Method and arrangement for measuring blood pressure
DCFirst Claim
1. A method of measuring blood pressure of a subject including the steps of:
- occluding blood flow in a body member by applying a pressure force to said body member, said application step including the step of changing said pressure force between a level whereat said blood flow is substantially occluded and a level whereat said blood flow is substantially unoccluded;
monitoring said pressure applying said pressure force during said change in levels, including detecting variations in said pressures induced by blood pressure pulses;
analyzing the shape of each wave form constituted by said pressure variations over the enitre course of each blood pressure pulse, including the step of calculating a wave form index value providing a quantitative indicator of the shape of said wave form;
analyzing the changes in the wave form index values produced by successive changes in pressure applied in said occluding step;
detecting a change in slope in the successive changes of said wave form index values at said pressure level corresponding to unoccluded blood flow;
determining the average pressure monitored by said monitoring step at said pressure level, whereby the pressure level corresponding to diastolic blood pressure is measured.
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Abstract
A method and arrangement for the indirect measurement of systolic and diastolic blood pressure is disclosed which involves applying an occluding inflatable cuff to a body member, with the pressure applied thereby being cycled between a pressure greater than systolic and a pressure less than diastolic. Systolic blood pressure is detected by sensing the point in the pressure cycle at which the blood flow in the occluded member shifts between a flow and no flow condition, while diastolic blood pressure is detected by sensing a characteristic change in slope of blood pulse wave form changes occurring with changing cuff pressures which occurs at a cuff pressure equal to the diastolic pressure. An approach for correcting the systolic and diastolic pressure measurements obtained by this method at one point of the body to give equivalent readings of the systolic and diastolic blood pressure at another point is also disclosed.
60 Citations
18 Claims
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1. A method of measuring blood pressure of a subject including the steps of:
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occluding blood flow in a body member by applying a pressure force to said body member, said application step including the step of changing said pressure force between a level whereat said blood flow is substantially occluded and a level whereat said blood flow is substantially unoccluded; monitoring said pressure applying said pressure force during said change in levels, including detecting variations in said pressures induced by blood pressure pulses; analyzing the shape of each wave form constituted by said pressure variations over the enitre course of each blood pressure pulse, including the step of calculating a wave form index value providing a quantitative indicator of the shape of said wave form; analyzing the changes in the wave form index values produced by successive changes in pressure applied in said occluding step; detecting a change in slope in the successive changes of said wave form index values at said pressure level corresponding to unoccluded blood flow; determining the average pressure monitored by said monitoring step at said pressure level, whereby the pressure level corresponding to diastolic blood pressure is measured. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An arrangement for measuring blood pressure in a subject comprising:
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means for occluding blood flow in a body member, including means for applying a pressure force to said body member, said means further including means for changing said pressure force between a level wherein said blood flow is substantially occluded and a level wherein blood flow is substantially unoccluded; means for monitoring said pressure force, during said change in levels, including means for detecting variations in said pressures induced by blood pressure pulses; means analyzing the shape of each wave form constituted by said pressure variations over the entire course of each blood pressure pulse, said means including means producing a wave form index value signal providing a quantitative indicator value signal corresponding to the shape of said wave form; means analyzing the changes in wave form index signal values produced by successive changes in pressure applied by said occluding means; means for detecting a change in slope in the successive changes of said wave form index signal values at said pressure level corresponding to unoccluded blood flow; means for determining the average pressure monitored by said monitoring means at said pressure level, whereby said pressure level corresponding to diastolic pressure is measured. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of measuring blood pressure of a subject including the steps of:
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occluding blood flow in a body member by applying a pressure force to said body member, said application step including the step of changing said pressure force between a level whereat said blood flow is substantially occluded and a level whereat said blood flow is substantially unoccluded; monitoring said pressure applying said pressure force during said change in levels, including detecting variations in said pressures induced by blood pressure pulses; analyzing each wave form constituted by said pressure variations over the entire course of each blood pressure pulse; analyzing the changes in the wave form of said pressure variations produced by successive changes in pressure applied in said occluding step; detecting a change in the successive changes of said wave form at said pressure level corresponding to unoccluded blood flow; determining the average pressure monitored by said monitoring step at said pressure level, whereby the pressure level corresponding to diastolic blood pressure is measured.
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18. An arrangement for measuring blood pressure in a subject comprising:
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means for occluding blood flow in a body member, including means for applying a pressure force to said body member, said means further including means for changing said pressure force between a level wherein said blood flow is substantially occluded and a level wherein blood flow is substantially unoccluded; means for monitoring said pressure force, during said change in levels, including means for detecting variations in said pressures induced by blood pressure pulses; means analyzing each wave form constituted by said pressure variations over the entire course of each blood pressure pulse; means analyzing the changes in wave form of said pressure variations produced by successive changed in pressure applied by said occluding means; means for detecting a change in the successive changes of said wave form at said pressure level corresponding to unoccluded blood flow; means for determining the average pressure monitored by said monitoring means at said pressure level, whereby said pressure level corresponding to diastolic pressure is measured.
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Specification