United States Patent 19
`Arkans
`
`(11)
`45)
`
`4,396,010
`Aug. 2, 1983
`
`54 SEQUENTIAL COMPRESSION DEVICE
`75 Inventor: Edward J. Arkans, Hoffman Estates,
`Ill.
`73 Assignee: The Kendall Company, Walpole,
`Mass.
`21 Appl. No.: 164,137
`22 Filed:
`Jun. 30, 1980
`(51) Int. Cl. ............................................... A61H 1/00
`52 U.S.C. ................................. 128/24 R; 128/24.1;
`128/40
`58) Field of Search ...................... 128/24 R, 64, 24.1,
`128/38-40; 137/102, 487.5
`References Cited
`U.S. PATENT DOCUMENTS
`3,527,207 8/1970 Gottfried .......................... 128/24 R
`3,896,794 7/1975 McGrath .......................... 128/24 R
`4,030,488 6/1977 Hasty ................................ 128/24 R
`4,077,402 3/1978 Benjamin .......................... 128/24 R
`
`(56)
`
`4,255,480 3/1981 Kessel ................................. 137/102
`4,321,929 3/1982 Lemelson et al. .................. 128/630
`Primary Examiner-Richard J. Apley
`Assistant Examiner-George Yanulis
`Attorney, Agent, or Firm-James W. Potthast
`57
`ABSTRACT
`A pressure generating device for applying compressive
`pressures from a compressor against a patient's limb
`through means of a flexible, pressurizable sleeve which
`encloses the limb having an overpressure circuit which
`causes venting of the pressurizable sleeve and termina
`tion of power to the compressor in the event of the
`pressure assuming an excessive value. The sleeve has a
`ventilation chamber and a controller which generates
`electrical signals to actuate a solenoid controlled valve
`to periodically connect the compressor to the ventila
`tion chamber during cooling cycles.
`
`11 Claims, 4 Drawing Figures
`
`
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 1
`
`

`

`U.S. Patent Aug. 2, 1983
`
`Sheet 1 of 3
`
`4,396,010
`
`
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 2
`
`

`

`U.S. Patent
`
`Aug. 2, 1983
`
`Sheet 2 of 3
`
`4,396,010
`
`
`
`
`
`ZPP
`
`0.000
`
`99
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 3
`
`

`

`U.S. Patent Aug. 2, 1983
`
`Sheet 3 of 3
`
`4,396,010
`
`
`
`se
`
`252
`
`260
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 4
`
`

`

`1.
`
`SEQUENTIAL COMPRESSION DEVICE
`
`10
`
`15
`
`BACKGROUND OF THE INVENTION
`The present invention relates to a device for applying
`compressive pressures against a patient's limb through
`means of a compression sleeve enclosing the limb, and,
`more particularly, to a circuit for preventing the appli
`cation of excessive pressure and to control the applica
`tion of pressure to a ventilation chamber of the sleeve.
`Compression sleeves and devices for controlling
`them are well known and illustrated in the patent art
`such as U.S. Pat. Nos. 4,013,069 of Hasty; 4,030,488 of
`Hasty; 4,091,804 of Hasty; 4,029,087 of Dye et al.;
`3,942,518 of Tenteris et al.; and 2,145,932 of Israel, and
`reference may be had thereto for general background
`information of structure and utility.
`Briefly, flexible compressive sleeves having a plural
`ity of pressure compartments are wrapped around the
`limb of a patient and are then intermittently pressurized
`to sucessively apply pressure compression to different
`parts of the limb.
`One potential problem with such devices is that due
`to malfunction the pressure can become so great as to
`discomfort or even injure the patient. Accordingly, in
`known devices such as those shown in the above pa
`tents, pressure release valves have been provided to
`prevent such occurrence. The release valves, however,
`tend to be relatively slow acting and do not function to
`terminate power to the compressor or other pressure
`SOTCe.
`In U.S. Pat. No. 4,091,804, a sleeve is disclosed which
`is provided with a ventilation chamber having openings
`which face inwardly toward the patient's limb to inject
`air between the limb and the sleeve to ventilate or cool
`the limb. A need therefore exists for means to control
`the application of pressure to the ventilation chamber in
`coordination with the application of power to the pres
`sure chamber.
`Known controllers have been constructed from flu
`idic or pneumatic controls. While such types of controls
`function in an acceptable manner, they are subject to
`mechanical wear and other deterioration.
`SUMMARY OF THE INVENTION
`The proposed object of the present invention is the
`provision of a pressure generating device for applying
`compressive forces against a patient's limb through
`means of a flexible compression sleeve having a pres
`sure release device with a pressure sensor and means
`responsive to the pressure sensor sensing an excessive
`pressure to depressurize the sleeve.
`In keeping with this object, upon sensing an excessive
`55
`pressure, a pressure switch actuates an overpressure
`circuit to both disable a control from periodically ap
`plying pressure to the sleeve and to terminate the appli
`cation of electrical power to a compressor which
`supplies the pressure. The overpressure circuit has a
`memory which causes the disablement of power termi
`nation to continue after the pressure has decreased
`below the excessive pressure. An indicator light notifies
`the operator of the disablement.
`Another object is to provide a single control for con
`65
`trolling the application of pressure to both the sleeve
`pressure chambers and the ventilation chamber. In the
`preferred embodiment an electronic controller controls
`
`4,396,010
`2
`solenoid controlled valves to selectively connect the
`various chambers to the pressure source.
`Yet another objective is to provide a pulse generator
`which is substantially electrical and electronic to avoid
`the problems of mechanical wear.
`Further objectives, features and advantages will be
`come more apparent from a reading of the following
`description of the preferred embodiment and the claims.
`DESCRIPTION OF THE DRAWINGS
`In the drawings:
`FIG. 1 is a perspective view of the sequential com
`pression device as being used to apply compressive
`forces and ventilation to the legs of a patient;
`FIG. 2 is a schematic diagram, partially in block
`form, showing the preferred embodiment of the pulse
`generator portion of the device;
`FIG. 3 is a comparative timing diagram of the electri
`cal pulses and corresponding resultant pressure pulses
`generated by the pressure generator of FIG. 2; and
`FIG. 4 is a schematic diagram of the electronic con
`troller shown in FIG. 2.
`DESCRIPTION OF THE PREFERRED
`EMBODIMENT
`Referring now to FIG. 1, the sequential compression
`device 10 is seen as being used to apply compressive
`pressures and cooling to the legs 12 of a patient 14. The
`device 10 includes a sequential pressure generator 16
`mounted within a case 18. Generator 16, sequentially
`generates the pressure pulses illustrated in FIG. 3, at
`output ports 20A, 20B, 20O and 20D, respectively.
`These pressure pulses at output ports 20A-20D are
`respectively connected through flexible tubes 22A, 22B,
`22C and 22D to input ports 24A, 24B, 24C and 24D of
`a manifold 26. The manifold 26 is of the type shown and
`described in U.S. Pat. Nos. 4,013,069 and 4,030,488 of
`Hasty and has two sets of four identical output ports
`(not shown). The four output ports of each set are asso
`ciated and are in fluid communication with the input
`ports 24A-24D. The two sets of output ports are respec
`tively connected to a pair of compression sleeves 28 by
`a pair of flexible sets of tubes 30.
`The pair of compression sleeves 28 are identical to
`each other. Each one is wrapped around one of the
`patient's legs 12 and has three pairs of contiguous pres
`sure chambers 32A, 32B and 32C, arranged longitudi
`nally along the length of the sleeve. In addition to
`chambers 32A-32C, each of sleeve 28 has one or more
`ventilation chambers 32D with a plurality of inwardly
`forcing openings for ventilating the patient's leg 12. The
`sleeves are of the type shown in U.S. Pat. Nos.
`4,091,804; 4,013,069; 4,030,488 and 4,207,876 of Hasty,
`and reference may be had thereto for a more detailed
`description of the compression sleeves 28.
`Each of chambers 32A are connected in fluid commu
`nication with input port 24A through a pair of flexible
`tubes 30 and manifold 26. Each of the pair of chambers
`32B and 32C are likewise connected in fluid communi
`cation with input ports 24B and 24C of manifold 26. The
`ventilation chambers 32D are connected through one of
`flexible tubes 30 and manifold 26 to input port 24D.
`Referring now also to FIG. 3, the pressure pulse
`generator 16 functions to repetitively generate pulses on
`its output ports 20A-20D in the time sequence shown
`by the wave forms of FIG. 3. As can be seen in FIG. 3,
`the first pulse A commences at time TA and is applied
`to the pair of ankle chambers 32A at the lower extrem
`
`20
`
`25
`
`30
`
`35
`
`45
`
`50
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 5
`
`

`

`10
`
`15
`
`45
`
`20
`
`4,396,010
`3
`4.
`ity of legs 12 in the manner described above. Then,
`controlled valves 54A-54C are connected to pneumatic
`commencement of a pulse B is generated at output port
`connection 86 through suitable flow control valves
`20B at a later time TB and applied to calf chambers 32B.
`88A, 88B and 88C respectively. The cooling solenoid
`At yet a later time TC, commencement of a pulse C on
`control valve 54D, on the other hand, is connected
`output port 20O begins which is applied to the thigh
`directly to pneumatic connection 86 through a suitable
`chambers 32C. Finally, at a later time TD when pulses
`pneumatic connection 90.
`A, B and C terminate, the cooling pulse D is generated
`The electronic controller 52 generates electronic
`on output port 20D and applied to ventilation chambers
`pulses on its four outputs 92A,92B, 92C and 94D which
`32D. At the end of cooling pulse D, a new pulse A is
`correspond to pressure pulses A, B, C and D, respec
`generated and the sequence repeats.
`tively. All of these solenoid controlled valves 54A-54D
`Referring again to FIG. 1, the pressure generator 16
`are identical, and each comprises a solenoid coil 94 and
`is seen to include mounted to case 18, various controls
`a two-way valve 96. Each of the valves has an input 98
`and indicators. First, a pressure meter 34 is provided to
`connected to pneumatic connection 86 and compressor
`indicate the pressure applied to a pair of ankle chambers
`50, an output 100 connected to the associated one of
`32A. An indicator light 36 is provided which lights
`pressure output ports 20A-20D, and a venting output
`when no pressure is being generated. A knurled, rotary
`102 which is open to the atmosphere. When the coil 94
`knob 38 provides a means for manually adjusting the
`is energized, the valve switches to a state in which the
`pressure. Another knurled, rotary knob 40 provides
`presure at its input 90 is coupled to its output 100 and
`means for adjusting the cooling or ventilation pressure
`thus to the associated output port 20A-20D. When the
`and thus the amount of cooling air flow being provided.
`coil is not energized, the valve vents the output 100 to
`atmosphere through venting output 102 and closes the
`Three indicator lights 42A, 42B and 42C located at
`appropriate ankle, calf or knee, and thigh positions on a
`connection between compressor 50 and the associated
`leg form located on the outside of case 18 respectively
`output port 20A-20D.
`light when pressure pulses A, B and C are generated. A
`Thus, whenever the electronic controller 52 gener
`fourth indicator light 44 lights when ventilation pres
`ates an output signal on one of its outputs 92A-92D to
`25
`sure pulse D is generated. Finally, a rocker switch 46 is
`energize the solenoid controlled valve coil 94 con
`provided to manually turn power to the pressure gener
`nected therewith, a pressure pulse is applied to the asso
`ator on and off. A light (not shown in FIG. 1), located
`ciated output port 20A-20D. Conversely, when the
`behind, but visible through, switch 46 lights when
`electronic controller 52 does not generate an output to
`power is turned on.
`energize one of the coils, the solenoid controlled valve
`30
`Referring now to FIG. 2, the structure and operation
`96 associated therewith vents the output port to venting
`of the sequential pressure generator 16 will be described
`output 102.
`in greater detail. Dash lines are used to indicate pneu
`One of the particularly advantageous features of the
`present invention is the provision of the safety pressure
`matic connections, while solid lines indicate electrical
`connections. Principally, the sequential pressure gener
`release circuitry. As previously explained, if the pres
`35
`ator comprises a DC power supply 48 and related cir
`sure becomes too great, the patient can suffer discom
`cuitry; a compressor 50; an electronic controller 52
`fort and even injury. The pressure at the output port
`(shown in greater detail in FIG. 4); four solenoid con
`20A is monitored by the pressure actuated switch 56.
`trolled valves 54A, 54B, 54C and 54D, respectively
`Switch 56 is connected to the pressure output port 20A
`associated with pressure pulses A, B, C and D; and a
`through a pneumatic connection 104, a pressure filter
`40
`safety pressure release circuit comprising a pressure
`106, and another pneumatic connection 108. Pressure
`switch 56, an RS flip-flop 58, a transistor 60, and a relay
`filter 106 comprises a fitting with an orifice of suffi
`ciently small dimension, so that the pressure appearing
`switch 62.
`on output 108 follows only the average pressure applied
`The DC power supply 48 may be of conventional
`form having two inputs 64 and 65 connectable to a
`to the input from pneumatic connection 104 and not the
`suitable source of AC power (not shown) through an
`transient pressure pulses. Another output of pressure
`AC power plug 66 and producing two DC voltages VB,
`filter 106 is connected to the pressure gauge 34 through
`a pneumatic connection 110.
`such as 24 volts DC, and VC, such as +5 volts DC, on
`When the pressure produced at output port 20A ex
`two outputs 68 and 70. AC input 64 is connected di
`rectly to plug 66 through lead 72. Input 65, on the other
`ceeds a preselected value, the pressure switch 56, which
`50
`hand, is connected to plug 66 through a thermal cutout
`is normally open as shown, switches to a closed position
`switch 72, a fuse 74, a neon light, power-on, indicator
`to connect ground reference to reset input 112 of RS
`76, a resistor 78, the power switch 46 and another fuse
`flip-flop 58. This causes the flip-flop 58 to reset to a state
`80. The DC voltages VB and VC are used to power the
`in which a positive voltage pulse or 1-state signal is
`produced on its inverting output 114 and a ground volt
`electronics in electronic controller 52 and voltage VC is
`also used to power the RS flip-flop 58.
`age or 0-state signal is produced on its normal output
`116. The no-pressure light 36, which comprises a light
`The compressor 50, which includes an electronic
`compressor motor, is connected to the AC power plug
`emitting diode, is connected between supply voltage
`66 to receive AC power therefrom through a lead 82 at
`VC and output 116 and is energized and lights when
`one side thereof and through a lead 84, relay switch 62,
`inverting output 114 switches to the 0-state. More im
`power on-off switch 46 and fuse 80 at the other side
`portantly, inverting output if4 is connected to the base
`thereof. A fan 85 for cooling the motor and other elec
`of NPN transistor 60, and when the 1-state signal is
`tronics is connected in parallel with compressor 50. The
`applied to the base, the transistor 60 turns on to energize
`compressor 50 provides a single source of pressure for
`relay coil 117 causing relay switch 62 to switch from its
`all of the pressure pulses A-D.
`normally closed condition, as shown, to an open condi
`The pressure tank of compressor 50 is connected to
`tion. A free wheeling diode 118 is connected in parallel
`with relay coil 17. When switch 62 opens, AC power
`each of the solenoid controlled valves 54A-54D
`through a pneumatic connection 86. The three solenoid
`is disconnected from compressor 50, so that no further
`
`55
`
`65
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 6
`
`

`

`10
`
`4,396,010
`5
`6
`pressure increases are allowed. In addition to the com
`common input is input Vc, shown only on timers 134
`pressor 50 being turned off, the 0-state signal on normal
`and 136. As seen, these two inputs are connected to
`output 116 is coupled through inverters 120 and 122 to
`ground through filter capacitors 148 and 150, respec
`an input 124 of electronic controller 52. As will be
`tively. These inputs can be used to control the threshold
`explained with reference to FIG. 4, this 0-state signal at
`voltage that the voltage signal applied to control input
`input 124 causes the electronic controller to terminate
`C must reach to cause the end of the timing period. The
`all signals on its outputs 92A-92D to de-energize all
`capacitor connections to ground merely function to
`solenoid coils 94 of solenoid control valves 54A-54D.
`prevent the inputs from responding to noise and other
`This causes all of the controlled valves to switch to
`transients.
`their venting position to deflate the compression sleeves
`Each of timers 126, 132, 134 and 136 have variable
`28.
`time control circuits 152, 154, 156 and 158 connected
`Referring now to FIG. 4, the electronic controller 52
`thereto. Each comprises a fixed resistor 160, a variable
`is seen to comprise six electronic timers 126, 128, 130,
`resistor 162, and a capacitor 164 connected in series
`132, 134 and 136; four AND gates 138A, 138B, 138C
`between supply voltage VC and ground. The junction
`and 138D, respectively associated with pulses A, B, C
`between the variable resistor 162 and the capacitor 164
`15
`and D; an antilatch circuit 140; and a startup circuit 142.
`is connected to the control input C. By varying the
`The timers generate signals on their various outputs
`value of resistor 162, the time duration of the output
`which are coupled to AND gates 138A-138D to gener
`pulse produced on output 0 of each of these timers may
`ate electronic pulses that cause generation of corre
`be varied accordingly for reasons set forth below. Tim
`sponding pressure pulses. The antilatch circuit triggers
`ers 128 and 130, on the other hand, have two, identical,
`20
`one of the timers to start a timing sequence in the event
`fixed, time control circuits 166 and 168 connected
`circumstances causing none of AND gates 138A-138D
`thereto, respectively. Each of these time control cir
`generating 1-state signals on their outputs. The startup
`cuits comprise a resistor 170 and capacitor 172 con
`circuit 142 functions to energize solenoid coil 94 of
`nected in series between ground and supply voltage
`solenoid controlled valve 54C upon turn-on of power to
`VC. The junction between the resistor 170 and capaci
`25
`reduce the load on the compressor motor upon power
`tor 172 is connected to control input C and the relative
`turn-on to minimize transients.
`values of the rsistor and capacitor determine the time
`period of these timers.
`The six timers are contained in two identical inte
`grated circuit packages, preferably quad timers 558/559
`The antilatch circuit has an SCR 176 with its cathode
`manufactured by Signetics and described at page 155 of
`connected to a resistor 178 to supply voltage VC and its
`30
`Signetics Data Manual, published 1976 by Signetics
`anode connected through another resistor 180 to
`Corporation. Reference may be had to such Signetics
`ground. The junction between the anode and resistor
`publication, but briefly, each timer comprises a mono
`180 is AC coupled through a capacitor 182 and lead 184
`stable multivibrator, or one-shot, circuit having three
`to trigger input Toftiming circuit 134. The gate of SCR
`principal inputs: a trigger input T which responds to
`176 is connected to the junction of two resistors 186 and
`35
`negative voltage transistors, a control input C which
`188 which are connected in series between supply volt
`age VC and ground. Thus, a positive signal is normally
`determines the period of the timer, and an output 0.
`When the trigger input of each timer is provided with a
`applied to the gate of SCR 176 to keep it in a conductive
`negative transient signal, its output assumes a 1-state
`State.
`and remains in that 1-state for a preselected period of
`Also connected to the cathode of SCR 176 is an NPN
`40
`transistor 190. A turn-on delay capacitor 192 is con
`time determined by a timing control circuit connected
`to control input C.
`nected between the collector transistor 190 and ground,
`At the end of the timing period, the output returns to
`and the emitter of transistor 190 is connected directly to
`a 0-state. Timers 126, 128 and 130 are contained within
`ground. The base of transistor 190 is connected to the
`one of the integrated circuit packages, and timers 132,
`45 junction between two resistors 194 and 196 which form
`a voltage divider coupled between ground and the out
`134 and 136 are contained in another identical circuit
`package. Each circuit package also has four common
`put of a diode OR gate 198. OR gate 198 is formed from
`inputs for each of the timers contained in the package.
`four diodes having their cathodes commonly connected
`These common inputs are shown as being connected to
`together to resistor 196 and their anodes respectively
`only some of the timers, but it should be understood that
`connected to the outputs of AND gates 138A, 138B,
`50
`such inputs are in fact internally connected to each of
`138C and 138D. At power turn-on or in the event of any
`the timers of the package. These common inputs include
`other circumstances causing all of the outputs from
`inputs G and V, shown only on timers 126 and 132,
`timers 126, 128, 130 and 134 to be in a 0-state simulta
`respectively connected to ground and supply voltage
`neously, a 0-state signal is applied at the output 200 of
`VC. Filter capacitors 144 and 146 are connected be
`diode OR gate 198. This causes transistor 190 to turn off
`55
`tween these two inputs of the two packages, respec
`to raise anode voltage of SCR 176 to turn it on and raise
`tively, to minimize adverse noise effects. Another input
`its cathode voltage. As a result, a positive pulse appears
`common to both packages is a reset input R, shown only
`on trigger input T of timer 134 through capacitor 182.
`The negative going trailing edge of this pulse triggers
`on timers 126, and 132. Whenever a 0-state signal is
`applied to the R input of the package, the outputs 0 of
`timer 134 to a 1-state and starts the timing period.
`60
`Presuming this to be the case, application of the nega
`all timers of that package revert to a 0-state. These two
`reset inputs R are connected to output 124, described
`tive transistor signal to input T of timer 134 will cause
`capacitor 164 to discharge and after the period of timer
`above in reference to FIG. 2, so that all timers are reset
`with their outputs in a 0-state upon closure of pressure
`134 is passed, the signal on its output 0 will switch to a
`switch 56. As will be made apparent hereinafter, this
`65
`0-state. While other times may be selected, in the pre
`causes all of the solenoid coils 94 to be de-energized to
`ferred embodiment the time period for timer 134 is 60
`cause the solenoid controlled valves 96 to switch their
`seconds. The time periods for timers 126, 128, 130, 132
`outputs 100 to venting output 102. The last remaining
`and 136 are preferably 11 seconds, 15.5 seconds, 15.5
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 7
`
`

`

`5
`
`15
`
`10
`
`4,396,010
`7
`8
`seconds, 2.5 seconds and 5.5 seconds. The timers nor
`shown and described. Referring to circuit 262, it is seen
`mally have a 0-state output. When a trigger pulse is
`to comprise a transistor 270 having its emitter con
`applied to the trigger input T of any one of the timers,
`nected to ground and its collector connected to a load
`its output will switch to a 1-state and remain in that state
`resistor 272, a diode 274 and the light emitting diode
`until expiration of its associated timing period. Each of
`42A to supply voltage VC. In addition, the solenoid coil
`the outputs 0 of the timers has a pull-up resistor 174
`94 is connected between the supply voltage VB and the
`through which it is connected to supply voltage VC.
`collector transistor 270. A diode 276 is connected in
`The pull-up resistors 174 allow the outputs to rise in this
`parallel with solenoid coil 94. Consequently, when the
`1-state during this time.
`11-second pulse is produced on output 216 of AND gate
`After 60 seconds the output of timer 134 will switch
`138A, transistor 270 turns on to cause light emitting
`to a 0-state. The negative transition of this output is
`diode 42A to light and to energize solenoid coil 94
`coupled through a lead 202 to the trigger input of timer
`which switches valve 96 of solenoid controlled valve
`126 which causes its output to switch to a 1-state and to
`54A to connect compressor 50 to pressure outlet port
`remain in that state for 11 seconds. The output of timer
`20A. At the end of the 1-state pulse, transistor 270 turns
`126 is coupled through a lead 204, a resistor 206, and a
`off which causes the valve to switch to its venting posi
`lead 208 to the trigger input T of timer 134, and at the
`tion and causes light emitting diode 42A to turn off.
`end of the 11-second period when the output of the
`Circuits 264, 266 and 268 contain the light emitting
`timer 126 switches back to a 0-state, timer 134 is trig
`diodes 42B, 42C and 44, respectively, and the solenoid
`gered back into a 1-state where it remains for another 60
`coils 94 of solenoid control valve 54B, 54C and 54D,
`seconds.
`respectively. During the 8.5 second pulse produced on
`20
`The 1-state signal on output 0 of timer 126 is coupled
`the output 237 of AND gate 138B, light emitting diode
`through another lead 210 to both inputs 212 and 214 of
`42B is lit as ventilating pressure is applied to pressure
`AND gate 138A. AND gate 138A in response to that
`outlet port 20D. Likewise, during the pulses produced
`condition, produces a 1-state signal on its output 216
`on the outputs of AND gates. 138C and 138D, light
`corresponding to pulse A and lasting for 11 seconds.
`emitting diodes 42C and 44 are lit and pressure pulses
`25
`The negative transition on the output of timer 134 at
`are produced on outlet ports 200 and 20D, respectively.
`the beginning of the 11-second pulse is coupled through
`To prevent transients which might cause fuses to
`a lead 218 and a lead 220 to the trigger input T of timer
`blow and undesirable surges in the compressor motor
`136. It is also coupled through lead 218 and a lead 222
`during initial application of power, power turn-on cir
`and 224 to the trigger input of timer 132. Thus, at the
`30
`cuit 142 functions to energize the solenoid coil 94 of
`beginning of the 11-second pulse, a 2.5 second 1-state
`solenoid controlled valve 54B. This enables the com
`pulse is produced on the output of timer 132 and a 5.5
`pressor motor to work against at least one open valve.
`1-state pulse is produced on the output of timer 136. The
`The circuit 142 comprises a transistor 278 with its col
`outputs of timers 132 and 136 are respectively coupled
`lector connected to supply voltage VB through a resis
`to the trigger inputs T of timers 128 and 130 through
`tor 280 and with its emitter directly connected to the
`35
`leads 220, 226 and 228, respectively. Thus, at the end of
`switching transistor circuit 64 (not shown) through a
`the 2.5 second pulse, a 15.5 second 1-state pulse is pro
`lead 282. The base of transistor 278 is connected to the
`duced on the output of timer 128, and after 5.5 seconds
`junction between a pair of resistors 284 and 288 which
`a 15.5 second 1-state pulse is produced on the output of
`are connected in series with a capacitor 290 between the
`timer 130.
`emitter and supply voltage VC. Normally, transistor
`40
`The output of timer 128 is coupled through a lead 230
`278 is in a nonconductive state and has no effect on the .
`and a lead 232 to an input 234 of AND gate 138B. The
`rest of the circuitry. However, when power is first
`other input 236 of AND gate 138B is coupled to the
`applied, a positive pulse is coupled through capacitor
`output of timer 126 through lead 210. Thus, AND gate
`290 to the base of transistor 278, temporarily turning it
`138B produces a 1-state pulse which commences 2.5
`on which in turn temporarily turns on the switching
`45
`transistor of 264 to open its associated valve.
`seconds after commencement of the 11-second 1-state
`pulse on the output of 138A which lasts 8.5 seconds (11
`As can be appreciated, because of the variable resis
`seconds minus 2.5 seconds) and ends concurrently with
`tors 162 associated with the time period control circuits
`the termination of the 11-second pulse.
`152, 154, 156 and 158 the duration of each of pulses A,
`The output of timer 130 is coupled through a lead 238
`B, C and D may be selectively varied to meet the needs
`50
`to an input 240 of AND gate 138C. The other input 242
`of the patient or other circumstances. The pulse dura
`of AND gate 138C is coupled through a lead 210 to the
`tion of each of these pulses may be changed indepen
`output of timer 126. Thus, AND gate 138C produces a
`dently without changing the duration of the other
`1-state pulse on its output 244 commencing 5.5 seconds
`pulses. The duration of pulse A is completely deter
`after commencement of the 11-second pulse, having a
`mined by time period control circuit 152. Likewise, the
`55
`duration of 6.5 seconds and ending concurrently with
`duration of pulse D is completely controlled by the time
`the 11-second pulse.
`period control circuit 156. While the maximum duration
`Both inputs 246 and 248 are coupled through a lead
`of pulses B and C is determined by the duration of pulse
`250, lead 222 and lead 218 to the output of timer 134.
`A, otherwise, pulses B and C are completely controlled
`Accordingly, AND gate 138D produces a 1-state signal
`by time period control circuits 154 and 158, respec
`60
`tively.
`on its output 252 having a 60-second duration coinci
`dent with the output pulse produced on the output of
`The foregoing detailed description is given for clear
`timer 134.
`ness of understanding only, and no unnecessary limita
`AND gate output 216, 237, 244 and 252 are respec
`tions should be understood therefrom, as modifications
`tively connected through resistors 254, 256,258 and 260
`65
`will be obvious to those skilled in the art.
`to output circuits 262, 264, 266 and 268, respectively.
`I claim:
`1. A pressure generating device having a source of
`All of these circuits are identical with one another, and
`for the sake of brevity, only the output circuit 262 is
`pressurized fluid for applying compressive forces
`
`Sleep Number Corp.
`EXHIBIT 2089
`IPR2019-00514
`Page 8
`
`

`

`4,396,010
`9
`O
`against a patient's limb through means of a flexible
`5. The pressure generating device of claims 1 in
`sleeve which encloses the limb and has at least one
`which said valve is either completely closed or com
`pletely open.
`pressure chamber connectable with the source, in
`which the improvement comprises:
`6. The pressure generating device of claim 1 includ
`means for sensing the pressure in the pressure cham
`ing means for providing an alarm indication in response
`to said pressure sensing means sensing said selected
`ber, said pressure sensing means including an elec
`excessive pressure.
`trical pressure transducer for generating an electri
`7. The pressure generating device of claim 1 in which
`cal signal in response to said chamber pressure
`said source of pressurized fluid comprises a compressor
`exceeding a preselected value; and
`driven by a motor and said chamber depressurizing
`means responsive to said electrical signal for depres
`means includes means responsive to said pressure sens
`surizing the chamber, said depressurizing means
`including
`ing means to terminate power to said motor when the
`pressure exceeds the preselected excessive value.
`a valve connected with the source and connectable
`8. The pressure generating device of claim 7 in which
`with the pressure chamber, said valve having one
`power terminating means comprises a normally closed
`position in which the source is connected to the
`switch connected between the motor and a source of
`chamber and a venting position in which the source
`electrical power.
`is not connected to the chamber and the chamber
`9. The pressure generating device of claim 1 in which
`vents to a low pressure drain, such as atmo