CN213075871U

CN213075871U - Reinforced torsion-resistant interlocking intramedullary nail for fixing fracture of upper part of femoral shaft

Info

Publication number: CN213075871U
Application number: CN202020983809.1U
Authority: CN
Inventors: 林凤飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-04-30
Anticipated expiration: 2030-06-02

Abstract

The utility model discloses a strengthen antitorque type interlocking intramedullary nail for fixing fracture department on upper portion of femoral shaft, include: the intramedullary nail body is used for fixing 1/3 fracture parts on the femoral shaft; the intramedullary nail body comprises a first rod head section and a first rod body section which are distributed from near to far in sequence, a first proximal static locking hole is formed in the proximal end portion of the first rod head section, and a first distal static locking hole is formed in the distal end portion of the first rod body section; the first rod head section is further provided with a first near-end dynamic locking hole, the first near-end dynamic locking hole is located at the far end part of the first rod head section, the first rod body section is further provided with a first far-end static locking hole, and 1/3 fracture positions on the femoral shaft are located between the first near-end dynamic locking hole and the first far-end static locking hole. The utility model adjusts the stress distribution around the fracture part by changing the distribution position and type of the locking holes of the intramedullary nail, and enhances the anti-rotation capability of the intramedullary nail on the basis of maintaining the axial stability of the intramedullary nail.

Description

Reinforced torsion-resistant interlocking intramedullary nail for fixing fracture of upper part of femoral shaft

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to strengthen antitorque type interlocking intramedullary nail for fixing fracture department on upper portion of femoral shaft.

Background

The femur is the longest tubular bone in a human body, and the femoral shaft comprises a shaft 2-5 cm below the tuberosity to 2-5 cm above the femoral condyle. When the femoral shaft is fractured, an interlocking intramedullary nail is adopted for fixation at present, static locking screw holes are respectively formed in the most proximal end and the most distal end of the interlocking intramedullary nail, and the most proximal end and the most distal end of the femoral shaft are fixed through screw interlocking respectively. The traditional interlocking intramedullary nail fixing method with the structure has the following defects: the specific occurrence position and type of the femoral shaft fracture are not determined, and one cutting tool is fixed by a static force, so that the stress around the fracture part is concentrated, the screw distances at two ends of the fracture part are far, the local mechanical environment is poor, the anti-rotation capability is poor, and the fracture healing is not facilitated.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, the present invention provides a strengthened torsion-resistant interlocking intramedullary nail for fixing the fracture of the upper part of the femoral shaft.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper part of the femoral shaft, comprising:

the intramedullary nail body is used for fixing 1/3 fracture parts on the femoral shaft; the intramedullary nail body comprises a first rod head section and a first rod body section which are distributed from near to far in sequence, a first proximal static locking hole is formed in the proximal end portion of the first rod head section, and a first distal static locking hole is formed in the distal end portion of the first rod body section; the first rod head section is further provided with a first near-end dynamic locking hole, the first near-end dynamic locking hole is located at the far end portion of the first rod head section, the first rod body section is further provided with a first far-end static locking hole, and 1/3 fracture positions on the femoral shaft are located between the first near-end dynamic locking hole and the first far-end static locking hole.

Preferably, the center distance between the first nearest and distal static locking holes is 1/3 of the center distance between the first nearest and distal static locking holes.

Preferably, the distance between the two end faces of the intramedullary nail body is 360-420 mm, and the length of the first rod head section is 70-90 mm.

Preferably, the center distance between the first nearest static locking hole and the first farthest static locking hole is 360-390 mm; the distance from the center of the first farthest static force locking hole to the farthest end face of the first rod body section is 7-8 mm.

Preferably, the outer major diameter of the first shaft section is 9-13 mm.

Preferably, first shaft section is cylindrical, first shaft section is the bending shape, the diameter of first shaft section is greater than the outer major diameter of first shaft section, the distal end of first shaft section is provided with the first transition frustum portion of being connected with first shaft section smooth transition, the distal end of first shaft section is provided with the first end frustum portion of smooth transition, the terminal edge of first end frustum portion is provided with first radius angle.

Preferably, the convex side of the distal end of the first shaft segment is provided with a first stress-reducing groove.

Preferably, the distal end portion of the first head section is symmetrically provided with a first decompression inclined plane in front-rear side, the first decompression inclined plane extending from the first head section to the distal end of the first transition frustum portion.

Preferably, the first shaft section has a circular, quincunx, toothed or V-shaped cross-section.

Preferably, the intramedullary nail body is made of stainless steel, titanium alloy, chromium-cobalt alloy or cobalt-nickel alloy.

Compared with the prior art, the utility model discloses following beneficial effect has: according to the 1/3 fracture on the femoral shaft, the intramedullary nail with the corresponding locking hole distribution is designed, the stress distribution around the fracture part is adjusted by changing the distribution position and the specific type of the locking holes of the intramedullary nail, the local mechanical environment is improved, the anti-rotation capability of the intramedullary nail is enhanced on the basis of maintaining the axial stability of the intramedullary nail, the occurrence of rotation, shortening and angulation deformity is effectively prevented, the stability of the fracture end is improved, the active osteogenesis of a bone healing unit is facilitated, and the occurrence of bone nonunion is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic usage diagram of an embodiment of the present invention.

The labels in the figure are: 100. an intramedullary nail body; 101. a first proximal-most static locking hole; 102. a first distal-most static locking hole; 103. a first proximal power locking aperture; 104. a first distal static locking hole; 110. a first club head section; 111. a first transition frustum portion; 112. a first reduced-pressure inclined plane; 120. a first shaft section; 121. a first end cone portion; 122. a first stress relief groove; 400. a screw; 500. the femoral shaft.

Detailed Description

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1-2, the present embodiment provides a strengthened torsion-resistant interlocking intramedullary nail for fixing a fracture of the upper part of the femoral shaft, comprising:

the intramedullary nail body 100 is used for fixing 1/3 fracture parts on the femoral shaft 500; the intramedullary nail body 100 comprises a first rod head section 110 and a first rod body section 120 which are distributed from near to far in sequence, a first proximal static locking hole 101 is formed in the proximal end portion of the first rod head section 110, and a first distal static locking hole 102 is formed in the distal end portion of the first rod body section 120; the first shaft head section 110 is further provided with a first proximal dynamic locking hole 103, the first proximal dynamic locking hole 103 is located at the distal end portion of the first shaft head section 110, the first shaft body section 120 is further provided with a first distal static locking hole 104, and the fracture site 1/3 on the femoral shaft 500 is located between the first proximal dynamic locking hole 103 and the first distal static locking hole 104.

When 1/3 on the femoral shaft 500 is fractured, the intramedullary nail body 200 is inserted into the medullary cavity and is matched with the first proximal most static locking hole 101, the first distal most static locking hole 102, the first proximal dynamic locking hole 103 and the first distal static locking hole 104 through four screws 400. By adopting the first nearest static locking hole 101 and the first farthest static locking hole 102, the nearest end and the farthest end are locked and fixed, static type fixation is realized, better axial and rotary fixation effects are achieved, fracture displacement after fixation is prevented, and the application range of the device is expanded. The first proximal dynamic locking hole 103 and the first distal static locking hole 104 are adopted, one end is locked and fixed, and the other end slides, so that dynamic fixation is realized, and the healing of bones can be promoted; wherein the first proximal dynamic locking hole 103 is preferably an oblong locking hole extending along the length direction of the first rod head section 110, so that the intramedullary nail body 100 can slide up and down at the first proximal dynamic locking hole 103; the length G of the oblong locking hole is preferably, but not limited to, 10-14 mm, such as 11-13 mm, and more specifically, 12 mm.

In this embodiment, the center distance B1 between the first proximal most static locking hole 101 and the first distal most static locking hole 104 is 1/3 of the center distance a1 between the first proximal most static locking hole 101 and the first distal most static locking hole 102.

In the embodiment, the distance L1 between the two end faces of the intramedullary nail body 100 is 360-420 mm, preferably but not limited to 380mm, 400 mm; the length F1 of the first club head section 110 is 70-90 mm, preferably but not limited to 80 mm. Specifically, the length of the intramedullary nail body 100 can be selected according to male, female, adult and child patients, the length of the male can be 380-420 mm, the length of the female can be 360-400 mm, and the distance from the greater tuberosity tip of the femur to the upper edge of the patella can be measured through a standard X-ray, namely the length of the intramedullary nail.

In this embodiment, the center distance A1 between the first proximal-most static locking hole 101 and the first distal-most static locking hole 102 is 360-390 mm, preferably but not limited to 370-380 mm, such as 376.8 mm. The center distance B1 between the first nearest static locking hole 101 and the first far static locking hole 104 is 120-130 mm, preferably but not limited to 125.6 mm. The distance E1 from the center of the first most distal static locking hole 102 to the most distal end face of the first shaft section 120 is 7-8 mm, preferably but not limited to 7.5 mm.

In the present embodiment, the outer major diameter R1 of the first shaft section 120 is 9-13 mm, preferably but not limited to 10-12 mm, such as 11 mm. Specifically, the outer major diameter of the first shaft section 120 can be selected according to male, female, adult and child patients, the diameter of the male can be selected to be 10-13 mm, the diameter of the female can be 9-12 mm, the transverse diameter of the narrowest part of the medullary cavity of the patient can be measured by a standard X-ray, and the thickness of the intramedullary nail is obtained by subtracting 10% from the transverse diameter.

In the present embodiment, the first shaft section 110 is cylindrical, the first shaft section 120 is curved, the diameter of the first shaft section 110 is greater than the outer major diameter of the first shaft section 120, the distal end of the first shaft section 110 is provided with a first transition frustum portion 111 in smooth transition connection with the first shaft section 120, the distal end of the first shaft section 120 is provided with a first end frustum portion 121 in smooth transition, and the end edge of the first end frustum portion 121 is provided with a first rounded corner.

In this embodiment, the convex side of the distal end of the first shaft segment 120 is provided with a first stress-relief groove 122. The distal end portion of the first stem head section 110 is symmetrically provided with a first decompression inclined plane 112 at the front-rear side, and the first decompression inclined plane 112 extends from the first stem head section 110 to the distal end of the first transition frustum portion 111. Wherein half of said first decompression inclined plane 112 is located on the outer surface of the first stem head section 110 and the other half of said first decompression inclined plane 112 is located on the outer surface of the first transition frustum portion 111.

In this embodiment, the cross-section of the first shaft section 120 is preferably circular, quincunx (as shown), toothed, V-shaped, or the like.

In this embodiment, the intramedullary nail body 100 is preferably made of stainless steel, titanium alloy, chromium-cobalt alloy, cobalt-nickel alloy, or the like.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art should not depart from the technical scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the scope of the present invention.

Claims

1. An enhanced torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper part of the femoral shaft, comprising:

2. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: the center distance between the first nearest and distal static locking holes is 1/3 times the center distance between the first nearest and distal static locking holes.

3. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: the distance between the two end faces of the intramedullary nail body is 360-420 mm, and the length of the first rod head section is 70-90 mm.

4. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: the center distance between the first nearest static locking hole and the first farthest static locking hole is 360-390 mm; the distance from the center of the first farthest static force locking hole to the farthest end face of the first rod body section is 7-8 mm.

5. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: the outer major diameter of the first rod body section is 9-13 mm.

6. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: first shaft section is cylindrical, first shaft section is crooked shape, the diameter of first shaft section is greater than the outer major diameter of first shaft section, the distal end of first shaft section is provided with the first transition frustum portion of being connected with first shaft section smooth transition, the distal end of first shaft section is provided with smooth transition's first end frustum portion, the terminal edge of first end frustum portion is provided with first radius angle.

7. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 6, wherein: the convex side of the far end part of the first rod body segment is provided with a first stress reduction groove.

8. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 6, wherein: the distal end portion of the first head section is symmetrically provided with first decompression inclined planes at front and rear sides, and the first decompression inclined planes extend from the first head section to the distal end of the first transition frustum portion.

9. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: the cross section of the first rod body section is circular, quincunx, tooth-shaped or V-shaped.

10. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the upper femoral shaft of claim 1, wherein: the intramedullary nail body is made of stainless steel, titanium alloy, chromium-cobalt alloy or cobalt-nickel alloy.