Blood pressure measure system

• US 5,261,413 A
• Filed: 07/26/1991
• Issued: 11/16/1993
• Est. Priority Date: 08/02/1990
• Status: Expired due to Term

• Current Assignee: Colin Medical Technology Corporation (Omron Corporation)
• Original Assignee: Colin Electronics Co., Ltd.
• Inventors: Kawahara, Yoshimi
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): GILBERT, SAMUEL G
• Application Number:
  US07/736,689
• Time in Patent Office: 844 Days
• Field of Search: 128/683, 128/682, 128/681, 128/680, 128/679, 128/678, 128/677, 128/672
• US Class Current: 600/495
• CPC Class Codes: A61B 5/02208 using the Korotkoff method
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds

Abstract

A blood pressure monitor system including a pressing device for pressing a body portion of a subject, a measuring device for increasing the pressing force of the pressing device to a predetermined level, subsequently varying the pressing force, and measuring a blood pressure of the subject during the variation of the pressing force, the measuring device repeating the blood pressure measurement, a setting device for setting a frequency at which the measuring device repeats the blood pressure measurement, and a changing device for changing a rate of increase of the pressing force depending upon the measurement frequency set by the setting device. A blood pressure measure system including a pressing device for pressing a body portion of a subject, an automatic regulating device for step-wise increasing the pressing force of the pressing device to a predetermined level, the step-wise increase of the pressing force including alternate first and second periods, the pressing force being increased in each of the first periods and maintained in each of the second periods, and a measuring device for measuring a blood pressure of the subject while the pressing force is decreased after the step-wise increase.

Claims

1. A blood pressure monitor system comprising:

pressing means for applying a pressing force to a body portion of a subject;

measuring means for increasing the pressing force of said pressing means to a predetermined level, subsequently varying said pressing force, and measuring a blood pressure of said subject during the variation of said pressing force, said measuring means repeating the blood pressure measurement;

setting means for setting a frequency at which said measuring means repeats said blood pressure measurement; and

changing means for changing a rate of increase of said pressing force depending upon the measurement frequency set by said setting means.

2. The monitor system according to claim 1, wherein said changing means is for judging whether or not said measurement frequency is greater than a reference value, and selecting a first pressing force increase rate if the judgement is negative and a second pressing force increase rate higher than said first increase rate if the judgement is affirmative.

3. The monitor system according to claim 2, wherein said pressing means comprises an inflatable cuff, said measuring means comprises an air pump which supplies said cuff with pressurized air, and said changing means comprises a pump drive/regular circuit which changes a rotational speed of said air pump in two steps depending upon the selected first or second increase rate.

4. The monitor system according to claim 1, wherein said setting means is manually operated to set a measurement period, thereby establishing said measurement frequency, said setting means providing to said changing means an electrical signal representing said measurement period.

5. The monitor system according to claim 4, further comprising means for measuring a time lapse from a time when said measuring means commences to increase said pressing force of said pressing means for carrying out said blood pressure measurement, so that, when the measured time lapse has exceeded said measurement period set by said setting means, said measuring means commences to increase said pressing force for a repeated blood pressure measurement.

6. A blood pressure measure system comprising:

pressing means for applying a pressing force to a body portion of a subject, said pressing means comprising an inflatable cuff;

automatic regulating means for step-wise increasing the pressing force of said pressing means to a predetermined target level, the step-wise increase of said pressing force including alternate first and second periods which are predetermined independently of detection of a bio-signal produced from said subject in synchronism with a heartbeat of said subject, said pressing force being increased in each of said first predetermined periods and maintained in each of said second predetermined periods,

said regulating means comprising an open/close valve, an air reservoir, an air pump which supplies said reservoir with pressurized air, said open/close valve being opened during each said first period so as to allow the pressurized air in said reservoir to be supplied to the cuff and thereby increase a pressure in the cuff as the pressing force of said pressing means, said open/close valve being closed during each said second period so as to maintain the cuff pressure;

means for increasing, in each said second period, a pressure in said reservoir with said pressurized air from said pump, to an upper limit of a predetermined pressure range, and subsequently maintaining the reservoir pressure within said pressure range; and

measuring means for measuring a blood pressure of said subject while the cuff pressure as said pressing force is decreased after said step-wise increase.

7. The monitor system according to claim 6, wherein said pressing means comprises the inflatable cuff, and said regulating means step-wise increases said pressing force by step-wise increasing a pressure of said cuff to said predetermined target level higher than a systolic blood pressure of said subject.

8. The monitor system according to claim 7, wherein said regulating means step-wise increases said pressure of said cuff to said target level of 180 mmHg, which is normally higher than said systolic blood pressure of said subject.

9. The measure system according to claim 6, wherein said regulating means utilizes constant values as said first and second periods, respectively.

10. The measure system according to claim 6, wherein said regulating means increases said pressing force by a predetermined value in said each first period.

11. The measure system according to claim 6, wherein said measuring means periodically measures said blood pressure at predetermined intervals of time.

12. The measure system according to claim 6, wherein said regulating means effects said step-wise pressing force increase after having monotonously increased the pressing force to a predetermined low level.

13. The monitor system according to claim 12, wherein said pressing means comprises the inflatable cuff, and said regulating means begins said step-wise pressing force increase by step-wise increasing a pressure of said cuff at said predetermined low level lower than a diastolic blood pressure of said subject.

14. The monitor system according to claim 13, wherein said regulating means beings step-wise increasing said pressure of said cuff at said low level of 25 mmHg, which is normally lower than said diastolic blood pressure of said subject.