Noninvasive blood pressure measuring method and apparatus
First Claim
1. A method for non-invasively measuring arterial blood pressure at a wrist of a patient, said method comprising the steps of:
- a) keeping a wrist of a patient at a posture which lowers a position of at least one tendon of the wrist near to a radial artery to be measured, and causes the radial artery to be close to a radius of the wrist;
b) applying a changing external pressure to the skin above a point where the radial artery crosses a most protuberant spot on a volar aspect of the radius of the wrist;
c) detecting a pulse wave signal of the radial artery along with a change in said external pressure on the skin above said point;
d) measuring blood pressure of the radial artery by measuring said external pressure applied to the radial artery when said pulse wave signal changes.
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Accused Products
Abstract
A method and a device for non-invasive blood pressure measurement wherein the angle between the hand and the wrist, and the turning angle of the wrist relative to the middle part of the forearm, are kept to the most suitable degree for measuring the blood pressure of the radial artery. At least one pressure bladder and one arterial pulse transducer array are placed on the skin over the radial artery of the wrist to apply the external pressure to the artery and to detect the change of the arterial pulse signals. This method and device can correctly measure the intermittent or continuous blood pressure of the radial artery or the ulnar artery based on the principles of oscillation method and volume compensation method, and effectively eliminate the influence on the measurement due to body movement and the influence on blood circulation and neural function of the hand caused by long-term blood pressure measurement.
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Citations
32 Claims
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1. A method for non-invasively measuring arterial blood pressure at a wrist of a patient, said method comprising the steps of:
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a) keeping a wrist of a patient at a posture which lowers a position of at least one tendon of the wrist near to a radial artery to be measured, and causes the radial artery to be close to a radius of the wrist;
b) applying a changing external pressure to the skin above a point where the radial artery crosses a most protuberant spot on a volar aspect of the radius of the wrist;
c) detecting a pulse wave signal of the radial artery along with a change in said external pressure on the skin above said point;
d) measuring blood pressure of the radial artery by measuring said external pressure applied to the radial artery when said pulse wave signal changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for non-invasively measuring arterial blood pressure at a wrist of a patient comprising:
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a) a wrist holding device including a support board, wherein said support board is shaped to adapt to a flexing angle of between approximately 100 and 170 degrees between a dorsal side of the wrist and a dorsal side of a hand attached to the wrist and a turning angle of between approximately 30 and 100 degrees of the wrist relative to the forearm attached to the wrist towards a medial side of the patient'"'"'s body;
b) a pressure bladder for applying an external pressure to the radial artery, wherein said pressure bladder comprises a compressing wall adapted to face the skin above the radial artery of the wrist;
c) a pressure bladder holding device for stably positioning said pressure bladder on the skin above a point where the radial artery crosses a most protuberant spot on a volar aspect of the radius of the wrist;
d) a pulse transducer for detecting a pulse wave signal of the radial artery; and
e) a pressure feeding-measuring system connected to said pressure bladder and said pulse transducer;
said pressure feeding-measuring system including a pressure feeding device for feeding pressure to said pressure bladder, and a signal processing device for processing the detected pulse wave signal of the radial artery and controlling said pressure feeding device, so as to measure blood pressure of the radial artery by measuring said external pressure applied to the radial artery when the detected pulse wave signal of the radial artery changes. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification