CN219306897U

CN219306897U - Intramedullary fixation system for fracture end

Info

Publication number: CN219306897U
Application number: CN202220198297.7U
Authority: CN
Inventors: 陈聚伍
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2023-07-07
Anticipated expiration: 2032-01-25

Abstract

The utility model discloses an intramedullary fixation system for fracture ends, which comprises an intramedullary main nail sleeved at the end part of a bone cavity, and also comprises a transverse rod piece and a longitudinal rod piece, wherein transverse perforations are arranged at the outer end part of the intramedullary main nail, the transverse rod piece is matched and fixed in the transverse holes, a series of longitudinal perforations are distributed on the transverse rod piece, and at least one longitudinal rod piece is matched and sleeved and fixed in the corresponding longitudinal perforation. The utility model belongs to minimally invasive surgery, can firmly fix fracture ends such as distal radius fracture, is particularly suitable for effectively treating comminuted fracture at fracture ends, and can fix a plurality of bone fragments simultaneously.

Description

Intramedullary fixation system for fracture end

Technical Field

The utility model belongs to the technical field of fracture end fixing instruments, and particularly relates to an intramedullary fixation system for fracture ends.

Background

The fracture of radius distal end is very common, and the fracture takes place in radius distal end 2 to 3cm within range, often accompanies the damage of wrist joint of radius and lower ulnar radial joint, and the fixed mode behind the radius fracture is mostly all fixed to closed reset gypsum at present, prevents that patient's wrist from rotating and causing the influence to the reduction of fracture department, but current radius distal end fracture fixing device operation is comparatively complicated, makes medical personnel wasted a large amount of time and energy when fixed, and patient's palm often can be fixed transversely, and long-time transverse fixation makes patient's palm comparatively uncomfortable, has increased patient's misery.

In addition, the distal radius fracture also comprises an external fixing support, the external fixing support is an external medical instrument widely applied to the fields of wound orthopaedics, limb reconstruction and the like, at present, the external fixing support adopts a nail rod system, wherein the external fixing screw and the external fixing rod are connected in a nail clamp fixing mode. The external fixing support has no defects of unstable broken ends and small mobility caused by a movable joint connection mode and the joint later-stage stiffness, movement disorder and the movable joint connection mode, and is very inconvenient for the patient to move.

An elastic radius fracture external fixation frame with the publication number of CN203074838U comprises a fracture proximal end fixing part, a fracture distal end fixing part and a connecting part for connecting the fracture proximal end fixing part and the fracture distal end fixing part. The scheme comprises a fracture distal end fixing part, a fracture proximal end fixing part and a connecting part, wherein the connecting part is fixed in an elastic mode of distal end suspension, and because the mode has small influence on the movement of joints in all directions and good fracture stability, a longer screw is required for nailing and fixing in the scheme, so that the exposed screw length of a limb is longer, the movable limb and dressing of a patient are difficult, the carrying convenience of the patient is seriously influenced, and huge pain is brought to the patient, especially the patient needs to carry for a long time; because the nail clamps exist, a plurality of nail clamps cannot be placed in a short distance, namely a plurality of external fixing screws cannot be placed in a short distance, when a fracture is positioned at the far end or the near end of a diaphysis, a plurality of screws cannot be placed at the far end or the near end of a shorter fracture, so that the fracture needs to be fixed across joints, and the joint function is affected. The utility model discloses a radius distal end is external fixation device for fracture, including the arc layer board, the surface of arc layer board has the backup pad through bolt threaded connection, and the spacing groove has been seted up to the inner wall of backup pad, and the inner wall sliding connection of spacing groove has the horizontal pole, the one end fixedly connected with support column of horizontal pole, the bottom fixedly connected with spacing cylinder in support column middle part, the surface swing joint of backup pad has the pull rod, the one end fixedly connected with pull ring of pull rod, the inner wall fixedly connected with magic subsides of arc layer board. The arc-shaped supporting plate of the external fixing support is huge in size, so that the joint is stiff and the joint is movable, and the movable joint connection mode has the defects of unstable broken ends and small mobility, so that the patient is very inconvenient to move.

Bone end fractures often accompany comminuted fractures, multiple bone fragments can appear, and are not easily fixed. The existing fixation by the steel plate belongs to invasive surgery, has the advantages of large trauma, high probability of accidental injury, infection and disunion, delayed healing, broken nails and broken plates, large postoperative scars, attractive appearance influence, no compliance with the minimally invasive principle, and the intramedullary nail adopts a closed and minimally invasive technology, so that the intramedullary nail with the lock can prevent fracture rotation deformity and reduce the fracture risk of the built-in objects. In addition, the bone end structure is special, the bone surface is uneven, and the firmness degree of the single-piece steel plate and part of the screws is still to be improved.

Disclosure of Invention

Aiming at the problem that no minimally invasive surgical instrument for treating the bone end fracture is effective in the prior art, the utility model provides an intramedullary fixation system for the bone end, which is used for effectively treating comminuted fracture and simultaneously fixing a plurality of bone fragments.

The utility model solves the technical problems by adopting the scheme that: the intramedullary fixation system for fracture end comprises an intramedullary main nail sleeved at the end part of a bone cavity, a transverse rod piece and a longitudinal rod piece, wherein transverse perforations are arranged at the outer end part of the intramedullary main nail, the transverse rod piece is matched and fixed in the transverse holes, a series of longitudinal perforations are distributed on the transverse rod piece, and at least one longitudinal rod piece is matched and sleeved in the corresponding longitudinal perforations.

The transverse hole is of a rectangular structure, the transverse rod piece is a strip-shaped plate, and the transverse rod piece is matched and sleeved in the transverse hole.

The sleeve fixing structure between the cross rod piece and the intramedullary main nail is characterized in that threaded parts are respectively arranged at two ends of the cross rod piece, and locking nuts are arranged on the threaded parts in a matching mode.

The sleeve fixing structure between the transverse rod piece and the intramedullary main nail is characterized in that a longitudinal positioning hole is formed in the intramedullary main nail, a central positioning hole is formed in the center of the transverse rod piece, the transverse rod piece is fixed to the upper portion of the intramedullary main nail after being connected with the longitudinal positioning hole and the central positioning hole in a penetrating mode through a central screw rod, the longitudinal positioning hole is located at a position corresponding to the side wall of the transverse hole, and when the transverse rod piece is installed in the transverse hole in a penetrating mode, the central screw rod penetrates through the longitudinal positioning hole and the central positioning hole at the same time, and therefore the transverse rod piece is fixed to the intramedullary main nail.

The sleeve fixing structure between the transverse rod piece and the intramedullary main nail is characterized in that an axle center screw hole is formed in the outer end axle center of the intramedullary main nail, an axle center locking nail is arranged in the axle center screw hole in a matching mode, and when the transverse rod piece is arranged in the transverse hole in a penetrating mode, the axle center locking nail fixedly presses the middle of the transverse rod piece from the top, and therefore the transverse rod piece is fixed together with the intramedullary main nail.

The distal end of the intramedullary main nail can also be provided with a lock hole and is matched with and provided with a lock nail.

A series of longitudinal perforations are distributed on the transverse rod pieces, the inner walls of the longitudinal perforations are respectively provided with internal threads, and the longitudinal rod pieces are also respectively provided with external threads, so that each longitudinal rod piece can be in threaded connection with the corresponding longitudinal perforation internal threads.

The longitudinal rod piece adopts a threaded longitudinal rod piece, one end of the longitudinal rod piece comprises a cap part, the other end of the longitudinal rod piece is provided with a lock nut, or both ends of the longitudinal rod piece are provided with lock nuts, and both sides of the fracture end part are simultaneously pressurized and fixed by utilizing the lock nuts at both ends.

The longitudinal perforation of the transverse rod piece is a strip-shaped hole without threads, the longitudinal rod piece is plate-shaped, and the plate-shaped longitudinal rod piece can be matched and sleeved in the corresponding strip-shaped hole in a penetrating manner.

The middle part of the upper side of the cross rod piece is provided with a concave plane, and the inner end plane of the axial lock pin is inserted into the concave plane to form a lock pin relationship.

The rear part of part or all of the longitudinal members is designed into a wedge-shaped structure (28), namely the front end width of the longitudinal members is smaller than the rear end width, and the side surfaces are inclined surfaces.

The utility model has the beneficial effects that: the utility model belongs to minimally invasive surgery, can firmly fix fracture ends such as distal radius fracture, is particularly suitable for effectively treating comminuted fracture at fracture ends, and can fix a plurality of bone fragments simultaneously.

The intramedullary main nail is used for being implanted from the drill hole of the fracture end part, and the outer end (the upper end) of the intramedullary main nail is kept at the corresponding position of the fracture end inner cavity. The bone end part is transversely drilled and reamed into an approximately rectangular structure, the shape of the bone end part is matched with that of the transverse hole, the transverse rod piece is inserted in a penetrating mode, namely, the two ends of the transverse rod piece are inserted into reamers of a bone cavity, and the middle part of the transverse rod piece is inserted into transverse holes of the intramedullary main nail. The intramedullary main nails are used as main supporting parts, the cross rod parts are fixed at the ends of the fracture, and the cross rod parts are used as supporting parts, so that a plurality of longitudinal rod parts are fixed on the cross rod parts, thereby forming a vertical, transverse and longitudinal three-dimensional structure. The fracture end forms a high-strength supporting structure, and can fix a plurality of broken bone fragments at the same time, and the operation mode is relatively simple and standard. In addition, the two ends of the lock nut are matched with the longitudinal rod piece to simultaneously provide pressure on two sides of the fracture end part, so that the compression fixation is realized.

The longitudinal rod piece can also be designed into a plate shape and can be matched and sleeved in the corresponding strip-shaped hole in a penetrating way. The width direction of the plate shape can be transverse, vertical or oblique, and various types can be selected according to corresponding requirements.

The center of the cross rod piece is provided with a center positioning hole, and the cross rod piece is fixed on the upper part of the intramedullary main nail after being connected with the longitudinal positioning hole and the center positioning hole in a penetrating way through a center screw rod. Or the outer end axle center of the intramedullary main nail 1 is provided with an axle center screw hole, and an axle center locking nail is arranged in the axle center screw hole in a matching way. When the cross rod piece is installed in the crossing hole in a penetrating way, the shaft center locking nail fixedly presses the middle part of the cross rod piece from the top, so that the cross rod piece is fixed together with the intramedullary main nail.

When the middle part of the cross rod piece is designed with a strip-shaped cross hole, the plurality of longitudinal rod pieces are respectively provided with self-tapping threads with thread blade parts and can be respectively screwed into corresponding positions in the strip-shaped cross hole of the cross rod piece. When the honeycomb porous structure is designed in the middle of the transverse rod piece, the self-tapping of the threaded blade parts of the plurality of longitudinal rod pieces can be screwed into the corresponding through holes in the honeycomb porous structure of the transverse rod piece. Thereby providing a wide range of stationary environments.

It is also possible to design the rear part of some or all of the longitudinal bars as a wedge-shaped structure, which increases the strength of the connection as the pressure increases after connection to the traversing holes.

Drawings

Fig. 1 is a schematic diagram of an example structure of the present utility model.

Fig. 2 is a schematic diagram of the assembly relationship of fig. 1.

Fig. 3 is a schematic side view of the song of fig. 1.

Fig. 4 is a schematic view of a cross bar member double lock nut structure.

Fig. 5 is a schematic view of an assembled structure of the plate type cross bar member.

Fig. 6 is a schematic diagram of the center screw assembly relationship.

Fig. 7 is a schematic diagram of an axial lock wire assembly relationship.

Fig. 8 is a schematic view of a bar-shaped hole structure of the cross bar member.

FIG. 9 is a second schematic view of the bar hole structure of the cross bar member.

Fig. 10 is a schematic view of the combined rail structure.

Fig. 11 is a schematic view of a honeycomb cross-bar structure.

Fig. 12 is a schematic view of a construction of the longitudinal bar member.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

Example 1: an intramedullary fixation system for fractured ends, as shown in fig. 1, mainly comprises a vertical intramedullary main nail 1, a transverse cross bar member 2 and a longitudinal bar member 5. The components are sequentially sleeved and fixed together, the combined body is applied to the fracture end part, and the system is mainly designed aiming at the existing lack of effective minimally invasive surgical instruments for fracture at the bone end part so as to effectively treat comminuted fracture and fix a plurality of bone fragments simultaneously.

Specifically, as can be seen from fig. 1 and 2, the upper portion of the intramedullary main nail 1 is provided with a transverse perforation 3, in this embodiment, the transverse perforation 3 is rectangular in shape, the cross bar member 2 is of a plate-type structure, and the transverse perforation 3 matches or approximately matches the shape of the cross bar member 2.

The intramedullary main nail 1 is used for implantation from the bore of the fracture end, keeping its outer end (upper end) in the corresponding position of the fracture end cavity. The distal end of the intramedullary main nail 1 may also be provided with a locking hole 6 and fitted with a locking nail. I.e. the distal end of the intramedullary main nail 1 is deep into the bone cavity, holes are drilled in the corresponding positions of the bone cavity wall, and the locking nails extend from the bone cavity wall holes into the locking holes 6 for connection, so that the intramedullary main nail 1 can be fixed in the bone cavity.

The bone end is transversely drilled and reamed into an approximately rectangular structure, and is matched with the shape of the transverse hole 3, the transverse rod piece 2 is inserted in a penetrating manner, namely, the two ends of the transverse rod piece are inserted into the reamers of the bone cavity, and the middle part of the transverse rod piece is inserted into the transverse hole 3 of the intramedullary main nail 1.

As can be seen in fig. 2, threaded portions are provided at both ends of the cross bar member 2, respectively, and a locking nut 7 is fitted to each threaded portion in a matching manner. The locking nut and the cross rod piece are arranged, and the locking nuts at two sides are respectively pressed at the reaming positions at the outer sides of the bone walls. The locking nut may be designed to include a spacer or be fitted inside the locking nut, preferably matching the outer surface of the bone wall.

As shown in fig. 2, a series of longitudinal through holes 4 are distributed on the transverse rod member, and in this embodiment, the inner wall of each longitudinal through hole 4 is provided with an internal thread. Each longitudinal rod member is also provided with an external thread, so that each longitudinal rod member can be connected with the corresponding internal thread of the longitudinal through hole in a threaded manner.

Specifically, the longitudinal drilling is carried out at the end part of the fracture, including the longitudinal drilling along the broken bone pieces, the longitudinal rod piece is penetrated into the bone segments or the broken bone pieces, and the inner end of the longitudinal rod piece is connected with the longitudinal perforation of the cross rod piece in a threaded manner, so that a stable structure is formed.

Based on the above structural features, as shown in fig. 3, the intramedullary main nail 1 is used as a main support member, the cross bar member is fixed to the fracture end, and the cross bar member is used as a support member, and the plurality of longitudinal bar members are fixed to the cross bar member, thereby forming a vertical, lateral and longitudinal three-dimensional structure. The fracture end forms a high-strength supporting structure, and can fix a plurality of broken bone fragments at the same time, and the operation mode is relatively simple and standard. The system can effectively treat comminuted fracture and fix a plurality of bone fragments simultaneously.

Example 2: based on the structural scheme of the embodiment 1, the longitudinal rod piece adopts the structural form shown in fig. 4, namely, a threaded longitudinal rod piece is adopted, one end of the longitudinal rod piece comprises a cap part, and the other end of the longitudinal rod piece is provided with a second lock nut 8. Or two locking nuts 8 are arranged at both ends. Therefore, the two ends of the locking nut are matched with the longitudinal rod piece to simultaneously provide pressure on two sides of the fracture end part, so that the compression fixation is realized.

Example 3: on the basis of the embodiment 1, the longitudinal perforation of the transverse rod piece 2 is designed as a strip-shaped hole 10, and is free of threads, namely a through hole. The longitudinal bars are plate-shaped 9 which can be inserted through corresponding bar-shaped holes 10. As can be seen in fig. 5, the two ends of the plate-shaped longitudinal bar are respectively provided with a thread section and are respectively connected with a lock nut. The plate-shaped longitudinal bar member of the present embodiment has no possibility of rotation. The width direction of the plate can be either transverse (as shown in fig. 5) or vertical, or oblique, and various types can be selected according to the corresponding requirements. I.e. the corresponding longitudinal perforations may be flat, upright and slanted.

Example 4: on the basis of embodiment 2, a plane 12 is arranged on the side surface of the longitudinal bar, as shown in fig. 6, a plane 11 is arranged on the inner wall of the longitudinal hole, and the two planes are matched and sleeved, so that the longitudinal bar has no possibility of rotating.

Example 5: on the basis of the embodiment 1, the intramedullary main nail 1 is designed to be provided with a longitudinal positioning hole 13, the center of the cross rod member 2 is provided with a center positioning hole, and the cross rod member 2 is fixed on the upper part of the intramedullary main nail 1 after being connected with the longitudinal positioning hole 13 and the center positioning hole in a penetrating way through a center screw rod 14. As shown in fig. 6, the longitudinal positioning holes 13 are located at the positions corresponding to the side walls of the transverse holes 3, and when the transverse rod 2 is installed through the transverse holes 3, the central screw 14 is simultaneously inserted through the longitudinal positioning holes 13 and the central positioning holes, so that the transverse rod is fixed together with the intramedullary main nail 1.

Example 6: on the basis of the embodiment 1, an axle center screw hole 15 is arranged at the axle center of the outer end of the intramedullary main nail 1, and an axle center locking nail 16 is arranged in the axle center. After the cross bar member 2 is installed through the transverse hole 3, the axial lock pin 16 presses the middle part of the cross bar member from the top, thereby fixing the cross bar member together with the intramedullary main pin 1. As can be seen in fig. 7, a recessed flat surface 17 may be further provided in the middle of the upper side of the cross member, with the inner end flat surface of the axial pin 16 being inserted into the recessed flat surface 17 to form a pin relationship.

Example 7: on the basis of example 1, the cross bar member is designed as shown in fig. 8, i.e., a bar-shaped cross hole 18 is designed in the middle of the cross bar member. Correspondingly, the plurality of longitudinal bars are self-tapping 19 with thread blade parts, the outer diameter of the self-tapping thread is slightly larger than the width of the transverse perforation, so that each automatic thread can be screwed into the corresponding position in the strip-shaped transverse perforation 18 of the transverse bar.

The present embodiment is designed mainly for irregular distribution of fracture fragments or a large number of fragments, and the longitudinal rod member can be penetrated and fixed along the center of the broken bone fragments, and the bar-shaped transverse perforation 18 provides a wide fixing environment.

Example 8: on the basis of embodiment 7, as shown in fig. 9, a series of protruding parts 21 are further arranged in the strip-shaped transverse through hole 18 at equal intervals, and grooves 20 are formed between the adjacent protruding parts, wherein a plurality of grooves are distributed in parallel, and any groove can be selected to be used for adapting to corresponding bone fragments. The boss and the inner wall of the channel can have more contact area with the self-tapping 19.

Example 9: on the basis of embodiment 7, the cross bar member is an inter-inserting assembly comprising two U-shaped bars, as shown in fig. 10, a right U-shaped bar 23 is sleeved on the outer side of a left U-shaped bar 22, and fork bars of the two U-shaped bars are distributed elastically and have certain deformability. The fork contact surfaces of the two U-shaped rods are designed into convex-concave connection structures 24. The outer ends of the two U-shaped rods are distributed with annular outer pressing plates 26. A convex-concave connection structure 25 is arranged between the outer side surface of the fork rod of the right (outer) U-shaped rod and the inner wall of the crossing hole. The clearance of the left U-shaped rod 22 is equivalent to the strip-shaped cross perforation 18 in the embodiment 8, the plurality of longitudinal rod members are self-tapping 19 with thread blade parts, the thread outer diameter of the self-tapping is slightly larger than the width of the clearance of the left U-shaped rod 22, and therefore each automatic thread can be screwed into the corresponding position in the clearance of the left U-shaped rod 22.

During installation, the right U-shaped rod is inserted into the right U-shaped rod to be matched and sleeved in place through the transverse holes, and then the left rod is inserted into the right U-shaped rod to be matched and sleeved in place with the right rod. While pressing the annular outer pressure plates 26 of the two side U-shaped rods inward to enhance maintaining the compression of the two sides of the fracture end.

It can be seen that the combination cross bar member employed in this embodiment is not only firmly connectable to the transverse bore of the intramedullary nail 1, but also firmly connectable to each other, and that the male and female engagement structure is capable of maintaining a certain inward pressure without slackening.

Example 10: on the basis of example 1, a cross bar member was designed as shown in fig. 11, i.e., a honeycomb-shaped porous structure 27 was designed in the middle of the cross bar member. Specifically, the cross bar member includes an outer rectangular frame with a honeycomb-like porous structure 27 inside. Correspondingly, the plurality of longitudinal members are each self-threading 19 having a thread edge portion with a thread outer diameter slightly greater than the inner diameter of the honeycomb perforations so that each of the automatic threads can be threaded into a corresponding perforation in the honeycomb porous structure 27 of the transverse member, respectively.

Implementation 11: on the basis of the above implementation, the rear part of part or all of the longitudinal members is designed into a wedge-shaped structure 28, namely the front end width of the longitudinal members is smaller than the rear end width, and the side surfaces are inclined surfaces. As shown in fig. 12, after such a longitudinal bar is connected to the crossing hole 3, as the pressure increases, the connection strength increases. It is not excluded to provide male-female engagement structures or saw-tooth structures in the transverse bores or on the sides of the wedge-shaped structures.

On the basis, the far end of a longitudinal rod piece with a wedge-shaped structure is also provided with a thread section for installing a second lock nut 8.

It can be seen that the present embodiment is designed mainly for irregular distribution of fracture fragments or a large number of fragments, different self-tapping can select lateral movement or vertical movement, and finally the best screwing position is selected and then connected to the cellular porous structure 27, so that the use of the cellular porous structure 27 in the present embodiment provides a wider fixation environment.

Claims

1. The intramedullary fixation system for the fracture end comprises an intramedullary main nail (1) sleeved at the end part of a bone cavity, and is characterized by further comprising a transverse rod piece (2) and a longitudinal rod piece (5), wherein transverse holes (3) are formed in the outer end part of the intramedullary main nail (1), the transverse rod piece (2) is matched and sleeved in the transverse holes (3), a series of longitudinal holes (4) are distributed on the transverse rod piece (2), and at least one longitudinal rod piece (5) is matched and sleeved in and fixed in the corresponding longitudinal holes (4).

2. The intramedullary fixation system of claim 1, wherein the transverse bore (3) is rectangular in configuration, the cross bar member (2) is a bar plate, and the cross bar member (2) fits snugly within the transverse bore (3).

3. The intramedullary fixation system of a fractured end according to claim 1 or (2), wherein the sleeve fixation structure between the cross bar member and the intramedullary main nail is characterized in that threaded parts are respectively arranged at two ends of the cross bar member (2), and a locking nut (7) is arranged at each threaded part in a matching way.

4. The intramedullary fixation system of a fracture end according to claim 1 or 2, wherein the sleeve fixation structure between the cross rod member and the intramedullary main nail is characterized in that a longitudinal positioning hole (13) is formed in the intramedullary main nail (1), a center positioning hole is formed in the center of the cross rod member (2), the cross rod member (2) is fixed on the upper portion of the intramedullary main nail (1) after being connected with the longitudinal positioning hole (13) and the center positioning hole in a penetrating way through a center screw rod (14), the longitudinal positioning hole (13) is positioned at a position corresponding to the side wall of the cross hole (3), and when the cross rod member (2) is installed in the cross hole (3), the center screw rod (14) penetrates through the longitudinal positioning hole (13) and the center positioning hole at the same time, so that the cross rod member is fixed together with the intramedullary main nail (1).

5. The intramedullary fixation system of a fracture end according to claim 1 or 2, wherein the sleeve fixation structure between the transverse rod member and the intramedullary main nail is that an axial screw hole (15) is arranged at the axial center of the outer end of the intramedullary main nail (1), an axial lock nail (16) is arranged in the sleeve fixation structure in a matching way, when the transverse rod member (2) is arranged in the transverse hole (3) in a penetrating way, the axial lock nail (16) presses the middle part of the transverse rod member from the top, so that the transverse rod member is fixed together with the intramedullary main nail (1), a concave plane (17) is arranged at the middle part of the upper side of the transverse rod member, and the inner end plane of the axial lock nail (16) is inserted into the concave plane (17) to form a locking nail relationship.

6. The fracture end intramedullary fixation system of claim 1, wherein a locking hole (6) is provided at the distal end of the intramedullary main nail (1) and a locking nail is fitted.

7. The intramedullary fixation system of claim 1, wherein a series of longitudinal bores (4) are distributed on the transverse rod members, each longitudinal bore (4) having an internal thread on an inner wall thereof and an external thread on the longitudinal rod members, such that each longitudinal rod member is threadably received within a corresponding longitudinal bore internal thread.

8. The intramedullary fixation system of claim 1, wherein the longitudinal rod member is a threaded longitudinal rod member having a cap at one end and a second locking nut (8) at the other end, or wherein the second locking nut (8) is mounted at both ends of the longitudinal rod member, and wherein both sides of the fracture end are simultaneously compression-fixed by the second locking nut at both ends.

9. The intramedullary fixation system of a fractured end according to claim 1, characterized in that the longitudinal perforations of the cross bar members (2) are bar-shaped holes (10) without threads, the longitudinal bar members are plate-shaped (9) which can be matched and sleeved in the corresponding bar-shaped holes (10) in a penetrating manner.

10. The intramedullary fixation system of claim 5, wherein a wedge-shaped structure (28) is configured at a rear portion of some or all of the longitudinal members, i.e., the longitudinal members have a smaller front end width than rear end width and are beveled on sides.