A tplo animal-specific bone plate

Abstract

The present application belongs to the technical field of medical devices, and particularly relates to a TPLO animal special bone plate, which comprises a handle body extending vertically as a whole for connecting a tibia stem, the top end of the handle body is suspended to form an arm body extending transversely as a whole for connecting a bone cut, the plate body of the handle body and the arm body is respectively provided with a protruding unit, when the protruding unit is positioned against the tibia, the plate body of the handle body and the arm body is arranged in the gap between the tibia. The arm body extending transversely as a whole can reliably support the middle and lower part of the bone cut, while reducing the surface area of the bone plate head covering the bone cut, and can also ensure the effective fixation of the bone plate to the bone cut. The protruding unit arranged on the inner side of the bone plate and the tibia form a point contact, which can ensure the reliable positioning of the bone plate and the tibia, and also keep a gap between the bone plate and the tibia for blood delivery and circulation, which is beneficial to the blood circulation of the bone block covered by the bone plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a TPLO animal special bone plate. BACKGROUND

[0002] Anterior cruciate ligament disease is a common cause of hindlimb lameness in dogs, which is a chronic degenerative process that can lead to knee instability and articular cartilage wear. Tibial plateau leveling osteotomy (TPLO) is an arc-shaped osteotomy performed on the proximal tibia, which changes the tibial plateau angle to offset the negative effects of tibial thrust, making the joint stable without cruciate ligament, and then using a special bone plate and screw for fixation.

[0003] The applicant's prior patent application CN208048833U discloses an animal TPLO bone plate, which is composed of a bone plate handle and a bone plate head. The bone plate head is in the shape of a clover, and three protrusions are arranged on the inner side of the bone plate head. The bone plate head and the bone plate handle are each provided with a 1.3mm small hole, the angle between the bone plate head and the bone plate handle is 158°, the angle between the bone plate head and the horizontal plane is 160°, all the bone plate holes are locking holes with internal threads, and the bone plate hole on the bone plate handle has a slope guide rail, which has the function of pressing the fracture line. The bone plate head of the bone plate is large, which can reliably support and fix the osteotomy for large, medium and similar size animals, and when used for small dogs or young animals, the contact area with the tibia is large, which will frequently stimulate the surrounding soft tissue during animal movement, affecting the recovery of the joint during the operation, and in severe cases, causing damage to the adjacent soft tissue. SUMMARY

[0004] The purpose of the present application is to provide a TPLO animal special bone plate which can reduce the stimulation to soft tissue while ensuring effective support for osteotomy.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a TPLO animal special bone plate, which comprises a handle body extending vertically as a whole for connecting the tibial shaft, a top end of the handle body extends downward to form an arm body extending horizontally as a whole for connecting the osteotomy, a convex extension unit is arranged on the inner side of the plate body of the handle body and the arm body, and when the convex extension unit is positioned against the tibia, the plate body of the handle body and the arm body are arranged in a gap with the tibia.

[0006] Compared with the prior art, the present application has the following technical effects: the arm body extending in the whole transverse direction can reliably support the middle and lower part of the cut bone, reduces the surface area of the cut bone covered by the head of the bone plate, and ensures the effective fixation of the bone plate to the cut bone. The protruding unit arranged on the inner side of the bone plate forms a point contact with the tibia, ensures the reliable positioning of the bone plate and the tibia, and keeps a gap between the bone plate and the tibia for blood delivery and circulation, which is beneficial to the blood circulation of the bone block covered by the bone plate. BRIEF DESCRIPTION OF DRAWINGS

[0007] The content expressed by each drawing of the present specification and the labels in the drawings are briefly described as follows:

[0008] Figure 1 is a front view of the left bone plate in use;

[0009] Figure 2 is a left view of the right bone plate in use;

[0010] Figure 3 , 4 is a perspective view of the left bone plate;

[0011] Figure 5 is a front view of the right bone plate;

[0012] Figure 6 is Figure 5 A-A sectional view in the

[0013] Figure 7 is a side view of the right bone plate arm body in a horizontal placement posture;

[0014] Figure 8 is a c view in Figure 5 ;

[0015] Figure 9 is a rear view of another embodiment of the right bone plate.

[0016] In the drawings: 10. handle body, 11. notch, 12. boss, 20. arm body, 20a. flat plate segment, 20b. bent plate segment, 21. foot, 30. curved plate, 31. offset line, 41. handle body bolt hole, 42. arm body bolt hole, 43. positioning hole. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application are further described in detail below with reference to the drawings.

[0018] A TPLO animal special bone plate, as shown in the accompanying drawings Figure 1 , 5As shown, the bone plate comprises a handle body 10 which is vertically arranged for connecting the tibial shaft A1, and an arm body 20 which is horizontally arranged for connecting the osteotomy A2. As shown in the accompanying drawings, the handle body 10 is vertically arranged for connecting the tibial shaft A1, and the arm body 20 is horizontally arranged for connecting the osteotomy A2. Figure 1 As shown, the arm body 20 extends obliquely upward from the cutting surface of the osteotomy A2 to the middle of the osteotomy bone block and continues to extend horizontally to the osteotomy A2 in the osteotomy direction, so as to effectively position and support the middle and lower bone blocks of the osteotomy A2, while reducing the surface area of the osteotomy A2 covered by the head of the bone plate and ensuring effective fixation of the osteotomy A2. Compared with the prior art, the upper profile of the arm body 20 is a smooth curve as a whole and has a large distance from the top surface of the osteotomy A2, which can significantly reduce the probability of the bone plate contacting and stimulating the soft tissues such as ligaments located above the osteotomy A2. It should be noted that the use state of the bone plate is shown in the accompanying drawings. Figure 1 、 2 As shown, the bone plate comprises a handle body 10 which is vertically arranged for connecting the tibial shaft A1, and an arm body 20 which is horizontally arranged for connecting the osteotomy A2. As shown in the accompanying drawings, the handle body 10 is vertically arranged for connecting the tibial shaft A1, and the arm body 20 is horizontally arranged for connecting the osteotomy A2. Figure 5 As shown, the handle body 10 is a vertically arranged strip-shaped plate, and the arm body 20 is a horizontally arranged strip-shaped plate. In order to ensure reliable fixation of the osteotomy A2, the handle body 10 and the arm body 20 are of an integrated structure, and in order to match the left and right legs of an animal, the bone plate also comprises a left bone plate and a right bone plate which are symmetrically arranged.

[0019] For ease of description, the inner side of the bone plate is defined as the side adjacent to the tibia, and the outer side is defined as the side away from the tibia. The plate body of the handle body 10 and the plate body of the arm body 20 are respectively provided with a protruding unit, and when the protruding unit is positioned in abutment with the tibia A, the plate body of the handle body 10 and the plate body of the arm body 20 are arranged in a spaced manner from the tibia A. As shown in the accompanying drawings, Figure 2 As shown, the bone plate comprises a handle body 10 which is vertically arranged for connecting the tibial shaft A1, and an arm body 20 which is horizontally arranged for connecting the osteotomy A2. As shown in the accompanying drawings, the handle body 10 is vertically arranged for connecting the tibial shaft A1, and the arm body 20 is horizontally arranged for connecting the osteotomy A2.

[0020] The bone plate is fixedly connected to the tibia A by means of bolts, and therefore the handle body 10 and the arm body 20 are respectively provided with bolt holes. The bolt hole provided on the handle body 10 is defined as a handle body bolt hole 41, and the hole core of the handle body bolt hole 41 is perpendicular to the plate body of the handle body 10. The bolt hole provided on the arm body 20 is defined as an arm body bolt hole 42, and the hole core of the arm body bolt hole 42 is a space curve, which avoids the intersection of the bolts in the osteotomy A2 and prevents mutual interference, so as to ensure reliable fixation of the bone plate to the osteotomy A2.

[0021] In the embodiment, two handle body bolt holes 41 are arranged on the handle body 10, two arm body bolt holes 42 are arranged on the arm body 20, and the hole cores of the two handle body bolt holes 41 are parallel. In other embodiments, the hole core of the handle body bolt hole 41 can also be a straight line in a different plane, and the number of the handle body bolt hole 41 and the arm body bolt hole 42 can be increased according to requirements. In order to facilitate surgical operation, a positioning hole 43 is arranged between the two handle body bolt holes 41, and a positioning hole 43 is arranged on the lower side of the gap between the two arm body bolt holes 42, which is used for the operation of the Kirschner wire to achieve the preliminary positioning of the bone plate. Further, in the embodiment, the lower end of the handle body 10 is provided with a notch 11, and in order to facilitate the processing of the notch 11, the bottom end face of the handle body 10 constituting the outline of the notch 11 is a partial cylindrical surface, and the cylinder core thereof is coplanar with the hole core of the handle body bolt hole 41.

[0022] In the embodiment, the protruding unit arranged on the handle body 10 is a boss 12 protruding to the side where the tibia A is located from the plate-shaped body of the handle body 10. As shown in the embodiment of Figure 9 , the table surface of the boss 12 is annular and constitutes the inner end hole of the handle body bolt hole 41, the table surface of the boss 12 is perpendicular to the hole core of the handle body bolt hole 41, and the protruding height of the boss 12 is greater than 2 mm. As shown in the embodiment of Figure 4 、 6 , 7, the handle body 10 extends vertically as a whole, so the table surface of the boss 12 is a strip-shaped surface extending horizontally as a whole, the boss 12 is arranged in one-to-one correspondence with the handle body bolt hole 41, the handle body bolt hole 41 is located in the middle of the boss 12, the table surface of the boss 12 is perpendicular to the hole core of the handle body bolt hole 41, and the protruding height of the boss 12 is greater than 2.5 mm. The protruding height of the boss 12 refers to the distance between the table surface of the boss 12 and the lowest plate surface on the inner side of the plate-shaped body of the handle body 10. In the embodiment, the plate surface on the inner side of the plate-shaped body of the handle body 10 is a plane, and the table surface of the boss 12 is also a plane, as shown in Figure 6 、 8 , h1 is the protruding height of the boss 12. In a preferred scheme, the table surface of the boss 12 is connected to the plate surface on the inner side of the plate-shaped body of the handle body 10 through a gentle curved surface, and the protruding height of the boss 12 can also be defined as the distance between the top surface and the bottom surface of the gentle curved surface.

[0023] The protruding unit arranged on the arm body 20 is a foot 21, as shown in Figure 4 、 7 , 8, 9, the plate-shaped body of the arm body 20 is provided with a foot 21 protruding to the side where the tibia A is located at the outer edge of the plate-shaped body. The protruding height of the foot 21 is greater than 3 mm. The connecting surface of the foot 21 and the arm body 20 is defined as the bottom surface, and the connecting surface abutting against the tibia A is defined as the top surface, and the protruding height of the foot 21 refers to the maximum distance between the bottom surface and the top surface of the foot 21, that is, Figure 7 、 8 , h2≥3 mm.

[0024] The upper bone block of the cut bone A is cut to obtain a cut bone A2. In order to ensure the establishment of the microcirculation system of the cut bone A2 after the operation, the protruding height of the leg 21 should be large so that the soft tissues such as blood vessels grow into and adhere to the surface of the cut bone A2. That is, in the preferred embodiment, the protruding height of the protruding unit of the arm 20 is greater than the protruding height of the protruding unit of the handle 10. The greater the protruding height, the greater the gap between the bone plate 10 and the tibia A.

[0025] In order to ensure the fit of the bone plate and the tibia A and make the bone plate more consistent with the physiological structure of the tibia A, the arm 20 is outwardly deflected relative to the handle 10, and the deflection line 31 is an inclined line or an arc line with the upper part away from the overhanging end of the arm 20 and the lower part adjacent to the overhanging end of the arm 20. As shown in the embodiment Figure 5 , point a is the upper end point of the deflection line 31, and point b is the lower end point of the deflection line 31. Obviously, the upper end point of the deflection line 31 is away from the overhanging end of the arm 20, and the lower end point is adjacent to the overhanging end of the arm 20. In the embodiment, the hole cores of the handle bolt holes 41 on the handle 10 are arranged in parallel, the deflection line 31 is an inclined line, and the included angle between the deflection line 31 and the hole cores of the handle bolt holes 41 is 40°-60°. Further, in the embodiment, the handle 10 and the arm 20 are connected by the curved surface plate 30, and the deflection line 31 is the generatrix of the curved surface plate 30. The arm 20 includes a flat plate segment 20a connected to the curved surface plate 30, as shown in the embodiment Figure 8 , the included angle α between the flat plate segment 20a and the handle 10 is 155°-165°. The other end of the flat plate segment 20a is connected to a bent plate segment 20b which is bent inwardly, and the upper plate edge and the lower plate edge of the flat plate segment 20a are respectively provided with the leg 21, and the protruding height of the inner surface of the bent plate segment 20b is greater than that of the leg 21. As shown in the embodiment Figure 7 , the right bone plate flat plate segment 20a is horizontally placed and the inner surface of the bone plate is in a downward posture, and it can be clearly seen that the handle 10 is upwardly tilted relative to the flat plate segment 20a, the right side plate body of the flat plate segment 20a is downwardly bent to form the bent plate segment 20b, and the distance between the end of the bent plate segment 20b and the inner side of the flat plate segment is h3, h3>h2. The provision of the bent plate segment 20b can improve the matching degree of the inner surface contour of the arm 20 and the contour of the cut bone A2, and also make the support and support of the bone plate to the cut bone A2 more reliable. In use Figure 1 , the curved surface plate 30 is located at the fitting surface of the cut bone A2 and the tibial shaft A1, and the deflection line 31 is consistent with the direction of the fitting surface, thereby effectively improving the matching degree of the bone plate and the tibia A.

[0026] In a more preferred embodiment, the deflection line 31 can also be an arc line with the middle part recessed to the side where the handle 10 is located, that is, the deflection line 31 is consistent with the cut circular arc surface of the cut bone A2, so as to further ensure the fit degree of the bone plate.

Claims

1. A TPLO animal-specific bone plate, characterized in that: The application relates to a tibial bone connecting device, which comprises a shank body (10) integrally extending vertically for connecting a tibial shaft (A1), an arm body (20) integrally extending transversely for connecting an osteotomy (A2) and formed by suspending the top end of the shank body (10) in a direction of osteotomy (A2) transposition, and a convex unit arranged on the inner side of the plate body of the shank body (10) and the arm body (20) respectively. The shank body (10) and the arm body (20) are connected through a curved plate (30), the arm body (20) comprises a flat plate segment (20a) connected with the curved plate (30), one end of the flat plate segment (20a) is connected with the curved plate (30), the other end of the flat plate segment (20a) is connected with a bent plate segment (20b) bent inward, and two arm body bolt holes (42) are arranged on the arm body (20). The upper plate edge and the lower plate edge of the flat plate segment (20a) are respectively provided with the convex unit of a supporting leg (21), the connecting surface of the supporting leg (21) and the arm body (20) is defined as a bottom surface, the connecting surface abutting against the tibial bone (A) is defined as a top surface, the convex height h2 of the supporting leg (21) refers to the maximum distance between the bottom surface and the top surface of the supporting leg (21), the distance between the end of the bent plate segment (20b) and the inner side of the flat plate segment is h3, and h3>h2. The arm body (20) is outwardly deflected relative to the shank body (10), and the deflection line (31) is an arc line with the upper part away from the suspended end of the arm body (20) and the lower part adjacent to the suspended end of the arm body (20), and the deflection line (31) is an arc line with the middle part recessed to the side where the shank body (10) is located. The shank body (10) is provided with two shank body bolt holes (41) with parallel hole cores, and a positioning hole (43) is arranged between the two shank body bolt holes (41).

2. A TPLO animal specific bone plate according to claim 1, characterized in that: The convex height of the convex unit on the arm body (20) is greater than or equal to the convex height of the convex unit on the shank body (10).

3. A TPLO-specific bone plate for animals as claimed in claim 1, wherein: The hole core of the shank body bolt hole (41) is perpendicular to the plate body of the shank body (10), and the hole core of the arm body bolt hole (42) is a non-planar straight line.

4. A TPLO-specific bone plate for animals as claimed in claim 3, wherein: The plate body of the shank body (10) is provided with the convex unit of a convex platform (12) extending to the side where the tibial bone (A) is located, and the platform surface of the convex platform (12) is perpendicular to the hole core of the shank body bolt hole (41); The platform surface of the convex platform (12) is annular and forms an inner end hole of the shank body bolt hole (41), and the convex height of the convex platform (12) is greater than 2 mm; Or the platform surface of the convex platform (12) is a strip-shaped horizontal extension, the convex platform (12) is arranged in one-to-one correspondence with the shank body bolt hole (41), and the shank body bolt hole (41) is located in the middle of the convex platform (12), and the convex height of the convex platform (12) is greater than 2.5 mm.

5. A TPLO-specific bone plate for animals according to any one of claims 1-4, characterized in that: The convex height of the supporting leg (21) is greater than 3 mm.

6. A TPLO-specific bone plate for animals as claimed in claim 1, wherein: The included angle between the flat plate segment (20a) and the shank body (10) is 155-165 degrees.

7. A TPLO-specific bone plate for animals as claimed in claim 1, wherein: The hole cores of the shank body bolt holes (41) on the shank body (10) are arranged in parallel.

8. A TPLO-specific bone plate for animals as claimed in claim 2, wherein: The lower side of the gap between the two arm body bolt holes (42) is provided with a positioning hole (43); The lower end of the shank body (10) is provided with a notch (11), the bottom end surface of the shank body (10) forming the outline of the notch (11) is a partial cylindrical surface, and the cylinder core thereof is coplanar with the hole core of the shank body bolt hole (41).

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