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Blood pressure measuring device
| Details |
Inventors: Jewett, Warren R.;
Assignee: Vita Vet Research Group Inc. (Marion, IN)
Primary Examiner: Michell; Robert W.
Assistant Examiner: Jaworski; Francis J.
Attorney, Agent or Firm: Woodard, Weikart, Emhardt & Naughton
A noninvasive blood pressure measuring device includes display means which may be digital readouts, a sphygmomanometer or other similar means, a compression cuff, a first flexible tube, a second flexible tube, an air leak valve and monitoring, control and display circuitry. Within the compression cuff is an inflatable bladder which extends in a longitudinal direction for substantially the entire length of the compression cuff. The monitoring, control and display circuitry includes a piezoelectric crystal assembly which provides electrical signals in response to air pressure levels and changes within the first flexible tube. The first tube connects this piezoelectric crystal assembly with the compression cuff and the second tube has a hand pump at one end for inflating the bladder. The air leak valve is in line with the first tube and the air leak valve has a continuously open air escape aperture of a size which corresponds to a predetermined leak rate proportional to the pressure in the bladder. When a sphygmomanometer is incorporated as part of the display means, a branch tube connects the first flexible tube to the sphygmomanometer and a pair of light-emitting diodes mounted to the dial face of the sphygmomanometer indicate when sphygmomanometer readings should be taken for systolic and diastolic conditions. When digital readouts and a microprocessor are used as part of the monitoring, control and display circuitry, data such as, for example, heart rate and mean pressure in addition to systolic and diastolic pressures are automatically presented and may be read directly. |
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DETAILED DESCRIPTION A blood pressure measuring device according to one embodiment of the present invention comprises a sphygmomanometer, a compression cuff having an inflatable bladder therein, a flexible tube, means for inflating the inflatable bladder and an air leak valve having a continuously open air escape aperture therein sized for a predetermined leak rate.
The flexible tube is connected between the inflatable bladder and the sphygmomanometer and the air leak valve is coupled to and coaxial with this tube.
A diagnostic device for determining characteristics of a blood circulation system according to another embodiment of the present invention comprises means for applying artery occluding pressure to an appendage artery, means for gradually releasing the occluding pressure, means for sensing the pressure of blood pulsating in the artery, means for indicating pressure changes occurring in the artery and means for determining and displaying systolic blood pressure, diastolic blood pressure, heart rate and mean blood pressure.
One object of the present invention is to provide an improved blood pressure measuring device which is equally well-suited for use on adults, infants and animals.
Another object of the present invention is to provide a blood pressure measuring device which is virtually fully automatic with the only manual activities being the wrapping of the compression cuff and the inflating of the bladder.
Yet another object of the present invention is to provide an electronic indicator circuit which utilizes pressure changes in lieu of sounds in order to detect systolic and diastolic conditions.
Related objects and advantages of the present invention will be apparent from the following description.
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