Pressure-compensated fluid administering apparatus
First Claim
1. A pressure sensing system for monitoring pressure in a first column of fluid which is closed and under a pressure to be measured, said system including a pressure sensing device having first and second major surfaces, said first surface communicating at a first end with the fluid in said first column, said system including a second column of fluid, said second surface communicating with said second column, and means for maintaining the heights of said first and second columns equal to one another.
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Accused Products
Abstract
Patient pressure monitoring systems require constant monitoring and adjustment by patient care specialists because of erroneous indications of changes in blood pressure readings which occur is such systems. The changes are due to errors produced by the sensing system caused by patient movement with respect to the pressure sensor. Such erroneous changes are eliminated by the addition of a second fluid path which is maintained at atmospheric pressure and controllably is connected to the prime fluid path to normalize any change in pressure in the prime path due to changes in relative positions of the sensor and the patient.
59 Citations
11 Claims
- 1. A pressure sensing system for monitoring pressure in a first column of fluid which is closed and under a pressure to be measured, said system including a pressure sensing device having first and second major surfaces, said first surface communicating at a first end with the fluid in said first column, said system including a second column of fluid, said second surface communicating with said second column, and means for maintaining the heights of said first and second columns equal to one another.
- 4. A pressure monitoring system for patient end use, said system comprising a first fluid column for delivering fluids to said patient, said fluid column being connected to a pressure sensor at a proximal end thereof and being adapted at a distal end thereof to mate with a needle for connection to said patient, said system including a second column, said second column also containing fluid and communicating with said first column, said second column also including means for maintaining atmospheric pressure therein for normalizing any pressure changes in said first column, said pressure sensor having first and second surfaces communicating with the fluid in said first and second columns respectively.
- 9. A system for monitoring the pressure of fluid in a tube connected between a pressurized fluid source and a patient, said system comprising said fluid source, a tube connected to said fluid source at a proximal end thereof and to a needle at the distal end thereof for inter vascular connection to said patient, said tube including first valve means for interrupting fluid flow in said tube, said system also including a second tube, said second tube including a second valve means for interrupting fluid flow in said second tube, said second tube also including means at the distal end thereof for maintaining fluid in said second tube at atmospheric pressure and control means at the proximal end thereof for controllably interconnecting said second path to said first path, said system including pressure sensing means having first and second surfaces exposed to fluid in said first and second tubes respectively.
Specification