Distance measuring instrument for pedicle screws

Details Distance measuring instrument for pedicle screws Distance measuring instrument for pedicle screws

2007-10-02

2007-10-02

Robert, Eduardo C. (Department: 3733)

Geometrical instruments

Distance measuring

Opposed contacts

C033S807000, C033S512000, C606S102000

Reexamination Certificate

active

10830504

ABSTRACT:
The invention relates to a distance measuring instrument for pedicle screws which detects the spacing between two pedicle screws (3, 3′) with the ends (26, 27) of two crossing limbs (11, 12) and displays it on a cross-bar (25) fixedly connected to one of the limbs at a scale (22). Since the second limb (12) is divided into a pointer (16a) and into a flexural spring extending parallel to it at which a pronounced thumb grip (21a) is fastened, and since the thumb grip is connected to a scale (24) via which a pre-determined pre-tension can be read off relative to the pointer (16a), a spacing measurement can take place under a controlled pre-tension.

REFERENCES:
patent: 1990138 (1935-02-01), Schuster
patent: 3815247 (1974-06-01), Debrunner
patent: 4972602 (1990-11-01), Howes
patent: 5070623 (1991-12-01), Barnes
patent: 5188121 (1993-02-01), Hanson
patent: 5329933 (1994-07-01), Graf
patent: 5428903 (1995-07-01), Pocci
patent: 5454175 (1995-10-01), Li
European Search Report dated Sep. 23, 2003 re EPO Appl. 03 009 327.2.
Translation of European Search Report dated Sep. 23, 2003 re EPO Appl. 03 009 327.2.

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