Hammer-shaped toe screw anti-rotation system

Abstract

The utility model discloses a hammer toe screw anti-rotation system which comprises a screw body and a locking screw, the screw body comprises a screw head and a screw rod which are fixedly connected, and two opposite first notches and two opposite second notches are formed in the peripheral wall of the screw head; the nail head is provided with an open groove penetrating through the two first notches in the radial direction, the open groove extends from the top end of the nail head to the nail rod, and the locking screw is installed on the nail head through holes penetrating through the two second notches. Due to the arrangement of the two first notches and the two second notches in the nail head, the whole nail head is of a rectangular pyramid structure, and the nail body can be effectively prevented from rotating; the radially through slot is extruded during implantation to enable the nail head to contract, the nail head is easier to implant, the nail head parts on the two sides of the slot are bounced off after implantation, the inner wall of the phalanx is tightly pressed, the nail is not prone to retreating, the anti-rotation system of the hammer-shaped toe screw is promoted to be fused with the phalanx, and the fixing stability is improved; the locking screw can effectively prevent rotation, so that the nail main body and the phalanx are fused, and the stable fixity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a hammer toe screw anti-rotation system. Background Art

[0002] Hammer toe generally refers to a deformity in which the proximal interphalangeal joint of the toe is flexed and contracted, the metatarsophalangeal joint remains in a hyperextension state, and is sometimes accompanied by dislocation, and the distal interphalangeal joint is neutral or dorsiflexed. In clinical practice, open reduction and Kirschner wire fixation or screw fixation are generally used to correct hammer toe.

[0003] Although the Kirschner wire fixation method is simple, the fusion of the joint surface is unstable and prone to rotation and displacement, and the surgical treatment effect is not ideal. Moreover, the Kirschner wire is exposed to the outside of the body after the operation, which is prone to secondary infection. After healing, a second surgery is still required to remove the implant.

[0004] The structure of the screw for correcting hammer toe in the prior art generally includes a screw head and a screw body, the outer periphery of the screw body is provided with threads, and the screw head is a blade or thread design, etc., and its anti-rotation and anti-slip effects are not ideal, which affects the reduction and fixation. Utility Model Content

[0005] The purpose of the present application is to provide a hammer toe screw anti-rotation system to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] The purpose of the present application is to provide a hammer toe screw anti-rotation system to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A hammer toe screw anti-rotation system, comprising a nail body, the nail body comprising a nail head and a nail rod that are fixedly connected, the outer peripheral wall of the nail head is provided with two opposite first notches and two opposite second notches; the nail head is provided with a slot that radially penetrates the two first notches, the slot extending from the top of the nail head toward the nail rod; when implanted, the first notch corresponds to the front side of the toe bone, and the second notch corresponds to the side side of the toe bone;

[0010] It also includes a locking screw, the nail head is provided with a hole which radially penetrates the nail head, and the locking screw can be inserted into the hole; the hole passes through two opposite second notches.

[0011] Furthermore, the width of the second notch is smaller than the width of the first notch.

[0012] Furthermore, the slot includes an elongated slot and a circular slot connected to each other, the elongated slot is close to the top of the nail head, and the diameter of the circular slot is greater than the slot width of the elongated slot.

[0013] Furthermore, inverted teeth are respectively provided at the connection between the first notch and the second notch, and the angle between the inverted teeth and the axis of the nail head is 5°-90°.

[0014] Furthermore, the angle between the axis of the nail head and the axis of the nail rod is 0°-30°.

[0015] Furthermore, the nail body is provided with a penetrating guide pin hole along the axial direction, and the guide pin hole is coaxial with the nail rod.

[0016] Furthermore, the angle between the axis of the locking screw and the axis of the nail head is 60°-120°.

[0017] Furthermore, the head of the locking screw is provided with a driving groove.

[0018] The utility model of the anti-rotation system of the hammer toe screw includes a nail body, and the arrangement of two first notches and two second notches at the nail head of the nail body makes the nail head present a four-sided pyramid structure as a whole, which can effectively prevent the rotation of the nail body; the slot is squeezed during implantation to shrink the nail head, making it easier to implant the nail head, and the nail head parts on both sides of the slot are ejected after implantation, and the nail head presses the inner wall of the toe bone, making it difficult to withdraw the nail. It also includes a locking screw, which is inserted into a hole radially penetrating the nail head, which can effectively prevent rotation, promote the fusion of the nail body and the toe bone, and improve stable fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the combination of the nail body and the locking screw in one embodiment of the utility model Figure 1 ;

[0021] Figure 2 This is a structural side view of a nail body in one embodiment of the utility model;

[0022] Figure 3 The main structure of the nail body in one embodiment of the utility model is shown in FIG. Figure 1 ;

[0023] Figure 4This is a top view of the structure of the nail body in one embodiment of the utility model;

[0024] Figure 5 for Figure 4 Cross-sectional view of CC;

[0025] Figure 6 Schematic diagram of the combination of the nail body and the locking screw in one embodiment of the utility model Figure 2 ;

[0026] Figure 7 The main view of the nail body in one embodiment of the utility model Figure 2 ;

[0027] Figure 8 for Figure 7 Cross-sectional view of DD.

[0028] in:

[0029] 1. nail body; 11. nail head; 111. first notch; 112. second notch; 113. hole; 114. inverted teeth; 115. slot; 1151. long slot; 1152. round slot; 12. nail rod; 121. thread; 122. cutting edge; 13. guide pin hole;

[0030] 2. Locking screw; 21. Driving groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1-Figure 8 As shown, the present embodiment provides a hammer toe screw anti-rotation system, which includes a nail body 1 and a locking screw 2. The nail body 1 includes a nail head 11 and a nail rod 12 that are fixedly connected. The outer peripheral wall of the nail head 11 is provided with two opposite first notches 111 and two opposite second notches 112. The nail head 11 is provided with a slot 115 that radially penetrates the two first notches 111, and the slot 115 extends from the top of the nail head 11 toward the nail rod 12. The two first notches 111 and the two second notches 112 are arranged opposite to each other, so that the nail head 11 presents a quadrangular pyramid structure as a whole, which plays an anti-rotation role. At the same time, the tip design at the top of the nail head 11 makes the hammer toe screw easier to implant during surgery. During implantation, the first notch 111 corresponds to the front of the phalanx, and the second notch 112 corresponds to the side of the phalanx. The radially penetrating slots 115 provided on the nail head 11 are squeezed during implantation to shrink the nail head 11, making it easier to implant the nail head 11. After implantation, the nail head 11 parts on both sides of the slots 115 are ejected outward, and the nail head 11 presses the inner wall of the hammer toe, making it difficult for the nail body 1 to be withdrawn after implantation, promoting the fusion of the hammer toe screw 1 and the phalange, and improving the stability of fixation. The nail head 11 is provided with a hole 113 that radially penetrates the nail head 11, and the locking screw 2 can be inserted into the hole 113. After the entire nail body 1 is implanted, the locking screw 2 is driven in to fuse the nail body 1 with the phalange, which can effectively prevent rotation and improve stability.

[0036] In this embodiment, Figure 1 As shown, the hole 113 passes through two opposite second notches 112 , the width of the second notch 112 is smaller than the width of the first notch 111 , and the locking screw 2 passes through the two second notches 112 along the hole 113 and is implanted into the side of the toe bone.

[0037] In this embodiment, the locking screw 2 is installed on the nail head 11, and the slot 115 passes through the two first notches 111. After implantation, the nail heads 11 on both sides separated by the slots 115 press the inner wall of the hammer toe, and the locking screw 2 passes through the two second notches 112. The phalanges connected to the locking screw 2 and the phalanges on which the nail head 11 presses the inner wall of the hammer toe due to the action of the slots 115 are basically consistent, and the anti-rotation effect is better; in addition, during implantation, the first notch 111 corresponds to the front of the phalanges, and the second notch 112 corresponds to the side of the phalanges. The front width of the human phalanges is greater than the side width of the phalanges. The locking screw 2 passes through the second notch 112 and is connected to the phalanges on both sides, that is, the locking screw 2 is arranged along the front of the phalanges, the connection length can be longer, and the connection stability is good.

[0038] In this embodiment, Figure 2 As shown, each second notch 112 is adjacent to the first notch 111, and the width of the second notch 112 is smaller than the width of the first notch 111. Generally, the front width of a human phalange is larger than the side width of the phalange, so the widths of the designed first notch 111 and second notch 112 are different. During implantation, the first notch 111 with a wider width corresponds to the front of the phalange, and the second notch 112 with a narrower width than the first notch 111 corresponds to the side of the phalange.

[0039] In this embodiment, each first notch 111 and second notch 112 is made into a concave structure, which can reduce the contact area between the nail body 1 and the phalange bone and maintain blood flow. At the same time, the concave can form a groove to prevent the nail body 1 from rotating and falling out.

[0040] In this embodiment, Figure 3 As shown, the slot 115 includes an elongated slot 1151 and a circular slot 1152 connected to each other, the elongated slot 1151 is close to the top of the nail head 11, and the diameter of the circular slot 1152 is larger than the slot width of the elongated slot 1151. The elongated slot 1151 is compressed during the implantation process to reduce the diameter of the nail head 11, and the circular slot 1152 is arranged to evenly distribute the pressure at the bottom of the slot 115 when the nail head 11 is implanted and squeezed, making the elongated slot 1151 easier to deform and reset.

[0041] In this embodiment, Figure 5 As shown, the nail head 11 and the nail rod 12 are coaxial. In other embodiments, the nail head 11 and the nail rod 12 may also be non-coaxial, that is, the axis of the nail head 11 intersects the axis of the nail rod 12 to adapt to the structure of human toe bones, such as Figure 7 and Figure 8 The angle between the axis of the nail head 11 and the axis of the nail rod 12 is α, and the range of the angle α is 0°-30°. Generally, human toe bones will bend downward at a certain angle, so the nail head 11 is deflected in the direction toward the two opposite first notches 111.

[0042] In this embodiment, the connection between the first notch 111 and the second notch 112 is provided with a reverse tooth 114, which also has the function of preventing the nail from retreating after implantation. Figure 5 As shown, the included angle between the inverted tooth 114 and the axis of the nail head 11 is β, and the range of the included angle β is 5°-90°.

[0043] In other embodiments, the inverted teeth 114 may be evenly distributed on the two opposite second notches 112, such as Figure 6 shown.

[0044] In this embodiment, the hammer toe screw 1 is provided with a guide pin hole 13 extending therethrough in the axial direction, and the guide pin hole 13 is coaxial with the screw rod 12. Figure 5 and Figure 8 When the nail head 11 is coaxial with the nail rod 12, the guide needle hole 13 is also coaxial with the nail head 11; when the nail head 11 is not coaxial with the nail rod 12, that is, when the axis of the nail head 11 intersects with the axis of the nail rod 12, the guide needle hole 13 is also not coaxial with the nail head 11. The top of the nail head 11 is a quadrangular pyramid structure, and the tip of the quadrangular pyramid structure is provided with a guide needle hole 13 that penetrates the nail rod 12 downward. The cross section of the guide needle hole 13 is circular, and the penetrating guide needle hole 13 structure cooperates with the implantation of the guide needle, with high implantation accuracy, convenient intraoperative positioning, and more conducive to clinical operation.

[0045] In this embodiment, the outer peripheral wall of the nail rod 12 is provided with a thread 121, and the thread 121 can be a deep thread, that is, the thread has a relatively large tooth depth, which can effectively hold the cancellous bone and enhance the thread holding force. The tail end of the nail rod 12 can be provided with a cutting edge 122. In this embodiment, the number of the cutting edges 122 is three, and the three cutting edges 122 are evenly distributed at the tail end of the nail rod 12 at 120°, which can achieve the self-drilling and self-tapping functions, and the three cutting edges 121 can play a positioning role before the nail body 1 is implanted during surgery, making it more convenient for the subsequent hammer toe screw thread 121 to be screwed in. In other embodiments, the number of cutting edges 122 is not specifically limited, and can be 1-5.

[0046] In this embodiment, the locking screw 2 is fully threaded, and the corresponding hole 113 is a threaded hole, and the locking screw 2 is screwed into the threaded hole 113. In other embodiments, the locking screw 2 can be a semi-threaded screw or a smooth rod guide pin, and the corresponding hole 113 can be a semi-threaded screw hole or a smooth hole.

[0047] In this embodiment, Figure 5 As shown, the hole 113 is located below the slot 115, and the two do not intersect. The locking screw 2 is connected to the nail head 11 below the slot 115, and the connection is more firm.

[0048] The included angle between the axis of the locking screw 2 and the axis of the nail head 11 is γ, and the range of the included angle γ is 60°-120° to adapt to different toe bone fracture conditions.

[0049] The head of the locking screw 2 is provided with a driving groove 21, which can be implanted into the bone in cooperation with an instrument.

[0050] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hammer toe screw anti-rotation system, characterized in that: The nail body (1) comprises a nail head (11) and a nail rod (12) which are fixedly connected, the outer peripheral wall of the nail head (11) being provided with two opposite first notches (111) and two opposite second notches (112); the nail head (11) being provided with a slot (115) which radially penetrates the two first notches (111), the slot (115) extending from the top of the nail head (11) towards the nail rod (12); when implanted, the first notches (111) correspond to the front side of the phalange, and the second notches (112) correspond to the side side of the phalange; It also comprises a locking screw (2), the nail head (11) being provided with a hole (113) radially penetrating the nail head (11), and the locking screw (2) can be inserted into the hole (113); the hole (113) passes through the two second notches (112).

2. The hammer toe screw anti-rotation system according to claim 1, characterized in that: The width of the second notch (112) is smaller than the width of the first notch (111).

3. The hammer toe screw anti-rotation system according to claim 1, characterized in that: The slot (115) comprises an elongated slot (1151) and a circular slot (1152) which are connected to each other. The elongated slot (1151) is close to the top of the nail head (11), and the diameter of the circular slot (1152) is greater than the slot width of the elongated slot (1151).

4. The hammer toe screw anti-rotation system according to claim 1, characterized in that: A reverse tooth (114) is respectively provided at the connection between the first notch (111) and the second notch (112), and the angle between the reverse tooth (114) and the axis of the nail head (11) is 5°-90°.

5. The hammer toe screw anti-rotation system according to claim 1, characterized in that: The angle between the axis of the nail head (11) and the axis of the nail rod (12) is 0°-30°.

6. The hammer toe screw anti-rotation system according to claim 1, characterized in that: The nail body (1) is provided with a penetrating needle guide hole (13) along the axial direction, and the needle guide hole (13) is coaxial with the nail rod (12).

7. The hammer toe screw anti-rotation system according to claim 1, characterized in that: The angle between the axis of the locking screw (2) and the axis of the nail head (11) is 60°-120°.

8. The hammer toe screw anti-rotation system according to claim 1, characterized in that: The head of the locking screw (2) is provided with a driving groove (21).

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