Rapid non-invasive blood pressure measuring device
First Claim
1. An apparatus comprising:
- a device for applying external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; and
a processor adapted to identify an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time, the arterial pressure at said first time not being a systolic or diastolic arterial pressure, the processor further adapted to determine the arterial pressure at a specific time.
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Accused Products
Abstract
A blood pressure can be obtained by supplying an external pressure to a portion of an artery. The external pressure is preferably between the systolic and diastolic pressure. An event which occurs at least once a cycle can then be identified. This event can be, for example, a peak in the arterial compliance that occurs at a transmural pressure approximately equal to zero. A pair of signals, one that is an arterial volume-indicating signal, and one that is an arterial pressure-indicating signal can be used to identify this event. Alternately, a small signal high-frequency exciter component can be placed upon the pressure or volume of the artery and detected to determine the time that the transmural pressure is equal to zero.
1104 Citations
89 Claims
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1. An apparatus comprising:
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a device for applying external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; and a processor adapted to identify an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time, the arterial pressure at said first time not being a systolic or diastolic arterial pressure, the processor further adapted to determine the arterial pressure at a specific time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An apparatus comprising:
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a device for applying external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; a processor adapted to identify an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time, the processor further adapted to determine the arterial pressure at a specific time; and an exciter to induce an oscillating component having a frequency greater than the pulsatile frequencies. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. A method of determining arterial pressure, comprising:
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applying an external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; identifying an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time, the arterial pressure at said first time not being a systolic or diastolic arterial pressure; and determining the arterial pressure at a specific time. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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71. A method of determining arterial pressure, comprising:
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applying an external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; inducing an oscillating component having a frequency greater than the pulsatile frequencies; identifying an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time; and determining the arterial pressure at a specific time. - View Dependent Claims (72, 73, 74, 75, 76, 77)
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78. An apparatus comprising:
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a device for applying external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle, the device applying a substantially constant external pressure to the artery over the measurement period; and a processor adapted to identify an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time, the processor further adapted to determine the arterial pressure at a specific time, wherein the processor is adapted to determine said first time that the event occurs without requiring data from outside the measurement period. - View Dependent Claims (79, 80, 81, 82)
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83. A method of determining arterial pressure comprising:
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applying an external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle, a substantially constant external pressure being applied over a measurement period; identifying an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time; and determining the arterial pressure at a specific time without requiring data from outside the measurement period. - View Dependent Claims (84, 85, 86, 87)
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88. An apparatus comprising:
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a device for applying external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; and a processor adapted to identify an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time, the processor further adapted to determine the arterial pressure at a specific time, the processor being adapted to determine the arterial pressure at the specific time without requiring data from outside the cardiac cycle.
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89. A method of determining arterial pressure, comprising:
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applying an external pressure to an artery, the external pressure being such that the artery experiences a range of transmural pressures within a cardiac cycle; identifying an event occurring at a transmural pressure in said range of transmural pressures, the event being associated with a first time; and determining the arterial pressure at a specific time without requiring data from outside the cardiac cycle.
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Specification