Abstract
A device and method coupled to a therapy garment to apply pressure and repetitive compression forces to a body of a person has a positive air pulse generator and a user programmable time, frequency and pressure controller operable to regulate the duration of operation, frequency of the air pulses and a selected air pressure applied to the body of a person. The air pulse generator has rigid displacers that are angularly moved with power transmission assemblies to draw air into the air pulse generator and discharge air pressure pulses to the therapy garment.
Claims
1. An apparatus for applying pressure and high frequency pressure pulses to the thorax of a person, comprising: an air pulse generator having user programmable controls; a garment adapted to be located on the thorax of the person for subjecting the thorax of the person to pressure and high frequency pressure pulses; and no more than one hose coupling the air pulse generator to the thoracic garment for transmitting air pressure and pressure pulses from the air pulse generator to the thoracic garment.
2. The apparatus of claim 1, wherein the air pulse generator comprises an air displacer assembly that provides and positive air displacement, air pressure, and air flow to the thoracic garment.
3. The apparatus of claim 1, wherein the user programmable controls comprise time, frequency, and pressure controls.
4. The apparatus of claim 1, wherein user programmable controls are provided on a control panel, and wherein the user programmable controls may be used to activate an electronic memory program to regulate time or duration of operation of the air pulse generator, frequency of the air pulses, and pressure of the air pulses directed to the garment.
5. The apparatus of claim 1, wherein the pressure of the air pulses is coordinated with the frequency of the air pulses such that the air pressure is substantially maintained at a selected pressure when the frequency of the air pulses is changed.
6. The apparatus of claim 1, wherein the garment includes an air core.
7. The apparatus of claim 6, wherein the air pulse generator includes an air outlet passage and the garment includes an air inlet passage and wherein the hose couples the air outlet passage of the pulse generator with the air inlet passage of the thoracic garment.
8. The apparatus of claim 7, wherein the garment includes a single air inlet connector.
9. The apparatus of claim 6, wherein the garment is reversible.
10. An apparatus for applying pressure and high frequency pressure pulses to the thorax of a person, comprising: an air pulse generator having user programmable controls; a garment adapted to be located on the thorax of the person for subjecting the thorax of the person to pressure and high frequency pressure pulses; and fewer than two hoses coupling the air pulse generator to the thoracic garment for transmitting air pressure and pressure pulses from the air pulse generator to the thoracic garment.
11. An apparatus for applying pressure and high frequency pressure pulses to the thorax of a person, comprising: an air pulse generator having user programmable controls; a garment adapted to be located on the thorax of the person for subjecting the thorax of the person to pressure and high frequency pressure pulses; and only one hose coupling the air pulse generator to the thoracic garment for transmitting air pressure and pressure pulses from the air pulse generator to the thoracic garment.
12. The apparatus of claim 1, wherein the garment is inflatable.
13. The apparatus of claim 1, wherein the garment includes an elongated flexible bladder having a plurality of elongated parallel chambers for accommodating air.
14. The apparatus of claim 6, further comprising an air inlet connector joined to a lower portion of the air core and releasably coupled to the hose, the hose being coupled to an air pulse outlet of the air pulse generator.
15. The apparatus of claim 1, further comprising a control, the controller being controlled with the user programmable controls, wherein the controller includes a look-up data table to control operation of the motor, speed of the motor, and pressure of air pulses directed to the garment.
16. The apparatus of claim 15, wherein the look-up table is an array of digital data of motor speed and air pressures created by the air pulse generator.
17. The apparatus of claim 1, further comprising an air flow control valve having a variable orifice operable to restrict flow of air into and out of the air pulse generator.
18. The apparatus of claim 2, wherein the air displacer assembly comprises two rigid one-piece members that angularly move relative to each other.
19. The apparatus of claim 2, wherein the air displacer assembly comprises a single rigid one-piece displacer that angularly moves.
20. The apparatus of claim 2, wherein the air displacer assembly does not include a diaphragm or an elastic member.
Description
DESCRIPTION OF THE DRAWING
[0016] FIG. 1 is a perspective view of a thoracic therapy garment located around the thorax of a person connected with a hose to a pedestal mounted air pulse generator;
[0017] FIG. 2 is a front elevational view, partly sectioned, of the thoracic therapy garment of FIG. 1 located around the thorax of a person;
[0018] FIG. 3 is an enlarged sectional view of the right side of the thoracic therapy garment of FIG. 2 on the thorax of a person;
[0019] FIG. 4 is a diagram of the user programmable control system for the air pulse generator of FIG. 1;
[0020] FIG. 5 is a top plan view of the air pulse generator;
[0021] FIG. 6 is a front elevational view of the air pulse generator shown in FIG. 5;
[0022] FIG. 7 is an end elevational view of the right end of the air pulse generator shown in FIG. 5;
[0023] FIG. 8 is an end elevational view of the left end of the air pulse generator shown in FIG. 5;
[0024] FIG. 9 is a sectional view taken along line 9-9 of FIG. 6;
[0025] FIG. 10 is a perspective view of the air pulse displacer assembly of the air pulse generator of FIG. 5;
[0026] FIG. 11 is a sectional view taken along line 11-11 of FIG. 9;
[0027] FIG. 12 is an enlarged sectional view taken along line 12-12 of FIG. 9;
[0028] FIG. 13 is a perspective view of the air pulse generator of FIG. 5 with parts of the housing removed;
[0029] FIG. 14 is a perspective view taken along line 14-14 of FIG. 9;
[0030] FIG. 15 is a sectional view taken along the line 15-15 of FIG. 5 showing the air pulse displacer assembly in the first (closed) position;
[0031] FIG. 16 is a sectional view similar to FIG. 15 showing the air pulse displacer assembly in the second (open) position;
[0032] FIG. 17 is a perspective view of an alternative power drive system for rotating the crankshafts that angularly move the displacers of the air pulse displacer assembly; and
[0033] FIG. 18 is a right end elevational view of the power drive system of FIG. 17.
DESCRIPTION OF INVENTION
[0034] A human body pulsing apparatus 10 for applying high frequency pressure pulses to the thoracic wall 69 of a person 60, shown in FIG. 1, comprises an air pulse generator 11 having a housing 12 and a thoracic therapy garment 30. A movable pedestal 29 supports generator 11 and housing 12 on a surface, such as a floor. Pedestal 29 allows respiratory therapists and patient care persons to transport the entire human body pulsating apparatus to different locations accommodating a number of persons in need of respiratory therapy and to storage locations. Air pulse generator 11 can be separated from pedestal 29 and used to provide respiratory therapy to portions of a person's body.
[0035] Human body pulsing apparatus 10 is a device used with a thoracic therapy garment 30 to apply pressure and repetitive high frequencies pressure pulses to a person's thorax to provide secretion and mucus clearance therapy. Respiratory mucus clearance is applicable to many medical conditions, such as pertussis, cystic fibrosis, atelectasis, bronchiectasis, cavitating lung disease, vitamin A deficiency, chronic obstructive pulmonary disease, asthma, and immobile cilia syndrome. Post surgical patients, paralyzed persons, and newborns with respiratory distress syndrome have reduced mucociliary transport. Air pulse generator 11 through hose 61 provides high frequency chest wall oscillations or pulses to a person's thorax enhance mucus and airway clearance in a person with reduced mucociliary transport. High frequency pressure pulses subjected to the thorax in addition to providing respiratory therapy to a person's lungs and trachea.
[0036] As shown in FIG. 1, housing 12 is a generally rectangular member having a front wall 13 and side walls 26 and 27 joined to a top wall 16. An arched member 17 having a horizontal handle 18 extended over top wall 16 is joined to opposite portions of top wall 16 whereby handle 18 can be used to manually carry air pulse generator 11 and facilitate mounting air pulse generator 11 on pedestal 29. A control panel 23 mounted on top wall 16 has interactive controls on screen 24 to program time, frequency and pressure of air directed to the therapy garment 30. Other control devices including switches and dials can be used to program time, frequency and pressure of air transmitted to therapy garment 30. The controls on screen 24 are readily accessible by the respiratory therapists and user of pulsing apparatus 10.
[0037] Private care homes, assisted living facilities and clinics can accommodate a number of persons in different rooms or locations that require respiratory therapy or high frequency chest wall oscillations as medical treatments. Air pulse generator 11 can be manually moved to required locations and connected with a flexible hose 61 to a thoracic therapy garment 30 located around a person's thorax. Air pulse generator 11 can be selectively located adjacent the left or right side of a person 60 who may be confined to a bed or chair.
[0038] Pedestal 29 has an upright gas operated piston and cylinder assembly 31 mounted on a base 32 having outwardly extended legs 33, 34, 45, 36 and 37. Other types of linear expandable and contractible devices can be used to change the location of generator 11. Caster wheels 38 are pivotally mounted on the outer ends of the legs to facilitate movement of body pulsating apparatus 10 along a support surface. One or more wheels 38 are provided with releasable brakes to hold apparatus 10 in a fixed location. An example of a pedestal is disclosed by L. J. Helgeson and Michael W. Larson in U.S. Pat. No. 7,713,219, incorporated herein by reference. Piston and cylinder assembly 31 is linearly extendable to elevate air pulse generator 11 to a height convenient to the respiratory therapist or user. A gas control valve having a foot operated ring lever 39 is used to regulate the linear extension of piston and cylinder assembly 31 and resultant elevation of pulse generator 11. Air pulse generator 11 can be located in positions between its first (closed) and second (open) positions. Lever 39 and gas control valve are operatively associated with the lower end of piston and cylinder assembly 31.
[0039] A frame assembly 41 having parallel horizontal members 42 and 43 and a platform 44 mounts housing 12 of air pulse generator 11 on top of upright piston and cylinder assembly 31. The upper member of piston and cylinder assembly 31 is secured to the middle of platform 44. The opposite ends 46 of platform 44 are turned down over horizontal members 42 and 43 and secured thereto with fasteners 48. Upright inverted U-shaped arms 51 and 52 joined to opposite ends of horizontal members 42 and 43 are located adjacent opposite side walls 26 and 27 of housing 12. U-shaped handles 56 and 57 are joined to and extend outwardly from arms 51 and 52 provide hand grips to facilitate manual movement of the air pulse generator 11 and pedestal 29 on a floor or carpet. An electrical female receptacle 58 mounted on side wall 27 faces the area surrounded by arm 51 so that arm 51 protects the male plug (not shown) that fits into receptacle 58 to provide electric power to air pulse generator 11. A tubular air outlet sleeve is mounted on side wall 26 of housing 12. Hose 61 leading to thoracic therapy garment 30 telescopes into the sleeve to allow air, air pressure and air pulses to travel through hose 61 to thoracic therapy garment 30 to apply pressure and pulses to a person's body.
[0040] Thoracic therapy garment 30, shown in FIG. 3, is located around the person's thoracic wall 69 in substantial surface contact with the entire circumference of thoracic wall 69. Garment 30 includes an air core 35 having one or more enclosed chambers 40 for accommodating air pulses and air under pressure. The pressure of the air in the enclosed chambers 40 retains garment 30 in firm contact with thoracic wall 69. Air core 35 has a plurality of holes that vent air from enclosed chambers 40. Thoracic therapy garment 30 functions to apply repeated high frequency compression or pressure pulses, shown by arrows 71 and 72, to the person's lungs 66 and 67 and trachea 68. The reaction of lungs 66 and 67 and trachea 68 to the pressure pulses causes repetitive expansion and contraction of the lung tissue resulting in secretions and mucus clearance therapy. The thoracic cavity occupies only the upper part of the thoracic cage which contains lungs 66 and 67, heart 62, arteries 63 and 64, and rib cage 70. Rib cage 70 also aids in the distribution of the pressure pulses to lungs 66 and 67 and trachea 68.
[0041] As shown in FIG. 4, air pulse generator 11 has a housing 100 located within housing 12. An electric motor 101 mounted on housing 100 operates to control the time duration and frequency of the air pulses produced by generator 11 and directed to garment 30. A sensor 102, such as a Hall effect sensor, is used to generate a signal representing the rotational speed of motor 101. A motor speed control regulator 103 wired with an electric cable 104 to motor 101 controls the operating speed of motor 101. An electric power source 105 wired to motor speed control regulator 103 supplies electric power to regulator 130 which controls the electric power to electric motor 101. The electric power source can be conventional grid electric power and/or a battery. Other devices can be used to determine the speed of motor 101 and provide speed data to controller 106. A sensor-less commutation control of a 3-phase dc motor can be used to control the rotational speed of motor 101. A controller 106 having user programmable controls with memory components and a look-up data table wired with an electric cable 107 to motor speed control regulator 103 controls the time of operation of motor 101, the speed of motor 101 and the pressure of air directed to garment 30 shown by arrow 143. The signal generated by sensor 102 is transmitted by cable 108 to controller's look-up data table that coordinates the speed of motor 101 and resulting frequency of the air pulse with a selected air pressure to maintain a selected air pressure when the speed of motor 101 and frequency of the air pulses are changed. The look-up table is an array of digital data of the speed of motor 101 and air pressures created by the air pulse generator predetermined and stored in a static program storage which is initialized by changes in the speed of motor 101 to provide an output to stepper motor 126 to regulate air flow control member 122 to maintain a preset or selected air pressure created by air pulse generator 11. The look up table may include identifying algorithms designed to take several data inputs and extrapolate a reasoned response.
[0042] Screen 24 of control panel 23 may have three user interactive controls 109, 110 and 111. Control 109 is a time or duration of operation of motor 101. For example, the time can be selected from 0 to 30 minutes. Control 110 is a motor speed regulator to control the air pulse frequency for example between 5 and 20 cycles per second or Hz. A change of the air pulse frequency results in either an increase or decrease of the air pressure in garment 30. The pressure of the air in garment 30 is selected with the use of average or bias air pressure control 111. The changes of the time, frequency and pressure may be manually altered by applying finger pressure along the controls 109, 110 and 111. Control panel may include a start symbol 112 operable to connect air pulse generator 11 to an external electric power source. Set and home symbols 113 and 114 may be used to embed the selected time, frequency, and pressure in the memory data of controller 106. A cable 116 wires controller 106 with control panel 23. One or more cables 117 wire control panel 23 to controller 106 whereby the time, frequency and pressure signals generated by slider controls 109, 110 and 111 are transmitted to controller 106. Other types of panels and devices, including tactile switches in the form of resistive or capacitive technologies and dials can be used to provide user input to controller 106.
[0043] The air pressure in garment 30 is regulated with a first member shown as a proportional air flow control valve 118 having a variable orifice operable to restrict or choke the flow of air into and out of air pulse generator 11. Valve 118 has a body 119 having a first passage 121 to allow air to flow through body 119. An air flow control member or restrictor 122 having an end extended into the first passage regulates the flow of air through passage 121 into tube 131. Body 119 has a second air bypass passage 123 that allows a limited amount of air to flow into tube 131. The air in passage 123 bypasses air flow restrictor 122 whereby a minimum amount of air flows into air pulse generator 11 so that the minimum therapy treatment will not go down to zero. A filter 124 connected to the air inlet end of body 119 filters and allows ambient air to flow into and out of valve 118. Air flow restrictor 122 is regulated with a second member shown as a stepper motor 126. Stepper motor 126 has natural set index points called steps that remain fixed when there is no electric power applied to motor 126. Stepper motor 126 is wired with a cable 127 to controller 106 which controls the operation of motor 126. An example of a stepper motor controlled metering valve is disclosed by G. Sing and A. J. Home in U.S. Patent Application Publication No. US 2010/0288364. The stepper motor control is described by L. J. Helgeson and M. W. Larson in U.S. Provisional Patent Application Ser. No. 61/573,238, incorporated herein by reference. Other types of air flow meters having electronic controls, such as a solenoid control valve, a rotatable grooved ball valve or a movable disk valve, can be used to regulate the air flow to air pulse generator 11. An orifice member 128 has a longitudinal passage 129 located in tube 131. Orifice member 128 limits the maximum air flow into and out of air pulse generator 11 to prevent excessive air pressure in garment 30.
[0044] As shown in FIGS. 5 to 9, 11 and 13, air pulse generator housing 100 has a front wall 132 and a rear wall 133 with first and second pumping chambers 137 and 140 between walls 132 and 133. An interior wall 134 and end wall 136 attached to opposite ends of walls 132 and 133 enclose pumping chambers 137 and 140. As seen in FIG. 14, interior wall 134 has a plurality of passages 138 and 139 to allow air to flow from manifold chamber 148 into pumping chambers 137 and 140. Wall 134 can have additional passages, openings or holes to allow air to flow from manifold chamber 148 into pumping chambers 137 and 140. End wall 136 has an outwardly projected tubular boss 141 having a passage 142 to allow air, shown by arrow 143, to flow out of air pulse generator 11 into hose 61 and to garment 30. The frequency of the air flow pulses is regulated by varying the operating speed of motor 101. Air flow control valve 118 largely regulates the pressure of the air discharged from the air pulse generator 11 to garment 30.
[0045] A second housing 144 joined to adjacent interior wall 134 accommodates a cover 146 enclosing a manifold chamber 148, shown in FIGS. 9 and 13. A plurality of fasteners 147 secure housing 144 and cover 146 to interior wall 134. A tubular connector 149 mounted on cover 146 and connected to tube 131 allows air to flow from air flow control valve 118 into manifold chamber 148. Passages 138 and 139 are open to manifold chamber 148 and pumping chambers 137 and 140 to allow air to flow from manifold chamber 148 into pumping chambers 137 and 140.
[0046] As shown in FIGS. 9 and 10, an air displacer assembly 151 operates to draw air into pumping chambers 137 and 140. Air displacer assembly 151 has first and second rigid air displacers 152 and 153 operable to swing or pivot between first and second positions to pump and pulse air directed to garment 30. The air displacer assembly 151 may be a single rigid air displacer operable to pivot between first and second positions to provide air pressure pulses to garment 30. The single displacer includes the structures and functions of displacer 152 angularly moved with power transmission assembly 189. The opposite sides of rear ridge 159 of displacer 152 have outwardly extended axles or pins 154 and 156. Pin 154 is rotatably mounted with a bearing 157 on end wall 136. Pin 156 is rotatably mounted on interior wall 134 with a bearing 158. A single pivot member may be used to pivotally mount displacer 152 on housing 100. Displacer 152 is a rigid member that does not change its geometric shape when pivoting about the fixed transverse axis between the first and second positions, shown in FIGS. 15 and 16. Displacer 152 has a generally rectangular shape with a transverse rear ridge 159 and a semi-cylindrical front section 161. A generally flat middle section 162 joins rear ridge 159 to front section 161. As shown in FIG. 10, the entire outer periphery of the air displacer 152 has a recess or groove 165 for retaining a seal assembly 163. As shown in FIG. 12, seal assembly 163 has a rigid component rib 164 partly located within the groove 165 and an elastic component 169 located in the base of the groove 165. The elastic component 169 has a spring-like characteristic whereby the outer surface of the rigid rib 164 is forced (or biased or pushed) into sliding engagement with the inside surfaces of the walls 132, 133, 134 and 136 of the housing 100. FIG. 11 illustrates the outer surface of the rigid rib 164 in sliding engagement with the inside surfaces 167 and 168 of the front and rear walls 132 and 133, respectively. Likewise, FIG. 12 illustrates the outer surface of the rigid rib 164 in sliding engagement with the inside surface 166 of the interior wall 134. As such, with the outer surface of the rigid rib 164 biased into sliding engagement with the inside surfaces of the walls defining the enclosed space of the housing 100, the seal assembly 163 inhibits air flow along the outer periphery of the first and second air displacers. In some embodiments, the rigid rib 164 is a high density polymer rib. In certain embodiments, the spring-like elastic component 169 of seal assembly 163 is a low-density elastic foam or a close cell elastomeric foam material. The biasing force of the elastic component 169 also compensates for structural tolerances and wear of rigid rib 164. Other types of seals and spring biasing forces can be used with displacer 152 to engage walls 132, 133, 134 and 136.
[0047] As shown in FIG. 11, the middle section 162 of displacer 152 has a plurality of holes 171 providing openings that allow air to flow, shown by arrow 176, from pumping chamber 137 to pulsing chamber 177 located between first and second air displacers 152 and 153. A check valve 172 mounted on middle section 162 allows air to flow from pumping chamber 137 to pulsing chamber 177 and prevents the flow of air from pulsing chamber 177 back to pumping chamber 137. Check valve 172 is a one-piece flexible member having a stem 173 pressed into a hole in middle section 162 and an annular flexible flange 174 covering the bottoms of holes 171 to prevent the flow of air from pulsing chamber 177 back to pumping chamber 137 when the pressure of the air in pulsing chamber 177 is higher than the air pressure in pumping chamber 137. Other types and locations of check valves can be used to control the flow of air between pumping chamber 137 and pulsing chamber 177.
[0048] As shown in FIGS. 9, 10 and 11, each power transmission assembly 189 and 212 includes an anti-backlash device operable without lost motion to angularly move the first and second displacers 152 and 153 between first and second positions. The anti-backlash device comprises an arm 178 located above middle section 162 of displacer 152. A first end of arm 178 is pivotally connected to a support 179 with a pivot pin 181. Support 179 is fastened to the rear section 160 of displacer 152. The pivot axis of pin 181 is parallel with the pivot axis of pins 154 and 156. The second or front end 182 of arm 178 extends in a downward direction toward the top of middle section 162 adjacent the semi-cylindrical section 161. Front end 182 has an upright recess 183 and a bottom wall 184 spaced above the top of middle section 162 of displacer 152. An upright bolt 186 located within recess 183 and extended through bottom wall 184 is threaded into a hole 188 in middle section 162 of displacer 152. A coil spring 187 located between the head of bolt 186 and bottom wall 184 of arm 178 biases and pivots arm 178 toward the top of displacer 152. Arm 178 and coil spring 187 provide power transmission assembly 189 with anti-backlash functions and compensate for wear and thermal expansion. Arm 178 cooperates with a power transmission assembly 189 to pivot air displacer 152 for angular movement between first and second positions.
[0049] Power transmission assembly 189 is operatively associated with displacer 152 and arm 178 to angularly move displacer 152 toward and away from displacer 153 to draw air into pumping chamber 137 and compress and pulse air in pulsing chamber 177. Power transmission assembly 189 includes a crankshaft having a shaft 191 with one end rotatably mounted on end wall 136 with a bearing 192. The opposite end of shaft 191 is rotatably mounted on interior wall 134 with a bearing 193. Other structures can be used to rotatably mount shaft 191 on housing walls 134 and 136. Crankshaft includes a crank pin 194 offset from the axis of rotation of shaft 191. A first pair of cylindrical roller members 196 rotatable mounted on crank pin 194 engage a first pad 197 retained in a recess in middle section 162 of displacer 152. A second pair of cylindrical roller members 198 rotatably mounted on crank pin 194 engage a second pad 199 retained in a recess in middle section 162 of displacer 152. Roller members 196 and 198 are axially spaced on opposite sides of arm 178. As seen in FIG. 10, a roller member 201 rotatably mounted on the middle of crank pin 194 engages the bottom surface 202 of arm 178. Roller member 201 is spaced above the top of displacer 152. Rotation of shaft 191 moves crank pin 194 in a circular path whereby rollers members 196 and 198 angularly moves displacer 152 downwardly to the first (closed) position and roller member 201 angularly moves displacer 152 upwardly to the second (open) position. Spring 187 maintains arm 178 in continuous engagement with roller member 201 and creates reaction forces on pads 197 and 199 through roller members 196 and 198 thereby eliminating clearance, backlash or lost motion between arm 178 and roller member 201.
[0050] Second air displacer 153 has the same structure as first air displacer 152. Axles or pins 203 pivotally mount the rear section of displacer 153. The axial axis of pins 203 is parallel to the axial axis of pins 154 and 156. The entire outer peripheral edges of displacer 153 has a seal 204 located in engagement with curved surfaces 206 and 207 of housing 100 as shown in FIGS. 15 and 16 and the inside surfaces of walls 134 and 136. Seal 204 has the same rib and spring as seal 163 shown in FIG. 12. The middle section of displacer 153 has holes associated with a check valve 208 to allow air to flow from pumping chamber 140 into pulsing chamber 177 and prevent the air in pulsing chamber 177 from flowing back to pumping chamber 140. Check valve 208 has the same stem and annular flexible flange as check valve 172 shown in FIG. 11. An arm 209 pivotally connected to a support 211 secured to the rear section of displacer 153 is operatively associated with a power transmission assembly 212. Power transmission assembly 212 operates to angularly move displacer 153 between first (closed) and second (open) positions as shown in FIGS. 15 and 16. Power transmission assembly 212 includes a crankshaft having a shaft 213 and roller members 214 engaging pads 216 mounted on displacer 153. Power transmission assembly 212 has the same structure as power transmission assembly 189. A check valve 208 mounted on displacer 153 controls the flow of air from pumping chamber 140 to pulsing chamber 177 and prevents the flow of air from pulsing chamber 177 back to pumping chamber 140. Check valve 208 has the same structure as check valve 172 shown in FIG. 11.
[0051] As shown in FIGS. 15 and 16, power transmission assemblies 189 and 212 are driven in opposite rotational directions with a power train assembly 217. Power train assembly 217, driven by electric motor 101, has a first belt drive comprising a timing pulley 218 drivably connected to motor 101. Timing pulley 218 accommodates an endless tooth belt 219 trained around a driven tooth timing pulley 221. A second belt drive powered by pulley 221 rotates a first pulley 222 connected to shaft 191 and a second pulley 223 connected to shaft 213 in opposite directions as shown by arrows 224 and 226. The second belt drive operates power transmission assemblies 189 and 212 to turn their respective crankshafts in opposite rotational directions to concurrently angularly move displacers 152 and 153 to first and second positions shown in FIGS. 15 and 16 thereby pulsing air in pulsing chamber 177. Pulley 227 driven by pulley 221 accommodates an endless serpentine double-sided tooth belt 228 that rides on idler pulleys 229 and 231 and trains about opposite arcuate segments of pulleys 222 and 223. The entire power train assembly 217 is located within manifold chamber 148 of second housing 144. The power train assembly 217 and power transmission assemblies 189 and 212 at least partially define a power drive system operable to angularly move the air displacers 152 and 153 to first and second positions to cause air to flow from pumping chambers 137 and 140 into pulsing chamber 177 and direct air pressure pulses out of pulsing chamber 177 into hose 61 and garment 30.
[0052] In use, as shown in FIGS. 1 to 3, garment 30 is placed about the person's upper body or thoracic wall 69. The circumferential portion of garment 30 includes an air core 35 having one or more enclosed chambers 40 that is maintained in a comfortable snug fit on thoracic wall 69. The elongated flexible hose 61 is connected to air core 35 and air pulse generator 11. Operation of air pulse generator 11 discharges air under pressure and high frequency air pressure pulses into hose 61 which are transferred to the enclosed chamber 40 of air core 35. As shown in FIGS. 2 and 3, high frequency pressure pulses 71 and 72 are transmitted from air core 35 to the person's thoracic wall 69 thereby subjecting the person's thoracic wall 69 to respiratory therapy. The person 60 or a care person sets the time, frequency and pressure controls 109, 110, 111 associated with control panel 23 to program the duration of operation of air pulse generator 11, the frequency of the air pressure pulses and the pressure of the air created by air pulse generator 11. The time program controls the operation of motor 101 that operates air displacers 152 and 153. As shown in FIGS. 15 and 16, air displacers 152 and 153 angularly pivot relative to each other between first and second positions. Air displacers 152 and 153 draw air into pumping chambers 137 and 140. The flow of air into pumping chambers 137 and 140 is regulated with air flow control valve 118. Adjustment of air flow control valve 118 with stepper motor 126 controls the pressure of the air discharged by generator 11 to air core 35 of garment 30. The flow of air into manifold chamber 148 is limited by air flow orifice member 128 to control maximum air flow into manifold chamber 148 and prevents excessive air pressure in garment 30. The air in pumping chambers 137 and 140 is forced through check valves 172 and 208 into pulsing chamber 177 located between air displacers 152 and 153. Angular movements of air displacers 152 and 153 toward each other pulses the air in pulsing chamber 177 and discharges air and air pulses through air outlet passage 142 into hose 61. Hose 61 transports air and air pulses to air core 35 of garment 30 thereby subjecting the person's thorax to pressure and high frequency pressure pulses.
[0053] As shown in FIG. 13, motor 101 drives power train assembly 217 to rotate the crankshafts of the power transmission assemblies 189 and 212 to concurrently angularly pivot air displacers 152 and 153 between first and second positions. Arms 178 and 209 pivotally mounted air displacers 152 and 153 cooperate with the crankshafts of the power transmission assemblies 189 and 212 to limit the angular movement of air displacers 152 and 153. Coil springs at the second or front end of arms 178 and 209, e.g., coil spring 187 at the second or front end of arm 178, provide power transmission assemblies 189 and 212 with anti-backlash functions and compensate for wear and thermal expansion.
[0054] A modification of the air pulse generator 300, shown in FIGS. 17 and 18, is operable to establish air pressure and air pulses which are directed by hose 61 to garment 30 to apply repetitive forces to the thoracic wall of a person. Air pulse generator 300 has a housing including end walls 301 and 302. A displacer assembly 303 located between end walls 301 and 302 has a pair of displacers 304 and 306 pivotally mounted on end walls 301 and 302 for angular movements relative to each other to draw air from a manifold chamber 308 into first and second air pumping chambers 312 and 313. The air in pumping chambers 312 and 313 flows through check valves mounted on displacers 304 and 306 into a pulsing chamber 315 located between displacers 304 and 306. Displacers 304 and 306 have the same structure and functions as displacers 152 and 153 shown in FIGS. 9, 15 and 16 which are incorporated herein by reference. As shown in FIG. 18, displacer 304 has an axle or pin 316 retained in a bearing 317 mounted in a cylindrical boss 318 joined to end wall 302. The opposite side of displacer 304 has an axle or pin rotatable mounted on end wall 301. Displacer 306 located below displacer 304 has an axle or pin 319 retained in a bearing 321 mounted in a cylindrical boss 322 joined to end wall 302. Displacers 304 and 306 angularly move relative to each other about laterally spaced parallel horizontal axes of pins 316 and 319. A housing or casing 307 joined to end wall 302 surrounds manifold chamber 308. A cover with an air inlet tubular member (not shown) attached to housing 307 encloses manifold chamber 308. End wall 302, shown in FIG. 18, has passages or openings 309 and 311 to air to flow from manifold chamber 308 into pumping chambers 312 and 313. Crankshafts 314 and 320 operate to angularly move displacers 304 and 306 in opposite arcuate directions to draw air from manifold chamber 308 through openings 309 and 311 and into pumping chambers 312 and 313 and pulse air in pulsing chamber 315 whereby air pressure and air pulses are directed by hose 61 to garment 30.
[0055] A power drive system 323 driven with an electric motor 324 rotates crankshafts 314 and 320 whereby the crankshafts concurrently angularly move displacers 304 and 306. Power drive system 323 has a first power train assembly 326 driving a second power train assembly 327 that rotates crankshafts 314 and 320. First power train assembly 326 has a drive timing pulley 328 mounted on motor drive shaft 329 engageable with an endless tooth belt 331 located around a driven timing pulley 332. Pulley 332 is secured to a shaft 333 retained in a bearing 334 mounted on a fixed support 336. Support 336 is attached to housing 307 with fasteners 337 and 338. Second power train assembly 327 has a drive timing pulley 339 mounted on shaft 333. A bearing 334 holds shaft 333 on support 336. Belt 341 extended around timing pulleys 339, 342 and 343 rotates pulleys 342 and 343 mounted on crankshafts 314 and 320 thereby rotating crankshafts 314 and 320 and angularly moving displacers 304 and 306 relative to each other. The movement of displacers 304 and 306 draws air into manifold chamber 308 and through openings 309 and 311 into pumping chambers 312 and 313. When the air pressure in pumping chambers 312 and 313 is greater than the air pressure in pulsing chamber 315, the air flows through the check valves from pumping chambers 312 and 313 into pulsing chamber 315. When the displacers 304 and 306 move toward each other, air pressure and air pulses are forced into hose 61 and carried by hose 61 to the air core 35 of garment 30. The air pressure and air pulses in air core 35 of garment 30 subjects the thoracic wall of the person with repetitive forces.
[0056] The body pulsing apparatus and method has been described as applicable to persons having cystic fibrosis. The body pulsing apparatus and method is applicable to bronchiectasis persons, post-surgical atelectasis, and stage neuromuscular disease, ventilator dependent patients experiencing frequent pneumonias, and persons with reduced mobility or poor tolerance of Trendelenburg position. Person with secretion clearance problems arising from a broad range of diseases and conditions are candidates for therapy using the body pulsating apparatus and method of the invention.
[0057] The body pulsating apparatus and method disclosed herein has one or more angularly movable air displacers and programmed controls for the time, frequency and pressure operation of the air pulse generator and method. It is understood that the body pulsating apparatus and method is not limited to specific materials, construction, arrangements and method of operation as shown and described. Changes in parts, size of parts, materials, arrangement and locations of structures may be made by persons skilled in the art without departing from the invention.
