Method and apparatus for measuring the flow resistance of a catheter in an implanted medication infusion system
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Oct 20, 1994
filing date -
Oct 22, 1993
priority date (Note) -
Expired
status (Latency Note)
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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.
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