CN214712743U

CN214712743U - Intramedullary nail with front arch radian

Info

Publication number: CN214712743U
Application number: CN202023184795.6U
Authority: CN
Inventors: 李正戎; 史春宝; 郭静; 王振国; 岳术同
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-11-16
Anticipated expiration: 2030-12-25

Abstract

The utility model provides an intramedullary nail of area front bow radian, including hollow main nail, spiral blade, locking nail and tail nail, just spiral blade, horizontal locking nail, tail nail can dismantle with hollow main nail and be connected, the near-end and the distal end of hollow main nail have the abduction of certain angle to be crooked, and the hollow main nail distal end has certain front bow radian on the sagittal plane. Through increasing the design of the front bow radian of the distal end of the hollow main nail on the sagittal plane, the hollow main nail is more closely attached to a femoral medullary cavity, the anatomical form of the femur is optimally matched in practical application, the operation convenience of the intramedullary nail is improved, the stress concentration caused by the 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 the cortical bone to cause the fracture again.

Description

Intramedullary nail with front arch radian

Technical Field

The utility model relates to a medical appliance, in particular to an intramedullary nail with a front arch radian.

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 hollow 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 hollow main nail end component tail nail. And the hollow main nail has a certain anatomical radian, and the intramedullary nail is more in line with the biomechanical characteristics of the femur for long tubular femoral fractures. The proximal end of the hollow main nail is provided with an inclined locking perforation, the distal end is provided with one or two transverse locking perforations, and in the operation of treating femoral fracture by intramedullary nail, after the hollow main nail is implanted into a femoral medullary cavity, the proximal end is locked by the spiral blade, and then the distal end is interlocked by the interlocking screw, so as to prevent the fracture end from moving up and down and twisting.

The PFNA intramedullary nail hollow main nail of the current standard type is arranged on the coronal plane, the far end and the near end of the PFNA intramedullary nail hollow main nail are everted at 6 degrees, the sagittal plane is linear, but the human femur has a certain everting angle on the coronal plane and a certain front arc radian on the sagittal plane, the far end of the PFNA intramedullary nail hollow main nail has no front arc radian, the matching degree with the femoral medullary cavity is low after the PFNA intramedullary nail hollow main nail is implanted into the near end of the femur, and the nail tip at the far end of the hollow main nail is easy to impact the femoral cortex, so that postoperative pain of a patient is caused, and the rehabilitation of the patient is not facilitated. Because the hollow main nail is not matched with the femoral medullary cavity, the far end of the hollow main nail extrudes the femoral cortex to form stress concentration, and the risk that the hollow main nail is broken or penetrates out of the femoral cortex after operation is increased.

Therefore, an intramedullary nail with an anterior arch radian is needed at present, so that the intramedullary nail can be better attached to a medullary cavity after being implanted into the medullary cavity of a femur, and the problems that the intramedullary nail is concentrated in stress after being implanted into the medullary cavity of the femur, penetrates out of a cortical bone, and the nail tip impacts the cortical bone to cause pain of a patient due to the fact that a hollow main nail of the intramedullary nail does not have the anterior arch radian and the medullary cavity is impacted or extruded by the far end of the hollow main nail are solved.

Novel content

The utility model aims to provide an intramedullary nail with an anterior arch radian.

In order to solve the technical problem, the utility model provides an intramedullary nail of area front bow radian, including hollow main nail, spiral blade, locking nail and tail nail, just spiral blade, horizontal locking nail, tail nail can dismantle with hollow main nail and be connected, the near-end and the distal end of hollow main nail have the abduction bending of certain angle, and hollow main nail distal end has certain front bow radian on the sagittal plane, the near-end, distal end and the afterbody of hollow main nail are equipped with the locking screw respectively, wherein spiral blade, horizontal locking nail, tail nail and hollow main nail last the locking screw cooperation is connected. The hollow main nail is small in front end and large in far end.

Further, the spiral blade comprises sleeve, threaded connection pole, tail cap and spiral blade head, and threaded connection pole one end dress inlays in spiral blade head one end, and threaded connection pole's external screw thread and the internal thread connection of tail cap connect in telescopic inboard, and there is the barb tail cap one end outside, barb on sleeve tip boss.

Wherein the outer side of the tail part of the spiral blade is provided with a step; the end part of the threaded connecting rod is provided with an annular groove matched with the step, so that the threaded connecting rod and the step are nested and matched.

The outer side of the sleeve is in a non-circular lemon shape, and the middle of the circle protrudes outwards;

further, the shape of the near-end locking screw hole is non-circular lemon shape, and the middle part of the circle protrudes outwards;

further, the proximal end and the distal end of the hollow main nail have a flared bend of 3-10 degrees, preferably an angle of 6 degrees.

The utility model provides an advantage lies in having increased the design of the front bow radian of hollow main nail distal end on the sagittal plane, make it with the inseparabler laminating of femoral medullary cavity, in practical application, the thighbone anatomical form has been matchd to the best, has improved the operation convenience of intramedullary nail, can avoid because the intramedullary nail does not match with femoral medullary cavity and the stress concentration that leads to, has reduced patient postoperative pain, effectively prevents that the nail point from striking the cortex bone or wearing out the cortex bone and leading to the fracture again.

Drawings

FIG. 1 is a schematic view of a hollow main nail structure;

FIG. 2 is a cross-sectional view of a helical blade;

FIG. 3 is a schematic view of the screw blade as a whole;

FIG. 4 is a schematic view of the sleeve construction;

FIG. 5 is a schematic view of a threaded connecting rod construction;

FIG. 6 is a schematic view of the tail cap construction;

FIG. 7 is a top view of the sleeve;

FIG. 8 is a schematic view of a proximal threaded bore;

1-1, hollow main nails; 1-2 near end locking screw holes and 1-3 far end locking screw holes; 2-1 sleeve, 2-2 threaded connecting rod, 2-3 tail cap; 2-4-helical blade head.

Detailed Description

In order to make the technical solution of the present invention better understood, the following detailed description is provided for the PFNA short intramedullary with anterior arch curvature with reference to the accompanying drawings and the specific embodiments.

The PFNA short intramedullary nail with the front arch radian comprises a hollow main nail 1-1, a spiral blade, a transverse locking nail and a tail nail, wherein the spiral blade, the transverse locking nail and the tail nail are detachably connected with the hollow main nail, the near end and the far end of the hollow main nail are outward bent at a certain angle, the far end of the hollow main nail 1-1 has a certain front arch radian on a sagittal plane, the near end, the far end and the tail part of the hollow main nail 1-1 are respectively provided with a locking screw hole, and the spiral blade, the transverse locking nail and the tail nail are connected with the locking screw holes on the hollow main nail in a matched mode. The spiral blade is composed of a sleeve 2-1, a threaded connecting rod 2-2, a tail cap 2-3 and a spiral blade head 2-4, one end of the threaded connecting rod 2-2 is embedded in one end of the spiral blade head 2-4, external threads of the threaded connecting rod 2-2 are connected with internal threads of the tail cap 2-3, the tail cap 2-3 is connected to the inner side of the sleeve 2-1, and a barb is arranged on the outer side of one end of the tail cap 2-3 and is arranged on a boss at the end of the sleeve. The hollow main nail is small in front end and large in far end.

Wherein, the outer side of the tail part of the spiral blade head 2-4 is provided with a step; the end part of the threaded connecting rod 2-2 is provided with an annular groove matched with the step, so that the threaded connecting rod and the step are nested and matched. Wherein the outer side of the sleeve 2-1 is in a non-circular lemon shape, and the middle part of the circle protrudes outwards; the near-end locking screw hole is in a non-circular lemon shape, and the middle part of the circle protrudes outwards; the proximal end and the distal end of the hollow main nail are provided with a 3-10 degrees flared bend, and the preferred angle is 6 degrees.

When in use:

(1) the hollow main nail is like a medullary cavity, the nail body at the far end of the hollow main nail has a certain front arch radian on the sagittal plane, the fit degree with the medullary cavity is high, the resistance of the hollow main nail during insertion can be reduced, and the nail tip is prevented from contacting and impacting the cortex of the femur or penetrating out of the cortex bone.

(2) Before the spiral blade is inserted, the spiral blade is unlocked, then the spiral blade is inserted into the femoral neck and the femoral head through the guide pin, the spiral blade penetrates through the locking screw hole at the near end of the hollow main nail and extends out of the locking screw hole, the spiral blade is locked after the spiral blade is inserted, and near end interlocking is completed.

(3) After the near-end interlocking is completed, the far-end locking screw hole of the hollow main nail is interlocked through an auxiliary instrument, the transverse locking nail is implanted into the far-end cortex of the femur and penetrates out of the contralateral cortex, the transverse locking nail penetrates through the far-end locking screw hole of the hollow main nail and extends out of the locking screw hole, and at the moment, the far-end interlocking is completed.

(4) After the distal end interlocking is completed, the auxiliary instrument connected with the hollow main nail is taken down, the tail nail is screwed into the locking screw hole in the end part of the hollow main nail, the bone is prevented from growing into the locking screw hole in the end part of the hollow main nail, and after the tail nail is installed, the distal end of the tail nail is in contact with the spiral blade, the spiral blade is pressurized, and the stability of the proximal end interlocking is further improved.

It is to be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention, and such changes and modifications are to be considered as within the scope of the invention.

Claims

1. The intramedullary nail with the front arch radian is characterized by comprising a hollow main nail, a spiral blade, a locking nail and a tail nail, wherein the spiral blade, a transverse locking nail and the tail nail are detachably connected with the hollow main nail, the near end and the far end of the hollow main nail are provided with outward-extending bends with certain angles, the far end of the hollow main nail is provided with a certain front arch radian on a sagittal plane, the near end, the far end and the tail part of the hollow main nail are respectively provided with locking screw holes, the spiral blade, the transverse locking nail and the tail nail are matched and connected with the locking screw holes on the hollow main nail, and the hollow main nail is small in front end and large in far end.

2. The intramedullary nail of claim 1, wherein: the spiral blade comprises sleeve, threaded connection pole, tail cap and spiral blade head, and threaded connection pole one end dress inlays in spiral blade head one end, and threaded connection pole's external screw thread and the internal thread connection of tail cap connect in telescopic inboard, and there is the barb tail cap one end outside, barb on sleeve tip boss.

3. The intramedullary nail of claim 2, wherein: wherein the outer side of the tail part of the spiral blade is provided with a step; the end part of the threaded connecting rod is provided with an annular groove matched with the step, so that the threaded connecting rod and the step are nested and matched.

4. The intramedullary nail of claim 2, wherein: wherein the outer side of the sleeve is in a non-circular lemon shape, and the middle part of the circle protrudes outwards.

5. The intramedullary nail of claim 1, wherein: the near end, the far end and the tail of the hollow main nail are respectively provided with a locking screw hole, wherein the locking screw hole at the near end is in a non-circular lemon shape, and the middle part of the circle protrudes outwards.

6. The intramedullary nail of claim 1, wherein: the proximal end and the distal end of the hollow main nail are provided with a 3-10 degree outward extending bend.

7. The intramedullary nail of claim 1, wherein: the proximal and distal ends of the hollow main nail have a 6 ° flared bend.