Machine element or mechanism – Elements – Pawls and ratchets
Patent
1993-11-12
1994-12-27
Luong, Vinh T.
Machine element or mechanism
Elements
Pawls and ratchets
74535, 74537, 74538, 74540, 74575, 74577R, 128 20, 2483164, 2482318, G05G 100, A61B 1702
Patent
active
053754816
ABSTRACT:
A multi-position ratchet mechanism for holding a surgical retractor blade which permits a retractor blade to be rotated into the wound and retracted at the same time to duplicate the natural "toe-in" method of retraction achieved with the hand. The ratchet mechanism includes a ratchet holder to which is pivotally attached a ratchet pivot housing. The retractor blade is mounted in an opening projecting through ratchet pivot housing and held in position by a retractor pawl attached to the ratchet pivot housing. The ratchet pivot housing also has a curved ratchet which depends into a cooperating slot in the ratchet holder and engages a ratchet release bar which is mounted on the ratchet holder and spring biased into the ratchet slot. One end of ratchet release bar is positioned under an actuating surface of the retractor pawl. The application of pressure on the actuating surface will release both ratchets to allow adjustment of the retractor blade.
REFERENCES:
patent: 3749088 (1973-07-01), Gauthier
patent: 3965890 (1976-06-01), Gauthier
patent: 4254763 (1981-03-01), McCready et al.
patent: 4424724 (1984-01-01), Bookwalter et al.
patent: 4467791 (1984-08-01), Cabrera et al.
patent: 4834112 (1989-05-01), Machek et al.
patent: 4852552 (1989-08-01), Chaux
patent: 4865019 (1989-09-01), Phillips
patent: 5052373 (1991-10-01), Michelson
patent: 5052374 (1991-10-01), Jacinto
patent: 5067477 (1991-11-01), Santangelo
Amaral Francisco A.
Amaral John J.
Bookwalter John R.
Cabrera Rene J.
Codman & Shurtleff Inc.
Luong Vinh T.
Tatlow Michael Q.
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