Aiming device for setting nails in bones

• US 4,418,422 A
• Filed: 03/11/1981
• Issued: 11/29/1983
• Est. Priority Date: 02/22/1978
• Status: Expired due to Term

• Current Assignee: Howmedica International Incorporated
• Original Assignee: Howmedica International Incorporated
• Inventors: Behrens, Klaus, Harder, Hans E., Richter, Karl M.
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Grigsby, T. N.
• Application Number:
  US06/242,679
• Time in Patent Office: 993 Days
• Field of Search: 378/163, 378/205, 378/162, 128/92 BA, 128/92 BB, 128/92 EB
• US Class Current: 378/205
• CPC Class Codes: A61B 17/1703 using imaging means, e.g. by X-rays
• CPC Class Codes: A61B 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• CPC Class Codes: A61F 5/04 Devices for stretching or reducing fractured limbs; Devices for distractions; Splints plaster of Paris bandages A61F13/04; with surgery A61B17/60

Abstract

A device for positioning a holder for an aiming sleeve for implanted bone nail fasteners with respect to a Roentgen ray source includes a support (25) for supporting the holder (7). A base plate (12) and a pivotable bracket plate (3) receives the support means and is mountable on the housing of the Roentgen ray source for spacedly positioning the holder from the source. The support is formed as a fork-like element (26, 28, 29) retained in sleeves (38, 39) on the bracket plate by means of locking cams (8).

Claims

1. An aiming device for fasteners of an implanted bone nail, said device being suitable for use with a Roentgen ray source having an exit window emitting a radiation beam, said device comprising:

a reception socket (7) for receiving a fastener aiming sleeve (32);

support means (25) for said reception socket; and

mounting means (3,12) for joining said support means with the housing (21) of the Roentgen ray source (4),

said support means comprising means for positioning said reception socket spaced from the exit window (22) of the Roentgen ray source and approximately in the center of the radiation beam of the source.

2. The device according to claim 1 wherein said reception socket has a hole in the bottom thereof, said socket being adjustable with respect to said support means (25).

3. The device according to claim 2 wherein said support means includes a fork-like element (26, 28, 29) having a pair of prongs joined to a common portion, wherein said reception socket is mounted on said common portion, and wherein said mounting means (12, 3) has a pair of sleeves (38, 39) for receiving the prongs of the fork.

4. The device according to claim 3, characterized in that at least one locking element (8) is mounted on the mounting means for securing the fork-like element (26, 28, 29) in selected positions.

5. The device according to claim 4, characterized in that the mounting means comprises a base plate (12) connectable to the Roentgen ray source housing and a bracket plate (3) which is pivotally mounted on the base plate (12) and contains the sleeves (38 and 39).

6. The device according to claim 5, characterized in that, on the base plate, a manually operable locking mechanism (14) is mounted and the pivotable bracket plate (3) includes a locking portion (64) which can be brought into interlocking engagement with the locking mechanism (14).

7. The device according to claim 5, characterized in that the locking element is an eccentric locking cam (8) connected with a rotary shaft (43) journalled in said mounting means and placed in an opening area of each of said sleeves (38 and 39) and the rotary shaft (43) is connected to a bell crank linkage arranged on the bracket plate (3).

8. The device according to claim 7, characterized in that a pivotable arm (45) is connected to the rotary shaft (43) and to an actuating portion (46 and 47) which, in turn, is pivotally connected to a second pivotable arm (48), said second arm being rigidly connected to a second rotary shaft (50) journalled in said bracket plate (3) and on which shaft is fixed eccentric retaining plates (52, 53), said second shaft having a handle (9) for rotating same.

9. The device according to claim 8, characterized in that the eccentric plates (52, 53) are arranged in such a way that in the locking position they are in self-locking engagement with resilient shoes (62 and 63) on the pivotable bracket plate (3).

10. The device according to claim 9, characterized in that at least portions of bracket plate (3) and base plate (12) lie parallel when in the locking position and that adjusting screws (65, 66) for said resilient shoes are mounted such that they extend through bracket plate (3) when in the locking position and are forced onto the base plate (12), thereby to compensate for any clearance existing between the bracket plate (3) and base plate (12).