Blood pulsating and/or pumping device
US4250872A · kind A · utility
Inventor
Key dates
| Filing date | May 25, 1978 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | May 25, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M60/892
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A continuous length of flexible polymeric tubing having a smooth fissureless inner surface throughout is provided with a region intermediate its ends which region has an inside diameter greater than the inside diameter of the remainder of said tubing and a thinner wall than that of the remainder of said tubing with a gradual transition in wall thickness and diameter therebetween. A rigid walled enclosure surrounds said region of the tubing with a slight clearance therebetween except at the ends of the enclosure which encircle the tubing beyond said region with a snug fit. A duct is joined to the enclosure near one end for feeding fluid under pressure thereto. Various arrangements of over-pressure relief prevent pinching of the tubing while affording controlled indentation thereof. The transition section of the tubing wall can cooperate with a port in the enclosure to afford said overpressure relief. Portions of the tubing wall may be thickened (i.e., strengthened) or attached to the enclosure to limit indentation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.