Compact pulsing pump for irrigation handpiece
US5046486A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1989 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Jan 13, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M3/0283
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical pulsed irrigation handpiece comprises a pistol-like housing having a handle and a barrel extending forwardly from the top of the handle. A finger actuable trigger is provided on the handle front edge. An axially elongate pulsing pump extends longitudinally in the handle. An outlet tube extending from the top of the pump bends forwardly toward the front end of the barrel. The trigger controls pulsed liquid outflow from the pulsing pump through outlet tube. A preferred pulsing pump provides a piston axially slidable in a casing and a poppit axially slidable with respect to the piston. A first spring urges the piston rearward in the casing. A second spring urges the poppit forwardly with respect to the piston. A pumped liquid chamber in the casing ahead of the piston responds to piston reciprocation to provide a pulsed liquid outflow. The poppit responds to both piston travel and gas pressure in a motor chamber to pop open a gas exhaust port to terminate an irrigant liquid pulse and return the piston to a starting position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.