Blood pressure measurement
AssigneeWelch Allyn, Inc.
InventorsDavid Quinn, Matthew Kinsley, Tyson Whitaker
Life of this patent
Estimating the term…
Abstract
The diastolic blood pressure and a systolic blood pressure of a vertebrate are measured using an inflatable pressure cuff disposed about a limb of the vertebrate and connected to an inflation device through a single conduit. A pressure sensor is pneumatically connected to the cuff through the same common conduit. The sensed pressures at the diastolic and systolic points are corrected for a pressure differential associated with the flow of an inflation fluid through the common conduit. The sensed pressures at the diastolic point and the systolic point may be measured during inflation of the cuff or during controlled deflation of the cuff.
Claims31
A method for determining blood pressure in an artery of a vertebrate at a diastolic point and at a systolic point using an inflatable pressure cuff disposed about a limb of the vertebrate and connected to an inflation device and a pressure sensor through a single conduit having a distal end in fluid communication with said cuff and a proximal end in fluid communication with said inflation device and in pneumatic communication with said pressure sensor, comprising the steps of:
- inflating said cuff by passing a flow of an inflation fluid through said single conduit;
- sensing fluid pressure within the proximal end of said conduit at the diastolic point and at the systolic point;
- determining a pressure differential between said cuff and said pressure sensor at the diastolic point and a pressure differential between said cuff and said pressure sensor at the systolic point;
- and
- correcting the sensed pressure at the diastolic point for the pressure differential at the diastolic point and correcting the sensed pressure at the systolic point for the pressure differential at the systolic point.
A method for determining blood pressure in an artery of a vertebrate at a diastolic point and at a systolic point using an inflatable pressure cuff disposed about a limb of the vertebrate and connected to an inflation device and a pressure sensor through a single conduit having a distal end in fluid communication with said cuff and a proximal end in fluid communication with said inflation device and in pneumatic communication with said pressure sensor, comprising the steps of:
- inflating said cuff by passing a flow of an inflation fluid through said single conduit;
- sensing fluid pressure within the proximal end of said conduit at the diastolic point and at the systolic point during the step of inflating said cuff;
- terminating the inflation of said cuff at a selected measurement point;
- measuring the pressure differential existing between said pressure sensor and said cuff at termination of the cuff inflation process;
- calculating the respective pressure differentials between said pressure sensor and said cuff associated with the sensed pressures at the diastolic and systolic points as a function of the measured pressure differential;
- and
- correcting the sensed pressures at the diastolic and systolic points by subtracting the calculated diastolic pressure differential from the sensed pressure at the diastolic point and subtracting the calculated systolic pressure differential from the sensed pressure at the systolic point.
A method for determining blood pressure in an artery of a vertebrate at a diastolic point and at a systolic point using an inflatable pressure cuff disposed about a limb of the vertebrate and connected to an inflation device and a pressure sensor through a single conduit having a distal end in fluid communication with said cuff and a proximal end in fluid communication with said inflation device and in pneumatic communication with said pressure sensor, comprising the steps of:
- inflating said cuff by passing a flow of an inflation fluid from said inflation device through said conduit;
- terminating the inflation of said cuff at a pressure exceeding the systolic point;
- deflating said cuff by venting a flow of the inflation fluid from said cuff through said conduit;
- measuring the pressure differential existing between said cuff and said pressure sensor at a selected measurement point during the step of deflating said cuff;
- sensing fluid pressure within the proximal end of said conduit at the diastolic point and at the systolic point during the cuff deflation step;
- calculating the respective pressure differentials between said pressure sensor and said cuff associated with the sensed pressures at the diastolic and systolic points as a function of the measured pressure differential;
- and
- correcting the sensed pressures at the diastolic and systolic points by adding the calculated diastolic pressure differential from the sensed pressure at the diastolic point and subtracting the calculated systolic pressure differential from the sensed pressure at the systolic point.
Dependencies are inferred from the claim text.