Optical noninvasive vital sign monitor
First Claim
1. An optical noninvasive sensor unit, comprising:
- a pressurizable capsule having an optically transparent or translucent inner wall adapted for placement against a skin surface of a subject over a tissue bed containing an arterial blood supply, said capsule having an expanded state and an unexpanded state;
a reflectance-type optical sensor mounted within said pressurizable capsule on the inside surface of said inner wall, said optical sensor including a light source and a photodetector aimed toward said inside surface of said inner wall; and
a restraint for restraining said capsule against the skin during said expanded state so as to allow said capsule to compress the arterial blood supply.
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Accused Products
Abstract
An optical noninvasive vital sign monitor comprising a reflectance-type optical sensor within a pressurizable capsule retained by a headband, the capsule having an optically transparent or translucent inner wall adapted for placement against a subject'"'"'s forehead. The optical sensor is mounted on the inside surface of the pressurizable capsule'"'"'s inner wall, which contacts the subject'"'"'s forehead during use, and includes a light source and a photodetector aimed toward the inside surface of the inner capsule wall. One embodiment of the vital sign monitor includes optical oscillometric circuit means responsive to an output signal from the optical sensor for determining systolic pressure, mean pressure and diastolic pressure during a transition in capsule pressure between a pressure greater than normal systolic pressure and a pressure less than normal diastolic pressure.
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Citations
24 Claims
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1. An optical noninvasive sensor unit, comprising:
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a pressurizable capsule having an optically transparent or translucent inner wall adapted for placement against a skin surface of a subject over a tissue bed containing an arterial blood supply, said capsule having an expanded state and an unexpanded state;
a reflectance-type optical sensor mounted within said pressurizable capsule on the inside surface of said inner wall, said optical sensor including a light source and a photodetector aimed toward said inside surface of said inner wall; and
a restraint for restraining said capsule against the skin during said expanded state so as to allow said capsule to compress the arterial blood supply. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical noninvasive vital sign monitor, comprising:
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a pressurizable capsule having an optically transparent or translucent inner wall adapted for placement against a skin surface of a subject over a tissue bed containing an arterial blood supply, said capsule having an expanded state and an unexpanded state;
a reflectance-type optical sensor mounted within said pressurizable capsule on the inside surface of said inner wall, said optical sensor including a light source and a photodetector aimed toward said inside surface of said inner wall;
a restraint for restraining said capsule against the skin during said expanded state so as to allow said capsule to compress the arterial blood supply; and
a processing circuit connected to said light source and photodetector for measuring blood pressure. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical noninvasive method of monitoring vital signs, comprising:
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providing a reflectance-type optical sensor having a light source and a photodetector entirely within a pressurizable capsule having an optically transparent or translucent inner wall, said light source and photodetector aimed toward the inside surface of said inner capsule wall, said capsule having an expanded state and an unexpanded state;
placing said capsule on a body part of a subject with said inner wall of said capsule over a tissue bed containing an arterial blood supply and overlying a bone surface which reflects incident light, said light source and photodetector being spaced apart from the subject'"'"'s skin by said inner wall of said capsule;
restraining said capsule against the skin during said expanded state so as to allow said capsule to compress the arterial blood supply; and
measuring blood pressure based on signals from said photodetector. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification