Surgical stapling instrument having preloaded firing assistance mechanism
US7357287B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2005 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Dec 20, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/320052
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical severing and stapling instrument clamps tissue in a staple applying assembly comprising a lower jaw of an elongate channel holding a staple cartridge and a pivotally opposed upper jaw (anvil). A firing handle drives a rack in a handle connected to a firing rod and bar that pass through an elongate shaft and into the staple applying assembly to sever and staple tissue. Upon release of the firing handle, a retraction spring assists in withdrawing the rack and other firing components. To advantageously assist in firing, a spring biased plunger is cocked prior to firing to impart assistance upon depression of the firing trigger. Alternatively, a torsion coil spring ratchet mechanism is preload to act through a gear into the rack to assist. As a further alternative, a retraction spring is preload and disengaged until the rack is fully fired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.