Method and apparatus for measuring the flow resistance of a catheter in an implanted medication infusion system
US5544519A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Oct 20, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2209/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for measuring the flow resistance of a catheter in an implanted medication infusion system, the system having a medication reservoir and a pump that conveys the medication from the reservoir into the patient through a catheter connected to the discharge of the pump via a one-way valve, and having a rinsing input for direct access to the catheter disposed upstream of the catheter and downstream of the pump, the time required in order to pump a pre-determined liquid volume through the catheter via the rinsing input at a predetermined pressure is measured. In a device for such a flow check, a testing device is provided for connection to the rinsing input, which pumps a predetermined liquid volume through the catheter via the rinsing input at a predetermined pressure. Measuring sensors are provided for supplying signals from which the time required for pumping this liquid volume can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.