Multi-position ratchet mechanism

Details Multi-position ratchet mechanism Multi-position ratchet mechanism

1981-10-09

1984-01-10

Howell, Kyle L.

Machine element or mechanism

Control lever and linkage systems

Elements

128 20, G05G 506

Patent

active

044247249

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 pivotably 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 pivot pawl rotatably mounted and spring biased into the ratchet slot. The holder includes a transverse slot which slides onto an oval ring which is mounted about the incision site.

REFERENCES:
patent: 677181 (1901-06-01), Dardano
patent: 1433153 (1922-10-01), Robinson
patent: 3196875 (1965-07-01), Pfeiffer
patent: 3550584 (1970-12-01), Ring
patent: 3965890 (1976-06-01), Gauthier
patent: 4254763 (1981-03-01), McCready et al.
patent: 4267748 (1981-05-01), Grunewald et al.
patent: 4337761 (1982-07-01), Upsher

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