Ambulatory infusion devices and methods including occlusion monitoring
First Claim
Patent Images
1. A method of monitoring an infusion device including a pump and an outlet, the method comprising the steps of:
- sensing pressure within a catheter connected to the outlet prior to a single pump stroke;
sensing pressure within the catheter during the single pump stroke; and
determining that the catheter is blocked in response to an increase in pressure within the catheter, as compared to the pressure within the catheter sensed prior to the single pump stroke, that is measured during the single pump stoke between positive and negative pressure events associated with the single pump stoke.
9 Assignments
0 Petitions
Accused Products
Abstract
Infusion devices with blockage detection capability and methods of monitoring infusion devices. High resolution pressure sensing and/or the sensing of a reflected pressure event may be used to detect a blockage.
42 Citations
29 Claims
-
1. A method of monitoring an infusion device including a pump and an outlet, the method comprising the steps of:
-
sensing pressure within a catheter connected to the outlet prior to a single pump stroke; sensing pressure within the catheter during the single pump stroke; and determining that the catheter is blocked in response to an increase in pressure within the catheter, as compared to the pressure within the catheter sensed prior to the single pump stroke, that is measured during the single pump stoke between positive and negative pressure events associated with the single pump stoke. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An infusion device, comprising:
-
an outlet port; a fluid transfer device operably connected to the outlet port; a fluid path defining a frequency; a pressure sensor associated with the fluid path located between the fluid transfer device and the outlet port; and means for taking samples of the pressure sensed by the pressure sensor at at least twice the frequency of the fluid path. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. An infusion device, comprising:
-
an outlet port; a fluid transfer device operably connected to the outlet port; a pressure sensor located between the fluid transfer device and the outlet port; and a controller that takes samples of the pressure sensed by the pressure sensor at a rate of at least about 400,000 samples/second. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
-
22. A method of monitoring an infusion device including an infusion device outlet and a piston pump, the piston pump including a piston that moves back and forth, a cycle of the back and forth movement defining a pump stroke that has a beginning and an end, the method comprising the steps of:
-
sensing pressure with a sensor located at a sensing location between the piston pump and a catheter outlet of a catheter connected to the infusion device outlet prior to the beginning of a single pump stroke of the piston pump; sensing pressure with the sensor located at the sensing location during the single pump stroke of the piston pump; and determining that the catheter is blocked in response to an increase in pressure at the sensing location, as compared to the pressure at the sensing location sensed prior to the beginning of the single pump stroke of the piston pump, that is measured after the beginning and prior to the end of the single pump stroke of the piston pump. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
-
Specification