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1. (US5913867) Surgical instrument

专利局 : 美国
申请号: 08772340 申请日: 23.12.1996
公布号: 5913867 公布日: 22.06.1999
授权号: 5913867 授权日: 22.06.1999
公布类型: A
国际专利分类:
A61B 17/14
A61B 17/16
A61B 17/32
A61M 1/00
A 人类生活必需
61
医学或兽医学;卫生学
B
诊断;外科;鉴定
17
外科器械、装置或方法,例如止血带
14
外科锯
A 人类生活必需
61
医学或兽医学;卫生学
B
诊断;外科;鉴定
17
外科器械、装置或方法,例如止血带
16
碎骨器;骨钻或骨凿;环钻
A 人类生活必需
61
医学或兽医学;卫生学
B
诊断;外科;鉴定
17
外科器械、装置或方法,例如止血带
32
手术切割器械
A 人类生活必需
61
医学或兽医学;卫生学
M
将介质输入人体内或输到人体上的器械;为转移人体介质或为从人体内取出介质的器械;用于产生或结束睡眠或昏迷的器械
1
医用吸引或汲送器械;抽取、处理或转移体液的器械;引流系统
申请人: Smith & Nephew, Inc.
发明人: Dion Ernest A.
代理人: Fish & Richardson P.C.
优先权数据:
标题: (EN) Surgical instrument
摘要: front page image
(EN)

A surgical instrument comprises an inner tube which rotates within an outer tube and carries a surgical tool that includes a burr for cutting tissue exposed to the burr through an opening in the outer tube. The instrument includes several features which enhance the efficiency at which tissue fragments severed by the burr are aspirated through the inner tube, and which enable the burr to effectively cut relatively soft tissue as well as harder tissue such as bone. For example, the burr includes a proximal shank having a wall that has an aperture therein with a substantial width relative to an outer diameter of the wall for conveying tissue fragments cut by the burr into an interior chamber of the shank, and thence into a passage in the inner tube. The opening in the outer tube is axially elongated sufficiently to expose a major portion of the aperture. The large aperture and its exposure by the outer tube opening reduce the risk of clogging by admitting larger tissue fragments into the inner tube for aspiration. Additionally, the burr includes a plurality of grooves that are axially elongated and inclined transversely to the flutes, and the grooves define a plurality of axially spaced notches in each of the cutting edges. The notches divide the cutting edges into relatively small segments that produce correspondingly small tissue fragments (even when the burr is used to cut soft tissue) to further reduce the risk of clogging. In addition, the cutting edges are preferably provided with a positive rake that makes the cutting edges sharper and suitable for effectively cutting, rather than tearing or shredding, relatively soft tissue.