Pump diagnostic system
First Claim
1. A system for evaluating operation of an in-vivo medication delivery device having a medication reservoir with a fluid therein for delivery, a separate access port and an outlet in fluid communication thereto comprising:
- means for detaining ambient pressure,means for determining an in-vivo pressure in said reservoir,means for determining a pressure in said medication delivery device at a posit in a flow path of said fluid downstream of said reservoir, andmeans receiving values representative of said in-vivo pressure, said pressure downstream of said reservoir and ambient pressure to determine whether said medication delivery device is functioning within predetermined limits.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus to evaluate the performance of an implanted medication delivery device such as pumps and ports is described. In the case of a pump, the system measures ambient pressure and obtains two pressure measurements from the implanted device. One of these measurements is device reservoir pressure and the other is based on a disturbance pulse injected into the system at a point downstream of the reservoir. Based on those measurements and input calibration data, an expected flow rate is determined. The expected flow rate together with device refill data is in turn used to determine a normalized flow rate for the in-vivo device. Determinations are then made as to the performance of the reservoir, its pump and the condition of the outlet catheter without explant of the device. In the case of a port, the system measures the catheter resistance based on decay time of a disturbance pulse.
169 Citations
22 Claims
-
1. A system for evaluating operation of an in-vivo medication delivery device having a medication reservoir with a fluid therein for delivery, a separate access port and an outlet in fluid communication thereto comprising:
-
means for detaining ambient pressure, means for determining an in-vivo pressure in said reservoir, means for determining a pressure in said medication delivery device at a posit in a flow path of said fluid downstream of said reservoir, and means receiving values representative of said in-vivo pressure, said pressure downstream of said reservoir and ambient pressure to determine whether said medication delivery device is functioning within predetermined limits. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of evaluating operation of an in-vivo medication delivery device having a medication reservoir having a fluid for delivery in-vivo, an access port and an outlet in fluid communication thereto, comprising the steps of:
-
determining, ambient pressure, in-vivo reservoir pressure and in-vivo pressure in said delivery device at a point downstream of said reservoir, and evaluating, based on the determined pressures, whether said in-vivo device is functioning within predetermined limits. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A method of determining whether an implanted medication delivery device is functioning within predetermined limits comprising the steps of measuring ambient pressure:
-
determining a normalized flow rate for said device based on in-vivo pressure measurements, calibration data and device refill data, and determining, without explant of said device, whether said device requires refill or has malfunctioned. - View Dependent Claims (16, 17)
-
-
18. A method of determining whether an implanted medication delivery device is functioning within normal limits comprising the steps of measuring ambient pressure:
-
measuring a flow resistance based on in-vivo measurements, and determining, without explant of said device, whether said device is dispensing medication within predetermined limits. - View Dependent Claims (19, 20)
-
-
21. A system for evaluating operating of an in-vivo medication delivery device having an access port and an outlet comprising:
-
means in fluid communication with said device for determining a steady state in-vivo pressure in said device, means in fluid communication with said device for generating a pressure disturbance pulse in said device and determining a decay time thereof, and means responsive to said means for determining a steady state in-vivo pressure and said means for generating a pressure disturbance for determining whether said device is functioning within predetermined limits. - View Dependent Claims (22)
-
Specification