EP0698370A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Blood-pressure monitor apparatus
Assignee: Colin Corp
•
Filing: 1995-08-22
•
Granted: —
•
Expires: 2015-08-22
Abstract
Abstract A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, including a blood-pressure measuring device (54, 10) which includes an inflatable cuff (10) adapted to be wound around a body portion of a living subject and measures a blood pressure of the subject by changing a pressing pressure of the cuff to not lower than a systolic blood pressure of the subject, a cuff-pressure control device (56) which iteratively changes, after a predetermined rest period (T 1M ) following the blood pressure measurement of the blood-pressure measuring device, the pressure of the cuff to a predetermined value (P CM ) lower than the systolic blood pressure of the subject, and a blood-pressure-change identifying device (70) for identifying a change of the blood pressure of the subject based on (a) respective amplitudes (Am s ) of first heartbeat-synchronous pulses obtained from the cuff during the blood pressure measurement of the blood-pressure measuring device, (b) respective pressures (Pm s ) of the cuff when the first pulses are obtained, (c) respective amplitudes (Am m ) of second heartbeat-synchronous pulses obtained from the cuff during each of the iterative changings of the cuff pressure by the cuff-pressure control device, and (d) respective pressures (Pm m ) of the cuff when the second pulses are obtained.
Inventors
- 👤 Chikao c/o Colin Corp. Harada
- 👤 Yoshihisa Colin Corp. Miwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:26
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/02108; A61B5/02116; A61B5/022; A61B5/02225; A61B5/0225; G; G16; G16H; G16H15/00; G16H40/00; G16H40/60; G16H40/63
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
216 words
A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, comprising: a blood-pressure measuring device (10, 54) which includes an inflatable cuff (10) adapted to be wound around a body portion of a living subject and measures a blood pressure of the subject by changing a pressing pressure (Pc) of said cuff to not lower than a systolic blood pressure of the subject; a cuff-pressure control device (56) which iteratively changes, after a predetermined rest period (T 1M ) following the blood pressure measurement of said blood-pressure measuring device, the pressure of said cuff to a predetermined value (P CM ) lower than the systolic blood pressure of the subject; and blood-pressure-change identifying means (70) for identifying a change of the blood pressure of the subject based on (a) respective amplitudes (Am s ) of first heartbeat-synchronous pulses obtained from said cuff during said blood pressure measurement of said blood-pressure measuring device, (b) respective pressures (Pm s ) of said cuff when said first pulses are obtained, (c) respective amplitudes (Am m ) of second heartbeat-synchronous pulses obtained from said cuff during each of the iterative changings of the cuff pressure by said cuff-pressure control device, and (d) respective pressures (Pm m ) of said cuff when said second pulses are obtained.
Claim 2
Dependent Claim
98 words
A blood pressure monitor apparatus according to claim 1, further comprising: a first memory (58) which stores the respective amplitudes of said first pulses obtained from said cuff during said blood pressure measurement of said blood-pressure measuring device, and the respective pressures of said cuff when said first pulses are obtained; and a second memory (60) which stores the respective amplitudes of said second pulses obtained from said cuff during said each of the iterative changings of the cuff pressure by said cuff-pressure control device, and the respective pressures of said cuff when said second pulses are obtained.
Claim 3
Dependent Claim
133 words
A blood pressure monitor apparatus according to claim 1 or claim 2, wherein said blood-pressure-change identifying means (70) comprises: cuff-pressure comparing means (62, SM1) for comparing a first pressure (Pm smax ) of said cuff at which one (Am smax ) of said first pulses which has a greatest amplitude of the first pulses obtained when the pressures of the cuff are not higher than said predetermined value is obtained, with a second pressure (Pm mmax ) of said cuff at which one (Am mmax ) of said second pulses which has a greatest amplitude is obtained; and means (SM2) for identifying said change of the blood pressure of the subject, when said cuff-pressure comparing means provides a first comparison result that said second cuff pressure is lower than said first cuff pressure.
Claim 4
Dependent Claim
207 words
A blood pressure monitor apparatus according to any one of claims 1 to 3, wherein said blood-pressure-change identifying means (70) comprises: cuff-pressure comparing means (62, SM1) for comparing a first pressure (Pm smax ) of said cuff at which one (Am smax ) of said first pulses which has a greatest amplitude of the first pulses obtained when the pressures of the cuff are not higher than said predetermined value is obtained, with a second pressure (Pm mmax ) of said cuff at which one (Am mmax ) of said second pulses which has a greatest amplitude is obtained; judging means (SM3) for judging, when said cuff-pressure comparing means provides a second comparison result that said second cuff pressure is not lower than said first cuff pressure, whether an amplitude (M m ) of said second pulses which is obtained when the cuff pressure takes a reference value has changed from an amplitude (M s ) of said first pulses which is obtained when the cuff pressure takes said reference value, by not smaller than a predetermined proportion of said amplitude of said first pulses; and means (SM6) for identifying said change of the blood pressure of the subject when said judging means makes a positive judgment.
Claim 5
Dependent Claim
86 words
A blood pressure monitor apparatus according to claim 4, wherein said judging means (SM4) comprises means for judging whether said amplitude of said second pulses obtained as a value (M m ) of an envelope or a cumulative curve of the second pulses when the cuff pressure takes said reference value has changed from said amplitude of said first pulses obtained as a value (M s ) of an envelope or a cumulative curve of the first pulses when the cuff pressure takes said reference value.
Claim 6
Dependent Claim
131 words
A blood pressure monitor apparatus according to any of claims 1 to 5, wherein said blood-pressure-change identifying means (70) comprises: rate-of-change calculating means (64, SM7) for calculating a first rate of change (K s ) of the respective amplitudes of the first pulses obtained when the pressures of the cuff are not higher than the predetermined value, with respect to the corresponding pressures of said cuff, and a second rate of change (K m ) of said respective amplitudes of said second pulses with respect to said respective pressures of said cuff when said second pulses are obtained; and means (SM9, SM10) for identifying said change of the blood pressure of the subject when a difference between said first and second rates of change is greater than a predetermined value (α).
Claim 7
Dependent Claim
113 words
A blood pressure monitor apparatus according to any of claims 1 to 6, further comprising: a first pulse-rate measuring device (66) which measures a first pulse rate (PR s ) of the subject during the blood pressure measurement of said blood-pressure measuring device; and a second pulse-rate measuring device (68) which measures a second pulse rate (PR m ) of the subject during said each of the iterative changings of the cuff pressure by said cuff-pressure control device, said blood-pressure-change identifying means (70, SM12) identifying said change of the blood pressure of the subject when said second pulse rate has changed from said first pulse rate by not smaller than a predetermined amount.
Claim 8
Dependent Claim
130 words
A blood pressure monitor apparatus according to any of claims 1 to 7, wherein said cuff-pressure control device (56) comprises means for iteratively changing, after said predetermined rest period, the pressure of said cuff to said predetermined value (P CH ) not higher than a mean blood pressure (P MEAN ) of the subject, and wherein said blood-pressure-change identifying means (172, 280) comprises means for identifying said change of the blood pressure of the subject based on a first relationship (Fig. 24) between said respective amplitudes of said first pulses and said respective pressures of said cuff when said first pulses are obtained and a second relationship (Fig. 25) between said respective amplitudes of said second pulses and said respective pressures of said cuff when said second pulses are obtained.
Claim 9
Dependent Claim
181 words
A blood pressure monitor apparatus according to claim 8, wherein said blood-pressure-change identifying means (172) comprises: pulse-amplitude-window determining means (T9-1, T9-2) for determining, in a coordinate system defined by a first axis indicative of the cuff pressure and a second axis indicative of the pulse amplitude, a pulse-amplitude window (W A ) which is defined by a reference line (L s ) representing said first relationship and has a first width (H A ) along said second axis; deviation identifying means (T9-4, T9-5) for counting, from data points plotted in said coordinate system which points represent, as said second relationship, said respective amplitudes of said second pulses and said respective pressures of said cuff when said second pulses are obtained, a first number of the data points which fall within said pulse-amplitude window, and identifying a deviation of said second relationship from said first relationship based on the counted first number; and means (T9-7) for identifying said change of the blood pressure of the subject when said deviation identifying means identifies said deviation of said second relationship from said first relationship.
Claim 10
Dependent Claim
148 words
A blood pressure monitor apparatus according to claim 9, wherein said blood-pressure-change identifying means (172) further comprises cuff-pressure window determining means (T9-3) for determining, in said coordinate system, a cuff-pressure window (W P ) which is defined by said reference line and has a second width (H P ) along said first axis, said deviation identifying means (T9-5) counting, from said data points plotted in said coordinate system, a second number of the data points which fall within said cuff-pressure window, and identifying said deviation of said second relationship from said first relationship based on both said counted first number and the counted second number, said blood-pressure-change identifying means (T9-7) comprising means for identifying said change of the blood pressure of the subject when said deviation identifying means identifies said deviation of said second relationship from said first relationship based on both said first and second counted numbers.
Claim 11
Dependent Claim
94 words
A blood pressure monitor apparatus according to claim 9, wherein said pulse-amplitude window determining means (T9-1, T9-2) comprises: approximate-line determining means (T9-1) for determining, as said reference line, an approximate line (L s ) approximating said first relationship within a range of the pressures of said cuff which are not higher than said mean blood pressure of the subject; and means (T9-2) for determining said pulse-amplitude window (W A ) which has said approximate line as a center line thereof and respective halves of said first width on both sides of said approximate line.
Claim 12
Dependent Claim
71 words
A blood pressure monitor apparatus according to claim 11, wherein said approximate-line determining means (T9-1) comprises means for determining, as said approximate line, one of (a) a least-square approximate line and (b) a regression line, based on data points plotted in said coordinate system which points represent, as said first relationship, said respective amplitudes of said first pulses and said respective pressures of said cuff when said first pulses are obtained.
Claim 13
Dependent Claim
94 words
A blood pressure monitor apparatus according to claim 10, wherein said cuff-pressure window determining means (T9-1, T9-3) comprises: approximate-line determining means (T9-1) for determining, as said reference line, an approximate line (L s ) approximating said first relationship within a range of the pressures of said cuff which are not higher than said mean blood pressure of the subject; and means (T9-3) for determining said cuff-pressure window (W P ) which has said approximate line as a center line thereof and respective halves of said second width on both sides of said approximate line.
Claim 14
Dependent Claim
71 words
A blood pressure monitor apparatus according to claim 13, wherein said approximate-line determining means (T9-1) comprises means for determining, as said approximate line, one of (a) a least-square approximate line and (b) a regression line, based on data points plotted in said coordinate system which points represent, as said first relationship, said respective amplitudes of said first pulses and said respective pressures of said cuff when said first pulses are obtained.
Claim 15
Dependent Claim
116 words
A blood pressure monitor apparatus according to any one of claims 8 to 14, wherein said blood-pressure-change identifying means (28) comprises: area calculating means (T9-11, T9-12) for calculating an area (S A , S B ) bounded by a first line representing said first relationship and a second line representing said second relationship, within a predetermined range of the pressures of said cuff; deviation identifying means (T9-13, T9-15) for identifying a deviation of said second relationship from said first relationship based on the calculated area; and means (T9-16, T9-17) for identifying said change of the blood pressure of the subject when said deviation identifying means identifies said deviation of said second relationship from said first relationship.
Claim 16
Dependent Claim
130 words
A blood pressure monitor apparatus according to claim 15, wherein said area calculating means (T9-11) comprises means for calculating a first area (S A ) bounded by a first portion of said first line and a first portion of said second line which is greater than said first portion of said first line with respect to the pulse amplitude, and a second area (S B ) bounded by a second portion of said first line and a second portion of said second line which is smaller than said second portion of said first line with respect to the pulse amplitude, and wherein said blood-pressure-change identifying means (T9-17) comprises means for identifying a decrease of the blood pressure of the subject when said first area is greater than said second area.
Claim 17
Dependent Claim
130 words
A blood pressure monitor apparatus according to claim 15, wherein said area calculating means (T9-11) comprises means for calculating a first area (S A ) bounded by a first portion of said first line and a first portion of said second line which is greater than said first portion of said first line with respect to the pulse amplitude, and a second area (S B ) bounded by a second portion of said first line and a second portion of said second line which is smaller than said second portion of said first line with respect to the pulse amplitude, and wherein said blood-pressure-change identifying means (T9-16) comprises means for identifying an increase of the blood pressure of the subject when said second area is greater than said first area.
Claim 18
Dependent Claim
37 words
A blood pressure monitor apparatus according to claim 1, further comprising a pulse-wave detector (22, 24) which detects, as a pressure change produced in said cuff (10), an amplitude of each of said first and second pulses.
Claim 19
Dependent Claim
40 words
A blood pressure monitor apparatus according to claim 18, further comprising a cuff-pressure detector (20, 24) which detects a pressing pressure (Pc) of said cuff when said each of said first and second pulses is detected by said pulse-wave detector.
Claim 20
Dependent Claim
44 words
A blood pressure monitor apparatus according to claim 1, further comprising an output device (38) which informs a user of occurrence of an abnormal blood-pressure change when said blood-pressure-change identifying means (70, 172, 280) identifies said change of the blood pressure of the subject.
Claim 21
Dependent Claim
44 words
A blood pressure monitor apparatus according to claim 1, further comprising a blood-pressure re-measuring device (72) which immediately measures a new blood pressure of the subject when said blood-pressure-change identifying means (70, 172, 280) identifies said change of the blood pressure of the subject.
References Cited (Backward Citations)
JPS60241422A
Cited
JPS61103432A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.