AUTOMATIC ANKLE BRACHIAL PRESSURE INDEX SYSTEM
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Accused Products
Abstract
An ABPI measurement system includes two cuffs for each ankle and two cuffs for each arm of a patient. Each cuff has chambers. The four cuffs are applied to each limb (or finger or toe), each chamber is inflated simultaneously to a pressure until a Pneumo Arterial Plethysmography (PAPG) signal related to the arterial flow in the limb is detected at the chambers. The chambers are then simultaneously inflated until the PAPG signals are extinguished in each limb, the inflation of chambers continuing for 10 mmHg to 20 mmHg above that pressure. The chambers are then deflated and the pressure at which the PAPG signal returns in the first chamber is recorded for each limb and this value of the pressure is used to calculate the ABPI. The ABPI is displayed or sent to a remote site.
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Citations
30 Claims
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1-10. -10. (canceled)
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11. A method of measuring ABPI/TBPI using at least two inflatable cuffs wherein:
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I. at least one of the cuffs is wrapped around an upper limb, II. at least one of the cuffs is wrapped around a lower limb, III. each of the cuffs has a first and a second chamber; the method including the steps of; a. simultaneously inflating the first chambers; b. while the first chambers are inflated, simultaneously inflating the second chambers; c. subsequently deflating the first and second chambers; d. measuring the pressures in the first and second chambers. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
b. each second chamber is subsequently deflated until the PAPG signals are again detected.
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18. The method of claim 17 wherein inflation of the second chambers continues for a period after the PAPG signals are no longer detected.
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19. The method of claim 17 wherein the ratio of the pressures:
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a. in the second chamber of the cuff wrapped about the lower limb, and b. in the second chamber of the cuff wrapped about the lower limb, is calculated, using the pressures in the second chambers when the PAPG signals are again detected.
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20. The method of claim 11 wherein:
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a. the first chamber of the first cuff, and b. the first chamber of the second cuff, are inflated to different pressures.
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21. The method of claim 11 wherein:
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a. the pressures of the first chambers are measured during inflation of the first chambers, b. inflation of the first chambers is ceased after the measured pressures of the first chambers provide Pneumo Arterial Plethysmography (PAPG) signals; c. the second chambers are thereafter inflated until the PAPG signals are extinguished.
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22. The method of claim 21 wherein:
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a. inflation of the second chambers continues after the PAPG signals are extinguished; b. the second chambers are thereafter deflated.
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23. The method of claim 22 wherein the second chambers are deflated until the PAPG signals return.
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24. The method of claim 22 wherein during deflation of the second chambers, the pressures of the second chambers are recorded when the PAPG signals return.
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25. The method of claim 24 further including the step of calculating the ratio of:
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a. the pressure in the first chamber at the lower limb, to b. the pressure in the first chamber at the upper limb.
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26. An ABPI/TBPI measuring device including:
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a. at least two inflatable cuffs, wherein; (1) at least one of the cuffs is to be wrapped around an upper limb, (2) at least one of the cuffs is to be wrapped around a lower limb, (3) each of the cuffs has a first and a second chamber; b. a fluid source connected to the chambers of the cuffs and; (1) simultaneously inflating the first chambers; (2) while the first chambers are inflated, simultaneously inflating the second chambers; (3) subsequently deflating the first and second chambers; c. a pressure sensor providing measurements of the pressures in the first and second chambers.
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27. A method of measuring ABPI/TBPI wherein:
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I. an upper limb cuff is wrapped around an upper limb, II. a lower limb cuff is wrapped around a lower limb, III. each of the cuffs has a first and a second chamber; the method including the steps, for each cuff, of; a. inflating the first chamber to obtain a Pneumo Arterial Plethysmography (PAPG) signal; b. while the first chamber is inflated, inflating the second chamber until the PAPG signal disappears; c. deflating the second chamber; d. measuring the pressure in the second chamber at which the PAPG signal reappears. - View Dependent Claims (28, 29, 30)
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Specification