Automatic ankle brachial pressure index system
First Claim
1. A method of measuring ABPI and/or TBPI using at least two inflatable cuffs wherein:
- 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. an inflatable distal chamber situated closer to a free end of the limb whereupon the cuff is wrapped, andB. an inflatable proximal chamber situated closer to the trunk of a body from which the limb extends,the distal and proximal chambers being distanced along the limb;
the method including the steps of;
a. simultaneously inflating the distal chambers until the pressures measured therein provide Pneumo Arterial Plethysmography (PAPG) signals;
b. while the distal chambers are inflated, simultaneously inflating the second proximal chambers until the PAPG signals are no longer detected;
c. subsequently deflating the proximal chambers until PAPG signals are again detected in the distal chambers;
d. subsequently deflating the distal chambers.
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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.
26 Citations
17 Claims
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1. A method of measuring ABPI and/or 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. an inflatable distal chamber situated closer to a free end of the limb whereupon the cuff is wrapped, and B. an inflatable proximal chamber situated closer to the trunk of a body from which the limb extends, the distal and proximal chambers being distanced along the limb; the method including the steps of; a. simultaneously inflating the distal chambers until the pressures measured therein provide Pneumo Arterial Plethysmography (PAPG) signals; b. while the distal chambers are inflated, simultaneously inflating the second proximal chambers until the PAPG signals are no longer detected; c. subsequently deflating the proximal chambers until PAPG signals are again detected in the distal chambers; d. subsequently deflating the distal chambers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of measuring ABPI and/or 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 an inflatable proximal chamber, and an inflatable distal chamber spaced therefrom; the method including the steps, for each cuff, of; a. inflating the distal chamber to obtain a Pneumo Arterial Plethysmography (PAPG) signal; b. while the distal chamber is inflated, inflating the proximal chamber until the PAPG signal disappears; c. deflating the proximal chamber; d. measuring the pressure in the proximal chamber at which the PAPG signal reappears. - View Dependent Claims (15, 16, 17)
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Specification