CN213217539U

CN213217539U - PFNA intramedullary nail

Info

Publication number: CN213217539U
Application number: CN202021145297.8U
Authority: CN
Inventors: 李正戎; 史春宝; 郭静; 王振国
Original assignee: Hebei Chunli Hangnuo New Material Technology Co ltd
Current assignee: Hebei Chunli Hangnuo New Material Technology Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-05-18
Anticipated expiration: 2030-06-19

Abstract

The utility model relates to the technical field of medical equipment, a PFNA intramedullary nail is provided. The method comprises the following steps: the main nail, the spiral blade, the transverse locking nail and the tail nail; the main nail is provided with a main nail body, the near end of the main nail body is provided with a spiral blade, the far end of the main nail body is provided with a transverse locking nail, and the tail part of the near end of the main nail body is provided with a tail nail; the proximal and distal ends of the main nail body have a 6 ° flared bend. The beneficial effects of the utility model reside in that: the curvature radius of the far end of the main nail is reduced, meanwhile, the near end and the far end of the main nail are provided with the 6-degree outward-extending bending, so that the main nail is more tightly attached to a femoral medullary cavity, the femur anatomical form is optimally matched in practical application, the operation convenience of the intramedullary nail is improved, the stress concentration caused by mismatching of the intramedullary nail and the femoral medullary cavity can be avoided, the postoperative pain of a patient is reduced, and the nail tip is effectively prevented from impacting a cortical bone or penetrating out the cortical bone to cause recrush.

Description

PFNA intramedullary nail

Technical Field

The utility model relates to the technical field of medical equipment, more specifically say, relate to a PFNA intramedullary nail.

Background

The PFNA intramedullary nail, namely the femoral interlocking intramedullary nail, is a fracture intramedullary fixing device with wide application, and comprises a long rod component main nail implanted into a femoral medullary cavity of a patient, a proximal locking component helical blade implanted into a femoral neck and a femoral head from a femoral cortex, a distal femoral interlocking component interlocking screw and a main nail end component tail nail. And the main nail has a certain anatomical radian, and for long tubular femoral fractures, the intramedullary nail better conforms to the biomechanical characteristics of the femur. The proximal end of the main nail is provided with an inclined locking perforation, the distal end of the main nail is provided with one or two transverse locking perforations, and in the operation of treating femoral fracture by intramedullary nail, the main nail is implanted into a femoral medullary cavity and then locked at the proximal end by the spiral blade and locked at the distal end by the interlocking screw, so as to prevent the fracture end from moving up and down and twisting.

The bending curvature of PFNA intramedullary nail main nail distal end is great now, the radius value is in 1300mm to 2000mm and varies, stronger pertinence has, to the great crowd of thighbone physiology radian, the radian is dissected with the better laminating of human femoral medullary cavity physiology radian ability to main nail distal end, nevertheless to the less crowd of thighbone physiology radian, main nail distal end radian can not with the better laminating of femoral medullary cavity physiology radian of this kind of crowd, stress concentration takes place the broken nail phenomenon easily to appear, main nail distal end is to the medullary cavity extrusion, cause the intramedullary nail distal end to wear out the cortical bone, lead to thighbone fracture etc. again.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a PFNA intramedullary nail to solve the technical problem existing in the prior art.

In order to achieve the above object, the utility model adopts the following technical scheme: a PFNA intramedullary nail comprising: the main nail, the spiral blade, the transverse locking nail and the tail nail; the main nail is provided with a main nail main body, a main nail near-end lock hole is formed in the near end of the main nail main body, the spiral blade penetrates through the main nail near-end lock hole and is connected to the near end of the main nail main body, and the spiral blade penetrates through the main nail near-end lock hole; the far end of the main nail main body is provided with a main nail far end lock hole, the transverse lock nail is connected to the far end of the main nail main body in a penetrating manner through the main nail far end lock hole, and the transverse lock nail extends out of the main nail far end lock hole; the proximal end and the distal end of the main nail body are provided with a flared bend of 6 degrees; the curvature radius of the far-end nail body of the main nail body is 1150 mm.

In an optional embodiment, the spiral blade is provided with a spiral blade head, a threaded connecting rod, a tail cap and a sleeve, one end of the threaded connecting rod is embedded in a groove at one end of the spiral blade head, an external thread of the threaded connecting rod is connected with an internal thread of the tail cap, the tail cap is connected to the inner side of the sleeve, and a barb is arranged on the outer side of one end of the tail cap and hooks on a boss on the inner side of the sleeve for limiting.

In an optional embodiment, the shape of the outer side of the sleeve and the shape of the proximal lock hole of the main nail are matched in a non-circular lemon shape, and the spiral blade is locked in the proximal lock hole of the main nail.

In an alternative embodiment, the tail nail is screwed into the proximal tail of the main nail body, and the distal end of the tail nail is in contact with the helical blade to pressurize the helical blade.

In an optional embodiment, the lock hole at the far end of the main nail comprises a round lock hole and a long lock hole, when a patient is osteoporosis, the round lock hole is selected, and after the transverse lock nail is implanted into the round lock hole, the main nail is statically locked; when the bone of the patient is hard, the long lock hole is selected, and after the transverse lock nail is implanted into the long lock hole, the main nail is dynamically locked and can slightly move in the axis direction of the femur.

The beneficial effects of the utility model reside in that:

(1) the utility model provides a PFNA intramedullary nail has reduced the radius of curvature of main nail distal end, the near-end of main nail has 6 abduction bendings with the distal end simultaneously, make it with the inseparabler laminating of femoral medullary cavity, the best thighbone dissection form that has matchd in practical application, the operation convenience of intramedullary nail has been improved, can avoid because the intramedullary nail is unmatched with femoral medullary cavity and the stress concentration that leads to, patient's postoperative is painful, effectively prevent nail point striking cortex bone or wear out the cortex bone and lead to the fracture again.

(2) The utility model provides a PFNA intramedullary nail's helical blade comprises sleeve, threaded connection pole, tail cap and helical blade head, and after the helical blade head inserted the femoral head, the helical blade head had the helicla flute, had fine packing effect to the sclerotin, has increased the power of controlling of blade, improves the stability of near-end interlocking.

(3) The utility model provides a tail nail distal end and the helical blade contact in the PFNA intramedullary nail, carry out the pressure boost to the helical blade, the stability of further increase near-end interlocking.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of a PFNA intramedullary nail according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a main nail according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a helical blade according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a transverse locking pin according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of the tail nail according to an embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of a proximal locking hole of a main nail according to an embodiment of the present invention.

Fig. 7 is a schematic top view of a sleeve according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a threaded connection rod according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a tail cap according to an embodiment of the present invention.

Wherein, the reference numbers in the figures are: 1. the main nail comprises, by weight, 1-1 parts of a main nail body, 1-2 parts of a main nail proximal end locking hole, 1-3 parts of a main nail distal end locking hole, 2 parts of a spiral blade, 2-1 parts of a sleeve, 2-2 parts of a threaded connecting rod, 2-3 parts of a tail cap, 2-4 parts of a spiral blade head, 3 parts of a transverse locking nail, and 4 parts of a tail nail.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

Referring to fig. 1-5, the present embodiment provides a PFNA intramedullary nail, as shown in fig. 1, comprising: the nail-locking device comprises a main nail 1, a spiral blade 2, a transverse locking nail 3 and a tail nail 4; the main nail 1 is provided with a main nail body 1-1, a spiral blade 2 is arranged at the near end of the main nail body 1-1, a transverse locking nail 3 is arranged at the far end of the main nail body 1-1, and a tail nail 4 is arranged at the tail part of the near end of the main nail body 1-1.

In the embodiment, the proximal end and the distal end of the main nail body 1-1 are provided with the abduction bends of 6 degrees, so that the main nail body conforms to the femoral anatomy, is convenient to implant from the greater trochanter, is simple to operate and has small influence on the femoral blood circulation. The curvature radius of the nail body at the far end of the main nail body 1-1 is 1150mm, the curvature radius of the nail body at the far end of the main nail body 1-1 is smaller, the front arch radian of human femur anatomy is met, the fit degree with a medullary cavity is high, resistance when the main nail is inserted is reduced, nail tip contact and impact on femur cortex or the nail tip are prevented from penetrating out of the cortex bone, and pain and postoperative accidents caused by stress concentration can be effectively avoided.

Specifically, a main nail near-end lock hole 1-2 is formed in the near end of the main nail main body 1-1, the spiral blade 2 penetrates through the main nail near-end lock hole 1-2 and is connected to the near end of the main nail main body 1-1, and the spiral blade 2 penetrates through the main nail near-end lock hole 1-2. The far end of the main nail main body 1-1 is provided with a main nail far end lock hole 1-3, the transverse lock nail 3 is connected to the far end of the main nail main body 1-1 in a penetrating way through the main nail far end lock hole 1-3, and the transverse lock nail 3 extends out of the main nail far end lock hole 1-3. The main nail far-end lock hole 1-3 comprises a circular lock hole and a long lock hole, when a patient is osteoporosis, the circular lock hole is selected, and after the transverse lock nail 3 is implanted into the circular lock hole, the main nail 1 is statically locked, so that the far end of the main nail 1 is prevented from being loosened; when the bone of the patient is hard, the long lock hole is selected, after the transverse lock nail 3 is implanted into the long lock hole, the main nail 1 is dynamically locked, and the main nail 1 can slightly move in the axis direction of the femur to stimulate the broken end of the fracture, thereby being beneficial to the healing of the broken end of the fracture.

In addition, the spiral blade 2 is provided with a spiral blade head 2-4, a threaded connecting rod 2-2, a tail cap 2-3 and a sleeve 2-1, one end of the threaded connecting rod 2-2 is embedded in a groove at one end of the spiral blade head 2-4, an external thread of the threaded connecting rod 2-2 is connected with an internal thread of the tail cap 2-3, the tail cap 2-3 is connected to the inner side of the sleeve 2-1, as shown in the attached figures 8-9, an inverted hook is arranged on the outer side of one end of the tail cap 2-3 and is hooked on an inner side boss of the sleeve 2-1 for limiting. As shown in figures 6-7, the outer side shape of the sleeve 2-1 and the shape of the main nail near-end lock hole 1-2 are matched in a non-circular lemon shape, and the locking spiral blade 2 is arranged in the main nail near-end lock hole 1-2. It is worth mentioning that the tail nail 4 is screwed into the tail part of the near end of the main nail body 1-1, and the far end of the tail nail 4 is contacted with the spiral blade 2 to pressurize the spiral blade 2, so as to further increase the stability of near end interlocking.

It should be noted that the helical blade 2 is transported in a locked state, before the helical blade 2 is inserted, the helical blade 2 is unlocked, then the helical blade is inserted into the femoral neck and the femoral head through the guide pin, is connected to the main nail near-end lock hole 1-2 in a penetrating manner and extends out of the lock hole, after the helical blade is inserted, the helical blade 2 is locked, and the near-end interlocking is completed. After the near-end interlocking is completed, the main nail far-end lock hole 1-3 is interlocked through an auxiliary instrument, the transverse lock nail is implanted into the far-end cortex of the femur and penetrates out of the contralateral cortex, and the transverse lock nail penetrates through the main nail far-end lock hole 1-3 and extends out of the lock hole, so that the far-end interlocking is completed. After the distal end interlocking is accomplished, take off the auxiliary instrument who is connected with main nail 1, twist into 1 tip of main nail with tail nail 4, prevent that the sclerotin from growing into 1 tip threaded hole of main nail, and the installation back of tail nail 4, 4 distal ends of tail nail and the contact of helical blade 2, carry out the pressure boost to helical blade 2, the stability of further increase near-end interlocking.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A PFNA intramedullary nail comprising: the nail-locking device comprises a main nail (1), a spiral blade (2), a transverse locking nail (3) and a tail nail (4); the main nail (1) is provided with a main nail main body (1-1), a main nail near-end lock hole (1-2) is formed in the near end of the main nail main body (1-1), the spiral blade (2) penetrates through the main nail near-end lock hole (1-2) and is connected to the near end of the main nail main body (1-1), and the spiral blade (2) penetrates out of the main nail near-end lock hole (1-2); the far end of the main nail main body (1-1) is provided with a main nail far end lock hole (1-3), the transverse lock nail (3) is connected to the far end of the main nail main body (1-1) in a penetrating manner through the main nail far end lock hole (1-3), and the transverse lock nail (3) extends out of the main nail far end lock hole (1-3);

the method is characterized in that: the proximal end and the distal end of the main nail body (1-1) are provided with a flared bend of 6 degrees; the curvature radius of the far-end nail body of the main nail body (1-1) is 1150 mm.

2. The PFNA intramedullary nail of claim 1, wherein the helical blade (2) has a helical blade head (2-4), a threaded connection rod (2-2), a tail cap (2-3) and a sleeve (2-1), one end of the threaded connection rod (2-2) is embedded in a groove at one end of the helical blade head (2-4), an external thread of the threaded connection rod (2-2) is connected with an internal thread of the tail cap (2-3), the tail cap (2-3) is connected to the inner side of the sleeve (2-1), an external side of one end of the tail cap (2-3) is provided with a barb which is hooked on an inner boss of the sleeve (2-1) for limiting.

3. The PFNA intramedullary nail of claim 2, wherein the outside shape of said sleeve (2-1) and said main proximal nail locking hole (1-2) are matching non-circular lemon shapes, locking said helical blade (2) in the main proximal nail locking hole (1-2).

4. The PFNA intramedullary nail of claim 3, wherein said tail nail (4) is screwed into the proximal tail of said main nail body (1-1), and the distal end of said tail nail (4) is in contact with said helical blade (2) to pressurize said helical blade (2).

5. The PFNA intramedullary nail of claim 4, wherein said main distal locking hole (1-3) comprises a circular locking hole and a long locking hole, said circular locking hole is selected when the patient is osteoporotic, and said main nail (1) is statically locked after said cross locking nail (3) is implanted in said circular locking hole; when the bone of a patient is hard, the long lock hole is selected, after the transverse lock nail (3) is implanted into the long lock hole, the main nail (1) is dynamically locked, and the main nail (1) can slightly move in the axis direction of the femur.