External pump stroke indicator for use with an implanted medicat

Details External pump stroke indicator for use with an implanted medicat External pump stroke indicator for use with an implanted medicat

1994-10-20

1996-03-19

Hirsch, Paul J.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604254, A61M 548

Patent

active

054999740

ABSTRACT:
The invention is directed to an external pump stroke indicator for use with in an implanted medication infusion system of the type having a pump for conveying medication into the patient, an opening covered by a septum is arranged at the output of the pump. The indicator includes a cylinder composed of a transparent material and connectable via its lower end to the opening in an essentially upright attitude, the cylinder being filled with a liquid. A movable sinker member is provided in the cylinder, the movable sinker member normally resting as a result of its weight against a seat provided in the cylinder that limits the motion of the sinker member in the direction of the lower end of the cylinder. The sinker member is composed of a material that has a higher density than that of the liquid, so that the sinker member normally rests against the seat and only moves when pressure elevations that are generated by the pump strokes of the infusion system arise in the liquid.

REFERENCES:
patent: 3101710 (1963-08-01), Koehn
patent: 3465784 (1969-09-01), Cofoid
patent: 3669094 (1972-06-01), Heyer
patent: 3980082 (1976-09-01), Miller
patent: 4055176 (1977-10-01), Lundquist
patent: 4626243 (1986-12-01), Singh et al.
patent: 4801293 (1989-01-01), Jackson
patent: 5197322 (1993-03-01), Indravudh
patent: 5346477 (1994-09-01), Edwards

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