The present disclosure generally relates to patient lift assists, and more particularly to an adaptive mobility lift.
Recent medical advances have allowed more patients to survive serious injuries or disease processes than ever before. Unfortunately, the period of bed rest required for recovery often leads to severe deterioration of muscle strength and a corresponding inability of the patient to support full body weight upon standing. It is challenging for rehabilitation specialists to help these patients regain the ability to stand and begin ambulation, and the challenge is especially great for obese patients. A common technique in conventional practice is to summon as many colleagues as practical to lift and maneuver the weakened patient to a standing position while he or she attempts to bear full weight through the lower extremities. This technique is not only dangerous, because of the risk of a fall, but it is also psychologically degrading for the patient as the activity reinforces the patient's dependence on others.
Lifting devices, such as patient lifts used in the healthcare industry may be utilized to move a patient between various positions, such as moving from a bed to a standing position and moving from a sitting position to a standing position. Patient lifts may be equipped with a sling that is coupled to a lifting arm that is utilized to lift the patient. However, conventional patient lifts may move the patient between the various positions by applying a constant or predetermined force to lift the patient, such that the patient moves between the various positions without supporting themselves.
Accordingly, a need exists for alternative adaptive mobility lifts that selectively provide variable force to lift a patient, thereby allowing the patient to progressively support themselves without assistance.
In one embodiment, an adaptive lift includes a base portion including a plurality of rollers, a lift portion coupled to the base portion, the lift portion including a mast extending upward from the base portion in a vertical direction and a lift arm coupled to the mast, a lift bar coupled to the lift arm, a lift system coupled to the base portion and the lift arm, where the lift system raises and lowers the lift bar with respect to the base portion in the vertical direction, a support arm pivotally coupled to the mast and positioned above the base portion in the vertical direction, and a braking system coupled to the support arm, the braking system including a release handle that selectively repositions the braking system between an engaged position, in which the braking system prevents rotation of the plurality of rollers, and a disengaged position, in which the plurality of rollers may rotate.
In another embodiment, an adaptive lift system includes a base portion including a plurality of rollers, a lift portion coupled to the base portion, the lift portion including a mast extending upward from the base portion in a vertical direction and a lift arm coupled to the mast, a lift bar coupled to the lift arm, and a lift system coupled to the base portion and the lift arm, where the lift system raises and lowers the lift bar with respect to the base portion in the vertical direction, the lift system including an electronic controller including a processor and a memory storing computer readable and executable instructions, a motor communicatively coupled to the electronic controller, a linking member engaged with the motor, an integrated scale positioned within the lift bar and communicatively coupled to the electronic controller, and a user input communicatively coupled to the electronic controller.
These and additional features provided by the embodiments described herein will be more fully understood in view of the following detailed description, in conjunction with the drawings.
The embodiments set forth in the drawings are illustrative and exemplary in nature and not intended to limit the subject matter defined by the claims. The following detailed description of the illustrative embodiments can be understood when read in conjunction with the following drawings, where like structure is indicated with like reference numerals and in which:
These and additional features provided by the embodiments described herein will be more fully understood in view of the following detailed description, in conjunction with the drawings.
Reference will now be made in detail to embodiments of adaptive lifts, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts. One embodiment of adaptive lift is depicted in
As used herein, the term “longitudinal direction” refers to the forward-rearward direction of the lift (i.e., in the +/−X-direction as depicted). The term “lateral direction” refers to the cross-direction of the lift (i.e., in the +/−Y-direction as depicted), and is transverse to the longitudinal direction. The term “vertical direction” refers to the upward-downward direction of the lift (i.e., in the +/−Z-direction as depicted).
The phrase “communicatively coupled” is used herein to describe the interconnectivity of various components of the adaptive lift and means that the components are connected either through wires, optical fibers, or wirelessly such that electrical, optical, and/or electromagnetic signals may be exchanged between the components.
Referring now to
The adaptive lift 100 includes at least one weldment 120 that is coupled to the first leg 112 and/or the second leg 114. In particular, the weldment 120 may be coupled to a first outward-facing surface 113 of the first leg 112 and another weldment 120 may be coupled to a second outward-facing surface 115 (
The lift portion 130 includes the mast 132 that is coupled to and extends upward from the base portion 110 in the vertical direction. In particular, the mast 132 is coupled to the first leg 112 and the second leg 114. In the embodiment depicted in
The lift portion 130 includes a pair of support arms 136 that are pivotally coupled to the mast 132. The support arms 136 are positioned above the base portion 110 in the vertical direction and are spaced apart from one another in the lateral direction such that a patient may stand between and grasp onto the support arms 136. The support arms 136 are repositionable between a stowed position (not depicted) and a support position, as shown in
Referring to
In embodiments, the braking system 140 further includes one or more foot pedals 144 coupled to the first leg 112 and/or the second leg 114. The foot pedals 144 are coupled to the plurality of rollers 116 such that the foot pedals 144 selectively apply a force to the plurality of rollers 116 to prevent rotation of the plurality of rollers 116.
The braking system 140 is repositionable between an engaged position and a disengaged position. In particular, a user or patient may grasp the release handle 142 and pull the release handle 142 toward the support arms 136 in direction 22 to reposition the braking system 140 from the engaged position to the disengaged position. In the disengaged position, the plurality of rollers 116 may rotate freely, allowing the adaptive lift 100 to move over a surface, such as a floor. When the user or patient releases the release handle 142, the braking system 140 is repositioned from the disengaged position into the engaged position. In the engaged position, the braking system 140 prevents rotation of the plurality of rollers 116, thereby restricting movement of the adaptive lift 100 across a surface, such as a floor.
Alternatively or in addition to the release handle 142, the foot pedals 144 reposition the braking system 140 into the engaged position. For example, a user such as a rehabilitation specialist, may step on at least one of the foot pedals 144 and rotate the foot pedal or foot pedals 144 in direction 24 to position the braking system 140 into the engaged position, thereby preventing rotation of the rollers 116 and restricting movement of the adaptive lift 100 across a surface, such as a floor. The user may release the foot pedal 144 rotating the foot pedal 144 in direction 26. While direction 24 and direction 26 are depicted as the clockwise direction and the counterclockwise direction, respectively, it should be understood that the foot pedals 144 may move or rotate in any suitable direction to change the braking system 140 between the engaged position and the disengaged position.
In embodiments of the braking system 140 that include both the release handle 142 and the foot pedals 144, the foot pedals 144 may engage the braking system 140 regardless of the position of the release handle 142. In other words, when the user or rehabilitation specialist rotates the foot pedal 144 to engage the braking system 140, the braking system 140 may remain engaged until the user or rehabilitation specialist releases the foot pedal 144, regardless of the position of the release handle 142. In this way, a rehabilitation specialist may engage the braking system 140 to stabilize and control the position of the adaptive lift 100 when assisting a patient between various positions.
The adaptive lift 100 includes the lift arm 134 that is coupled to the mast 132. The lift arm 134 is pivotally coupled to the mast 132 at a lift arm pivot joint 139 such that the lift arm 134 pivots with respect to the mast 132 in direction 20. By pivoting with respect to the mast 132, a lift end 135 of the lift arm 134 may be raised and lowered with respect to the base portion 110 of the adaptive lift 100 in the vertical direction. Additionally, the lift arm 134 may be repositioned between a support position, as depicted in
A lift bar 180 is coupled to the lift end 135 of the lift arm 134. The lift bar 180 is severally coupled to the lift end 135 of the lift arm 134, and may couple a sling 182 to the lift end 135 of the lift arm 134. The sling 182 accommodates a patient and can be utilized to lift and/or support a patient in various activities, for example lifting a patient from a sitting position to a standing position, assisting a patient from a standing position to a sitting position, and assisting a patient walking. In embodiments, the sling 182 includes one or more access holes 186 to accommodate a patient's arms and legs. The sling 182 may further include one or more seams 184 that are connected to the access holes 186, where sling 182 may be selectively separated along the seams 184 to allow a patient to position their arms and/or legs in the access holes 186. In embodiments, the seams 184 may include a variety of fasteners, including but not limited to, zippers, hook and loop straps, buttons, or the like.
The adaptive lift 100 includes a lift system 150 that facilitates movement of the lift bar 180 and the sling 182 with respect to the base portion 110. The lift system 150 includes a motor 152, a linking member 154 coupled to the motor 152, and a driven member 158 that is coupled to both the linking member 154 and the lift arm 134.
The motor 152 includes a motor base 151 that is coupled to the base portion 110 of the adaptive lift 100 and may be positioned between the first leg 112 and the second leg 114. Alternatively or additionally, the motor base 151 may be coupled to the mast 132 of the adaptive lift 100. The motor 152 includes a motor shaft 153 that rotates with respect to the motor base 151. The motor 152 may include an electrical motor, such as an AC motor, DC motor, a reduction gear motor, or the like.
The linking member 154 is coupled to the motor shaft 153 of the motor and extends between the motor 152 and the driven member 158. In the embodiment depicted in
The driven member 158 is coupled to the lift arm 134 such that when the driven member 158 rotates, the driven member 158 causes the lift arm 134 to rotate, for example in direction 20 to lift the lift end 135 of the lift arm 134 with respect to the base portion 110. As described above, the lift bar 180 is severally coupled to the lift arm 134, and accordingly is severally coupled to the lift system 150 through the lift arm 134. As the lift arm 134 rotates, the lift end 135 of the lift arm 134 is raised or lowered with respect to the base portion 110, thereby raising or lowering the lift bar 180 with respect to the base portion 110. Accordingly, through the motor 152, the linking member 154, and the driven member 158, the lift system 150 may selectively raise or lower the lift bar 180 of the adaptive lift 100 with respect to the base portion 110 in the vertical direction.
In embodiments, the motor 152 and/or the driven member 158 may include a one-way ratchet 172 that may selectively prohibit lowering the lift bar 180 in the vertical direction. In particular, when engaged, the one-way ratchet 172 may allow the driven member 158 to rotate in a first direction to raise the lift bar 180 in the vertical direction, but may prohibit the driven member 158 from rotating in a second direction to lower the lift bar 180 in the vertical direction, for example when the adaptive lift 100 is utilized to assist a patient between a sitting position and a standing position, as will be described in greater detail herein.
The lift arm 134 includes a position sensor 170 coupled to the lift arm 134 that detects the position of the lift arm 134 with respect to the mast 132. As the lift bar 180 is coupled to the lift end 135 of the lift arm 134, the position of the lift arm 134 with respect to the mast 132 may be indicative of the position of the lift bar 180 with respect to the base portion 110 in the vertical direction. Alternatively or additionally, the motor 152 may include a position sensor 170 that detects the rotational position of the linking member 154 and/or the motor shaft 153 with respect to the motor base 151. As the lift bar 180 is coupled to the linking member 154 and the motor shaft 153 of the motor 152 through the lift arm 134 and the driven member 158, the rotational position of the linking member 154 and/or the motor shaft 153 may be indicative of the position of the lift bar 180 with respect to the base portion 110 in the vertical direction. In embodiments, the position sensor 170 may include various position detection devices, including, but not limited to, a rotary encoder, a string potentiometer, a linear variable differential transducer (LVDT), a proximity sensor, or the like.
Referring to
The linking member 254 is coupled to the motor shaft 253 of the motor 252 and is directly and severally coupled to the lift bar 180. In embodiments, the linking member 254 is formed from a belt, a strap, a chain or the like. The linking member 254 extends upward from the motor 252, forward of the mast 132 along the lift arm 134, and downward to the lift bar 180. When the motor 252 rotates, the linking member 254 may be paid out from or drawn in to the motor 252, thereby raising or lowering the lift bar 180 with respect to the base portion 110. In the embodiment depicted in
In embodiments, the motor 252 and/or the driven member 258 may include a one-way ratchet 272 that may selectively prohibit lowering the lift bar 180 in the vertical direction. In particular, when engaged, the one-way ratchet 272 may allow the driven member 258 to move in a first direction to raise the lift bar 180 in the vertical direction, but may prohibit the driven member 258 from moving in a second direction to lower the lift bar 180 in the vertical direction, for example when the adaptive lift 100 is utilized to assist a patient between a sitting position and a standing position, as will be described in greater detail herein.
The motor 252 includes a position sensor 270 that detects the position of the linking member 254 and/or the rotational position of the motor shaft 253 with respect to the motor base 251 of the motor 252. As the lift bar 180 is coupled to the linking member 254, the position of the linking member 254 and/or the motor shaft 253 may be indicative of the position of the lift bar 180 with respect to the base portion 110 in the vertical direction. Alternatively or additionally, the lift arm 134 and/or mast 132 may include a position sensor 270 coupled to the lift arm 134 and/or the mast 132 that detects the position of the linking member 254 with respect to the lift arm 134 and/or the mast 132. As the lift bar 180 is coupled to the linking member 254, the position of the linking member 254 with respect to the lift arm 134 and/or the mast 132 may be indicative of the position of the lift bar 180 with respect to the base portion 110 in the vertical direction. In embodiments, the position sensor 270 may include various position detection devices, including, but not limited to, a rotary encoder, a string potentiometer, a linear variable differential transducer (LVDT), a proximity sensor, or the like.
Referring to
A user input 124 is communicatively coupled to the electronic controller 300. The user input 124 includes a device that allows a user to input various parameters into the electronic controller 300 to facilitate operation of the adaptive lift 100. For example, a rehabilitation specialist or other healthcare professional may utilize the user input 124 to communicate the weight of a patient to the electronic controller 300 and a desired level of support to be provided by the motor 152, 252, as will be described in greater detail herein. In embodiments, the user input 124 may include various user input devices, including, but not limited to, graphical user interfaces (GUIs), keyboards, or the like.
The lift bar 180 (
In particular and referring to
Referring to
An acoustic transducer 304 is communicatively coupled to the electronic controller. The acoustic transducer 304 may include an electromechanical element configured to convert electrical energy into mechanical energy such as, but not limited to, a speaker. The electronic controller may cause the acoustic transducer 304 to emit an alert or signal to alert a user that the patient may require additional assistance, as will be described in greater detail herein.
Referring to
Referring to
Referring to
Referring to
At step 702, the electronic controller 300 receives the input mass and desired level of support and executes the computer readable and executable instructions to command the motor 152, 252 to apply torque to the motor shaft 153, 253 which applies a force to the linking member 154, 254 to raise the lift bar 180 upward in the vertical direction. In particular, the motor 152, 252 applies a force to the linking member 154, 254 such that the upward force applied to the lift bar 180 corresponds to the upward force necessary to lift a mass of Z lb, where Z lb corresponds to the input patient mass of X lb multiplied by the desired level of support Y %.
For example, a rehabilitation specialist or healthcare professional may input a patient's mass of 100 lb and a desired level of support of 90% into the user input 124 at step 701. At step 702, the electronic controller 300 then commands the motor 152, 252 to apply torque which applies an upward force to the lift bar 180 that corresponds to the upward force necessary to lift a 90 lb mass (i.e., 100 lb×90%). In some embodiments, the communications module 302 of the adaptive lift may simultaneously command the patient support apparatus 400 to lower in the vertical direction to assist the patient in moving from the sitting position to the standing position.
When the desired level of support is less that 100%, the upward force applied to the lift bar 180 is less that the upward force that is necessary to lift the mass of the patient. Accordingly, in such instances, the lift bar 180 may not move upward when opposed by all of the patient's body weight, such as when the patient is passive. However, as described above, the adaptive lift 100 includes the one-way ratchet 172, 272, which is coupled to the motor 152, 252, and/or the linking member 154, 254. When moving the adaptive lift 100 between the sitting position and the standing position, the one-way ratchet 172 may be engaged such that the one-way ratchet 172 does not allow the lift bar 180 to lower in the vertical direction. In this way, the adaptive lift 100 does not allow the lift bar 180 to lower in the vertical direction, even when the downward force associated with the patient's body weight applied to the lift bar 180 is greater than the upward force applied to the lift bar 180 by the motor 152, 252.
Further, in some embodiments, the position sensor 170, 270 may detect when the lift bar 180 does not move upward in the vertical direction, such as when the patient is passive. When the adaptive lift 100 is moving between the sitting position and the standing position and the lift bar 180 does not move upward, the electronic controller 300 may command the motor 152, 252 to apply force to the linking member 154, 254 such that the lift bar 180 does not lower in the vertical direction. Additionally, the electronic controller 300 may command the communications module 302 and/or the acoustic transducer 304 to emit a signal that the patient may require assistance.
When the patient supports themselves such that the downward force associated with the patient's body weight applied to the lift bar 180 is less than the upward force applied to the lift bar 180 by the motor 152, 252, the lift bar 180 moves upward in the vertical direction. The motor 152, 252 continues to apply force to the linking member 154, 254 and accordingly the lift bar 180 until the patient is positioned in the standing position, as depicted in
In other embodiments, the position sensor 170, 270 may send a signal to the electronic controller 300 indicative of the position of the lift bar 180 in the vertical direction. Once the position sensor 170, 270 detects that the adaptive lift 100 is in the standing position, the electronic controller 300 may command the motor 152, 252 to stop rotating. For example, once the position sensor 170, 270 detects that the lift bar 180 is positioned at the height 32 above the base portion 110 in the vertical direction, the position sensor 170, 270 sends a signal to the electronic controller 300 indicative of the position of the lift bar 180 and the electronic controller 300 commands the motor 152, 252 to stop rotating.
Referring to
Referring to
At step 902, the integrated scale 181 sends a signal to the electronic controller 300 that is indicative of a detected force applied to the lift bar 180, where the detected force applied to the lift bar 180 may be indicative of the downward force applied to the lift bar 180 by the patient as a result of the patient's body weight. If the detected force exceeds the expected force, the electronic controller 300 proceeds to step 903 where the electronic controller 300 commands the motor 152, 252 to apply torque to the motor shaft 153, 253 which applies a force to the linking member 154, 254 to maintain the current position of the lift bar 180.
When the desired level of support is less than 100%, the expected force Z lb is less than the downward force applied to the lift bar 180 under all of the patient's body weight. Accordingly, when the desired level of support is less than 100%, the detected force applied to the lift bar 180 will exceed the expected force Z lb when the patient is passive and applies all of their body weight to the lift bar 180. However, when the patient supports themselves such that the detected force applied to the lift bar 180 is less than the expected force, the electronic controller 300 commands the motor 152, 252 to lower the lift bar 180. In some embodiments, the communications module 302 of the adaptive lift 100 may simultaneously command the patient support apparatus 400 to rise in the vertical direction to assist the patient in moving from the standing position to the sitting position.
In some embodiments, when the adaptive lift 100 is moving between the standing position and the sitting position and the motor 152, 252 applies force to maintain the position of the lift bar 180, the electronic controller 300 may command the communications module 302 and/or the acoustic transducer 304 to emit a signal that the patient may require assistance.
If the detected force does not exceed to the expected force determined at step 901, the electronic controller 300 proceeds to step 904, where the electronic controller 300 commands the motor 152, 252 to lower the lift bar 180 in the vertical direction until the patient is in the sitting position, as shown in
Referring to
Referring to
At step 1102, the integrated scale 181 sends a signal to the electronic controller 300 that is indicative of a detected force applied to the lift bar 180, where the detected force applied to the lift bar 180 may be indicative of the downward force applied to the lift bar 180 by the patient as a result of the patient's body weight. If the detected force exceeds the expected force, the electronic controller 300 proceeds to step 1103 where the electronic controller 300 commands the motor 152, 252 to lower the lift bar 180 by a predetermined interval. In embodiments, the predetermined interval may be less than 6 inches. In other embodiments, the predetermined interval is less than 4 inches. In still other embodiments, the predetermined interval is between 1 inch and 10 inches, inclusive of the endpoints. The electronic controller 300 then proceeds to step 1102 and determines again if the detected force is greater than the expected force.
If the detected force does not exceed to the expected force determined at step 1101, the electronic controller 300 proceeds to step 1104, where the electronic controller 300 commands the motor 152, 252 to lower the lift bar 180 by a predetermined interval. In embodiments, the predetermined interval may be less than 6 inches. In other embodiments, the predetermined interval is less than 4 inches. In still other embodiments, the predetermined interval is between 1 inch and 10 inches, inclusive of the endpoints. The electronic controller 300 then proceeds to step 1102 and determines again if the detected force is greater than the expected force.
In the embodiment depicted in
When the desired level of support is less than 100%, the expected force is less than the downward force applied to the lift bar 180 under all of the patient's body weight. Accordingly, when the desired level of support is less than 100%, the detected force applied to the lift bar 180 will exceed the expected force when the patient applies all of their body weight or more of their body weight to the lift bar 180 than is expected at the desired level of support. In some instances, the patient may apply all of their body weight or more of their body weight to the lift bar 180 than is expected when the lift bar 180 is positioned at a height that prohibits the patient from supporting themselves. In other words, when the lift bar 180 is positioned too high for a particular patient to support themselves, the patient may apply downward force to the lift bar 180 that exceeds the expected force Z lb. By lowering the lift bar 180 by the predetermined interval when the detected force exceeds the expected force, the adaptive lift 100 may lower the lift bar 180 by the predetermined interval such that the patient can adequately support themselves while walking.
Conversely, when the detected force applied to the lift bar 180 is less than the expected force, the lift bar 180 may be positioned too low to adequately support the patient at the desired level of support. Accordingly, by raising the lift bar 180 by the predetermined interval when the detected force applied to the lift bar 180 is less than the expected force, the adaptive lift 100 may raise the lift bar 180 such that the adaptive lift 100 may provide support at the desired support level.
In embodiments, the distance that the adaptive lift 100 may lower or raise the lift bar 180 in the vertical direction while assisting a patient in walking may be restricted to a defined range, for example based on the patient's height and the shape of the sling 182 (
In some embodiments, the defined range of the vertical position of the lift bar 180 while the adaptive lift 100 is assisting a patient walking may be based directly on an individual patient's height. For example, a user may input the patient's height into the user input 124, and the lift bar 180 may not be positioned lower than the patient's height in the vertical direction. In some embodiments, the lift bar 180 may not be positioned lower than the patient's height in the vertical direction and may not be positioned higher than 24 inches above the patient's height in the vertical direction.
It should now be understood adaptive lifts according to the present disclosure include a braking systems that selectively stabilizes the adaptive lift. In some embodiments, the adaptive lifts include lift systems including an integrated scale communicatively coupled to an electronic controller, in which the integrated scale communicates a detected of force a patient is applying to the adaptive lift. A user, such as a rehabilitation specialist may set a desired level of support provided by the adaptive lift. Using the detected force and the desired level of support, the adaptive lift may assist a patient through certain movements, including moving from a sitting position to a standing position, moving from a standing position to a sitting position, and walking. As the patient regains strength, the rehabilitation specialist may successively reduce the desired level of support, decreasing patient reliance on the adaptive lift.
It is noted that the terms “substantially” and “about” may be utilized herein to represent the inherent degree of uncertainty that may be attributed to any quantitative comparison, value, measurement, or other representation. These terms are also utilized herein to represent the degree by which a quantitative representation may vary from a stated reference without resulting in a change in the basic function of the subject matter at issue.
While particular embodiments have been illustrated and described herein, it should be understood that various other changes and modifications may be made without departing from the spirit and scope of the claimed subject matter. Moreover, although various aspects of the claimed subject matter have been described herein, such aspects need not be utilized in combination. It is therefore intended that the appended claims cover all such changes and modifications that are within the scope of the claimed subject matter.
This application claims the benefit of priority under 35 U.S.C. § 119 to U.S. Provisional Application Ser. No. 62/161,954, filed May 15, 2015, and entitled “Adaptive Mobility Lift” the entire disclosure of which is incorporated by reference.
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