CN209884292U - Intramedullary nail - Google Patents

Abstract

The utility model provides an intramedullary nail, which belongs to the field of medical instruments and comprises a nail body, wherein the nail body comprises a guide section and a locking section which are connected, and the outer diameter of the locking section is gradually increased from an implanting end of the nail body to the tail end of the nail body; the peripheral surface of the locking section is provided with an anti-rotation thread, and the thread pitch of the anti-rotation thread is gradually reduced from the implantation end to the tail end. The nail body self produces the pressurization effect to fusing the position through gradual change screw thread, the utility model discloses an intramedullary nail is high in the joint degree of fusion when using, and the operation success rate is high.

Description

Intramedullary nail

Technical Field

The utility model relates to the field of medical equipment, particularly, relate to an intramedullary nail.

Background

When the walking function is affected by the ischemic necrosis of the talus, the traumatic arthritis of the ankle joint or the subtalar joint or the pain, the tibiotalar joint fusion is needed, three methods are adopted: firstly, fixing by a hollow nail, secondly, fixing by an external fixing frame, and thirdly, fixing by an ankle joint fusion dissection plate.

The inventor finds in research that the existing hollow nail for treating the disease has at least the following disadvantages:

the fusion and fixation between joints is unstable, the postoperative functional exercise is poor, and the soft tissue injury is serious.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an intramedullary nail, the intramedullary nail is implanted in the joint back firm reliable with the cooperation of joint, and articular fusion degree is high, and the success rate of operation is high, and the recovered required time of patient shortens.

The utility model discloses an adopt following technical scheme to realize:

based on the above purpose, the embodiment of the utility model provides an intramedullary nail, which comprises a nail body, wherein the nail body comprises a guide section and a locking section which are connected, and the outer diameter of the locking section is gradually increased from an implantation end of the nail body to the tail end of the nail body; the peripheral surface of the locking section is provided with an anti-rotation thread, and the thread pitch of the anti-rotation thread is gradually reduced from the implantation end to the tail end.

Optionally, the intramedullary nail further comprises an anti-rotation element; the nail body is provided with a sliding channel and a guide channel communicated with the sliding channel, the length direction of the sliding channel extends along the length direction of the nail body, an included angle is formed between the guide channel and the sliding channel, and one end of the guide channel, which is far away from the sliding channel, extends to the outer wall of the nail body; the anti-rotation piece is in sliding fit with the sliding channel along the length direction of the sliding channel, and one end of the anti-rotation piece can extend out of the guide channel.

Optionally, the rotation preventing member has a first side and a second side opposite to each other, and when one end of the rotation preventing member extends out of the guide channel, the first side partially fits on the inner wall of the sliding channel, and the second side partially fits on the inner wall of the guide channel.

Optionally, the end of the rotation preventing member extending out of the guide channel is provided with a guide slope.

Optionally, the number of the anti-rotation pieces is at least two, and the at least two anti-rotation pieces are arranged at intervals along the circumferential direction of the nail body.

Optionally, the intramedullary nail further comprises a pushing member, wherein the pushing member is mounted in the sliding channel and used for pushing the rotation prevention member and enabling one end of the rotation prevention member to extend out of the guide channel.

Optionally, the pushing member is screwed in the sliding channel, and when the pushing member rotates relative to the sliding channel, the anti-rotation member can be pushed to slide relative to the nail body and extend out of the guide channel.

Optionally, the pushing member comprises a locking rod and a pushing rod, the locking rod is screwed in the sliding channel, the pushing rod is located between the locking rod and the anti-rotation member, one end of the pushing rod is rotatably connected with the locking rod, and the pushing rod is in circumferential limit connection with the nail body; the other end of the catch bar is rotatably connected with the anti-rotation piece, and the anti-rotation piece is circumferentially limited and connected with the nail body.

Optionally, a limiting groove communicated with the sliding channel is arranged in the nail body, and the length direction of the limiting groove extends along the length direction of the sliding channel; the outer peripheral surface of the locking rod is provided with a first clamping bulge, a second clamping groove and a first limiting bulge, wherein the first limiting bulge is clamped in the limiting groove and is in sliding fit with the limiting groove; the anti-rotation piece is provided with a second clamping protrusion and a second limiting protrusion which is clamped in the limiting groove and is in sliding fit with the limiting groove, and the second clamping protrusion is clamped in the second clamping groove and is in rotating fit with the second clamping groove.

Optionally, the intramedullary nail further comprises a locking nail, the locking nail is screwed on the nail body, and an included angle is formed between the locking nail and the nail body.

Compared with the prior art, the intramedullary nail provided by the preferred embodiment of the present invention has the following beneficial effects:

the utility model provides an intramedullary nail, including the nail body, the nail body is including continuous direction section and locking section, and the locking section is the reducing section, and the external diameter of locking section changes gradually along its length direction, and the external diameter of locking section is held to the tail end crescent of nail body by implanting of nail body, and simultaneously, the outer peripheral face of locking section is provided with the anti-thread of revolving of pitch gradual change, and the pitch of preventing revolving the screw thread is held to the tail end by implanting and is reduced gradually. After the nail body is implanted into the joint to be fixed, the nail body is provided with the anti-rotation thread structure with gradually changed thread pitch, so that the nail body is effectively prevented from rotating in the calcaneus body, the overall stability is improved, the nail body is effectively prevented from being withdrawn, the fusion effect is improved, and the success rate of the operation is improved. And the nail body implants the back, because the diameter of tail end is great, can implant the nail body completely in the bone and make tail end and bone face parallel and level, the nail body does not have the part that exposes, reduces the irritation to sole soft tissue. Meanwhile, the locking section adopts a structure with gradually changed outer diameter, and the anti-rotation threads with gradually changed thread pitches on the locking section are combined, so that the nail body is firmly combined with the bone body after being implanted into the bone body, the anti-rotation threads do not need to be arranged on the outer peripheral surface of the whole nail body, the processing difficulty of the nail body is reduced, the difficulty of screwing the nail body into the joint in the operation process is also reduced, and the success rate of the operation is improved.

Furthermore, the utility model discloses an in the embodiment, be provided with on the nail body with nail body complex prevent revolving the piece, the nail body implants internal back, further improves the integration degree of nail body and joint, improves the operation success rate. The anti-rotation piece retracts into the nail body in the process of implanting the nail body, implantation operation of the nail body is not easily affected, after the nail body is implanted, the end part of the anti-rotation piece extends out of the nail body, and the extending part of the anti-rotation piece is abutted against the medullary cavity, so that an anti-rotation effect is achieved.

Furthermore, in the embodiment of the utility model, after the one end of preventing revolving the piece stretched out the direction passageway, the first side of preventing revolving the piece and sliding channel's inner wall butt, the second side of preventing revolving the piece and the inner wall butt of direction passageway, the area of contact of preventing revolving the piece and nailing body is big, prevents revolving the position of piece firmly, is difficult for shifting, uses safe and reliable more.

Furthermore, in the embodiment of the utility model provides an in, prevent that the piece is used for stretching out guide channel's a terminal surface to have the direction inclined plane soon, it is more convenient that the piece stretches out guide channel soon, is difficult for appearing interfering the dead condition of card.

Furthermore, in the embodiment of the utility model, impeller and slip passageway spiro union, the convenient reliable of the operation mode of impeller is convenient for promote to prevent revolving the piece and make to prevent revolving the piece and stretch out from the tip of direction passageway.

Furthermore, in the embodiment of the utility model, the impeller includes check lock lever and catch bar, check lock lever and slip channel spiro union, the check lock lever rotates with the one end of catch bar to be connected, and catch bar and nail body circumference spacing connection, the one end of catch bar rotates with the tip of preventing revolving the piece to be connected, prevent revolving a piece and nail body circumference spacing connection, through rotating the check lock lever, the check lock lever drives the catch bar and slides in slip channel, and the catch bar can not rotate for the nail body, and simultaneously, the catch bar drives when sliding prevents revolving the piece and slides in slip channel, and prevent revolving the piece can not rotate for the nail body, it is inseparabler with the cooperation of direction passageway to prevent revolving the piece, be difficult for the dislocation, it directly stretches out from the direction passageway to be convenient for prevent revolving the piece, prevent revolving the piece after stretching out, the check lock lever has self-locking function, prevent revolving the piece and remain throughout in the position of. Locking lever, catch bar and prevent revolving an independent processing, the reassembling is got up, and the manufacturing and processing of being convenient for, and the intensity of single part is higher, is difficult for taking place deformation in the use, prevents revolving a difficult deformation, prevents revolving effectually. In addition, the locking lever is reversed, so that the anti-rotation piece can be retracted into the nail body, and the operation is flexible and convenient.

In addition, in the embodiment of the present invention, after the nail body is implanted into the body, a locking nail is inserted into the position of the nail body near the tail end of the nail body, so as to further improve the firmness of the intramedullary nail.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without creative efforts, and the protection scope of the present invention also belongs to the protection scope of the present invention.

FIG. 1 is an exploded view of the intramedullary nail provided in this embodiment;

FIG. 2 is a cross-sectional view of an exploded structure of the intramedullary nail provided in the present embodiment;

FIG. 3 is a cross-sectional structural view of the intramedullary nail provided in the present embodiment;

fig. 4 is an exploded schematic structural view of the nail body provided in this embodiment;

FIG. 5 is an enlarged, fragmentary, schematic view of FIG. 4;

FIG. 6 is a schematic structural view of a pushing member provided in the present embodiment;

fig. 7 is a schematic structural view of the rotation preventing member provided in this embodiment.

Icon: 01-intramedullary nail; 001-nail body; 100-a guide section; 110-a locking section; 111-anti-rotation threads; 120-a sliding channel; 121-first section; 122-a second segment; 130-a guide channel; 140-a limiting groove; 150-locking channel; 160-internal thread section; 170-bayonet; 180-implanted end; 190-tail end; 002-a pusher; 200-a locking lever; 201-a first card slot; 210-a push rod; 211-a first snap-in projection; 2110-first connection segment; 2111-first card connection section; 212-a second card slot; 213-a first limit projection; 003-rotation preventing parts; 300-a guide slope; 310-a first side; 320-a second side; 330-a second clamping bulge; 331-a second connection segment; 332-a second clamping section; 340-a second limit projection; 004-a plugging cap; 005-locking pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 4, the present embodiment provides an intramedullary nail 01, which includes a nail body 001, wherein the nail body 001 includes a guide section 100 and a locking section 110 connected to each other, and an outer diameter of the locking section 110 gradually increases from an implantation end 180 of the nail body 001 to a tail end 190 of the nail body 001; the locking section 110 has an anti-rotation thread 111 on its outer circumference, and the pitch of the anti-rotation thread 111 decreases from the insertion end 180 to the tail end 190.

The intramedullary nail 01 provided by the embodiment is implanted into the joint to be fixed, and the nail body 001 is effectively prevented from rotating in the calcaneus body due to the fact that the nail body 001 is provided with the anti-rotation thread 111 structure with gradually changed thread pitch, so that the overall stability is improved, the nail body 001 is effectively prevented from retreating, the fusion effect is improved, and the success rate of the operation is improved. And the nail body 001 is implanted the back, because the diameter of tail end 190 is great, can implant nail body 001 completely in the bone and make tail end 190 and bone face parallel and level, nail body 001 does not have the part that exposes, reduces the irritation to sole soft tissue. Meanwhile, the locking section 110 is of a structure with gradually changed outer diameter, and the anti-rotation threads 111 with gradually changed thread pitches on the locking section 110 are combined, so that the nail body 001 is firmly implanted into a bone and combined with the bone, the anti-rotation threads 111 do not need to be arranged on the outer peripheral surface of the whole nail body 001, the processing difficulty of the nail body 001 is reduced, the difficulty of screwing the nail body 001 into a joint in the operation process is also reduced, and the success rate of the operation is improved.

Referring to fig. 4, in the present embodiment, optionally, the length and the outer diameter of the nail body 001 are set as required, which is not specifically described herein. The nail body 001 comprises a guide section 100 and a locking section 110, the guide section 100 can be but is not limited to be cylindrical, one end of the guide section 100, which is far away from the locking section 110, is an implanting end 180, and the end face where the implanting end 180 is located is a conical surface, so that the nail body 001 can be conveniently implanted into a joint in an operation process. The end of the locking section 110 far away from the guide section 100 is a tail end 190, the tail end 190 is provided with a bayonet 170 for being in clamping fit with an outer bracket, the outer bracket is inserted into the bayonet 170, and the outer bracket rotates to drive the locking section 110 to rotate, so that the nail body 001 is implanted into a body.

Referring to fig. 4, optionally, the nail body 001 has a sliding channel 120, a guiding channel 130 communicating with the sliding channel 120, and a locking channel 150 communicating with the sliding channel 120. The shape of the slide channel 120 is, for example, but not limited to, a cylinder, in other words, the cross-sectional shape of the slide channel 120 is, for example, but not limited to, a circle. The length direction of the sliding channel 120 is parallel to the length direction of the nail body 001, optionally, the sliding channel 120 is coaxial with the nail body 001, obviously, in other embodiments, the length direction of the sliding channel 120 may form an angle with the length direction of the nail body 001, and the sliding channel 120 and the nail body 001 may not be coaxially disposed. Further, the slide channel 120 includes a first section 121 and a second section 122 connected, and the diameter of the first section 121 is smaller than that of the second section 122. Referring to fig. 5, the end of the first section 121 far away from the second section 122 extends to the end face of the implantation end 180 of the nail body 001, and the end of the second section 122 far away from the first section 121 extends to the end face of the tail end 190 of the nail body 001, and the part of the nail body 001 near the tail end 190 has an internal thread section 160. Further, a limiting groove 140 is arranged on the inner wall of the sliding channel 120, the limiting groove 140 may be a groove with an arc-shaped cross section, and the number of the limiting grooves 140 is set as required.

The guide channel 130 is, for example, but not limited to, a strip channel, one end of the guide channel 130 is communicated with the connection position of the first section 121 and the second section 122, the other end of the guide channel 130 extends to the outer peripheral surface of the guide section 100, and the guide channel 130 forms an angle with the first section 121. Optionally, the number of the guide channels 130 is at least two, and the at least two guide channels 130 are uniformly arranged at intervals along the circumferential direction of the nail body 001, for example, in this embodiment, the number of the guide channels 130 is two, the two guide channels 130 are located on the same diameter of the first section 121 and are symmetrically arranged, it should be noted that the number of the limiting grooves 140 is two, and the limiting grooves 140 correspond to the guide channels 130 one by one. Obviously, in other embodiments, the number of guide channels 130 may be three, four, etc., and the number of limiting grooves 140 may be changed accordingly.

A locking channel 150 is in communication with the second section 122, the locking channel 150 being, for example and without limitation, a threaded hole. The locking channel 150 is angled with respect to the second section 122.

Referring to fig. 6, in the present embodiment, optionally, the intramedullary nail 01 further includes a pushing member 002, the pushing member 002 includes a locking rod 200 and a pushing rod 210, the locking rod 200 may be, but is not limited to, a cylindrical rod, the locking rod 200 has an external thread, and one end of the locking rod 200 is provided with a straight groove or a cross-shaped groove for inserting a screwdriver. The outer peripheral surface of the locking rod 200 is provided with a first clamping groove 201, the groove depth direction of the first clamping groove 201 extends along the radial direction of the locking rod 200, the first clamping groove 201 is far away from the end where the straight groove or the cross groove is located, and the first clamping groove 201 is, for example, but not limited to, an annular groove. The pushing member 002 may be, but is not limited to, a cylindrical rod, one end of the pushing member 002 is provided with a first clamping protrusion 211, the first clamping protrusion 211 includes a first connection section 2110 protruding in a length direction of the pushing member 002 and a first clamping section 2111 connected to the first connection section 2110 and protruding inward in a radial direction of the pushing member 002, and the first clamping section 2111 is spaced from an end surface of the pushing member 002. The end of the pushing element 002 away from the first clamping protrusion 211 is provided with a second clamping groove 212, the groove depth direction of the second clamping groove 212 extends along the radial direction of the pushing rod 210, and the second clamping groove 212 is, for example, but not limited to, an annular groove. The outer peripheral surface of the push rod 210 is provided with a first limiting protrusion 213, the first limiting protrusion 213 may be in a strip shape, and the length direction of the first limiting protrusion 213 is parallel to the length direction of the pushing member 002.

It should be noted that, in the present embodiment, the pushing rod 210, the first catching protrusion 211, and the first limiting protrusion 213 may be integrally formed.

It should be noted that, in other embodiments, the first engaging groove 201 may not be an annular groove, the number of the first engaging grooves 201 may be multiple, and the multiple first engaging grooves 201 are arranged at intervals along the circumferential direction of the locking rod 200 and are matched with the first engaging protrusions 211 one by one. Obviously, the second locking groove 212 may not be an annular groove, the number of the second locking grooves 212 may be multiple, and a plurality of the second locking grooves 212 are arranged at intervals along the circumferential direction of the locking rod 200.

Referring to fig. 7, in this embodiment, the intramedullary nail 01 may further include a rotation preventing member 003, the rotation preventing member 003 may be an elastic member, and may be elastically deformed under the action of an external force, and after the external force is removed, the rotation preventing member 003 may recover the deformation. The anti-rotation member 003 is, for example but not limited to, a long strip made of titanium alloy, one end of the anti-rotation member 003 is provided with a guide inclined plane 300, the other end of the anti-rotation member 003 is provided with a second clamping protrusion 330, the second clamping protrusion 330 includes a second connecting section 331 and a second clamping section 332 which are connected, the second connecting section 331 protrudes along the length direction of the anti-rotation member 003, the second clamping section 332 protrudes inward along the radial direction of the anti-rotation member 003, and the second clamping section 332 is spaced from the end face of the anti-rotation member 003. Further, the outer wall of the anti-rotation element 003 is provided with a second limiting protrusion 340, the second limiting protrusion 340 may be in a bar shape, and the length direction of the second limiting protrusion 340 extends along the length direction of the anti-rotation element 003. The number of the rotation preventing members 003 is set as required, for example, the number of the rotation preventing members 003 is two in the present embodiment, and obviously, the number of the rotation preventing members 003 is three or four or the like in other embodiments. It should be noted that, in this embodiment, the rotation preventing element 003, the second snapping protrusion 330 and the second limiting protrusion 340 may be integrally formed.

Referring to fig. 1-3, in an alternative embodiment, the intramedullary nail 01 further includes a blocking cap 004 and a locking nail 005, wherein the blocking cap 004 has a straight groove or a cross groove for cooperating with a screwdriver; the locking pin 005 may be, but is not limited to, a screw.

Referring to fig. 1-3, the intramedullary nail 01 of the present embodiment includes a nail body 001, a rotation-preventing element 003, a pushing element 002, a locking nail 005, and a blocking cap 004. Prevent revolving a 003 and be located sliding channel 120 and with sliding channel 120 sliding fit, prevent revolving in the spacing recess 140 of second spacing arch 340 joint in sliding channel 120 on the piece 003, realized promptly preventing revolving a 003 and the spacing connection of circumference of nail body 001, prevent revolving a 003 pole and slide for sliding channel 120 and can not rotate for sliding channel 120 along sliding channel 120's length direction. The pushing element 002 is arranged in the sliding channel 120 and is in sliding fit with the sliding channel 120, and the pushing element 002 is positioned between the rotation preventing piece 003 and the tail end 190 and is used for pushing the rotation preventing piece 003 out of the guide channel 130 or pulling the rotation preventing piece 003 back into the sliding channel 120. After the nail body 001 is implanted, the blocking cap 004 blocks the tail end 190 of the nail body 001 to prevent soft tissues from growing into the sliding channel 120. Then, the locking pin 005 is screw-fixed in the locking passage 150.

Specifically, the locking rod 200, the pushing rod 210 and the rotation preventing piece 003 are sequentially arranged along the tail end 190 towards the direction of the implanting end 180, the locking rod 200 is in threaded connection with the internal thread section 160 in the sliding channel 120, the first clamping section 2111 on the pushing rod 210 is clamped into the first clamping groove 201, optionally, the number of the first clamping sections 2111 is two, correspondingly, the locking rod 200 is provided with two first clamping grooves 201, and the two first clamping sections 2111 are symmetrically arranged and are respectively clamped into one first clamping groove 201. Meanwhile, the push rod 210 is provided with two first limiting protrusions 213 which are symmetrically arranged, correspondingly, the sliding channel 120 is provided with two limiting grooves 140 which are symmetrically arranged, the two first limiting protrusions 213 are respectively clamped into the corresponding limiting grooves 140, and circumferential limiting connection between the push rod 210 and the nail body 001 is achieved, namely the push rod 210 slides relative to the sliding channel 120 along the length direction of the sliding channel 120 and cannot rotate relative to the sliding channel 120. Prevent revolving the quantity of piece 003 and be two, two prevent revolving a 003 symmetry setting, two prevent revolving the spacing arch 340 of second on the piece 003 joint respectively in a spacing recess 140, correspond, have two second draw-in grooves 212 on the catch bar 210, two prevent revolving two second joint sections 332 on the piece 003 joint respectively in the second draw-in groove 212 that corresponds on the catch bar 210. The screwdriver is inserted into the straight groove or the cross groove at the end part of the locking rod 200, the screwdriver is rotated to drive the locking rod 200 to rotate, the locking rod 200 is in threaded connection with the sliding channel 120, the locking rod 200 slides relative to the sliding channel 120 while rotating, and then the pushing rod 210 pushes the anti-rotation piece 003 to slide, because the pushing rod 210 and the anti-rotation piece 003 are in circumferential limited connection with the nail body 001, the anti-rotation piece 003 cannot rotate relative to the nail body 001 in the sliding process, and in the sliding process of the anti-rotation piece 003 from the tail end 190 to the implanting end 180, the connecting position between the guide inclined plane 300 and the first section 121 and the second section 122 is abutted, when the anti-rotation piece 003 is continuously pushed to slide in the sliding channel 120, under the action of the guide inclined plane 300, the anti-rotation piece 003 directly slides into the guide channel 130, and the anti-rotation piece 003 bends outwards in the guide channel 130 and then extends out of the guide channel 130, prevent revolving the simple operation of stretching out of piece 003 reliable, because prevent revolving the piece 003 and stretch out the back and be the form of bending, increased and prevented revolving the structural strength of piece 003, prevent revolving effectually. It should be noted that two anti-rotation members 003 are provided, and correspondingly, two guide channels 130 on the nail body 001 are provided, and since the anti-rotation members 003 cannot rotate relative to the nail body 001, the positions of the anti-rotation members 003 and the guide channels 130 are not easy to be dislocated, so that the anti-rotation members 003 can extend out of the corresponding guide channels 130 conveniently. After the one end of preventing revolving a 003 stretches out guide way 130, the other end of preventing revolving a 003 is located sliding channel 120, and the cooperation of preventing revolving a 003 and nailing body 001 is more firm, prevents revolving the difficult change in position of a 003, prevents revolving effectually. Further, the rotation preventing member 003 has a first side 310 and a second side 320 opposite to each other, and when one end of the rotation preventing member 003 protrudes out of the guide channel 130, the first side 310 partially fits on the inner wall of the sliding channel 120, and the second side 320 partially fits on the inner wall of the guide channel 130. After the anti-rotation piece 003 extends out of the guide channel 130, the contact area with the nail body 001 is large, and the structure of the anti-rotation piece and the nail body is firm and reliable. It should be noted that, the locking lever 200 is connected with the pushing rod 210 in a clamping manner, the pushing rod 210 is connected with the anti-rotation member 003 in a clamping manner, the locking lever 200 is rotated in the opposite direction, and the anti-rotation member 003 can be retracted into the sliding channel 120, so that the nail body 001 can be taken out conveniently.

After the protruding position of the rotation preventing member 003 reaches the set position, the rotation of the lock lever 200 is stopped. Then, the blocking cap 004 is screwed on the tail end 190 of the nail body 001, and the locking nail 005 is screwed in the locking channel 150, so that the surgical implantation of the intramedullary nail 01 is completed.

It should be noted that, a protrusion may be disposed on the locking lever 200, and a groove matched with the protrusion may be disposed on the push rod 210, so as to realize the rotational connection between the locking lever 200 and the push rod 210. Can set up the recess on the catch bar 210, set up on the anti-rotation piece 003 with this recess complex protruding, realize catch bar 210 and anti-rotation piece 003 rotate be connected. Can set up the recess on catch bar 210 and prevent revolving on piece 003, set up in the sliding channel 120 with this recess complex protruding, realize catch bar 210 and sliding channel 120's sliding connection and circumference spacing connection to and realize preventing revolving sliding connection and circumference spacing connection of piece 003 and sliding channel 120.

The intramedullary nail 01 provided in the present embodiment is for example, but not limited to, applied to the fixation of ankle joint. In a specific operation, the nail body 001 is implanted from the sole of the foot of the patient, specifically, inserted from the central position of the calcaneus bone and inserted into the central portions of the talus and tibia.

The intramedullary nail 01 provided by the embodiment can effectively prevent the nail body 001 from rotating in the calcaneus body, increases the overall stability, effectively prevents the nail body 001 from retreating, improves the fusion effect and improves the success rate of the operation.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An intramedullary nail is characterized by comprising a nail body, wherein the nail body comprises a guide section and a locking section which are connected, and the outer diameter of the locking section is gradually increased from an implanting end of the nail body to the tail end of the nail body; the peripheral surface of locking section is equipped with prevents revolving the screw thread, the pitch of preventing revolving the screw thread is by implanting end reduces gradually to the tail end.

2. The intramedullary nail of claim 1, further comprising an anti-rotation element; the nail body is provided with a sliding channel and a guide channel communicated with the sliding channel, the length direction of the sliding channel extends along the length direction of the nail body, an included angle is formed between the guide channel and the sliding channel, and one end of the guide channel, far away from the sliding channel, extends to the outer wall of the nail body; the anti-rotation piece is arranged on the sliding channel and is in sliding fit with the sliding channel along the length direction of the sliding channel, and one end of the anti-rotation piece can extend out of the guide channel.

3. The intramedullary nail of claim 2, wherein the rotation prevention member has first and second opposing sides, the first side partially abutting an inner wall of the sliding channel and the second side partially abutting an inner wall of the guide channel when one end of the rotation prevention member extends out of the guide channel.

4. The intramedullary nail of claim 3, wherein the end of the rotation prevention member for extending out of the guide channel is provided with a guide ramp.

5. The intramedullary nail according to any one of claims 2 to 4, wherein the number of rotation prevention members is provided in at least two, at least two of the rotation prevention members being spaced apart in a circumferential direction of the nail body.

6. The intramedullary nail of any one of claims 2 to 4, further comprising a pushing member mounted within the sliding channel for pushing the rotation prevention member and extending an end of the rotation prevention member out of the guide channel.

7. The intramedullary nail of claim 6, wherein the pushing member is threaded into the sliding channel, the pushing member being capable of pushing the rotation prevention member to slide relative to the nail body and extend out of the guide channel upon rotation relative to the sliding channel.

8. The intramedullary nail of claim 7, wherein the push member includes a locking rod and a push rod, the locking rod is screwed in the sliding channel, the push rod is located between the locking rod and the rotation-preventing member, one end of the push rod is rotatably connected with the locking rod, and the push rod is circumferentially connected with the nail body in a limiting manner; the other end of the pushing rod is rotatably connected with the anti-rotation piece, and the anti-rotation piece is circumferentially and limitedly connected with the nail body.

9. The intramedullary nail of claim 8, wherein a limiting groove is provided inside the nail body and is communicated with the sliding channel, and the length direction of the limiting groove extends along the length direction of the sliding channel; the outer peripheral surface of the locking rod is provided with a first clamping groove, the pushing rod is provided with a first clamping protrusion, a second clamping groove and a first limiting protrusion which is clamped in the limiting groove and is in sliding fit with the limiting groove, and the first clamping protrusion is clamped in the first clamping groove and is in rotating fit with the first clamping groove; prevent revolving the piece have the protruding and joint of second joint in the spacing groove and with spacing groove sliding fit's the spacing arch of second, the protruding joint of second joint in the second draw-in groove and with second draw-in groove normal running fit.

10. The intramedullary nail of claim 1, further comprising a locking nail threaded to the nail body, the locking nail having an angle with the nail body.

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