CN214907929U

CN214907929U - Intramedullary pin

Info

Publication number: CN214907929U
Application number: CN202120828483.XU
Authority: CN
Inventors: 逢大勇; 许洪涛; 李志敏; 齐义成; 刘锦; 王龙
Original assignee: TIANJIN JINXINGDA INDUSTRIAL CO LTD
Current assignee: TIANJIN JINXINGDA INDUSTRIAL CO LTD
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-11-30
Anticipated expiration: 2031-04-21

Abstract

The utility model provides an intramedullary needle, include: the main needle comprises a needle rod, a fixing hole penetrating through the needle rod is formed in the needle rod, a clamping column is arranged in the fixing hole, and the fixing hole is provided with an inlet and an outlet; the power rod comprises an insertion end and a fixed end which are opposite in the length direction, a clamping groove which extends along the axial direction of the power rod is arranged on the outer wall surface of one part of the power rod, the end part, adjacent to the insertion end, of the clamping groove is opened so as to form an opened end, and the other end of the clamping groove is a closed end; and the anti-rotation screw penetrates through the main needle, and an included angle is formed between the axis of the anti-rotation screw and the axis of the power rod. Therefore, the intramedullary needle according to the embodiment of the present invention has the advantages of facilitating the position limitation and installation of the power rod, and preventing the intramedullary needle (especially the power rod) from rotating, thereby preventing the intramedullary needle from hurting the human body.

Description

Intramedullary pin

Technical Field

The utility model relates to an orthopedic implant field, concretely relates to intramedullary needle.

Background

In the related art, intramedullary nail fixation is often used for fracture of long tubular bone (such as femur, humerus, ulna, tibia, radius, etc.) shaft. The intramedullary pin is firm and firm, can be fixed with little or no external fixation after operation, and is beneficial to the early movement and exercise of injured limbs; the skin incision is small, the periosteum stripping range is limited, and the damage is small; the intramedullary needle is long and has edges and corners with different shapes, and is embedded into the medullary cavity, so that firm internal fixation can be achieved, and the occurrence of rotation, lateral movement and angular displacement can be avoided. However, the intramedullary needle is complex to install and complex to operate, and particularly has high difficulty in fixing the main needle, so that if parts are loosened, the intramedullary needle can damage a human body and needs to be operated again, and the intramedullary needle has the risk of secondary injury.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the embodiment of the utility model provides an intramedullary needle.

According to the utility model discloses include:

the main needle comprises a needle rod, a fixing hole penetrating through the needle rod is formed in the needle rod, a clamping column is arranged in the fixing hole, and the fixing hole is provided with an inlet and an outlet;

the power rod comprises an insertion end and a fixed end which are opposite in the length direction, a clamping groove which extends along the axial direction of the power rod is arranged on the outer wall surface of one part of the power rod, the end part, close to the insertion end, of the clamping groove is opened so as to form an opened end, the other end of the clamping groove is a closed end, the insertion end of the power rod penetrates through the inlet of the fixed hole and extends out of the needle rod, at least one part of the clamping groove is matched in the fixed hole, the clamping column is clamped in the clamping groove, the clamping column is in stop fit with the side wall surface of the clamping groove so as to stop and limit the power rod, and the clamping column is in stop fit with the closed end of the clamping groove so as to prevent the whole power rod from penetrating out of the fixed hole; and

the anti-rotation screw penetrates through the main needle, and an included angle is formed between the axis of the anti-rotation screw and the axis of the power rod.

Therefore, the intramedullary needle according to the embodiment of the present invention has the advantages of facilitating the position limitation and installation of the power rod, and preventing the intramedullary needle (especially the power rod) from rotating, thereby preventing the intramedullary needle from hurting the human body.

In some embodiments, the anti-rotation screw includes first and second ends opposite in a lengthwise direction thereof, the first end of the anti-rotation screw passing through the entrance of the fixing hole and protruding out of the needle shaft, and the second end of the anti-rotation screw and a portion of the power rod located in the fixing hole are detachably connected.

In some embodiments, the power rod is provided with a mounting hole penetrating through the power rod, the axis of the mounting hole intersects with the axis of the power rod, the wall surface of the mounting hole is provided with threads, and the anti-rotation screw is in threaded connection with the mounting hole.

In some embodiments, the power rod is provided with a mounting groove, the extending direction of the mounting groove intersects with the extending direction of the power rod, the wall surface of the mounting groove is formed with a thread matched with the anti-rotation screw, and the anti-rotation screw is in threaded connection with the mounting groove.

In some embodiments, the anti-rotation screw includes a limiting section, a threaded section and an insertion section, which are connected in sequence, in a direction adjacent to the first end portion, the first end portion is located on the insertion section, the diameter of the limiting section is greater than that of the threaded section, and the threaded section is in threaded connection with the mounting hole.

In some embodiments, the anti-rotation screw further comprises a reducer section located between the threaded section and the insertion section, the threaded section having a diameter greater than a diameter of the reducer section, a portion of the reducer section decreasing in diameter in a direction adjacent the insertion section, the portion of the reducer section adjacent the insertion section relative to a remainder of the reducer section.

In some embodiments, the outlet of the fixation hole is larger than the inlet of the fixation hole.

In some embodiments, the clamping groove is provided in plurality, and the plurality of clamping grooves are uniformly distributed along the circumferential direction of the power rod.

In some embodiments, there are two of the clamping grooves, and the two clamping grooves are symmetrically arranged relative to the outlet of the mounting hole.

In some embodiments, the closed end of the card slot is provided with an inclined surface, the inclined surface is arranged obliquely upwards towards the direction of the open end of the card slot, and the inclined surface is connected with the side wall surface of the card slot and the bottom surface of the card slot.

Drawings

Fig. 1 is a schematic view of an intramedullary needle according to an embodiment of the present invention.

Fig. 2 is a schematic view of a power wand according to an embodiment of the present invention.

Fig. 3 is a schematic view of a power wand according to an embodiment of the present invention.

Fig. 4 is a schematic view of a power wand according to an embodiment of the present invention.

Fig. 5 is a schematic view of a rotation prevention screw according to an embodiment of the present invention.

Fig. 6 is a schematic view of a primary needle inlet according to an embodiment of the present invention.

Fig. 7 is a schematic view of a primary needle outlet according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

An intramedullary needle 1000 according to an embodiment of the present invention is described below with reference to the drawings. As shown in fig. 1 to 7, an intramedullary needle 1000 according to an embodiment of the present invention includes a main needle 100, a power rod 200, and an anti-rotation screw 300.

The main needle 100 includes a needle shaft 101, a fixing hole 102 is formed through the needle shaft 101, a locking post 103 is provided in the fixing hole 102, and the fixing hole 102 has an inlet and an outlet. For example, the fixation hole 102 may extend through the needle shaft 101 in a known manner, i.e. the fixation hole 102 may be known.

The power rod 200 comprises an insertion end 201 and a fixed end 202 which are opposite in the length direction, a clamping groove 203 which extends along the axial direction of the power rod 200 is arranged on the outer wall surface of one part of the power rod 200, the end of the clamping groove 203 adjacent to the insertion end 201 is opened so as to form an open end, and the other end of the clamping groove 203 is a closed end. The insertion end 201 of the power rod 200 passes through the entrance of the fixing hole 102 and protrudes out of the needle shaft 101, i.e., the insertion end 201 of the power rod 200 passes through the fixing hole 102 from the entrance of the fixing hole 102. At least a part of the card slot 203 is matched in the fixing hole 102, the card column 103 is clamped in the card slot 203, and at least a part of the card column 103 is positioned in the card slot 203. The clamping column 103 is in stop fit with the side wall surface at the closed end of the clamping groove 203 so as to stop and limit the rotation of the power rod 200, and the clamping column 103 is in stop fit with the closed end of the clamping groove 203 so as to prevent the power rod 200 from integrally penetrating out of the fixing hole.

The anti-rotation screw 300 passes through the main needle 100, and the axis of the anti-rotation screw 300 forms an included angle with the axis of the power rod 200.

According to the utility model discloses intramedullary needle 1000 is equipped with along its axially extended draw-in groove 203 on the partial outer wall of power stick 200 through be equipped with card post 103 in fixed orifices 102, and at least partly cooperation of draw-in groove 203 is in fixed orifices 102, and card post 103 card goes into draw-in groove 203, and at least a part of card post 103 is located draw-in groove 203. Therefore, when the insertion end 201 of the power rod 200 passes through the needle rod 101 from the inlet of the fixing hole 102, the locking groove 203 can be matched with the locking column 103, and the locking column 103 is matched with the side wall surface of the closed end of the locking groove 203 in a stopping manner so as to stop the rotation of the power rod 200, that is, the locking column 103 can stop the power rod 200, so that the power rod 200 is stopped, and the power rod 200 is conveniently installed. So that the fixed end 202 of the power rod 200 cannot pass through the outlet of the fixing hole 102 so that the power rod 200 is located at a proper fixing position. The side wall surfaces of the clamping posts 103 and the clamping grooves 203 are matched, so that the power rod 200 cannot rotate in the fixing hole 102, and the human body is prevented from being damaged due to the fact that the power rod 200 rotates in the human body.

The axis of the anti-rotation screw 300 is at an angle to the axis of the power rod 200. That is, the axis of the anti-rotation screw 300 is not parallel to the axis of the power bar 200, e.g., in the same plane, the axis of the anti-rotation screw 300 intersects the axis of the power bar 200.

Therefore, the intramedullary needle 1000 according to the embodiment of the present invention has advantages of facilitating the position limitation and installation of the power rod 200, and preventing the intramedullary needle 1000 (particularly, the power rod 200) from rotating, thereby preventing the intramedullary needle 1000 from injuring the human body.

As shown in fig. 5, in some embodiments, anti-rotation screw 300 includes first and

second ends

301 and 302 opposite in a length direction thereof. Wherein the first end 301 of the anti-rotation screw 300 passes through the needle shaft 101 from the entrance of the fixing hole 102 and protrudes out, so that the first end 301 of the anti-rotation screw 300 protrudes out of the fixing hole 102, thereby bringing at least a portion of the anti-rotation screw 300 into contact with the fixing hole 102. The anti-rotation screw 300 passes through the needle shaft 101, that is, the axis of the anti-rotation screw 300 intersects with at least a portion of the main needle 100 (the portion of the needle shaft 101 where the fixing hole 102 is located). I.e., the axis of at least a portion of the primary needle 100, the axis of the power rod 200, and the axis of the anti-rotation screw 300 intersect (are not parallel).

The second end 302 of the anti-rotation screw 300 is detachably connected with the portion of the power rod 200 located in the fixing hole 102, that is, the second end 302 of the anti-rotation screw 300 is connected with the portion of the power rod 200 located in the fixing hole 102 when the intramedullary needle 1000 is installed in the human body. That is, the anti-rotation screw 300, the power rod 200 and the main needle 100 are connected to each other, so that the main needle 100, the power rod 200 and the anti-rotation screw 300 can be stably maintained when they are engaged, and any one of them is prevented from rotating. Thereby preventing any one of the main needle 100, the power rod 200 and the anti-rotation screw 300 from injuring a human body due to the rotation.

In some embodiments, the power rod 200 is provided with a mounting hole 204 therethrough, and an axis of the mounting hole 204 intersects an axis of the power rod 200. So that the axis of the anti-rotation screw 300 installed in the installation hole 204 intersects with the axis of the power rod 200, so that the intramedullary needle 1000 is more stable without injuring the human body.

The wall surface of the mounting hole 204 is formed with threads, and the anti-rotation screw 300 is screw-coupled to the mounting hole 204 so that the anti-rotation screw 300 is detachably coupled to the power rod 200. Specifically, the second end 302 of the anti-rotation screw 300 is threadedly coupled to the mounting hole 204 of the power rod 200.

Alternatively, the mounting hole 204 penetrates the power rod 200 from the end surface of the fixed end 202 of the power rod 200, that is, one end of the mounting hole 204 opens on the end surface of the fixed end 202.

The first end 301 of the anti-rotation screw 300 passes through the needle shaft 101 from the entrance of the fixing hole 102, and the first end 301 of the anti-rotation screw 300 passes through the power rod 200 from the mounting hole 204 on the end surface of the fixing end 202. The axis of the anti-rotation screw 300 intersects the axis of the power rod 200, so that the anti-rotation screw 300 and the power rod 200 form a snap that can be snapped into the fixing hole 102 when the anti-rotation screw 300 is screwed into the power rod 200 and is in the engaged position. The distance between the anti-rotation screw 300 and the jaw of the power rod 200 in the direction away from the outlet of the fixing hole 102 is gradually increased to form an enlarged portion, so that the jaw of the anti-rotation screw 300 and the power rod 200 cannot move in the direction adjacent to the inlet of the fixing hole 102, and meanwhile, the clamping column 103 and the clamping groove 203 are matched to prevent the power rod 200 from moving in the direction away from the inlet of the fixing hole 102. That is, the screw 300 cannot move on the main needle 100 when engaged with the power rod 200, and the engagement of the locking pin 103 with the locking groove 203 prevents the screw 300 from rotating on the main needle 100 when engaged with the power rod 200. So that the main needle 100, the power rod 200 and the anti-rotation screw 300 are fixed to each other, that is, the respective parts of the intramedullary needle 1000 cannot move, thereby reducing the injury to the human body.

In some embodiments, the power rod 200 is provided with a mounting groove, and the extending direction of the mounting groove intersects with the extending direction of the power rod 200. So that the axis of the anti-rotation screw 300 installed in the installation groove intersects with the axis of the power rod 200, so that the intramedullary needle 1000 is more stable without injuring the human body.

The wall surface of the mounting groove is formed with a thread to be engaged with the rotation preventing screw 300, for example, the mounting groove has an arc-shaped section. The anti-rotation screw 300 is screw-coupled with the mounting groove so that the anti-rotation screw 300 is detachably coupled with the power bar 200. Specifically, the second end 302 of the anti-rotation screw 300 is threadedly coupled to the mounting slot of the power rod 200. When the anti-rotation screw 300 is in threaded connection with the mounting groove and is in a matching position, the anti-rotation screw 300 and the power rod 200 can form a clamping piece which can be clamped in the fixing hole 102. Thereby fixing the main needle 100, the power rod 200 and the anti-rotation screw 300 to each other. Thereby making each part in the intramedullary needle 1000 immovable and reducing the injury to the human body.

As shown in fig. 5, in some embodiments, the anti-rotation screw 300 includes a stop segment 310, a threaded segment 320, and an insertion segment 340 connected in series in a direction adjacent to the first end 301.

The first end 301 is located on the insertion section 340, and the threaded section 320 is in threaded connection with the mounting hole 204, i.e. the diameter of the threaded section 320 is adapted to the bore diameter of the mounting hole 204. The diameter of the limiting section 310 is larger than that of the threaded section 320, so that the limiting section 310 cannot enter the threaded wall surface in the mounting hole 204, and the anti-rotation screw 300 is limited, so that the anti-rotation screw 300 is in a proper assembly position.

As shown in fig. 5, in some embodiments, anti-rotation screw 300 further includes a tapered section 330, tapered section 330 being located between threaded section 320 and insertion section 340.

The diameter of the threaded section 320 is larger than that of the reducing section 330, and the diameter of the reducing section 330 is smaller, so that the diameter of the part where the anti-rotation screw 300 is matched with the outlet of the fixing hole 102 is reduced, the anti-rotation screw 300 has certain bending elasticity, and certain elastic pressing force is provided when the reducing section 330 is matched with the outlet of the fixing hole 102.

A portion of the variable diameter section 330 decreases in diameter in a direction adjacent to the insertion section 340, and the portion of the variable diameter section 330 is adjacent to the insertion section 340 with respect to the remaining portion of the variable diameter section 330. The diameter reduction of the portion of the variable diameter section 330 can absorb the size error, so that the variable diameter section 330 can conveniently penetrate out of the mounting hole 204, the variable diameter section 330 and the insertion section 340 can conveniently form a step and can be attached (clamped) with the outlet of the fixing hole 102, and the assembly difficulty is reduced.

In addition, after the anti-rotation screw 300 (the reducing section 330) deforms, the generated radial deformation force can act on the threaded connection part of the anti-rotation screw 300 and the power rod 200 in reverse, and pressing force is provided for the threaded connection part, so that the anti-rotation screw is connected with the power rod 200 more tightly, the connection stability can be ensured without the labor of operators for screwing, and the assembly difficulty is further reduced.

The installation process of the intramedullary needle 1000 will be briefly described below by taking an example in which the outlet of the fixing hole 102 is located at the right end of the fixing hole 102, the insertion end 201 is located at the right end of the power rod 200, and the first end 301 is located at the right end of the anti-rotation screw 300.

The insertion end 201 of the power rod 200 is inserted into the fixing hole 102 moving rightward from the entrance (left side) of the fixing hole 102 and causes the catching groove 203 of the power rod 200 to engage with the catching column 103 of the fixing hole 102. The catch posts 103 engage the side wall surfaces of the catch grooves 203 so that the power bar 200 cannot rotate. The locking column 103 stops the closed end of the locking groove 203, so that the power rod 200 is limited, and the power rod 200 is prevented from moving rightwards, so that the power rod 200 is in the assembling position.

The anti-rotation screw 300 is inserted into the mounting hole 204 from the entrance (left side) of the mounting hole 204 to the right, and when the threaded section 320 approaches the threaded wall surface of the mounting hole 204, the anti-rotation screw 300 is rotated by a tool so that the threaded section 320 is threadedly coupled with the mounting hole 204. The installation of the anti-rotation screw 300 is completed when the stop segment 310 approaches the wall surface having the threads in the installation hole 204. During the installation process, the insertion section 340 first passes through the outlet of the installation hole 204 and then continues to move to the right, and finally passes through the outlet of the fixing hole 102, i.e., the anti-rotation screw 300, to reach the fitting position. Therefore, the main needle 100, the power rod 200 and the anti-rotation screw 300 can be kept stable, the power rod 200 and the anti-rotation screw 300 cannot move left and right, and any one of the three is prevented from rotating. Thereby making each part in the intramedullary needle 1000 immovable and reducing the injury to the human body.

As shown in fig. 5, in some embodiments, the stop segment 310 and the threaded segment 320 are connected by a first neck-in groove 311, the groove bottom of the first neck-in groove 311 is located inside the threaded segment 320, the threaded segment 320 and the reducing segment 330 are connected by a second neck-in groove 321, and the groove bottom of the second neck-in groove 321 is located inside the reducing segment 330. The first neck groove 311 and the second neck groove 321 facilitate the threaded section 320 to enter and exit the mounting hole 204, and reduce the assembly difficulty of the anti-rotation screw 300.

As shown in fig. 5, in some embodiments, the insertion section 340 is provided with insertion threads 341, and the insertion threads 341 are provided at the first end 301. The insertion thread 341 facilitates rotation of the insertion section 340 into the bone of the human body.

As shown in fig. 6 and 7, in some embodiments, the outlet of the fixation hole 102 is larger than the inlet of the fixation hole 102. Thereby increasing the stability of the power rod 200 and the anti-rotation screw 300 within the fixing hole 102 and preventing the power rod 200 and the anti-rotation screw 300 from coming out of the inlet of the fixing hole 102 when they are engaged.

In some embodiments, the plurality of slots 203 is provided, and the plurality of slots 203 are uniformly distributed along the circumference of the power rod 200. The clamping columns 103 in multiple directions are matched with the clamping grooves 203 conveniently, so that the power rod is stressed uniformly.

In some embodiments, there are two card slots 203, and the two card slots 203 are symmetrically arranged with respect to the outlet of the mounting hole 204. Therefore, the structure of the clamping groove 203 is more balanced, and the clamping column 103 is convenient to limit the power rod 200.

In some embodiments, the axis of the anti-rotation screw 300 forms a first angle with the axis of the power bar 200, the first angle being 7.5 °. The angle of the first included angle is small, so that the area occupied by the anti-rotation screw 300 and the power rod 200 can be reduced, and the installation of the anti-rotation screw 300 and the power rod 200 is facilitated.

As shown in fig. 4, in some embodiments, the closed end of the card slot 203 is provided with an inclined surface, the inclined surface is arranged obliquely upward toward the open end of the card slot 203, and a side wall surface of the inclined card slot 203 is connected with a bottom surface of the card slot 203. Therefore, when the clamping column 103 limits the power rod 200, the bottom end of the clamping column 103 is convenient to prop against the inclined plane of the closed end of the clamping groove 203, so that the clamping column 103 is convenient to clamp the clamping groove 203, and the limitation on the power rod 200 is completed.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. An intramedullary needle, comprising:

2. The intramedullary needle of claim 1, wherein the anti-rotation screw includes first and second ends opposite in a lengthwise direction thereof, the first end of the anti-rotation screw passing through the inlet of the fixation hole and protruding out of the needle shaft, the second end of the anti-rotation screw being detachably connected to a portion of the power rod located in the fixation hole.

3. The intramedullary needle according to claim 2, wherein the power rod is provided with a mounting hole penetrating therethrough, an axis of the mounting hole intersects with an axis of the power rod, a wall surface of the mounting hole is formed with a thread, and the anti-rotation screw is in threaded connection with the mounting hole.

4. The intramedullary needle according to claim 2, wherein a mounting groove is provided on the power rod, the extending direction of the mounting groove intersects with the extending direction of the power rod, a thread engaged with the rotation-preventing screw is formed on the wall surface of the mounting groove, and the rotation-preventing screw is in threaded connection with the mounting groove.

5. The intramedullary needle of claim 3, wherein the anti-rotation screw comprises a limiting section, a threaded section and an insertion section which are connected in sequence in a direction adjacent to the first end, the first end is located on the insertion section, the diameter of the limiting section is larger than that of the threaded section, and the threaded section is in threaded connection with the mounting hole.

6. The intramedullary needle of claim 5, wherein the anti-rotation screw further comprises a tapered section between the threaded section and the insertion section, the threaded section having a diameter greater than a diameter of the tapered section, a portion of the tapered section decreasing in diameter in a direction adjacent the insertion section, the portion of the tapered section adjacent the insertion section relative to a remainder of the tapered section.

7. The intramedullary needle of claim 2, wherein the outlet of the fixation hole is larger than the inlet of the fixation hole.

8. The intramedullary needle of claim 2, wherein the plurality of locking grooves are evenly distributed along a circumferential direction of the power rod.

9. The intramedullary needle according to claim 2, wherein there are two of the catching grooves, and the two catching grooves are symmetrically arranged with respect to an outlet of the mounting hole.

10. The intramedullary needle according to claim 2, wherein the closed end of the neck is provided with a slope which is inclined upward in a direction toward the open end of the neck, the slope connecting the side wall surface of the neck and a bottom surface of the neck.