Fixing plate capable of being adjusted in sliding mode

Abstract

The utility model relates to the technical field of medical instruments, in particular to a fixing plate capable of being adjusted in a sliding mode, the fixing plate is provided with a strip-shaped hole and a plurality of screw holes, and linear teeth are arranged on the side edge of the strip-shaped hole. According to the scheme, the broken bone is connected through the fixing plate and the screw, the linear teeth are arranged in the fixing plate, the relative movement of the fixing plate is accurately adjusted through the adjustor matched with the linear teeth in a rotating mode, and then the distance between a bone sheet and a fracture surface is accurately adjusted; the crown part of the regulator is supported and limited through the supporting piece, and the fixing plate is prevented from lateral deviation through the supporting piece and the connecting screw, so that the regulation operation is stable and controllable. The scheme is simple in structure, easy to operate and suitable for clinical popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more particularly to a slidably adjustable fixing plate. Background Art

[0002] During fracture reduction surgery, it is often necessary to pull and fix the broken bone fragments in place on the fracture surface. However, the surgery often encounters the following problems. First, the bones or bone fragments on both sides of the fracture surface are often connected by soft tissue, which causes the bone fragments to be pulled away from the fracture surface by the soft tissue, making them difficult to align and fix. Second, the two sides of the fracture surface are covered by a large area of ​​soft tissue, resulting in a small surgical operation area. The operation of pushing the bone fragments to be reduced through the soft tissue from both sides is not stable. Third, the adjustment of the distance between the two sides of the fracture surface is not precise enough. For those with normal bone quality, the bone fragments should be pressed tightly against the fracture surface to help the bone grow and repair faster; for patients with osteoporosis, the pressure between bones should not be too large. If it is too large, it will easily lead to collapse or fracture, which is not conducive to bone repair. Therefore, a certain distance between the two sides of the fracture surface needs to be maintained.

[0003] Existing fracture fixation devices struggle to meet these requirements. Commonly used porous steel plates and screws in this field require manual position adjustment. Patent application number 202122495650.6 provides an orthopedic connecting screw plug that allows for the splicing of multiple steel plates, but does not address the technical issue of precise adjustment.

[0004] Therefore, there is an urgent need to provide a locking system that can accurately adjust the distance between the bone fragments and the fracture surface, thereby adjusting the pressure between the bone fragments and the fracture surface and improving the fracture recovery effect. Utility Model Content

[0005] The present invention aims to overcome at least one of the deficiencies of the above-mentioned prior art and provide a slidably adjustable fixing plate for accurately adjusting the distance between the bone fragment and the fracture surface, thereby adjusting the pressure between the bone fragment and the fracture surface and improving the fracture recovery effect.

[0006] The technical solution adopted by the utility model is to provide a slidably adjustable fixing plate, which is provided with a strip hole and a plurality of screw holes, and the side edges of the strip hole are provided with linear teeth.

[0007] The scenario of the above technical solution is a mating surface, where one end of the fixing plate is fixed to the surface of the base component on one side of the mating surface, and the other end is fixed to the surface of the separating component on the other side of the mating surface. In some embodiments, the mating surface is the fracture surface of a bone fracture, the base component is a normal bone, and the separating component is a bone fragment. The fixing plate is locked to connect the base component and the separating component by multiple screws, providing a stable fixing structure. The linear teeth serve as an adjustment scale, which can accurately adjust the sliding of the fixing plate relative to the base component, and thus accurately adjust the distance between the base component and the separating component.

[0008] Furthermore, the linear teeth are multiple segments, each located on any side of the strip-shaped hole. The linear teeth are not limited to a single side of the strip-shaped hole; instead, each segment of linear teeth is distributed along any side of the strip-shaped hole. The operating surface during fracture surgery is relatively narrow due to being obscured by the skin, so this design facilitates adjustment operations at various angles.

[0009] Furthermore, the length of the strip-shaped hole is 30 to 200 mm, and the width is 3 to 8 mm; the tooth spacing of the linear teeth is 0.2 to 3 mm; and the ratio of the height of the linear teeth to the width of the strip-shaped hole is 1:(2 to 20). Limiting the tooth spacing and limiting the ratio of the linear tooth height to the width of the strip-shaped hole allows for more precise adjustment of the distance between the bone fragment and the fracture surface.

[0010] Furthermore, the slidably adjustable fixing plate also includes an adjuster, a portion of which is accommodated in the strip hole and engages with the linear teeth. The adjuster includes a crown and a handle. The side of the crown is gear-shaped, configured to engage with the linear teeth and mate with the other side of the strip hole. The bottom surface of the crown is provided with a positioning member, which is a protrusion or groove. The diameter of the adjuster crown is 3 to 8 mm, the height is 5 to 15 mm, and the height of the positioning member is 0.5 to 4 mm. The diameter of the adjuster crown should be slightly smaller than the width of the strip hole, but not too small to prevent it from not mate with the other side of the strip hole, further causing the adjuster to slide in a direction perpendicular to the fixing plate, thereby interfering with the adjustment operation. The height of the adjuster crown is limited and the positioning member is provided to ensure that the adjuster crown passes through the strip hole and supports the surface of the base component, preventing the adjuster from idling in the strip hole during rotation and failing to move the fixing plate.

[0011] Furthermore, it also includes a connecting screw, which is used to pass through the strip hole and screw into the base member to enhance the fixing effect and prevent the sliding of the fixing plate from deviating from the preset adjustment direction during the adjustment process.

[0012] Furthermore, to address the problem of loosening of the connection between the connecting screw and the fixing plate, the present invention employs two approaches. In one embodiment of the present invention, the lower bottom surface of the head of the connecting screw serves as a first friction surface, and the diameter of the head is greater than the width of the strip-shaped hole, and the first friction surface covers the linear teeth. In another embodiment, a washer is provided between the head of the connecting screw and the fixing plate, and the lower bottom surface of the washer serves as a second friction surface, and the diameter of the washer is greater than the width of the strip-shaped hole, and the second friction surface covers the linear teeth.

[0013] Furthermore, one end of the strip-shaped hole has more screw holes than the other end, and there are at least two. During adjustment, it is necessary to first drive two or more screws into the end of the strip-shaped hole closest to the separator to secure this end of the fixing plate to the separator. The linear teeth are then used to adjust the distance between the base member and the separator to prevent the fixing plate from sliding out of the preset adjustment direction during adjustment. If only one screw is driven in, the fixing plate can rotate around it, which can easily cause the fixing plate to deviate from the preset adjustment direction during distance adjustment.

[0014] Furthermore, the screw holes include overlapping holes of different sizes, which is beneficial for compatibility with screws of different sizes.

[0015] Furthermore, the slidably adjustable fixing plate further includes a support member comprising a head and a stem. A protrusion or groove is centrally located on the top surface of the support member's head, adapted to engage with a positioning member on the bottom surface of the adjuster crown and support the adjuster crown. Grooves are located around the bottom surface of the support member's head to facilitate screwdriver tightening. The support member's stem is a threaded rod adapted to engage a normal bone surface. In some embodiments of the present invention, the support member is a screw or bolt. When the patient undergoing surgery has normal bone density, their bone density is sufficient to support the adjuster crown, and a positioning pit is simply chiseled below the strip-shaped hole, eliminating the need for the support member. However, when the patient undergoing surgery has osteoporosis, the rotation of the adjuster also exerts pressure on the support member, and the bone surface beneath the support member is susceptible to collapse under pressure. Therefore, providing a support member helps minimize interference from bone surface collapse on precise adjustment. Furthermore, the positioning pit or groove on the support member's head limits lateral displacement of the adjuster, preventing it from spinning idly within the strip-shaped hole during rotation and failing to move the fixing plate.

[0016] Furthermore, the sidewalls of the groove in the support member's head are threaded, and the slidably adjustable fixing plate also includes an additional bolt for threaded connection with the groove in the support member's head and further locking the fixing plate. After precise adjustment, the additional bolt is configured to pass through the strip-shaped hole in the fixing plate and screw into the groove in the support member, thereby locking the fixing plate and further strengthening the fixing effect.

[0017] Furthermore, the thickness of the fixing plate is L1, the height of the support head is w, and the range of the screw length L of the additional bolt is L1-w<L≤20mm. Since the additional bolt passes through the strip hole on the fixing plate and is screwed into the groove of the support, the screw length of the additional bolt needs to be long enough, L>L1-w, but not more than 20mm. Assuming that the length of the support rod is H, when the support is a screw or a countersunk bolt, the end of the screw will not exceed the end of the support rod, L≤L1+Hw; when the support is a through-hole bolt, the end of the screw will pass through the end of the support rod, L>L1+Hw, and the locking effect is better at this time.

[0018] The slidably adjustable fixing plate is used to precisely adjust the distance between the base member on one side of the mating surface and the separation member on the other side of the mating surface along a predetermined adjustment direction. The method of use is as follows:

[0019] S1. Take a straight line in the adjustment direction as the positioning line, and open a positioning pit on the surface of the base member on the positioning line;

[0020] S2. Fix one end of the fixing plate to the surface of the separating member on the other side of the mating surface with screws. Adjust the position of the fixing plate so that the strip holes on the fixing plate are distributed along the positioning line, the fixing plate spans the mating surface, and the positioning pits are located below the strip holes on the fixing plate. At this time, the fixing plate can slide relative to the base member along the adjustment direction.

[0021] S3. Screw the connecting screws into the surface of the base member below the strip hole and on both sides of the positioning pit, so that the bottom surface of the connecting screw head presses against the fixing plate;

[0022] S4. Insert the crown of the adjuster into the strip-shaped hole so that the crown of the adjuster engages with the linear teeth and fits against the side of the strip-shaped hole. The positioning member of the crown of the adjuster presses against the positioning pit. Rotate the adjuster to precisely adjust the movement of the fixing plate relative to the base member, thereby precisely adjusting the movement of the separating member relative to the base member.

[0023] S5. After the adjustment is completed, tighten the connecting screws to fix the fixing plate and the base component relatively, and remove the adjuster.

[0024] When the method is used for osteoporosis patients, step S1 is replaced by taking a straight line in the adjustment direction as the positioning line, and screwing the support member into the surface of the base member on the positioning line; the positioning pits in S2 and S3 are replaced by the support member.

[0025] To further enhance the locking effect, step S6 is added after step S5, wherein the additional bolt is passed through the strip hole on the fixing plate and screwed into the groove on the head of the support member to lock the fixing plate.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] This utility model provides a slidably adjustable fixation plate that connects the fractured bone via screws and is equipped with linear teeth. By rotating an adjuster that engages the linear teeth, the relative movement of the fixation plate, and thus the distance between the bone fragment and the fracture surface, can be precisely adjusted. A support member supports and limits the crown of the adjuster, and the support member and connecting screws prevent lateral deviation of the fixation plate, making the adjustment operation stable and controllable. This solution has a simple structure and is easy to operate. It can accurately adjust the distance between the bone fragment and the fracture surface, thereby adjusting the pressure between the bone fragment and the fracture surface, improving the fracture recovery effect, and is suitable for clinical promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the slidably adjustable fixing plate provided in Example 1.

[0029] Figure 2 This is a schematic diagram of the structure of the regulator provided in Example 1.

[0030] Figure 3 A cross-sectional view of the slidably adjustable fixing plate provided in Example 1 at the connecting screw.

[0031] Figure 4 A cross-sectional view of the slidably adjustable fixing plate provided in Example 2 at the connecting screw.

[0032] Figure 5 This is a schematic structural diagram of the slidably adjustable fixing plate provided in Example 3.

[0033] Figure 6 A cross-sectional view of the slidably adjustable fixing plate provided in Example 3 at the connecting screw and the supporting member, wherein the supporting member is a bolt.

[0034] Figure 7 A schematic structural diagram of the slidably adjustable fixing plate provided in Example 4.

[0035] Figure 8 A cross-sectional view of the slidably adjustable fixing plate at the additional bolt provided in Example 4, Figure 8 aThe support is a countersunk bolt. Figure 8 b The support member is a through-hole bolt.

[0036] Figure 9 Schematic diagram of a strip-shaped hole with multiple straight teeth provided in Example 5.

[0037] Figure 10 The present invention provides fixing plates of different shapes.

[0038] Explanation of the reference numerals: normal bone 100, bone fragment 200, fracture surface 300, fixing plate 400, strip hole 410, linear teeth 420, connecting screw 500, washer 510, first friction surface 520, second friction surface 530, adjuster 600, positioning member 610, positioning pit 700, support member 800, additional bolt 900. DETAILED DESCRIPTION

[0039] The drawings in this utility model are for illustrative purposes only and are not to be construed as limiting the scope of this utility model. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the products. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0040] The scenario of the following embodiment is a fracture reduction surgery, the mating surface is the fracture surface 300 of the fracture, the base component is the normal bone 100, and the separation component is the bone fragment 200.

[0041] Example 1

[0042] like Figures 1 to 3 As shown, this embodiment provides a slidably adjustable fixing plate, comprising:

[0043] The fixing plate 400 is provided with a strip hole 410 and a plurality of screw holes, and the side of the strip hole 410 is provided with a straight tooth 420;

[0044] A connecting screw 500 is used to pass through the strip-shaped hole 410 on the fixing plate 400 and connect the fixing plate 400 and the normal bone 100; and

[0045] The regulator 600 includes a crown and a handle. The side of the crown is gear-shaped, used to cooperate with the linear teeth 420 and fit with the other side of the strip hole 410. The bottom surface of the crown is provided with a positioning piece 610, and the positioning piece 610 is a protrusion.

[0046] The fixing plate 400 is connected to the base member and the separator by multiple screws, providing a stable fixing structure. The linear teeth 420 serve as an adjustment scale to accurately adjust the sliding of the fixing plate 400 relative to the base member, thereby accurately adjusting the distance between the base member and the separator.

[0047] The strip-shaped hole is 30 mm long and 6 mm wide; the linear teeth have a 1 mm pitch; and the ratio of the linear tooth height to the strip-shaped hole width is 1:10. Limiting the tooth pitch and the ratio of the linear tooth height to the strip-shaped hole width allows for more precise adjustment of the distance between the bone fragment and the fracture surface.

[0048] The diameter of the crown of the adjuster 600 is 6.5mm and the height is 10mm. The height of the positioning piece 610 of the adjuster 600 is 2mm. The diameter of the head of the adjuster 600 should be slightly smaller than the width of the strip hole 410, but not too small, so that it cannot fit on the other side of the strip hole 410, further causing the adjuster 600 to slide in a direction perpendicular to the fixing plate 400, thereby interfering with the adjustment operation. The purpose of limiting the height of the crown of the adjuster 600 and providing the positioning piece 610 is to allow the crown of the adjuster 600 to pass through the strip hole 410 and support the surface of the normal bone 100, thereby preventing the adjuster 600 from idling in the strip hole 410 during rotation and failing to drive the fixing plate 400 to move.

[0049] To solve the problem of loose connection between the connecting screw 500 and the fixing plate 400, Figure 3As shown, the lower bottom surface of the head of the connecting screw 500 in this embodiment is a first friction surface 520 , and the diameter of the head is larger than the width of the strip-shaped hole 410 , and the first friction surface 520 covers the linear teeth 420 .

[0050] The above-mentioned slidably adjustable fixing plate is used to precisely adjust the distance between the base member on one side of the mating surface and the separation member on the other side of the mating surface along a preset adjustment direction. The method of use is as follows:

[0051] S1. Take a straight line in the adjustment direction as the positioning line, and open a positioning pit 700 on the surface of the base member on the positioning line;

[0052] S2. Fix one end of the fixing plate 400 to the surface of the separating member on the other side of the mating surface with screws. Adjust the position of the fixing plate 400 so that the strip holes 410 on the fixing plate 400 are distributed along the positioning line, the fixing plate 400 spans the mating surface, and the positioning pits 700 are located below the strip holes 410 on the fixing plate 400. At this time, the fixing plate 400 can slide relative to the base member along the adjustment direction.

[0053] S3. Screw the connecting screws 500 into the surface of the base member below the strip hole 410 and on both sides of the positioning pit 700, so that the bottom surface of the head of the connecting screw 500 presses against the fixing plate 400;

[0054] S4. Insert the crown of the adjuster 600 into the strip-shaped hole 410 so that the crown of the adjuster 600 engages with the linear teeth 420 and fits against the side of the strip-shaped hole 410. The positioning member 610 of the crown of the adjuster 600 presses against the positioning pit 700. Rotate the adjuster 600 to precisely adjust the movement of the fixing plate 400 relative to the base member, thereby precisely adjusting the movement of the separating member relative to the base member.

[0055] S5. After the adjustment is completed, tighten the connecting screws 500 to fix the fixing plate 400 and the base component relative to each other, and remove the adjuster 600.

[0056] The slidably adjustable fixing plate provided in this embodiment is connected to the broken bone via a fixing plate 400 and screws. Linear teeth 420 are provided within the fixing plate 400. By rotating an adjuster 600 that engages with the linear teeth 420, the relative movement of the fixing plate 400 is precisely adjusted, thereby precisely adjusting the distance between the bone fragment 200 and the fracture surface 300. A positioning pit 700 supports and limits the crown of the adjuster, and the positioning pit 700 and connecting screws prevent the fixing plate 400 from lateral deviation, making the adjustment operation stable and controllable. This solution has a simple structure and is easy to operate. It can precisely adjust the distance between the bone fragment 200 and the fracture surface 300, thereby adjusting the pressure between the bone fragment 200 and the fracture surface 300 and improving the fracture recovery effect.

[0057] Example 2

[0058] like Figure 4 As shown, the only difference between this embodiment and embodiment 1 is that a washer 510 is provided between the head of the connecting screw 500 and the fixing plate 400, the lower bottom surface of the washer 510 is a second friction surface, the diameter of the washer 510 is greater than the width of the strip hole 410, and the second friction surface covers the straight teeth 420 to ensure that the second friction surface presses the fixing plate 400.

[0059] Example 3

[0060] like Figure 5 and Figure 6 As shown, the only difference between this embodiment and Example 1 is that the slidably adjustable fixing plate further includes a support member 800, which includes a head and a rod. A groove is provided in the center of the top surface of the support member 800's head, which is configured to mate with the positioning member 610 on the bottom surface of the adjuster 600's crown and support the adjuster 600's crown. Grooves are also provided around the bottom surface of the support member 800's head to facilitate tightening with a screwdriver. The rod of the support member 800 is a threaded rod, configured to be embedded in the surface of the normally positioned bone 100. In some embodiments of the present invention, the support member 800 is a screw or bolt. When the patient undergoing surgery has normal bone density, their bone density is sufficient to support the crown of the adjuster 600. Simply carving a positioning pit 700 below the strip hole 410 is sufficient, eliminating the need for the support member 800. However, when the patient undergoing surgery has osteoporosis, the rotation of the adjuster 600 also exerts a certain amount of pressure on the support member 800, and the bone surface below the support member 800 is prone to collapse under pressure. Therefore, providing the support member 800 helps reduce the interference of bone surface collapse on the precise adjustment operation. Furthermore, the positioning pit 700 or the groove on the head of the support member 800 can limit the lateral displacement of the adjuster 600, preventing the adjuster 600 from idling within the strip hole 410 during rotation and failing to move the fixing plate 400.

[0061] Accordingly, the method of use needs to be modified as follows: the step S1 is replaced by taking a straight line in the adjustment direction as the positioning line, and screwing the support member 800 into the surface of the base member on the positioning line; the positioning pit 700 in S2 and S3 is replaced by the support member 800.

[0062] Example 4

[0063] When the center of the top surface of the head of the support member 800 provided in Example 3 is provided with a groove, in order to further enhance the fixing effect, the slidably adjustable fixing plate further includes an additional bolt 900, such as Figure 7 As shown; the side wall of the head groove of the support member 800 provided in Example 3 is provided with a thread, and the additional bolt 900 is used to form a threaded connection with the head groove of the support member 800 and further lock the fixing plate 400. The use of the additional bolt 900 is not limited to patients with osteoporosis.

[0064] The length of the screw rod of the additional bolt 900 needs to be limited. Figure 8 As shown, assuming that the thickness of the fixing plate 400 is L1, the height of the head of the support member 800 is w, and the length of the rod of the support member 800 is H, the range of the screw length L of the additional bolt 900 is L1-w<L≤20mm. Since the additional bolt 900 passes through the strip hole 410 and is screwed into the groove of the support member 800, the screw length of the additional bolt 900 must be long enough, L>L1-w, but not more than 20mm. When the support member 800 is a screw (not shown in the figure) or a countersunk bolt, as shown in FIG. Figure 8 As shown in a, the end of the screw will not exceed the end of the rod of the support member 800, L<L1+Hw; when the support member 800 is a through-hole bolt, as shown in Figure 8 As shown in b, the end of the screw will pass through the end of the rod of the support member 800, L≥L1+Hw, and the locking effect is better at this time.

[0065] The method for accurately adjusting the distance between bone fracture surfaces provided in this embodiment further requires the following steps:

[0066] S6. Pass the additional bolt 900 through the strip hole 410 on the fixing plate 400 and screw it into the groove of the support member 800 to lock the fixing plate 400.

[0067] Example 5

[0068] like Figure 9 As shown, the only difference between this embodiment and Example 1 is that the linear teeth 420 are multiple segments, each segment being located on any side of the strip-shaped hole 410. The linear teeth 420 are not limited to a single side of the strip-shaped hole 410; instead, each segment of linear teeth 420 is distributed on any side of the strip-shaped hole 410. The operating surface during fracture surgery is relatively narrow due to being obscured by the skin, so this design facilitates adjustment operations at various angles.

[0069] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the claims of the present invention shall be included in the scope of protection of the claims of the present invention. For example, those skilled in the art can select the shape of the fixing plate 400 as needed: Figure 1 and Figure 10 As shown, the shapes include but are not limited to straight line, arc, Y-shape, tree branch, palm shape, and array shape.

Claims

1. A slidably adjustable fixed plate, characterized in that: A strip hole and a plurality of screw holes are provided, and the side of the strip hole is provided with linear teeth; and an adjuster is also included, a part of the adjuster is accommodated in the strip hole and matched with the linear teeth.

2. The slidably adjustable fixing plate according to claim 1, characterized in that: The linear teeth are divided into multiple sections, and each section is arranged on any side of the strip-shaped hole.

3. The slidably adjustable fixing plate according to claim 1, characterized in that: The strip-shaped holes have a length of 30 to 200 mm and a width of 3 to 8 mm.

4. The slidably adjustable fixing plate according to any one of claims 1 to 3, characterized in that: The tooth spacing of the straight teeth is 0.2-3 mm.

5. The slidably adjustable fixing plate according to any one of claims 1 to 3, characterized in that: The ratio of the height of the straight teeth to the width of the strip-shaped holes is 1:(2~20).

6. The slidably adjustable fixing plate according to claim 1, characterized in that: The regulator includes a crown and a handle. The side of the crown is gear-shaped and is used to cooperate with the linear teeth and fit with the other side of the strip hole. The bottom surface of the crown is provided with a positioning piece, which is a protrusion or a groove.

7. The slidably adjustable fixing plate according to any one of claims 1 to 3, characterized in that: Also included are connecting screws, which are used to pass through the strip-shaped holes.

8. The slidably adjustable fixing plate according to any one of claims 1 to 3, characterized in that: The top surface of the slidably adjustable fixing plate is provided with friction surfaces at portions located on both sides of the strip-shaped hole.

9. The slidably adjustable fixing plate according to any one of claims 1 to 3, characterized in that: The number of screw holes at one end of the strip-shaped hole is greater than that at the other end and is at least 2.

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