MEDICAL DEVICE FOR INJECTING LIQUID
First Claim
1. A method for injecting liquid under pressure to a patient, the method comprising:
- providing liquid under pressure to a patient through a length of tubing, the tubing including a pressurizing system, a first occlusion system and a regulation system located upstream from the first occlusion system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, the tubing also including a segment downstream of the first occlusion system having a downstream pressure;
creating a positive pressure in the intermediate segment and the downstream segment with the pressurizing system during injecting of a liquid to a patient; and
preventing backflow away from the patient and into the intermediate segment when injection to a patient is desired to be stopped, by maintaining a greater pressure in the intermediate segment than in the downstream segment, at least until the patient is disconnected from the tubing.
0 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a device for injecting liquid, comprising a piece of tubing on which there is situated at least a first liquid occlusion system. According to the invention, a regulation system is situated upstream from the first occlusion system, the two systems defining an intermediate segment in which the pressure, in the absence of injection, is greater than the pressure that exists downstream from the first occlusion system so as to direct any leak of liquid from the first occlusion system downstream. The invention is applicable to a pump used for injecting contrast liquid for medical imaging.
7 Citations
11 Claims
-
1. A method for injecting liquid under pressure to a patient, the method comprising:
-
providing liquid under pressure to a patient through a length of tubing, the tubing including a pressurizing system, a first occlusion system and a regulation system located upstream from the first occlusion system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, the tubing also including a segment downstream of the first occlusion system having a downstream pressure; creating a positive pressure in the intermediate segment and the downstream segment with the pressurizing system during injecting of a liquid to a patient; and preventing backflow away from the patient and into the intermediate segment when injection to a patient is desired to be stopped, by maintaining a greater pressure in the intermediate segment than in the downstream segment, at least until the patient is disconnected from the tubing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification