Volumetric infusion pump with servo valve control
US6398760B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/16881
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An infusion pump (10) includes a reservoir (18) containing a therapeutic liquid to be infused. The reservoir (18) includes an outlet (36) for the liquid. A volumetric air pump (24) is operatively associated with the reservoir (18) to pressurize the reservoir and thus drive liquid out the outlet (36). A valve (12) is operatively associated with the outlet (36) and prevents the flow of liquid through the outlet until a select threshold pressure is obtained in the outlet. The valve thereafter maintains an opening in the outlet that keeps the pressure in the reservoir (18) at substantially the select threshold pressure, whereby the volumetric flow rate of liquid through the outlet (36) is proportional to the volumetric flow rate of air from the volumetric air pump (24). The valve (12) varies the opening in the outlet to maintain the select pressure. The outlet preferably consists of a flexible conduit (36) having a select undeformed inner cross-sectional area and the valve (12) variably restricts the flow of liquid through the outlet by pinching a segment of the conduit to vary the inner cross-sectional area of the segment of the conduit. A method of infusing therapeutic liquid to a pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.