EP0332701A1
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Automatic tonometer
Assignee: Terumo Corp
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Filing: 1987-11-19
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Granted: —
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Expires: 2007-11-19
Abstract
Abstract The automatic tonometer in accordance with the present invention pays specific attention to a cuff pressure and the amplitude of pulsation and, based on the relation therebetween, estimates maximum and minimum blood pressure values while the cuff pressure is being raised. The pressure inside the cuff is increased or decreased relatively quickly to the proximity of an estimated maximum or minimum blood pressure value in order to minimize any load applied to the subject. More specifically, the cuff is pressurized at a relatively high pressurizing rate before the estimated maximum blood pressure value is almost attained and the rate Is thereafter reduced down to one required by that measurement so as to measure the maximum blood pressure value. To measure the minimum blood pressure value, the pressure is reduced quickly to a level a predetermined value above the estimated minimum blood pressure value immediately after completion of measurement of the maximum blood pressure value, and the pressure reducing speed is then reduced to actually measure the minimum blood pressure value. In this manner, the pressure and time load applied to the subject can be minimized. The present invention eliminates the trouble of setting a raised pressure value which is about 30 mmHg higher than the estimated maximum blood pressure value.
Inventors
- 👤 Takahiro Terumo Kabushiki Kaisha Souma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 23:39
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208; A61B5/02108; A61B5/02116
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
159 words
An automatic sphygmomanometer comprising: pressure detecting means for detecting a cuff pressure; first pressure-increasing means for increasing said cuff pressure at a high pressure-increasing rate; pulse-wave signal detecting means for detecting the amplitude of the pulse-wave signal of a subject while said first pressure-increasing means is increasing said cuff pressure; maximal blood pressure predicting means for predicting a maximal blood pressure from said detected amplitude of said pulse-wave signal; second pressure-increasing means for increasing said cuff pressure at a rate lower than said pressure-increasing rate of said first pressure-increasing means when said pressure detecting means detects an increase in said cuff pressure to a predetermined level below said predicted maximal blood pressure; measuring means for measuring said maximal blood pressure while said second pressure-increasing means is increasing said cuff pressure; and de-energizing means for de-energizing said second pressure-increasing means after said measuring means has measured said maximal blood pressure, in order to prepare to measure a minimal blood pressure.
Claim 2
Dependent Claim
159 words
An automatic sphygmomanometer comprising: pressure detecting means for detecting a cuff pressure; first pressure-increasing means for increasing said cuff pressure at a high pressure-increasing rate; pulse-wave signal detecting means for detecting the amplitude of the pulse-wave signal of a subject while said first pressure-increasing means is increasing said cuff pressure; maximal blood pressure predicting means for predicting a maximal blood pressure from said detected amplitude of said pulse-wave signal; second pressure-increasing means for increasing said cuff pressure at a rate lower than said pressure-increasing rate of said first pressure-increasing means when said pressure detecting means detects an increase in said cuff pressure to a predetermined level below said predicted maximal blood pressure; measuring means for measuring said maximal blood pressure while said second pressure-increasing means is increasing said cuff pressure; and de-energizing means for de-energizing said second pressure-increasing means after said measuring means has measured said maximal blood pressure, in order to prepare to measure a minimal blood pressure.
Claim 3
Dependent Claim
37 words
An automatic sphygmomanometer according to claim 1, wherein said first pressure-increasing means is energized after said cuff pressure has reached approximately 30 mmHg, said cuff pressure being rapidly increased until said cuff pressure reaches approximately 30 mmHg.
Claim 4
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 1, wherein said pressure-increasing rate of said first pressure-increasing means is approximately 50 mmHg/7 seconds.
Claim 5
Dependent Claim
32 words
An automatic sphygmomanometer according to claim 1, wherein said predicting means predicts said maximal blood pressure by utilizing the proportion of the amplitude of said pulse-wave signal to the maximum amplitude thereof.
Claim 6
Dependent Claim
31 words
An automatic sphygmomanometer according to claim 1, wherein said second pressure-increasing means is energized when said pressure detecting means detects a pressure corresponding to the maximum amplitude of said pulse-wave signal.
Claim 7
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 1, wherein the pressure-increasing rate of said second pressure-increasing means is approximately 50 mmHg/12 seconds.
Claim 8
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 1 further including a limiter for preventing said cuff pressure from exceeding a predetermined pressure.
Claim 9
Dependent Claim
151 words
An automatic sphygmomanometer comprising: pressure detecting means for detecting a cuff pressure; pressure-increasing means for increasing said cuff pressure; pulse-wave signal detecting means for detecting the amplitude of the pulse-wave signal of a subject while said first pressure-increasing means is increasing said cuff pressure at said pressure-increasing rate; minimal blood pressure predicting means for predicting a minimal blood pressure from said detected amplitude of said pulse-wave signal; first pressure-reducing means for reducing said cuff pressure at a high pressure-reducing rate after the maximal blood pressure has been measured; second pressure-reducing means for reducing said cuff pressure at a rate lower than the pressure-reducing rate of said first pressure reducing means when said pressure detecting means detects a reduction in said cuff pressure to a predetermined level above said predicted minimal blood pressure, and measuring means for measuring said minimal blood pressure while said second pressure-reducing means is reducing said cuff pressure.
Claim 10
Dependent Claim
151 words
An automatic sphygmomanometer comprising: pressure detecting means for detecting a cuff pressure; pressure-increasing means for increasing said cuff pressure; pulse-wave signal detecting means for detecting the amplitude of the pulse-wave signal of a subject while said first pressure-increasing means is increasing said cuff pressure at said pressure-increasing rate; minimal blood pressure predicting means for predicting a minimal blood pressure from said detected amplitude of said pulse-wave signal; first pressure-reducing means for reducing said cuff pressure at a high pressure-reducing rate after the maximal blood pressure has been measured; second pressure-reducing means for reducing said cuff pressure at a rate lower than the pressure-reducing rate of said first pressure reducing means when said pressure detecting means detects a reduction in said cuff pressure to a predetermined level above said predicted minimal blood pressure, and measuring means for measuring said minimal blood pressure while said second pressure-reducing means is reducing said cuff pressure.
Claim 11
Dependent Claim
19 words
An automatic sphygmomanometer according to claim 8, wherein said first pressure-reducing means is energized by opening an exhaust valve.
Claim 12
Dependent Claim
32 words
An automatic sphygmomanometer according to claim 8, wherein said predicting means predicts said minimal blood pressure by utilizing the proportion of the amplitude of said pulse-wave signal to the maximum amplitude thereof.
Claim 13
Dependent Claim
43 words
An automatic sphygmomanometer according to claim 8, wherein said second pressure-reducing means is energized when said pressure detecting means determines that said cuff pressure has become approximately equal to 10 mmHg plus the pressure corresponding to the maximum amplitude of said pulse-wave signal.
Claim 14
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 8, wherein the pressure-reducing rate of said second pressure-reducing means is approximately 50 mmHg/12 seconds.
Claim 15
Dependent Claim
23 words
An automatic sphygmomanometer according to claim 8, wherein cuff-charged air is rapidly exhausted after said measuring means has measured said minimal blood pressure.
Claim 16
Dependent Claim
217 words
An automatic sphygmomanometer comprising: pressure detecting means for detecting a cuff pressure; first pressure-increasing means for increasing said cuff pressure at a high pressure-increasing rate; pulse-wave signal detecting means for detecting the amplitude of the pulse-wave signal of a subject while said first pressure-increasing means is increasing said cuff pressure; predicting means for predicting maximal and minimal blood pressures from said detected amplitude of said pulse-wave signal; second pressure-increasing means for increasing said cuff pressure at a rate lower than said pressure-increasing rate of said first pressure-increasing means when said pressure detecting means detects an increase in said cuff pressure to a predetermined level below said predicted maximal blood pressure; maximal blood pressure measuring means for measuring said maximal blood pressure while said second pressure-increasing means is increasing said cuff pressure; first pressure-reducing means for reducing said cuff pressure at a high pressure-reducing rate when said maximal blood pressure has been measured; second pressure-reducing means for reducing said cuff pressure at a rate lower than said pressure-reducing rate of said first pressure-reducing means when said pressure detecting means detects a reduction in said cuff pressure to a predetermined level above said predicted minimal blood pressure; and minimal blood pressure measuring means for measuring said minimal blood pressure while said second pressure-reducing means is reducing said cuff pressure.
Claim 17
Dependent Claim
217 words
An automatic sphygmomanometer comprising: pressure detecting means for detecting a cuff pressure; first pressure-increasing means for increasing said cuff pressure at a high pressure-increasing rate; pulse-wave signal detecting means for detecting the amplitude of the pulse-wave signal of a subject while said first pressure-increasing means is increasing said cuff pressure; predicting means for predicting maximal and minimal blood pressures from said detected amplitude of said pulse-wave signal; second pressure-increasing means for increasing said cuff pressure at a rate lower than said pressure-increasing rate of said first pressure-increasing means when said pressure detecting means detects an increase in said cuff pressure to a predetermined level below said predicted maximal blood pressure; maximal blood pressure measuring means for measuring said maximal blood pressure while said second pressure-increasing means is increasing said cuff pressure; first pressure-reducing means for reducing said cuff pressure at a high pressure-reducing rate when said maximal blood pressure has been measured; second pressure-reducing means for reducing said cuff pressure at a rate lower than said pressure-reducing rate of said first pressure-reducing means when said pressure detecting means detects a reduction in said cuff pressure to a predetermined level above said predicted minimal blood pressure; and minimal blood pressure measuring means for measuring said minimal blood pressure while said second pressure-reducing means is reducing said cuff pressure.
Claim 18
Dependent Claim
37 words
An automatic sphygmomanometer according to claim 14, wherein said first pressure-increasing means is energized after said cuff pressure has reached approximately 20 mmHg, said cuff pressure being rapidly increased until said cuff pressure reaches approximately 20 mmHg.
Claim 19
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 14, wherein said pressure-increasing rate of said first pressure-increasing means is approximately 50 mmHg/7 seconds.
Claim 20
Dependent Claim
34 words
An automatic sphygmomanometer according to claim 14, wherein said predicting means predicts said maximal and minimal blood pressures by utilizing the proportion of the amplitude of said pulse-wave signal to the maximum amplitude thereof.
Claim 21
Dependent Claim
31 words
An automatic sphygmomanometer according to claim 14, wherein said second pressure-increasing means is energized when said pressure detecting means detects a pressure corresponding to the maximum amplitude of said pulse-wave signal.
Claim 22
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 14, wherein the pressure-increasing rate of said second pressure-increasing means is approximately 50 mmHg/12 seconds.
Claim 23
Dependent Claim
19 words
An automatic sphygmomanometer according to claim 14, wherein said first pressure-reducing means is energized by opening an exhaust valve.
Claim 24
Dependent Claim
43 words
An automatic sphygmomanometer according to claim 14, wherein said second pressure-reducing means is energized when said pressure detecting means determines that said cuff pressure has become approximately equal to 10 mmHg plus a pressure corresponding to the maximum amplitude of said pulse-wave signal.
Claim 25
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 14, wherein said pressure-reducing rate of said second pressure-reducing means is approximately 50 mmHg/12 seconds.
Claim 26
Dependent Claim
23 words
An automatic sphygmomanometer according to claim 14, wherein cuff-charged air is rapidly exhausted after said measuring means has measured said minimal blood pressure.
Claim 27
Dependent Claim
21 words
An automatic sphygmomanometer according to claim 14 further including a limiter for preventing said cuff pressure from exceeding a predetermined pressure.
References Cited (Backward Citations)
No citation records indexed.
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