Medical device for injecting liquid
First Claim
Patent Images
1. A device for injecting liquid under pressure to a patient, the device comprising:
- means for pumping the liquid, a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing;
a first occlusion system located on the length of tubing downstream of the regulation system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure, wherein the intermediate pressure, in the absence of injection to the patient, is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient;
a first pressure sensor connected to the intermediate segment which measures any drop in the intermediate pressure in the absence of injection to the patient to detect leakage from the intermediate segment, the first pressure sensor having an output indicative of leakage from the intermediate segment, said output being operative in the absence of injection to the patient;
means responsive to the output of the first pressure sensor for assisting in prevention of contamination of components upstream of the first occlusion system; and
a disconnection system situated on the intermediate segment, said disconnection system comprising a boundary between a piece of tubing downstream therefrom for single use and a piece of tubing upstream therefrom for multiple use, wherein said disconnection system further comprises means for occluding at least one piece of the tubing that is activated prior to disconnection.
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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 (4) 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.
65 Citations
74 Claims
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1. A device for injecting liquid under pressure to a patient, the device comprising:
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means for pumping the liquid, a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing;
a first occlusion system located on the length of tubing downstream of the regulation system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure, wherein the intermediate pressure, in the absence of injection to the patient, is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient;
a first pressure sensor connected to the intermediate segment which measures any drop in the intermediate pressure in the absence of injection to the patient to detect leakage from the intermediate segment, the first pressure sensor having an output indicative of leakage from the intermediate segment, said output being operative in the absence of injection to the patient;
means responsive to the output of the first pressure sensor for assisting in prevention of contamination of components upstream of the first occlusion system; and
a disconnection system situated on the intermediate segment, said disconnection system comprising a boundary between a piece of tubing downstream therefrom for single use and a piece of tubing upstream therefrom for multiple use, wherein said disconnection system further comprises means for occluding at least one piece of the tubing that is activated prior to disconnection. - View Dependent Claims (2, 3, 4)
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5. A device for injecting liquid under pressure to a patient, the device comprising:
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means for pumping the liquid;
a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing;
a first occlusion system located on the length of tubing downstream of the regulation system the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure wherein the intermediate pressure, in the absence of injection to the patient is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient;
a first pressure sensor connected to the intermediate segment which measures any drop in the intermediate pressure in the absence of injection to the patient to detect leakage from the intermediate segment, the first pressure sensor having an output indicative of leakage from the intermediate segment, said output being operative in the absence of injection to the patient; and
means responsive to the output of the first pressure sensor for assisting in prevention of contamination of components upstream of the first occlusion system, wherein the means for assisting includes the means for pumping which is activated in response to the output of the first pressure sensor indicative of leakage from the intermediate segment so as to maintain the intermediate pressure in said intermediate segment at least at a predetermined threshold.
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6. A device for injecting liquid under pressure to a patient, the device comprising:
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means for pumping the liquid;
a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing;
a first occlusion system located on the length of tubing downstream of the regulation system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure, wherein the intermediate pressure, in the absence of injection to the patient, is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient;
a first pressure sensor connected to the intermediate segment which measures any drop in the intermediate pressure in the absence of injection to the patient to detect leakage from the intermediate segment, the first pressure sensor having an output indicative of leakage from the intermediate segment, said output being operative in the absence of injection to the patient; and
means responsive to the output of the first pressure sensor for assisting in prevention of contamination of components upstream of the first occlusion system, wherein the means for assisting includes means for modifying the intermediate pressure of said intermediate segment in the absence of injection to the patient so as to obtain an intermediate pressure which lies between the downstream pressure and the opening pressure of the first occlusion system. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A device for injecting liquid under pressure to a patient, the device comprising:
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means for pumping the liquid;
a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing;
a first occlusion system located on the length of tubing downstream of the regulation system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure, wherein the intermediate pressure, in the absence of injection to the patient, is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient;
a first pressure sensor connected to the intermediate segment which measures any drop in the intermediate pressure in the absence of injection to the patient to detect leakage from the intermediate segment, the first pressure sensor having an output indicative of leakage from the intermediate segment, said output being operative in the absence of injection to the patient;
means responsive to the output of the first pressure sensor for assisting in prevention of contamination of components upstream of the first occlusion system; and
a disconnection system situated on the intermediate segment, said disconnection system comprising a boundary between a piece of tubing downstream therefrom for single use and a piece of tubing upstream therefrom for multiple use, wherein said upstream piece and said downstream piece are capable of co-operating in releasable manner so as to form a leakproof link, said upstream piece having an intermediate chamber having an internal volume that is adjustable by a moving piston. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A device for injecting liquid under pressure to a patient, the device comprising:
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means for pumping the liquid;
a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing;
a first occlusion system located on the length of tubing downstream of the regulation system, the first occlusion system and the regulation system defining an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure, wherein the intermediate pressure, in the absence of injection to the patient, is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient;
a first pressure sensor connected to the intermediate segment which measures any drop in the intermediate pressure in the absence of injection to the patient to detect leakage from the intermediate segment, the first pressure sensor having an output indicative of leakage from the intermediate segment, said output being operative in the absence of injection to the patient;
means responsive to the output of the first pressure sensor for assisting in prevention of contamination of components upstream of the first occlusion system;
a second pressure sensor situated on a patient tubing segment located downstream from the first occlusion system; and
a measurement system responsive to the output of the first pressure sensor and an output of the second pressure sensor, the measurement system structured to measure a difference in pressure between the pressure in the intermediate segment and the pressure in the patient tubing segment downstream from the first occlusion system in the absence of injection to the patient, wherein the means for assisting includes the means for pumping, wherein in the absence of injection to the patient, the means for pumping is activated in response to measurement of the pressure in the intermediate segment being approximately equal to or less than the pressure in the patient tubing segment downstream from the first occlusion system, so as to maintain the intermediate pressure in the intermediate segment above the pressure in the patient tubing.
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23. A device for injecting liquid under pressure to a patient, the device comprising:
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means for pumping the liquid;
a length of tubing extending from the pumping means to the patient;
a regulation system located on the length of tubing and having a second opening pressure;
a first occlusion system located on the length of tubing downstream of the regulation system and having a first opening pressure, the first opening pressure being lower than the second opening pressure; and
wherein the first occlusion system and the regulation system define an intermediate segment having an intermediate pressure, a segment of tubing downstream of the first occlusion system having a downstream pressure, wherein the intermediate pressure, in the absence of injection to the patient, is greater than the downstream pressure to direct leakage of liquid from the first occlusion system downstream toward the patient. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74)
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Specification