Geometrical instruments – Area integrators – Electrical
Patent
1987-03-12
1988-10-25
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
33169R, 33512, 33147K, G01B 514
Patent
active
047793490
ABSTRACT:
An instrument for measuring the distance between bone parts in a knee joint, particularly the distance between both femoral condyles (A', A") at the knee end of the femur (A), the instrument including a first element (3, 4, 12) with a first abutment surface (5), which is intended to be brought into engagement against one bone part (A'), and a second element (7, 9), which is displaceably mounted in the first element and at one end is provided with a second abutment surface (2) intended for being brought into engagement against the second bone part (A", C) there also being a scale (10) with an index for indicating the displacement of the second element in relation to the first element. The first element includes a tube (3, 4) bent at substantially a right angle, with the first abutment surface (5) situated on the outside of the bend. The second element (7, 9) is flexible (at 7), and inserted in the tube for displacement therein, so that the second abutment surface (2) projects out from the tube, the second element being provided at a distance from its first end with either the scale (10) or index, which can be read against the index or the scale of the first element.
REFERENCES:
patent: 745357 (1903-12-01), Lanham
patent: 1501170 (1924-07-01), Korb
patent: 2241451 (1941-05-01), Fist
patent: 3274692 (1966-09-01), Morrison
patent: 3559292 (1971-02-01), Weissman
Gillquist Jan I.
Odensten Magnus G.
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