External pump stroke indicator for use with an implanted medication infusion system
US5499974A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1994 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Oct 20, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/14276
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.