Blood pressure measuring device and a method of controlling the cuff pressure in a blood pressure measuring device
First Claim
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1. A blood pressure measuring device comprising:
- a cuff which in use is wrapped around a part of the patient'"'"'s body;
a pressure adjustment device for controlled filling and emptying of the cuff;
a flow sensor arranged between said pressure adjustment device and said cuff;
an integration means connected to be responsive to said flow sensor for producing a volume value; and
a control means for controlling the pressure adjustment device on the basis of the volume value produced by said integration means as well as on the basis of at least one quantity representative of a pressure/volume dependence of a cuff pressure on a cuff-filling volume.
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Abstract
For controlling the cuff pressure in a blood pressure measuring device, the volume flow between a pump for filling the cuff and a valve for emptying the cuff on the one hand and the cuff on the other hand is detected by a flow sensor whose output signal is integrated by means of an integration circuit for producing an actual volume value. A computer unit for controlling the pump and the valve produces the control signals on the basis of this volume value formed by integration as well as on the basis of at least one quantity representative of the pressure/volume dependence of the cuff pressure.
28 Citations
18 Claims
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1. A blood pressure measuring device comprising:
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a cuff which in use is wrapped around a part of the patient'"'"'s body; a pressure adjustment device for controlled filling and emptying of the cuff; a flow sensor arranged between said pressure adjustment device and said cuff; an integration means connected to be responsive to said flow sensor for producing a volume value; and a control means for controlling the pressure adjustment device on the basis of the volume value produced by said integration means as well as on the basis of at least one quantity representative of a pressure/volume dependence of a cuff pressure on a cuff-filling volume. - View Dependent Claims (2, 3, 4, 5)
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6. A blood pressure measuring device comprising:
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a cuff which in use is wrapped around a part of the patient'"'"'s body; a pressure generation device for filling or for venting the cuff; a pressure sensor for producing a pressure signal; a valve for controlled emptying of the cuff; a flow sensor arranged between the cuff on the one side and the pressure generation device as well as the valve on the other side; an integration means connected to be responsive to said flow sensor for producing a volume value and a control means connected to the valve, the pressure sensor and the integration means and having a structural design of such a nature that it; (a) determines at least one quantity representative of a pressure/volume function on the basis of the pressure signal and the volume valve; (b) calculates a target volume value on the basis of a target pressure value for a respective pressure step and on the basis of said quantity representative of the pressure/volume function; and (c) supplies to the valve a control signal for emptying the cuff until an actual volume value received from the integration means corresponds to the calculated target volume value. - View Dependent Claims (7, 8, 9, 10)
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11. A method of controlling cuff pressure in a blood pressure measuring device to be used on a patient, the blood pressure measuring device including:
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a cuff which in use is wrapped around a part of the patient'"'"'s body; a pressure adjustment device for controlled filling and emptying of the cuff; a flow sensor connected between said pressure adjustment device and said cuff; and an integration means responsive to said flow sensor for producing a volume value; the method comprising; controlling said pressure adjustment device on the basis of the volume value produced by said integration means and on the basis of at least one quantity representative of a pressure/volume dependence of the cuff pressure on a cuff-filling volume. - View Dependent Claims (12, 13, 14)
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15. A method of controlling the cuff pressure in a blood pressure measuring device used on a patient, the blood pressure measuring device including:
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a cuff which in use is wrapped around a part of the patient'"'"'s body; a pressure generation device for filling or for venting the cuff; a pressure sensor for producing a pressure signal; a valve for controlled emptying of the cuff; a flow sensor connected on one side between the cuff and the pressure generation device as well as the valve on its other side; an integration means responsive to said flow sensor used for producing a volume value, and a control means connected to the valve, the pressure sensor and the integration means, said method comprising the steps of; determining at least one quantity representative of a pressure/volume function; calculating a target volume value on the basis of a target pressure value for a respective pressure step; and opening the valve to empty the cuff until an actual volume value received from the integration means corresponds to the calculated target volume value. - View Dependent Claims (16, 17, 18)
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Specification