CN113197631B - Interlocking intramedullary nail applicable to metaphysis fracture bone defect - Google Patents
Interlocking intramedullary nail applicable to metaphysis fracture bone defect Download PDFInfo
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- 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
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Abstract
The invention relates to an interlocking intramedullary nail applicable to metaphyseal fractured bone defects, which belongs to the field of medical instruments and comprises a main nail and a locking screw, wherein the main nail comprises a distal end, a proximal end and an expansion part, wherein the distal end and the expansion part are arranged at two ends of the proximal end; a plurality of thread grooves are formed in the two sides of the far end and the near end; the locking screw is a full thread screw and is screwed in the thread groove. The main nail is of a solid structure, has stronger mechanical strength than that of a common hollow intramedullary nail and is not easy to break, thereby providing reliable stability for fracture defect at the metaphysis position, eliminating abnormal movement of the fracture and being beneficial to fracture healing.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to an interlocking intramedullary nail applicable to metaphyseal fracture bone defects.
Background
Severe fracture of long bones of limbs is often accompanied by bone defects, which can also occur after resection of bone tumors and skeletal deformities. Therefore, clinical fractures and bone defects are common, for which intramedullary nails and plate screws are the most effective intra-operative fixation methods. However, the steel plate is positioned on one side of the skeleton and is eccentrically fixed, and the steel plate is easily bent and broken after being longitudinally stressed, while the intramedullary nail is positioned in the center of the skeleton and is centrally fixed, so that the intramedullary nail is not easily bent and broken after being longitudinally stressed. Therefore, the intramedullary nail has better mechanical effect than a steel plate, and becomes a preferred internal fixation method for long bone fracture and bone defect. However, the best indications for intramedullary nails are fractures and bone defects in the diaphyseal region (central section) of long bones, and for fractures and bone defects in the metaphyseal region (both ends), the intramedullary nail cannot be in close contact with the cortical bone wall on the larger side of the medullary cavity due to the larger medullary cavity on the metaphyseal side, and only the connection of the locking screw with the main nail provides the origin of force and stability, whereas when the intramedullary nail is used for fixation of metaphyseal fractures and bone defects, the fracture on one side is often shorter, and only 1-2 locking screw holes can be implanted with screws. However, the main nail and the locking screw of the prior interlocking intramedullary nail are not in locking connection, but the screw hole is larger than the locking screw, and the connection between the main nail and the locking screw has toggle movement, so that the stability provided by the fixation by the 1-2 locking screw is poor, the reliable fixation effect cannot be achieved, the abnormal movement and displacement of the broken end, especially the instability of the horizontal plane and the shearing micromotion are not beneficial to the healing of the fracture, the bone nonunion and the delayed healing are easily caused, and the incidence rate of the bone nonunion after the fixation of the metaphysis of the prior common intramedullary nail is very high (more than 30 percent) which is regarded as contraindication. Secondly, the locking screw holes of the currently used intramedullary nails are positioned in the centers of the nail bodies at the two ends of the intramedullary nail, and account for 1/2 or more of the cross section of the intramedullary nail, so that firstly, the strength of the locking screw holes of the intramedullary nail is obviously reduced, and the locking screw holes of the intramedullary nail are frequently broken clinically. Meanwhile, the used locking screw cannot be thick and cannot be larger than the diameter of the intramedullary nail (the general diameter is about 4 mm), and if only 1-2 locking screws can be implanted, the locking screws are stressed more, more and more intensively, and the locking screws are easy to break. The intramedullary nail is poor in fixation stability aiming at metaphyseal fracture bone defect clinically, and the adopted contralateral side is as follows: (1) the use of multiple locking screws increases the stability of the locking fixation on the metaphysis side, but the range of implantable screws on the metaphysis side is often limited, thus limiting the use of this approach; (2) in the medullary cavity, the blocking nail is used outside the main nail of the intramedullary nail to increase the fixing stability of one side of the metaphysis, but the blocking nail and the main nail are not connected by screw thread, and the main nail and the blocking nail can still slide horizontally, namely, the blocking fixing is not reliable; (3) on the basis of the intramedullary nail, one steel plate is assisted for internal fixation, so that the reliable fixation effect can be achieved, but the two internal fixation methods are combined, so that the cost and the operation wound are increased. Thus, the above methods of increasing the stability of both metaphyseal fractures and bone defects using intramedullary nails have drawbacks.
The majority of the intramedullary nails used at present are hollow intramedullary nails, which have the advantages that the intramedullary nails can be guided to be inserted into the medullary cavity by using guide pins with smaller diameters, but have the disadvantages that the compression strength and the bending strength of the hollow intramedullary nails are smaller than those of the solid intramedullary nails. The locking screw holes of currently used intramedullary nails are almost (99%) unthreaded and only application publication numbers: CN108433798A, application No.: 2018103354383, the intramedullary nail has a locking screw hole with screw thread, but the locking screw hole is positioned on the nail body of the main nail, the intramedullary nail at the locking screw hole has weak strength and is easy to break, and the number of the locking screws used in the metaphyseal fracture bone defect is limited. The length of the currently used intramedullary nails is fixed, the intramedullary nails with different lengths are usually spaced by 1cm, the condition that the intramedullary nails with the length not right are not used in the operation sometimes occurs, if the intramedullary nails are inserted too long, the main nail is too short, the proximal end of the main nail is buried in the medullary cavity, the proximal end of the main nail is embedded by callus when the intramedullary nail is taken out after fracture healing, the callus at the tail part of the main nail or grown into the tail part cannot be found to influence the insertion connection of a connector, and if the main nail is too long, the tail part of the main nail protrudes out of the subcutaneous part of the opening of the skeleton, which influences the movement of the affected limb or causes pain, limited movement or other discomfort.
Disclosure of Invention
The invention aims to overcome the defects of the prior common intramedullary nail, and provides the interlocking intramedullary nail with reliable and stable fixing effect for the fracture and bone defect at the metaphysis, even if one side of the fracture end has only the range of 1 threaded hole, at least 2 locking screws can be implanted, so that the number of the implanted locking screws can reach 2 times of that of the common intramedullary nail, the locking screws with thicker diameters (which can be close to or exceed the diameter of the main nail) can be used, the length of the main nail can be flexibly adjusted, the requirements of different lengths can be met, the tail part of the main nail can be ensured to be exactly positioned at the opening part of the bone, and the later-stage taking-out is convenient.
According to the technical scheme provided by the invention, the interlocking intramedullary nail applicable to the defect of the metaphyseal fractured bone comprises a main nail and a locking screw, and is characterized in that the main nail comprises a far end, a near end and an expansion part, wherein the far end and the expansion part are arranged at two ends of the near end; a plurality of thread grooves are respectively formed in the two sides of the far end and the near end of the main nail; the locking screw is screwed in the thread groove.
As a further improvement of the invention, the expansion part is connected with the tail end of the near end through threads, wherein the tail end of the near end is provided with external threads, one end of the expansion part is provided with internal threads, and the external threads are screwed with the internal threads.
As a further improvement of the invention, the other end of the expansion part is provided with a convex column, the convex column is provided with an external thread of the expansion part, and the diameter of the expansion part is the same as that of the main nail.
As a further improvement of the invention, the width of the thread groove is 30-50% of the diameter of the locking screw, and the curvature radius of the thread groove is 1-6 mm.
As a further improvement of the invention, the vertical distance between the thread grooves is 0-8mm, and the thread grooves are divided into compact thread grooves and sparse thread grooves.
As a further improvement of the invention, the compact thread grooves are arranged on two sides of the main nail, and two adjacent compact thread grooves are symmetrically arranged on the same horizontal plane.
As a further improvement of the invention, the sparse type thread grooves are arranged on two sides of the main nail, and the two sparse type thread grooves are not arranged on the same horizontal plane and are arranged at intervals of 1-8 mm.
As a further improvement of the invention, the number of the thread grooves is not less than six.
As a further improvement of the invention, the main nail is of a solid cylinder structure, the main nail is made of titanium alloy material, the diameter of the main nail is 5-18mm, and the length of the main nail is 10-50 cm.
As a further improvement of the invention, the locking screw is a full-thread self-tapping screw with a diameter of 2-12mm and a length of 2-7 cm.
The invention has the beneficial effects that: the interlocking intramedullary nail is used for fixing fracture and bone defect at the far end or near end metaphysis part of the long bone, even if one side of the bone has less distance (even 1 threaded hole distance), a plurality of (at least 2) locking screws with thicker diameters can be implanted into the threaded groove at the periphery of the main nail, and the locking screws and the main nail are extruded and locked and fixed, thereby providing reliable stability for unstable metaphysis, eliminating abnormal activity of fracture and being beneficial to fracture healing; the main nail is solid, the mechanical strength is stronger than that of a common hollow intramedullary nail, and the main nail is not easy to break; the main nail has no obvious influence on the strength of the main nail due to the locking screw hole, and has better mechanical strength than the locking hole of the common intramedullary nail, and the locking hole of the main nail is not easy to break; the used locking screw is thick in diameter and high in strength, and the locking screw is not easy to break; the extension portion of main nail is the unequal section of length of threaded, can satisfy the needs of different length, can insert the main nail afterbody behind the farthest end and just can be located skeleton trompil department when guaranteeing long bone distal end fracture and bone defect to use this intramedullary nail, makes things convenient for the later stage to take out.
Drawings
Fig. 1 is a schematic view of the main nail structure of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Fig. 3 is a schematic structural view of the expansion portion.
FIG. 4 is a front view of a mounting structure with a tight thread groove.
FIG. 5 is a side view of a mounting structure with a tight thread groove.
Fig. 6 is a front view of the installation structure with the evacuation type screw groove.
Fig. 7 is a side view of the installation structure with the evacuation type screw groove.
FIG. 8 is a schematic view of the fracture site as the thread groove position is inserted distally on the main nail.
FIG. 9 is a schematic view of the fracture site being the location of the thread groove when inserted proximally on the main nail.
Description of reference numerals: description of reference numerals: 1. a main nail; 2. a locking screw; 3. a bone; 4. a fracture site; 1-1, distal end; 1-2, a proximal end; 1-3, an extension; 1-4, thread groove; 1-2-1, external threads; 1-3-1, internal thread; 1-3-2, external threads of the expansion part; 1-3-3, convex column.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
As shown in the figure, the interlocking intramedullary nail applicable to the defect of the metaphyseal fractured bone comprises a main nail 1 and a locking screw 2, wherein the main nail 1 comprises a far end 1-1, a near end 1-2 and an expansion part 1-3, wherein the far end 1-1 and the expansion part 1-3 are arranged at two ends of the near end 1-2; a plurality of thread grooves 1-4 are arranged on two sides of the far end 1-1 and the near end 1-2 of the main nail 1; the locking screw 2 is a full thread screw, and the locking screw 2 is screwed in the thread grooves 1-4.
The expansion part 1-3 is connected with the tail end of the near end 1-2 through threads, wherein the tail end of the near end 1-2 is provided with an external thread 1-2-1, one end of the expansion part 1-3 is provided with an internal thread 1-3-1, the external thread 1-2-1 is screwed with the internal thread 1-3-1, and the expansion part 1-3 can be adjusted to move up and down through screwing of the internal thread and the external thread so as to meet the requirement of expansion of the whole length of the main nail 1, adjust and adapt to be fixed in the intramedullary position and adapt to various bone fracture conditions.
The other end of the expansion part 1-3 is provided with a convex column 1-3-3, an expansion part external thread 1-3-2 is arranged on the convex column 1-3-3, the diameter of the expansion part 1-3 is the same as that of the main nail 1, and the expansion part external thread 1-3-2 can be inserted into an intramedullary nail and taken out of the intramedullary nail after being connected with the inner nut end of the aiming implanter.
The maximum width of the thread groove 1-4 is 30% -50% of the diameter of the locking screw 2, and the curvature radius of the thread groove 1-4 is 1-6 mm.
The thread grooves 1-4 are arranged at the far sides near the far ends 1-1 and the near ends 1-2 of the main nail, so that when the fracture 4 is near the two ends of the tibia, the thread grooves 1-4 can be implanted with more locking screws 2 as possible, as shown in fig. 8.
The vertical distance between the thread grooves 1-4 is 0-8mm, and the thread grooves 1-4 are divided into compact thread grooves and sparse thread grooves according to whether the position arrangement is symmetrical or not; the compact thread grooves are arranged at two sides of the main nail 1, two adjacent compact thread grooves are symmetrically arranged at the same horizontal plane and are provided with a plurality of groups, as shown in figures 4-5, when the fracture line is close to the tail end of one side and the length of one end of the fracture is less, the main nail of the compact thread groove is selected; the evacuation type thread grooves are arranged on two sides of the main nail 1, the two evacuation type thread grooves are not arranged on the same horizontal plane and are arranged at intervals of 1-8mm, as shown in figures 6-7, the staggered thread grooves 1-4 can adapt to the condition that the fracture line is close to the center and the length of one end of the fracture is longer, and then the main nail 1 with the evacuation type thread groove structure is selected; the number of the thread grooves 1-4 on the main nail 1 is not less than six, wherein one thread groove 1-4 at the tail end is positioned at the tail end of the near end or the far end of the main nail, and the purpose that the fracture part 4 is provided with the locking screws 2 up and down is met.
The main nail 1 is of a solid cylinder structure and made of titanium alloy materials, the overall diameter of the main nail 1 is 5-18mm, the length of the main nail is 10-50cm, and the size of a medullary cavity of most broken bones is met.
The locking screw 2 is a full-thread self-tapping screw, the diameter of the locking screw is 2-12mm, the length of the locking screw is 2-7cm, and due to the screwing and clamping of the threads in the thread grooves 1-4 and the locking screw 2, the main screw 1 and the locking screw 2 are tightly connected under the extrusion in a bone marrow cavity, and the medical requirements are met.
Example 1:
for the fracture or bone defect at the far end of the inserted main nail, the fracture end is reduced and then is connected with the external thread 1-2-1 at the near end 1-2 by using the nut end of the sighting device under the perspective, then the main nail 1 is inserted into the medullary cavity, and the far end of the main nail 1 needs to be inserted into the farthest end of the medullary cavity as far as possible, so-called root pricking. Withdrawing the main nail 1, testing the required optimal length according to the primarily inserted main nail 1, selecting the main nail 1 with proper length and diameter, and if no main nail 1 with proper length exists, selecting the expansion part 1-3 to adjust the length of the main nail 1, so that the tail end of the expansion part 1-3 of the nail body of the main nail 1 is just positioned at the opening of the needle inserting point. Meanwhile, the main nail 1 with matched compact or sparse thread grooves 1-4 is selected according to the using position and the length of the far-side fracture end, and the specific selection method comprises the following steps: if the length of the far fracture end is less and only 1-3 threaded holes are long, the main nail 1 with the compact thread groove 1-4 is selected; if the far-end fracture end is longer and has 4 threaded holes, the main nail 1 of the sparse thread groove 1-4 is selected (4 locking screws are implanted into one end of the main nail for the best, and if the length of the far-end fracture end is less than the length of the threaded holes, at least 2 locking screws are implanted into one end of the main nail). For tibia, femur and humerus, the thread grooves 1-4 are generally arranged with the front and back sides of the main nail 1, and the thread grooves 1-4 for ulna and radius are generally arranged with the inner and outer sides of the main nail 1; the diameter of the main nail of the tibia and the femur is 9-10mm generally, the curvature radius of the thread groove is 3mm, and the diameter of the locking screw 2 is 6 mm. The intramedullary nail of the selected thread groove 1-4 is then inserted into the medullary cavity and to the distal-most end of the medullary cavity using the aimer. Respectively drilling holes in the thread grooves 1-4 at the farthest side of the far ends 1-1 of the main intramedullary nail main nails by using the sighting device and the sleeve under fluoroscopy, then measuring the length of the locking holes, selecting the locking screws 2 with proper length and diameter of 6mm, and respectively screwing in the two parallel locking screws 2 by using a screwdriver for fixation. If the fracture end is separated, the sighting device can be used for knocking the main nail of the intramedullary nail to the near end so as to lead the fracture far end to be close to the fracture near end. Then, the proximal locking screw is implanted with 4 fixation screws using the aiming device in the same manner as the distal locking screw. The example 8 shows that the length of the distal fracture end of the tibia is small and is only 1 threaded hole, so that the main nail 1 with the thread grooves 1-4 which are compact and are uniformly distributed on the front side and the rear side of the main nail in parallel is selected. A sighting device and a sleeve are utilized to respectively drill 2 compact thread grooves 1-4 on the front side and the rear side of the farthest side of the far end 1-1 of the main intramedullary nail under fluoroscopy, then the length of a locking hole is measured, and 2 locking screws 2 with proper length and diameter of 6mm are selected to be fixedly connected with the main nail 1 in an extrusion locking manner. Then, the proximal locking screw is implanted with 4 fixation screws using the aiming device in the same manner as the distal locking screw.
Example 2:
for the fracture or bone defect at the near end inserted into the intramedullary nail, the fracture end is connected with the external thread 1-2-1 at the tail side of the near end 1-2 in the intramedullary nail by using the nut of the sighting device under the perspective after the reduction, the main nail 1 is inserted into the medullary cavity without the expansion part 1-3, the position of the main nail 1 is adjusted, and the tail side of the main nail 1 is just positioned at the opening of the needle inserting point position. The intramedullary nail is selected with a suitable length and diameter according to the situation after the initial insertion of the intramedullary nail. For tibia and femur, generally the thread grooves 1-4 are arranged with the front and back sides of the main nail 1, usually the thread groove curvature radius is 3mm, the locking screw diameter is 6mm, and the tibia intramedullary nail diameter is 9 mm. Meanwhile, the main nails 1 with the number of the matched thread grooves 1-4 are selected according to the length of the proximal fracture, and the method specifically comprises the following steps: if the length of the proximal fracture is short, the main nail 1 with the compact thread groove 1-4 is selected, and if the length of the proximal fracture is long, the main nail 1 with the sparse thread groove 1-4 is selected. The proximal fracture of the tibial bone is shown in the figure 9, the length of the proximal fracture is small, and only one threaded hole is long, so that the main nail 1 with the compact threaded groove 1-4 is selected, and the threaded groove 1-4 is positioned on the front side and the rear side of the main nail 1. Then, the screw main nail is inserted into the marrow cavity of the tibia by using the sighting device, and the position of the main nail is adjusted to enable the tail side of the main nail to be just positioned at the opening of the needle-inserting point position without being inserted into the most far end of the marrow cavity. The front side and the rear side of the thread groove 1-4 of the most proximal end 1-2 are respectively drilled under perspective by using the sighting device and the sleeve, the length of the locking hole is measured, the interlocking nail 2 with proper length and diameter of 6mm is selected, and the locking nail is respectively screwed into 2 locking screws for fixation by using a screwdriver. If the fracture end is separated, the sighting device can be used for knocking the main nail of the intramedullary nail to the far end so as to lead the fracture far end to be close to the fracture near end. Then, in the same manner as the locking screw 2 implanted in the proximal end 1-2, 4 locking screws are implanted in the distal end for fixation using an aiming device.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and changes can be made without departing from the novel technical principle of the present invention, and these modifications and changes should also be considered as the novel protection scope of the present invention.
Claims (2)
1. Interlocking intramedullary nail applicable to a metaphyseal fractured bone defect, comprising a main nail (1) and a locking screw (2), characterized in that said main nail (1) comprises a distal end (1-1), a proximal end (1-2) and an expansion part (1-3), wherein the distal end (1-1) and the expansion part (1-3) are arranged at both ends of the proximal end (1-2); a plurality of thread grooves (1-4) are respectively arranged on the two sides of the far end (1-1) and the near end (1-2) of the main nail (1); the locking screw (2) is screwed in the thread groove (1-4);
the expansion part (1-3) is connected with the tail end of the near end (1-2) through threads, wherein the tail end of the near end (1-2) is provided with external threads (1-2-1), one end of the expansion part (1-3) is provided with internal threads (1-3-1), and the external threads (1-2-1) are connected with the internal threads (1-3-1) in a screwing mode;
the other end of the expansion part (1-3) is provided with a convex column (1-3-3), the convex column (1-3-3) is provided with an external thread (1-3-2) of the expansion part, and the diameter of the expansion part (1-3) is the same as that of the main nail (1);
the width of the thread groove (1-4) is 30% -50% of the diameter of the locking screw (2), and the curvature radius of the thread groove (1-4) is 1-6 mm;
the vertical distance between the thread grooves (1-4) is 0-8mm, and the thread grooves (1-4) are divided into compact thread grooves and sparse thread grooves;
the evacuation type thread grooves are formed in two sides of the main nail (1), and the two evacuation type thread grooves are not located on the same horizontal plane and are arranged at intervals of 1-8 mm;
the compact thread grooves are formed in two sides of the main nail (1), and two adjacent compact thread grooves are symmetrically arranged in the same horizontal plane;
the main nail (1) is of a solid cylinder structure and is made of a titanium alloy material, and the diameter of the main nail (1) is 5-18mm, and the length of the main nail (1) is 10-60 cm;
the locking screw (2) is a full-thread self-tapping screw, the diameter of the locking screw is 2-12mm, and the length of the locking screw is 2-7 cm.
2. An interlocking intramedullary nail applicable to a metaphyseal fractured bone defect according to claim 1, characterized in that the number of said threaded grooves (1-4) is not less than six.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110399201.3A CN113197631B (en) | 2021-04-14 | 2021-04-14 | Interlocking intramedullary nail applicable to metaphysis fracture bone defect |
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| CN202110399201.3A CN113197631B (en) | 2021-04-14 | 2021-04-14 | Interlocking intramedullary nail applicable to metaphysis fracture bone defect |
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| CN113197631B true CN113197631B (en) | 2022-07-12 |
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| CN114711942B (en) * | 2022-04-29 | 2023-03-21 | 中山大学附属第三医院 | Intramedullary nail with blocking bolt and aiming system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204121149U (en) * | 2014-07-21 | 2015-01-28 | 阮玉德 | A kind of intramedullary pin |
| WO2015052841A1 (en) * | 2013-10-11 | 2015-04-16 | プロスパー株式会社 | Device for osteosynthesis and osteosynthesis |
| CN106821479A (en) * | 2017-01-20 | 2017-06-13 | 刘学进 | Fractured near end of thighbone improves intramedullary nail inner fixing device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122141A (en) * | 1990-08-30 | 1992-06-16 | Zimmer, Inc. | Modular intramedullary nail |
| CN1155345C (en) * | 1997-07-30 | 2004-06-30 | Aap培植股份公司 | Intramedullary osteosynthesis nail system capable of being used in all human and animal bones to heal fractures or for lengthening bones |
| CN2430122Y (en) * | 2000-02-29 | 2001-05-16 | 陈唯宁 | Concave groove type non-expanding bone marrow cross locking intramedullary nail |
| CN202263047U (en) * | 2011-10-10 | 2012-06-06 | 常州市武进金兴达医疗器械有限公司 | Interlocking intramedullary nail |
| CN206355122U (en) * | 2016-10-25 | 2017-07-28 | 景传生 | A kind of intelligent orthopaedics lock intramedullary nail |
| CN209091592U (en) * | 2018-02-08 | 2019-07-12 | 常州集硕医疗器械有限公司 | Adjustable intramedullary nail |
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2021
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015052841A1 (en) * | 2013-10-11 | 2015-04-16 | プロスパー株式会社 | Device for osteosynthesis and osteosynthesis |
| CN204121149U (en) * | 2014-07-21 | 2015-01-28 | 阮玉德 | A kind of intramedullary pin |
| CN106821479A (en) * | 2017-01-20 | 2017-06-13 | 刘学进 | Fractured near end of thighbone improves intramedullary nail inner fixing device |
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Inventor after: Yin Qudong Inventor after: Rui Yongjun Inventor before: Bo Fanyu Inventor before: Yin Qudong |
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