Automatic blood pressure measurement in hyperbaric chamber
First Claim
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1. An assembly for measuring the blood pressure of a subject disposed in a chamber whose internal pressure is different than atmospheric pressure, said assembly comprising:
- (a) a cuff in the chamber for securement to an appendage of the subject;
(b) means located externally of the chamber for inflating said cuff;
(c) means located externally of the chamber for sensing and storing cuff pressure valves, said means for sensing and storing including a differential pressure transducer;
(d) means for connecting a pressure sensing side of said differential pressure transducer with the interior of said cuff; and
(e) means for connecting a reference side of said differential pressure transducer to a pressure source equalling the pressure in the interior of the chamber.
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Abstract
Blood pressure measurements are performed on subjects disposed in hyperbaric chambers. The measurements are made by an automatic blood pressure monitoring instrument having a differential pressure transducer component. The reference side of the pressure transducer is open to the pressure in the hyperbaric chamber. A rotary vane pump is used to inflate the cuff with the inflation fluid supply from within the hyperbaric chamber, and exhaust from deflating the cuff is vented back into the hyperbaric chamber.
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Citations
11 Claims
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1. An assembly for measuring the blood pressure of a subject disposed in a chamber whose internal pressure is different than atmospheric pressure, said assembly comprising:
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(a) a cuff in the chamber for securement to an appendage of the subject; (b) means located externally of the chamber for inflating said cuff; (c) means located externally of the chamber for sensing and storing cuff pressure valves, said means for sensing and storing including a differential pressure transducer; (d) means for connecting a pressure sensing side of said differential pressure transducer with the interior of said cuff; and (e) means for connecting a reference side of said differential pressure transducer to a pressure source equalling the pressure in the interior of the chamber. - View Dependent Claims (2, 3, 4, 5)
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6. An assembly for measuring the blood pressure of a subject disposed in a hyperbaric chamber, said assembly comprising:
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(a) a cuff in the hyperbaric chamber for securement to an appendage of the subject; (b) a rotary vane pump disposed outside of the chamber, said pump being connected to said cuff and operable to inflate the latter; (c) means connecting an inlet side of said pump with the interior of the chamber whereby said pump inflates said cuff with gas from the interior of said chamber; and (d) means for sensing and recording cuff pressure values. - View Dependent Claims (7, 8)
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9. A method for measuring the blood pressure of a subject disposed in a hyperbaric chamber, said method comprising the steps of:
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(a) attaching a pressure cuff to an appendage of the subject; (b) inflating the pressure cuff with gas derived from the interior of the hyperbaric chamber; (c) providing a cuff pressure sensor for sensing the internal pressure of the pressure cuff, said cuff pressure sensor including a differential pressure transducer; (d) referencing said transducer to the interior pressure in the hyperbaric pressure chamber; and (e) sensing internal cuff pressure with said transducer. - View Dependent Claims (10, 11)
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Specification