CN111759439A - Femoral medial condyle retrograde locking intramedullary needle - Google Patents
Femoral medial condyle retrograde locking intramedullary needle Download PDFInfo
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- CN111759439A CN111759439A CN202010719063.8A CN202010719063A CN111759439A CN 111759439 A CN111759439 A CN 111759439A CN 202010719063 A CN202010719063 A CN 202010719063A CN 111759439 A CN111759439 A CN 111759439A
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- 230000001054 cortical effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 210000000629 knee joint Anatomy 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000002980 postoperative effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 210000000689 upper leg Anatomy 0.000 description 12
- 206010017076 Fracture Diseases 0.000 description 11
- 208000010392 Bone Fractures Diseases 0.000 description 10
- 208000008924 Femoral Fractures Diseases 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 210000000281 joint capsule Anatomy 0.000 description 2
- 230000008407 joint function Effects 0.000 description 2
- 210000003041 ligament Anatomy 0.000 description 2
- 210000000426 patellar ligament Anatomy 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 208000006820 Arthralgia Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000001188 articular cartilage Anatomy 0.000 description 1
- 210000000845 cartilage Anatomy 0.000 description 1
- 210000004439 collateral ligament Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003275 diaphysis Anatomy 0.000 description 1
- 210000003195 fascia Anatomy 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 210000005067 joint tissue Anatomy 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 206010033675 panniculitis Diseases 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 210000004304 subcutaneous tissue Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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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 discloses a femoral medial condyle retrograde locking intramedullary needle, which comprises a needle tip and a needle rod, wherein the needle rod comprises a straight rod part and an arc-shaped part, the straight rod part is arranged at the top of the arc-shaped part, the needle tip is arranged at the top of the straight rod part, the top of the needle tip is provided with a 30-degree inclined part, the straight rod part is provided with a first screw and a second screw at the positions close to the needle tip, and the bottom of the arc-shaped part is provided with a third screw, a fourth screw and a fifth screw which are arranged at; the first screws and the second screws are arranged at intervals, and the included angle is 30-40 degrees; the third screw is arranged at the position close to the end part of the arc-shaped part, the third screw is positioned on the center line of the coronal plane, the included angles of the fourth screw, the fifth screw and the third screw are 20-30 degrees, and screw holes respectively matched with the first screw to the fifth screw are arranged on the needle rod. The invention can be used for treating femoral hypomere fracture, femoral unicondylar fracture or femoral intercondylar fracture, has simple operation during treatment, does not damage joints, has good fixing effect and good postoperative knee joint recovery, and can be widely applied to the field of medical appliances.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a femoral medial condyle retrograde locking intramedullary needle.
Background
The intramedullary pin fixation is an operation of inserting an intramedullary pin with proper size and length into the marrow cavities at both sides of the fracture end to fix the fracture. Intramedullary pins come in different types, such as "V" shaped, quincunx, triangular, etc.
The traditional retrograde intramedullary pin aiming at femoral fracture is mostly drilled from an intercondylar opening of a femur, and a patellar tendon and a joint capsule need to be longitudinally cut, and the retrograde intramedullary pin is drilled from an opening above a cruciate ligament insertion point before the intercondylar opening of the femur. The disadvantages are that: 1. the joint needs to be opened, so that the patellar tendon, the joint capsule adhesion and the like after the operation are easily caused, and the recovery of the knee joint function after the operation is influenced; 2. when joint tissues are damaged by the operation or the tail part of the intramedullary needle is too long and is exposed out of the articular cartilage, postoperative knee joint pain can be caused; 3. bone and cartilage fragments possibly generated in the operation are left in the knee joint cavity to form an episome, and cruciate ligaments can be damaged; 4. the second phase is difficult to remove the intramedullary nail.
Therefore, an intramedullary pin that can restore good joint function after operation without damaging joints is required for the intramedullary pin fixation.
Disclosure of Invention
The present invention is directed to overcoming the above problems and providing a femoral medial condyle retrograde locking intramedullary needle. In order to achieve the purpose, the invention adopts the following technical scheme:
the intramedullary nail comprises a needle point and a needle rod, wherein the needle rod comprises a straight rod part and an arc-shaped part, the straight rod part is arranged at the top of the arc-shaped part, the needle point is arranged at the top of the straight rod part, an inclined part of 30 degrees is arranged at the top of the needle point, a first screw and a second screw are arranged at the position, close to the needle point, of the straight rod part, and a third screw, a fourth screw and a fifth screw are arranged at the bottom of the arc-shaped part at intervals; the first screws and the second screws are arranged at intervals, and the included angle is 30-40 degrees; the third screw is arranged at the position close to the end part of the arc-shaped part, the third screw is positioned on the center line of the coronal plane, the included angle between the fourth screw, the fifth screw and the third screw is 20-30 degrees, and screw holes respectively matched with the first screw to the fifth screw are arranged on the needle rod.
As an improvement, fourth screw and fifth screw are nail structure in the nail, including overcoat screw and core screw, the overcoat screw includes first double-screw bolt and first nut, the core screw includes second double-screw bolt and second nut, first nut intermediate position is equipped with the cavity, and the top is equipped with the swivelling chute, the cavity lateral part is equipped with the through-hole, the core screw is worn to establish in the through-hole, be equipped with the internal thread in the through-hole, the second nut outside is equipped with the external thread, through-hole department is equipped with the internal thread, the second nut passes through-hole and overcoat screw spiro union to make overcoat screw and core screw locking.
As an improvement, the included angle between the outer sleeve screw and the core screw is 15 degrees.
As a refinement, the first to fifth screws are all cortical screws.
As a modification, the diameter of the needle rod is 8-12mm, the length of the needle rod is 180-380mm, and the curvature radius of the arc-shaped part is 120 mm.
As a refinement, the first screw and the second screw are spaced apart by 20 mm.
As a modification, the distances from the third screw, the fourth screw and the fifth screw to the tail end of the arc-shaped part are respectively 15mm, 25mm and 35 mm.
As an improvement, the end of the arc-shaped part is provided with a second screw hole convenient to mount, the intramedullary needle is further provided with a sixth screw for sealing the second screw hole, and the sixth screw is screwed into the second screw hole and then is pressed and locked with a third screw to form locking.
The invention has the advantages that:
1. the invention drills in from the external position of the femoral medial condyle joint, has simple operation, does not damage the joint and has good function recovery of the knee joint after operation.
2. A plurality of screws can be drilled into the needle rod position of the intramedullary nail, the distal 2 screws adopt a nail-in-nail locking design, and the most distal screw and a nut form a press-fit locking design, so that the mechanical stability is improved, the intramedullary nail can be used for fixing the diaphysis fracture of the far end of the femoral shaft and the distal unicondylar fracture of the femur, and the combined tension screw can be used for the intercondylar fracture of the femoral.
Drawings
FIG. 1 is a block diagram of a femoral intracondylar retrograde locking intramedullary pin of example 1;
FIG. 2 is a cross-sectional view of a femoral intracondylar retrograde locking intramedullary needle of example 1;
FIG. 3 is a view showing the structure of a nail of an intramedullary nail for locking the femoral condyle retrograde in example 1;
FIG. 4 is the angular relationship of the third to fifth screws of the femoral medial condyle retrograde locking intramedullary needle of example 1 in the femoral condyle;
FIG. 5 is a schematic view showing the use of the femoral medial condyle retrograde locking intramedullary needle of example 1;
FIG. 6 is a view showing the use of the femoral medial condyle retrograde locking intramedullary needle of example 1 viewed from the medial aspect of the femur;
FIG. 7 is a schematic view of the medial femoral condyle retrograde locking intramedullary needle of example 1 for treating lower femoral fractures;
FIG. 8 is a schematic view of an intracondylar retrograde locking intramedullary needle of example 1 for treating a unicondylar fracture of a femur;
FIG. 9 is a schematic view of an intracondylar retrograde locking intramedullary needle of example 1 for treating an intercondylar fracture of a femur.
The figures are labeled as follows:
1-needle point, 11-inclined part, 2-needle bar, 21-straight bar part, 22-arc part, 221-second screw hole, 3-first screw, 4-second screw, 5-third screw, 6-fourth screw, 61-outer sleeve screw, 611-first stud, 612-first nut, 613-cavity, 614-rotating groove, 615-through hole, 62-core screw, 621-second stud, 622-second nut, 7-fifth screw, 8-screw hole, 9-sixth screw.
Detailed Description
The present invention will be described in detail and specifically with reference to the following examples so as to facilitate the understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The embodiment discloses a femoral medial condyle retrograde locking intramedullary nail, which comprises a needle tip 1 and a needle rod 2, wherein the needle rod 2 comprises a straight rod part 21 and an arc-shaped part 22, the straight rod part 21 is arranged at the top of the arc-shaped part 22, the needle tip 1 is arranged at the top of the straight rod part 21, and the top of the needle tip 1 is provided with a 30-degree inclined part 11.
A first screw 3 and a second screw 4 are arranged at the position of the straight rod part 21 close to the needle point 1, and a third screw 5, a fourth screw 6 and a fifth screw 7 which are arranged at intervals are arranged at the bottom of the arc part 22; the first screw 3 and the second screw 4 are spaced by 20mm, and the included angle is 30 degrees; the third screw 5 is provided near the end of the arc-shaped portion 22. As shown in fig. 4, the third screw 5 is located on the middle line of the coronal plane, the included angles between the fourth screw 6, the fifth screw 7 and the third screw are respectively 25 degrees and 20 degrees, and the needle bar 2 is provided with screw holes 8 respectively matched with the first screw 3 to the fifth screw 7.
The fourth screw 6 and the fifth screw 7 are of a nail-in-nail structure and comprise an outer sleeve screw 61 and a core screw 62, the outer sleeve screw 61 comprises a first stud 611 and a first nut 612, the core screw 62 comprises a second stud 621 and a second nut 622, a cavity 613 is arranged in the middle of the first nut 612, a rotating groove 614 is arranged at the top of the first nut 612, a through hole 615 is formed in the side of the cavity 613, the core screw 62 penetrates through the through hole 615, female threads are arranged in the through hole 615, male threads are arranged on the outer side of the second nut 622, and the second nut 622 is in threaded connection with the outer sleeve screw 61 through the through hole 615 and enables the outer sleeve screw 61 and the core screw 62 to be locked. The angle between the outer sleeve screw 61 and the core screw 62 is 15 °.
The end part of the arc-shaped part 22 is provided with a second screw hole 221 convenient for installation, the intramedullary pin is also provided with a sixth screw 9 for sealing the second screw hole 221, and after the sixth screw 9 is screwed in, the third screw 5 is pressed and locked to form locking.
In the present embodiment, the first screw 3 to the fifth screw 7 are cortical screws. The needle bar 2 has a diameter of 9mm and a length of 180mm, and the radius of curvature of the arc-shaped portion 22 is 120 mm. The distances from the third screw, the fourth screw and the fifth screw to the tail end of the arc-shaped part are respectively 15mm, 25mm and 35 mm.
When the embodiment is used for femoral fracture treatment, a longitudinal incision with the length of about 2cm is made at the medial condyle of the femur, skin, subcutaneous tissue and deep fascia are incised, the lateral position is 1cm in front of the highest point of the medial condyle of the femur (the central point of the medial collateral ligament insertion point of the knee), and a kirschner pin is drilled along the lateral anatomical longitudinal axis direction of the femur; the orthodox kirschner wire is parallel to the cortical bone of the medial condyle of the femur, and has an included angle of 40 degrees with the orthodox anatomical longitudinal axis of the femur, and the insertion point is about 0.2cm higher than the lowest point of the intercondylar of the femur. After the C-arm X-ray machine confirms that the position is correct, the guider is inserted along the Kirschner wire to drill and expand the marrow, and then the intramedullary needle is inserted and fixed.
As shown in FIGS. 7-9, this embodiment may be applied to a lower femoral fracture (site A), a unicondylar femoral fracture (site B), or an intercondylar femoral fracture (site C). When the external and internal intercondylar fracture treatment device is applied to the intercondylar fracture of the femoral bone, the internal and external intercondylar fractures are connected into a whole by using a lag screw, and the femoral shaft fracture is treated by using the embodiment.
The invention drills in from the external joint part of the femoral medial condyle, has simple operation, does not damage the joint and has good function recovery of the knee joint after operation; a plurality of screws can be drilled into a needle rod of the intramedullary nail, the fourth screw 6 and the fifth screw 7 adopt a nail-in-nail locking structure, and the sixth screw 9 can be screwed in and then press-fitted to lock the third screw 5 to form locking, so that the mechanical stability is improved.
The embodiments of the present invention have been described in detail above, but they are merely exemplary, and the present invention is not equivalent to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, it is intended that all equivalent alterations and modifications be included within the scope of the invention, without departing from the spirit and scope of the invention.
Claims (8)
1. The intramedullary nail is characterized in that the needle bar comprises a straight rod part and an arc-shaped part, the straight rod part is arranged at the top of the arc-shaped part, the needle point is arranged at the top of the straight rod part, the top of the needle point is provided with a 30-degree inclined part, the straight rod part is provided with a first screw and a second screw at positions close to the needle point, and the bottom of the arc-shaped part is provided with a third screw, a fourth screw and a fifth screw which are arranged at intervals; the first screws and the second screws are arranged at intervals, and the included angle is 30-40 degrees; the third screw is arranged at the position close to the end part of the arc-shaped part, the third screw is positioned on the center line of the coronal plane, the included angle between the fourth screw, the fifth screw and the third screw is 20-30 degrees, and screw holes respectively matched with the first screw to the fifth screw are arranged on the needle rod.
2. The intramedullary pin of claim 1, wherein the fourth and fifth screws are of a nail-in-nail structure and comprise outer sleeve screws and core screws, the outer sleeve screws comprise first studs and first nuts, the core screws comprise second studs and second nuts, the first nuts are provided with cavities at middle positions, rotating grooves are formed in the tops of the cavities, through holes are formed in the side portions of the cavities, the core screws are arranged in the through holes in a penetrating mode, female threads are arranged in the through holes, male threads are arranged on the outer sides of the second nuts, and the second nuts are in threaded connection with the outer sleeve screws through the through holes and enable the outer sleeve screws and the core screws to be locked.
3. The femoral condyle retrograde locking intramedullary pin of claim 2, wherein the angle between the outer sleeve screw and the core screw is 15 degrees.
4. The femoral condyle retrograde locking intramedullary needle of claim 1, wherein the first to fifth screws are cortical screws.
5. The femoral condyle retrograde locking intramedullary needle of claim 1, wherein the diameter of the needle shaft is 8-12mm, the length is 180-380mm, and the radius of curvature of the arc portion is 120 mm.
6. The femoral condyle retrograde locking intramedullary needle of claim 5, wherein the first screw and the second screw are spaced 20mm apart.
7. The femoral condyle retrograde locking intramedullary needle of claim 5, wherein the distances from the arc-shaped part end of the third screw, the fourth screw and the fifth screw are respectively 15mm, 25mm and 35 mm.
8. The intramedullary pin of claim 1, wherein the end of the curved portion has a second threaded hole for easy installation, and a sixth screw closing the second threaded hole is provided, and the sixth screw is screwed into the second threaded hole and press-fitted to lock the third screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010719063.8A CN111759439A (en) | 2020-07-23 | 2020-07-23 | Femoral medial condyle retrograde locking intramedullary needle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010719063.8A CN111759439A (en) | 2020-07-23 | 2020-07-23 | Femoral medial condyle retrograde locking intramedullary needle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111759439A true CN111759439A (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010719063.8A Pending CN111759439A (en) | 2020-07-23 | 2020-07-23 | Femoral medial condyle retrograde locking intramedullary needle |
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| CN (1) | CN111759439A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113229915A (en) * | 2021-04-21 | 2021-08-10 | 天津市金兴达实业有限公司 | Intramedullary pin |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2537357Y (en) * | 2002-04-30 | 2003-02-26 | 杨卫兵 | Femur middle and far section retrograde intramedullary nail |
| CN2808073Y (en) * | 2005-05-11 | 2006-08-23 | 宋文生 | Converse intramedullary nail for femoral bone |
| CN101090676A (en) * | 2004-12-31 | 2007-12-19 | 斯恩蒂斯有限公司 | Intramedullary nail |
| CN102715945A (en) * | 2012-06-08 | 2012-10-10 | 浙江科惠医疗器械有限公司 | Corner locking hollow screw for fracture treatment |
| CN107961067A (en) * | 2018-01-12 | 2018-04-27 | 四川大学华西医院 | Outer inlet Shin-bone internal broach |
| CN108420518A (en) * | 2018-03-23 | 2018-08-21 | 山东航维骨科医疗器械股份有限公司 | Intramedullary nail on a kind of condyle |
| CN209996456U (en) * | 2019-05-05 | 2020-01-31 | 宝鸡晨发钛业有限公司 | stably-mounted femoral reconstruction intramedullary nail |
| CN212281586U (en) * | 2020-07-23 | 2021-01-05 | 宁德市闽东医院 | Femoral medial condyle retrograde locking intramedullary needle |
-
2020
- 2020-07-23 CN CN202010719063.8A patent/CN111759439A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2537357Y (en) * | 2002-04-30 | 2003-02-26 | 杨卫兵 | Femur middle and far section retrograde intramedullary nail |
| CN101090676A (en) * | 2004-12-31 | 2007-12-19 | 斯恩蒂斯有限公司 | Intramedullary nail |
| CN2808073Y (en) * | 2005-05-11 | 2006-08-23 | 宋文生 | Converse intramedullary nail for femoral bone |
| CN102715945A (en) * | 2012-06-08 | 2012-10-10 | 浙江科惠医疗器械有限公司 | Corner locking hollow screw for fracture treatment |
| CN107961067A (en) * | 2018-01-12 | 2018-04-27 | 四川大学华西医院 | Outer inlet Shin-bone internal broach |
| CN108420518A (en) * | 2018-03-23 | 2018-08-21 | 山东航维骨科医疗器械股份有限公司 | Intramedullary nail on a kind of condyle |
| CN209996456U (en) * | 2019-05-05 | 2020-01-31 | 宝鸡晨发钛业有限公司 | stably-mounted femoral reconstruction intramedullary nail |
| CN212281586U (en) * | 2020-07-23 | 2021-01-05 | 宁德市闽东医院 | Femoral medial condyle retrograde locking intramedullary needle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113229915A (en) * | 2021-04-21 | 2021-08-10 | 天津市金兴达实业有限公司 | Intramedullary pin |
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