CN202179588U

CN202179588U - Intramedullary nail for tibia

Info

Publication number: CN202179588U
Application number: CN2011201940410U
Authority: CN
Inventors: 张强; 王岩; 郑诚功
Original assignee: Chinese PLA General Hospital; Beijing Naton Technology Group Co Ltd
Current assignee: Chinese PLA General Hospital; Beijing Naton Technology Group Co Ltd
Priority date: 2011-05-17
Filing date: 2011-06-10
Publication date: 2012-04-04
Anticipated expiration: 2021-06-10
Also published as: CN102784002B; CN102784002A

Abstract

The utility model relates to a novel tibial intramedullary nail, which comprises a proximal end L1 (1), a distal end L2 (2) suitable for being inserted into the medullary cavity, the center line of the proximal end (1) and the longitudinal axis of the intramedullary nail The angle a between them is 18°-22°. The intramedullary nail can use the inner edge of the patellar key and the upper edge of the tibial swan-foot insertion as the needle entry point, avoiding damage to the patellar ligament, thereby avoiding postoperative prepatellar pain.

Description

Tibial intramedullary nailing

Technical field

This utility model relates to the orthopedic fixation device tool, relates in particular to a kind of intramedullary pin.

Background technology

Tibial intramedullary nailing is the inner fixing device that is used for treating fracture of shaft of tibia; Tibial intramedullary nailing in the market all is to select through patellar ligament tibial tubercle upper limb approach inserting needle when implanting; Cause the damage of patellar ligament and adjacent soft tissue; Aseptic inflammations such as tissue adhesion, this surgical technic shortcoming are that the preceding pain of obstinate kneecap appears in patient's postoperative.If patient's misoperation in addition, the afterbody screw exceeds cortical bone, also can stimulate kneecap tendon surrounding soft tissue to cause pain, has had a strong impact on patient's life quality.

Summary of the invention

This utility model is to the deficiency of existing intramedullary pin; A kind of preceding medial approach tibial intramedullary nailing is provided; Through kneecap tendon inner edge and tibia pes anserinus stop upper limb entry point, patellar ligament is caused damage when avoiding inserting needle, and then avoid the generation of pain before the fracture of tibia patient postoperative kneecap as intramedullary pin.

The technical scheme that solves the problems of the technologies described above is:

The tibial intramedullary nailing of this utility model comprises that a near-end L1, is applicable to the far-end L2 that is inserted in the pulp cavity, and the angle a between proximal hub line and the intramedullary pin longitudinal axis is 18 °-22 °.

Preferably, the proximal hub line of this utility model tibial intramedullary nailing and the angle a between the intramedullary pin longitudinal axis are 20 °.

Preferably, have the transition segmental arc between the near-end of this utility model tibial intramedullary nailing and the far-end, radius of curvature R 1 is 50mm.

Preferably, the far-end of this utility model tibial intramedullary nailing comprises that the angle b between the centrage of the centrage of far-end epimere and far-end hypomere is 0 °-4 ° near the far-end epimere m of near-end with away from the far-end hypomere n of near-end.

Preferably, have the transition segmental arc between the far-end epimere m of this utility model tibial intramedullary nailing and the far-end hypomere n, radius of curvature R 2 is 1500mm.

Preferably, the near-end of this utility model tibial intramedullary nailing also comprises at least one lock hole, said lock hole centrage and proximal hub line intramedullary pin near-end and distal center line angle c on the whole be 80 °.

Preferably, the near-end of this utility model tibial intramedullary nailing also comprises at least one pressurization hole, and said pressurization centerline hole is 30 ° at the angle d with intramedullary pin near-end and distal center line place face.

Preferably; The far-end of this utility model tibial intramedullary nailing comprises at least 2 lock holes; The angle e of projection and near-end and the distal center line place face of the centrage in said 2 far-end locking holes on the cross section of intramedullary pin and f sum are greater than 0 °, smaller or equal to 90 °.

The preceding medial approach tibial intramedullary nailing that this utility model provides is compared with existing tibial intramedullary nailing; Select kneecap tendon inner edge and tibia pes anserinus stop upper limb as the intramedullary pin entry point in the time of can realizing implanting; Make entry point and intramedullary pin near-end avoid patellar ligament like this; Avoided damage, thereby avoided the preceding pain of postoperative kneecap patellar ligament.The tibial intramedullary nailing of this utility model is rational in infrastructure, and function admirable can be carried out good coupling with the tibia pulp cavity, reaches effective treatment fracture of tibia and improves the good result of patient's life quality.

Description of drawings

Fig. 1 is the front view of this utility model tibial intramedullary nailing;

Fig. 2 is the profile of Fig. 1;

Fig. 3 is the A-A line cutaway view along Fig. 1;

Fig. 4 is along the B-B line of Fig. 1 and C-C line cutaway view;

Identifier declaration is following among the figure:

The 1-near-end, 2-far-end, 3-near-end lock hole, 4-near-end pressurization hole, 5-far-end locking hole.

The specific embodiment

For the purpose, technical scheme and the advantage that make this utility model is clearer,, this utility model is further specified below in conjunction with accompanying drawing.Specific embodiment described herein is only in order to explaining this utility model, and is not used in qualification this utility model.

As shown in Figure 1, the medial approach tibial intramedullary nailing comprises that a near-end 1, one are applicable to the far-end 2 that inserts pulp cavity before this utility model, and near-end 1 is the part of diagram L1 length, and far-end 2 is the part of diagram L2 length.Angle a between near-end 1 centrage and the intramedullary pin longitudinal axis is 18 °-22 °.The intramedullary pin longitudinal axis is meant and passes through intra medullary nail far-end z axis vertically on the figure one that centrage is meant along the line of intramedullary pin axis direction.In a most preferred embodiment, the angle a between near-end 1 centrage and the intramedullary pin longitudinal axis is 20 °.In addition, far-end 2 comprises that also the angle b between the centrage of the centrage of far-end epimere m and far-end hypomere n is 0 °-4 ° near the far-end epimere m of near-end 1 with away from the far-end hypomere n of near-end 1.The near-end 1 and the far-end 2 of this utility model intramedullary pin have a transition segmental arc; Circular arc radius of curvature R 1 is 50mm; Also can have a transition segmental arc near the far-end epimere m of near-end 1 and far-end hypomere n away from near-end 1 on the far-end 2, circular arc radius of curvature R 2 is 1500mm.The diameter of phi d of near-end 1 is 11.5mm or 13mm.Intramedullary pin integral body is hollow or solid design.This structure Design meets the anatomical features of tibia pulp cavity, can carry out good coupling with the tibia pulp cavity.Particularly, the design of this angle has guaranteed the preceding medial approach mode of intramedullary pin at kneecap tendon inner edge and tibia pes anserinus stop upper limb, can effectively avoid the preceding pain of postoperative kneecap, improves patient's life quality.

As shown in Figure 2, according to bone structure and osseous tissue different characteristics, the near-end 1 of the tibial intramedullary nailing of this utility model also comprises one or more lock hole 3, one or more pressurizations hole 4.The centrage of near-end 1 and far-end 2 in one plane, with the dissection surface of this plane as intramedullary pin.Near-end lock hole 3 centrages and the proximal hub line angle c on the intramedullary pin dissection surface is 80 °.As shown in Figure 3, the angle d of near-end pressurization hole 4 centrages and intramedullary pin dissection surface is 30 °.The angle design in near-end lock hole and near-end pressurization hole can realize the near-end cross lock preferably, can be better fixing fracture end.

As shown in Figure 4, the number in the far-end locking hole 5 of this utility model tibial intramedullary nailing is at least 2, and the dissection surface angle e of projection and the intramedullary pin of wherein any 2 far-end locking holes 5 on the cross section of intramedullary pin and f sum are greater than 0 °, smaller or equal to 90 °.This structural design can realize intra medullary nail far-end position cross lock preferably, thereby fracture end is carried out good fixing.

In addition, the medial approach tibial intramedullary nailing can be that an angle is arranged between intramedullary pin near-end 1 centrage and intramedullary pin longitudinal axis before this utility model, and its proximal part and distal portions are linear structure, do not have any bending; Can also be that an angle is arranged between intramedullary pin near-end 1 centrage and intramedullary pin longitudinal axis, its distal portions integral body be the arcuate structure that matees with pulp cavity.

The preceding medial approach tibial intramedullary nailing that this utility model provides is compared with existing tibial intramedullary nailing; Select kneecap tendon inner edge and tibia pes anserinus stop upper limb preceding medial approach mode in the time of can realizing implanting as the intramedullary pin entry point; Make entry point and intramedullary pin near-end avoid patellar ligament like this; Avoided damage, thereby avoided the preceding pain of postoperative kneecap patellar ligament, significant to the life quality that improves patient.

Claims

1. A tibial intramedullary nail, comprising a proximal end L1 (1) and a distal end L2 (2) suitable for insertion into the medullary cavity, characterized in that the centerline of the proximal end (1) is aligned with the longitudinal direction of the intramedullary nail. The angle a between the axes is 18°-22°.

2. The tibial intramedullary nail according to claim 1, characterized in that the angle a between the centerline of the proximal end (1) and the longitudinal axis of the intramedullary nail is 20°.

3. The tibial intramedullary nail according to claim 1, characterized in that there is a transition arc section between the proximal end (1) and the distal end (2), and the curvature radius R1 is 50 mm.

4. The tibial intramedullary nail according to claim 1, 2 or 3, characterized in that, the distal end (2) includes a distal upper segment m close to the proximal end (1) and a distal end segment far away from the proximal end (1). The lower segment n, the angle b between the center line of the upper segment of the distal end and the lower segment of the distal end is 0°-4°.

5 . The tibial intramedullary nail according to claim 4 , wherein there is a transitional arc section between the upper segment m of the distal end and the lower segment n of the distal end, and the radius of curvature R2 is 1500 mm.

6. The tibial intramedullary nail according to claim 1, 2 or 3, characterized in that, the proximal end (1) includes at least one locking hole (3), and the centerline of the locking hole and the centerline of the proximal end (1) The included angle c between the planes where the centerlines of the proximal end and the distal end are located is 80°.

7. The tibial intramedullary nail according to claim 1 or 2, characterized in that, the proximal end (1) further comprises at least one pressure hole (4), and the center line of the pressure hole is connected to the center of the proximal end and the distal end. The angle d between the planes where the lines lie is 30°.

8. The tibial intramedullary nail according to claim 1, characterized in that, the distal end comprises at least two distal locking holes (5).

9. The tibial intramedullary nail according to claim 8, characterized in that the projection of the centerlines of the two distal locking holes (5) on the cross-section of the intramedullary nail is the same as the proximal and distal centerlines The sum of the included angles e and f of the surface is greater than 0° and less than or equal to 90°.