Non-toxic liquid column sphygmomanometer
First Claim
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1. A sphygmomanometer, comprising:
- (a) an elongated tube;
(b) an air chamber coupled to a first end of said tube;
(c) a liquid chamber coupled to a second end of said tube, said liquid chamber partially filled with fluid and couplable to a source of external pressure;
(d) an offset section proximate the second end of said elongated tube having a liquid offset channel of a significantly reduced cross-sectional area so as to reduce the effect of fluid level changes on pressure measurement accuracy; and
(e) at least one ventilation valve coupled to one of said elongated tube and said air chamber operative to vent said elongated tube and said air chamber to atmosphere, including a pressure switch coupled to an external pressure source and a barometric pressure and pressure error monitor coupled to said pressure switch and wherein said pressure switch on closing, closes an electrical circuit coupled to said barometric pressure and pressure error monitor causing said barometric pressure and pressure error monitor to become activated.
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Abstract
A sphygmomanometer having an elongated tube, an air chamber coupled to a first end of the tube, and a liquid chamber coupled to a second end of the tube. The liquid chamber is partially filled with fluid and is couplable to a source of external pressure. An offset region located proximate the second end of the tube has a significantly reduced cross-sectional area so as to reduce the effect of fluid level changes on pressure measurement accuracy. At least one ventilation valve is coupled to the elongated tube and the air chamber and is operative to vent the elongated tube and the air chamber to atmosphere.
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Citations
16 Claims
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1. A sphygmomanometer, comprising:
- (a) an elongated tube;
(b) an air chamber coupled to a first end of said tube;
(c) a liquid chamber coupled to a second end of said tube, said liquid chamber partially filled with fluid and couplable to a source of external pressure;
(d) an offset section proximate the second end of said elongated tube having a liquid offset channel of a significantly reduced cross-sectional area so as to reduce the effect of fluid level changes on pressure measurement accuracy; and
(e) at least one ventilation valve coupled to one of said elongated tube and said air chamber operative to vent said elongated tube and said air chamber to atmosphere, including a pressure switch coupled to an external pressure source and a barometric pressure and pressure error monitor coupled to said pressure switch and wherein said pressure switch on closing, closes an electrical circuit coupled to said barometric pressure and pressure error monitor causing said barometric pressure and pressure error monitor to become activated. - View Dependent Claims (2, 3, 4, 5, 6)
- (a) an elongated tube;
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7. A sphygmomanometer, comprising:
- (a) an elongated tube;
(b) an air chamber coupled to a first end of said tube;
(c) a liquid chamber coupled to a second end of said tube, a portion of which is filled with non-toxic liquid;
(d) one of a sliding insert, screw insert and integrated insert insertable into said air chamber and one of a barometric pressure and altitude scale on said air chamber or said one insert according to which said one insert adjusts a volume of air in said air chamber; and
(e) a ventilation valve coupled to one of said elongated tube and said air chamber operative to vent said elongated tube and said air chamber to ambient air pressure upon being open and to seal said elongated tube and said air chamber against ambient air upon being closed, including pressure switch coupled to an external pressure source and a barometric pressure and pressure error monitor coupled to said pressure switch, wherein said pressure switch on closing, closes an electrical circuit coupled to said barometric pressure and pressure error monitor causing said barometric pressure and pressure error monitor to become activated. - View Dependent Claims (8, 9, 10, 11, 12)
- (a) an elongated tube;
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13. A sphygmomanometer, comprising:
- (a) an elongated tube;
(b) an air chamber coupled to a first end of said elongated tube;
(c) a liquid chamber coupled to a second end of said elongated tube, a portion of which is filled with liquid;
(d) an automatic ventilation valve coupled to said elongated tube, normally open to atmosphere and responsive to an increase in pressure of an external pressure source to close and, in response to a drop in pressure back to atmospheric pressure of said air chamber, to re-open, wherein said liquid is non-toxic, including a pressure switch and a barometric pressure and pressure error monitor coupled to said pressure switch wherein said pressure switch closes in response to an increasing source pressure and closes an electrical circuit coupled to said barometric pressure and pressure error monitor causing the latter to become activated. - View Dependent Claims (14)
- (a) an elongated tube;
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15. A sphygmomanometer, comprising:
- (a) an elongated tube having a fluid passageway of varying cross sectional area along the length of the fluid passageway;
(b) an air chamber coupled to a first end of said tube;
(c) a liquid chamber coupled to a second end of said tube and couplable to a source of external pressure;
(d) an insert insertable into said air chamber for adjusting a volume of air in said air chamber; and
(e) a ventilation valve counted to one of said elongated tube and said air chamber operative to vent said elongated tube and said air chamber to atmosphere, including pressure switch coupled to an external pressure source and a barometric pressure and pressure error monitor coupled to said pressure switch, wherein said pressure switch on closing, closes an electrical circuit coupled to said barometric pressure and pressure error monitor causing said barometric pressure and pressure error monitor to become activated.
- (a) an elongated tube having a fluid passageway of varying cross sectional area along the length of the fluid passageway;
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16. A sphygmomanometer, comprising:
- (a) an elongated tube having a fluid passageway of varying cross sectional area along the length of the fluid passageway;
(b) an air chamber coupled to a first end of said tube;
(c) a liquid chamber coupled to a second end of said tube and couplable to a source of external pressure;
(d) an insert insertable into said air chamber for adjusting a volume of air in said air chamber; and
(e) a ventilation valve coupled to one of said elongated tube and said air chamber operative to vent said elongated tube and said air chamber to atmosphere, including a vapour loss reduction air valve intermediate said liquid chamber and an external pressure source, operative to block vapour loss and to permit the passage of air between said external pressure source and said liquid chamber.
- (a) an elongated tube having a fluid passageway of varying cross sectional area along the length of the fluid passageway;
Specification