as medications or drugs. Such therapeutic agents may include, for example, epinephrine, anaesthetics, analgesics, steroids, insulins, insulin analogs such as insulin lispro or insulin glargine, insulin derivatives, GLP-1 receptor agonists such as dulaglutide or liraglutide, glucagon, glucagon analogs, glucagon derivatives, gastric inhibitory polypeptide (GIP), GIP analogs, GIP derivatives, combined GIP/GLP-1 agonists such as tirzepatide, basal insulins, oxyntomodulin analogs, oxyntomodulin derivatives, therapeutic antibodies including but not limited to IL-23 antibody analogs or derivatives, such as mirikizumab, IL-17 antibody analogs or derivatives, such as ixekizumab, therapeutic agents for pain-related treatments, such as galcanzeumab or lasmiditan, or lebrikizumab and any therapeutic agent that is capable of delivery by the devices described herein. Therapeutic agent delivery devices according to the present disclosure are operated in a manner generally as described herein by a user (for example, a healthcare professional, a caregiver, or another person) to deliver one or more therapeutic agents to a patient (for example, another person or the user).

Any directional references used with respect to any of the Figures, such as right or left, up or down, or top or bottom, are intended for convenience of description, and does not limit the present disclosure or any of its components to any particular positional or spatial orientation.

FIGS. 1-4 illustrate a therapeutic agent delivery device 100 according to an exemplary embodiment of the present disclosure. Illustratively, the therapeutic agent delivery device 100 has an injector pen-like shape, although other shapes may alternatively be used. The therapeutic agent delivery device 100 generally includes a reusable portion 102, which may also be referred to as a drive portion, and a disposable portion 104, which may also be referred to as a drug carrying portion or cartridge. The reusable portion 102 facilitates delivery of a therapeutic agent 106 (FIGS. 3 and 4) from the disposable portion 104. In addition, the disposable portion 104 detachably couples to the reusable portion 102 such that after the therapeutic agent 106 has been delivered from the disposable portion 104, the disposable portion 104 may be detached from the reusable portion 102 and discarded. Another disposable portion (not shown—for example, having the same or different features than the disposable portion 104) may then be attached to the reusable portion 102, and the therapeutic agent delivery device 100 is thereby ready for subsequent use.

The therapeutic agent delivery device 100 also includes a proximal end 108 and an opposite distal end 110. During use of the therapeutic agent delivery device 100, the proximal end 108 would be further from the patient and configured to be actuated by the user, and the distal end 110 would be closer to the patient and configured to deliver the therapeutic agent 106 to the patient. The therapeutic agent delivery device 100 also includes a longitudinal axis

A extending between the proximal end 108 and the distal end 110. These and other features of the therapeutic agent delivery device 100 are described in further detail below.

With specific reference to the transverse sectional views of FIGS. 3 and 4, internal components and other features of the reusable portion 102 and the disposable portion 104 are illustrated. Generally, the reusable portion 102 includes a housing 112 that movably carries a user input 114 and a drive mechanism 116 (both shown in FIG. 3). The user input 114 is actuatable (for example, depressible) by a user to actuate the drive mechanism 116. The drive mechanism 116 thereby translates distally to drive a syringe assembly 118 of the disposable portion 104. More specifically, the drive mechanism 116 translatably drives the syringe assembly 118 from a stowed configuration (FIG. 3) to a deployed configuration (FIG. 4). In the stowed configuration, a needle 120 of the syringe assembly 118 is disposed proximally relative to a distal end 122 of the disposable portion 104. Stated another way, in the stowed configuration the needle 120 is retracted within the device 100. In the deployed configuration (FIG. 4), the needle 120 at least partially extends distally from the distal end 122 of the disposable portion 104. As a result, in the deployed configuration the needle 120 is configured to pierce the skin of a patient.

With specific reference to FIG. 3, the drive mechanism 116 of the reusable portion 102 also includes a plunger mechanism or therapeutic agent delivery mechanism 124. The therapeutic agent delivery mechanism 124 is actuatable to discharge the therapeutic agent 106 from the syringe assembly 118. More specifically, when the syringe assembly 118 is in the deployed configuration, the therapeutic agent delivery mechanism 124 is actuatable to distally translate a shaft or plunger 126 of the syringe assembly 118. The plunger 126 distally drives a piston 128 carried in a therapeutic agent-carrying passageway 130 of the syringe assembly 118, which causes the therapeutic agent 106 to be discharged via the needle 120. Additional details of these components are described below.

With brief specific reference to FIG. 4, the distal end 110 of the device 100 further includes a securing mechanism 132 for selectively securing the disposable portion 104 to the reusable portion 102. The securing mechanism 132 also facilitates easily attaching the disposable portion 104 to the reusable portion 102 and detaching the disposable portion 104 from the reusable portion 102. The components and features of the securing mechanism 132 are described in further detail below.

Referring to FIG. 5, in addition to the above components, the therapeutic agent delivery device 100 also includes an electronics assembly 134 that facilitates operating the device 100 in the manners described herein. The electronics assembly 134 includes an electronic controller 136 that is operatively coupled to and receives power from a power supply 138, such as a battery. The electronic controller 136 also operatively couples to the user input 114 and one or more sensors 140. As described in further detail below, the sensors 140 may sense, for example, actuation of components of the device 100, positions of components of the device 100 relative to each other, and/or the position of the device 100 relative to a patient. The controller 136 further operatively couples to the drive mechanism 116 (FIG. 3), the therapeutic agent delivery mechanism 124 (FIG. 3), and the securing mechanism 132 (FIG. 4).

In some embodiments and as described in further detail below, some components of the electronics assembly 134 are carried by the reusable portion 102 and some components are carried by the disposable portion 104 (both shown in FIGS. 1 and 4). For example, the disposable portion 104 may include an identifier 142 (for example, an RFID transmitter or EEPROM) to facilitate providing properties of the therapeutic agent 106 to the reusable portion 102. Such properties may include, for example, the type and/or volume of the therapeutic agent 106 carried by the syringe assembly 118. The reusable portion 102 may use the properties of the therapeutic agent 106 to determine, for example, if a patient associated with the reusable portion 102 is authorized to use, or has been prescribed, the therapeutic agent 106. As another example, a disposable portion may include securing device 144 that is operably coupled to the controller 136. The securing device 144 may initially inhibit the syringe assembly 118 from moving from the stowed configuration to the deployed configuration, and the controller 136 may actuate the securing device 144 to permit the syringe assembly 118 to move from the stowed configuration to the deployed configuration. In other embodiments, each of the components of the electronics assembly 134 is carried by the reusable portion 102. In some embodiments, the controller 136 is operatively coupled to one or more of the other components of the electronics assembly 134 by a wired connection. In some embodiments, the controller 136 is operatively coupled to one or more of the other components of the electronics assembly 134 by a wireless connection.

Referring now to FIGS. 6-8, the proximal end 108 of the device 100, specifically the user input 114 and a proximal portion of the drive mechanism 116, is shown in further detail. The drive mechanism 116 includes a carriage 146 (FIG. 6) that is translatably carried in the housing 112 of the reusable portion 102. The carriage 146 carries a first actuator 148 that operatively couples to the electronic controller 136 (FIG. 5). The first actuator 148 may be a rotary actuator, more specifically an electric motor, that drivably couples to a transmission or speed reducer. The actuator 148 drivably couples to a gear train 150, more specifically a first gear 152 that drivably couples to a second gear 154. The second gear 154 is fixed relative to a follower 156, and the follower 156 is rotatably carried by the carriage 146. As such, the carriage 146, the actuator 148, the gear train 150, and the follower 156 are translatable together within the housing 112 of the reusable portion 102. Illustratively, the carriage 146, the actuator 148, the gear train 150, and the follower 156 are translatable in a drive direction 158 (FIG. 6) that is substantially parallel to the longitudinal axis A of the device 100 (that is, parallel ±10 degrees).

The follower 156 movably couples to a guide 160, and the guide 160 is fixed relative to the housing 112 of the reusable portion 102. A compression spring 162 urges the follower 156 distally and into engagement with the guide 160. Generally, the follower 156 and the guide 160 includes features that facilitate translating the follower 156 relative to the guide 160 as the follower 156 rotates relative to the guide 160 about a rotation axis R1 that is substantially parallel to the longitudinal axis A of the device 100 (that is, parallel ±10 degrees). More specifically, the follower 156 includes two radially-outwardly extending protrusions 164 that move along an angular track 166, or generally proximally-facing wall, defined by the guide 160 as the follower 156 is rotated by the actuator 148. The protrusions 164 simultaneously move along two similar sections, or halves, of the track 166. Referring specifically to FIGS. 7 and 8, each half of the track 166 includes a plateau portion 168 that couples to a cliff portion 170 at an edge 172, a valley portion 174 coupled to the cliff portion 170 opposite the plateau portion 168, and a slope portion 176 coupled to the valley portion 174 opposite the cliff portion 170. Each slope portion 176 also couples to the plateau portion 168 of the other half of the track 166.

In the illustrated embodiment, the various portions of the track 166 are as follows. The cliff portions 170 are substantially parallel to the longitudinal axis A of the device 100 (that is, parallel ±10 degrees). The plateau portions 168 and the valley portions 174 are substantially perpendicular to the longitudinal axis A of the device 100 (that is, perpendicular ±10 degrees). The slope portions 176 extend helically relative to the longitudinal axis A of the device 100.

In other embodiments, the follower 156 and/or the guide 160 may have different forms. For example, the track 166 could have a different shape. More specifically, the track could include additional slope portions (not shown) instead of the cliff portions 170, and such slope portions could extend helically in the opposite directions as the slope portions 176. As another example, the follower 156 could include a different number of protrusions 164 and/or the guide 160 could include a track 166 with a different number of similar sections. As yet another example, the follower 156 could include a track 166 that movably receives one or more protrusions 164 formed on the guide 160.

With specific reference now to FIG. 6, the proximal end 108 of the device 100 also includes features for selectively inhibiting motion of the user input 114 relative to the housing 112 of the reusable portion 102 and, as a result, actuation of the user input 114. More specifically, the user input 114 includes snap hooks 178 that extend through openings 180 formed in the guide 160. The hooks 178 engage the guide 160 and hold the user input 114 in a depressed configuration relative to the housing 112. With specific reference now to FIGS. 6 and 8, the follower 156 includes legs 182 (FIG. 8) that engage and release the hooks 178 from the guide 160 as the follower 156 rotates relative to the guide 160. When the hooks 178 disengage the guide 160, a compression spring 184 expands and pushes the user input 114 to an elevated configuration relative to the housing 112. These features are described in further detail in the following paragraphs.

Referring to FIGS. 9-16, motion and several configurations of the various components at the proximal end 108 of the device 100 are as follows. Although the device 100 may remain in some of the configurations for certain periods of time, other configurations are shown for illustrative purposes, and the device 100 may simply transition through those configurations without remaining in them for a period of time. FIGS. 9 and 10 illustrate a first configuration of the components at the proximal end 108 of the device 100. In the first configuration, the snap hooks 178 of the user input 114 engage the guide 160 and hold the user input 114 in the depressed configuration, and the user input 114 is not actuatable by a user. In the first configuration, the legs 182 of the follower 156 (FIG. 10) are disposed apart from the hooks 178, and the protrusions 164 of the follower 156 (FIG. 10) are disposed in the plateau portions 168 of the guide 160 (FIG. 8).

As shown in FIGS. 11 and 12, the first actuator 148 (FIG. 6) rotatably drives the follower 156 (illustratively, in a clockwise direction as viewed from the proximal end 108) such that the device 100 moves to a second configuration. Moving to the second configuration causes the legs 182 of the follower 156 to engage and release the hooks 178 of the user input 114 from the guide 160, and the compression spring 184 (FIG. 11) expands and pushes the user input 114 to the elevated configuration. However, the legs 182 of the follower 156 are aligned with the hooks 178, and the follower 156 thereby inhibits actuation of the user input 114. In the second configuration, the protrusions 164 of the follower 156 remain disposed in the plateau portions 168 of the guide 160 (all shown in FIG. 8).

Next and as shown in FIGS. 13 and 14, the first actuator 148 (FIG. 6) rotatably drives the follower 156 (in the same direction—illustratively, the clockwise direction as viewed from the proximal end 108) such that the device 100 moves to a third configuration. In the third configuration, the legs 182 of the follower 156 are disposed apart from the hooks 178 of the user input 114, and the follower 156 thereby permits actuation of the user input 114. In the third configuration, the protrusions 164 of the follower 156 (one protrusion 164 being visible in FIG. 14) remain disposed in the plateau portions 168 of the guide 160 (FIG. 8).

As shown in FIGS. 15 and 16, upon actuation of the user input 114, the first actuator 148 (FIG. 6) rotatably drives the follower 156 (in the same direction—illustratively, the clockwise direction as viewed from the proximal end 108) such that the device 100 moves to a fourth configuration. Moving to the fourth configuration causes the protrusions 164 of the follower 156 (one protrusion 164 being visible in FIG. 16) to move over the edges 172 and cliff portions 170 of the guide 160 (FIG. 8). This action permits the spring 162 (FIG. 15) to expand and distally push the follower 156 until the protrusions 164 of the follower 156 engage the valley portions 174 of the guide 160 (FIG. 8). The follower 156 thereby distally pushes the carriage 146 (FIG. 6). The carriage 146 pushes the syringe assembly 118 (FIGS. 3 and 4) from the stowed configuration to the deployed configuration, and the syringe assembly 118 may then deliver the therapeutic agent to the patient. Actuation of the user input 114 also reengages the snap hooks 178 of the user input 114 with the guide 160, which holds the user input 114 in the depressed configuration.

Although not specifically illustrated, the first actuator 148 then rotatably drives the follower 156 such that the device 100 moves to the first configuration. More specifically, the protrusions 164 of the follower 156 to move over the slope portions 176 of the guide 160 (FIG. 8) to move the follower 156. The syringe assembly 118 returns from the deployed configuration to the stowed configuration, and the disposable portion 104 may be replaced with a fresh disposable portion 104.

With continued general reference to FIGS. 9-16 and additional reference to FIG. 5, the electronics assembly 134 may cause the device 100 to transition through the above configurations upon detecting one or more conditions. For example, the sensors 140 of the electronics assembly 134 may include a proximity sensor for detecting detachment of one or more components of the disposable portion 104 from the device 100, such as a needle shield (shown elsewhere). Upon detecting detachment of the needle shield from the disposable portion 104, the device 100 may transition from the first configuration to the second configuration. As another example, the sensors 140 may include a contact sensor for detecting contact between the distal end 110 of the device 100 and the skin of the patient. Upon detecting contact with the skin of the patient, the device 100 may transition from the second configuration to the third configuration. In some embodiments, the electronics assembly 134 may facilitate illuminating the user input 114 to indicate that the user input 114 is ready for actuation. As yet another example, the sensors 140 may include a contact sensor or a proximity sensor for detecting actuation of the user input 114.

FIGS. 17 and 18 illustrate the therapeutic agent delivery mechanism 124 of the device 100. In the transverse sectional view of FIG. 18, the therapeutic agent delivery mechanism 124 is also illustrated adjacent other components of the device 100, such as the carriage 146, a syringe chamber 186, the piston 128.

With continued reference to FIGS. 17 and 18, the therapeutic agent delivery mechanism 124 is carried by and translates with the carriage 146 relative to the housing 112 of the reusable portion 102. The therapeutic agent delivery mechanism 124 includes a second actuator 188 that operatively couples to the electronic controller 136 (FIG. 5). The second actuator 188 may be a rotary actuator, more specifically an electric motor, that drivably couples to a transmission or speed reducer. The actuator 188 drivably couples to a gear train 190, more specifically a first gear 192 that drivably couples to a second gear 194. The second gear 194 includes internal threads 196 (FIG. 18) that couple to external threads 198 of the plunger 126. The plunger 126 is rotatably fixed but translatable relative to the carriage 146 (FIG. 18). Specifically, the plunger 126 couples to the carriage 146 via a key and slot interface, more specifically the plunger 126 includes external slots 200 that receive keys 202 (FIG. 18) formed on the carriage 146. The plunger 126 also includes a ram 204 for engaging the piston 128 of the syringe assembly 118.

With further reference to FIGS. 17 and 18, motion of the various components of the therapeutic agent delivery mechanism 124 is as follows. The actuator 188 is energized to rotatably drive the gear train 190 relative to the carriage 146. The plunger 126 thereby translates relative to the second gear 194 and the carriage 146. The plunger 126 distally pushes the piston 128 in the syringe chamber 186. As described above, such motion of the piston 128 causes the syringe assembly 118 to deliver the therapeutic agent from the needle (shown elsewhere).

With general reference to FIGS. 1-18, the controller 136 (FIG. 5) may actuate the drive mechanism 116 and the therapeutic agent delivery mechanism 124 sequentially upon detecting one or more conditions. More specifically, in some embodiments the drive mechanism 116 is actuated to move the syringe assembly 118 from the stowed configuration to the deployed configuration, and thereafter the therapeutic agent delivery mechanism 124 is actuated to drive the plunger 126 and the piston 128 and thereby deliver the therapeutic agent 106 from the needle 120. In these embodiments, the sensors 140 of the electronics assembly 134 may include a position sensor, such as an encoder (not shown) coupled to the actuator 148, for determining if the syringe assembly 118 is in the stowed configuration or the deployed configuration. Upon detecting that the syringe assembly 118 is in the deployed configuration, the therapeutic agent delivery mechanism 124 may be actuated to deliver the therapeutic agent 106 from the needle 120. After delivering the therapeutic agent 106, the drive mechanism 116 is actuated again to permit the syringe assembly 118 to move from the deployed configuration to the stowed configuration, and then the therapeutic agent delivery mechanism 124 is actuated again to retract the plunger 126 from the syringe assembly 118. More specifically, upon detecting that the syringe assembly 118 has returned to the stowed configuration, the therapeutic agent delivery mechanism 124 is actuated to retract the plunger 126 from the syringe assembly 118.

FIGS. 19-21 illustrate a therapeutic agent delivery mechanism 224 according to another exemplary embodiment of the present disclosure. The therapeutic agent delivery mechanism 224 may be used in place of the therapeutic agent delivery mechanism 124 of the therapeutic agent delivery device 100 (both shown elsewhere). As such, the therapeutic agent delivery mechanism 224 would be carried by the carriage 146 of the drive mechanism 116 (both shown elsewhere). The therapeutic agent delivery mechanism 224 and the drive mechanism 116 could also be operated using similar sequences as those described above. The therapeutic agent delivery mechanism 224 is also illustrated as being coupled to the syringe assembly 118, more specifically the syringe chamber 186 and the piston 128.

With continued reference to FIGS. 19-21, the therapeutic agent delivery mechanism 224 includes the second actuator 188 of the electronics assembly 134 (FIG. 5). The actuator 188 drivably couples to a gear train 290 (FIG. 19), more specifically a first gear 292 that drivably couples to a second gear 294. The second gear 294 drivably couples to a non-round drive shaft 306, more specifically a square drive shaft 306. The drive shaft 306 is rotatable relative to the carriage 146 of the drive mechanism 116 (both shown elsewhere) and translatably fixed relative to the carriage 146. The drive shaft 306 is rotatably driven by the gear train 290. The drive shaft 306 drivably couples to an intermediate shaft 308, and the drive shaft 306 is received in a non-round cross-sectional opening 310 of the intermediate shaft 308, more specifically a square cross-sectional opening 310. The intermediate shaft 308 is thereby rotatable together with the drive shaft 306 relative to the carriage, but translatable relative to the drive shaft 306. The intermediate shaft 308 includes external threads 312 and internal threads 314. The external threads 312 couple to internal threads 316 of an outer shaft 318, and the internal threads 316 couple to external threads 320 of an inner shaft or plunger 322. The outer shaft 318 is fixed relative to the carriage, for example, via a mounting bracket (not shown). The plunger 322 is rotatably fixed relative to the outer shaft 318 via a sleeve 324. More specifically, one or both of the plunger 322 and the outer shaft 318 couple to the sleeve 324 via key and slot interfaces (not shown). As a result, the plunger 322 and the outer shaft 318 are rotatably fixed relative to the sleeve 324 and, therefore, each other. The plunger 322 also includes a ram 326 for engaging the piston 128 of the syringe assembly 118.

With further reference to FIGS. 19-21 and more specifically FIGS. 20 and 21, motion of the various components of the therapeutic agent delivery mechanism 224 is as follows. The rotary actuator 188 is energized to rotatably drive the gear train 290, the drive shaft 306, and the intermediate shaft 308 relative to the outer shaft 318 and the carriage (shown elsewhere). The intermediate shaft 308 thereby rotates and translates relative to the outer shaft 318, and the plunger 322 thereby translates relative to the intermediate shaft 308. The plunger 322 distally pushes the piston 128 in the syringe chamber 186. As described above, such motion of the piston 128 causes the syringe assembly 118 to deliver the therapeutic agent 106 from the needle 120 (both shown elsewhere).

FIGS. 22-24 illustrate the disposable portion 104 of the device 100. With specific reference to the section view of FIG. 23 and the exploded view of FIG. 24, the disposable portion 104 includes a housing 400 having a proximal end 402 (FIG. 23) and a distal end 404. A proximal cap 406 covers the proximal end 402 of the housing 400. The proximal cap 406 is fixed relative to the syringe assembly 118 and movable relative to the housing 400, and the proximal cap 406 and the syringe assembly 118 are thereby movable together relative to the housing 400. As a result, the drive mechanism 116 (FIG. 6) distally pushes the proximal cap 406 to cause the syringe assembly 118 to move from the stowed configuration to the deployed configuration.

With continued reference to FIGS. 23 and 24, internally the disposable portion 104 includes a compression spring 408. The compression spring 408 is compressed between an internal flange 410 (FIG. 23) in the housing 400 and an internal end wall 412 (FIG. 23) of the proximal cap 406. The compression spring 408 biases the syringe assembly 118 and the proximal cap 406 away from the deployed configuration and toward the stowed configuration. As a result, the compression spring 408 pushes the syringe assembly 118 and the proximal cap 406 from the deployed configuration to the stowed configuration after the needle 120 delivers the therapeutic agent 106 (FIG. 23) and the drive mechanism 116 (FIG. 6) moves proximally in the housing 112 of the reusable portion 102 (FIG. 3).

At the distal end 404 of the housing 400, the disposable portion 104 carries a needle shield 414, a shield puller 416, and a base cap 418. The needle shield 414 the shield puller 416, and the base cap 418 initially obscures the needle 120 of the syringe assembly 118. The needle shield 414, the shield puller 416, and the base cap 418 are fixed relative to each other and together detachable from the housing 400 to facilitate delivering the therapeutic agent 106 from the needle 120. The distal end 404 defines an axial opening 423 in which a proximal portion of the base cap 418 is inserted therein. A rib 425 can be disposed along an interior surface of the housing 400 and extends radially inward. The rib may extend axially from the distal surface. The radial extent of the rib 425 is sized to reduce the cross-sectional area of the axial opening 423 relative to the size of the axial opening without such rib. More than one rib 425 may be included and arranged, such as, for example, having the ribs circumferentially spaced apart from one another. The smaller cross-sectional area defined by the one or more ribs 425 may inhibit an object of certain sizes from entering into the axial opening 423 after the base cap 418 is removed.

With specific reference to FIG. 24, the housing 400 also includes features for securing the disposable portion 104 to the reusable portion 102 via the securing mechanism 132 (both shown in FIGS. 3). More specifically, the housing 400 includes one or more protrusions 420 and one or more magnetic elements 422 (for example, one or more permanent magnets) for coupling to the securing mechanism 132 and the reusable portion 102. These features are described in further detail below.

FIGS. 25-27 illustrate a disposable portion 504 according to another exemplary embodiment of the present disclosure. The disposable portion 504 may be used in place of the disposable portion 104 of the device 100 (both shown elsewhere). The disposable portion 504 is generally similar to the disposable portion 104, and similar features are identified with similar reference numbers. In contrast to the disposable portion 104, the disposable portion 504 further includes a mechanism 526 for locking out the disposable portion 504 after delivering the therapeutic agent (not shown). More specifically, the lock-out mechanism 526 permits the syringe assembly 518 (FIG. 26) to move from the stowed configuration to the deployed configuration and return to the stowed configuration only once. In the illustrated embodiment, the lock-out mechanism 526 includes a guide 528 defined by the housing 500 and one or more protrusions 530 (illustratively, three protrusions 530, one of which is shown in FIG. 27) defined by the proximal cap 506. The guide 528 includes one or more tracks 532 (illustratively, three tracks 532), or slots, and each of the tracks 532 movably receives one of the protrusions 530. Each track 532 includes a first track portion 534 and a second track portion 536. The first track portion 534 extends substantially parallel to a longitudinal axis B of the disposable portion 104 (that is, that is, parallel ±10 degree). The first track portion 534 couples to the second track portion 536 at a distal end 538, and the second track portion 536 extends helically relative to the longitudinal axis B.

With reference to FIGS. 27-29, operation of the lock-out mechanism 526 is as follows. As shown in FIG. 27, each protrusion 530 is received at a proximal end 540 of one of the first track portions 534 when the syringe assembly 518 (FIG. 26) is initially in the stowed configuration. As shown in FIG. 28, when the proximal cap 506 and the syringe assembly 518 (FIG. 26) translate distally relative to the housing 500 and the syringe assembly 518 moves to the deployed configuration, each protrusion 530 moves along the first track portion 534 and arrives at the distal end 538 of the associated track 532. As shown in FIG. 29, when the cap 506 and the syringe assembly 518 (FIG. 26) translate proximally relative to the housing 500 and the syringe assembly 518 returns to the stowed configuration, the cap 506 pivots relative to the housing 500, for example, due to torsional energy stored by the compression spring 508 (FIG. 26). As a result, each protrusion 530 moves along the second track portion 536 and arrives at a proximal end 542 of the second track portion 536 of the associated track 532. When each protrusion 530 arrives at the proximal end 542 of the second track portion 536, each protrusion 530 may be inhibited from moving away from the proximal end 542, for example, by snap features (not shown) and/or interference between each protrusion 530 and the associated track 532.

In other embodiments, the lock-out mechanism 526 may take other forms. For example, the proximal cap 506 could define a guide including one or more tracks, and the housing 500 could include one or more protrusions that are movably received by the tracks 532.

FIGS. 30 and 31 illustrate a disposable portion 604 according to yet another exemplary embodiment of the present disclosure. The disposable portion 604 may be used in place of the disposable portion 104 of the device 100 (both shown elsewhere). The disposable portion 604 is generally similar to the disposable portion 104, and similar features are identified with similar reference numbers. In contrast to the disposable portion 104, the disposable portion 604 further includes the securing device 144 of the electronics assembly 134 (FIG. 5), as briefly described above. Generally, the securing device 144 initially inhibits the base cap 618, and as a result the shield puller 614 and the needle shield 616 (both shown in FIG. 30), from being detached from the housing 600. The securing device 144 thereby inhibits the syringe assembly 618 from moving from the stowed configuration to the deployed configuration. The controller 136 (FIG. 5) actuates the securing device 144 to permit the syringe assembly 618 to move from the stowed configuration to the deployed configuration. In some embodiments, the controller 136 actuates the securing device 144 upon determining that one or more conditions have been met. For example, the controller 136 may actuate the securing device 144 upon determining that the disposable portion 604 has been coupled to the reusable portion 102 (FIGS. 1-18) and/or determining that a patient associated with the reusable portion 102 has been prescribed the therapeutic agent (not shown).

With continued reference to FIGS. 30 and 31, the securing device 144 illustratively includes a retainer 644, more specifically a shaped wire, and a release device 646 (FIG. 31), more specifically a wire constructed of one or more shape memory materials. The retainer 644 is carried by and partially extends around the housing 600. The retainer 644 includes one or more transversely extending feet 648 (illustratively, two feet 648). The base cap 618 includes one or more apertures 650 (illustratively, two apertures 650—FIG. 31), and each of the apertures 650 initially receives one of the feet 648. The release device 646 is also carried by and extends at least partially around the housing 600. The release device 646 also extends proximate the feet 648 of the retainer 644. The release device 646 is actuatable, more specifically contractable, for example, by receiving thermal energy from the controller 136 (FIG. 5). Actuation causes the release device 646 to pull the feet 648 of the retainer 644 from the apertures 650 of the base cap 618. This action permits the base cap 618, the shield puller 614, and the needle shield 616 to be detached from the disposable portion 604, which permits the therapeutic agent to be delivered from the needle (not shown).

FIGS. 32 and 33 illustrate the securing mechanism 132 of the device 100. The securing mechanism 132 is carried within the housing 112 of the reusable portion 102 and adjacent to the distal end 110 (all shown in FIG. 3). The securing mechanism 132 includes a third actuator 700 that operatively couples to the electronic controller 136 (FIG. 5). The third actuator 700 may be a rotary actuator, more specifically an electric motor, that drivably couples to a transmission or speed reducer. The actuator 700 drivably couples to a gear train 702, more specifically a first gear 704 that drivably couples to a second gear 706. The second gear 706 is monolithically formed with, or otherwise fixed relative to, a proximal cylinder 708. The proximal cylinder 708 is rotatably coupled to a distal cylinder 710, which is fixed relative to relative to the housing 112 of the reusable portion 102. The proximal cylinder 708 rotates relative to the distal cylinder 710 about a securing rotation axis R2 that is substantially parallel to the longitudinal axis A of the device 100 (that is, parallel ±10 degrees).

With continued reference to FIGS. 32 and 33, the proximal cylinder 708 and the distal cylinder 710 include features that facilitate selectively securing the disposable portion 104 to the reusable portion 102 (both shown in FIG. 3). More specifically, an internal surface 712 of the distal cylinder 710 includes one or more leading tracks 714 (illustratively, two leading tracks 714—only one leading track 714 is visible in FIGS. 32 and 33), or slots, for receiving the protrusions 420 of the disposable portion 104. Similarly, an internal surface 716 of the proximal cylinder 708 (FIG. 33) includes one or more securing tracks 718 (illustratively, two securing tracks 718—only one securing track 718 is visible in FIG. 33), or slots, for receiving the protrusions 420 of the disposable portion 104. As described in further detail below, the proximal cylinder 708 rotates relative to the distal cylinder 710 to selectively align and misalign the securing tracks 718 with the leading tracks 714. These actions permit and inhibit, respectively, the protrusions 420 of the disposable portion 104 to move between the leading tracks 714 and the securing tracks 718, which facilitates selectively securing the disposable portion 104 to the reusable portion 102.

With further reference to FIGS. 32 and 33, each leading track 714 of the distal cylinder 710 includes an inverted general funnel shape. More specifically, each leading track 714 includes a tapering distal portion 720 and a relatively narrow proximal portion 722. Each distal portion 720 tapers in width proceeding proximally. More specifically, each distal portion 720 includes two oppositely helically extending walls 724 that couple to the proximal portion 722.

As a result, the walls 724 are configured to direct the protrusions 420 of the disposable portion 104 toward the proximal portion 722 as the disposable portion 104 is coupled to the reusable portion 102. The proximal portion 722 of each leading track 714 may have a width that is slightly larger than the width of the protrusions 420 of the disposable portion 104. The proximal portion 722 of each leading track 714 may be substantially parallel to the longitudinal axis A (that is, parallel ±10 degrees).

With specific reference to FIG. 33, each securing track 718 of the proximal cylinder 708 includes an entry portion 726, a securing portion 728, and an egress portion 730. The entry portion 726 of each securing track 718 is selectively alignable with one of the leading tracks 714 to facilitate receiving the protrusions 420 of the disposable portion 104 therefrom. The entry portion 726 of each securing track 718 may be substantially parallel to the longitudinal axis A (that is, parallel ±10 degrees). As such, the entry portion 726 may be referred to as a longitudinal portion. Opposite the leading track 714, the entry portion 726 of each securing track 718 couples to the securing portion 728. The securing portion 728 may be substantially perpendicular to the longitudinal axis A (that is, perpendicular ±10 degrees). As such, the securing portion 728 may be referred to as a transverse portion. Opposite the entry portion 726, the securing portion 728 of each securing track 718 couples to the egress portion 730. The egress portion 730 of each securing track 718 may extend helically relative to the longitudinal axis A and away from the securing portion 728. As such, the egress portion 730 may be referred to as a helical portion. The egress portion 730 is selectively alignable with one of the leading tracks 714 to facilitate transferring the protrusions 420 of the disposable portion 104 thereto.

Referring to FIGS. 34-39, motion and several configurations of the securing mechanism 132 and the disposable portion 104 are as follows. Although the securing mechanism 132 and the disposable portion 104 may remain in some of the configurations for certain periods of time, other configurations are shown for illustrative purposes, and the securing mechanism 132 and the disposable portion 104 may simply transition through those configurations without remaining in them for a period of time. FIG. 34 illustrates a first or initial configuration of the securing mechanism 132 and the disposable portion 104. In the first configuration, the disposable portion 104 is detached from the securing mechanism 132 and the reusable housing 112 (FIG. 3).

The disposable portion 104 is advanced proximally and toward the securing mechanism 132 to arrive in a second configuration, as shown in FIG. 35. In the second configuration, the housing 400 of the disposable portion 104 is received in the distal cylinder 710 and the proximal cylinder 708. In the second configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 35) have also entered the leading tracks 714 of the distal cylinder 710 (one leading track 714 being visible in FIG. 35). In the second configuration, the leading tracks 714 of the distal cylinder 710 are aligned with the entry portions 726 of the securing tracks 718 of the proximal cylinder 708 (one entry portion 726 being visible in FIG. 35).

The disposable portion 104 is advanced further proximally to arrive in a third configuration, as shown in FIG. 36. In the third configuration, the base cap 418 of the disposable portion 104 abuts the securing mechanism 132 and the distal end 110 of the device 100 (shown elsewhere). In the third configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 36) have also traversed the entry portions 726 of the securing tracks 718 of the proximal cylinder 708 (one entry portion 726 and one securing track 718 being visible in FIG. 36). The magnetic elements 422 of the disposable portion 104 (one magnetic element 422 being visible in FIG. 36) may also magnetically couple with one or more magnetic elements of the reusable portion 102 (for example, a ferromagnetic portion of the housing 112 or a ferromagnetic component carried in the housing) to hold the disposable portion 104 in the third configuration.

As shown in FIG. 37, the third actuator 700 is energized, and the proximal cylinder 708 rotates relative to the distal cylinder 710 (illustratively, in a counterclockwise direction as viewed from the proximal end 108 of the device 100—shown elsewhere) such that the securing mechanism 132 moves to a fourth configuration. In the fourth configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 37) are disposed in the securing portions 728 of the securing tracks 718 of the proximal cylinder 708 (one securing portion 728 and one securing track 718 being visible in FIG. 37). This inhibits detachment of the disposable portion 104 from the reusable portion 102, and the securing mechanism 132 may remain in the fourth configuration until the therapeutic agent 106 is delivered from the syringe assembly 118 (both shown in FIG. 3).

As shown in FIG. 38, the proximal cylinder 708 then rotates relative to the distal cylinder 710 (in the same direction—illustratively, in the counterclockwise direction as viewed from the proximal end 108) such that the securing mechanism 132 moves to a fifth configuration. In the fifth configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 38) are disposed in the egress portions 730 of the securing tracks 718 of the proximal cylinder 708 (one egress portion 730 and one securing track 718 being visible in FIG. 38). As a result, the proximal cylinder 708 has begun pushing the protrusions 420 and the disposable portion 104 distally to eject the disposable portion 104.

The proximal cylinder 708 further rotates relative to the distal cylinder 710 (in the same direction—illustratively, in the counterclockwise direction as viewed from the proximal end 108) to arrive in a sixth configuration, as shown in FIG. 39. In the sixth configuration, the egress portions 730 of the securing tracks 718 of the proximal cylinder 708 (one egress portion 730 and one securing track 718 being visible in FIG. 39) are aligned with the leading tracks 714 of the distal cylinder 710 (one leading track 714 being visible in FIG. 39). In the sixth configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 38) are disposed in the leading tracks 714 of the distal cylinder 710. The magnetic elements 422 may also magnetically couple with one or more magnetic elements of the reusable portion 102 hold the disposable portion 104 in the sixth configuration, although a user may pull the disposable portion 104 distally to detach the disposable portion 104 from the securing mechanism 132 and the reusable portion 102.

With continued general reference to FIGS. 34-39 and additional reference to FIG. 5, the electronics assembly 134 may cause the securing mechanism 132 and the disposable portion 104 to transition through the above configurations upon detecting one or more conditions. For example, the sensors 140 of the electronics assembly 134 may include a proximity sensor for detecting the position of the disposable portion 104 relative to the reusable portion 102. Such a sensor may be, for example, a magnetic field sensor, such as a Hall effect sensor, for detecting the magnetic elements 422 of the disposable portion 104. Upon detecting that the disposable portion 104 has been inserted into the reusable portion 102 and disposed in the third configuration (FIG. 36), the securing mechanism 132 may transition to the fourth configuration (FIG. 37) to secure the disposable portion 104 to the reusable portion 102. As another example, the sensors 140 of the electronics assembly 134 may include a proximity sensor for detecting the position of the syringe assembly 118, more specifically whether the syringe assembly 118 is in the deployed configuration or the stowed configuration. Upon detecting that the syringe assembly 118 has moved from the deployed configuration to the stowed configuration (that is, the syringe assembly 118 has delivered the therapeutic agent 106 to the patient), the securing mechanism 132 may transition from the fourth configuration (FIG. 37) to the fifth configuration (FIG. 38) and the sixth configuration (FIG. 39) to facilitate detaching the disposable portion 104 from the reusable portion 102. Alternatively, the controller 136 may transition the securing mechanism 132 from the fourth configuration to the fifth configuration and the sixth configuration after a predetermined time period following actuation of the user input 114 (FIG. 3). The predetermined time period may be, for example, based on the typical time period for delivering the therapeutic agent 106 to a patient.

The securing mechanism 132 may be modified in various manners. For example, the securing mechanism 132 could include one or more protrusions, and the disposable portion 104 could include one or more tracks for receiving the protrusions. As another example and referring now to FIGS. 40-46, a securing mechanism 832 according to another exemplary embodiment of the present disclosure is illustrated. The securing mechanism 832 may be used in place of the securing mechanism 132. As such, the securing mechanism 832 would be carried by the housing 112 of the reusable portion 102 (both shown elsewhere). The securing mechanism 832 is generally similar to the securing mechanism 132, and similar features are identified with similar reference numbers.

With specific reference to FIG. 40, the securing mechanism 832 includes a distal cylinder 810 and a proximal cylinder 808 having different leading tracks 814 and securing tracks 818 than those of the distal cylinder 810 and the proximal cylinder 808, respectively. Specifically, the internal surface 812 of the distal cylinder 810 includes three leading tracks 814 (only two leading tracks 814 are visible in FIG. 40), and the internal surface 816 of the proximal cylinder 808 includes three securing tracks 818. Each leading track 814 of the distal cylinder 810 includes an inverted general funnel shape. More specifically, each leading track 814 includes a tapering distal portion 820 and a relatively narrow proximal portion 822. Each distal portion 820 tapers in width proceeding proximally. Each securing track 818 of the proximal cylinder 808 includes a distal portion 820, an entry/egress portion 834, and a securing portion 828. The distal portion 820 of each securing track 818 is selectively alignable with one of the leading tracks 814 to facilitate receiving the protrusions 420 of the disposable portion 104 therefrom. The distal portion 820 of each securing track 818 couples to the entry/egress portion 834. The entry/egress portion 834 of each securing track 818 may extend helically relative to the longitudinal axis A. As such, the entry/egress portion 834 may be referred to as a helical portion. Opposite the distal portion 820, the entry/egress portion 834 of each securing track 818 couples to the securing portion 828. The securing portion 828 may be substantially perpendicular to the longitudinal axis A (that is, perpendicular ±10 degrees). As such, the securing portion 828 may be referred to as a transverse portion. The securing portion 828 terminates opposite the entry/egress portion 834.

Referring to FIGS. 41-46, motion and several configurations of the securing mechanism 832 and the disposable portion 104 are as follows. Although the securing mechanism 832 and the disposable portion 104 may remain in some of the configurations for certain periods of time, other configurations are shown for illustrative purposes, and the securing mechanism 832 and the disposable portion 104 may simply transition through those configurations without remaining in them for a period of time. Although not specifically illustrated, in a first or initial configuration the disposable portion 104 is detached from the securing mechanism 832 and the reusable housing 112 (FIG. 3).

The disposable portion 104 is advanced proximally and toward the securing mechanism 832 to arrive in a second configuration, as shown in FIG. 41. In the second configuration, the housing 400 of the disposable portion 104 is received in the distal cylinder 810 and the proximal cylinder 808. In the second configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 41) have also entered the leading tracks 814 of the distal cylinder 810 (one entire leading track 814 being visible in FIG. 41). In the second configuration, the leading tracks 814 of the distal cylinder 810 are aligned with the distal portions 820 of the securing tracks 818 of the proximal cylinder 808 (one entire securing track 818 being visible in FIG. 41).

The disposable portion 104 is advanced further proximally to arrive in a third configuration, as shown in FIG. 42. In the third configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 42) have moved to the distal portions 820 of the securing tracks 818 of the proximal cylinder 808 (one entire securing track 818 being visible in FIG. 42). The magnetic elements 422 of the disposable portion 104 (four magnetic elements 422 being visible in FIG. 42) may also magnetically couple with one or more magnetic elements of the reusable portion 102 to hold the disposable portion 104 in the third configuration.

As shown in FIG. 43, the proximal cylinder 808 rotates relative to the distal cylinder 810 (illustratively, in a clockwise direction as viewed from the proximal end 108 of the device 100—shown elsewhere) such that the securing mechanism 832 moves to a fourth configuration. In the fourth configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 42) are disposed in the entry/egress portions 834 of the securing tracks 818 of the proximal cylinder 808 (one entire securing track 818 being visible in FIG. 43). As a result, the proximal cylinder 808 has pulled the disposable portion 104 proximally further into the securing mechanism 832.

As shown in FIG. 44, the proximal cylinder 808 further rotates relative to the distal cylinder 810 (in the same direction—illustratively, in the clockwise direction as viewed from the proximal end 108) such that the securing mechanism 832 moves to a fifth configuration. In the fifth configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 44) are disposed in the securing portions 828 of the securing tracks 818 of the proximal cylinder 808 (one securing portion 828 being visible in FIG. 44). This inhibits detachment of the disposable portion 104 from the reusable portion 102, and the securing mechanism 832 may remain in the fifth configuration until the therapeutic agent 106 is delivered from the syringe assembly 118 (both shown in FIG. 3).

As shown in FIG. 45, the proximal cylinder 808 then rotates relative to the distal cylinder 810 (in the opposite direction—illustratively, in the counterclockwise direction as viewed from the proximal end 108) to arrive in a sixth configuration. In the sixth configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 45) are disposed in the entry/egress portions 834 of the securing tracks 818 of the proximal cylinder 808 (one entire securing track 818 being visible in FIG. 45). As a result, the proximal cylinder 808 has begun pushing the protrusions 420 and the disposable portion 104 distally to eject the disposable portion 104.

As shown in FIG. 46, the proximal cylinder 808 further rotates relative to the distal cylinder 810 (in the same direction—illustratively, in the counterclockwise direction as viewed from the proximal end 108) to arrive in a seventh configuration. In the seventh configuration, the protrusions 420 of the disposable portion 104 (one protrusion 420 being visible in FIG. 46) are disposed in the distal portions 820 of the securing tracks 818 of the proximal cylinder 808 (one entire securing track 818 being visible in FIG. 46). In the seventh configuration, the distal portions 820 of the securing tracks 818 are aligned with the leading tracks 814 of the distal cylinder 810 (one entire leading track 814 being visible in FIG. 46). The magnetic elements 422 may also magnetically couple with one or more magnetic elements of the reusable portion 102 hold the disposable portion 104 in the seventh configuration, although a user may pull the disposable portion 104 distally to detach the disposable portion 104 from the securing mechanism 832 and the reusable portion 102.

The electronics assembly 134 (FIG. 5) may cause the securing mechanism 832 and the disposable portion 104 to transition through the above configurations upon detecting one or more conditions in similar manners as described above in connection with the securing mechanism 132.

Although aspects of the disclosure mention a reusable portion and a disposable portion, any aspects disclosed herein could be adopted into a single disposable device. In this example, the first housing and the second housing would be referred to as a housing.

While this invention has been shown and described as having preferred embodiments, the present invention may be modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains.

Various aspects are described in the description in this disclosure, which include, but are not limited to, the following aspects:

1. A therapeutic agent delivery device, comprising: a disposable portion, comprising:

a first housing comprising a distal end; a syringe assembly carried by the first housing, the syringe assembly comprising: a chamber comprising a passageway; a needle in communication with the passageway; the syringe assembly being translatable relative to the first housing from a stowed configuration to a deployed configuration, in the stowed configuration the needle being disposed proximally relative to the distal end of the first housing, and in the deployed configuration the needle at least partially extending distally from the distal end of the first housing; a reusable portion detachably carrying the disposable portion, the reusable portion comprising: a second housing; a drive mechanism carried by the second housing and coupled to the syringe assembly, the drive mechanism comprising: a guide; a rotary actuator; a follower drivably coupled to the rotary actuator and movably coupled to the guide; wherein the rotary actuator is actuatable to rotatably drive the follower, the follower thereby following the guide and translating the drive mechanism relative to the second housing, the drive mechanism thereby translating the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration.

2. The therapeutic agent delivery device of aspect 1, wherein the drive mechanism further comprises a carriage translatably carried by the second housing, the carriage carrying the rotary actuator, and the rotary actuator is actuatable to rotatably drive the follower, the follower thereby following the guide and translating the carriage relative to the second housing, the carriage thereby translating the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration.

3. The therapeutic agent delivery device of aspect 2, wherein the drive mechanism further comprises a compression spring coupled to the follower, the compression spring urging the follower to follow the guide as the rotary actuator rotatably drives the follower, the follower thereby translating the carriage relative to the second housing, and the carriage thereby translating the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration.

4. The therapeutic agent delivery device of aspect 3, wherein the guide comprises a slope portion, and the rotary actuator is actuatable to rotatably drive the follower, the follower thereby following the slope portion and translating the drive mechanism relative to the second housing, the drive mechanism thereby permitting the syringe assembly to translate relative to the first housing and return from the deployed configuration to the stowed configuration.

5. The therapeutic agent delivery device of aspect 4, wherein the compression spring is a first compression spring, the disposable unit further comprises a second compression spring urging the syringe assembly away from the deployed configuration, and the rotary actuator is actuatable to rotatably drive the follower, the follower thereby following the slope portion and translating the drive mechanism relative to the second housing, the drive mechanism thereby permitting the second compression spring to expand and translate the syringe assembly to relative to the first housing and return from the deployed configuration to the stowed configuration.

6. The therapeutic agent delivery device of any one of aspects 2-5, wherein the therapeutic agent delivery device is elongated along a longitudinal axis extending between the disposable portion and the reusable portion, and the rotary actuator is actuatable to rotatably drive the follower, the follower thereby following the guide and translating the carriage relative to the second housing in a drive direction, the drive direction being substantially parallel to the longitudinal axis, the carriage thereby translating the syringe assembly relative to the first housing in the drive direction from the stowed configuration to the deployed configuration.

7. The therapeutic agent delivery device of aspect 6, wherein the follower is rotatable relative to the second housing about a follower rotation axis, the follower rotation axis being substantially parallel to the longitudinal axis, and the rotary actuator is actuatable to rotatably drive the follower about the follower rotation axis, the follower thereby following the guide and translating the carriage relative to the second housing in the drive direction, the carriage thereby translating the syringe assembly relative to the first housing in the drive direction from the stowed configuration to the deployed configuration.

8. The therapeutic agent delivery device of any one of aspects 2-7, wherein the guide comprises a cliff portion having an edge, and the rotary actuator is actuatable to rotatably drive the follower, the follower thereby moving over the edge and translating the drive mechanism relative to the second housing, the drive mechanism thereby translating the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration.

9. The therapeutic agent delivery device of any one of aspects 2-8, wherein the rotary actuator is a first rotary actuator, and the reusable portion further comprises a therapeutic agent delivery mechanism, the therapeutic agent delivery mechanism comprising: a second rotary actuator; a plunger drivably coupled to the second rotary actuator and translatably carried by the carriage; wherein, when the syringe assembly is in the deployed configuration, the second rotary actuator is actuatable to translate the plunger relative to the carriage, the plunger thereby causing the syringe assembly to deliver the therapeutic agent from the needle.

10. The therapeutic agent delivery device of aspect 9, wherein the carriage carries the second rotary actuator, and the second rotary actuator is translatable with the carriage relative to the second housing.

11. The therapeutic agent delivery device of any one of aspects 1-10, wherein the rotary actuator is a first rotary actuator, and the reusable portion further comprises a therapeutic agent delivery mechanism, the therapeutic agent delivery mechanism comprising: a second rotary actuator; a plunger drivably coupled to the second rotary actuator; wherein, when the syringe assembly is in the deployed configuration, the second rotary actuator is actuatable to translate the plunger relative to the first housing, the plunger thereby causing the syringe assembly to deliver the therapeutic agent from the needle.

12. The therapeutic agent delivery device of aspect 11, whereinafter the syringe assembly is in the deployed configuration and the syringe assembly delivers the therapeutic agent from the needle, the syringe assembly returns to the stowed configuration, and then the second rotary actuator is actuated to retract the plunger relative to the first housing.

13. The therapeutic agent delivery device of any one of aspects 1-12, wherein the disposable unit further comprises a compression spring urging the syringe assembly away from the deployed configuration, and (1) the rotary actuator is actuatable in a first instance to rotatably drive the follower, the follower thereby following the guide and translating the drive mechanism relative to the second housing, the drive mechanism thereby translating the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration, and (2) the rotary actuator is actuatable in a second instance to rotatably drive the follower, the follower thereby following the guide, and the compression spring thereby translating the syringe assembly relative to the first housing from the deployed configuration to the stowed configuration.

14. The therapeutic agent delivery device of any one of aspects 1-13, wherein the drive mechanism further comprises a gear train drivably coupling the rotary actuator to the follower.

15. The therapeutic agent delivery device of any one of aspects 1-14, wherein the reusable portion further comprises a user input, the user input carried by the second housing and operatively coupled to the rotary actuator, and the user input being actuatable by a user to actuate the rotary actuator, the rotary actuator thereby rotatably driving the follower, the follower thereby following the guide and translating the drive mechanism relative to the second housing, the drive mechanism thereby translating the syringe assembly relative to the first housing from the stowed configuration to the deployed configuration.

16. The therapeutic agent delivery device of aspect 15, wherein the rotary actuator is a first rotary actuator, and the reusable portion further comprises: a sensor configured to detect disposition of the syringe assembly in the deployed configuration; a therapeutic agent delivery mechanism, the therapeutic agent delivery mechanism comprising: a second rotary actuator; a plunger drivably coupled to the second rotary actuator; wherein, when the sensor detects the syringe assembly is in the deployed configuration, the second rotary actuator is actuated to translate the plunger relative to the first housing, the plunger thereby causing the syringe assembly to deliver the therapeutic agent from the needle.

17. The therapeutic agent delivery device of one of aspects 15-16, wherein the second housing comprises a distal end, in the deployed configuration the needle at least partially extending distally from the distal end of the second housing, the reusable portion further comprising a sensor configured to detect contact between the distal end of the second housing and the skin of a subject, the reusable portion inhibiting actuation of the user input when the sensor does not detect contact between the distal end of the second housing and the skin of the subject, and the reusable portion permitting actuation of the user input when the sensor detects contact between the distal end of the second housing and the skin of the subject.

18. The therapeutic agent delivery device of one of aspects 15-17, wherein the disposable portion further comprises a needle shield detachably coupled to the distal end of the first housing and obscuring the needle in the stowed configuration, the reusable portion further comprising a sensor configured to detect the needle shield, the reusable portion inhibiting actuation of the user input when the sensor detects that the needle shield is coupled to the distal end of the first housing, and the reusable portion permitting actuation of the user input when the sensor detects that the needle shield is detached from the distal end of the first housing.

19. A therapeutic agent delivery device, comprising: a housing; a syringe assembly carried by the housing, the syringe assembly comprising: a chamber comprising a passageway; a piston movably carried in the passageway; a needle in communication with the passageway; a therapeutic agent delivery mechanism carried by the housing, the therapeutic agent delivery mechanism comprising: a carriage movably carried by the housing; a motor carried by the carriage; a gear train drivably coupled to the motor; a drive shaft drivably coupled to the gear train, the drive shaft being rotatable relative to the carriage and translatably fixed relative to the carriage; an outer shaft fixed relative to the carriage, the outer shaft comprising first internal threads; an intermediate shaft disposed within the outer shaft, the intermediate shaft being drivably coupled to the drive shaft and rotatable together with the drive shaft relative to the carriage and the outer shaft, the intermediate shaft comprising first external threads and second internal threads, the first external threads threadably coupling to the first internal threads of the outer shaft; and an inner shaft disposed within the intermediate shaft and engageable with the piston, the inner shaft being translatable relative to the intermediate shaft and rotatably fixed relative to the outer shaft, the inner shaft comprising second external threads, the second external threads threadably coupling to the second internal threads of the intermediate shaft; wherein the motor is actuatable to rotatably drive the gear train, the drive shaft, and the intermediate shaft relative to the carriage, the intermediate shaft thereby rotating and translating relative to the outer shaft, the inner shaft thereby translating relative to the intermediate shaft and translating the piston in the chamber.

20. The therapeutic agent delivery device of aspect 19, wherein the therapeutic agent delivery mechanism further comprises a sleeve, the sleeve rotatably fixing the inner shaft relative to the outer shaft.

21. The therapeutic agent delivery device of aspect 20, wherein one of the inner shaft and the sleeve comprises a key, and the other of the inner shaft and the sleeve comprises a slot, the slot receiving the key to permit translation of the inner shaft relative to the sleeve and rotatably fix the inner shaft relative to the sleeve.

22. The therapeutic agent delivery device of one of aspects 20-21, wherein one of the outer shaft and the sleeve comprises a key, and the other of the outer shaft and the sleeve comprises a slot, the slot receiving the key to permit translation of the outer shaft relative to the sleeve and rotatably fix the outer shaft relative to the sleeve.

23. The therapeutic agent delivery device of any one of aspects 1 and 19, wherein the distal end of the first housing includes a distal end opening, and an interior surface of the first housing includes one or more ribs extending radially inward.

24. The therapeutic agent delivery device of any one of aspects 1-23, wherein the passageway is configured to carry a therapeutic agent.

Claims

1. A therapeutic agent delivery device, comprising: a disposable portion, comprising: a first housing comprising a distal end;a syringe assembly carried by the first housing, the syringe assembly comprising: a chamber comprising a passageway;a needle in communication with the passageway;the syringe assembly being translatable relative to the first housing from a stowed configuration to a deployed configuration, in the stowed configuration the needle being disposed proximally relative to the distal end of the first housing, and in the deployed configuration the needle is at least partially extended distally from the distal end of the first housing;a reusable portion is configured to detachably carry the disposable portion, the reusable portion comprising: a second housing;a drive mechanism carried by the second housing and coupled to the syringe assembly, the drive mechanism comprising: a guide;a rotary actuator;a follower drivably coupled to the rotary actuator and movably coupled to the guide;wherein the rotary actuator is actuatable to rotatably drive the follower, the follower is configured to follow the guide, and whereby the drive mechanism is translated relative to the second housing, and the syringe assembly is translated relative to the first housing from the stowed configuration to the deployed configuration.

2. The therapeutic agent delivery device of claim 1, wherein the drive mechanism further comprises a carriage translatably carried by the second housing, the carriage configured to carry the rotary actuator, and the rotary actuator is actuatable to rotatably drive the follower, the follower is configured to follow the guide and whereby the carriage is translated relative to the second housing, and the syringe assembly is translated relative to the first housing from the stowed configuration to the deployed configuration.

3. The therapeutic agent delivery device of claim 2, wherein the drive mechanism further comprises a compression spring coupled to the follower, the compression spring configured to urge the follower to follow the guide as the follower is rotatably driven by the rotary actuator, whereby the carriage is translated relative to the second housing, and the syringe assembly is translated relative to the first housing from the stowed configuration to the deployed configuration.

4. The therapeutic agent delivery device of claim 3, wherein the guide comprises a slope portion, and the rotary actuator is actuatable to rotatably drive the follower, the follower is configure to follow the slope portion and whereby the drive mechanism is translated relative to the second housing, the drive mechanism thereby permitting the syringe assembly to translate relative to the first housing and return from the deployed configuration to the stowed configuration.

5. The therapeutic agent delivery device of claim 4, wherein the compression spring is a first compression spring, the disposable unit further comprises a second compression spring configured to urge the syringe assembly away from the deployed configuration, and the rotary actuator is actuatable to rotatably drive the follower, the follower is configured to follow the slope portion and whereby the drive mechanism is translated relative to the second housing, the drive mechanism thereby permitting the second compression spring to expand and translate the syringe assembly to relative to the first housing and return from the deployed configuration to the stowed configuration.

6. The therapeutic agent delivery device of claim 2, wherein the therapeutic agent delivery device is elongated along a longitudinal axis extending between the disposable portion and the reusable portion, and the rotary actuator is actuatable to rotatably drive the follower, the follower is configured to follow the guide and whereby the carriage is translated relative to the second housing in a drive direction, the drive direction being substantially parallel to the longitudinal axis, and the syringe assembly is translated relative to the first housing in the drive direction from the stowed configuration to the deployed configuration.

7. The therapeutic agent delivery device of claim 6, wherein the follower is rotatable relative to the second housing about a follower rotation axis, the follower rotation axis being substantially parallel to the longitudinal axis, and the rotary actuator is actuatable to rotatably drive the follower about the follower rotation axis, the follower is configured to follow the guide and whereby the carriage is translated relative to the second housing in the drive direction, and the syringe assembly is translated relative to the first housing in the drive direction from the stowed configuration to the deployed configuration.

8. The therapeutic agent delivery device of claim 2, wherein the guide comprises a cliff portion having an edge, and the rotary actuator is actuatable to rotatably drive the follower, the follower is configured to move over the edge and whereby the drive mechanism is translated relative to the second housing, and the syringe assembly is translated relative to the first housing from the stowed configuration to the deployed configuration.

9. The therapeutic agent delivery device of claim 2, wherein the rotary actuator is a first rotary actuator, and the reusable portion further comprises a therapeutic agent delivery mechanism, the therapeutic agent delivery mechanism comprising: a second rotary actuator;a plunger drivably coupled to the second rotary actuator and translatably carried by the carriage;wherein, when the syringe assembly is in the deployed configuration, the second rotary actuator is actuatable to translate the plunger relative to the carriage, the plunger is configured to cause the syringe assembly to deliver the therapeutic agent from the needle.

10. The therapeutic agent delivery device of claim 9, wherein the carriage carries the second rotary actuator, and the second rotary actuator is translatable with the carriage relative to the second housing.

11. The therapeutic agent delivery device of claim 1, wherein the rotary actuator is a first rotary actuator, and the reusable portion further comprises a therapeutic agent delivery mechanism, the therapeutic agent delivery mechanism comprising: a second rotary actuator;a plunger drivably coupled to the second rotary actuator;wherein, when the syringe assembly is in the deployed configuration, the second rotary actuator is actuatable to translate the plunger relative to the first housing, the plunger is configured to cause the syringe assembly to deliver the therapeutic agent from the needle.

12. The therapeutic agent delivery device of claim 11, whereinafter the syringe assembly is in the deployed configuration and the syringe assembly delivers the therapeutic agent from the needle, the syringe assembly returns to the stowed configuration, and then the second rotary actuator is actuated to retract the plunger relative to the first housing.

13. The therapeutic agent delivery device of claim 1, wherein the disposable unit further comprises a compression spring is configured to urge the syringe assembly away from the deployed configuration, and (1) the rotary actuator is actuatable in a first instance to rotatably drive the follower, the follower is configured to follow the guide and whereby the drive mechanism is translated relative to the second housing, and the syringe assembly is translated relative to the first housing from the stowed configuration to the deployed configuration, and (2) the rotary actuator is actuatable in a second instance to rotatably drive the follower, the follower is configured to follow the guide, and the compression spring is configured to translate the syringe assembly relative to the first housing from the deployed configuration to the stowed configuration.

14. The therapeutic agent delivery device of claim 1, wherein the drive mechanism further comprises a gear train drivably coupling the rotary actuator to the follower.

15. The therapeutic agent delivery device of claim 1, wherein the reusable portion further comprises a user input, the user input carried by the second housing and operatively coupled to the rotary actuator, and the user input being actuatable by a user to actuate the rotary actuator, the follower is rotatably driven by the rotary actuator, the follower is configured to follow the guide and whereby the drive mechanism is translated relative to the second housing, and the syringe assembly is translated relative to the first housing from the stowed configuration to the deployed configuration.

16. The therapeutic agent delivery device of claim 15, wherein the rotary actuator is a first rotary actuator, and the reusable portion further comprises: a sensor configured to detect disposition of the syringe assembly in the deployed configuration;a therapeutic agent delivery mechanism, the therapeutic agent delivery mechanism comprising: a second rotary actuator;a plunger drivably coupled to the second rotary actuator;wherein, when the sensor detects the syringe assembly is in the deployed configuration, the second rotary actuator is actuated to translate the plunger relative to the first housing, the plunger is configured to cause the syringe assembly to deliver the therapeutic agent from the needle.

17. The therapeutic agent delivery device of claim 15, wherein the second housing comprises a distal end, in the deployed configuration the needle is at least partially extended distally from the distal end of the second housing, the reusable portion further comprising a sensor configured to detect contact between the distal end of the second housing and the skin of a subject, the reusable portion is configured to inhibit actuation of the user input when the sensor does not detect contact between the distal end of the second housing and the skin of the subject, and the reusable portion is configured to permit actuation of the user input when the sensor detects contact between the distal end of the second housing and the skin of the subject.

18. The therapeutic agent delivery device of claim 15, wherein the disposable portion further comprises a needle shield detachably coupled to the distal end of the first housing and configured to obscure the needle in the stowed configuration, the reusable portion further comprising a sensor configured to detect the needle shield, the reusable portion configured to inhibit actuation of the user input when the sensor detects that the needle shield is coupled to the distal end of the first housing, and the reusable portion configured to permit actuation of the user input when the sensor detects that the needle shield is detached from the distal end of the first housing.

19. A therapeutic agent delivery device, comprising: a housing;a syringe assembly carried by the housing, the syringe assembly comprising: a chamber comprising a passageway;a piston movably carried in the passageway;a needle in communication with the passageway;a therapeutic agent delivery mechanism carried by the housing, the therapeutic agent delivery mechanism comprising: a carriage movably carried by the housing;a motor carried by the carriage;a gear train drivably coupled to the motor;a drive shaft drivably coupled to the gear train, the drive shaft being rotatable relative to the carriage and translatably fixed relative to the carriage;an outer shaft fixed relative to the carriage, the outer shaft comprising first internal threads;an intermediate shaft disposed within the outer shaft, the intermediate shaft being drivably coupled to the drive shaft and rotatable together with the drive shaft relative to the carriage and the outer shaft, the intermediate shaft comprising first external threads and second internal threads, the first external threads threadably coupling to the first internal threads of the outer shaft; andan inner shaft disposed within the intermediate shaft and engageable with the piston, the inner shaft being translatable relative to the intermediate shaft and rotatably fixed relative to the outer shaft, the inner shaft comprising second external threads, the second external threads threadably coupling to the second internal threads of the intermediate shaft;wherein the motor is actuatable to rotatably drive the gear train, the drive shaft, and the intermediate shaft relative to the carriage, whereby the intermediate shaft is rotated and translated relative to the outer shaft, the inner shaft is translated relative to the intermediate shaft, and the piston is translated in the chamber.

20. The therapeutic agent delivery device of claim 19, wherein the therapeutic agent delivery mechanism further comprises a sleeve, the sleeve rotatably fixing the inner shaft relative to the outer shaft.

21. The therapeutic agent delivery device of claim 20, wherein one of the inner shaft and the sleeve comprises a key, and the other of the inner shaft and the sleeve comprises a slot, the slot is configured to receive the key to permit translation of the inner shaft relative to the sleeve and rotatably fix the inner shaft relative to the sleeve.

22. The therapeutic agent delivery device of claim 20, wherein one of the outer shaft and the sleeve comprises a key, and the other of the outer shaft and the sleeve comprises a slot, the slot is configured to receive the key to permit translation of the outer shaft relative to the sleeve and rotatably fix the outer shaft relative to the sleeve.

23. The therapeutic agent delivery device of claim 1, wherein the distal end of the first housing includes a distal end opening, and an interior surface of the first housing includes one or more ribs extending radially inward.

24. The therapeutic agent delivery device of claim 1, wherein the passageway is configured to carry a therapeutic agent.