Shunt tap apparatus and method

Surgery – Diagnostic testing – Measuring fluid pressure in body

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604 9, A61B 500

Patent

active

057953074

ABSTRACT:
A shunt tap device is provided for use in sensing CSF pressure data in a shunt implanted in a subject, wherein the shunt comprises a valve having a reservoir, and first and second catheters providing CSF flow paths toward and away from the valve, respectively. The shunt tap device is provided with a hollow needle for temporarily forming an aperture through the wall of the reservoir, to communicate with CSF contained therein. A length of flexible microbore tubing extends from the needle to a coupling, such as a Touhy-Borst connector, which is disposed to receive the pressure transducer component of a pressure monitoring device into a narrow fluid enclosure, collectively formed by the hollow needle, tubing, and a portion of the connector. The fluid enclosure is filled with a saline fluid or the like, having properties similar to CSF. The connector is tightened to seal the saline fluid within the fluid enclosure, and also to retain the pressure transducer in the enclosure, in contact with the saline fluid. By means of such arrangement, CSF pressure data is transmitted from the reservoir to the pressure transducer through the saline fluid, enabling a pressure reading to be provided by the monitor. At the same time, the arrangement allows only negligible amounts of CSF to flow out of the reservoir.

REFERENCES:
patent: 3958558 (1976-05-01), Dunphy et al.
patent: 4127110 (1978-11-01), Bullara
patent: 4231376 (1980-11-01), Lyon et al.
patent: 4385636 (1983-05-01), Cosman
patent: 4660568 (1987-04-01), Cosman
patent: 4676255 (1987-06-01), Cosman

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