Method of fabricating a heater coil for a catheter used to monit

Details Method of fabricating a heater coil for a catheter used to monit Method of fabricating a heater coil for a catheter used to monit

1995-03-15

1997-10-14

Echols, P. W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

29611, 29447, 128713, 156172, 1562742, B65H 8100, B32B 3100, H05B 300, B23P 1102

Patent

active

056767846

ABSTRACT:
A heater (12) for a catheter (10) used in monitoring constant cardiac output is fabricated using a bifilar wire (21) coated with polyvinyl chloride (PVC) like the material used for the catheter. The bifilar wire is coated with the PVC using a conventional extrusion technique, producing a coated lead (24, 32). This coated lead is wrapped around the exterior surface of the catheter, forming a helical coil. Heat is applied to the coated lead to melt the PVC coating, causing it to bond the lead to the catheter. The melted PVC also flows into gaps (23) or notches between adjacent coils of the lead, producing a relatively smooth outer surface for the heater coil when the PVC coating cools. The bifilar wire can alternatively be wrapped in-line with PVC tape (29) or film and the PVC material heated to flow around the wire, bonding it to the catheter's outer surface.

REFERENCES:
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patent: 3359974 (1967-12-01), Khalil
patent: 3412354 (1968-11-01), Sattler
patent: 3568660 (1971-03-01), Crites et al.
patent: 4559951 (1985-12-01), Dahl et al.
patent: 4619643 (1986-10-01), Bai
patent: 5056526 (1991-10-01), Khalil
patent: 5265623 (1993-11-01), Kroll et al.
patent: 5335410 (1994-08-01), Burnham
patent: 5476562 (1995-12-01), Inhofe, Jr.
Search Report PCT/US 96/01996.

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