CN115607253B

CN115607253B - Internal fixing screw for femoral neck

Info

Publication number: CN115607253B
Application number: CN202211589089.0A
Authority: CN
Inventors: 蒋协远; 张腾; 韩巍; 王军强
Original assignee: Beijing Jishuitan Orthopedic Robot Engineering Research Center Co ltd; Beijing Jishuitan Hospital; Tinavi Medical Technologies Co Ltd
Current assignee: Beijing Jishuitan Orthopedic Robot Engineering Research Center Co ltd; Beijing Jishuitan Hospital; Tinavi Medical Technologies Co Ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-03-28
Anticipated expiration: 2042-12-12
Also published as: CN115607253A

Abstract

The application provides a femoral neck internal fixation screw. In the closed hollow nail internal fixation that resets of femoral neck internal fixation screw is applied to treatment femoral neck fracture, include: the head nail part comprises a head thread arranged at the front end and an assembling end arranged at the rear end; the main part, the main part is including the head of a nail, afterbody screw thread and screw rod, the front end of screw rod is equipped with the installation department, the assembly end with the installation department cooperation makes the assembly end can be followed the axis and be in the spacing space that forms removes in the installation department, head of a nail, afterbody screw thread and screw rod set gradually to the forward position axis from the back. The application discloses set screw changes the pressurization effect of maintaining the fracture end in the femoral neck, can prevent excessively moving back the nail, realizes moving back the quantization control of nail scope, promotes the healing effect of patient fracture end.

Description

Internal fixing screw for femoral neck

Technical Field

The application relates to the technical field of medical equipment, in particular to a femoral neck internal fixation screw.

Background

In a procedure for treating a femoral neck fracture, a fixation screw is generally used to pass through the femur to fix and compress the femoral neck fracture site. The existing internal fixing screw is composed of a screw cap, a screw rod and a threaded tip, and although the structure can realize the compression of the fracture end in the screw inserting process, the fracture end is often subjected to the situation of shortened healing under the influence of bone absorption and compression in the fracture healing process.

While proper foreshortening may be beneficial for fracture healing, excessive foreshortening can adversely affect the biomechanical environment of the hip joint. Meanwhile, the phenomenon of nail withdrawal after the shortened healing can cause irritation of soft tissues at the nail cap, so that the patient feels uncomfortable and painful, and the joint movement is limited. The existing internal fixation screw is not easy to maintain the pressurization to the fracture end, the pressurization effect is poor, in addition, the existing internal fixation screw can not prevent the excessive nail withdrawal, and the distance of the nail withdrawal can not be controlled.

Disclosure of Invention

In view of this, the embodiment of the present application provides a fixing screw in a femoral neck, so as to solve the problems that the pressurization on the fractured end is not easy to maintain, the pressurization effect is poor, excessive nail withdrawal cannot be prevented, and the nail withdrawal distance cannot be controlled in the prior art.

The embodiment of the application provides a femoral neck internal fixation screw, includes: the head nail part comprises a head thread arranged at the front end and an assembling end arranged at the rear end; the main part, the main part includes head of a nail, afterbody screw thread and screw rod, the front end of screw rod is equipped with the installation department, the assembly end with the installation department cooperation makes the assembly end can be followed the axis and be in spacing space that forms removes in the installation department, head of a nail, afterbody screw thread and screw rod set gradually to the forward position axis after following.

According to some embodiments of the application, the assembly end adopt the joint mode with the installation department is connected, be equipped with the buckle on the assembly end, buckle rigid connection is in the rear end of head screw thread, the assembly end passes through the buckle with the installation department joint.

According to some embodiments of the application, the buckle is provided with an elastic clamping ring, and the rear end of the elastic clamping ring protrudes outwards to form a clamp.

According to some embodiments of the present application, a snap groove is provided on the mounting portion, the snap groove is configured to have the same shape as the snap, the length of the snap groove is greater than the length of the snap, and the snap is slidably mounted in the snap groove.

According to some embodiments of the application, the front end of the buckle groove is provided with a limiting protrusion, and after the buckle is inserted into the buckle groove, the limiting protrusion is matched with a clamp of the buckle to limit the buckle to be separated from the buckle groove when the buckle slides forwards.

According to some embodiments of the present application, the limiting space is formed between the end surface of the limiting protrusion and the rear end of the fastening groove in the cavity of the fastening groove.

According to some embodiments of this application, the assembly end adopt cup joint the mode with the installation department is connected, be equipped with pullover on the assembly end, the assembly end passes through pullover slidable mounting be in on the installation department.

According to some embodiments of the application, be equipped with on the installation department with the loop bar of pullover cooperation installation, be equipped with stop gear on the loop bar, the length of loop bar is greater than the length of pullover.

According to some embodiments of the application, the interior hexagonal recess that is equipped with in the nail cap, the interior hexagonal recess is used for being connected with the screwdriver, the nail cap is responded to and is applyed the rotatory external force of screwdriver, drives the screw rod follows the screwdriver rotates together.

According to some embodiments of the application, the tail thread is arranged on the screw rod close to one side of the nail cap, and the tail thread is used for being locked with the cortical bone of the outer side wall of the femur.

According to some embodiments of the application, the pitch of the head thread is greater than the pitch of the tail thread, the head thread with the tail thread forms a double-thread structure for maintaining the compression of the fracture end of the femoral neck when the femoral neck internal fixation screw is placed in.

According to some embodiments of the application, the main body part is designed to be of an integrally formed structure, and the stud part is detachably connected with the main body part.

The femoral neck internal fixation screw provided by the embodiment of the application is applied to an orthopedic internal fixation implant in a femoral neck fracture operation, and through the head threads arranged at the front end of the head nail part and the tail threads arranged on the main body part, the pressurization effect of the screw on the fracture end is kept through the double-thread structural design, the pressurization is easier to maintain than that of a traditional single-thread screw, and the fixation of the tail threads and cortical bone also provides stability for the whole screw; the cooperation installation between assembly end and the installation department makes the assembly end can follow the spacing space removal that the axis formed in the installation department, and spacing space provides for the screw and moves back the nail scope, and the unit mount in the art of not only being convenient for has realized moving back moreover that the quantization of nail scope is controllable, realizes the controllable nail function of moving back of preventing of distance. Compare traditional femoral neck internal fixation screw, this application is changeed and is maintained the pressurization effect to the fracture end, can prevent excessively moving back the nail, has realized moving back the quantization control of nail distance, promotes the healing effect of patient's fracture end.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the overall external structure of a femoral neck internal fixation screw provided in an embodiment of the present application;

FIG. 2 is a schematic structural view of a head portion of a fixation screw in a femoral neck according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a main body portion of a femoral neck internal fixation screw provided by an embodiment of the present application;

fig. 4 is a cross-sectional structural diagram of a femoral neck internal fixation screw provided by an embodiment of the application.

Wherein, in the figures, the respective reference numerals: 1. a stud portion; 11. a head thread; 12. an assembly end; 121. buckling; 1211. an elastic snap ring; 2. a main body portion; 21. a nail cap; 211. an inner hexagonal groove; 22. tail threads; 23. a screw; 24. an installation part; 241. a snap groove.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "connected," "mounted," "fixed," and the like are to be construed broadly unless otherwise explicitly specified or limited, for example: "connected" may or may not be removably connected; may be directly connected or indirectly connected through an intermediate. "fixed" may mean connected to each other and the relative positional relationship after the connection is unchanged. The directional terms used in the embodiments of the present application, such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "top", "bottom", and the like, refer only to the orientation of the drawings. The directional terms are used for better and clearer illustration and understanding of the embodiments of the present application, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the embodiments of the present application.

As described in the background art, femoral neck fractures are one of the common fractures in orthopedics, and with the accelerated aging society, the incidence of femoral neck fractures also increases year by year. The operation is the main mode for treating the femoral neck fracture, and the closed reduction hollow nail internal fixation is an important operation formula selected by an operator in the face of the fracture of a young femoral neck and the fracture of a displaced smaller femoral neck due to the characteristics of rapidness, minimal invasion, less bleeding and the like.

The existing internal fixing screw is composed of a screw cap, a screw rod and a threaded tip, and although the structure can realize the compression of the fracture end in the screw inserting process, the fracture end is often subjected to the situation of short healing under the influence of bone absorption and compression in the fracture healing process. The current clinical mainstream opinion is that proper shortening may be beneficial for fracture healing, but excessive shortening adversely affects the biomechanical environment of the hip joint. Meanwhile, the phenomenon of shortening, healing and retreating the nail can cause irritation of soft tissues at the nail cap, so that discomfort, pain and limited joint movement of a patient are caused.

Therefore, in view of the problems in the prior art, there is a need in the clinical field for an internal fixation screw that can simultaneously satisfy fracture compression, maintain the compression effect on the fractured bone end, prevent the screw from being excessively withdrawn, and realize the quantitative control of the withdrawal distance.

Alternative embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1, 2, 3 and 4, embodiments of the present application provide a femoral neck internal fixation screw. The internal femoral neck fixing screw comprises: the head nail part 1, the head nail part 1 includes the head screw thread 11 that locates the front end and locates the assembly end 12 of the rear end; the main part 2, main part 2 include the head of a nail 21, tail screw thread 22 and screw rod 23, and the front end of screw rod 23 is equipped with installation department 24, and assembly end 12 and the cooperation of installation department 24 make assembly end 12 can follow the spacing space removal that the axis formed in installation department 24, and head of a nail 21, tail screw thread 22 and screw rod 23 set gradually along the axis from the back.

The application discloses thighbone neck internal fixation screw can be applied to in the closed hollow nail internal fixation art that resets of treatment thighbone neck fracture as an orthopedics internal fixation implant. The internal femoral neck fixing screw mainly comprises two parts, namely a head nail part 1 and a main body part 2; the head nail part 1 can be divided into a head thread 11 at the tip end and a mounting end 12 at the tail end, the head thread 11 is used for screwing in the femoral head to enable an internal fixing screw to enter the femur along a drilling direction, and the mounting end 12 is used for being connected with a mounting part 24 arranged at the front end of the main body part 2 to enable the head nail part 1 to be combined with the main body part 2.

Further, the main body part 2 is further divided into a screw cap 21, a tail thread 22 and a screw rod 23, wherein the screw cap 21 is used for connecting a screwdriver in the screw inserting process, the screw cap 21 drives the tail thread 22 and the screw rod 23 to rotate together under the action of the rotating external force of the screwdriver, and meanwhile, the existence of the screw cap 21 also ensures that the screw cannot excessively enter cortical bone, so that the screw can be taken out conveniently; the tail thread 22 is connected and locked with the cortical bone of the outer side wall of the femur after the screw is placed, so that soft tissue irritation caused by the fact that the main body part 2 is withdrawn from the cortex can be effectively prevented, and stability can be provided for the whole screw; the head of the screw 23 is provided with a mounting part 24, and the screw 23 is connected with the head nail part 1 through the mounting part 24, so that the screw 23 drives the head nail part 1 to rotate and deeply penetrate into the femur.

In the present application, one end of the head thread 11 is regarded as a front end, and one end of the nut 21 is regarded as a rear end, so that the direction of the head thread 11 side in the present application is "front" or "front", the direction of the nut 21 side is "rear" or "rear", the setting of the specific direction can be adjusted according to the actual scene, and the above specific orientation is only limited for convenience of describing the technical solution, and does not limit the embodiments of the present application.

In some alternative implementations, the mounting portion 24 of the screw 23 of the present application and the mounting end 12 of the stud portion 1 can be connected in two different ways: the first connection mode is clamping, for example, the buckle on the assembling end 12 is connected with the buckle groove in the mounting part 24, and the second connection mode is sleeve connection, for example, the sleeve head on the assembling end 12 is connected with the sleeve rod on the mounting part 24; however, no matter which kind of connected mode is taken, assembly end 12 all can follow the spacing space that forms in the installation department 24 and carry out the back-and-forth movement, because assembly end 12 can slide along installation department 24 in the certain distance, consequently, this application can guarantee that the screw can move back the nail in certain quantization scale, has realized controllable nail function of preventing moving back. The following examples will illustrate the above two connection methods separately.

Through the technical scheme, the internal fixation screw for the femoral neck keeps the pressurizing effect of the screw on the fractured end through the head threads arranged at the front end of the head nail part and the tail threads arranged on the main body part, and is easier to maintain the pressurizing compared with the traditional single-thread screw, and the fixation of the tail threads and cortical bone also provides the stability for the whole screw; the cooperation installation between assembly end and the installation department makes the assembly end can follow the spacing space removal that the axis formed in the installation department, and spacing space provides for the screw and moves back the nail scope, and the unit mount in the art of not only being convenient for has realized moving back moreover that the quantization of nail scope is controllable, realizes the controllable nail function of moving back of preventing of distance. Compare traditional femoral neck internal fixation screw, this application is changeed and is maintained the pressurization effect to the fracture end, can prevent excessively moving back the nail, has realized moving back the quantization control of nail distance, promotes the healing effect of patient's fracture end.

Referring to fig. 1 and 2, in some embodiments, the mounting end 12 is connected to the mounting portion 24 by a snap-fit connection, a snap 121 is provided on the mounting end 12, the snap 121 is rigidly connected to a rear end of the head thread 11, and the mounting end 12 is snapped into the mounting portion 24 by the snap 121.

In an alternative solution, the fitting end 12 of the present application is of a snap-in type structure, the fitting end 12 is configured as a snap 121, the snap 121 is disposed behind the head thread 11, and the head thread 11 is disposed on the outer wall of the front end of the stud portion 1, i.e. the head thread 11 is composed of an external thread spirally disposed on the outer wall of the front end of the stud portion 1.

Optionally, the head of the front end of the stud portion 1 is conical or truncated cone-shaped, an integrated structure or a separated structure may be adopted between the buckle 121 and the head thread 11, the whole buckle 121 is a cylindrical structure, and the diameter of the buckle 121 is smaller than that of the head thread 11.

Referring to fig. 1 and 2, in some embodiments, the clip 121 is provided with a resilient clip 1211, and a rear end of the resilient clip 1211 protrudes outward to form a clip.

In some possible implementations, an elastic snap ring 1211 is disposed on an outer side of the buckle 121, a body structure is disposed on an inner side of the buckle 121, the elastic snap ring 1211 may be composed of an upper snap ring and a lower snap ring, the upper snap ring and the lower snap ring are disposed on two sides of the body structure in parallel, and gaps are disposed between the upper snap ring and the body structure and between the lower snap ring and the body structure.

Go up the rear end of snap ring and the rear end of lower snap ring and all outwards bulge and form the checkpost, when aim at installation department 24 with buckle 121 and insert, the checkpost of buckle 121 both sides inwards compresses under the extrusion of installation department 24, the inner wall and the body structure contact of checkpost to guarantee in elastic snap ring 1211 can enter into the cavity of installation department 24, after elastic snap ring 1211 enters into installation department 24 completely, the checkpost of buckle 121 both sides outwards kick-backs, elastic snap ring 1211 returns to the shape before inserting installation department 24.

According to the technical scheme provided by the embodiment of the application, the head thread 11 at the front end of the head nail part 1 can be screwed into the femoral head in the screw inserting process, and can also pressurize the fracture end; can peg graft head nail portion 1 and main part 2 through buckle 121 and become an organic whole, put into in-process main part 2 at the screw and can drive head nail portion 1 rotatory together, and the installation of the internal fixation screw of grafting mode in being convenient for art improves operation efficiency.

Referring to fig. 1, 2 and 3, in some embodiments, the mounting portion 24 is provided with a catch groove 241, the catch groove 241 is configured to have the same shape as the catch 121, the length of the catch groove 241 is greater than the length of the catch 121, and the catch 121 is slidably mounted in the catch groove 241.

According to the invention, the head part of the screw 23 is provided with the buckle groove 241, the buckle groove 241 is used for being combined with the buckle 121 of the stud part 1, therefore, the buckle groove 241 is constructed into a shape similar to the shape of the buckle 121, the buckle groove 241 is positioned in the cavity of the head part of the screw 23, and after the buckle 121 is aligned with the buckle groove 241 and inserted, the buckle 121 can slide in the cavity formed by the buckle groove 241.

In some possible implementations, the length of the catch groove 241 is greater than the length of the catch 121, and thus, after the catch 121 is inserted into the catch groove 241, there is a framing amount between the catch 121 and the catch groove 241 that allows the catch 121 of the stud part 1 to slide therein. Specifically, after the latch 121 is inserted into the latch groove 241, a sliding distance is generated between the rear end of the latch 121 and the bottom of the latch groove 241, and the latch 121 can move back and forth along the axis within the range of the sliding distance.

Referring to fig. 1, 2 and 3, in some embodiments, the front end of the catching groove 241 is provided with a limiting protrusion, and after the catch 121 is inserted into the catching groove 241, the limiting protrusion is engaged with the catch of the catch 121 to limit the catch 121 from being released from the catching groove 241 when sliding forward.

Be equipped with spacing arch at the inside front end of die cavity in buckle groove 241, spacing arch is located the inner wall both sides of buckle groove 241, inserts buckle 121 behind buckle groove 241, and spacing arch on the buckle groove 241 inner wall respectively with the preceding terminal surface butt of last checkpost and lower checkpost on buckle 121. Under the displacement limiting action of the limiting protrusion, the buckle 121 cannot be separated from the buckle groove 241 under the squeezing action of an external force perpendicular to the axis, but can move in a limiting space formed between the limiting protrusion and the bottom of the buckle groove 241.

Therefore, the distance between the rear end of the limiting protrusion and the bottom of the catching groove 241 on the horizontal axis is the maximum shortening amount of the catch 121 in the catching groove 241, i.e. the maximum sliding distance of the catch 121 in the catching groove 241. Because buckle 121 can slide in buckle groove 241, and buckle 121 has the biggest short-range volume, consequently this application can realize the controllable nail function of preventing moving back of distance, and what make the screw move back the nail scope accomplishes the quantization controllable.

In practical applications, by providing different sizes of stud portions 1, the maximum sliding distance of the catch 121 in the catch groove 241 can be adjusted, for example: by arranging the buckles 121 with different lengths, the maximum sliding distance of the buckles 121 in the buckle grooves 241, namely the maximum distance for allowing the screw to be withdrawn, is adjusted.

Referring to fig. 1, 2 and 3, in some embodiments, a limiting space is formed between an end surface of the limiting protrusion and a rear end of the catching groove 241 in a cavity of the catching groove 241.

The utility model provides a buckle groove 241 is for setting up the cavity at the screw rod 23 head, and spacing space of certain length is formed between spacing arch in the cavity and buckle groove 241 bottom (the rear end of buckle groove 241 promptly), makes buckle 121 can slide back and forth in spacing space along the inner wall of buckle groove 241.

According to the technical scheme that this application embodiment provided, through the connected mode who adopts buckle 121 and buckle groove 241 between this application stud portion 1 and the main part 2, the installation of internal fixation screw in the doctor's art of not only being convenient for, and through adjusting buckle 121 at the inside biggest sliding distance of buckle groove 241, thereby realize the controllable nail function of preventing moving back of distance, the nail scope of moving back that makes internal fixation screw becomes quantization controllable, prevent that the excessive nail that moves back of postoperative from leading to nail cap department soft tissue to irritate, arouse patient's discomfort, pain, symptoms such as joint activity is limited.

The above embodiment describes in detail the connection between the stud portion 1 and the body portion 2 by the catch 121 and the catch groove 241, and the following describes another connection with reference to a specific embodiment.

In another alternative, the assembling end 12 is connected to the mounting portion 24 by a sleeve connection, a sleeve head is provided on the assembling end 12, and the assembling end 12 is slidably mounted on the mounting portion 24 through the sleeve head.

Alternatively, the mounting end 12 may be sleeved on the mounting portion 24, in which case the mounting end 12 is configured as a sleeve head disposed behind the head thread 11, and the sleeve head and the head thread 11 may be of an integrated structure or a separated structure. The sleeve head is integrally of a cylindrical structure, and the diameter of the sleeve head is smaller than that of the head thread 11.

In some embodiments, the mounting portion 24 is provided with a sleeve rod which is installed in cooperation with the sleeve head, the sleeve rod is provided with a limiting mechanism, and the length of the sleeve rod is greater than that of the sleeve head.

This application can also be equipped with the loop bar with pullover looks adaptation on installation department 24, pullover slidable cover on the loop bar, and the loop bar can be cylindrical structure, and the stop gear who sets up on the loop bar is used for supporting pullover, avoids pullover from loop bar landing. In practical application, because the length of the sleeve rod is greater than that of the sleeve head, and under the displacement limiting effect of the limiting mechanism, a distance for the sleeve head to move is generated between the rear end of the limiting mechanism and the rear end of the sleeve rod. Thus, after the cuff is mounted with the stem, the cuff can slide along the stem over a distance, i.e. the cuff can move back and forth along the axis over the range of distances.

In some possible implementations, by providing different specifications of the head nail 1, the maximum sliding distance of the loop on the loop bar can be adjusted, for example: by arranging the sleeve heads with different lengths, the maximum sliding distance of the sleeve heads on the sleeve rod is changed, and the larger the maximum sliding distance is, the larger the maximum distance for allowing the screw to retreat is.

According to the technical scheme that this application embodiment provided, still can be connected through the mode of pullover with the loop bar between this application first nail portion 1 and the main part 2, this kind of connected mode is convenient for the installation of doctor intraoperative internal fixation screw, through adjusting the biggest sliding distance of pullover on the loop bar, thereby realize the controllable nail function of preventing moving back of distance, make internal fixation screw's the nail scope of moving back become the quantization controllable, prevent that the post-operative excessive nail that moves back from leading to nail cap department soft tissue to irritate, arouse patient's discomfort, pain, symptoms such as joint activity is limited.

Referring to fig. 4, in some embodiments, the nut 21 is provided with an inner hexagonal recess 211, the hexagonal recess 211 is used for connecting with a screwdriver, and the nut 21 drives the screw 23 to rotate along with the screwdriver in response to a rotating external force applied to the screwdriver.

The utility model provides a nail cap 21 constructs for being circular arc's round platform shape structure all around, and nail cap 21 sets up at the rear end of screw rod 23, and is located the rear of afterbody screw thread 22, and the front end and the screw rod 23 fixed connection of nail cap 21, and the front end diameter of nail cap 21 is greater than the rear end diameter.

Optionally, an inner hexagonal groove 211 is formed in the nail cap 21, and in the femoral neck fracture operation process, a screwdriver is used to be connected with the inner hexagonal groove 211, and external force is applied to the inner hexagonal groove 211 through the screwdriver, so that the inner hexagonal groove 211 drives the main body part 2 and the head nail part 1 to rotate together under the action of the external force. This application sets up the nail cap 21 through the tail end at screw rod 23, and the existence of nail cap 21 can be guaranteed that the screw can not excessively enter into the bone cortex in, is convenient for take out the screw afterwards.

Referring to fig. 1, 3 and 4, in some embodiments, a tail thread 22 is provided on the threaded rod 23 near one side of the nut 21, and the tail thread 22 is used for locking with the outer lateral femoral cortical bone.

The utility model provides a afterbody screw thread 22 sets up in the outside of screw rod 23, and afterbody screw thread 22 comprises the external screw thread of spiral setting on screw rod 23 rear end outer wall, and afterbody screw thread 22 is put into the back at the screw for with thighbone lateral wall cortex bone connection locking, both can prevent effectively that main part 2 from withdrawing from leading to the soft tissue to irritate outside the cortex, can provide stability for the screw is whole again.

Referring to fig. 1 and 4, in some embodiments, the pitch of the head thread 11 is greater than the pitch of the tail thread 22, and the head thread 11 and the tail thread 22 form a double thread structure for maintaining compression on the fractured end of the femoral neck when the set screw is placed in the femoral neck.

This application has formed double thread structure through the head screw thread 11 of 1 front end of head nail portion and the afterbody screw thread 22 of 2 rear ends of main part to for head screw thread 11 and afterbody screw thread 22 set up different screw pitches, the screw pitch of the head screw thread 11 on the head nail portion 1 is greater than the screw pitch of the afterbody screw thread 22 on the main part 2.

This application uses the design of double thread structure to pressurize, puts into the thighbone at the screw after, and the double thread structure pressurizes the fracture end simultaneously, and traditional single thread structure is compared to double thread pressurization mode, changes to maintain the pressurization to the fracture end, has guaranteed the pressurization effect of screw to the fracture end to the afterbody screw also provides stronger stability for the screw is whole with the fixed of cortex bone.

In the present application, the parts included in the main body 2 may be fixedly connected by integral molding, or may be detachably combined, for example: the nail cap 21 and the screw 23 are arranged as independent components, the nail cap 21 and the screw 23 are detachably connected, and optionally, the head nail part 1 and the main body part 2 are fixed in a detachable connection mode.

According to the technical scheme that this application embodiment provided, the double thread structural design of this application has kept the screw to the pressurization effect of fracture end, changes and maintains the pressurization to the fracture end, and the fixed stronger stability that also provides for the screw is whole for the afterbody screw thread and the cortex bone. No matter adopt the joint or the mode that cup joints between the head nail portion 1 of this application and the main part 2, assembly end 12 all can slide along the spacing space that installation department 24 formed, and through adjusting the biggest sliding distance, adjust the maximum distance that allows the screw to move back the nail, thereby realize that the distance is controllable prevents moving back the nail function, the nail scope that moves back that makes interior set screw becomes the quantization controllable, prevent that the postoperative excessively moves back the nail and leads to nail cap department soft tissue to irritate, arouse the patient discomfort, it is painful, symptoms such as joint activity is limited. The application provides a femoral neck internal fixation screw not only is convenient for install and use in the art, can realize the function that adds pressure and controllable nail that moves back in the art simultaneously moreover to the efficiency and the operation effect of femoral neck fracture operation have been promoted.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention. Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A femoral neck internal fixation screw, comprising:

the head nail part comprises a head thread arranged at the front end and an assembling end arranged at the rear end;

the main body part comprises a nail cap, tail threads and a screw rod, an installation part is arranged at the front end of the screw rod, the assembly end is matched with the installation part, the assembly end can move in a limiting space formed in the installation part along an axis, and the nail cap, the tail threads and the screw rod are sequentially arranged from back to a front edge axis;

the assembling end is connected with the mounting part in a clamping mode, a buckle is arranged on the assembling end, the buckle is rigidly connected to the rear end of the head thread, and the assembling end is clamped with the mounting part through the buckle;

the buckle is provided with an elastic snap ring, and the rear end of the elastic snap ring protrudes outwards to form a clip;

the installation part is provided with a buckle groove, the buckle groove is constructed to have the same shape as the buckle, the length of the buckle groove is larger than that of the buckle, the buckle can be slidably installed in the buckle groove, and the maximum sliding distance of the buckle in the buckle groove can be adjusted by arranging the buckles with different lengths.

2. The femoral neck internal fixation screw of claim 1, wherein the front end of the snap groove is provided with a limiting protrusion, and when the snap is inserted into the snap groove, the limiting protrusion is engaged with the catch of the snap to limit the snap from being released from the snap groove when the snap slides forward.

3. The femoral neck internal fixation screw of claim 2, wherein the spacing space is formed between the end surface of the spacing protrusion and the rear end of the snap-fit groove within the cavity of the snap-fit groove.

4. The femoral neck internal fixation screw of claim 1, wherein the nut has a socket head for connection to a screwdriver, the nut being adapted to rotate with the screwdriver in response to an external rotational force applied to the screwdriver.

5. The femoral neck internal fixation screw of claim 1, wherein the tail thread is disposed on the threaded shaft near a side of the nut, the tail thread for locking with the lateral femoral wall cortical bone.

6. The femoral neck internal fixation screw of claim 1, wherein the head thread has a pitch greater than a pitch of the tail thread, the head thread and the tail thread forming a double thread configuration for maintaining compression of the fractured end of the femoral neck when the femoral neck internal fixation screw is placed therein.

7. The femoral neck internal fixation screw of claim 1, wherein the main body portion is integrally formed, and the head nail portion is detachably connected to the main body portion.