The present disclosure relates to a mattress overlay used in connection with a mattress of a patient support apparatus and particularly, to a control unit that controls pneumatic functions of the mattress overlay. More particularly, the present disclosure relates to internal components of the control unit for the mattress overlay which have multiple settings for inflating and deflating portions of the mattress overlay.
An apparatus, system, or method may comprise one or more of the features recited in the appended claims and/or the following features which, alone or in any combination, may comprise patentable subject matter:
A mattress overlay apparatus for use with a mattress may include an overlay configured for placement atop the mattress that may have a plurality of inflatable bladders. The plurality of inflatable bladders may be pneumatically coupled to a blower. A first and second rotary plate valves may be pneumatically coupled to the plurality of bladders and the blower. The rotary plate valves may be arranged in series between the plurality of bladders and the blower.
In some embodiments, the blower has an inlet and an outlet. The first rotary valve may include a first rotary plate that may be movable between a first position and a second position. When the first rotary plate is in the first position, the inlet of the blower may be coupled to atmosphere and the outlet of blower may be coupled to the second rotary plate valve so that positive pressure produced at the outlet of the blower may be applied to the second rotary plate valve. When the first rotary plate is in the second position, the outlet of the blower may be coupled to atmosphere and the inlet of the blower may be coupled to the second rotary plate valve so that negative pressure produced at the inlet of the blower may be applied to the second rotary plate valve.
In some embodiments, the second rotary plate valve may include a second rotary plate that may be movable between first, second, third, and fourth positions. The plurality of inflatable bladders may include at least one percussion and vibration (P&V) bladder, a left turn bladder, a right turn bladder, and a microclimate management (MCM) envelope. When the second rotary plate is in the first position and the first rotary plate is in the first position, the blower may be operable to inflate the at least one P&V bladder. When the second rotary plate is in the second position and the first rotary plate is in the first position, the blower may be operable to inflate the left turn bladder. When the second rotary plate is in the third position and the first rotary plate is in the first position, the blower may be operable to inflate the right turn bladder. When the second rotary plate is in the fourth position and the first rotary plate is in the first position, the blower may be operable to move air through the MCM envelope.
In some embodiments, when the second rotary plate is in the first position and the first rotary plate is in the second position, the blower may be operable to deflate the at least one P&V bladder. When the second rotary plate is in the second position and the first rotary plate is in the second position, the blower may be operable to deflate the left turn bladder. When the second rotary plate is in the third position and the first rotary plate is in the second position, the blower may be operable to deflate the right turn bladder.
In some embodiments, the plurality of bladders may include at least one percussion and vibration (P&V) bladder. The first rotary plate valve may have a first rotary plate and the second rotary plate valve may have a second rotary plate. When the second rotary plate of the second rotary plate valve is in a P&V position, the first rotary plate may be oscillated between a first position in which positive pressure at an outlet of the blower may be applied to the at least one P&V bladder to inflate the at least one P&V bladder and a second position in which negative pressure at an inlet of the blower may be applied to the at least one P&V bladder to deflate the at least one P&V bladder.
In some embodiments, a frequency at which the first rotary plate oscillates between the first and second positions may be from about 5 Hertz to about 20 Hertz. The mattress overlay apparatus may include a conduit through which the second rotary plate valve pneumatically communicates with the at least one P&V bladder. The conduit may include a tube made of cloth-like, flexible material and a quantity of 3-dimensional (3D) engineered material within the tube that may prevent the tube from collapsing.
The mattress overlay apparatus may include a housing in which the blower, the first rotary plate valve, and the second rotary plate valve may be contained. The second rotary plate valve may have a set of four output ports accessible at an exterior of the housing. The mattress overlay apparatus may include a hose assembly that may have four hoses and a hose adapter that may attach to the housing so that the four hoses may substantially simultaneously couple to the set of four output ports of the second rotary plate valve. In some embodiments, the plurality of inflatable bladders may include at least one percussion and vibration (P&V) bladder that may be pneumatically coupled to a first hose of the set of four hoses, a left turn bladder that may be pneumatically coupled to a second hose of the set of four hoses, a right turn bladder that may be pneumatically coupled to a third hose of the set of four hoses, and a microclimate management (MCM) envelope that may be pneumatically coupled to a fourth hose of the set of four hoses.
In some embodiments, the first hose may be strengthened with a coil of wire due to the blower being operated to inflate the at least one P&V bladder at a higher pressure than may be used to inflate the left turn bladder, the right turn bladder, and the MCM envelope. For example, the pressure applied by the blower to P&V bladders via the first hose may be about 70 to about 80 cmH2O at a high intensity setting. The pressure applied by the blower to the left and right turn bladders via the second and third hoses, respectively, may be about 30 to about 40 cmH2O. The pressure applied by the blower to the MCM envelope via the fourth hose may be about 20 to about 30 cmH2O.
A graphical user interface (GUI) may be accessible on the housing in some embodiment. The graphical user interface may display a first touch button that may be selected to activate a percussion and vibration (P&V) function of the overlay, a second touch button that may be selected to activate a left turn assist function of the overlay, a third touch button that may be selected to activate a right turn assist function of the overlay, and a fourth touch button that may be selected to activate a microclimate management (MCM) function of the overlay.
The GUI may display an off button that may be selected to turn off whichever of the P&V function, left turn assist function, right turn assist function, and MCM function is being operated. Alternatively or additionally, sequential presses of each of the first, second, third, and fourth buttons turns the associated function on, then off, then on, then off, etc. Operation of each of the P&V function, left turn assist function, right turn assist function, and MCM function may be mutually exclusive such that only one of the P&V function, left turn assist function, right turn assist function, and MCM function may be able to be operated at any given time.
In some embodiments, the first rotary plate valve may have a first rotary plate that may be moved by a first stepper motor and the second rotary plate valve may have a second rotary plate that may be moved by a second stepper motor. A first axis of rotation of the first rotary plate may be substantially perpendicular to a second axis of rotation of the second rotary plate, but other arrangements in which the first and second axes are not substantially perpendicular are within the scope of the present disclosure.
The second rotary plate valve may have a plurality of outlet ports and a rotary plate with a hole that may be selectively alignable with each outlet port of the plurality of outlet ports. The second rotary plate valve may have a plurality of cup seals that may be spring biased against the rotary plate. The rotary plate may include a bar that may extend across the hole thereby to separate the hole into two hole portions. The bar may prevent seal herniation of the cup seals as the rotary plate is rotated. Each cup seal of the plurality of cup seals may be aligned with a respective outlet port of the plurality of outlet ports. Optionally, at least a portion of the bar extending across the hole may be curved.
In some embodiments, the mattress overlay apparatus may further include straps that may be coupled to the overlay and sized to extend under the mattress to retain the overlay on the mattress. The mattress overlay apparatus may further include a plurality of hoses that may extend between the second rotary plate valve and the plurality of bladders and further may include a plurality of hose straps that may retain portions of the plurality of hoses along at least one side or a least one end of the mattress or both. Each hose strap of the plurality of hose straps may be constructed so as to define multiple loops, for example, though which respective hoses of the plurality of hoses may be routed. If desired, the overlay may include side and end flaps that may cover the hose straps and the portions of the plurality of hoses retained by the hose straps.
In some embodiments, the plurality of inflatable bladders may include a set of percussion and vibration (P&V) bladders that may be formed by coupling together a first layer of material of the overlay and a second layer of material of the overlay such that the P&V bladders may extend laterally across a majority of a width of the overlay and such that conduits through which air may be delivered to the P&V bladders may be defined between the first and second layers along opposite longitudinal sides of the overlay. Alternatively, the conduits may all be situated along a same longitudinal side of the overlay.
In some contemplated embodiments, the mattress overlay apparatus may further include a vital signs sensor that may be integrated into the overlay. Such a vital signs sensor may be configured to measure heart rate and respiration rate. The vital signs sensor may include a capacitive sensor, for example. The vital signs sensor may be configured to sense patient presence on the overlay and/or patient absence from the overlay.
The plurality of inflatable bladders may include at least one percussion and vibration (P&V) bladder, a left turn bladder, a right turn bladder, and a microclimate management (MCM) envelope. The blower may be operated in an open loop manner at a respective set speed when inflating the at least one P&V bladder and pressurizing the MCM envelope. The blower may be operated in a closed loop manner when inflating the left and right turn bladders. In this regard, the mattress overlay apparatus may further include at least one pressure sensor that may sense a pressure that may be output to the left and right turn bladders. The pressure sensed by the pressure sensor may be used in connection with the closed loop control of the blower. Patient weight and desired time to complete inflation of the left and right turn bladders also may be used in connection with the closed loop control of the blower. The set speed of operation of the blower to inflate the at least one P&V bladder may be different than the set speed of operation of the blower to pressurize the MCM envelope.
The plurality of inflatable bladders may include at least one percussion and vibration (P&V) bladder and the overlay may include a pocket beneath the at least one P&V bladder for insertion of an auxiliary support surface when the at least one P&V bladder is in use to enhance rigidity of the overlay beneath the at least one P&V bladder. The auxiliary support surface may include a separately inflated intermediate bladder, for example. Alternatively or additionally, the auxiliary support surface may include a substantially rigid plate. The pocket may be configured to receive a chest X-ray plate therein. In some embodiments, the pocket may be accessible through an opening at a side of the overlay. If desired, a zipper may be coupled to the overlay and may be configured to open and close the opening.
In some embodiments, an upper layer of the overlay may include foam. The foam may be situated within the MCM envelope. Thus, the foam may have sufficient porosity for airflow therethough. Alternatively or additionally, an upper layer of the overlay may include a microclimate management (MCM) envelope that may contain 3-dimensional (3D) engineered material therein.
According to another aspect of the present disclosure, a mattress overlay apparatus for use with a mattress may be provided and may include an overlay that may be configured for placement atop the mattress. The overlay may have at least one percussion and vibration (P&V) bladder, a left turn bladder, a right turn bladder, and a microclimate management (MCM) envelope. An air source may be included in the apparatus and may have an inlet and an outlet. A two-position valve may be coupled to the inlet and the outlet of the air source. The two-position valve may have a first position and a second position. A four-position valve may be coupled to the two-position valve and may have first, second, third, and fourth positions. The at least one P&V bladder may be inflated by air from the air source when the two-position valve is in its first position and the four-position valve is in its first position. The at least one P&V bladder may be deflated by the air source when the two-position valve is in its second position and the four-position valve is in its first position. The left turn bladder may be inflated by air from the air source when the two-position valve is in its first position and the four-position valve is in its second position. The left turn bladder may be deflated by the air source when the two-position valve is in its second position and the four-position valve is in its second position. The right turn bladder may be inflated by air from the air source when the two-position valve is in its first position and the four-position valve is in its third position. The right turn bladder may be deflated by the air source when the two-position valve is in its second position and the four-position valve is in its third position. The MCM envelope may be pressurized by air from the air source when the two-position valve is in its first position and the four-position valve is in its fourth position.
In some embodiments, the two-position valve may include a first rotary plate and the four-position valve may include a second rotary plate. The first rotary plate may have four air passage holes and the second rotary plate may have one air passage hole with a bar extending thereacross to define two air passage hole portions. The four-position valve may have a plurality of cup seals that may be spring biased against the second rotary plate. The bar may prevent seal herniation of the cup seals as the second rotary plate is rotated. Optionally, at least a portion of the bar may be curved. Alternatively or additionally, at least a portion of the bar may be substantially straight.
In some embodiments, a first axis of rotation of the first rotary plate may be substantially perpendicular to a second axis of rotation of the second rotary plate. The two-position valve may include a first stepper motor that may operate to rotate the first rotary plate and the four-position valve may include a second stepper motor that may operate to rotate the second rotary plate.
Inflation of each of the at least one P&V bladder, the left turn assist bladder, and the right turn assist bladder and the pressurization of the MCM envelope may be mutually exclusive such that only one of a P&V function, a right turn assist function, a left turn assist function, and an MCM function may be able to be operated at any given time. The air source may include a blower, for example. Alternatively or additionally, the air source may include a pump, a compressor, a pressurized reservoir, a gas supply system of a health care facility, and so forth.
According to a further aspect of the present disclosure, a valve apparatus may include a valve body, a rotary plate that may be coupled to the valve body for rotation, and a seal that may be in contact with the rotary plate. The rotary plate may have a hole formed therethough and an anti-herniation appendage may be situated in the hole. The anti-herniation appendage may prevent herniation of the seal as the rotary plate rotates the hole across at least a portion of the seal.
In some embodiments, the seal may comprise an annular seal. If desired, a spring may be arranged to bias the annular seal against the rotary plate. For example, the spring may include a coil spring that may be compressed between the annular seal and a portion of the valve body. Optionally, the annular seal may include a cup seal.
In some embodiments, the anti-herniation appendage may include a bar that may extend across the hole to define two hole portions. At least a portion of the bar is curved in some embodiments. Alternatively or additionally, at least a portion of the bar may be substantially straight. A stepper motor may be coupled to the valve body and may be operable to rotate the rotary plate. The valve body may include a main body that may having a cylindrical chamber in which the rotary plate may be situated and a cover that may attach to the main body. Optionally, the cover may have a cylindrical projection that may extend into the cylindrical chamber of the main body.
Additional features, which alone or in combination with any other feature(s), such as those listed above and those listed in the claims, may comprise patentable subject matter and will become apparent to those skilled in the art upon consideration of the following detailed description of various embodiments exemplifying the best mode of carrying out the embodiments as presently perceived.
The detailed description particularly refers to the accompanying figures in which:
and
A patient support apparatus, such as illustrative hospital bed 10, includes a patient support structure such as a frame 34 that supports a mattress 66 covered by a mattress overlay 32 as shown in
Illustrative hospital bed 10 has a frame 34 which includes an upper frame assembly 35, a base 36, and a lift system 39 coupling upper frame assembly 35 to base 36 as shown in
Illustrative hospital bed 10 has four siderail assemblies coupled to upper frame assembly 35 as shown in
Referring now to
A P&V button 18a initiates a P&V therapy using the P&V bladders 68a-c (shown in
An MCM button 18d initiates microclimate management via delivery of air to the microclimate management envelope 74 (shown in
In some embodiments, envelope 74 has openings to atmosphere at its head end such that the pressurized air flows beneath the upper layer of envelope 74 to the openings at the head end of envelope 74. Alternatively or additionally, the upper layer of envelope 74 has a multitude of small perforations (e.g., ⅛th inch or less) through which air escapes from MCM envelope 74 and moves upwardly toward and around the patient. MCM is employed to reduce the moisture and/or heat between the patient and the upper surface of the overlay 32. MCM envelope 74 is sometimes referred to herein as MCM bladder 74 or just bladder 74 even though, in many contemplated embodiments, MCM bladder 74 permits air to escape to atmosphere therethrough.
In some embodiments, MCM envelope 74 comprises an upper layer of the overlay 32 and includes foam therein. Thus, the foam is situated between upper and lower sheets of material that define the MCM envelope 74. It should be appreciated that the foam has sufficient porosity for airflow therethough if the foam fills the MCM envelope 74. Alternatively or additionally, MCM envelope 74 that may contain a 3-dimensional (3D) engineered material therein and air from control unit 12 flows through the 3D engineered material.
In the illustrative embodiment, turn assist bladders 70, 72 have their respective long dimensions oriented generally parallel with a long dimension of overlay 32. Bladders 70, 72 each extend roughly from a normal-sized patient's head region to their knees when the patient is lying in a standard, supine position on overlay 32. P&V bladders 68a-c have their long dimensions oriented generally parallel with a lateral dimension of overlay 32. Thus, P&V bladders 68a-c are generally perpendicular to turn assist bladders 70, 72. Opposite ends of P&V bladders 68a-c extend beyond opposite outside edges of bladders 70, 72 such that each of bladders 68a-c extends nearly the full width of overlay 32. P&V bladders 68a-c extend over the top surface of bladders 70, 72 and are located so as to underlie the properly oriented supine patient's torso or chest region. Thus, head end portions of bladders 70, 72 extend beyond P&V bladder 68a toward the head end of overlay 32 and foot end portions of bladders 70, 72 extend beyond P&V bladder 68c toward the foot end of overlay 32 as shown best in
A hose assembly 30, shown in
Referring now to
In the illustrative example, hose assembly 30 includes a set of hoses 59a-59d and a sleeve 58 that covers the hoses 59a-59d. When hose adapter 28 is mechanically coupled to hose port 22 of housing 14, hoses 59a-59d of hose assembly 30 are pneumatically coupled to respective tube ports 64a-64d. Thus, tube ports 64a-64d align with the hoses 59a-59d of the hose assembly 30. A diagrammatic arrow 62 in
Hose 59b is pneumatically coupled to the P&V bladders 68a-c. In the illustrative example, a coiled wire 60 is included in hose 59b to strengthen hose 59b so that hose 59b is better able to withstand the higher pressures that control unit 12 applies to P&V bladders 68 as compared to the pressures applied by control unit 12 to bladders 70, 72 through hoses 59a, 59c, respectively, and to MCM envelope 74 through hose 59d. For example, in some embodiments, the pressure applied by control unit 12 to P&V bladders 68 via hose 59b is about 70 to about 80 cmH2O at a high intensity setting; the pressure applied by control unit 12 to bladders 70, 72 via hoses 59a, 58c, respectively, is about 30 to about 40 cmH2O; and the pressure applied by control unit 12 to MCM envelope via hose 59d is about 20 to about 30 cmH2O.
Based on the above description, it should be appreciated that each of tube ports 64a-64d is allocated to direct air from control unit 12 to P&V bladders 68a-c, to turn assist bladder 70, to turn assist bladder 72 or to the MCM envelope 74 via the associated hose 59a-59d of hose assembly 30. Thus, in the illustrative embodiment, port 64a is allocated to the P&V bladders 68a-c, port 64b is allocated to the right turn assist bladder 70, port 64c is allocated to to the left turn assist bladder 72, and port 64d is allocated to the MCM envelope 74. As will be discussed in further detail below, the illustrative control unit 12 is configured to control only one of the P&V, right turn, left turn, or MCM functions of mattress overlay 32 at a time.
Referring to
In each of
A stepper motor 90 is coupled to a back surface of block 83 and an output of shaft of stepper motor 90 turns a rotary plate inside passage 82 of block 83 as will be described in further detail below in connection with
The first rotary valve 78 includes a rotary plate 104 sandwiched between a first manifold shell 94 and a second manifold shell 96. Shells 94, 96 couple together to form a manifold that contains rotary plate 104 therein. An inlet 93 of blower 92 pneumatically couples to a first passage (not shown) of shell 94 and an outlet 95 of blower 92 pneumatically couples to a second passage (not shown) of shell 94. A first passageway 98a of shell 96 pneumatically couples to passageway 86 of second rotary valve 76 and a second passageway 98b of shell 96 is pneumatically coupled to atmosphere. A stepper motor 100 is mounted to shell 96 and has an output shaft which turns rotary plate 104 within manifold 94, 96 of valve 78. Plate 104 has a four openings 102a, 102b, 102c, 102d therein in the illustrative example.
Depending upon the position of plate 104, the inlet 93 of blower is pneumatically coupled to one of passageways 98a, 98b and the outlet 95 of blower 92 is coupled to the other of passageways 98a, 98b. In particular, in a first position of plate 104 shown in
In the first position of plate 104, air from the ambient is drawn into passageway 98b of valve 98, moved through blower 92, and then the air pressurized from blower 92 is moved through valve 78 and expelled through passageway 98a into chamber 82 of block 83 of valve 76 through passageway 86. The pressurized air from blower 92 received in chamber 82 of valve 76 is ultimately directed to either bladders 68a-c, bladder 70, bladder 72, or MCM envelope 74 depending upon the state of valve 76 as dictated by the position of the rotary plate therein. In the second position of plate 104, air from overlay 32 is drawn through valve 76 into passageway 98a of valve 78 and is then drawn into inlet 93 of blower 92 where it is expelled from the outlet 95 of blower 92, though valve 78, and then to the ambient through passageway 98b. Additional details of rotary valve 78 and the accompanying blower 92 and stepper motor 100 is shown in
Referring once again to
Referring to
It should be appreciated that during activation and deactivation of the right turn assist function using left turn bladder 72, blower 92 and valve 98 are operated the same as just described above in connection with the left turn assist function. However, the rotary plate of valve 76 is moved to the second position so that air exits and enters chamber 82 of valve 76 through tube 64b rather than tube 64a. Of course, tube 64a is pneumatically coupled to left bladder 72 via hose 30 whereas tube 64a is coupled to right bladder 70. Otherwise the description above regarding the inflation and deflation of bladder 70 is equally applicable to the inflation and deflation of bladder 72.
Referring now to
Referring to
Referring to
In some embodiments, blower 92 is operated in an open loop manner at a respective set speed when inflating P&V bladders 68a-c and pressurizing MCM envelope 74. In contrast, blower 92 is operated in a closed loop manner when inflating the left and right turn bladders 70, 72. In this regard, mattress overlay apparatus 10 includes at least one pressure sensor (see sensor 226 in
As is apparent in
In the illustrative embodiment of
Still referring to
In some contemplated embodiments such as the one shown in
In some embodiments, overlay 32 has a pocket beneath P&V bladder 68a-c for insertion of an auxiliary support surface when P&V bladders 68a-c are in use. The auxiliary support surface enhances rigidity of the overlay 32 beneath P&V bladders 68a-c, thereby to enhance the effectiveness of the P&V function to loosen and/or dislodge mucus from the patient's lungs. The auxiliary support surface comprises a separately inflated intermediate bladder, for example. Alternatively or additionally, the auxiliary support surface may include a substantially rigid plate. In some embodiments, the pocket that receives the auxiliary support surface is also configured to receive a chest X-ray plate therein. Optionally, the pocket is accessible through an opening at a side of the overlay 32. If desired, a zipper may be coupled to the overlay 32 and may be configured to open and close the opening.
Referring now to
Referring now to
Referring to
Referring to
In the illustrative embodiment, hose 30 is pneumatically coupled to the manifold 134 which is, in turn, attached to the P&V bladders 68a-c on the left side. In other embodiments, the hose 30 may be on the right side of P&V bladders 68a-c. In
Referring to
Referring now to
Referring now to
Referring to
Referring again to
Referring to
Referring now to
Flange 162 of cover 85 has four holes 166 to receive screws 84 to couple cover 85 to main block 83. The circular portion 161 of the cover 85 has a groove 163 that receives an O-ring 165. The O-ring 165 is made of a rubber or elastic material to provide sealing engagement between portion 161 of cover 85 and the inner surface of chamber 82. Thus, ring 165 provides a seal to prevent air from leaking from valve 76 during operation of the control unit 12. The tubular holes 164a-164d correspond to particular tubes 64a-64d so that air may be directed to the plurality of P&V bladders 68a-c, turn assist bladder 70, turn assist bladder 72 or MCM envelope 74.
The rotatable plate 170 includes a hole 172 to allow for air flow through the rotatable plate 170 and a raised portion 176 that has a square hole 178 to receive a square block 180 to provide torque to the rotatable plate 170 from the first stepper motor 90. Rotary plate 170 includes a bar 174 across hole 172 to prevent cup seals 168a-168d sandwiched between the cover 85 and the rotatable plate 170 from herniating when the hole 172 is moved across the cup seals 168a-168d. Bar 174 bifurcates or separates hole 172 into two hole portions with each hole portion being on one side of bar 174 or the other. Springs 88a-88d bias the respective cup seals 168a-168d into engagement with the rotatable plate 170. The bar 174 comprises a curved piece across the hole 172 in the illustrative embodiment. Alternatively or additionally, the bar 174 may include straight portions. Bar 174, therefore, serves as an anti-herniation appendage situated in hole 172. In the illustrative embodiment, bar 174 extends all the way across 172.
The main block 83 includes four holes 192 that align with holes 166 of the first stationary plate 160 that receive the screws 84 to couple the cover 85 and the main block 83 together. The main block 83 includes an opening 194 to receive the passageway 86 therein. The passageway 86 couples the first rotary valve 78 to the second rotary valve 76 as described above. The main block 83 includes four holes 196 that receive suitable fasteners, such as bolts or screws 186, to couple the first stepper motor 90 to main block 83. The main block 83 also includes an opening 198 to receive an output shaft 200 of the first stepper motor 90. The first stepper motor 90 includes holes 202 to align with the holes 196 of the main block 83. Screws 186 are received in holes 196 of main block 83 and holes 202 of the first stepper motor 90.
The cover 85 and the rotatable plate 170 have springs 88a-88d compressed therebetween and in engagement with cup seals 168a-168d that align with the holes 164a-164d and the tubes 64a-64d. Thus, springs 88a-88d are compressed between cover 85 and the respective cup seal 168a-168d, each of which is, in turn, biased against rotary plate 170. The hole 172 of plate 170 rotates with the output shaft 200 to be positioned in alignment with one of the holes 164a-164d to allow airflow to the respective tube 64a-d which are, in turn, pneumatically coupled to respective bladders 68a-c, 70, 72 or MCM envelope 74.
A thrust bearing 182 is situated between the rotatable plate 170 and the main block 83 and helps to maintain the square portion 180 within the hole 178. A shaft seal 184 attaches to a distal end of the output shaft 200 and abuts the thrust bearing 182. The thrust bearing 182 abuts the square block 180. The first stepper motor 90 rotates the rotatable plate 170 through the output shaft 200 and the square block 180 received in the hole 178 of the rotatable plate 170. As shown in
Referring now to
An alternating current (AC) power cord 216 is also coupled to circuitry 210. Circuitry 210, therefore, includes components to convert the incoming AC power to the proper voltage levels, e.g., 5 Volts (V), 12 V, 24 V, etc., required by various components of systems 76,78, 92, 204. In some embodiments, control unit 12 includes a lithium ion battery pack which is charged while power cord 216 is plugged into a power outlet. In some such embodiments, the components of control unit 12 are powered from the lithium ion battery pack regardless of whether cord 216 is plugged into a power outlet. Battery packs or batteries that operate according to technologies other than lithium ion technology are also within the scope of this disclosure for use in control unit 12.
It should be appreciated that although circuitry 210 is shown diagrammatically as a single block in
In
Still referring to
One or more sensors 226 are placed in pneumatic communication with any of the passageways 98a, 98b, 64, hose 30, and manifold 134 and are in electrical communication with control circuitry 210 via suitable conductors. Thus, one could allocate sensor(s) 226 as being a component of either electrical system 204 or pneumatic system 76, 78, 92 or both. The one or more sensors 226 may further be placed in pneumatic communication with other components such as the blower 92. Sensor(s) 226 include a pressure sensor or a flow sensor or both. Suitable electrical conductors also interconnect blower 92, first stepper motor 90, and second stepper motor 100 to circuitry 210. In general, conductors communicate control signals from circuitry 210 to blower 92, first stepper motor 90, second stepper motor 100 and communicate feedback signals from blower 92, first stepper motor 90, and second stepper motor 100 to circuitry 210.
Examples of feedback signals from blower 92 include rotational speed of an impeller of the blower 92 and the temperature of the blower 92. The control signal to the blower 92 may include, for example, a voltage signal such as a pulse width modulated (PWM) signal. Examples of feedback signals from one of the stepper motors 90, 100 include a step count number indicative of a position of an output shaft of one of the motors 90, 100 and a temperature of one of the motors 90,100. The control signal to one of the motors 90, 100 may include, for example, a voltage pulse to move the motor output shaft by one step or a series of pulses to move the motor output shaft by a corresponding number of steps.
When positive pressure produced at an outlet of blower 92, defined by a an opening 102a of valve 78, is to be supplied to the plurality of bladders 68, 70, 72 or MCM envelope 74, valve 78 is operated so that pressurized air from blower 92 is communicated to one of the plurality of bladders 68, 70, 72 or MCM envelope 74. When negative pressure produced at inlet 93 of the blower 92, defined by opening 102b, is to be supplied to the plurality of bladders 68, 70, 72 or MCM envelope 74, valve 78 is operated so that suction from blower 92 is communicated from passageway 98a to withdraw air from the plurality of bladders 68, 70, 72 or the MCM envelope 74.
According to this disclosure, valve 78 is also operable while in the positive pressure position and/or the negative pressure position to produce oscillations in the pressure being delivered to P&V bladders 68. It is contemplated by this disclosure that, in some embodiments, only the second stepper motor 100 is used in control unit 12 to control whether valve 94 is in the positive pressure position or the negative pressure position and to control whether the valve 94 produces oscillations while in either of these positions.
Although certain illustrative embodiments have been described in detail above, many embodiments, variations and modifications are possible that are still within the scope and spirit of this disclosure as described herein and as defined in the following claims.
The present application is a continuation of U.S. application Ser. No. 15/935,837, filed Mar. 26, 2018, now U.S. Pat. No. 10,856,668, which claims the benefit, under 35 U.S.C. § 119(e), of U.S. Provisional Application No. 62/483,636, filed Apr. 10, 2017, each of which is hereby incorporated by reference herein in its entirety.
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