Surgery – Instruments – Cutting – puncturing or piercing
Patent
1997-06-25
1998-11-10
Dawson, Glenn K.
Surgery
Instruments
Cutting, puncturing or piercing
408226, 606 80, A61B 1732
Patent
active
058337040
ABSTRACT:
A replaceable rotary patient tissue working tool and a high speed rotational surgical handpiece having a centrifugal chuck for axial push-in chucking and pull-out release of such a tool includes a chuck including a centrifugal locking member with a mass portion located on one side of a rotational axis of a drive shaft. The centrifugal locking member is pivoted on an axis transverse to the drive shaft axis and has a leg extending past said rotational axis. The leg has tool gripping structure on the opposite side of such rotational axis for receiving a tool rear shank rearward axially therepast and for more strongly radially gripping such a tool shank in response to faster rotation of the drive shaft. The invention, in another aspect, includes a tool having an elongate shank, patient tissue working structure at a front end of the shank and mounting structure at the rear end of the shank. The mounting structure includes a radially depressed plateau engageable by such centrifugal locking member.
REFERENCES:
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patent: 5634933 (1997-06-01), McCombs et al.
patent: 5735535 (1998-04-01), McCombs et al.
Photocopy of a cross sectional view of a prior high speed rotational surgical handpiece including a chuck of the kind used with below discussed p. 14, Figure 20 tool shank A.
Photocopy of brochure No. 1000-33 REV Jul. 1994 entitled Command 2 Oral and Maxillofacial, pp. 1-4.
"Command2 MicroElectric System" Maintenance Manual & Operating Instructions: Photocopy of p. 14, Figures 19 and 20 show prior art (on sale more than 1 year prior to filing date of present application) shanks A, B and C.
Sketch A (shank A pictorial view).
McCombs Daniel L.
Walen James G.
Dawson Glenn K.
Stryker Corporation
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