CN212755855U - Tension trabecula reconstruction type proximal femoral intramedullary nail internal fixation device - Google Patents

Abstract

The utility model relates to a tension bone trabecula reconstruction type proximal femoral intramedullary nail internal fixation device, which comprises a main nail body, a tension trabecula reconstruction device and a locking device; the main nail body is provided with two horizontal tension holes at the near end on the basis of the existing intramedullary nail, and threads are arranged in the tension holes; the tension trabecula reconstruction device comprises an anchor and a titanium cable, wherein the tail part of the anchor is provided with a channel, and the titanium cable is fixedly arranged in the tail channel of the anchor; the locking device comprises a contraction part, an upper port, an outer shell and a rotating shaft. Its advantages are: the utility model discloses simple structure, the practicality is strong, rebuilds device and locking device through utilizing the pulling force trabecula to rebuild thighbone neck tension nature bone trabecula, accords with the anatomical structure of thighbone neck, makes the internal fixation exert the synergism of tension nature bone trabecula and pressure nature bone trabecula, improves thighbone near-end fracture internal fixation's stability jointly to improve the treatment of internal fixation.

Description

Tension trabecula reconstruction type proximal femoral intramedullary nail internal fixation device

Technical Field

The utility model belongs to the technical field of medical instrument technique and specifically relates to a tension nature trabecula is rebuild type thighbone near-end intramedullary nail internal fixation device.

Background

The trabecular bone is the extension of cortical bone in cancellous bone, i.e. the trabecular bone is connected with cortical bone and has an irregular three-dimensional network structure in the medullary cavity. Trabecular bone is the main supporting structure of proximal femur, and can be divided into pressure trabecular bone and tension trabecular bone according to the distribution, and is the extension of proximal femur cortical bone in cancellous bone. Therefore, the internal fixation system has an important effect on the fixation of the fracture, the internal fixation system clinically used at present is mostly in a support reconstruction type, namely, the reconstruction of the pressure trabecula, but for unstable fracture, the reconstruction of the pressure trabecula is only carried out, the stable structure of the fracture cannot be completely recovered, and the re-displacement occurs after the functional activity, so that the fracture healing and recovery are influenced.

The Chinese patent application: CN202060856U discloses a novel proximal femur nail locking system for fixing proximal femur fracture, which is composed of 1 main nail, 2 proximal hollow self-tapping type locking nails and 2 distal self-tapping type locking nails. The design of 2 near-end hollow self-tapping type locking nails is different, 1 near-end hollow self-tapping type locking nail is a locking nail, the head part is provided with thick self-tapping threads with consistent thread spacing, the tail part is provided with thin threads, locking and fixing are formed between the locking nail and the main nail, the thread spacing is 1/2 of the thick threads at the head part, the thread directions of the locking nail and the main nail are consistent, and the fixed object can obtain pressurization with the length of 1 thin thread spacing when the locking nail is screwed for one circle (360 degrees); the 1 piece on the near side is a compression nail which can slide in the main nail hole to obtain compression fixation between fracture blocks. When the device is used, the lower part of the main nail is vertically inserted into a medullary cavity on the femur, then the near-end hollow self-tapping locking nail is screwed into the upper part of the main nail, the far-end self-tapping locking nail is screwed into the lower part of the main nail, and the tail cap of the main nail is screwed into the upper end of the main nail, thereby achieving the effect of fixing the fractured femur; however, since the proximal hollow self-tapping screw has a limited gripping force, particularly, has poor anti-rotation performance, the proximal hollow self-tapping screw may be withdrawn after a long time use, which may affect the operation effect, and the device is also a reconstruction pressure trabecula, which may not be used for unstable fracture patients.

The Chinese patent application: CN105640629A discloses a perfusion type biological intramedullary fixing device for proximal femoral fracture in osteoporosis, and belongs to the technical field of medical instruments. Comprises an intramedullary main nail, a sleeve, a hip screw and a cover cap; the hip screw is provided with a central hole which penetrates through the two ends; the far end of the screw is provided with a head part, and the side surface and the end part of the head part are provided with a plurality of through holes communicated with the central hole of the hip screw; the head is provided with spiral blade parts, and a groove is formed between every two adjacent spiral blade parts; a first rough surface coating is coated in the groove wall of the groove; the periphery of one end of the sleeve close to the head is coated with a second rough surface coating. The device enables bone to grow into the surface of the hip screw through the helical blade part, the sleeve end part and the rough surface coating on the sleeve end part, so that the hip screw is firmly held by the bone; and the fixing agent is filled between the hip screw and the sclerotin through the central hole of the hip screw, the hole on the wall of the hip screw hole and the head through hole so as to enhance the anchoring force between the hip screw and the sclerotin. However, the device cannot achieve a good fixing effect, although the bone cement filled in the device can prevent osteoporosis, the intramedullary main nail is a reconstruction main nail, so the fixing effect is not good, the broken bone part cannot be tensioned, hip screw displacement or internal fixation failure is often caused, the operation is too troublesome, and a medical plastic rubber tube and an injector are required to be carried with the device, so the popularization and the use are not facilitated.

Therefore, in summary, the currently used proximal femoral intramedullary nails are all supporting intramedullary nails for reconstructing pressure trabeculae, and the head nails support the femoral head and neck bone blocks, while the function of the tension trabeculae is ignored. So that complications such as hip varus, femoral head rotation and the like are easy to occur after operation. Therefore, there is a need for a novel tension bone trabecula reconstruction type proximal femoral intramedullary nail internal fixation device which can simultaneously enhance the anti-rotation and anti-inversion stress of the head and neck bone block, has good stability and certain firmness, and no report is found about the novel proximal femoral intramedullary nail internal fixation device.

Disclosure of Invention

The utility model aims at reconstructing the tension trabecula, leading the tension trabecula after reconstructing the fracture and the pressure trabecula to play a role together, and improving the stability of the fracture jointly so as to improve the effect of the treatment. In particular to a tension trabecular bone reconstruction type intramedullary nail internal fixation device at the proximal end of a femur.

In order to achieve the purpose, the utility model adopts the technical proposal that:

a tension trabecular bone reconstruction type intramedullary nail internal fixation device at the proximal end of a femur comprises a main nail body, a tension trabecular reconstruction device and a locking device; two horizontal circular tension holes are arranged at the near end of the main nail body, and threads are arranged inside the two tension holes; the tension trabecula reconstruction device comprises an anchor and a titanium cable, wherein the tail part of the anchor is provided with a channel, and the titanium cable is fixedly arranged in the tail channel of the anchor; the outer side of the anchor is also provided with a main thread and an auxiliary thread which are arranged at intervals;

the locking device comprises a contraction part, an upper port, an outer shell and a rotating shaft, wherein the contraction part is of a conical boss structure with a taper, a plurality of contraction grooves are longitudinally formed in a circular boss at the upper end of the contraction part to enable the contraction part to elastically contract in the axial direction, the lower end of the contraction part is of a conical boss structure with a taper, and a plurality of contraction grooves are also longitudinally formed in the boss to enable the lower end of the contraction part to elastically contract in the axial direction; the upper port is of a circular truncated cone-shaped structure and is connected with the upper end of the contraction part; the outer shell is a hollow cylinder, the outer surface of the outer shell is provided with an external thread matched with the tension hole, the inner part of the outer shell is also provided with a groove, and the outer shell is wrapped on the outer surface of the contraction part and is fixedly connected with the upper port; the inside of rotation axis run through have can pass through titanium cable through-hole, just rotation axis and constriction portion rotary type fixed connection.

In the above proximal intramedullary nail internal fixation device, as a preferable scheme, the horizontal interval between the two tension holes is 2mm, and the diameters of the two tension holes are 4-4.5 mm.

In the above proximal intramedullary nail fixation device, as a preferable scheme, the central axes of the two tension holes and the proximal axis of the main nail are respectively angled by 90-95 degrees in a front view and 5-6 degrees forwards and backwards in a side view.

In the above proximal intramedullary nail fixing device, as a preferable scheme, the anchor and the titanium cable are integrally arranged, and the diameter of the anchor is set to be 4-4.5mm, and the diameter of the titanium cable is set to be 2-2.5 mm.

In the above proximal intramedullary nail internal fixation device, as a preferable solution, the number of the shrinkage grooves on the upper end boss of the shrinkage part and the number of the shrinkage grooves on the lower end boss of the shrinkage part are both set to be even, the shrinkage grooves on the upper end boss of the shrinkage part and the shrinkage grooves on the lower end boss of the shrinkage part are staggered with each other, and the top outer diameter of the upper end boss of the shrinkage part is smaller than the top outer diameter of the positioning boss.

In the above-mentioned proximal intramedullary nail internal fixation device of femur, as an optimal scheme, pulling force trabecula rebuild the device or constitute by flat suture anchor and titanium cable area, flat suture anchor and titanium cable area formula structure as an organic whole set up, flat suture anchor also adopt the PEEK material to make, it is provided with the trompil along axial direction, the trompil extends and runs through the near-end face to the anchor body along axial direction, the fixed setting of titanium cable in the trompil of flat suture anchor, flat suture anchor open-ended both sides are provided with the sawtooth, the sawtooth be obtuse angle column structure, and to the expansion of distal end.

In the above proximal intramedullary nail internal fixation device, as a preferred embodiment, the locking device further includes a locking collet, the locking collet includes a conical locking clip and a cylindrical locking clip housing, the locking clip and the locking clip housing are integrally disposed, the locking clip is provided with a locking clip groove, the locking clip groove extends from the head to the upper edge of the bottom side, the bottom of the locking clip is provided with a hexagonal-angle rotating shaft, and a hollow channel for the titanium cable to pass through is further provided inside the hexagonal-angle rotating shaft; the surface of the locking clamp shell is provided with threads matched with the tension holes.

The utility model has the advantages that:

1. the utility model discloses simple structure, the practicality is strong, does benefit to pulling force trabecula and rebuilds device and locking device and rebuilds thighbone neck tension nature bone trabecula, makes the internal fixation exert the synergistic effect of tension nature bone trabecula and pressure nature bone trabecula, improves the stability of fracture internal fixation jointly to improve the treatment of internal fixation.

2. The utility model discloses in main thread on the anchor nail and the setting up of vice thread have increased the area of contact of anchor nail with the skeleton, increase the stability between anchor nail and the skeleton for the screw can not take place to rotate in the through-hole, and the structure is more stable, reduces patient's uncomfortable and feels.

3. In the utility model, the combined fixation of the main nail body and the tension trabecula rebuilding device can reduce the occurrence of hip inversion, increase the anti-rotation effect, reduce the stress born by the support trabecular bone and reduce the cutting of the tension screw; and after the implant, the ground anchor and the screw are in a three-plane distribution structure in the femoral head and neck, so that the anti-rotation and inversion stress of the head and neck bone block can be enhanced on the premise of meeting the mechanical property, and the supporting force of the femoral posterior column is enhanced, thereby achieving a more stable effect, effectively preventing the generation of complications of the later period of fracture of a patient, and improving the treatment effect.

Drawings

Fig. 1 is a schematic structural view of the internal fixation device for a tension trabecular bone reconstruction type proximal femoral intramedullary nail of the present invention.

Fig. 2 is a schematic structural view of the main nail body of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device of the present invention.

Fig. 3 is a side view of the main nail body of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device of the present invention.

Fig. 4 is a schematic connection diagram of the tension trabecular bone reconstruction device and the fixing device of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixing device of the present invention.

Fig. 5 is a schematic structural view of the locking device of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device of the present invention.

Fig. 6 is a schematic structural view of the upper contracting part of the locking device of the present invention.

Fig. 7 is a schematic view of the internal cross-section mechanism of the locking device of the internal fixation device for the proximal intramedullary nail of femur of the tension trabecular bone reconstruction type of the present invention.

Fig. 8 is a front plan view of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device arranged in the head-neck femur in the present invention.

Fig. 9 is a schematic view of the internal fixation device of the tension trabecular bone reconstruction type proximal femoral intramedullary nail of the present invention arranged in the axis of the internal nail of the head and neck femur.

Fig. 10 is a schematic structural view of the tension trabecular reconstruction type proximal intramedullary nail fixing device in embodiment 2.

Fig. 11 is a schematic structural view of a tension trabecular reconstruction device on the tension trabecular reconstruction type proximal intramedullary nail fixing device in example 2.

Fig. 12 is a schematic structural view of a locking device on the tension trabecular reconstruction type proximal intramedullary nail fixing device in embodiment 3.

Fig. 13 is a bottom view of the locking device of the proximal intramedullary nail of the femoral of the tension trabecular reconstruction type described in example 3.

Fig. 14 is a schematic structural view of a locking clip and a cylindrical locking clip housing of the locking device described in embodiment 3.

Detailed Description

The present invention will be further described with reference to the following detailed description. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by those skilled in the art after reading the disclosure of the present invention, and such equivalents also fall within the scope of the appended claims.

The reference numerals and components referred to in the drawings are as follows:

1. main nail body 2, tension trabecula rebuilding device 3, locking device

4. Tension hole 5, screw thread 21, anchor

22. Titanium cable 23, channel 24, main thread

25. Auxiliary thread 31, contraction part 32 and upper port

33. Outer shell 34, shrink groove 35, external screw thread

36. Groove 37, rotation shaft 38, through hole

6. Flat suture anchor 61, opening 62, serration

7. Locking clip 71, locking clip 72, locking clip housing

73. Locking clip groove 74. hexagonal corner angle rotating shaft 75. hollow channel

63. Titanium cable belt

Embodiment 1 a tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device

Referring to fig. 1-9, fig. 1 is a schematic structural view of the internal fixation device for a tension trabecular reconstruction type proximal femoral intramedullary nail of the present invention. Fig. 2 is a schematic structural view of the main nail body of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device of the present invention. Fig. 3 is a side view of the main nail body of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device of the present invention. Fig. 4 is a schematic connection diagram of the tension trabecular bone reconstruction device and the fixing device of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixing device of the present invention. Fig. 5 is a schematic structural view of the locking device of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device of the present invention. Fig. 6 is a schematic structural view of the upper contracting part of the locking device of the present invention. Fig. 7 is a schematic view of the internal cross-section mechanism of the locking device of the internal fixation device for the proximal intramedullary nail of femur of the tension trabecular bone reconstruction type of the present invention. Fig. 8 is a front plan view of the tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device arranged in the head-neck femur in the present invention. Fig. 9 is a schematic view of the internal fixation device of the tension trabecular bone reconstruction type proximal femoral intramedullary nail of the present invention arranged in the axis of the internal nail of the head and neck femur.

The utility model aims at providing a can rebuild tensile bone trabecula, its tensile bone trabecula after rebuilding the fracture can play a role with pressure bone trabecula together, improves the stability of fracture jointly to the patient improves the effect of treatment. The tension trabecular bone reconstruction type intramedullary nail internal fixation device comprises a main nail body 1, a tension trabecular reconstruction device 2 and a locking device 3; two horizontal circular tension holes 4 are formed at the near end of the main nail body 1, and threads 5 are arranged inside the two tension holes 4; the tension trabecula reconstruction device 2 comprises an anchor 21 and a titanium cable 22, wherein the anchor 21 is a PEEK anchor and has good biocompatibility, traditional titanium metal can be replaced, meanwhile, the anchor can be prevented from falling off, a channel 23 is arranged at the tail of the anchor, the titanium cable 22 is fixedly arranged in the channel 23 at the tail of the anchor, a main thread 24 and an auxiliary thread 25 are further arranged on the outer side of the anchor 21, the main thread 24 and the auxiliary thread 25 are arranged at intervals, the size of the main thread 24 is larger than that of the auxiliary thread 25, the arrangement of the main thread 24 and the auxiliary thread 25 can increase the contact area between the anchor 21 and bone, and the stability between the anchor 21 and bone is increased;

referring to fig. 5, 6 and 7, the locking device 3 includes a contracting portion 31, an upper port 32, an outer shell 33 and a rotating shaft 37, the contracting portion 31 is in a tapered conical boss structure, a plurality of contracting grooves 34 are longitudinally formed on a circular boss at the upper end of the contracting portion to enable the contracting portion 31 to elastically contract in the axial direction, the lower end of the contracting portion is in a tapered conical boss structure, and a plurality of contracting grooves 34 are also longitudinally formed on the boss to enable the lower end of the contracting portion to elastically contract in the axial direction; the upper port 32 is in a round table structure, and the upper port 32 is connected with the upper end of the contraction part; the outer shell 33 is a hollow cylinder, the outer surface of the outer shell 33 is provided with an external thread 35 matched with the tension hole, the inner part of the outer shell 33 is also provided with a groove 36, the groove 36 is matched with a contraction groove 34 at the lower end of the contraction part, and the outer shell 33 is wrapped on the outer surface of the contraction part 31 and is fixedly connected with the upper port 32; a through hole 38 for passing a titanium cable is arranged in the rotating shaft 37, and the rotating shaft 37 is rotatably and fixedly connected with the contraction part 31; the titanium cable 22 sequentially passes through the rotating shaft 37, the contraction part 31 and the upper port 32 of the locking device 3, when the device is locked, the rotating shaft 37 is rotated, the rotating shaft 37 drives the contraction grooves 34 at the upper end and the lower end of the contraction part 31 to contract and fasten, and then the titanium cable 22 is tightened.

In this embodiment, it is preferable that the horizontal distance between the two tension holes 4 is 2mm, the diameter of the two tension holes 4 is 4.2mm, and the two tension holes 4 are arranged at a distance to prevent the driven anchors 21 from crossing each other, so as to enhance the anti-rotation performance of the head and neck bone block.

In this embodiment, it is preferable that the two tension holes 4 respectively form an inclined angle of 5 ° with the axis of the proximal end of the main nail body 1 in the horizontal direction (see α in fig. 9), and the arrangement of the inclined angle of 5 ° conforms to the shape structure of the main nail body of the normal femoral intramedullary nail; the inclination angles of the inclination angles and the axis of the near end of the main nail body 1 in the vertical direction are 95 degrees (please refer to beta in the attached drawing 9), and the design that the tension hole 4 and the axis of the near end of the main nail body 1 form a certain inclination angle accords with the biomechanical performance, so that the implanted anchor and the implanted screw are in a three-plane distribution structure, the anti-rotation and inversion stress of the head and neck bone block can be enhanced on the premise of meeting the mechanical performance, the supporting force of the femoral rear column is enhanced, the supporting force between the anchor 21 and the implanted screw can be maximized, the more stable effect is achieved, the generation of the later-stage complications of the fracture of the patient is effectively prevented, and the treatment effect is improved.

Referring to fig. 4, in the present embodiment, preferably, the anchor 21 and the titanium cable 22 are integrally formed, and the diameter of the anchor 21 is set to be 4.1mm, and the diameter of the titanium cable 22 is set to be 2 mm. The anchor 21 passes through the tension hole 4 on the main nail body 1, the anchor 21 is implanted into a bone block by an external tool, the contact area between the anchor 21 and the bone is increased by the main thread 24 and the auxiliary thread 25 on the anchor 21, the stability between the anchor 21 and the bone is increased, the anchor cannot rotate in the through hole, the structure is more stable, and the discomfort of a patient is reduced.

Referring to fig. 5, 6 and 7, in this embodiment, the number of the contraction grooves 34 on the upper end boss of the contraction portion 31 and the number of the contraction grooves 34 on the lower end boss of the contraction portion 31 are preferably even, and the contraction grooves 34 on the upper end boss of the contraction portion and the contraction grooves 34 on the lower end boss of the contraction portion are preferably staggered with each other. When the rotating shaft 37 is operated, the nut inside the rotating shaft 37 presses the contraction groove 34 on the contraction part 34, so that the contraction groove 34 is contracted inwards to lock the titanium cable 22, and the even number of the nuts is arranged to ensure that the contraction part has certain uniformity during contraction.

The utility model discloses a use method: the main nail body is inserted into a far-end medullary cavity from the vertex of the femoral greater tuberosity, then the main nail body is fixed in a corresponding screw hole by a screw, then an anchor with a titanium cable is penetrated through a tension hole on the main nail body, the anchor with the titanium cable is implanted into a bone block of a patient by an external device, then a tightening device attached to the cable is implanted into the main nail body by rotation, then the titanium cable is tightened to draw the distance between the bone and the bone to be minimum, then a rotating shaft on a locking device is rotated, the rotating shaft drives a contraction groove on an internal contraction part to tighten, the fixing of the titanium cable is realized, the redundant titanium cable is reduced from the root part after the fixing is finished, after the fixing and the implanting are finished, a large amount of physiological saline is used for repeatedly flushing a wound, a deep fascia and subcutaneous skin are sequentially sutured, the wound is wrapped by pressurization, and the operation is finished; the fracture recovery of the injury treated by the operation has the characteristics of minimally invasive operation, no need of secondary operation taking out and the like, can effectively reduce various complications in the fracture recovery treatment process, improves the stability of the fracture, and achieves the expected ideal effect.

It should be noted that: the utility model has simple structure and strong practicability, and utilizes the tension trabecula rebuilding device and the locking device to rebuild the tension trabecula of the femoral neck, so that the internal fixation can play the synergistic effect of the tension trabecula and the pressure trabecula, and the stability of the internal fixation of the fracture can be improved together, thereby improving the treatment effect of the internal fixation; the main nail body, the anchor nail, the titanium cable rope and the locking device in the utility model are all disclosed in the prior art, and parts of the main nail body, the anchor nail, the titanium cable rope and the locking device are sold in the market, so that the detailed description is omitted; the utility model discloses in the fixed emergence that can reduce the hip enstrophe condition of device combined type is rebuild with the pulling force trabecula to main nail body, increase its anti-rotation effect, reduce the stress that supports the trabecula bone and undertake, reduce lag screw's cutting, and implant back anchor nail and screw and be three planar distribution structure in thighbone neck, under the prerequisite that accords with mechanical properties, can strengthen the anti-rotation of neck bone piece and the stress of enstrophe, strengthen the holding power of thighbone rear column, thereby reach more stable effect, the effectual production that prevents patient's fracture later stage complication, the effect of treatment is improved.

Embodiment 2 a tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device

Referring to fig. 10 and 11, fig. 10 is a schematic structural view of the internal fixation device for a tension trabecular reconstruction type proximal femoral intramedullary nail in this embodiment. Fig. 11 is a schematic structural diagram of a tension trabecular reconstruction device on the tension trabecular reconstruction type proximal femoral intramedullary nail internal fixation device in the embodiment.

The proximal femoral intramedullary nail internal fixation device in the utility model is substantially the same as the proximal femoral intramedullary nail internal fixation device in the embodiment, the difference is that the tension trabecula reconstruction device is different, the tension trabecula reconstruction device adopted in the embodiment is a flat suture anchor 6 and a titanium cable band 63, the flat suture anchor 6 and the titanium cable band 63 are arranged in an integrated manner, the flat suture anchor 6 is also made of PEEK material, the size of the flat suture anchor in the embodiment is the same as that of the anchor in the embodiment 1, and the flat suture anchor can pass through a tension hole and be fixed to a bone block of a person; the titanium cable tie 63 is fixedly arranged in the opening 61 of the flat suture anchor, sawteeth 62 are arranged on two sides of the opening of the flat suture anchor, the sawteeth 62 are of obtuse-angle structures, expand towards the far head end and can be driven into the flat suture anchor in a hammering mode. The two sides of the anchor opening 61 can be embedded with cancellous bone during knocking, so that the head end is forced to be expanded, and the fixation firmness is increased. It should be noted that: the utility model discloses in the pulling force hole of main nail proximal segment also can be the hole of rectangle, and with the shape and the size phase-match of this flat suture anchor nail, hole portion also has the titanium cable area locking structure of putting in addition.

Embodiment 3 a tension trabecular bone reconstruction type proximal femoral intramedullary nail internal fixation device

Referring to fig. 12-14, fig. 12 is a schematic structural view of the locking device of the proximal intramedullary nail fixing device of the tension trabecular reconstruction type femur in the present embodiment, and fig. 13 is a schematic bottom view of the locking device of the proximal intramedullary nail fixing device of the tension trabecular reconstruction type femur in the embodiment 3. Fig. 14 is a schematic structural view of a locking clip and a cylindrical locking clip housing of the locking device described in embodiment 3.

The proximal intramedullary nail internal fixation device of the present invention is substantially the same as the proximal intramedullary nail internal fixation device of the present embodiment, except that the fixation device is different, in the present embodiment, the locking device is a locking clip 7, the locking clip 7 includes a conical locking clip 71 and a cylindrical locking clip housing 72, the locking clip 71 and the locking clip housing 72 are integrally disposed, the locking clip 71 is provided with a locking clip groove 73, the locking clip groove 73 extends from the head to the upper edge of the bottom side, the bottom of the locking clip 71 is provided with a hexagonal angle rotating shaft 74, and the inside of the hexagonal angle rotating shaft 74 is further provided with a hollow channel 75 for the titanium cable to pass through; the surface of the locking clamp shell 72 is provided with threads 5 matched with the tension holes 4, when the titanium cable 22 enters the hollow channel 75 in the locking chuck, the hexagonal angle rotating shaft is adjusted by an external device (a hexagonal wrench), and the rotating shaft rotates to drive the head of the locking clamp 71 to contract, so that the titanium cable 22 is clamped, and the bone block is fastened and fixed.

It should be noted that: the type of the locking collet used in this embodiment may be SK16-6A, and the locking collet described in this embodiment is disclosed in the prior art, and is sold in the market (ER/SK/KP collet), the internal structure and the rotation locking principle of the locking collet are not described herein, and the size of the locking collet, the size of the diameter of the hollow channel, and the size of the diameter of the through hole are all the same as those of the locking device described in embodiment 1.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and additions can be made without departing from the principles of the present invention, and these improvements and additions should also be regarded as the protection scope of the present invention.

Claims (7)

1. A tension trabecular bone reconstruction type intramedullary nail internal fixation device at the proximal end of a femur is characterized by comprising a main nail body, a tension trabecular reconstruction device and a locking device; two horizontal circular tension holes are arranged at the near end of the main nail body, and threads are arranged inside the two tension holes; the tension trabecula reconstruction device comprises an anchor and a titanium cable, wherein the tail part of the anchor is provided with a channel, and the titanium cable is fixedly arranged in the tail channel of the anchor; the outer side of the anchor is also provided with a main thread and an auxiliary thread which are arranged at intervals;

the locking device comprises a contraction part, an upper port, an outer shell and a rotating shaft, wherein the contraction part is of a conical boss structure with a taper, a plurality of contraction grooves are longitudinally formed in a circular boss at the upper end of the contraction part to enable the contraction part to elastically contract in the axial direction, the lower end of the contraction part is of a conical boss structure with a taper, and a plurality of contraction grooves are also longitudinally formed in the boss to enable the lower end of the contraction part to elastically contract in the axial direction; the upper port is of a circular truncated cone-shaped structure and is connected with the upper end of the contraction part; the outer shell is a hollow cylinder, the outer surface of the outer shell is provided with an external thread matched with the tension hole, the inner part of the outer shell is also provided with a groove, and the outer shell is wrapped on the outer surface of the contraction part and is fixedly connected with the upper port; the inside of rotation axis run through have can pass through titanium cable through-hole, just rotation axis and constriction portion rotary type fixed connection.

2. The intramedullary nail internal fixation device of claim 1, wherein the horizontal spacing between the two tension holes is 2mm, and the diameter of the two tension holes is 4-4.5 mm.

3. The intramedullary nail internal fixation device of claim 1, wherein the central axes of the two pull holes are angled 90-95 ° from the proximal main nail axis in a frontal view and 5-6 ° forward and backward in a lateral view, respectively.

4. The intramedullary nail fixing device of claim 1, wherein the anchor and the titanium cable are integrally formed, and wherein the diameter of the anchor is set to be 4-4.5mm and the diameter of the titanium cable is set to be 2-2.5 mm.

5. The intramedullary nail internal fixation device of claim 1, wherein the number of the contraction grooves on the upper end boss of the contraction portion and the number of the contraction grooves on the lower end boss of the contraction portion are both set to be an even number, the contraction grooves on the upper end boss of the contraction portion and the contraction grooves on the lower end boss of the contraction portion are staggered with each other, and the top outer diameter of the upper end boss of the contraction portion is smaller than the top outer diameter of the positioning boss.

6. The intramedullary nail internal fixation device of any one of claims 1 to 5, wherein the tension trabecular reconstruction device comprises a flat suture anchor and a titanium cable, the flat suture anchor and the titanium cable are also provided as an integral structure, the flat suture anchor is also made of PEEK material and is provided with an opening along the axial direction, the opening extends along the axial direction and penetrates through the proximal surface of the anchor body, the titanium cable is fixedly provided in the opening of the flat suture anchor, two sides of the opening of the flat suture anchor are provided with saw teeth, and the saw teeth are of obtuse-angle structures and expand towards the distal end.

7. The intramedullary nail internal fixation device of any one of claims 1 to 5, wherein the locking device further comprises a locking collet, the locking collet comprises a conical locking clip and a cylindrical locking clip housing, the locking clip and the locking clip housing are integrally arranged, the locking clip is provided with a locking clip groove, the locking clip groove extends from the head to the upper edge of the side edge of the bottom, the bottom of the locking clip is provided with a hexagonal rotating shaft, and a hollow channel for the titanium cable to pass through is further arranged inside the hexagonal rotating shaft; the surface of the locking clamp shell is provided with threads matched with the tension holes.

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