EP0240924A2
Expired / Lapsed
EP
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Sphygmomanometer adopting recognition of korotkoff sounds
Assignee: Terumo Corp
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Filing: 1987-04-01
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Granted: —
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Expires: 2007-04-01
Abstract
Abstract A sphygmomanometer includes a pump (34, 154) for applying variable pressure to a blood vessel, a microphone (2, 150) for sensing oscillation which is produced from the blood vessel being pressurized by the pump (34, 154), a pressure detecting section (4, 156) for sensing the pressure being applied to the blood vessel, and a recognizing section (60, 158) for recognizing Korotkoff sounds out of the oscillation detected by the microphone (2, 150). When the recognizing section (60, 158) has recognized a Korotkoff sound, the instantaneous pressure on the blood vessel is detected by the pressure detecting section (4, 156) to measure blood pressure. Recognition of Korotkoff sounds by the recognizing section (60, 158) is inhibited until a predetermined period of time expires since the recognition of a Korotkoff sound, to prevent the tailing of a Korotkoff sound from being recognized erroneously.
Inventors
- 👤 Keiji Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:50
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
207 words
A sphygmomanometer comprising: pressurizing means (34, 154) for applying variable pressure to a blood vessel; oscillation detecting means (2, 150) for detecting oscillation produced from the vessel which is pressurized by said pressurizing means (34, 154); pressure detecting means (4, 156) for detecting pressure being applied to the blood vessel; Korotkoff sound recognizing means (60, 158) for recognizing a Korotkoff sound out of the oscillation which is detected by said oscillation detecting means ( 2, 150); and blood pressure computing means (14, 160) for computing blood pressure from the pressure applied to the blood vessel which is detected by said pressure detecting means (4, 156), when said Korotkoff sound recognizing means (60, 158) has recognized a Korotkoff sound; CHARACTERIZED IN THAT said sphygmomanometer further comprises: time width setting means (14, 152) for setting a predetermined period of time based on the Korotkoff sound which is recognized by said Korotkoff sound recognizing means (60, 158), and inhibiting an output from said oscillation detecting means (2, 150) to said Korotkoff sound recognizing means (60, 158) during said time width; said Korotkoff sound recognizing means (60, 158) not performing recognition of Korotkoff sounds until that period of time which is set by said time width setting means (14, 152) expires.
Claim 2
Dependent Claim
207 words
A sphygmomanometer comprising: pressurizing means (34, 154) for applying variable pressure to a blood vessel; oscillation detecting means (2, 150) for detecting oscillation produced from the vessel which is pressurized by said pressurizing means (34, 154); pressure detecting means (4, 156) for detecting pressure being applied to the blood vessel; Korotkoff sound recognizing means (60, 158) for recognizing a Korotkoff sound out of the oscillation which is detected by said oscillation detecting means ( 2, 150); and blood pressure computing means (14, 160) for computing blood pressure from the pressure applied to the blood vessel which is detected by said pressure detecting means (4, 156), when said Korotkoff sound recognizing means (60, 158) has recognized a Korotkoff sound; CHARACTERIZED IN THAT said sphygmomanometer further comprises: time width setting means (14, 152) for setting a predetermined period of time based on the Korotkoff sound which is recognized by said Korotkoff sound recognizing means (60, 158), and inhibiting an output from said oscillation detecting means (2, 150) to said Korotkoff sound recognizing means (60, 158) during said time width; said Korotkoff sound recognizing means (60, 158) not performing recognition of Korotkoff sounds until that period of time which is set by said time width setting means (14, 152) expires.
Claim 3
Dependent Claim
42 words
A sphygmomanometer in accordance with claim 1, CHARACTERIZED IN THAT said time width setting means (14, 152) sets said time width based on an amplitude of a Korotkoff sound which was recognized immediately before by said Korotkoff sound recognizing means (60, 158).
Claim 4
Dependent Claim
240 words
A sphygmomanometer in accordance with claim 1, CHARACTERIZED IN THAT said Korotkoff sound recognizing means (60, 158) holds a signal waveform which is detected by said oscillation detecting means (2, 150), detects a maximum point C 3 of said waveform held, detects a point of smallest value C 2 lying in a predetermined time slot t 1 the end of which is said maximum point C 3 detected, decides whether or not a differential in level between said point of minimum value C 2 detected and said maximum point C 3 lies within a predetermined range, when decided that said differential lies in said predetermined range, detects a point of largest value C 1 lying in a predetermined time slot t 2 the end of which is said point of smallest value C2 detected, decides whether or not a differential in level between said point of largest value C 1 detected and said point of smallest value C 2lies in a predetermined range, when decided that said differential lies in said predetermined range, detects a point of smallest value C 4 lying in a predetermined time slot t 3 the beginning of which is said maximum point C 3 , decides whether or not a differential in level between said point of smallest value C 4 and said maximum point C 3 lies in a predetermined range, and thereby recognizes a Korotkoff sound which is contained in said signal waveform.
Claim 5
Dependent Claim
241 words
A sphygmomanometer in accordance with claim 2, CHARACTERIZED IN THAT said Korotkoff sound recognizing means (60, 158) holds a signal waveform which is detected by said oscillation detecting means (2, 150), detects a maximum point C 3 of said waveform held, detects a point of smallest value C 2 lying in a predetermined time slot t 1 the end of which is said maximum point C 3 detected, decides whether or not a differential in level between said point of minimum value C 2 detected and said maximum point C 3 lies within a predetermined range, when decided that said differential lies in said predetermined range, detects a point of largest value C 1 lying in a predetermined time slot t 2 the end of which is said point of smallest value C 2 detected, decides whether or not a differential in level between said point of largest value C detected and said point of smallest value C 2 lies in a predetermined range, when decided that said differential lies in said predetermined range, detects a point of smallest value C 4 lying in a predetermined time slot t 3 the beginning of which is said maximum point C 3 , decides whether or not a differential in level between said point of smallest value C 4 and said maximum point C 3 lies in a predetermined range, and thereby recognizes a Korotkoff sound which is contained in said signal waveform.
Claim 6
Dependent Claim
34 words
A sphygmomanometer in accordance with claim 3, CHARACTERIZED IN THAT said Korotkoff sound recognizing means (60, 158) detects said maximum point of said waveform held by comparing values at three points of said waveform.
Claim 7
Dependent Claim
34 words
A sphygmomanometer in accordance with claim 4, CHARACTERIZED IN THAT said Korotkoff sound recognizing means (60, 158) detects said maximum point of said waveform held by comparing values at three points of said waveform.
Claim 8
Dependent Claim
48 words
A sphygmomanometer in accordance with claim 5, CHARACTERIZED IN THAT said Korotkoff sound recognizing means (60, 158) includes an inverting means for inverting said waveform held when a minimum point is detected out of said waveform, said inverting means inverting said waveform before said maximum point is detected.
Claim 9
Dependent Claim
48 words
A sphygmomanometer in accordance with claim 6, CHARACTERIZED IN THAT said Korotkoff sound recognizing means (60, 158) includes an inverting means for inverting said waveform held when a minimum point is detected out of said waveform, said inverting means inverting said waveform before said maximum point is detected.
Claim 10
Independent Claim
109 words
A method of detecting blood pressure comprising the steps of: applying variable pressure to a blood vessel; detecting oscillation produced from the vessel which is pressurized; recognizing a Korotkoff sound out of the oscillation detected; detecting pressure being applied to the blood vessel when said Korotkoff sound has been recognized; and computing blood pressure from the pressure applied to the blood vessel detected CHARACTERIZED IN THAT - said method further comprises the step of said step of recognizing said Korotkoff sound including the substeps of setting a predetermined period of time based on the Korotkoff sound recognized thereby not performing recognition of Korotkoff sounds during said period of time.
Claim 11
Independent Claim
109 words
A method of detecting blood pressure comprising the steps of: applying variable pressure to a blood vessel; detecting oscillation produced from the vessel which is pressurized; recognizing a Korotkoff sound out of the oscillation detected; detecting pressure being applied to the blood vessel when said Korotkoff sound has been recognized; and computing blood pressure from the pressure applied to the blood vessel detected CHARACTERIZED IN THAT - said method further comprises the step of said step of recognizing said Korotkoff sound including the substeps of setting a predetermined period of time based on the Korotkoff sound recognized thereby not performing recognition of Korotkoff sounds during said period of time.
Claim 12
Dependent Claim
37 words
A method in accordance with claim 9, CHARACTERIZED IN THAT said step of setting a predetermined period of time sets said period of time based on an amplitude of the Korotkoff sound which was recognized immediately before.
Claim 13
Dependent Claim
222 words
A method in accordance with claim 9, CHARACTERIZED IN THAT said step of recognizing said Korotkoff sound includes the substeps of holding a signal waveform detected, detecting a maximum point C 3 of said waveform held, detecting a point of smallest value C 2 lying in a predetermined time slot t 1 the end of which is said maximum point C 3 detected, deciding whether or not a differential in level between said point of minimum value C 2 detected and said maximum point C 3 lies within a predetermined range, detecting a point of largest value C 1 lying in a predetermined time slot t 2 the end of which is said point of smallest value C 2 detected when decided that said differential lies in said predetermined range, deciding whether or not a differential in level between said point of largest value C 1 detected and said point of smallest value C 2 lies in a predetermined range, detecting a point of smallest value C 4 lying in a predetermined time slot t 3 the beginning of which is said maximum point C 3 when decided that said differential lies in said predetermined range, deciding whether or-not a differential in level between said point of smallest value C 4 and said maximum point C 3 lies in a predetermined range.
Claim 14
Dependent Claim
225 words
A method in accordance with claim 10, CHARACTERIZED IN THAT said step of recognizing said Korotkoff sound includes the substeps of holding a signal waveform which is detected, detecting a maximum point C 3 of said waveform held, detecting a point of smallest value C 2 lying in a predetermined time slot t 1 the end of which is said maximum point C 3 detected, deciding whether or not a differential in level between said point of minimum value C 2 detected and said maximum point C 3 lies within a predetermined range, detecting a point of largest value C 1 lying in a predetermined time slot t 2 the end of which is said point of smallest value C 2 detected when decided that said differential lies in said predetermined range, deciding whether or not a differential in level between said point of largest value C 1 detected and said point of smallest value C 2 lies in a predetermined range, detecting a point of smallest value C 4 lying in a predetermined time slot t 3 the beginning of which is said maximum point C 3 when decided that said differential lies in said predetermined range, deciding whether or not a differential in level between said point of smallest value C 4 and said maximum point C 3 lies in a predetermined range.
Claim 15
Dependent Claim
30 words
A method in accordance with claim 11, CHARACTERIZED IN THAT said substep of detecting said maximum point of said waveform held includes comparing values at three points of said waveform.
Claim 16
Dependent Claim
30 words
A method in accordance with claim 12, CHARACTERIZED IN THAT said substep of detecting said maximum point of said waveform held includes comparing values at three points of said waveform.
Claim 17
Dependent Claim
41 words
A method in accordance with claim 13, CHARACTERIZED IN THAT said step of recognizing a Korotkoff sound includes the substep of inverting said waveform held when a minimum point is detected out of said waveform before said maximum point is detected.
Claim 18
Dependent Claim
41 words
A method in accordance with claim 14, CHARACTERIZED IN THAT said step of recognizing a Korotkoff sound includes the substep of inverting said waveform held when a minimum point is detected out of said waveform before said maximum point is detected.
References Cited (Backward Citations)
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