External blood pressure sensor apparatus and method
US5833619A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1997 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | May 15, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M60/274
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus and method for measuring the blood pressure of a patient with a permanent or temporary cardiac assist device throughout an entire cardiac cycle by partially filling the inflatable chamber of the cardiac assist device operatively disposed with respect to an aorta with pressurized fluid and using the partially filled chamber as a transducer. An external pressure sensor is located in a drive unit connected to the inflatable chamber. The drive unit controls, monitors and stores the fluid pressure with respect to the inflatable chamber. When isolated from a pressurized fluid reservoir, the pressure within the inflatable chamber corresponds to the current blood pressure of the patient throughout the cardiac cycle. The inflatable chamber preferably is defined at least in part by a flexible membrane. The inflatable chamber is partially inflated with a predetermined volume of pressurized fluid from the reservoir. The partially inflated chamber is then isolated from the reservoir for at least one complete cardiac cycle, and preferably two complete cardiac cycles. The blood pressure wave form of the patient is continuously monitored and stored by measuring the pressure variations…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.