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Patent

  1. Avancerad patentsökning
PublikationsnummerUS3554192 A
Typ av kungörelseBeviljande
Publiceringsdatum12 jan 1971
Registreringsdatum23 jul 1968
Prioritetsdatum24 jul 1967
PublikationsnummerUS 3554192 A, US 3554192A, US-A-3554192, US3554192 A, US3554192A
UppfinnareIsberner Dietmar R
Ursprunglig innehavareOrthopedic Equipment Co
Exportera citatBiBTeX, EndNote, RefMan
Externa länkar: USPTO, Överlåtelse av äganderätt till patent som har registrerats av USPTO, Espacenet
Medullary space drill
US 3554192 A
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United States Patent Dietmar R. lsberner Inventor Gross-Nordsee, Germany Appl. No. 747.000 Filed July 23, 1968 Patented Jan. 12, 1971 Assignee Orthopedic Equipment Company, inc.

Bourbon, Ind. a corporation of Indiana Priority July 24, 1967 Germany No. 1,566,134

MEDULLARY SPACE DRILL 5 Claims, 2 Drawing Figs.

US. Cl 128/83, 128/303. l28/3l0: 77/ 5,77/21 Int. Cl A611 5/04 [50] Field of Search l28/83, 303, 303.14, 92E, 305, 310; 77/15, 58, 65, 20, 21,

[56] References Cited UNITED STATES PATENTS 2,747,384 5/1956 Beam 77/15X 2,905,178 9/1959 Hilzinger Ill 75/15X Primary Examiner-Adele M. Eager Assistant Examiner-J. Yasko Attorney-Cushman, Darby & Cushman' ABSTRACT: The invention relates to a medullary space drill including a flexible shaft carrying at its opposite ends respectively a drill head, and an adapter piece adapted to be connected for rotation with a driving means. The shaft comprises a plurality of parallel flexible elements arranged to provide a central passage for receiving an elongated guide element.

PATEmenJmzmu 'IIIIF .l ill FIG. 1

mvsmoa Jaw/4e K136594496 l I. v Manu LAnY sPA'cE DRILL {DISCLOSURE .f

Medullary space drills this type are used for boring or widening the medullary space. of bones. in preparation of the insertion of a medullary peg. The medullary canal in the bone in general does not extend along a straight line, and insertion I of the medullary space drill frequently can be effected only at a certain angle relative to the actual direction of the drilling operation. For this reason medullary space drills used for widening the medullary canal of bonesare provided with a flexible shaft which enables-the drill head,- when penetrating into the medullary canal of the bone,"to follow the extension of the medullary canal, and which furthermore allows displacement of the driving means fotthe drill under a certain between the-separate windings of the beliefs, between the helics, and within theshaft, and cannot be removed completely. As the medullary space drills are rendered sterile or autoclaved before every drilling operation, these residues are rendered sterile too; however, examinations of infections have shown that such residues nevertheless may be the cause for infections after operation.

Another disadvantage of the prior medullary space drills consists in that atwisting angle is formed between the drill head and the adapter piece for rotational'connection with a drive shaft, which angle may be as great'a's 20, and exhibits unfavorable effects in the course of the actual working opera- ,tion. Due to the elasticity of their shafts such prior drills therefore tend to chatter, and this disturbs the operation. Thus, it is an object of the invention to provide an improved medullary space drill havinga sufficiently flexible shaft, which may easily and completely be cleaned, which has substantial torsional rigidity, and which provides for smooth and uniform drilling operation even under maximum load.

According to the invention, these objects are solved by forming the shaft from a plurality of 7 parallel, flexible individual elements.

Furthermore, advantageous embodiments of the subject matter of the invention consist in that the individual elements are disposed in an annularassembly', that such elements have circular cross section and that they may be welded or soldered adapter piece for rotational connecto the drill head and the tion to a drive shaft.

The invention is hereafter explained in greater detail in connection with an embodiment thereof. by means of the drawings, wherein:

FIG; 1 is a sideelevational view of a medullary space drill according to the invention, and

FIG. 2 is a cross-sectional view taken along lines 22 of FIG.

According to FIGS, 1 and 2, the flexible'shaft 1 comprises a plurality of elongated, parallel, annularly disposed individual elements 2 of circular crosssection. these elements being united at their ends to form a bundle, for example by welding or brazing. The number of elements 2 depends on the size of the drill. In a drill of l3millimeters diameter, an annular arrangement of eight elements has proved to be expedient. One end of this bundle carries adn'll head 3 being enlarged in the region of its cutting edges, whereas the other end supports an adapter piece 4 for rotational connection to a drive shaft. The adapter piece 4 may have a plurality of projections pressed out therefrom whichprojections are engaged, in known manner. by a union nut 6 adapted to provide the connection with a complementary adapter piece of a drivi'n means. The outer diameter of the flex ble shaft 1 preferab y. is slightly smaller than that of the adapter piece 4 and of that portion of the drill head 3 which does not have any cutting edges.

Furthermore, both the adapter piece 4'and the drill head 3 may be provided, in known manner, witha central bore or passage 7 having approximately the some inner diameter as the flexible shaft 1 formed by the bundle of annularly arranged elements 2, said bore or passage 7 being adapted to receive therein an elongated guide element (not shown).

I claim:

1. A medullary space drill including a flexible shaft carrying at its opposite ends respectively a drill head having an axial bore therethrough. and an adapter piece for connection to a drive shaft whereby said drill may be rotated, said adapter piece having an axial bore therethrough, at least a portion of said flexible shaft being formed of a plurality of parallel, flexible individual elements extending between said drill head and said adapter piece, said individual elements being arranged to provide a central passage which together with the bores in said drill head and adapter piece is adapted to receive an elongated guide element.

2. The medullary space drill according to claim 1, wherein 5.-The medullary space drill according to claim 1 wherein said individual elements are soldered to said drill head and said adapter piece respectively.

Citat från patent
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Klassificeringar
USA-klassificering606/80, 408/127, 408/201, 606/79
Internationell klassificeringA61B17/16
Kooperativ klassningA61B17/1617, A61B17/164
Europeisk klassificeringA61B17/16J