SU1718885A1 - Screwdriver and screw for osteosynthesis - Google Patents

Abstract

The invention relates to medicine, in particular, to devices for fixing bones in the treatment of fractures. The goal is to eliminate the screw skew during installation and insertion and securely grip the screw head. The screw contains a threaded rod 1 with a head 2 with cross-shaped slits 3, the base of the head 4 is made with a cylindrical section 5 and an end stop 6, and the slots 3 are made concave. A screwdriver-screw holder contains a handle at one end and a cross-shaped blade at the other end, a sleeve with a face grip and a side cut-out for the screw head 2 mounted on the rod for longitudinal movement, the end blade is arcuately convex under the slot 3 of head 2 with the rod is a threaded joint, and the diameter of the central opening of the grip is equal to the diameter of the cylindrical screw 5 of a screw. The screw is fixed in the hole, rotating the sleeve, while the head 2 is pressed against the blade, the screw is centered due to the bow 5 and the arc-shaped slot 3 and the blade. 2 sec. f-ly, 3 ill. (Ls

Description

Fig /

The invention relates to medicine, in particular to devices for fixing bone fragments in the treatment of bone fractures,

The aim of the invention is to eliminate the skew of the screw during installation and insertion and securely grip the screw head.

Figure 1 shows a screw for osteosynthesis; figure 2 - screwdriver-screwdriver; on fig.Z - screw installed in a screwdriver.

The screw contains a threaded rod 1 with a head 2, with cross-shaped slits 3, the base of the head 4 is made with a cylindrical part 5 and an end stop 6, and the slots 3 are made concave.

A screwdriver-screw holder contains a handle 7 at one end 8 and a cross-shaped blade 9 at the other end 10, a sleeve 11 with an end grip 12 and a side cut

13, a screw head 2 mounted on the rod 14c with the possibility of longitudinal movement, the blade 9 from the end 15 is made arcuately convex under the slots 3 of the head 2, the sleeve 11 is connected to the rod

14 with a threaded connection, and the diameter of the central hole 16 of the grip 12 is equal to the diameter of the cylindrical screw 5 of the screw.

The screw is used as follows.

The head of the screw 2 is inserted into the grip 12. Rotating the sleeve 11 brings the head 2. of the screw to the ends 15 of the cross-shaped blade 9. Turning the screw aligns the slots 3

the head 2 with the ends 15 of the blade 9; in this case, the screw and the screwdriver rod 14 are fixed in the angular direction. Rotating the sleeve 11, create the necessary force to press the head 2 to the blade 9 in the axial direction. To separate the screw and screwdriver-screw holder, the operations are repeated in reverse order.

The device allows for quick and accurate installation of the screw, while maintaining its rigid fixation in the screwdriver at the time of the final tightening.

Claims (2)

1. Screw for osteosynthesis, containing a threaded rod with a head with a cross-shaped slits, characterized in that, in order to avoid a skew of the screw during installation and insertion, the base of the head is made with a cylindrical along the face and end stop, and the slots are concave. 2. A screwdriver for a screw containing a handle at one end and a cross-shaped blade at the other end, with an end sleeve a grip and a side cut-out for the screw head mounted on the rod with the possibility of longitudinal movement, characterized in that, in order to securely grip the screw head, the blade from the end is made arcuate-convex under the slot of the screw head, the sleeve is connected to the stem by a threaded connection, and the diameter the central opening of the grip is equal to the diameter of the cylindrical screw. g 2 (yig.z Compiled by T. Maslikova Editor V. Bugrenkova Tehred M. Morgen Corrector A. Osaulenko Order 714. Circulation: Subscription 13NIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk Nab.