CN117462229B

CN117462229B - Interface screw assembly

Info

Publication number: CN117462229B
Application number: CN202311809816.4A
Authority: CN
Inventors: 刘丽娜; 潘兵辉; 张忠英
Original assignee: Hongxin Kechuang Biotechnology Beijing Co ltd
Current assignee: Hongxin Kechuang Biotechnology Beijing Co ltd
Priority date: 2023-12-26
Filing date: 2023-12-26
Publication date: 2024-03-08
Anticipated expiration: 2043-12-26
Also published as: CN117462229A

Abstract

The utility model provides an interface screw assembly, including nail body external member and filler, nail body external member comprises a plurality of nail sections that can follow the concatenation of axial head and the tail, every be formed with the hole that link up each other in the nail section, the filler comprises a plurality of filling blocks of following axial head and the tail connection, connects each other through the weak portion between the adjacent filling block, every the axial cross-section shape of filling block with the hole matches. According to the method, a plurality of nail segments matched in size can be selected according to the size of the tissue to be operated and spliced end to end, the filler can drive the nail segments to be screwed by inserting the filler into the inner holes of the nail segments, and after the filler is screwed in place, the filling blocks connected end to end are separated at the corresponding weak parts through external force, so that the requirements that one set of interface screw assembly is applicable to different sizes of the tissue to be operated are met.

Description

Interface screw assembly

Technical Field

The present disclosure relates to the field of medical devices, and more particularly to an interface screw assembly.

Background

The interface screw is mainly used for fixing bone parts after fracture, bone fracture or osteotomy to promote bone healing and recovery, and especially in anterior cruciate ligament injury repair operation, the requirements on mechanical strength, screwing operability and fixing stability of the interface screw are higher, and meanwhile, the requirement on the cutting damage of the interface screw to tendons is avoided. The interface extrusion screw that patent ZL202121430101.4 disclosed is provided with from the cutting nail, extrusion nail and revolve and twist the nail, from the cutting nail with revolve and twist the nail screw connection, extrusion nail and revolve and twist the nail free rotation and be connected to avoid extrusion nail external screw thread to produce the cutting damage to the tendon when extrusion tendon. The hollow interface nail disclosed in the patent ZL201620131901.9 is provided with a nail body, a nail head and a support rivet, the support rivet is inserted into the inner end of the nail head to realize support locking on the nail head, and the hollow nail body structure is used for avoiding cutting damage to tendons. However, for degradable interface screws, in some occasions, it is hoped that the degradation period of the interface screws is properly prolonged, the outer surface and the inner surface of the hollow interface screw in the prior art can be degraded by tissue fluid at the same time, the purpose of prolonging the degradation period cannot be met, meanwhile, the problem of the flexibility of the size of the interface screws required by performing operations on tissues with different sizes is not solved in the prior art, an operator needs to select the interface screws with corresponding sizes according to the sizes of the tissues to be operated, the preparation and the process of the operation are complicated, and the purchase cost of the surgical instrument is high.

Disclosure of Invention

The present disclosure provides an interface screw assembly.

Specifically, the present disclosure is implemented by the following technical scheme:

embodiments of the present disclosure provide an interface screw assembly comprising:

the nail body sleeve comprises a plurality of nail sections which can be spliced end to end along the axial direction, threads are formed on the outer surface of each nail section, and inner holes which are mutually communicated are formed in each nail section;

the filler consists of a plurality of filling blocks which are connected end to end along the axial direction, and the adjacent filling blocks are connected with each other through weak parts;

wherein, the axial cross section shape of each filling block is matched with the inner hole, so that the filling blocks can drive the nail segments to be screwed in the state that the filling blocks are inserted into the inner holes of the nail segments.

In some embodiments, the cross-sectional shape of the bore and the filler block are both regular polygons.

In some embodiments, the distal center of the filler piece, where the filler is located at the most distal end, is provided with a post.

In some embodiments, the thread crests are formed as arcuate transitions.

In some embodiments, a cap is provided at the distal end of the staple segment of the staple body assembly at the most distal end, the cap having a core hole formed in the center thereof for the post to pass through and protrude out of the core hole.

In some embodiments, at least a portion of the staple segments of the staple body assembly have an axial dimension in an axially end-to-end splice condition that is less than an axial dimension of at least a portion of the filler mass of the filler.

In some embodiments, the distal end of the staple segment of the staple body assembly that is located furthest from forms a planar end surface.

In some embodiments, the weaknesses decrease in radial dimension perpendicular to the axial direction.

In some embodiments, the filler is screwed using a tool that forms a cavity having an axial dimension that is at least greater than the axial dimension of the filler block at the most proximal end of the filler.

In some embodiments, the staple segment surface forms a corrosion resistant treatment layer.

According to the embodiment, the nail body sleeve comprises a plurality of nail segments, a plurality of nail segments matched in size can be selected according to the size of the tissue to be operated, the nail segments are spliced end to end, the filler is inserted into the inner holes which are communicated with each other, the filler is matched with the shape of the inner holes, the filler drives the plurality of nail segments to be screwed into the tissue, meanwhile, the inner holes are filled with the filler, and the inner surfaces of the nail segments are prevented from being degraded by tissue liquid as much as possible; after screwing in place, the filling blocks connected end to end are separated at the corresponding weak parts through external force, so that the filling blocks in the inner hole are sufficiently filled to block tissue fluid from entering, the length of the filling blocks outside the inner hole is proper, the freedom degree of movement of a patient and the operation of surgical suture are not influenced, and the requirements that one set of interface screw assembly is applicable to different tissue sizes to be operated are met.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic representation of an installation tool of an interface screw assembly in an embodiment of the present disclosure;

FIG. 2 is an exploded schematic view of a staple body kit in an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of a staple body kit in an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of a filler in an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view of a filler in an embodiment of the present disclosure;

fig. 6 is a cross-sectional view of an interface screw assembly in a filled state in an embodiment of the present disclosure.

Reference numerals:

10: a nail body sleeve; 11: a staple section; 12: a thread; 13: an inner bore; 14: a cover portion; 15: a core hole; 16: a flat end surface;

20: a filler; 21: filling blocks; 22: a weak portion; 23: a convex column;

30: a tool; 31: a cavity.

Detailed Description

The present disclosure will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only in order to enable a person of ordinary skill in the art to better understand and thus practice the present disclosure, and are not meant to imply any limitation on the scope of the present disclosure.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms; the terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment"; the term "another embodiment" is to be interpreted as "at least one other embodiment"; the terms "first," "second," and the like, may refer to different or the same object; the term "disposed" is not limited to a direct connection or an indirect connection, nor to a particular manner of connection. Other explicit and implicit definitions are also possible below.

Some specific values or ranges of values may be referred to in the following description. It should be understood that these numerical values and numerical ranges are merely exemplary, which may be advantageous to put the concepts of the present disclosure into practice. However, the description of these examples is not intended to limit the scope of the present disclosure in any way. These values or ranges of values may be set otherwise, depending on the particular application and requirements.

As described above, in the prior art, when performing a surgical operation, a plurality of interface screws with different length sizes must be prepared in advance, and during the surgical operation, the matched interface screws are selected according to the size of the tissue of the patient, which results in complicated surgical preparation process and complicated process of selecting the matched interface screws. According to the interface screw assembly, a plurality of interface screws with different length sizes are not required to be prepared, operation preparation time is simplified, complex operation of repeatedly selecting and replacing the interface screws in an operation process is avoided, meanwhile, inner holes of nail segments are fully filled, tissue fluid is prevented from entering the inner holes, and interface screw degradation time is prolonged. The structure and the working principle of the interface screw assembly according to the embodiment of the present disclosure will be described in detail with reference to fig. 1 to 6, and for clarity of explanation, the structure and the working principle of the interface screw assembly according to the embodiment of the present disclosure will be described by taking the artificial ligament implantation operation of the knee joint as an example, however, the interface screw assembly according to the embodiment of the present disclosure is not limited to the artificial ligament implantation operation of the knee joint, and is also applicable to tissue operations of other parts.

As shown in fig. 1, the interface screw assembly of the embodiment of the present disclosure generally includes a nail body kit 10 for drilling into knee joint bone and compressing and fixing artificial ligaments in the bone, and a filler 20 for plugging from inside the nail body kit 10 to prevent tissue fluid from entering, ensuring that the inner surface of the nail body kit 10 is degraded and corroded. In practice, the tool 30 is used to drive the nail body kit 10 and the filler 20 in rotation, and the tool 30 may be a screwdriver, for example, or the tool 30 may be a crank-screwing tool 30 or a power-screwing tool 30, for example.

The nail segment 11 and the filling block 21 of the embodiment of the present disclosure are prepared from degradable materials, such as degradable medical polymer materials, synthetic degradable materials, degradable biological ceramic materials, degradable medical metal materials, degradable medical composite materials, and the like, and illustratively, degradable magnesium-based alloys, zinc-based alloys, iron-based alloys, and the like, or degradable polyurethane, polyester, polylactic acid, and the like.

The nail body kit 10 of the embodiment of the disclosure is composed of a plurality of nail segments 11, wherein at least two types of nail segments 11 are included, one type of nail segment 11 is used for being spliced end to end at the most distal end, the other type of nail segment 11 is used for being spliced end to end at the middle part and the most proximal end, and any number of nail segments 11 with axial length sizes can be selected for combination in the use process, so that the axial sizes required by flexible matching are realized. In this description, "distal" in this application refers to the direction of drilling into the knee joint, and "proximal" refers to the direction opposite to the direction of drilling into the knee joint. As shown in fig. 2 and 3, the outer surface of each nail segment 11 in the nail body sleeve 10 of the embodiment of the disclosure forms a thread 12, and parameters such as a thread rotation direction, a thread pitch, a thread height, a thread diameter and the like are consistent, so that the consistent drilling speed of the whole nail body sleeve 10 in bones can be ensured no matter which nail bodies are spliced and used end to end along the axial direction.

In one embodiment, the thread 12 is formed with a rounded transition at the top to avoid damage to the ligament and the pull wire during the drilling of the nail segment 11 due to cutting using thread shapes such as trapezoidal threads, zigzag threads, and the like.

In order to ensure that the artificial ligament can be squeezed between the outer surface of the nail segment 11 and the inner wall of the knee joint drill hole after the nail segment 11 is screwed into the knee joint, the embodiment of the disclosure forms an inner hole 13 in each nail segment 11, and for one type of nail segment 11 spliced end to end at the most distal end, the inner hole 13 axially penetrates through the nail segment 11 but is closed at the distal end by a cover part 14, so that bone tissue particles can not be blocked in the inner hole 13 in the process of the nail segment 11 entering the knee joint, and the filler 20 can not be smoothly inserted into the inner hole 13; for a type of nail section used for splicing the middle part and the nearest end at the head and the tail, the inner hole 13 penetrates through the nail section 11 along the axial direction and is opened at the two ends, so that the plurality of nail sections 11 after being spliced and combined form the completely through inner hole 13.

As shown in fig. 4 to 5, the packing 20 of the embodiment of the present disclosure is composed of a plurality of packing blocks 21, and the plurality of packing blocks 21 are connected end to end in the axial direction, thereby forming a packing 20 in a rod shape or a bar shape as a whole, and the sectional shape and size of each packing block 21 are substantially uniform, so that the packing 20 as a whole is formed in a rod shape with equal cross section. By way of example, the cross-sectional shape may be a regular polygon such as a regular pentagon, a regular hexagon, etc., to balance the torsional force transmission process.

In one embodiment, to ensure that the filler block 21 can transmit torsional forces to the staple segment 11, the bore 13 of the staple segment 11 is formed to match the shape of the bore 13 of the filler block 21. The cross-sectional shape of the inner hole 13 of the nail segment 11 can be completely the same as that of the filling block 21, and the cross-sectional shapes of the inner hole 13 and the filling block 21 are regular hexagons in an exemplary manner, so that the filling block 21 fully covers the inner hole inner wall of the nail segment 11 in the whole circumferential direction, and the inner hole inner wall is prevented from being corroded and degraded by tissue fluid.

In one embodiment, the filling block 21 is in interference fit with the inner hole 13 of the nail section 11, so that the filling block 21 can play a role in outwards expanding the nail section 11, and further the outer surface of the nail is ensured to squeeze the artificial ligament. In another embodiment, a transition fit between the filling block 21 and the inner bore 13 of the nail segment 11 may be used, so long as the inner wall of the inner bore 13 is kept from contacting with the tissue fluid as much as possible.

In one embodiment, taking a regular hexagon as an example, the connection between two adjacent packing blocks 21 is formed to be reduced in radial dimension, thereby forming the weak portion 22 in strength, and the packing 20 can be easily separated at the weak portion 22 by applying an external force. The weak portion 22 may take other forms, and the weak portion 22 may be formed with a plurality of radial cuts in advance, or the filler block 21 may be bonded with a low-strength adhesive, as long as the local strength is ensured to be lower than that of the filler block 21, for example.

In one embodiment, the external force applied to the weakened portion 22 may be in the form of a bending force, a radial cutting by a cutter, or a twisting force.

In one embodiment, the end of the nail section 11 for the most distal end is closed by providing the cover part 14, the core hole 15 is formed in the center of the cover part 14, correspondingly, the center of the end of the filling block 21 for the most distal end of the filler 20 is provided with a convex column 23, and the convex column 23 is matched with the core hole 15 and is used for guiding the filler 20 during the process of inserting the filler 20 into the inner hole 13, so as to prevent the filler 20 from being blocked due to deflection during the process of inserting the filler 20 into the inner hole 13 or accidentally cause the filler 20 to be broken at the weak part 22.

The staple body kit 10 of the embodiments of the present disclosure is composed of a plurality of staple segments 11, wherein the axial dimensions of each staple segment 11 may be identical or different; accordingly, the packing 20 is composed of a plurality of packing blocks 21 connected end to end in the axial direction, and the axial dimensions of each packing block 21 may be identical or different. That is, the axial dimension of each staple segment 11 and the axial dimension of each filler block 21 are not particularly limited, but the spliced and combined staple body kit 10 is ensured to have an axial dimension smaller than that of the filler 20, so that the filler 20 can extend from the proximal end of the staple body kit 10 by a distance to facilitate screwing the filler 20 with the tool 30 or separating the filler 20 outside the staple body kit 10.

In one embodiment, the end of the tool 30 is formed with a cavity 31, and the cavity 31 is formed with the same or different cross-sectional shape as the filler piece 21, so long as the torsional force can be transmitted to the filler piece 21 through the cavity 31. In another embodiment, the axial dimension of the cavity 31 is set to be larger so as to enable the cavity 31 to relatively move along the axial direction along a large range relative to the filler 20, thereby improving the operation flexibility of the tool 30, and in an exemplary embodiment, the axial dimension of the cavity 31 can be at least larger than the axial dimension of the filler 21 positioned at the nearest end of the filler 20, so that the cavity 31 can span the nearest weak portion 22 by adjusting the axial position of the cavity 31, and the bending separation operation can be performed on the second last weak portion 22 at the nearest end.

In one embodiment, the distal end of the staple segment 11 for the distal end forms a planar end surface 16 so that the distal-most staple segment 11 is in stable contact with the knee joint bore hole floor by virtue of the planar end surface 16.

In one embodiment, because the artificial ligament of the knee joint has a long growth cycle, that is, the nail section 11 has a long retention time in the body, the degradation rate of the nail section 11 is delayed by forming an antiseptic treatment layer on the surface of the nail section 11, so that the high-quality growth of the artificial ligament is ensured.

The following describes a method for using the interface screw assembly according to the embodiment of the present disclosure, and the specific steps are as follows:

s1, preparing a drill hole on a knee joint in advance by adopting a drilling tool;

s2, implanting the artificial ligament into the drill hole through the stay wire;

s3, selecting a plurality of nail segments 11 with proper axial dimensions for head-to-tail splicing according to the drilling depth, and exemplarily selecting three nail segments 11 for splicing, wherein the axial dimensions of the three nail segments 11 are L1, L2 and L3 respectively;

s4, selecting a filler 20 with a proper axial size to pass through the through inner holes 13 among the nail segments 11 so as to splice and fix the nail segments 11, and selecting four filler blocks 21 with the axial sizes of M1, M2, M3 and M4 respectively in an exemplary manner;

s5, screwing the filler 20 by using a tool 30, so as to drive the nail section 11 to drill into the bottom of the deep hole, and enabling the end face of the most distal nail section 11 to press the stay wire and the artificial ligament at the bottom of the deep hole;

s6, continuously pushing the filler 20 to the far end through external force in the inner hole 13 until the furthest end of the filler 20 is inserted into the bottom of the inner hole 13 of the nail section 11, and at the moment, the filler 20 plugs the inner hole 13 of the nail section 11, or outwards Zhou Chengkai the nail section 11 through interference fit, so that the nail section 11 can tightly press the artificial ligament and the pull wire on the outer surface of the nail section 11 on the inner wall of the deep hole;

s7, the tool 30 moves to a proper position relative to the filler 20 along the axial direction, as shown in FIG. 6, and at the moment, L1+L2+L3< M1+M2+M3, therefore, the weak part 22 at the position A extends out of the nail section 11, and the filler 20 is broken off from the weak part 22 at the position A by using external force, so that the interface screw mounting work is conveniently and quickly completed.

Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The description of the preferred embodiments will refer to combinations of features, which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. An interface screw assembly, comprising:

the nail body sleeve (10) consists of a plurality of nail segments (11) which can be spliced end to end along the axial direction, threads (12) are formed on the outer surface of each nail segment (11), and inner holes (13) which are mutually communicated are formed in each nail segment (11);

the filling material (20) consists of a plurality of filling blocks (21) which are connected end to end along the axial direction, wherein adjacent filling blocks (21) are connected with each other through weak parts (22), and a convex column (23) is arranged in the center of the far end of the filling block (21) which is positioned at the far end of the filling material (20);

wherein, the axial section shape of each filling block (21) is matched with the inner hole, so that the filling block (20) can drive the nail section (11) to be screwed in a state that the filling block (20) is inserted into the inner hole (13) of the nail section (11), and the axial dimension of the nail body sleeve (10) after the splicing combination is smaller than the axial dimension of the filling block (20);

the distal end of the nail section (11) of the nail body sleeve (10) at the most distal end is provided with a cover part (14), and a core hole (15) is formed in the center of the cover part (14) so as to be suitable for the convex column (23) to penetrate through and extend out of the core hole (15).

2. Interface screw assembly according to claim 1, characterized in that the cross-sectional shape of the inner bore (13) and the filler block (21) are both regular polygons.

3. The interface screw assembly of claim 1, wherein the thread (12) top is formed as a rounded transition.

4. Interface screw assembly according to claim 1, characterized in that at least part of the staple segments (11) of the staple body sleeve (10) have an axial dimension in an axially end-to-end splice state that is smaller than the axial dimension of at least part of the filling blocks (21) of the filler (20).

5. Interface screw assembly according to claim 1, characterized in that the distal end of the staple segment (11) of the staple body sleeve (10) located at the most distal end forms a planar end surface (16).

6. Interface screw assembly according to claim 1, characterized in that the weakening (22) is reduced in radial dimension perpendicular to the axial direction.

7. Interface screw assembly according to claim 1, characterized in that the filler (20) is screwed with a tool (30), the tool (30) being formed with a cavity (31), the axial dimension of the cavity (31) being at least greater than the axial dimension of the filler block (21) of the filler (20) at the nearest end.

8. The interface screw assembly of claim 1, wherein: and an anti-corrosion treatment layer is formed on the surface of the nail section (11).