Injection system

Details Injection system Injection system

1983-01-13

1985-03-05

Cohen, Lee S.

Surgery

Truss

Pad

128713, 604246, A61B 502

Patent

active

045024880

ABSTRACT:
An interactive injection system for use with a catheter of the type adapted for insertion into a patient's vascular system for thermodilution measurements and the like includes a chamber for storing liquid injectate, means for connecting the chamber to the catheter lumen, and a drive for operating on the chamber to flow liquid injectate from the chamber into the lumen for discharge as a bolus from the lumen into the vascular system of a patient. In preferred embodiments, a temperature sensing probe is connected between the injection chamber and the catheter for monitoring the temperature of injectate as it is introduced into the catheter. Cooperating controller apparatus includes means for operating the drive, operator controlled inputs for selecting injectate rate and volume parameters, another operator controlled input for enabling the injector drive, an input from a sensor adapted to be located in the patient's vascular system downstream from the proximal port and operative during an injection cycle in response to a sensed deviation of output (e.g., out of specification for terminating the injection sequence, and a processor for utilizing (e.g., integrating) the sensor output to generate a cardiac output value or similar data.

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Wilson, "Application of Thermal-Electronic Instrum. to Biol. Flows", Proc. of 8th Ann. 1969 IEEE Region III Convention, 11-1969, pp. 45-50.
Weisel, R. D., et al., "Clinical Applications of Thermodilution Cardiac Output Determinations", Am. J. of Surgery, 129; Apr. 1975, pp. 449-454.
Wong, M. et al., "Loss of Indicator in the Thermodilution Technique", Catheterization and Cardiovascular Diagnosis, 4:103-109, (1978).
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