Control for pressurized bladder in a patient support apparatus
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05D-009/00
A47C-027/08
G01L-007/00
출원번호
US-0916766
(2006-06-12)
등록번호
US-8090478
(2012-01-03)
국제출원번호
PCT/US2006/022732
(2006-06-12)
§371/§102 date
20081210
(20081210)
국제공개번호
WO2006/135845
(2006-12-21)
발명자
/ 주소
Skinner, Andrew F.
Richards, Sandy M.
Lubbers, David P.
Dixon, Steven A.
Stacy, Richard B.
Bhai, Aziz A.
출원인 / 주소
Hill-Rom Services, Inc.
대리인 / 주소
Barnes & Thornburg LLP
인용정보
피인용 횟수 :
23인용 특허 :
139
초록▼
An apparatus for supporting a patient, such as a hospital bed, is provided. The apparatus includes a patient support surface and at least one fluid containing bladder. A pressure control assembly is operably coupled with the bladder. When the fluid pressure within the bladder falls outside of an acc
An apparatus for supporting a patient, such as a hospital bed, is provided. The apparatus includes a patient support surface and at least one fluid containing bladder. A pressure control assembly is operably coupled with the bladder. When the fluid pressure within the bladder falls outside of an acceptable range of pressure values, the active adjustment of the pressure within the bladder is initiated by the pressure control assembly if the pressure does not return to the acceptable range of pressure values within a time period, e.g., a time delay, that has a variable length.
대표청구항▼
1. A patient support comprising: at least one fluid containing bladder, the at least one bladder positioned to provide support for a patient when the patient is positioned on at least a portion of the patient support; anda pressure control assembly operably coupled to the at least one bladder to reg
1. A patient support comprising: at least one fluid containing bladder, the at least one bladder positioned to provide support for a patient when the patient is positioned on at least a portion of the patient support; anda pressure control assembly operably coupled to the at least one bladder to regulate a fluid pressure within the at least one bladder, the pressure control assembly including a programmable controller, the controller being programmed to monitor sensed pressure values of the fluid pressure within the at least one bladder and adjust the fluid pressure within the at least one bladder wherein:an acceptable range of pressure values is defined and the controller initiates adjustment of the fluid pressure within the at least one bladder when one of the sensed values is located outside the acceptable range of pressure and a time period following the sensing of the sensed value has elapsed without the fluid pressure within the at least one bladder returning to the acceptable range of pressure, the time period having a variable length;wherein the time period has a length that is a function of the difference between the sensed value and a value defining the acceptable range of pressure;wherein the time period has a length that is determined by a selected one of a plurality of different algorithms, selection of the selected one algorithm being a function of the difference between the sensed value and the value defining the acceptable range of pressure;wherein a first algorithm is selected when the difference between the sensed value and the value defining the acceptable range of pressure does not exceed a first window value; andwherein a second algorithm is selected when the difference between the sensed value and the value defining the acceptable range of pressure exceeds the first window value; and wherein the time periods determined by the first algorithm have a first maximum value and the time periods determined by the second algorithm have a second maximum value, the first maximum value being greater than the second maximum value. 2. The patient support of claim 1 wherein the time periods determined by the first algorithm are variable and the time periods determined by the second algorithm are not variable. 3. The patient support of claim 2 wherein the second algorithm initiates adjustment of the fluid pressure within the at least one bladder substantially immediately after determining that the difference between the sensed value and the value defining the acceptable range of pressure exceeds the first window value. 4. The patient support of claim 1 wherein the time periods determined by the first algorithm are a function of the stability of the sensed pressure. 5. The patient support of claim 4 wherein the stability of the sensed pressure is a function of a difference between a first variable representative of a current sensed pressure value and a second variable representative of a moving average of a most recent set of the sensed pressure values. 6. The patient support of claim 5 wherein, when the difference between the first variable and the second variable does not exceed a predetermined maximum value for a predetermined time period, the controller initiates adjustment of the fluid pressure within the least one bladder. 7. The patient support of claim 1 wherein the acceptable range of pressure is variable and the controller calculates the acceptable range of pressure values as a function of the weight of the patient. 8. The patient support of claim 1 wherein the patient support surface is an articulating surface having a plurality of configurations, the acceptable range of pressure is variable and the controller calculates the acceptable range of pressures as a function of the configuration of the patient support surface. 9. The patient support of claim 1 wherein the pressure control assembly includes a compressor in selective fluid communication with the at least one bladder, the compressor controllably communicating fluid under pressure to the at least one bladder to thereby selectively adjust the fluid pressure within the at least one bladder; and wherein the pressure control assembly further includes at least one valve for regulating a fluid flow in communication with the at least one bladder, operation of the at least one valve being controlled by the controller. 10. The patient support of claim 1 wherein the controller further defines a sleep mode method of operation wherein activation of the sleep mode increases the size of the acceptable range of pressure values and wherein the controller remains in the sleep mode after adjustment of the fluid pressure. 11. The patient support of claim 1, comprising a first fluid containing bladder, the first bladder disposed proximate the head end of the patient support surface and positioned to provide support for the patient when the patient is bearing on a portion of the patient support proximate the head end; and a second fluid containing bladder, the second bladder disposed substantially centrally between the head end and the foot end of the patient support and positioned to provide support for the patient when the patient is bearing on a portion of the patient support proximate a midpoint between the head end and the foot end;wherein the pressure control assembly is operably coupled with the first and second bladders and regulating a first fluid pressure in the first bladder and a second fluid pressure in the second bladder, the pressure control assembly including a programmable controller, the controller being programmed to monitor sensed pressure values of the first and second fluid pressures and separately adjust the first and second fluid pressures and wherein:an acceptable range of pressure values is determined for each of the first and second bladders and the controller initiates adjustment of one of the first and second fluid pressures when one of the sensed pressure values is located outside the respective one of the acceptable ranges of pressure values and a time period following the sensing of the sensed value has elapsed without the fluid pressure within the respective one of the first and second bladders returning to the respective one of the acceptable ranges of pressure values, the time period having a variable length. 12. The patient support of claim 11 further comprising a third fluid containing bladder, the third bladder disposed proximate the foot end of the patient support and positioned to provide support for the patient when the patient is bearing on a portion of the patient support proximate the foot end; and wherein the pressure control assembly is operably coupled to the third bladder and regulates a third fluid pressure in the third bladder, the controller being programmed to monitor sensed pressure values of the third fluid pressure and independently adjust the third fluid pressure wherein: a third acceptable range of pressure values is determined for the third bladder and the controller initiates adjustment of the third fluid pressure when one of the sensed third fluid pressure values is located outside the third acceptable range of pressure values and a third time period following the sensing of the sensed value has elapsed without the fluid pressure within the third bladder returning to the third acceptable range of pressure values, the third time period having a variable length. 13. The patient support of claim 12 wherein the patient support is an articulating surface and includes a first section disposed proximate the head end, a second section disposed in a central portion of the patient support surface and a third section disposed proximate the foot end, the first, second and third sections being relatively articulatable and wherein the first bladder is disposed in the first section, the second bladder is disposed in the second section and the third bladder is disposed in the third section. 14. The patient support of claim 13 wherein the acceptable ranges of pressure values for the first and second bladders are a function of the weight of the patient and a position of the first section and wherein the third acceptable range of pressure values is a function of the weight of the patient and does not vary with changes in the position of the first section. 15. The patient support of claim 14 wherein the patient support includes a weight sensing device operably coupled with the controller and the acceptable range of pressure values for each of the first and second bladders is further a function of the weight of the patient. 16. The patient support of claim 13 wherein the first section is angularly repositionable relative to the second section and wherein the controller initiates inflation of the second bladder to a value above the respective acceptable range of pressure values and returns the second bladder to the respective acceptable range of pressure values upon detection of movement of the first section through a predefined angular amount. 17. The patient support of claim of 16 wherein the acceptable range of pressure values for the second bladder is a function of the position of the first section of the articulating patient support surface and the predefined angular amount is sized wherein the controller initiated inflation is occurable without a change in the acceptable range of pressure values for the second bladder. 18. The patient support of claim 1, wherein the controller is operable to perform a method of supporting a patient, the method comprising: providing at least one fluid containing bladder to support at least a portion of the weight of the patient;monitoring the fluid pressure within the at least one bladder; andregulating the fluid pressure within the at least one bladder by defining an acceptable range of fluid pressures and adjusting the fluid pressure within the at least one bladder only when a fluid pressure value has been detected outside the acceptable range of fluid pressures and a time period following the detection of the fluid pressure value has elapsed without the fluid pressure within the at least one bladder returning to the acceptable range of fluid pressure values, the time period having a variable length. 19. The patient support of claim 18 wherein the acceptable range of fluid pressure values is variable and the acceptable range of fluid pressure values is a function of the weight of the patient. 20. The patient support of claim 18 wherein the patient is supported on an articulating surface having a plurality of configurations, the acceptable range of fluid pressure values is variable and the acceptable range of fluid pressures values is a function of the configuration of the articulating surface. 21. The patient support of claim 18, wherein the providing step includes providing first and second bladders, and the regulating step includes adjusting the fluid pressure within the first and second bladders at substantially spaced-apart times. 22. The patient support of claim 1, wherein the pressure control assembly is configured to regulate a fluid pressure in a bladder of a patient support, the pressure control assembly comprising: a sensor operable to sense fluid pressure within a bladder over time, anda wherein the programmable controller is programmed to:monitor the sensed pressure,determine whether sensed pressure is outside an acceptable range of pressure, the acceptable range having an upper boundary and a lower boundary,initiate adjustment of the fluid pressure within the bladder after a desired time period following the sensing of sensed pressure has elapsed without the fluid pressure within the bladder returning to the acceptable range of pressure,change at least one of the upper boundary and the lower boundary of the acceptable range of pressure based on at least one of: a mode of operation of the patient support, a configuration of the patient support, and a characteristic of a person to be at least partially supported by the bladder, anddetermine the desired time period based on at least one of: a difference between sensed pressure and the acceptable range of pressure, and an algorithm selected based on the difference between sensed pressure and the acceptable range of pressure. 23. The patient support of claim 22, wherein a first algorithm is selected when the difference between the sensed pressure and the acceptable range of pressure does not exceed a first window value. 24. The patient support of claim 23, wherein a second algorithm is selected when the difference between the sensed pressure and the acceptable range of pressure exceeds the first window value; and wherein the time periods determined by the first algorithm have a first maximum value and the time periods determined by the second algorithm have a second maximum value, the first maximum value being greater than the second maximum value. 25. The patient support of claim 24, wherein the time periods determined by the first algorithm have a variable length and the time periods determined by the second algorithm have a substantially invariable length. 26. The patient support of claim 22, wherein the time periods comprise time periods that are a function of the stability of the sensed pressure values. 27. The patient support of claim 26, wherein the stability of the sensed pressure values is a function of a difference between a first variable representative of a current sensed pressure value and a second variable representative of a moving average of a most recent set of the sensed pressure values. 28. The patient support of claim 1, comprising an air delivery system for a patient support including an inflatable support zone, the air delivery system comprising: an air supply,a valve coupled to the air supply,a pressure sensor operable to produce pressure signals indicative of air pressure with the support zone and an air system controller programmed to:determine a target pressure for the support zone,receive the pressure signals,determine whether pressure in the support zone deviates from the target pressure based on the pressure signals,determine a time period to elapse before adjusting pressure in the support zone, andadjust the pressure in the support zone after the time period has elapsed. 29. The patient support of claim 28, wherein the target pressure includes an acceptable tolerance. 30. The patient support of claim 29, wherein the target pressure is determined based at least in part on a weight of a patient. 31. The patient support of claim 29, further comprising an angle sensor operable to produce an angle signal indicative of a value of an angle of the support zone relative to a longitudinal axis of the support zone, wherein the target pressure is determined based at least in part on the angle signal. 32. The patient support of claim 31, wherein the controller is further programmed to determine, based on at least one of the pressure signals and the angle signal, whether a person being at least partially supported by the support zone has changed positions. 33. A patient support comprising: at least one fluid containing bladder, the at least one bladder positioned to provide support for a patient when the patient is positioned on at least a portion of the patient support; anda pressure control assembly operably coupled to the at least one bladder to regulate a fluid pressure within the at least one bladder, the pressure control assembly including a programmable controller, the controller being programmed to monitor sensed pressure values of the fluid pressure within the at least one bladder and adjust the fluid pressure within the at least one bladder wherein:an acceptable range of pressure values is defined and the controller initiates adjustment of the fluid pressure within the at least one bladder when one of the sensed values is located outside the acceptable range of pressure and a time period following the sensing of the sensed value has elapsed without the fluid pressure within the at least one bladder returning to the acceptable range of pressure, the time period having a variable length;a first fluid containing bladder, the first bladder disposed proximate the head end of the patient support surface and positioned to provide support for the patient when the patient is bearing on a portion of the patient support proximate the head end; anda second fluid containing bladder, the second bladder disposed substantially centrally between the head end and the foot end of the patient support and positioned to provide support for the patient when the patient is bearing on a portion of the patient support proximate a midpoint between the head end and the foot end;wherein the pressure control assembly is operably coupled with the first and second bladders and regulating a first fluid pressure in the first bladder and a second fluid pressure in the second bladder, the pressure control assembly including a programmable controller, the controller being programmed to monitor sensed pressure values of the first and second fluid pressures and separately adjust the first and second fluid pressures and wherein:an acceptable range of pressure values is determined for each of the first and second bladders and the controller initiates adjustment of one of the first and second fluid pressures when one of the sensed pressure values is located outside the respective one of the acceptable ranges of pressure values and a time period following the sensing of the sensed value has elapsed without the fluid pressure within the respective one of the first and second bladders returning to the respective one of the acceptable ranges of pressure values, the time period having a variable length;wherein, for each of the first and second bladders, a first algorithm is selected when the difference between the sensed value and a value defining the acceptable range of pressure does not exceed a first window value and a second algorithm is selected when the difference between the sensed value and the value defining the acceptable range of pressure exceeds the first window value; andwherein the time periods determined by the first algorithms have a first maximum value and the time periods determined by the second algorithms have a second maximum value, the first maximum values being greater than the second maximum values. 34. The patient support of claim 33 wherein the time periods determined by the first algorithms have a variable length and wherein the second algorithms initiate adjustment of the respective one of the first and second fluid pressures substantially immediately after determining that the difference between the sensed value and the respective acceptable rang of pressure exceeds the respective first window value.
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이 특허에 인용된 특허 (139)
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