CN218420009U - Extendable screw - Google Patents

Abstract

The utility model discloses an extensible screw, which comprises a sub-screw and a mother screw, wherein the sub-screw comprises a screw tip and a screw body, the screw tip is arranged at the first end of the sub-screw, the side wall of the screw tip is provided with a first thread structure, and the outer surface of the screw body is smooth; the female nail cavity, the first end of female nail set up first uncovered, and the nail body inserts in the female nail, the nail body can be in the inside axial slip of following of female nail. The utility model discloses in, the sub-nail can be at the inside endwise slip of female nail, thereby change the length that can prolong the screw, when can prolong the screw and squeeze into the affected part, the second end of sub-nail and the second end butt of female nail, can prolong the screw and bore the affected part through first helicitic texture, the nail point is inside the epiphysis, can prolong the position that the screw corresponds the growth plate is smooth, reduce the retardation to the epiphysis, and simultaneously, along with the growth of growth plate, can prolong the screw and extend gradually, avoid blocking the growth plate osteogenesis, can prolong the screw and can place the longer time in the affected part, thereby avoid taking out prematurely and form bone bridge in the affected part.

Description

Extendable screw

Technical Field

The utility model relates to the field of medical equipment, in particular to can prolong screw

Background

Fracture of children near epiphysis often needs good reduction and strong internal fixation, and for fracture of femoral neck, proximal tibia fracture, posterior cruciate ligament avulsion fracture and anterior cruciate ligament avulsion fracture of children, hollow nails are often needed for fixation after reduction, and most cases need to pass through a growth plate. On one hand, the threads of the hollow nail can influence the growth of the growth plate, so that the epiphyseal block effect is achieved; on the other hand, after premature removal of the hollow nail, the residual track tends to form a bone bridge, resulting in metaphyseal deformity.

SUMMERY OF THE UTILITY MODEL

For solving at least one among the above-mentioned technical problem, the utility model provides a can prolong screw, the technical scheme who adopts as follows:

the utility model provides an extensible screw, which comprises a sub-screw and a main screw, wherein the sub-screw comprises a screw tip and a screw body, the screw tip is arranged at the first end of the sub-screw, and the side wall of the screw tip and the side wall of the screw body close to the screw tip are provided with a first thread structure; the female nail is hollow, the first end of female nail sets up first uncovered, the nail body inserts in the female nail, the nail body can the inside axial slip of following of female nail.

In some embodiments of the present invention, the female screw outer wall is provided with a second thread structure.

The utility model discloses an in some embodiments, the nail body includes connecting portion, sliding part, the sliding part set up in the second end of sub-nail, connecting portion are in the nail point with between the sliding part, be provided with first sliding structure on the sliding part, the inner wall of female nail is provided with second sliding structure, first sliding structure with second sliding structure connects.

The utility model discloses an in some embodiments, first sliding structure includes protruding structure, protruding structure set up in on the lateral wall of sliding part, protruding structure sets up along the axial, second sliding structure includes the recess, the recess sets up along the axial.

The utility model discloses an in some embodiments, the first end of female nail is provided with limit structure, limit structure centers on first uncovered setting, limit structure's internal diameter is greater than the external diameter of connecting portion, limit structure's internal diameter is less than the external diameter of sliding part.

In some embodiments of the present invention, the second end of the female pin is provided with a first recess, the end surface of the sliding portion is provided with a second recess, and the first recess can be embedded into the second recess.

In some embodiments of the present invention, the sub-nail is hollow, the nail tip is provided with a second opening, and the second end of the sub-nail is provided with a first guide pin hole.

In some embodiments of the present invention, the second end of the female pin is provided with a second guide pin hole, and the guide pin can pass through the second guide pin hole and the first guide pin hole.

In some embodiments of the present invention, the outer diameter of the nail tip is gradually reduced, and the outer diameter of the nail tip end is the smallest.

In some embodiments of the present invention, the sub-nail and the main nail are made of a metal material or an absorbable material.

The embodiment of the utility model discloses a following beneficial effect has at least: the utility model discloses in, the sub-nail can be at the inside axial slip of female nail, thereby change the length that can prolong the screw, when can prolong the screw and squeeze into the affected part, the second end of sub-nail and the second end butt of female nail, can prolong the screw and keep less length, can prolong the screw and dig into the affected part through first helicitic texture, the nail tip is inside the epiphysis, can prolong the position that the screw corresponds the growth plate and smooth, reduce the retardation to the epiphysis, and simultaneously, along with the growth of growth plate, can prolong the screw and extend gradually, avoid blocking the growth plate osteogenesis, can prolong the screw and can place the longer time in the affected part, thereby avoid taking out too early and form the bone bridge in the affected part.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of the extendable screw according to the present invention;

FIG. 2 is a cross-sectional view of the extendable screw driver of the present invention;

FIG. 3 is a cross-sectional view of a female screw in an extendable screw according to the present invention;

FIG. 4 is a cross-sectional view of the extendable screw of the present invention;

fig. 5 is a top view of the extendable screw female pin of the present invention.

Reference numerals are as follows:

101. nailing tips; 102. a first thread structure; 103. a second recessed portion; 104. a connecting portion; 105. a sliding part; 106. a raised structure; 107. a second opening; 108. a first guide pin hole;

201. a first opening; 202. a second thread formation; 203. a first recess; 204. a groove; 205. a limiting structure; 206. and a second guide pin hole.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout, and which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are used to indicate an orientation or positional relationship based on that shown in the drawings, it is only for convenience of description and simplicity of description, and it is not intended to 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. The features defined as "first" and "second" are used to distinguish feature names rather than having a special meaning, and further, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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.

An embodiment of the utility model provides a can prolong screw, as shown in fig. 1, can prolong screw includes sub-nail, female nail.

As shown in fig. 2, in some examples, the sub-staple includes a tip 101, a body, the tip 101 entering the body tissue first, and the body then also entering the body tissue. After the extendable screw is drilled, the spike 101 is inside the epiphysis and the shank comes into contact with the growth plate. It will be appreciated that the spike 101 is provided at a first end of the sub-spike and the length of the spike 101 is less than the thickness of the epiphysis, so that the full extent of the spike 101 is within the epiphysis, avoiding damage to the epiphysis by the spike 101, whilst also preventing the spike 101 from coming into contact with the growth plate and impeding growth of the growth plate.

Further, to ensure that the relative position of the spike 101 and the epiphysis is fixed and also to facilitate the leading drilling of the spike 101 into the body tissue, the side wall of the spike 101 is provided with a first threaded formation 102. Further, the side wall of the nail body close to the nail tip 101 is provided with a first thread structure 102, and the outer surface of the rest part of the nail body is smooth, so that the growth of the growth plate is ensured. In particular, the density of the first thread form 102 is greater and the thread depth of the first thread form 102 is greater to increase the contact area of the first thread form 102 with the epiphysis.

In some examples, the outside diameter of the spike 101 is tapered, with the smallest outside diameter at the end of the spike 101. When the nail point 101 drills into the human tissue, the contact area of the nail point 101 and the human tissue is smaller, and under the condition that the force application is the same, the smaller contact area can provide larger pressure, so that the nail point 101 can drill into the human tissue conveniently, and along with the progress of the drilling process of the nail point 101, the contact area of the nail point 101 and the human tissue is gradually increased, so that all the structures of the extensible screw gradually enter into the human tissue. At the same time, the sharp structure at the end of the nail tip 101 is also avoided, preventing articular cartilage of the epiphysis. In some examples, spike tip 101 may not be provided with a portion of progressively decreasing outer diameter due to sub-spike diameter limitations. As shown in FIG. 3, the female nail is hollow, a first opening 201 is provided at a first end of the female nail pair, and the first opening 201 is communicated with the hollow portion of the female nail. Inside the sub-nail inserted female nail through first opening 201, specifically, inside the nail body of sub-nail inserted female nail, and nail point 101 was outside female nail, was convenient for can prolong the screw and digs into human tissue through nail point 101. The nail body can carry out the axial slip in female nail inside, along with the progress of axial slip, can prolong the length of screw and produce the change. The second end of the secondary nail can be abutted against the second end of the primary nail in a natural state by the extensible bolt, so that the length of the extensible bolt is shorter; after the screw can be prolonged to be inserted into human tissues for a period of time, along with the growth of the growth plate, the nail tip 101 is gradually pulled out from the interior of the female nail under the action of traction force, and the length of the screw can be prolonged to be gradually increased.

In some examples, the outer wall of the female nail is provided with the second thread structure 202, so that the whole screw can be extended to drill into human tissues, meanwhile, the connection strength of the female nail and the bone neck is improved, and the relative position between the female nail and the bone neck is ensured to be fixed.

In some examples, the second end of the female nail is provided with a first recess 203, the second end of the male nail is provided with a second recess 103, the first recess 203 corresponds to the shape of the second recess 103, in particular, the first recess 203 can be embedded in the second recess 103. Further, the side wall of the first recess 203 has an edge angle, the side wall of the second recess 103 is provided with an edge angle accordingly, the extendable screw is further provided with a fastening member corresponding to the shape of the first recess 203, the fastening member can be inserted into the first recess 203, and by applying force to the fastening member, the female screw performs a rotational motion following the rotation of the fastening member.

When the extendable screw is in a natural state, the first recess 203 is embedded into the second recess 103, and the length of the extendable screw is small, and at this time, the position of the extendable screw is adjusted to make the extendable screw in a state to be drilled. The fastening part is inserted into the first concave part 203, the female nail rotates, and the male nail also rotates through the limitation of the first concave part 203 and the second concave part 103, so that the extendable screw can be drilled into human tissues, and the operation is convenient.

In some examples, the male and female pins are made of a metal material, and particularly, since the extendable screw needs to be present in a human body for a long time, it is required to use a metal material that is non-toxic and harmless. Or the primary nail and the secondary nail are made of absorbable materials, the absorbable materials have certain structural strength when initially entering the human body, the affected part is supported, and the absorbable materials are absorbed by the human body after entering the human body for a period of time, so that the screws do not need to be taken out, the pain of a patient is reduced.

As shown in fig. 4, in some examples, the nail body includes connecting portion 104, sliding part 105, and sliding part 105 cooperates with the inner wall of female nail to guarantee that the secondary nail extends with comparatively definite axial direction in the female nail, promote the supporting effect of extendable screw, specifically, sliding part 105 remains in the inside of female nail all the time, and sets up in the second end of secondary nail, guarantees that the partial length that the secondary nail extends from first uncovered 201 is sufficient. The connecting portion 104 is between the spike 101 and the sliding portion 105, and as the length of the extendable screw increases, the connecting portion 104 is gradually pulled out of the female nail and the side wall of the connecting portion 104 comes into contact with the growth plate.

When it is desired to remove the extendable screw from the body, the embedded relationship between the first recess 203 and the second recess 103 has been broken due to the greater length of the extendable screw at this time. At this point, the rotation of the female pin makes it difficult to bring the sub-pin into a corresponding rotation, making it difficult to disengage the sub-pin from the epiphysis. Therefore, the sliding part 105 is provided with a first sliding structure, the female nail is internally provided with a second sliding structure, the first sliding structure is matched with the second sliding structure, and when the length of the extendable screw is increased, the first sliding structure and the second sliding structure play a role in guiding, so that the sub-nail can extend outwards from the set direction conveniently; when the extendable screw is taken out, the first sliding structure and the second sliding structure limit the relative rotation between the sub-nail and the female nail, when the female nail is rotated, the sub-nail is rotated simultaneously, and the first thread structure 102 and the second thread structure 202 move along the threaded hole generated when the extendable screw enters the human body, so that the extendable screw is taken out.

In some examples, the first sliding structure includes a protruding structure 106, the protruding structure 106 is disposed on a sidewall of the sliding portion 105, the second sliding structure includes a groove 204, and the protruding structure 106 is inside the groove 204 and slides inside the groove 204. It will be appreciated that the raised formation 106 and the recess 204 are in a clearance fit to facilitate the formation of a sliding pair. The raised structure 106 and the groove 204 are axially disposed as the male nail slides axially relative to the female nail. To ensure that the motion profile of the secondary staple is sufficiently long, the groove 204 extends from the second end of the primary staple to the first end of the primary staple.

Or, first sliding structure includes the boss, is provided with recess 204 on the boss, and recess 204 sets up along the axial, and the one end that recess 204 is close to nail point 101 is opened, and protruding structure 106 sets up in female nail inner wall, and protruding structure 106 extends to the first end of female nail from the second end of female nail, and the secondary nail can carry out axial sliding in the female nail. At this time, the thickness of the side wall of the female screw can be set smaller, which is convenient for lightening and lengthening the screw while maintaining the supporting strength.

In some examples, the first end of the female nail is provided with a limiting structure 205, the limiting structure 205 is arranged around the first opening 201, and the limiting structure 205 limits the maximum sliding distance of the male nail, so that the male nail is prevented from being separated from the female nail, and the male nail is difficult to take out. Specifically, when the first sliding structure comprises the protruding structure 106, the protruding structure 106 slides to the first end of the female nail, and the end of the protruding structure 106 abuts against the limiting structure 205 to block the secondary nail from further sliding; when the first sliding structure comprises a boss with a groove 204, the boss slides to the first end of the female nail, and the boss abuts against the limiting structure 205 to block the secondary nail from continuing to slide.

It will be appreciated that the inner diameter of the stop structure 205 is greater than the outer diameter of the connecting portion 104 to facilitate axial sliding of the sub-pin. Meanwhile, the inner diameter of the limiting structure 205 is smaller than the outer diameter of the sliding part 105, so that the limiting function is achieved.

As shown in fig. 5, in some examples, the sub-nail is hollow, the nail tip 101 is provided with a second opening 107, the second opening 107 is communicated with the hollow portion of the sub-nail, and the second end of the sub-nail is provided with a first guide pin hole 108 for facilitating the guide pin to pass through the sub-nail. Further, the second end of the female pin is provided with a second guide pin hole 206, so that the guide pin can conveniently penetrate through the female pin. It is understood that the first guide pin holes 108 correspond in position to the second guide pin holes 206. In the operation, the guide pin is firstly used for positioning, and then the extensible hollow nail is driven into the extensible hollow nail along the guide pin, so that the guide pin penetrates through the male nail and the female nail, and the accurate driving position of the extensible hollow nail is ensured.

In the using process, the length of the screw capable of being extended and the area of the first thread structure 102 are judged according to the X-ray film before the operation;

secondly, a guide pin is driven in the operation, the guide pin is required to be vertical to the plane of the growth plate at the moment, the electric drill is used for drilling holes to penetrate through the growth plate, the fastening part is inserted into the first concave part 203 and rotates, and the first concave part 203 is embedded into the second concave part 103, and the first sliding structure is matched with the second sliding structure, so that the sub-nail and the main nail can simultaneously rotate to enter human tissues;

again, when the extendable screw reaches a predetermined depth, the sub-spike tip 101 is fully advanced into the epiphysis. Since the first threaded structure 102 and the second threaded structure 202 cooperate with the bone structure, the position of the secondary nail in the epiphysis is fixed and the position of the primary nail in the neck of the bone is fixed. The male and female pins are relatively elongated due to the longitudinal growth of the growth plate.

Finally, the postoperative is along with patient's growth, can prolong screw length increase, until first sliding construction butt limit structure 205, inserts fastening part and reverse rotation at first depressed part 203, drives sub-nail and female nail simultaneously and rotates to but the messenger prolongs the screw and withdraws from the affected part.

In the description herein, references to the terms "one embodiment," "some examples," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like, if any, 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 invention. In this specification, the schematic representations of the terms used above do not necessarily 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.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. An extendable screw, comprising:

the sub-nail comprises a nail tip (101) and a nail body, the nail tip (101) is arranged at a first end of the sub-nail, and a first thread structure (102) is arranged on the side wall of the nail tip (101) and the side wall of the part, close to the nail tip (101), of the nail body;

the female nail, female nail cavity, the first end of female nail sets up first uncovered (201), the nail body inserts in the female nail, the nail body can the inside axial slip of following of female nail.

2. The extendable screw of claim 1, wherein said female pin outer wall is provided with a second thread structure (202).

3. The extendable screw according to claim 1 or 2, wherein the screw body comprises a connecting portion (104) and a sliding portion (105), the sliding portion (105) is disposed at the second end of the sub-screw, the connecting portion (104) is located between the screw tip (101) and the sliding portion (105), a first sliding structure is disposed on the sliding portion (105), a second sliding structure is disposed on the inner wall of the female screw, and the first sliding structure is connected with the second sliding structure.

4. The extendable screw of claim 3, wherein said first sliding structure comprises a raised structure (106), said raised structure (106) being provided on a side wall of said sliding portion (105), said raised structure (106) being provided in an axial direction, said second sliding structure comprises a groove (204), said groove (204) being provided in an axial direction.

5. The extendable screw according to claim 3, wherein the first end of the female screw is provided with a stop structure (205), the stop structure (205) being arranged around the first opening (201), the inner diameter of the stop structure (205) being larger than the outer diameter of the connecting portion (104), the inner diameter of the stop structure (205) being smaller than the outer diameter of the sliding portion (105).

6. The extendable screw according to claim 3, wherein the second end of said female screw is provided with a first recess (203), the end face of said sliding portion (105) is provided with a second recess (103), said first recess (203) being able to be embedded in said second recess (103).

7. The extendable screw of claim 1, wherein said sub-nail is hollow, a second opening (107) is provided at said nail tip (101), and a first guide pin hole (108) is provided at a second end of said sub-nail.

8. The extendable screw of claim 7, wherein a second end of said female pin is provided with a second guide pin hole through which a guide pin can pass through with said first guide pin hole (108).

9. The extendable screw of claim 1, wherein said spike (101) has a tapered outer diameter, the outer diameter of the end of said spike (101) being the smallest.

10. The extendable screw of claim 1, wherein said sub-nail and said female nail are made of a metallic material or an absorbable material.

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