CN213030816U

CN213030816U - Screw for orthopedics

Info

Publication number: CN213030816U
Application number: CN202020961428.3U
Authority: CN
Inventors: 王明军; 孙杨; 赵金忠; 向冬; 黄裕程; 蒋佳; 董士奎; 燕晓宇; 李亚民; 康育豪
Original assignee: Lixin Shenzhen Medical Devices Co ltd
Current assignee: Lixin Shenzhen Medical Devices Co ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-04-23
Anticipated expiration: 2030-05-29

Abstract

The utility model provides a screw for orthopedics, it adopts the absorbable material preparation, and include: the nail body, the screw cap and the nail head. The nail body is cylindrical, and threads are arranged on the periphery of the nail body; the screw cap is cylindrical, the bottom surface of the screw cap is provided with a round corner, the screw cap is arranged at one end of the nail body and is connected with the nail body through a curved surface, the screw cap is provided with a counter bore which is concave along the height direction, the counter bore is cross-shaped, the center of the counter bore is coaxial with the axis of the nail body, and the outer diameter of the screw cap is larger than that of a thread; the nail head is gradually contracted and is arranged at the other end of the nail body far away from the screw cap. Therefore, the orthopedic screw can be made of absorbable materials, can be implanted into the bone easily and can be fixed better.

Description

Screw for orthopedics

Technical Field

The embodiment relates to the field of medical instruments, in particular to a screw for orthopedics.

Background

With the increase of population and aging, patients with bone defects caused by diseases, accidents and the like are increasing, and the clinical requirements of bone repair treatment are increasing year by year. In the orthopedic repair treatment operation, the damaged bone needs to be fixed by using bone screws, bone fracture plates and other implantation instruments. Accordingly, the demand for bone fixation implant devices has also increased.

The existing bone screw is usually made of metal materials, cannot be absorbed by a human body, and may cause the human body to generate certain rejection in the later period; in addition, the existing bone screws are generally difficult to implant and difficult to fix after being implanted into bones, and the bone screws are easy to withdraw from the bones.

SUMMERY OF THE UTILITY MODEL

The present invention has been accomplished in view of the above-mentioned prior art, and an object of the present invention is to provide an orthopedic screw which is made of an absorbable material, is easy to operate, and can be better fixed inside a bone.

Therefore, the utility model provides an orthopedic screw, a serial communication port, orthopedic screw adopts the absorbable material preparation, orthopedic screw includes: a nail body having a cylindrical shape, the nail body having a thread formed on an outer circumference thereof; the screw cap, it is cylindricly, the bottom surface of screw cap is configured with the fillet, the screw cap sets up the one end of the nail body, the screw cap with the nail body is connected via the curved surface, the screw cap is provided with the counter bore along the direction of height indent, the counter bore is the cross, the center of counter bore with the axle center of the nail body is coaxial, the external diameter of screw cap is greater than threaded external diameter, pin fin, it is and gradually contracts the form and sets up keeping away from the screw cap the other end of the nail body.

The utility model discloses in, orthopedics is with screw adoption absorbable material preparation, and orthopedics is with screw including nail body, screw cap and pin fin. The nail body is cylindrical, and the periphery of the nail body is provided with threads. The screw cap is cylindricly, and the screw cap setting is in the one end of the nail body, and the screw cap is connected via the curved surface with the nail body, and the screw cap is provided with the crisscross counter bore of indent, and the center of counter bore is coaxial with the axle center of the nail body, and the bottom surface of screw cap is disposed the fillet, and the external diameter of screw cap is greater than the external diameter of the nail body. Therefore, the orthopedic screw can be made of absorbable materials, can be implanted into the bone easily and can be fixed better. The screw cap of the orthopedic screw is provided with the concave cross-shaped counter bore, so that the problem that the orthopedic screw is easy to slip when being implanted or screwed out is solved.

In addition, in the screw for orthopedics of the utility model relates to, optionally, the nail body with the screw cap integrated into one piece, the pin fin with the nail body integrated into one piece. Therefore, the separation of the nail body and the screw cap and the separation of the nail body and the nail head can be inhibited in the operation process of the orthopedic screw.

In addition, in the orthopedic screw according to the present invention, optionally, the head is in the shape of a circular truncated cone. Therefore, the injury of the orthopedic screw to the bone tissue can be reduced.

In addition, in the orthopedic screw according to the present invention, optionally, the thread is a thread of a thread type. In this case, the frictional force between the screw for orthopedics and the implanted bone can be increased, whereby the screw for orthopedics can be advantageously fixed inside the bone better.

In addition, in the orthopedic screw according to the present invention, optionally, the crest of the thread has a chamfer. Therefore, the possibility of secondary damage to the bone tunnel caused by the orthopedic screw can be reduced.

In addition, in the orthopedic screw according to the present invention, optionally, the material of the screw body is selected from one of polylactic acid material, polycaprolactone, polydioxanone, and polyglycolic acid, or one of more than two-component random copolymer or block copolymer selected from lactide, caprolactone, polydioxanone, and glycolide. In this case, by manufacturing the screw for orthopedics using the absorbable material, it is possible to effectively suppress not only the occurrence of the secondary operation but also the occurrence of various inconveniences such as the inability to perform nuclear magnetic resonance examination or the occurrence of inflammation such as synovitis, which may be caused by the bone screw remaining in the body.

Additionally, in the orthopedic screw of the present invention, optionally, the screw cap is of a threadless design. In this case, the possibility that the orthopedic screw is too deep in the implantation process can be inhibited, so that the implantation efficiency can be improved, and the corresponding implantation obstruction can be reduced.

In addition, in the orthopedic screw of the present invention, optionally, the thread pitch between two adjacent threads is equal. In this case, the friction force between the orthopedic screw and the bone tissue can be increased, and the orthopedic screw can be conveniently fixed in the bone.

Additionally, in the utility model relates to an in the screw for orthopedics, optionally, the screw thread adopts sawtooth pattern screw thread, the thread cross-section of screw thread is not isosceles trapezoid, the both sides corner of thread is the fillet transition. Thereby, the orthopedic screw can be better fixed inside the bone.

In addition, in the orthopedic screw according to the present invention, optionally, a side angle of the thread on the side of the screw cap away from the screw thread is larger than a side angle of the thread on the side of the screw cap. In this case, the orthopedic screw can be better implanted into the bone, and better fixation of the orthopedic screw in the bone is facilitated.

In addition, in the utility model relates to a screw for orthopedics, optionally, the nail body all is provided with the screw thread from the one end that is close to the pin fin to being close to the one end of screw cap. Thereby, the orthopedic screw can be better fixed inside the bone.

According to the utility model, the orthopedic screw which is made of absorbable material and is convenient to operate and can be better fixed inside the bone is provided.

Drawings

Fig. 1 is a perspective view showing one angle of an orthopedic screw according to an embodiment of the present invention.

Fig. 2 is a perspective view illustrating another angle of the orthopedic screw according to the embodiment of the present invention.

Fig. 3 is a sectional view showing an orthopedic screw according to an embodiment of the present invention.

Fig. 4 is a partial sectional view showing a part of fig. 3 according to an embodiment of the present invention.

Fig. 5 is a partial sectional view showing another part of fig. 3 according to the embodiment of the present invention.

Fig. 6 is a front view of a screw cap of an orthopedic screw according to an embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.

It is noted that the terms "comprises," "comprising," and "having," and any variations thereof, in the present disclosure, such that a process, method, system, article, or apparatus that comprises or has a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include or have other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In bone surgery, it is often necessary to fix a fracture site (also referred to as "damaged bone") with bone screws. The utility model provides a screw for orthopedics (also called bone screw). The utility model discloses in, orthopedics is with screw adoption absorbable material preparation to can implant inside the bone and can be better fixed comparatively easily, and can be absorbed the emergence that restraines the secondary operation by the human body after implanting.

Fig. 1 is a perspective view showing one angle of an orthopedic screw 10 according to the present embodiment.

The utility model provides a screw 10 for orthopedics, which is made of absorbable material and comprises a screw body 110, a screw cap 120 and a screw head 130. The nail body 110 may be cylindrical, and a thread is provided on the outer circumference of the nail body 110; the screw cap 120 may be cylindrical, the bottom surface of the screw cap 120 may be configured with a rounded corner, the screw cap 120 is disposed at one end of the screw body 110, the screw cap 120 may be connected with the screw body 110 via a curved surface, the screw cap 120 is provided with a counter bore 121 (see fig. 2) recessed along a height direction, the counter bore 121 may be cross-shaped, the center of the counter bore 121 may be coaxial with the axis of the screw body 110, the outer diameter of the screw cap 120 is greater than the outer diameter of a thread, and the nail head 130 may be gradually contracted and disposed at the other end of the screw body away from the screw cap 120.

In the present invention, as mentioned above, the orthopedic screw 10 may be made of absorbable material, and the orthopedic screw 10 may include a screw body 110, a screw cap 120 and a screw head 130. The nail body 110 may have a cylindrical shape, and a screw thread may be provided on the outer circumference of the nail body 110. The screw cap 120 may be cylindrical, the screw cap 120 is disposed at one end of the nail body, the screw cap 120 is connected to the nail body 110 via a curved surface, the screw cap 120 is provided with an inwardly concave cross-shaped counterbore 121, the center of the counterbore 121 is coaxial with the axis of the nail body 110, the bottom surface of the screw cap 120 is configured with a rounded corner, and the outer diameter of the screw cap 120 is greater than the outer diameter of the nail body 110. Therefore, the orthopedic screw 10 can be made of an absorbable material, and the orthopedic screw 10 can be implanted into a bone easily and can be fixed better. The screw cap 120 of the orthopedic screw 10 is provided with the concave cross-shaped counter bore, so that the problem that the orthopedic screw 10 is easy to slip when being implanted or screwed out is solved.

Fig. 2 is a perspective view showing another angle of the orthopedic screw 10 according to the present embodiment.

In the present embodiment, as shown in fig. 1 and 2, the bone screw 10 according to the present embodiment may include a shank 110 and a screw cap 120, and the screw cap 120 may be provided at one end of the shank 110.

In some examples, the shank 110 may be integrally formed with the screw cap 120. In this case, the shank 110 and the screw cap 120 are formed as one body, whereby it is possible to avoid the shank 110 and the screw cap 120 from being separated from each other during the operation of the bone screw 10, thereby avoiding the possibility of the bone screw 10 slipping off due to the separation and improving the reliability of the bone screw 10.

In some examples, the tack body 110 may be elongated. In some examples, the shank 110 may be cylindrical. Thus, the nail body 110 can be in different shapes according to different application scenes.

In some examples, the outer circumference of the shank 110 may be provided with threads. In some examples, as shown in fig. 1-2, the thread may be distributed throughout the nail body 110, i.e., the nail body 110 may be provided with threads from an end near the nail head 130 to an end near the screw cap 120, i.e., a portion of the outer circumference of the nail body 110 provided with threads may be equal to the length of the nail body 110. Thereby, the orthopaedic screw 10 can be better fixed inside the bone. In other examples, the portion of the nail body 110 provided with threads on the outer circumference may be less than or equal to the length of the nail body 110, and the ratio of the length of the portion of the nail body 110 provided with threads on the outer circumference to the length of the nail body 110 may be 0.8-1. For example, the ratio of the length of the portion of the outer circumference of the shank 110 provided with the thread to the length of the shank 110 may be 0.8, 0.85, 0.9, 0.95, 0.99, 1, or the like. In this case, the orthopaedic screw 10 can be made to better fit different damaged bones, such as may be applied in cortical bone.

Fig. 3 is a sectional view showing an orthopedic screw 10 according to an embodiment of the present invention. Fig. 4 is a partial sectional view showing a part (region a) of fig. 3 according to the embodiment of the present invention.

In some examples, the threads on the shank 110 may be a thread type. In this case, the frictional force between the screw 10 for orthopedics and the implanted bone can be increased, whereby better fixation of the screw 10 for orthopedics inside the bone can be facilitated.

In some examples, as shown in fig. 3 and 4, the crests of the threads on the shank 110 may have chamfers. This reduces the possibility of secondary damage to the bone tunnel caused by the orthopedic screw 10. In some examples, the chamfer of the crest of the thread provided at the outer periphery of the nail body 110 may be flat-top type or dome type.

In the present embodiment, as shown in fig. 3 and 4, the thread on the nail body 110 may be a zigzag type thread, and the cross section of the thread (for example, the thread 111a and the thread 111b) may be an unequal waist trapezoid. In some examples, the threads are rounded at both side corners (e.g., at a and b). In this case, the thread is not easily bent or broken, is not easily worn, and can be tightly pressed against the bone tunnel implanted in the bone, thereby enabling the orthopedic screw 10 to be better fixed inside the bone. For example, as shown in fig. 4, the crest of the thread has rounded corners (e.g., at a and b).

In some examples, the flanks of the threads on the shank 110 may be arcuate. However, examples of the present invention are not limited thereto, and in some examples, the flanks of the threads of the thread may be beveled.

In some examples, as shown in fig. 3 and 4, the two side corners (see c and d in fig. 4) where the root of the thread on the shank 110 connects with the thread may be connected via a curved surface.

In some examples, as shown in fig. 3 and 4, the root of the thread on the shank 110 (except for the corners at both sides where the root and the thread are connected) may be horizontal parallel to the axis L of the shank. However, the present invention is not limited thereto, and in some examples, the thread of the nail body 110 may have an inwardly concave arc shape.

In some examples, as shown in fig. 3 and 4, the flank angle (e.g., flank angle α) of the thread on the side of the thread distal from the screw cap 120 may be greater than the flank angle (e.g., flank angle β) on the side proximal to the screw cap. In this case, the thread on the nail body 110 may be formed in a barb shape, enabling better implantation of the orthopedic screw 10 into the bone and facilitating better fixation of the orthopedic screw 10 in the bone.

In some examples, the profile angle (i.e., the sum of flank angle α and flank angle β) of the threads may be 20-60 °. In some examples, the flank angle (e.g., flank angle α) of the threads on the side of the threads distal from the nut 120 may be 15-35 ° in magnitude, and the flank angle (e.g., flank angle α) of the threads on the side of the threads proximal to the nut 120 may be 5-25 ° in magnitude.

However, the present invention is not limited to this, and in some examples, the thread on the nail body 110 may be a sawtooth thread, the thread cross section of the thread may be an isosceles trapezoid, and the thread angle of the thread may be 30 to 60 °.

In other examples, the thread may also be provided as a round root constant pitch unified thread (UNR thread), a round root coarse series unified thread (UNRC), a round root fine series unified thread (UNRF), a round root ultra fine series unified thread (UNREF), or a round root special series unified thread (UNRs).

In other examples, the thread may also be a standard coarse huh series, a standard english standard BS84 english thread with 55 angles (b.s.w.) a standard fine huh series, a general purpose cylindrical thread (b.s.f.), an additional optional huh series, a general purpose cylindrical thread (whit.s), a non-standard thread of huh type (Whit), a uniform thread of constant pitch (UN), a uniform thread of coarse series (UNC), a uniform thread of fine series (UNF), a uniform thread of ultra fine series (UNEF), or a uniform thread of special Series (UNs). In this case, different threads may be selected according to different use environments, thereby enabling bone screw 10 to accommodate different application scenarios.

In some examples, the threads on the shank 110 may be such that the pitch between adjacent threads is equal. In this case, the frictional force between the screw 10 for orthopedics and the bone tissue can be increased, and the fixation of the screw 10 for orthopedics inside the bone can be facilitated. However, the present invention is not limited to this, and the screw thread on the nail body 110 may also satisfy that the closer the pitch between two adjacent screw threads is to the screw cap 120, the larger.

In some examples, the thread heights of two adjacent ones of the threads on the shank 110 (i.e., half the difference between the outer diameter and the inner diameter of the shank 110) may be equal.

In some examples, the thread height of the shank 110 may be 1/6-1/3 of the inner diameter of the shank 110. For example, the thread height of the shank 110 may be 1/6, 1/5, 1/4, 1/3, or the like, which is the size of the inner diameter of the shank 110.

In some examples, the widths of the threads in the threads on the shank 110 (e.g., the intervals a and b in fig. 3) may be equal.

In some examples, as shown in fig. 1 to 3, one end of the shank 110 may be connected with the screw cap 120, and the other end may be connected with the head 110.

In some examples, the orthopedic screw 10 can include a screw cap 120, and the screw cap 120 can be disposed at one end of the nail body 110.

Fig. 5 is a partial sectional view showing another portion (region B) in fig. 3 according to the embodiment of the present invention. Fig. 6 is a front view showing a screw cap 120 of the orthopedic screw 10 according to the embodiment of the present invention.

In some examples, as shown in fig. 3 and 5, the screw cap 120 and the nail body 110 may be connected via a curved surface (see, in particular, a in fig. 5).

In some examples, as shown in fig. 1 and 2, the screw cap 120 may be cylindrical. Thereby, the screw cap 120 can be better matched with the nail body 110, and the bone screw 10 can be implanted into the bone more easily.

In some examples, the outer diameter of the screw cap 120 may be greater than the outer diameter of the shank 110. In some examples, the outer diameter of the screw cap 120 may be greater than the outer diameter of the threads on the shank 110. The possibility of the bone screw 10 being implanted too deeply during implantation can thereby be effectively suppressed.

In some examples, as shown in FIGS. 2 and 6, the screw cap 120 may be provided with a counterbore 121 that is recessed in the height direction. In some examples, a counterbore 121 may be disposed on a side of the screw cap 120 away from the nail body 110, and the counterbore 121 may take the form of one of a recessed quincunx, a trident, a triangle, a square, a hexagon, a cross, or the like. Implantation of the bone screw 10 into the bone can thereby be facilitated. Preferably, as shown in FIGS. 1 and 6, the nut 120 may be provided with an inwardly concave cruciform counterbore 121. In other examples, counterbore 121 may be compounded from a variety of shapes. In this case, the bone screw 10 has both good mechanical properties to make it easier to implant into bone and to improve the problem of the bone screw 10 being susceptible to thread slippage when implanted or unscrewed.

In some examples, the center of the recessed counterbore 121 provided in the screw cap 120 may be located on the axis L of the nail body 110, such as the bone screw 10 in fig. 2 and 5, and the center 121a of the recessed cross-shaped counterbore 121 provided in the screw cap 120 may be located on the axis L of the nail body 110. In this case, a higher reliability of the bone screw 10 can be achieved.

In some examples, the counterbore 121 provided on the screw cap 120 may be formed by being recessed along the axis L. In some examples, the screw cap 120 may be cross-shaped with the recessed counterbore 121. Specifically, as shown in fig. 2 and 5, counterbore 121 may include a counterbore surface 121b, a counterbore bottom surface 121c, and a counterbore wall surface 121d, counterbore surface 121b also being a screw cap bottom surface 122, counterbore bottom surface 121c being a surface concavely formed in screw cap 120, counterbore bottom surface 121c being parallel to counterbore surface 121b, and counterbore wall surface 121d being perpendicular to counterbore bottom surface 121c or counterbore surface 121 b. In some examples, the corner of the counterbore 121 of the screw cap 120 that connects to the bottom surface 122 of the screw cap may be rounded. In some examples, as shown in fig. 6, the counterbore 121 may be divided into 4 regions, for example, a region a, a region b, a region c and a region d, wherein, as shown in fig. 2 and 6, the counterbore wall surface in the region a is vertically arranged, and the regions b, c and d are also the same as the region a, and each has a counterbore wall surface vertically arranged.

In some examples, the bottom surface of the screw cap 120 is configured with rounded corners. Specifically, referring to fig. 5 at b and c, the two corners of the screw cap 120 where the bottom surface and the side surface are connected may have rounded transitions.

In some examples, the screw cap 120 may be of a threadless design, i.e., the screw cap 120 is unthreaded. In this case, the possibility of the bone screw 10 being implanted too deeply during implantation can be suppressed, whereby the implantation efficiency can be improved and the corresponding implantation hindrance can be reduced.

In some examples, as shown in fig. 1, bone screw 10 may further include a head 130 coupled to shank 110. In some examples, the head 130 may be disposed at the other end of the shank 110 away from the screw cap 120, for example, as shown in fig. 1, the head 130 may be connected with one end of the shank 110. In this case, the maximum outer diameter of the head 130 may be equal to the inner diameter of the shank 110. Thereby enabling a better match of the head 130 and the shank 110.

In some examples, tack head 130 may be integrally formed with tack body 110. In this case, the head 130 is formed integrally with the shank 110, whereby it is possible to avoid separation of the head 130 and the shank 110 from each other during operation of the bone screw 10, thereby avoiding a possibility of slipping off of the bone screw 10 due to the separation and improving reliability of the bone screw 10. In some examples, the head 130 may be tapered, and the head 130 may be tapered in a direction away from the nut 120. Thereby, implantation of the bone screw 10 into the bone can be facilitated.

In some examples, the stud 130 may be frustoconical. Thereby reducing the damage of the bone tissue by the orthopedic screw 10. In some examples, the head of the head 130 distal to the nut 120 may be spherical, and the shank of the head 130 other than the head may be frustoconical or tapered. In other examples, stud 130 may be tapered.

In some examples, stud 130 may be of a threadless design, i.e., no threads on stud 130.

In some examples, the material of bone screw 10 may be selected from one of a polylactic acid-based material, polycaprolactone, polydioxanone, and polyglycolic acid. In other examples, the material of bone screw 10 may be selected from one of more than two random or block copolymers of lactide, caprolactone, p-dioxanone, and glycolide.

In the present embodiment, by using the bone screw 10 made of the above-described material, not only the secondary removal operation can be avoided, but also inconvenience caused by leaving the bone screw 10 made of a material that is not absorbed into the human body, such as metal, in the body, such as failure of nuclear magnetic resonance examination, inflammation such as synovitis, and the like, can be avoided.

While the present invention has been described in detail in connection with the drawings and the examples, it is to be understood that the above description is not intended to limit the present invention in any way. The present invention may be modified and varied as necessary by those skilled in the art without departing from the true spirit and scope of the invention, and all such modifications and variations are intended to be included within the scope of the invention.

Claims

1. The orthopedic screw is characterized in that the orthopedic screw is made of absorbable material,

the orthopedic screw comprises:

a nail body having a cylindrical shape, the nail body having a thread formed on an outer circumference thereof;

a screw cap which is cylindrical, the bottom surface of the screw cap is configured with a round angle, the screw cap is arranged at one end of the nail body, the screw cap is connected with the nail body through a curved surface, the screw cap is provided with a counter bore which is concave along the height direction, the counter bore is cross-shaped, the center of the counter bore is coaxial with the axle center of the nail body, the outer diameter of the screw cap is larger than the outer diameter of the screw thread,

the nail head is gradually contracted and is arranged at the other end of the nail body far away from the screw cap.

2. The orthopedic screw of claim 1,

the nail head is in a round table shape.

3. The orthopedic screw of claim 1,

the threads are thread-type threads.

4. The orthopedic screw of claim 1,

the crests of the threads have chamfers.

5. The orthopedic screw of claim 1,

the absorbable material is selected from one of polylactic acid materials, polycaprolactone, polydioxanone and polyglycolic acid, or one of more than two-component random copolymers or block copolymers selected from lactide, caprolactone, polydioxanone and glycolide.

6. The orthopedic screw of claim 1,

the screw cap is designed without threads.

7. The orthopedic screw of claim 1,

the thread pitches between two adjacent threads are equal.

8. The orthopedic screw of claim 1,

the thread adopts sawtooth type thread, the thread cross-section of thread is not isosceles trapezoid, the both sides corner of thread is the fillet transition.

9. The orthopedic screw of claim 1,

the flank angle of the thread on the side of the thread far away from the screw cap is larger than the flank angle on the side of the thread close to the screw cap.

10. The orthopedic screw of claim 1,

the screw body is provided with screw threads from one end close to the screw head to one end close to the screw cap.