CN201831949U - Compression hollow screw for femoral neck fracture and matching tool - Google Patents

Abstract

The utility model discloses a compression hollow screw for femoral neck fracture and a matching tool, the compression hollow screw comprises a screw rod, a self-tapping thread is arranged at the front section of the screw rod, an inner polygonal tool embedding groove is arranged at the tail part, and an outer polygonal nut structure is further arranged at the tail end of the screw rod; and the matching tool comprises a torsion bar, and an outer polygonal force application head matched with the inner polygonal tool embedding groove and an inner polygonal sleeve which is positioned outside the outer polygonal force application head and matched with the outer polygonal nut are arranged at the front end of the torsion bar. The compression hollow screw is provided with the inner polygonal tool embedding groove and simultaneously provided with the outer polygonal nut structure, when the hollow screw is taken out, force can be simultaneously applied on the inner polygonal tool embedding groove and the outer polygonal nut through the matching tool, the compression hollow screw can be easily taken out during the process of treating the femoral neck fracture, and the treatment process can be smoothly carried out.

Description

Fracture of femoral neck pressurization hollow screw group and kit

Technical field

This utility model relates to a kind of orthopedic medical device, particularly a kind of apparatus and kit that is used for the fracture of femoral neck operation.

Background technology

Claim fracture of femoral neck by femoral head down to the fracture between the base of nebk ot femur, generally adopt hollow nail to carry out internal fixation during treatment, insert 2～4 screws or steel nail respectively according to proximal femur bone structure and biomechanical principle, not only fixed, and can make broken ends of fractured bone pressurization, improve the healing rate of fracture, reduce the femur head necrosis rate.

In the prior art, hollow screw carries out dismounting by hexagon instrument embedded groove in aft mounted.The hexagonal embedded groove applied turning moment to hollow screw in the outer hexagon application of force head supporting with it embedded, and hollow screw is screwed out; Because belonging to little moment to the hollow screw application of force, outer hexagon application of force head drives, and repeatedly can produce axial thrust load to application of force head after the rotation, the phenomenon that hexagonal is skidded in the hollow nail appears when causing the application of force, the operator has to increase axial force, operation process is caused adverse effect, even cause hollow screw can't take out or take out difficulty.

Therefore, need a kind of fracture of femoral neck pressurization hollow screw group, in the therapeutic process of fracture of femoral neck, take out easily, therapeutic process is carried out smoothly.

The utility model content

In view of this, the purpose of this utility model provides a kind of fracture of femoral neck pressurization hollow screw group and kit, and in the internal fixation taking-up process after the fracture of femoral neck healing, the easier taking-up of pressurization hollow screw group is carried out therapeutic process smoothly.

Fracture of femoral neck pressurization hollow screw group of the present utility model comprises screw rod, and the screw rod leading portion is provided with the self-tapping type screw thread, and tail end is provided with inner polygon instrument embedded groove, and described screw rod tail end also is provided with outer polygonal nut structure.

Further, described inner polygon instrument embedded groove is relative with outer polygonal nut structure axial location and the limit number is identical, and inner polygon instrument embedded groove is corresponding parallel with each limit of polygon of outer polygonal nut structure;

Further, described inner polygon instrument embedded groove is a hexagonal structure in regular hexagon becomes, and outer polygonal nut structure is that regular hexagon becomes the hex nut structure;

Further, between described outer polygonal nut structure and the screw rod annular stop boss is set;

Further, the self-tapping type screw thread comprises the reverse tapping screw thread of preceding tapping screw thread and back that front and back set gradually;

The invention also discloses a kind of kit that is used for fracture of femoral neck pressurization hollow screw group, comprise torque arm, described torque arm front end is provided with the supporting outer polygon application of force head of inner polygon instrument embedded groove and is positioned at the outside and supporting inner polygon sleeve of outer polygonal nut of outer polygon application of force head.

Further, the loop bar structure that loop bar and trocar sheath were formed in described torque arm was served as reasons, described outer polygon application of force head is arranged at interior loop bar front end, and described inner polygon sleeve is arranged at trocar sheath;

Further, described interior loop bar tail end stretches out trocar sheath and fixedly installs handle, and the trocar sheath tail end is provided with horizontal shaft-like handle and forms T shape structure.

The beneficial effects of the utility model are: fracture of femoral neck pressurization hollow screw group of the present utility model and kit, the pressurization hollow screw group is when being provided with inner polygon instrument embedded groove, outer polygonal nut structure also is set, when taking out hollow screw, by supporting instrument, internal polygon tool embedded groove and outer polygonal nut be the application of force simultaneously, thereby in the therapeutic process of fracture of femoral neck, the pressurization hollow screw group is taken out easily, therapeutic process is carried out smoothly.

Description of drawings

Below in conjunction with drawings and Examples this utility model is further described.

Fig. 1 is the structural representation of this utility model pressurization hollow screw group;

Fig. 2 be Fig. 1 along A-A to cutaway view;

Fig. 3 is and the supporting tool construction sketch map of pressurization hollow screw group;

Fig. 4 be Fig. 3 along B-B to structural representation.

The specific embodiment

Fig. 1 is the structural representation of this utility model pressurization hollow screw group, Fig. 2 be Fig. 1 along A-A to cutaway view, as shown in the figure: the fracture of femoral neck pressurization hollow screw group of present embodiment, comprise screw rod 1, screw rod 1 leading portion is provided with self-tapping type screw thread 2, tail end is provided with inner polygon instrument embedded groove 4, and described screw rod 1 tail end also is provided with outerpolygonal nut structure 3.

In the present embodiment, described inner polygon instrument embedded groove 4 is relative with outerpolygonal nut structure 3 axial locations and the limit number is identical, inner polygon instrument embedded groove 4 is corresponding parallel with each limit of polygon of outerpolygonal nut structure 3, and neat appearance is easy to make and make its compact conformation.

In the present embodiment, described inner polygon instrument embedded groove 4 becomes interior hexagonal structure for regular hexagon, and outerpolygonal nut structure 3 becomes the hex nut structure for regular hexagon.

In the present embodiment, between described outerpolygonal nut structure 3 and the screw rod annular stop boss 5 is set, be used for the restriction and to tool positioned.

In the present embodiment, preceding tapping screw thread 2a that sets gradually before and after self-tapping type screw thread 2 comprises and back be tapping screw thread 2b oppositely; Because the back is the tapping screw thread structure oppositely, can make hollow screw be easier to take out.

Fig. 3 is and the supporting tool construction sketch map of pressurization hollow screw group, Fig. 4 be Fig. 3 along B-B to structural representation, as shown in the figure: the kit of present embodiment fracture of femoral neck pressurization hollow screw group, comprise torque arm, described torque arm front end is provided with the supporting outer polygon application of force of inner polygon instrument embedded groove 8 and is positioned at the outside and supportinginner polygon sleeve 9 of outer polygonal nut of outer polygon application of force head; Supporting with hollow screw of the present utility model, simple and easy to use.

In the present embodiment, the loop bar structure thatloop bar 6 and trocarsheath 7 formed in described torque arm was served as reasons, the described outer polygon application of force 8 is arranged atinterior loop bar 6 front ends, and describedinner polygon sleeve 9 is arranged at trocarsheath 7; Adopt the loop bar structure, can select as required to use, can adjust the size of the inside and outside application of force, and convenient the manufacturing.

In the present embodiment, describedinterior loop bar 6 tail ends stretch out trocar sheath and fixedly install handle 6a, and trocarsheath 7 tail ends are provided with horizontal shaft-like handle 7a and form T shape structure, can prevent operational interference.

Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although this utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (8)

1. a fracture of femoral neck pressurization hollow screw group comprises screw rod, and the screw rod leading portion is provided with the self-tapping type screw thread, and tail end is provided with inner polygon instrument embedded groove, it is characterized in that: described screw rod tail end also is provided with outer polygonal nut structure.

2. fracture of femoral neck pressurization hollow screw group according to claim 1, it is characterized in that: described inner polygon instrument embedded groove is relative with outer polygonal nut structure axial location and the limit number is identical, and inner polygon instrument embedded groove is corresponding parallel with each limit of polygon of outer polygonal nut structure.

3. fracture of femoral neck pressurization hollow screw group according to claim 2, it is characterized in that: described inner polygon instrument embedded groove is a hexagonal structure in regular hexagon becomes, and outer polygonal nut structure is that regular hexagon becomes the hex nut structure.

4. fracture of femoral neck pressurization hollow screw group according to claim 3 is characterized in that: between described outer polygonal nut structure and the screw rod annular stop boss is set.

5. fracture of femoral neck pressurization hollow screw group according to claim 4, it is characterized in that: preceding tapping screw thread that sets gradually before and after the self-tapping type screw thread comprises and back be tapping screw thread oppositely.

6. kit that is used for the described fracture of femoral neck of claim 1 pressurization hollow screw group, it is characterized in that: comprise torque arm, described torque arm front end is provided with the supporting outer polygon application of force head of inner polygon instrument embedded groove and is positioned at the outside and supporting inner polygon sleeve of outer polygonal nut of outer polygon application of force head.

7. the kit of fracture of femoral neck pressurization hollow screw group according to claim 6, it is characterized in that: the loop bar structure that loop bar and trocar sheath were formed in described torque arm was served as reasons, described outer polygon application of force head is arranged at interior loop bar front end, and described inner polygon sleeve is arranged at trocar sheath.

8. the kit of fracture of femoral neck pressurization hollow screw group according to claim 7, it is characterized in that: the loop bar tail end stretches out trocar sheath and fixedly installs handle in described, and the trocar sheath tail end is provided with horizontal shaft-like handle and forms T shape structure.

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