EP0350076A1
Expired / Lapsed
EP
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Electronic clinical sphygmomanometer
Assignee: Terumo Corp
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Filing: 1989-07-07
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Granted: —
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Expires: 2009-07-07
Abstract
Abstract In an electronic clinical sphygmomanometer of the type which measures blood pressure on the basis of a Korotkoff-sound signal in a pulse-wave gate signal, the level of a detected pulse-wave signal is compared with a predetermined threshold level to form a pulse-wave gate signal the duration of which corresponds to at least a period over which the level of the pulse-wave signal is higher than the predetermined threshold level. If no Korotkoff-sound detection signal is provided in the pulse-wave gate signal thus formed, the duration of the pulse wave gate signal is extended by a predetermined time period. The thus-extended duration of the pulse-wave gate signal serves as at least the measurement period required to measure the systolic blood pressure.
Inventors
- 👤 Hitoshi C/O Terumo K.K. Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 01:05
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
An electronic clinical sphygmomanometer for measuring blood pressure on the basis of a Korotkoff-sound signal in a pulse-wave gate signal, comprising: Korotkoff-sound signal detecting means for detecting a Korotkoff-sound signal and outputting a predetermined Korotkoff-sound detection signal; pulse-wave signal detecting means for detecting a pulse-wave signal; pulse-wave gate signal generating means for generating a pulse-wave gate signal the duration of which corresponds to at least a period over which the level of said pulse-wave signal is higher than a predetermined threshold level by comparing said pulse-wave signal detected by said pulse-wave signal detecting means with said predetermined threshold level; and extending means for extending the duration of said pulse-wave gate signal by a predetermined time period when said Korotkoff-sound detection signal is not provided in said pulse-wave gate signal generated by said pulse-wave gate signal generating means.
Claim 2
Dependent Claim
137 words
An electronic clinical sphygmomanometer for measuring blood pressure on the basis of a Korotkoff-sound signal in a pulse-wave gate signal, comprising: Korotkoff-sound signal detecting means for detecting a Korotkoff-sound signal and outputting a predetermined Korotkoff-sound detection signal; pulse-wave signal detecting means for detecting a pulse-wave signal; pulse-wave gate signal generating means for generating a pulse-wave gate signal the duration of which corresponds to at least a period over which the level of said pulse-wave signal is higher than a predetermined threshold level by comparing said pulse-wave signal detected by said pulse-wave signal detecting means with said predetermined threshold level; and extending means for extending the duration of said pulse-wave gate signal by a predetermined time period when said Korotkoff-sound detection signal is not provided in said pulse-wave gate signal generated by said pulse-wave gate signal generating means.
Claim 3
Dependent Claim
31 words
An electronic clinical sphygmomanometer according to claim 1, wherein said extending means is arranged to serve during at least a measurement period allocated for the measurement of the systolic blood pressure.
Claim 4
Dependent Claim
112 words
An electronic clinical sphygmomanometer according to claim 1, wherein said Korotkoff-sound signal detecting means comprises a first filter circuit which efficiently passes a Korotkoff-sound signal component in a pressure close to the systolic blood pressure, a first single-shot circuit arranged to be triggered by the leading edge of a signal output from said first filter circuit to thereby output a Korotkoff-sound detection signal, a second filter circuit which efficiently passes a Korotkoff-sound signal component in a pressure close to the diastolic blood pressure, and a second single-shot circuit arranged to be triggered by the trailing edge of a signal output from said second filter circuit to thereby output a Korotkoff-sound detection signal.
References Cited (Backward Citations)
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