VIBRATING PATIENT SUPPORT APPARATUS WITH A SPRING LOADED PERCUSSION DEVICE
A vibrating patient support apparatus has a spring loaded percussion device preferably for treatment of pulmonary problems of a patient. Preferably, the percussion device is part of a bed mattress and is located beneath an upper cushioning member of the mattress for patient comfort. The percussion device preferably has a resilient pad in contact with the cushioning member, a rigid member disposed below the pad, a plurality of springs engaged between the pad and rigid member, a cam in biased contact with the rigid member by the springs and an electric motor for rotating the cam.
This application claims the benefit of U.S. provisional patent application Ser. No. 60/677,732, filed May 4, 2005, the advantages and disclosure of this application is hereby incorporated by reference.
FIELD OF THE INVENTIONThe present invention relates generally to a patient support apparatus and more particularly to a spring loaded percussion device of a vibrating patient support apparatus.
BACKGROUND OF THE INVENTIONPatient support systems are well known in the art for providing therapy to a patient. A typical patient support apparatus comprises a mattress having a plurality of air bladders for supporting the patient against the bias of gravitational forces, a percussion device that alternates inflation and deflation of air bladders to provide percussion and vibration therapy to the patient, and a rotation device, usually positioned beneath the mattress, to rotate the patient from side to side. Percussion, vibration, and rotation therapy assist in reducing pulmonary problems and bed sores, respectively.
One example of a rotation device in a mattress is shown in U.S. Pat. No. 5,611,096 to Bartlett et al. and incorporated herein by reference in its entirety. The rotation device of Bartlett et al. has two selectively inflatable and deflatable air bladders lying longitudinally beneath the mattress to provide rotation therapy to the patient for reducing bed sores. A controller including an operator input panel and display is used to control the rotation device. The input panel includes a plurality of raised buttons for advancing through and adjusting parameters associated with rotation functions.
An example of a percussion or vibrating device in a mattress is shown in U.S. Patent Application Publication No. 2004/0193078 A1, to Flick et al. and incorporated herein by reference in its entirety. The percussion device of Flick et al. discloses a vibrating pad having a plurality of bladders that fill and deflate with the flow of air or fluid at a prescribed frequency controlled by a controller causing the above mattress or mattress cushion to vibrate. This vibration therapy is capable of reducing pulmonary problems such as the accumulation of secretions in the lungs.
Unfortunately, in some applications air controlled percussion devices with inflating/deflating bladders is not practical because of manufacturing cost or the absence of pressurized air. Moreover, to treat pulmonary problems, a percussion device preferably creates a vibration with tightly controlled vibration frequencies at tightly controlled amplitudes. This control can be difficult to design into bladder devices utilizing air pressure transients alone.
SUMMARY OF THE INVENTIONA vibrating patient support apparatus has a spring loaded percussion device preferably for treatment of pulmonary problems of a patient. Preferably, the percussion device is part of a bed mattress and is located beneath an upper cushioning member of the mattress for patient comfort. The percussion device preferably has a resilient pad in contact with the cushioning member, a rigid member disposed below the pad, a plurality of springs engaged between the pad and rigid member, a cam in biased contact with the rigid member by the springs and an electric motor for rotating the cam.
Preferably, the came has a spiraling cam surface for sliding contact with the push rod and that spirals radially outward from a radially inner end to a radially outer end. Extending between the inner and outer ends is a fall face. The fall face faces in a circumferential direction opposite to the direction of rotation and substantially lies in an imaginary plane common to the rotation axis.
Objects, features and advantages of the present invention include a patient support apparatus that has a relatively lightweight and manageable mattress having numerous devices for therapeutic treatment including an electrically operated percussion device capable of tightly controlled vibration frequencies and amplitudes. Other advantages of the apparatus include a relatively simple and robust design that is inexpensive to manufacture, reduces wear and warranty costs and reduces energy consumption.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGSAdvantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
Referring to the Figures, wherein like numerals indicate like or corresponding parts throughout the several views, a vibrating patient support apparatus of the present invention is generally shown at 10.
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Preferably, a pendant 28 of the controller 72 is supported by a tower 30 coupled electrically to the mattress 20 and preferably supported structurally by the bed frame 12. The pendant 28 includes user interface 32 of the patient support apparatus 10 used to operate at least a portion of the functions of the mattress 20. The user interface 32 is preferably of a touch-screen display type that is well known to those skilled in the art for operator input, as well as output, based upon the particular software used to configure the user interface or touch-screen display 32. Here, the touch-screen display 32 has input and output capabilities. These features are shown in application Ser. No. 11/260,452, filed Oct. 27, 2005, hereby incorporated by reference.
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The percussion-vibration mechanism 38 of the spring loaded percussion device 86 is positioned below the main air bladder 36, hereinafter referred to as the percussion mechanism 38. The percussion mechanism 38 provides both percussion and vibration therapy to the patient. The particular therapy being employed is dependent on the frequency or the number of beats per second generated by the percussion mechanism 38. For example, and not to be limited to these examples, the percussion therapy usually employs 1-7 beats per second (i.e. 1-7 hertz) and the vibration therapy employs 7 to 25 beats per second (i.e. 7-25 hertz). The percussion mechanism 38 employs a plurality of compression springs 130 and a rotating cam 104 to impart the percussion motion.
Preferably, a rotation mechanism 40 of the rotation device 88 for rotation therapy is positioned generally below the percussion mechanism 38. The rotation mechanism 40 provides rotation therapy to the patient by rotating the patient from side to side. Along with percussion and percussion-vibration therapy, rotation therapy assists in reducing bed sores and pulmonary problems of the patient. The rotation mechanism 40 is preferably a pair of longitudinally positioned rotation bladders 42, shown in
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The second control unit 54 of the main control system 70 in the form of a rigid box is shown beneath the cover 24 of the mattress 20 within the perimeter of the frame 34 (see
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With further regards to the percussion device 86 and more specific to the present invention,
Operatively engaging the percussion mechanism to the rotating cam 104 is a substantially vertical push rod 116 that reciprocates in and is supported by a sleeve 118 preferably attached to the frame 34 of the mattress 22. The push rod 116 has a lower end 120 that slides against the cam surface 108 and an upper end 122 engaged to a bottom surface 124 of a rigid member or plate 126. Extending upward from a top surface 128 of the rigid member 126 are a plurality of coiled compression springs 130. A lower end 132 of the springs 126 is engaged to the rigid member 126 and an upper end 134 is attached to the resilient pad 39. Preferably, the upper end 134 of each spring 130 is seated in an inverted cup or guard 136 secured to the pad 39 for wear protection of the pad 39.
In operation of the percussion device 86, the controller 72 actuates the electric motor 100 that rotates the cam 104, for example, in a counterclockwise direction 106. The lower end 120 rides along the cam surface 108 toward the outer end 112. During this time, the push rod 116 moves upward carrying the rigid member 126 with the rod and against the biasing forces of the springs 126, the resilient pad 39 and any patient weight placed upon the pad. Generally, the springs 126 will compress and the resilient pad 39 will generally lift upward. With continued rotation of the cam 104, the push rod 116 will ride circumferentially beyond the outer end 112 of cam surface 108 and with the biasing force of the compressed springs 130, the stretched or lifted pad 39 and any weight of the patient will fall radially inward along the fall face 114 and impact the inner distal end 110 of camming surface 108. This impact reverberates through the percussion mechanism 38 and contributes toward the vibration frequency and resultant amplitudes.
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While the forms of the invention herein disclosed constitute presently preferred embodiments, many others are possible. It is not intended herein to mention all the possible equivalent forms or ramifications of the invention. It is understood that the terms used herein are merely descriptive rather than limiting, and that various changes may be made without departing from the spirit or scope of the invention. For instance, the term mattress as applied to mattress 20 is not meant to be limited to a patient's bed, but may apply to any pad assembly that supports all or any portion of a patient against the bias of gravitational forces and whether or not the patient is intended to actual sleep upon the mattress or pad assembly. In light of the present invention, one skilled in the art would now realize that the main bladder 36 of the firmness setting device 84 may be a passive cushioning member thus generally eliminating the firmness setting device 84 altogether. If such is the case, one skilled in the art would now know that the resilient pad 39 of the percussion mechanism 38 could be replaced with the cushioning member 36.
Claims
1. A percussion device of a patient support apparatus for therapeutic treatment of pulmonary problems of a patient, the percussion device comprising:
- an electric motor;
- a cam connected operably to the electric motor;
- a rigid support member biased against the cam;
- a resilient pad spaced from the support member; and
- a spring engaged between the support member and the resilient pad.
2. The percussion device set forth in claim 1 wherein the spring is a coiled spring having a upper first end connected to the resilient pad and an opposite lower end connected to the support member.
3. The percussion device set forth in claim 2 further comprising a rotation axis of the motor wherein the cam is disposed concentrically to the rotation axis.
4. The percussion device set forth in claim 3 further comprising:
- a cam surface of the cam facing radially outward; and
- a push rod in sliding contact with the cam surface at a first end and engaged to the support member at an opposite second end.
5. The percussion device set forth in claim 4 wherein the cam surface has a radially inner first end and extends circumferentially in a spiral fashion to a radially outer second end.
6. The percussion device set forth in claim 5 further comprising a fall face of the cam projecting radially outward from the inner first end to the outer second end.
7. The percussion device set forth in claim 6 wherein the first end of the push rod is biased against the cam surface by the spring so that as the first end slides against the rotating cam surface the push rod moves radially outward against a biasing force of the spring until the first end of the push rod reaches the outer second end of the cam surface at which point the push rod falls radially inward and impacts the inner first end of the cam surface.
8. The percussion device set forth in claim 6 wherein the fall face and the rotation axis both lie in a common imaginary plane.
9. The percussion device set forth in claim 1 wherein the resilient pad is a pressure controlled bladder.
10. The percussion device set forth in claim 1 wherein the spring is one of a plurality of springs.
11. A patient support apparatus for providing therapeutic treatment to a patient, the patient support apparatus comprising a bed mattress having a cushioning member and a percussion device having a resilient pad located below the cushioning member, a spring disposed below and connected to the resilient pad, a cam engaged to the spring and an electric motor connected to the cam.
12. The patient support apparatus set forth in claim 11 wherein the cushioning member is a main bladder inflated by a variable speed pump at a pressure controlled by a controller.
13. The patient support apparatus set forth in claim 11 further comprising:
- the spring being one of a plurality of springs; and
- a rigid member of the percussion device having an upper surface engaged to the plurality of springs and a lower surface biased toward the cam by the plurality of springs.
14. The patient support apparatus set forth in claim 13 further comprising a rotation device having two rotation bladders located below the rigid member of the percussion device, and wherein the two rotation bladders are independently inflated and deflated by a pump and controller.
15. The patient support apparatus set forth in claim 13 further comprising:
- a cam surface of the cam facing radially outward; and
- a push rod in sliding contact with the cam surface at a first end and engaged to the rigid member at an opposite second end.
16. The patient support apparatus set forth in claim 15 wherein the cam surface has a radially inner first end and extends circumferentially in a spiral fashion to a radially outer second end.
17. The percussion device set forth in claim 16 further comprising a fall face of the cam projecting radially outward from the inner first end to the outer second end.
18. The percussion device set forth in claim 17 wherein the fall face faces in a circumferential direction that is opposite to a direction of rotation of the cam.
Type: Application
Filed: May 4, 2006
Publication Date: Mar 8, 2007
Inventors: Frederick Blanchard (Portage, MI), Melanie Dostaler (Québec, QC)
Application Number: 11/381,669
International Classification: A47B 7/02 (20060101);