CN213190016U

CN213190016U - Reinforced torsion-resistant interlocking intramedullary nail for fixing fracture of lower part of femoral shaft

Info

Publication number: CN213190016U
Application number: CN202020982035.0U
Authority: CN
Inventors: 林凤飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-05-14
Anticipated expiration: 2030-06-02

Abstract

The utility model discloses a strengthen antitorque type interlocking intramedullary nail for fixing fracture department of femoral shaft lower part, include: the intramedullary nail body is used for fixing 1/3 fracture parts below the femoral shaft; the intramedullary nail body comprises a third rod head section and a third rod body section, a third proximal static locking hole is formed in the proximal end portion of the third rod head section, and a third distal static locking hole is formed in the distal end portion of the third rod body section; a third proximal static locking hole and a third distal dynamic locking hole are further formed in the third rod body section, the third distal dynamic locking hole is located at the distal end portion of the third rod body section, and the femoral shaft lower 1/3 fracture position is located between the third proximal static locking hole and the third distal dynamic locking hole. The utility model discloses a locking hole distribution position and the type that change the intramedullary nail have adjusted the stress distribution around the fracture position, have improved local mechanics environment, on the basis of maintaining intramedullary nail axial stability, have strengthened its anti-rotation ability.

Description

Reinforced torsion-resistant interlocking intramedullary nail for fixing fracture of lower 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 of lower part 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 a fracture of the lower 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 lower femoral shaft fracture, comprising:

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

Preferably, the center distance between the third proximal and third distal-most static locking holes is 1/3 of the center distance between the third proximal and third distal-most static locking holes.

Preferably, the center distance between the third distal dynamic locking hole and the third distal-most static locking hole is 1/10-1/7 of the center distance between the third proximal static locking hole and the third distal-most static locking hole.

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

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

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

Preferably, the third shaft section is cylindrical, the third shaft section is curved, the diameter of the third shaft section is greater than the outer major diameter of the third shaft section, the distal end of the third shaft section is provided with a third transition frustum portion which is connected with the third shaft section in a smooth transition manner, the distal end of the third shaft section is provided with a third end frustum portion in a smooth transition manner, and the end edge of the third end frustum portion is provided with a third fillet.

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

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

Preferably, the cross-section of the third shaft section is circular, quincunx, toothed or V-shaped.

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 fracture 1/3 below the femoral shaft, the intramedullary nail with 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: 300. an intramedullary nail body; 301. a third proximal static locking hole; 302. a third distal-most static locking hole; 303. a third proximal static locking hole; 304. a third distal power locking aperture; 310. a third club head section; 311. a third transition frustum portion; 312. a third reduced-pressure inclined plane; 320. a third shaft section; 321. a third tip frustum portion; 322. a third stress-reducing 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 a lower femoral shaft, comprising:

the intramedullary nail body 300 is used for fixing 1/3 fracture parts below the femoral shaft 500; the intramedullary nail body 300 comprises a third rod head section 310 and a third rod body section 320 which are distributed from near to far in sequence, wherein a proximal end part of the third rod head section 310 is provided with a third proximal static locking hole 301, and a distal end part of the third rod body section 320 is provided with a third distal static locking hole 302; the third shaft body section 320 is further provided with a third proximal static locking hole 303 and a third distal dynamic locking hole 304 which are distributed from near to far in sequence, the third distal dynamic locking hole 304 is positioned at the distal end part of the third shaft body section 320, and the lower 1/3 fracture part of the femoral shaft 500 is positioned between the third proximal static locking hole 303 and the third distal dynamic locking hole 304.

When 1/3 part of femoral shaft 500 is fractured, the intramedullary nail body 300 is inserted into the medullary cavity and is matched with the third proximal static locking hole 301, the third distal static locking hole 302, the third proximal static locking hole 303 and the third distal dynamic locking hole 304 through four screws 400. The third nearest static locking hole 301 and the third farthest static locking hole 302 are adopted, two ends are locked and fixed, static type fixing is achieved, the axial and rotary fixing effects are better, fracture displacement after fixing is prevented, and the application range is expanded. The third proximal static locking hole 303 and the third distal dynamic locking hole 304 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 third distal dynamic locking hole 304 is preferably an oblong locking hole extending along the length direction of the third shaft body section 320, so that the intramedullary nail body 300 can slide up and down at the third distal dynamic locking hole 304; 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 B3 between the third proximal and distal-most

static locking holes

303, 302 is 1/3 of the center distance A3 between the third proximal and distal-most static locking holes 301, 302.

In this embodiment, the center distance H3 between the third distal dynamic locking hole 304 and the third distal-most static locking hole 302 is 1/10-1/7 of the center distance A3 between the third proximal static locking hole 303 and the third distal-most static locking hole 302. Further, the center distance H3 between the third distal dynamic locking hole 304 and the third distal-most static locking hole 302 is preferably 1/9 to 1/8 times, such as 0.12 times, specifically 10 to 20mm, and preferably, but not limited to, 15mm of the center distance A3 between the third proximal static locking hole 303 and the third distal-most static locking hole 302.

In the embodiment, the distance L3 between the two end faces of the intramedullary nail body 300 is 360-420 mm, preferably but not limited to 380mm, 400 mm; the length F3 of the third head section 310 is 70-90 mm, preferably but not limited to 80 mm. Specifically, the length of the intramedullary nail body 300 can be selected according to male, female, adult and child patients, the length of a male can be 380-420 mm, the length of a female can be 360-400 mm, and the distance from the tip of the greater tuberosity 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 A3 between the third nearest static lock hole 301 and the third farthest static lock hole 302 is 360-390 mm, preferably but not limited to 370-380 mm, such as 376.8 mm. And the center distance B3 between the third proximal static locking hole 303 and the third most distal static locking hole 302 is 120-130 mm, preferably, but not limited to 125.6 mm. The distance E3 from the center of the third most distal static locking hole 302 to the most distal end face of the third shaft section 320 is 7-8 mm, preferably but not limited to 7.5 mm.

In the present embodiment, the outer major diameter R3 of the third shaft section 320 is 9-13 mm, preferably but not limited to 10-12 mm, such as 11 mm. Specifically, the outer major diameter of the third shaft section 320 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 this embodiment, the third shaft section 310 is cylindrical, the third shaft section 320 is curved, the diameter of the third shaft section 310 is greater than the outer major diameter of the third shaft section 320, the distal end of the third shaft section 310 is provided with a third transition frustum portion 311 in smooth transition connection with the third shaft section 320, the distal end of the third shaft section 320 is provided with a third end frustum portion 321 in smooth transition, and the end edge of the third end frustum portion 321 is provided with a third rounded corner.

In this embodiment, the convex side of the distal end of the third shaft segment 320 is provided with a third stress-reducing groove 223. The distal end portion of the third stem head section 310 is symmetrically provided with a third decompression inclined plane 312 at the front-rear side, and the third decompression inclined plane 312 extends from the third stem head section 310 to the distal end of the third transition frustum portion 311. Wherein half of said third reduced-pressure inclined plane 312 is located on the outer surface of the third stem head section 310 and the other half of said third reduced-pressure inclined plane 312 is located on the outer surface of the third transition frustum portion 311.

In this embodiment, the cross-section of the third shaft section 320 is preferably circular, quincunx (as shown), toothed, V-shaped, or the like.

In this embodiment, the intramedullary nail body 300 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. A strengthened torsion-resistant interlocking intramedullary nail for fixation of a fracture of the lower femoral shaft, comprising:

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

3. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a lower femoral shaft fracture of claim 1, wherein: the center distance between the third distal dynamic locking hole and the third distal-most static locking hole is 1/10-1/7 of the center distance between the third proximal static locking hole and the third distal-most static locking hole.

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

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

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

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

8. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a lower femoral shaft fracture of claim 7, wherein: the convex side of the distal end part of the third shaft section is provided with a third stress-reducing groove.

9. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a lower femoral shaft fracture of claim 7, wherein: and a third decompression inclined plane is symmetrically arranged at the front side and the rear side of the distal end part of the third club head section, and the third decompression inclined plane extends from the third club head section to the distal end of the third transition frustum part.

10. The strengthened torsion-resistant interlocking intramedullary nail for fixation of a lower femoral shaft fracture of claim 1, wherein: the cross section of the third rod body section is circular, quincunx, tooth-shaped or V-shaped; the intramedullary nail body is made of stainless steel, titanium alloy, chromium-cobalt alloy or cobalt-nickel alloy.