USRE33834E - Heart-related parameters monitoring apparatus - Google Patents
Heart-related parameters monitoring apparatus Download PDFInfo
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- USRE33834E USRE33834E US07/556,101 US55610190A USRE33834E US RE33834 E USRE33834 E US RE33834E US 55610190 A US55610190 A US 55610190A US RE33834 E USRE33834 E US RE33834E
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- 238000012544 monitoring process Methods 0.000 title 1
- 230000035485 pulse pressure Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000004872 arterial blood pressure Effects 0.000 claims abstract description 14
- 230000035488 systolic blood pressure Effects 0.000 claims abstract description 13
- 230000035487 diastolic blood pressure Effects 0.000 claims abstract description 9
- 239000008280 blood Substances 0.000 claims description 200
- 210000004369 blood Anatomy 0.000 claims description 200
- 125000004122 cyclic group Chemical group 0.000 claims 36
- 230000000747 cardiac effect Effects 0.000 abstract description 4
- 230000036581 peripheral resistance Effects 0.000 abstract description 2
- 230000036772 blood pressure Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000000624 ear auricle Anatomy 0.000 description 1
- 210000001061 forehead Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 210000003371 toe Anatomy 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
- A61B5/029—Measuring or recording blood output from the heart, e.g. minute volume
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/02007—Evaluating blood vessel condition, e.g. elasticity, compliance
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
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- the invention relates to a non-invasive method of measuring arterial blood pressure and cardiac output.
- the invention also relates to an apparatus for carrying out the method.
- Non-invasive methods and apparatus for measuring arterial blood pressure and cardiac output are known in the art. Once such method and apparatus is illustrated in U.S. Pat. No. 4,030,485, Warner, issued June 21, 1977. A second such method and apparatus is taught in U.S. Pat. No. 4,418,700, Warner, issued Dec. 6, 1983. The present invention constitutes an improvement and refinement of the method and apparatus as taught in the latter patent.
- the invention relates to a non-invasive method, and an apparatus for determining heart-related parameters in patients.
- the method and apparatus determine pulse pressure, time constant of the arterial system, systolic and diastolic pressure, peripheral resistance, and cardiac output and means arterial blood pressure.
- FIG. 1 is a block diagram of the apparatus for carrying out the inventive method
- FIG. 2 is a typical sensor output of the system as illustrated in FIG. 1;
- FIG. 3 illustrates arterial blood pressure pulses
- FIGS. 4, 4a and 4b illustrate a blood volume pulse
- FIG. 5 illustrates a blood volume pulse and a blood pressure pulse to illustrate the ratio g
- FIG. 6 is a simplified flowchart for a computer program for performing calculations in accordance with the invention.
- an apparatus in accordance with the invention comprises a volume sensor such as a photo-electric plethysmograph S, an amplifier A 1 , an analog to digital converter A 2 , a microcomputer M and a display device D.
- the plethysmograph sensor S is attached to, for example, the earlobe of a subject.
- the sensor could also be attached to other suitable parts of the body such as the forehead, fingertips or toes.
- the plethysmograph detects changes in blood volume of the region to which it is attached.
- a typical sensor output signal is shown in FIG. 2. As seen in FIG. 2, the output signal has a pulsating component and a DC component.
- the output of the sensor is applied to the plethysmograph amplifier A 1 where it is amplified and filtered and the DC component is discarded.
- the output of A 1 has a DC component, but this is not directly related to the sensor DC component.
- the output of A 1 is fed to the analog to digital (A/D) converter A 2 which digitizes the signal.
- A/D analog to digital converter
- the sampling rate is 100 per second.
- Microcomputer M accepts signals from A 2 and processes them according to the instructions it contains. These instructions are schematically represented in the simplified flowchart of FIG. 6.
- the computer quantities are then displayed on a CRT monitor D or other suitable display means.
- Arterial blood pressure pulses are shown in FIG. 3. The shape of these curves vary according to the site where they are measured. The highest pressure reached during a cycle i is called the arterial systolic blood pressure, P si . The lowest pressure reached during the same cycle is called the arterial diastolic blood pressure, P di . The pressure rise from P di to p si in the same cycle is the pulse pressure, p pi .
- a plethysmographic pulse is shown in FIG. 4.
- the minimum value at the beginning of the pulse is V imin .
- the maximum value of the pulse is V imax .
- the time rate of volume change reaches a maximum V imax at time t iVm .
- the pulse volume at time t iVm is V iVm .
- V iVm In addition to finding the values of V iVm corresponding to V imax , see U.S. Pat. No. 4,418,700, Warner, values of V iVm are also found corresponding to V imax -1 , V imax -2 , . . . V imax -k , where k is a function of V imax .
- V iVm corresponding to the time rates of volume change lying between and including V imax and v imax -k are averaged and used to compute ⁇ V iVm .
- K pp constant determined by a first calibration
- r 1 constant . . . preferably equal to 0
- r 2 constant . . . preferably equal to 0
- K pp can be determined for each subject.
- ⁇ V iAV average value of ⁇ V i over the time interval T i
- variable g i can take on a constant value g 0 whose preferred value is 0.333.
- mean blood pressure can be determined using the following expression: ##EQU9## (for definition of r i see Equation 10 below);
- G(t) a function of t, in a particular case
- ⁇ c .[.(.].(1/ ⁇ t c ).[.).]. Y
- V imax maximum time rate of volume increase in cycle i
- V it time rate of increase of volume V i (t) at time t i
- ⁇ i current value of PP i .
- Equation (9) above is only one form which this particular equation can take.
- the invention may take two other forms as per (10) and (11) below. What follows is the manipulations as well as the two other forms of the equation:
- ⁇ 2i and ⁇ 1i can take on any values in satisfying the above equation (A)
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Abstract
A non-invasive method, and an apparatus, for determining heart-related parameters in patients. The method and apparatus determine pulse pressure, time constant of the arterial system, systolic and diastolic pressure, peripheral resistance, cardiac output and mean arterial blood pressure.
Description
This .Iadd.application is a reissue of application Ser. No. 105,803, filed Oct. 8, 1987, now U.S. Pat. No. 4,834,107, which .Iaddend.application is a continuation-in-part application Ser. No. 059,520, filed June 8, .Iadd.now abandoned .Iaddend. which is a continuation-in-part application Ser. No. 807,693, filed Dec. 11, 1985, now abandoned which is a continuation-in-part of parent application Ser. No. 608,955, filed May 10, 1984, now all abandoned.
1. Field of the Invention
The invention relates to a non-invasive method of measuring arterial blood pressure and cardiac output. The invention also relates to an apparatus for carrying out the method.
2. Description of Prior Art
Non-invasive methods and apparatus for measuring arterial blood pressure and cardiac output are known in the art. Once such method and apparatus is illustrated in U.S. Pat. No. 4,030,485, Warner, issued June 21, 1977. A second such method and apparatus is taught in U.S. Pat. No. 4,418,700, Warner, issued Dec. 6, 1983. The present invention constitutes an improvement and refinement of the method and apparatus as taught in the latter patent.
The invention relates to a non-invasive method, and an apparatus for determining heart-related parameters in patients. The method and apparatus determine pulse pressure, time constant of the arterial system, systolic and diastolic pressure, peripheral resistance, and cardiac output and means arterial blood pressure.
The invention will be better understood by an examination of the following description together with the accompanying drawings in which:
FIG. 1 is a block diagram of the apparatus for carrying out the inventive method;
FIG. 2 is a typical sensor output of the system as illustrated in FIG. 1;
FIG. 3 illustrates arterial blood pressure pulses;
FIGS. 4, 4a and 4b illustrate a blood volume pulse;
FIG. 5 illustrates a blood volume pulse and a blood pressure pulse to illustrate the ratio g; and
FIG. 6 is a simplified flowchart for a computer program for performing calculations in accordance with the invention.
As seen in FIG. 1, an apparatus in accordance with the invention comprises a volume sensor such as a photo-electric plethysmograph S, an amplifier A1, an analog to digital converter A2, a microcomputer M and a display device D. The plethysmograph sensor S is attached to, for example, the earlobe of a subject. The sensor could also be attached to other suitable parts of the body such as the forehead, fingertips or toes.
As is known, the plethysmograph, detects changes in blood volume of the region to which it is attached. A typical sensor output signal is shown in FIG. 2. As seen in FIG. 2, the output signal has a pulsating component and a DC component.
The output of the sensor is applied to the plethysmograph amplifier A1 where it is amplified and filtered and the DC component is discarded. The output of A1 has a DC component, but this is not directly related to the sensor DC component.
The output of A1 is fed to the analog to digital (A/D) converter A2 which digitizes the signal. In a preferred embodiment, the sampling rate is 100 per second.
Microcomputer M accepts signals from A2 and processes them according to the instructions it contains. These instructions are schematically represented in the simplified flowchart of FIG. 6.
The computer quantities are then displayed on a CRT monitor D or other suitable display means.
THEORY
Arterial blood pressure pulses are shown in FIG. 3. The shape of these curves vary according to the site where they are measured. The highest pressure reached during a cycle i is called the arterial systolic blood pressure, Psi. The lowest pressure reached during the same cycle is called the arterial diastolic blood pressure, Pdi. The pressure rise from Pdi to psi in the same cycle is the pulse pressure, ppi.
By definition
p.sub.si -p.sub.di =p.sub.pi (1)
To find Ppi
A plethysmographic pulse is shown in FIG. 4. The minimum value at the beginning of the pulse is Vimin. The maximum value of the pulse is Vimax. As the pulse volume rises from Vimin to Vimax, the time rate of volume change reaches a maximum Vimax at time tiVm. The pulse volume at time tiVm is ViVm.
let ##EQU1##
In addition to finding the values of ViVm corresponding to Vimax, see U.S. Pat. No. 4,418,700, Warner, values of ViVm are also found corresponding to Vimax -1, Vimax -2, . . . Vimax -k, where k is a function of Vimax.
All of the values of ViVm corresponding to the time rates of volume change lying between and including Vimax and vimax -k are averaged and used to compute ΔViVm.
The average value of ViV m is ##EQU2## where n0=number of values of ViV.sbsb.0 m corresponding to Vimax ##EQU3## nk=number of values of ViV.sbsb.k m corresponding to Vimax -k
k=(Vimax/m) (integral values only)+1
m=constant . . . a preferred value of m=20
l=constant . . . a preferred value of l=1 ##EQU4## Kpp =constant determined by a first calibration r1 =constant . . . preferably equal to 0
r2 =constant . . . preferably equal to 0
0≦α≦1
Ri1 can now be defined, as per equation (2) above, but using the average value of ViVm so that equation (2) can be rewritten ##EQU5##
From FIG. 4 ##EQU6## wherein
R'.sub.i =1-R.sub.i
or
R.sub.i =1-R'.sub.i
No other calibration should be required with different subjects. However, if desired, Kpp can be determined for each subject.
To find mean blood pressure
The mean blood pressure Pmi during a cycle i is given by ##EQU7## b3 =exponent . . . the preferred value of b3 is equal to 0.5 K4 =constant determined at calibration for each subject. It is only necessary to find this constant once for each subject. The measurements carried out at different times on the same subject do not require separate calibration
P0 =constant . . . preferred 25 mmHg ##EQU8## where gi =(ΔViAV /ΔVi)
ΔViAV =average value of ΔVi over the time interval Ti
P.sub.di =P.sub.si -P.sub.pi (8)
The variable gi can take on a constant value g0 whose preferred value is 0.333.
Alternatively, mean blood pressure can be determined using the following expression: ##EQU9## (for definition of ri see Equation 10 below); where
G(t)=a function of t, in a particular case,
G(t)=(φc /φi)
φc =.[.(.].(1/Δtc).[.).].Y
φi =.[.(.].(1/Δti).[.).].Y
Δtc =(Δt'iφc
Δti =Δt'iφ
where
.[.Tc =T at calibration.]. .Iadd.Δtc =Δt at calibration Δt'iφ (see FIG. 4B) .Iaddend.
.[.tc =t at calibration Δt'iφ.sbsb.c (see FIG. 4B).].
.[.φc =(Tc /tc)=(T/t) at calibration.]. .Iadd.φc =(1/Δt)y at calibration.Iaddend.
y=constant
The remainder of the terms in equation 5' are the same as similar terms in equation 5.
Determination of ratio R (FIG. 4b)
From FIG. 4b, the ratio R is
Ri =(ΔVit /ΔVi)
where
ΔVit =change in volume at predetermined time ti
ΔVi =total volume change during cycle i
ti =time such that Δti =KT Δt'iφ
KT =constant
Estimation of pulse pressure, PP ##EQU10## where PPi =pulse pressure=ps -Pd
Ps =systolic blood pressure
Pd =diastolic blood pressure
k=constant
K'T =constant ≃ KT
In FIG. 4B
Δ V'.sub.i =ΔV.sub.i -ΔV.sub.it ##EQU11## wherein from the above equation: ##EQU12## multiply numerator and denominator by e.sup.kPP i ##EQU13##
Determination of r
From FIG. 4
r.sub.i = (V.sub.imax /ΔV.sub.i)G(t)
where
Vimax =maximum time rate of volume increase in cycle i
ΔVi =total volume increase during cycle i
From FIG. 4b
.[.r.sub.i = (V.sub.it ΔV.sub.i)G(t).].
.Iadd.ri =(Vit /Vi)G(t) .Iaddend.
Vit =time rate of increase of volume Vi(t) at time ti
.[.ΔVi =total volume increase of volume during.]. .Iadd.ΔVi =total increase of volume during time interval Δtiφ.Iaddend.
Estimation of Mean Blood Pressure
(1) Pmi '=K1 ric a
K1 =calibration constant
Pmi '=(P.sub. s +Pd)/2-Po
Psi =systolic blood pressure, in cycle i
Pmi =(P.sub. s +Pd)/2
Pdi =diastolic blood pressure, in cycle i
a=constant
Po =constant
.[.(2) ekp mi=K2 Ric b.]. (2) .Iadd.ekp mi=K2 ric b .Iaddend.
where
K2 =constant (calibration)
b=constant ##EQU14## where Pmo =constant at calibration
φ1i +φ2i =PPi =pulse pressure during cycle i
k=constant
j=constant
solve equation by making LHS=RHS by varying φ1i and φ2i (φ2i =PPi -φ1i)
then
Psi =Pmo +φ2i +P0
Pdi =Pmo -φ1i +Po
Pmi =(P.sub. si +Pdi)/2
P0 =constant
ri =ratio of exponentials
K3 =coefficient (variable or constant)
Correction for ri
ri (corrected)=ric =ri em(φ.sbsp.o-φ.sbsp.i)
m=constant
φ0 =PPi at calibration
φi =current value of PPi.
Equation (9) above is only one form which this particular equation can take. By simple mathematical manipulations, the invention may take two other forms as per (10) and (11) below. What follows is the manipulations as well as the two other forms of the equation:
As above noted
φ.sub.2i +φ.sub.1i =PP.sub.i =P.sub.si -P.sub.di
φ.sub.2i +φ.sub.1i =(P.sub. si -P.sub.o)-(P.sub. di -P.sub.o)
Let
P'si =Psi -Po
p'di =Pdi -P0
φ2i +φ1i =P'si -P'di
add and subtract Pmo on RHS above
φ.sub.2i +φ.sub.1i =P'.sub.si -P.sub.mo +P.sub.mo -P'.sub.di (A)
φ2i and φ1i can take on any values in satisfying the above equation (A)
Put φ2i =P'si -Pmo
and φ1i =Pmo -P'di in equation (9)
then ##EQU15## simplifying the denominator ##EQU16##
To solve equation 11:
(1) Set P'di =P'si -PPi and solve for P'si
.Iadd.P'mi =(Psi +Pdi)/2-Po .Iaddend.
(2) Set P'si =P'di -PPi and solve for P'di
Although particular embodiments have been illustrated, this was for the purpose of describing, but not limiting, the invention. Various modifications, which will come readily to the mind of one skilled in the art, are within the scope of the invention as defined in the appended claims.
.Iadd.Pmi =(Psi +Pdi)/2 .Iaddend.
Claims (18)
1. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising;
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum aplitude, said maximum rate of change of said signal, said first difference, said second different, said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating calculates the magnitude of the pulse pressure parameter in accordance with the following expression; ##EQU17## wherein Ppi =pulse pressure during cycle i
Kpp =constant determined by a first calibration
r1 =constant
r2 =constant
Ril =(ΔViVm /ΔVi)
where ΔViVm =volume change at time tiVm during cycle i corresponding to maximum rate of volume change, Vimax
ΔVi =maximum volume change during cycle i
ΔtiVm =time interval from start of cycle i to time of maximum rate of volume change Vimax.
2. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising;
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby .Iadd.detect .Iaddend.said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum .[.aplitude,.]. .Iadd.amplitude, .Iaddend.said maximum rate of change of said signal, said first difference, said second .[.different,.]. .Iadd.difference, .Iaddend.said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating .[.calculates.]. .Iadd.calculates .Iaddend.the magnitude of the mean arterial blood pressure, Pmi parameter in accordance with the following expression: ##EQU18## where K4 =constant determined for each subject
b3 =constant
Pmmi =pseudo mean arterial blood pressure during cycle i
.[.Δi .]. .Iadd.ΔVi .Iaddend.=maximum volume change during cycle i ##EQU19##
3. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising;
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum .[.aplitude,.]. .Iadd.amplitude, .Iaddend.said maximum rate of change of said signal, said first difference, said second .[.different,.]. .Iadd.difference, .Iaddend.said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating calculates the magnitude of the systolic pressure (Psi) parameter in accordance with the following expression:
P.sub.si =P.sub.mi +(1-g.sub.0)P.sub. pi
wherein
g0 =constant.
4. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising:
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum .[.aplitude,.]. .Iadd.amplitude, .Iaddend.said maximum rate of change of said signal, said first difference, said second .[.different,.]. .Iadd.difference, .Iaddend.said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating calculates the magnitude of the systolic pressure (Psi) parameter in accordance with the following expression:
P.sub.si =P.sub.mi +(1-g.sub.i)P.sub. pi
wherein:
gi =(ΔViAV /ΔVi)
Ppi =pulse pressure during cycle i
ΔVi =represented by said first difference
ΔViAV =represented by the difference between said minimum amplitude and an amplitude equal to the average value of a pulse in a cycle i.
5. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising;
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood volume variation being .[.cycle.]. .Iadd.cyclic .Iaddend.in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum .[.aplitude,.]. .Iadd.amplitude, .Iaddend.said maximum rate of change of said signal, said first difference, said second .[.different,.]. .Iadd.difference, .Iaddend.said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating calculates the magnitude of the arterial blood pressure, Pmi parameter in accordance with the following expression: ##EQU20## where K4 =constant determined for each subject
b3 =constant
Pmmi =pseudo mean arterial blood pressure during cycle i
ΔVi =maximum volume change during cycle i ##EQU21## Po =constant where
G(t)=a function of t.
6. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the pulse pressure parameter in accordance with the following expression: ##EQU22## wherein Ppi =pulse pressure during cycle i
Kpp =constant determined by a first calibration
r1 =constant
r2 =constant
Ril =(ΔViVm /ΔVi)
where
.[.ΔViVm =volume change at time tiVm during cycle i corresponding to maximum rate of volume change, Vimax.].
.Iadd.ΔViVm =volume change at time tiVm during cycle i corresponding to maximum rate of volume change, Vimax .Iaddend.
ΔVi =maximum volume change during cycle i
ΔtiVm =time interval from start of cycle i to time of maximum rate of volume change Vimax.
7. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the mean .[.artial.]. .Iadd.arterial .Iaddend.pressure Pmi in accordance with the following expression: ##EQU23## where K4 =constant determined for each subject
b3 =constant
Pmmi =pseudo mean arterial blood pressure during cycle i
ΔVi =maximum volume change during cycle i
ΔVimax =maximum time rate of change of ΔVi =Vimax ##EQU24##
8. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the systolic pressure (Psi parameter in accordance with the following expression:
P.sub.si =P.sub.mi +(1-g.sub.0)P.sub. pi
wherein
g0 =constant.
9. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representive of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the systolic pressure (Psi) parameter in accordance with the following expression:
P.sub.si =P.sub.mi +(1-g.sub.i)P.sub. pi
wherein:
gi =(ΔViAV /ΔVi)
Ppi =pulse pressure during cycle i
ΔVi =represented by said first difference
ΔViAV =represented by the difference between said minimum amplitude and an amplitude equal to the average value of a pulse in a cycle i.
10. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the arterial blood pressure, Pmi parameter in accordance with the following expression: ##EQU25## where
K4 =constant determined for each subject
b3 =constant
Pmmi =pseudo mean arterial blood pressure during cycle i
ΔVi =maximum volume change during cycle i
ΔVimax =maximum time rate of change of Vi =Vimax
Po =constant
G(t)=a function of t and T.
11. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising:
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum .[.aplitude,.]. .Iadd.amplitude, .Iaddend.said maximum rate of change of said signal, said first difference, said second .[.different,.]. .Iadd.difference, .Iaddend.said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating calculates the magnitude of the pulse pressure parameter in accordance with the following expression: ##EQU26## wherein Ppi =pulse pressure during cycle i
Kpp =constant determined by a first calibration
r1 =constant
r2 =constant
Ri1 =ΔViVm /ΔVi
where
ΔViVm =volume change at preselected time tiVm during cycle i
ΔVi =maximum volume change during cycle i
ΔtiVm =time interval from start of cycle i to preselected time of tiVm.
12. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of .[.charge.]. .Iadd.change .Iaddend.of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the pulse pressure parameter in accordance with the following expression: ##EQU27## wherein Ppi =pulse pressure during cycle i
Kpp =constant determined by a first calibration
r1 =constant
r2 =constant
Ri1 =(ΔViVm /Vi)
where
ΔViVm =volume change at preselected time tiVm during cycle i
ΔVi =maximum volume change during cycle i
ΔtiVm =time interval from start of cylcle i to predetermined time of tiVm.
13. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising;
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second different, said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein the means for calculating calculates the magnitude of the mean pressure parameter in accordance with the following expression:
(1) P'mi =K1 ric a
where
K1 =calibration constant
.[.P'mi =(Ps +Pd)/2-Po.].
Psi =systolic blood pressure, in cycle i
.[.Pmi =(Ps +Pd)/2.].
Pdi =diastolic blood pressure, in cycle i
a=constant
Po =constant.
14. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal .[.representation.]. .Iadd.representative .Iaddend.of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of mean pulse pressure in accordance with the following expression:
.[.(1) Pmi =K1 ric a.].
.Iadd.(1) P'mi =Kl ric a .Iaddend.
where
K1 =calibration constant
.[.P'mi =(Ps +Pd)/2-Po.].
.Iadd.P'mi =(Psi +Pdi)/2-Po .Iaddend.
Psi =systolic blood pressure, in cycle i
.[.Pmi =(Ps +Pd)/2.].
.Iadd.Pmi =(Psi +Pdi)/2 .Iaddend.
Pdi =diastolic blood pressure, in cycle i
a=constant
Po =constant.
15. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising;
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second .[.different,.]. .Iadd.difference, .Iaddend.said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein the means for calculating calculates implicitly the magnitude of the mean pulse pressure in accordance with the following expression: ##EQU28## where Pmo =constant at calibration
φ1i +φ2i =PPi =pulse pressure during cycle i
k=constant
j=constant
Psi =Pmo +φ2i +Po
Pdi =Pmo -φ1i +Po
Pmi =(P.sub. si +Pdi)/2
Po =constant
ri =ratio of exponentials
K3 =coefficient (variable or constant).
16. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and the said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
wherein the means for calculating calculates implicitly the magnitude of mean pulse pressure in accordance with the following .[.expressure.]. .Iadd.expression.Iaddend.: ##EQU29## where Pmo =constant at calibration
φ1i +φ2i =PPi =pulse pressure during cycle i
k=constant
j=constant
.[.P2i =Pmo +φ2i +Po.].
.Iadd.Psi =Pmo +φ2i +Po .Iaddend.
Pdi =Pmo -φ1i +Po
Pmi =(P.sub. si +Pdi)/2
Po =constant
ri =ratio of exponentials
K3 =coefficient (variable or constant). .Iadd.
17. Apparatus for determining the magnitude of heart-related parameters in a patient;
comprising:
means for detecting blood volume, and thereby blood volume variation, in said patient, and for providing a signal representative of said blood volume, and thereby said blood volume variation;
said means for detecting being attachable to said patient to thereby detect said blood volume, and thereby said blood volume variation;
said blood variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said minimum amplitude and said maximum amplitude, a maximum rate of change of said signal being representative of the maximum rate of increase of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum rate of change of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
means for measuring said maximum amplitude; said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
means for calculating the magnitude of selected ones of said parameters, said means for calculating being connected to both said means for detecting and means for measuring;
wherein means for calculating calculates the magnitude of the pulse pressure parameter in accordance with the following expression; ##EQU30## where PPi =Pulse Pressure-- Ps -Pd
Ps =Systolic blood pressure
Pd =diastolic blood pressure
k=constant
K'=constant..Iaddend. .Iadd.
18. A method for determining the magnitude of heart-related parameters in a patient;
comprising:
detecting blood volume, and thereby blood volume variation, in said patient and providing a signal representative of said blood volume, and thereby said blood volume variation;
said blood volume variation being cyclic in nature whereby said signal comprises a cyclic curve having, in each cycle of variation, a variable slope, a maximum amplitude representative of the maximum amount of blood volume, a minimum amplitude representative of the minimum amount of blood volume, a first time interval between said maximum amplitude and said minimum amplitude, a maximum rate of change of said signal being representative of the maximum rate of change of blood volume, a second time interval between the minimum amplitude and the time of the maximum rate of change of said signal, a first difference in amplitude between said maximum amplitude and said minimum amplitude, a second difference in amplitude between the maximum amplitude and the amplitude at the time of maximum change of rate of said signal being representative of the difference in volume between the maximum amount of blood volume and the volume at the time of maximum rate of change of said blood volume, and a pulse repetition period;
measuring said maximum amplitude, said minimum amplitude, said maximum rate of change of said signal, said first difference, said second difference, said first time interval, and said second time interval; and
calculating the magnitude of the mean arterial pressure Pmi in accordance with the following expression: ##EQU31## where PPi =Pulse Pressure=Ps -Pd
Ps =Systolic blood pressure
Pd =Diastolic blood pressure
k=constant
K'=constant.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/556,101 USRE33834E (en) | 1984-05-10 | 1990-07-20 | Heart-related parameters monitoring apparatus |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US60895584A | 1984-05-10 | 1984-05-10 | |
US5952087A | 1987-06-08 | 1987-06-08 | |
US07/105,803 US4834107A (en) | 1984-05-10 | 1987-10-08 | Heart-related parameters monitoring apparatus |
US07/556,101 USRE33834E (en) | 1984-05-10 | 1990-07-20 | Heart-related parameters monitoring apparatus |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US5952087A Continuation-In-Part | 1984-05-10 | 1987-06-08 | |
US07/105,803 Reissue US4834107A (en) | 1984-05-10 | 1987-10-08 | Heart-related parameters monitoring apparatus |
Publications (1)
Publication Number | Publication Date |
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USRE33834E true USRE33834E (en) | 1992-03-03 |
Family
ID=27490065
Family Applications (1)
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US07/556,101 Expired - Lifetime USRE33834E (en) | 1984-05-10 | 1990-07-20 | Heart-related parameters monitoring apparatus |
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US (1) | USRE33834E (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994010903A1 (en) * | 1992-11-18 | 1994-05-26 | Kunig Horst E | Measuring myocardial impairment, dysfunctions, and sufficiency/insufficiency |
US5365924A (en) * | 1992-07-31 | 1994-11-22 | Frederick Erdman Association | Method and apparatus for non-invasive cardiovascular diagnosis |
WO1995016391A1 (en) * | 1993-12-17 | 1995-06-22 | Pulse Metric, Inc. | Method and apparatus for treating cardiovascular pathologies |
US5542421A (en) * | 1992-07-31 | 1996-08-06 | Frederick Erdman Association | Method and apparatus for cardiovascular diagnosis |
US5865755A (en) * | 1996-10-11 | 1999-02-02 | Dxtek, Inc. | Method and apparatus for non-invasive, cuffless, continuous blood pressure determination |
US20050171446A1 (en) * | 1999-02-02 | 2005-08-04 | Transonic Systems, Inc | Method and apparatus for determining a blood flow during a vascular access dysfunction corrective procedure |
WO2010072416A1 (en) * | 2008-12-23 | 2010-07-01 | Charite-Universitätsmedizin Berlin | Method and device for monitoring and improving arteriogenesis |
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US4030485A (en) * | 1974-11-12 | 1977-06-21 | Glenfield Warner | Method and apparatus for continuously monitoring systolic blood pressure |
GB2092309A (en) * | 1981-01-29 | 1982-08-11 | Bard Inc C R | Blood Pressure Measurement |
US4425920A (en) * | 1980-10-24 | 1984-01-17 | Purdue Research Foundation | Apparatus and method for measurement and control of blood pressure |
-
1990
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US4030485A (en) * | 1974-11-12 | 1977-06-21 | Glenfield Warner | Method and apparatus for continuously monitoring systolic blood pressure |
US4425920A (en) * | 1980-10-24 | 1984-01-17 | Purdue Research Foundation | Apparatus and method for measurement and control of blood pressure |
GB2092309A (en) * | 1981-01-29 | 1982-08-11 | Bard Inc C R | Blood Pressure Measurement |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5365924A (en) * | 1992-07-31 | 1994-11-22 | Frederick Erdman Association | Method and apparatus for non-invasive cardiovascular diagnosis |
US5542421A (en) * | 1992-07-31 | 1996-08-06 | Frederick Erdman Association | Method and apparatus for cardiovascular diagnosis |
WO1994010903A1 (en) * | 1992-11-18 | 1994-05-26 | Kunig Horst E | Measuring myocardial impairment, dysfunctions, and sufficiency/insufficiency |
WO1995016391A1 (en) * | 1993-12-17 | 1995-06-22 | Pulse Metric, Inc. | Method and apparatus for treating cardiovascular pathologies |
CN1123319C (en) * | 1993-12-17 | 2003-10-08 | 脉冲度量股份有限公司 | Method and apparatus for treating cardiovascular pathologies |
US5865755A (en) * | 1996-10-11 | 1999-02-02 | Dxtek, Inc. | Method and apparatus for non-invasive, cuffless, continuous blood pressure determination |
US20050171446A1 (en) * | 1999-02-02 | 2005-08-04 | Transonic Systems, Inc | Method and apparatus for determining a blood flow during a vascular access dysfunction corrective procedure |
US6986744B1 (en) | 1999-02-02 | 2006-01-17 | Transonic Systems, Inc. | Method and apparatus for determining blood flow during a vascular corrective procedure |
WO2010072416A1 (en) * | 2008-12-23 | 2010-07-01 | Charite-Universitätsmedizin Berlin | Method and device for monitoring and improving arteriogenesis |
US10413195B2 (en) | 2008-12-23 | 2019-09-17 | Ivo Buschmann | Method and device for monitoring and improving arteriogenesis |
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