CN112603512A - PFNA short intramedullary nail - Google Patents
PFNA short intramedullary nail Download PDFInfo
- Publication number
- CN112603512A CN112603512A CN202011567093.8A CN202011567093A CN112603512A CN 112603512 A CN112603512 A CN 112603512A CN 202011567093 A CN202011567093 A CN 202011567093A CN 112603512 A CN112603512 A CN 112603512A
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- China
- Prior art keywords
- nail
- main
- tail
- pfna
- spiral blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- UZUFPBIDKMEQEQ-UHFFFAOYSA-N perfluorononanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F UZUFPBIDKMEQEQ-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 244000248349 Citrus limon Species 0.000 claims description 6
- 235000005979 Citrus limon Nutrition 0.000 claims description 6
- 210000000988 bone and bone Anatomy 0.000 abstract description 10
- 210000000689 upper leg Anatomy 0.000 abstract description 8
- 208000004550 Postoperative Pain Diseases 0.000 abstract description 4
- 230000001054 cortical effect Effects 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 230000003116 impacting effect Effects 0.000 abstract description 2
- 208000010392 Bone Fractures Diseases 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 208000008924 Femoral Fractures Diseases 0.000 description 2
- 210000002436 femur neck Anatomy 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000001694 thigh bone Anatomy 0.000 description 2
- 208000002193 Pain Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
- A61B17/725—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with locking pins or screws of special form
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/74—Devices for the head or neck or trochanter of the femur
- A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
- A61B17/744—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to an intramedullary nail
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
The invention provides a PFNA short intramedullary nail, which comprises a hollow main nail, a spiral blade, a locking nail and a tail nail, wherein the bolt blade, a transverse locking nail and the tail nail are detachably connected with the main nail, the near end and the far end of the main nail are provided with outward-extending bends with certain angles, and the far end of the main nail is provided with a certain front arch radian on a sagittal plane. Through increasing the design of the front arch radian of the distal end of the main nail on the sagittal plane, the main nail is more closely attached to the 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 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 the cortical bone or penetrating out the cortical bone to cause the fracture again.
Description
Technical Field
The invention relates to a medical instrument, in particular to a PFNA short intramedullary with an anterior 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 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 PFNA intramedullary nail of the current standard type is mainly nailed on the coronal plane, the far end and the near end are everted by 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 intramedullary nail is not provided with the front arc radian, after being implanted into the near end of the femur, the matching degree with the femoral medullary cavity is low, and the nail tip at the far end of the main nail easily impacts the femoral cortex, thereby causing postoperative pain of a patient and being not beneficial to the recovery of the patient. Because the main nail is not matched with the femoral medullary cavity, the far end of the main nail extrudes the femoral cortex to form stress concentration, and the risk that the post-operation main nail is broken or penetrates out of the femoral cortex is increased.
Therefore, a PFNA short intramedullary nail is urgently needed, the intramedullary nail is 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 main nail of the intramedullary nail does not have a front arch radian and the far end of the main nail impacts or extrudes the medullary cavity are solved.
Disclosure of Invention
The invention aims to provide a PFNA short intramedullary nail.
In order to solve the technical problems, the invention provides a PFNA short intramedullary nail which comprises a hollow main nail, a spiral blade, a locking nail and a tail nail, wherein the bolt blade, a transverse locking nail and the tail nail are detachably connected with the main nail, the near end and the far end of the main nail are outwards bent at a certain angle, the far end of the 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 main nail are respectively provided with a locking screw hole, and the bolt blade, the transverse locking nail and the tail nail are connected with the locking screw holes on the main nail in a matching manner.
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 circular middle part protrudes outwards;
further, the proximal and distal ends of the main nail have a 3 ° to 10 ° flared bend, preferably at an angle of 6 °.
The utility model provides an advantage lies in having increased the design of the front bow radian of main nail distal end on the sagittal plane, makes it and the inseparabler laminating of femoral medullary cavity, and 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's 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 illustration of a primary nail construction;
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 screw hole;
1-1, hollow main nails; 1-2 near end locking screw holes, 1-3 far end locking screw holes and 2 spiral blades; 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 made of a PFNA short intramedullary with an anterior arch radian according to the present invention with reference to the accompanying drawings and the detailed description thereof.
The utility model provides a take PFNA short type intramedullary of front bow radian, includes hollow main nail 1, spiral blade 2, horizontal lock nail and tail nail, just bolt blade 2, horizontal lock nail, tail nail can dismantle with the main nail and be connected, the near-end and the distal end of main nail have the abduction of certain angle to be crooked, and the 1 distal end of main nail has certain front bow radian on the sagittal plane, the near-end, distal end and the afterbody of main nail 1 are equipped with the locking screw hole respectively, wherein on bolt blade, horizontal lock nail, tail nail and the main nail the locking screw hole cooperation is connected. 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.
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 and distal ends of the main spike have a 3 ° to 10 ° flared bend, preferably at an angle of 6 °.
When in use:
(1) the main nail is like a medullary cavity, the nail body at the far end of the main nail has a certain front arch radian on the sagittal plane, the attaching degree with the medullary cavity is high, the resistance of the 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 is connected to the locking screw hole at the near end of the main nail in a penetrating mode 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 main nail far-end locking screw hole is interlocked through an auxiliary instrument, the transverse locking nail is implanted into the cortex of the far end of the femur and penetrates out of the cortex of the opposite side, the transverse locking nail penetrates through the main nail far-end locking screw hole and extends out of the locking screw hole, and at the moment, the far-end interlocking is completed.
(4) After the far-end interlocking is completed, the auxiliary instrument connected with the main nail is taken down, the tail nail is screwed into the locking screw hole in the end part of the main nail, the bone is prevented from growing into the locking screw hole in the end part of the main nail, and after the tail nail is installed, the far end of the tail nail is in contact with the spiral blade to pressurize the spiral blade, so that the stability of near-end interlocking is further improved.
The utility model provides an advantage lies in having increased the design of the front bow radian of main nail distal end on the sagittal plane, makes it and the inseparabler laminating of femoral medullary cavity, and 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's 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.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A PFNA short intramedullary nail is characterized by comprising a hollow main nail, a spiral blade, a locking nail and a tail nail, wherein the bolt blade, a transverse locking nail and the tail nail are detachably connected with the main nail, the near end and the far end of the main nail are provided with outward-extending bends with certain angles, the far end of the main nail is provided with a certain front arch radian on a sagittal plane, the near end, the far end and the tail of the main nail are respectively provided with locking screw holes, and the bolt blade, the transverse locking nail and the tail nail are connected with the locking screw holes on the main nail in a matched manner.
2. The PFNA short 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 PFNA short intramedullary nail of claim 1, 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 PFNA short intramedullary nail of claim 1, 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 PFNA short intramedullary nail of claim 1, wherein: wherein the shape of the near-end locking screw hole is non-circular lemon shape, and the circular middle part protrudes outwards.
6. The PFNA short intramedullary nail of claim 1, wherein: the proximal and distal ends of the main spike have a 3 ° to 10 ° flared bend, preferably at an angle of 6 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011567093.8A CN112603512A (en) | 2020-12-25 | 2020-12-25 | PFNA short intramedullary nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011567093.8A CN112603512A (en) | 2020-12-25 | 2020-12-25 | PFNA short intramedullary nail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112603512A true CN112603512A (en) | 2021-04-06 |
Family
ID=75249298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011567093.8A Pending CN112603512A (en) | 2020-12-25 | 2020-12-25 | PFNA short intramedullary nail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112603512A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202105011U (en) * | 2011-06-13 | 2012-01-11 | 张世民 | Short type femoral head intramedullary nail with anterior arch radian |
| CN209826929U (en) * | 2019-01-23 | 2019-12-24 | 大博医疗科技股份有限公司 | Proximal femoral compression intramedullary nail |
| CN111568523A (en) * | 2020-06-19 | 2020-08-25 | 河北春立航诺新材料科技有限公司 | PFNA intramedullary nail with small radian |
-
2020
- 2020-12-25 CN CN202011567093.8A patent/CN112603512A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202105011U (en) * | 2011-06-13 | 2012-01-11 | 张世民 | Short type femoral head intramedullary nail with anterior arch radian |
| CN209826929U (en) * | 2019-01-23 | 2019-12-24 | 大博医疗科技股份有限公司 | Proximal femoral compression intramedullary nail |
| CN111568523A (en) * | 2020-06-19 | 2020-08-25 | 河北春立航诺新材料科技有限公司 | PFNA intramedullary nail with small radian |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210406 |