TPLO bone plates for animals

Abstract

This invention belongs to the field of medical device technology, and specifically relates to a TPLO bone plate for animals. It includes a stem for connecting the tibial shaft and a head for connecting the osteotomy. The head has a positioning hole in its center, and at least two locking holes are spaced circumferentially around the positioning hole. A ligament insertion hole is provided between adjacent locking holes, and the ligament insertion hole is located near the edge of the head. This invention ensures a stable and reliable connection between the bone plate and the osteotomy while allowing artificial ligaments to pass through, thus meeting the surgical requirements of artificial ligament fixation.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and specifically relates to a TPLO bone plate for animals. Background Technology

[0002] Anterior cruciate ligament (ACL) disease is a common cause of lameness in dogs' hind limbs, a chronic degenerative process that can lead to knee instability and cartilage wear. Tibial plateau leveling osteotomy (TPLO) is a treatment that involves an arc-shaped osteotomy of the proximal tibia followed by rotation to alter the tibial plateau angle, achieving joint stability without the cruciate ligament. The osteotomy is then fixed using specialized bone plates and screws. In the prior art, the head of the TPLO bone plate for animals is typically clover-shaped, as seen in the applicant's earlier patent application CN208048833U, and Chinese patents CN218652118U and CN309066174S.

[0003] After degeneration of the knee joint in dogs, torsion of the femur and tibia is also common. Currently, artificial ligament fixation is usually performed to stabilize the joint. Artificial ligament fixation requires drilling a hole in the proximal tibia to allow the artificial ligament to pass through. In cases where tibial plateau osteotomy has been performed, the head of the TPLO plate obscures most of the proximal lateral tibial bone surface, resulting in insufficient exposed bone surface for drilling. This makes it difficult to perform artificial ligament fixation in the proximal tibia and thus fails to relieve the dog's pain. Utility Model Content

[0004] The purpose of this invention is to provide a TPLO bone plate for animals that can be used for artificial ligament fixation surgery.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a TPLO bone plate for animals, comprising a handle for connecting the tibial shaft and a handle head for connecting osteotomy, wherein the handle head is provided with a handle head positioning hole in the middle, and at least two handle head locking holes are provided circumferentially around the handle head positioning hole, and a cable-passing hole is provided between two adjacent handle head locking holes, and the cable-passing hole is arranged near the edge of the handle head.

[0006] Compared with the prior art, the present invention has the following technical effects: it can ensure a stable and reliable connection between the bone plate and the osteotomy, while allowing artificial ligaments to pass through, thus meeting the surgical requirements of artificial ligament fixation. Attached Figure Description

[0007] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings within them:

[0008] Figure 1 This is a front view of the utility model in use;

[0009] Figure 2 This is a right view of the utility model in use;

[0010] Figure 3 This is a rear view of the present invention;

[0011] Figure 4 yes Figure 3 AA section view in the middle;

[0012] Figure 5 , 6 This is a three-dimensional schematic diagram of the present invention. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0014] A type of TPLO bone plate for animals, as shown in the attached image. Figure 1 , 2 As shown, it includes a handle 10 for connecting the tibial shaft 1 and a handle head 20 for connecting the osteotomy 2. The handle head 20 has a handle head positioning hole 21 in the middle, and at least two handle head locking holes 22 are provided circumferentially around the handle head positioning hole 21. A cable-passing hole 23 is provided between two adjacent handle head locking holes 22, and the cable-passing hole 23 is arranged near the edge of the handle head 20.

[0015] The handle head positioning hole 21, handle head locking hole 22, and cable insertion hole 23 are all through holes. The handle head positioning hole 21 is for inserting Kirschner wires to initially position the bone plate; the handle head locking hole 22 is for inserting screws and fixing them to the osteotomy 2; and the cable insertion hole 23 is for the passage of artificial ligaments. Figure 1 , 2 In the illustrated embodiment, three handle locking holes 22 are provided. In other embodiments, the number of handle locking holes 22 can be increased or decreased according to the shape and size of the osteotomy to be connected. In a preferred embodiment, the handle positioning hole 21 should be located between each handle locking hole 22, so that each handle locking hole 22 is arranged around the outer periphery of the handle positioning hole 21. This minimizes the distance between each handle locking hole 22 and the handle positioning hole 21, reducing the deviation of the locking screw in locking the handle 20 and the osteotomy 2, thereby ensuring the positioning and installation effect of the bone plate.

[0016] To facilitate the insertion of the artificial ligament, the insertion hole 23 is located near the anterior edge of the handle head 20. Here, the side where the animal's head is located is defined as the anterior, and the side where the animal's tail is located is defined as the posterior. The anterior edge of the handle head 20 is the edge of the bone plate handle head 20 adjacent to the side where the animal's head is located, i.e., the attachment... Figure 1On the right side of the head 20. The placement of the ligament hole 23 away from the center of the head 20 effectively avoids interference between the newly drilled hole and the locking screw used to lock the head 20 when it is necessary to drill a hole in the osteotomy 2 for the artificial ligament to pass through, thus ensuring the smooth implementation of the surgery.

[0017] This implementation example is attached. Figure 1 , 3 As shown in Figure 4, two adjacent insertion holes 23 form an insertion hole group 23a. In use, the two ends of the rope-like artificial ligament are inserted from the outside to the inside through the cavities of the two insertion holes 23 in the same insertion hole group 23a. Then, the artificial ligament penetrates the bone body or wraps around the bone body, and the two ends of the artificial ligament are anchored to the other side of the bone body, thus achieving reliable fixation of the artificial ligament.

[0018] In the installation state, as shown in the attached document Figure 1 As shown, the handle 10 is arranged vertically as a whole, and the horizontal direction is roughly perpendicular to the length direction of the handle 10. In the same group of cable holes 23a, the two cable holes 23a are arranged horizontally as a whole, that is, one cable hole 23 is close to the front side and the other is close to the rear side. It can also be said that the two cable holes 23 are arranged adjacent to each other in the front and rear direction of the handle head 20, thus forming a group of cable holes 23a.

[0019] Furthermore, in this embodiment, the cores of the two ligament holes 23 in the same ligament hole group 23a are parallel. When it is necessary to drill a hole in the osteotomy 2 for the artificial ligament to pass through, the core of the hole drilled in the osteotomy 2 should roughly coincide with the ligament hole 23. If the cores of the two ligament holes 23 are parallel, the drilling angle is consistent, which makes the drilling operation easier.

[0020] Preferred solutions are as per the instruction manual. Figure 4 As shown, in the same group of ligament holes 23a, the hole wall between the two ligament holes 23 is recessed inward from the outer plate surface of the stem head 20 to form a channel 24. The channel 24 communicates with the two ligament holes 23 to form a "U"-shaped cavity. Here, the side of the bone plate adjacent to the tibial shaft 1 and osteotomy 2 is defined as the inner side, and the side away from the tibial shaft 1 and osteotomy 2 is defined as the outer side. Therefore, the outer plate surface of the stem head 20 is the plate surface of the stem head 20 away from the osteotomy 2. In this way, the U-shaped bend of the artificial ligament fixed to the bone plate can be accommodated within the channel 24, preventing the artificial ligament from protruding from the outer surface of the bone plate and causing irritation to adjacent soft tissues.

[0021] As attached Figure 1 , 2 As shown, the upper end of the handle 10 extends obliquely backward and bends outward and posterolaterally to form the handle head 20. The plate of the handle head 20 conforms to the adjacent bone surface of the osteotomy 2. The core of the ligament hole 23 is perpendicular to the plate segment in which it is located, which facilitates the processing of the ligament hole 23 and the placement of the artificial ligament during the operation.

[0022] This implementation example is attached. Figure 1 , 3 As shown, the handle head 20 is provided with three handle head locking holes 22 circumferentially spaced around the handle head positioning hole 21. The handle head locking hole 22 includes a first locking hole 22a protruding from the upper end of the handle head 20, a second locking hole 22b arranged near the animal's head and a third locking hole 22c arranged near the animal's tail below the first locking hole 22a.

[0023] The plate between the first locking hole 22a and the second locking hole 22b protrudes forward from the bone plate, making the front edge of the lock head 20 a smooth, outwardly convex curve. The cable hole 23 is located at the protruding part of the front plate of the bone plate. The plate between the first locking hole 22a and the third locking hole 22c is recessed forward from the bone plate, making the rear surface of the lock head 20 a smooth, inwardly concave curve.

[0024] As attached Figure 1 , 6 As shown, a reduction hole 24 is provided on the side wall of the concave plate edge on the posterior side of the bone plate. The reduction hole 24 is for the free end of the reduction forceps to be inserted. After the handle 20 is fixedly connected to the osteotomy 20, one end of the reduction forceps is placed into the reduction hole 24 of the handle 20, and the other end supports the anterior bone surface of the tibial shaft 1, so that the two free ends of the reduction forceps are attached as shown. Figure 1 As shown by the clamping force F, clamping the tibial shaft 1 and osteotomy 2 can initially fix osteotomy 2 and tibial shaft 1 in order to carry out subsequent surgical operations.

[0025] The reduction hole 24 is a blind hole with its opening pointing towards the animal's tail. The reduction hole 25 is also a blind hole, which ensures the strength of the handle 20 plate while facilitating the insertion and application of force by the reduction forceps. The opening of the reduction hole 25 points in the opposite direction to the clamping force of the reduction forceps, and the reduction hole 25 is located on the side wall of the concave edge of the posterior side of the bone plate. This allows the surgeon to operate without visual inspection, simply by placing the jaws of the reduction forceps at the posterior concave edge 20c and making minor adjustments. When applying force, the free end of the jaws of the reduction forceps will automatically sink into the reduction hole 25, greatly improving the convenience of the surgical procedure.

[0026] In this embodiment, the shank locking hole 22 is an internally threaded hole, and the cavity of the shank locking hole 22 is tapered, with the inner part being smaller and the outer part being larger. The shank locking hole 22 and the head of the locking screw housed in its cavity form a threaded engagement, which can ensure reliable fixation of the bone plate and the osteotomy 2.

[0027] To achieve a reliable connection between the stem 10 and the tibial shaft 1, as shown in the attached... Figure 1 As shown, the handle 10 has a handle positioning hole 11, and handle locking holes 12 are respectively provided above and below the handle positioning hole 11. The handle positioning hole 11 allows for the insertion of a Kirschner wire for initial positioning of the handle 10 and the tibial shaft 1, and the handle locking hole 12 allows for the insertion of a locking screw to achieve a fixed connection between the handle 10 and the tibial shaft 1. (See attached image) Figure 1In the illustrated embodiment, three handle locking holes 12 are provided. In other embodiments, the number of handle locking holes 12 should be increased or decreased according to the length and size of the tibia shaft 1 to be connected. The handle positioning hole 11 is located in the middle section of the handle 10, so that the distance between each handle locking hole 12 and the handle positioning hole 10 is shorter, which can reduce the deviation of the locking screw in locking the handle 10 and the tibia shaft 1, and ensure the positioning and installation effect of the handle 10.

[0028] The handle positioning holes 11 and handle locking holes 12 are arranged at intervals along the length of the handle 10. To facilitate production and surgery and reduce postoperative complications, the cores of the handle positioning holes 11 and handle locking holes 12 are parallel. This ensures that the drilling angle is consistent when drilling the tibial shaft 1, the locking screws are also roughly parallel, and the force borne by the tibial shaft 1 by the locking screws is also roughly parallel. This can effectively avoid damage caused by uneven external force transmitted from the bone plate 10 to the tibial shaft 1 after surgery.

[0029] To facilitate fine-tuning of the mounting position of the handle 10 and the tibial shaft 1 during surgery, the handle positioning hole 11 is a waist-shaped hole. The length direction of the handle positioning hole 11 is consistent with the length direction of the handle 10, and the core of the handle positioning hole 11 is perpendicular to the plate segment in which it is located.

[0030] In this embodiment, the handle locking hole 12 includes a figure-eight engagement hole 12a and a circular locking hole 12b. At least two figure-eight engagement holes 12a should be provided, with the figure-eight engagement holes positioned on both sides of the handle positioning hole 11. That is, when figure-eight engagement holes are provided, figure-eight engagement holes are provided above and below the handle positioning hole 11. The circular locking hole 12b has an internal thread on its wall that mates with the head of the locking screw. In other embodiments, the handle 10 may also be provided with only either a figure-eight engagement hole 12a or a circular locking hole 12b, depending on requirements.

[0031] As attached Figure 3 As shown, a shallow groove 13 is provided between two adjacent locking holes 12 on the handle body. The groove cavity of the shallow groove 13 extends from both sides of the handle body 10 towards the middle of the handle body, and its depth and width gradually decrease. This can prevent the edge of the inner surface of the handle body 10 from hitting or even pressing against the tibia shaft 1, causing tibia damage. In this embodiment, the groove cavity of the shallow groove 13 is V-shaped. Two shallow grooves 13 are symmetrically arranged on the front and rear sides at the same position in the length direction of the handle body 10, so that the V-shaped openings of the two corresponding shallow grooves 13 are arranged opposite to each other, and their V-shaped bottoms are not connected.

[0032] The handle positioning hole 11 and the handle locking hole 12 are located in the middle of the handle 10 in the front-back direction. The shallow groove 13 arranged in the same position avoids the handle positioning hole 11 and the handle locking hole 12, and its groove cavity does not penetrate the front-back direction of the handle 10. This can ensure the stable and reliable connection between the locking screw at the handle locking hole 12 and the tibial shaft 1, while reducing the force of the inner surface of the handle 10 on the bone surface of the tibial shaft 1, thereby accelerating the postoperative healing effect of the patient.

[0033] Similarly, to reduce the stimulation and damage of the bone plate to soft tissues, as shown in the appendix Figure 2 , 3 As shown, the plate at the lower end of the handle 10 gradually thins from top to bottom to form a wedge-shaped tail plate 10b. The inner surface of the wedge-shaped tail plate 10b is an inclined surface moving away from the tibial shaft 1 from top to bottom, while the outer surface of the wedge-shaped tail plate 10b is an inclined surface moving towards the tibial shaft 1 from top to bottom. The two sides of the wedge-shaped tail plate 10b gradually approach each other from top to bottom and are connected by a rounded transition. This facilitates the insertion of the handle 10 during surgery and reduces damage to soft tissues at the bottom of the handle 10.

[0034] In this embodiment, as shown in the appendix Figure 1 , 3 As shown in Figures 5 and 6, the handle body 10 includes a handle body base plate 10a, the lower end of the handle body base plate 10a is connected to a wedge-shaped tail plate 10b, and the upper end of the handle body base plate 10a is connected to the handle head base plate 20a through a curved connecting plate 10c.

[0035] The handle head substrate 20a is obliquely bent outward and rearward relative to the handle body substrate 10a, and the angle between the surfaces of the handle head substrate 20a and the handle body substrate 10a is an obtuse angle. (See attached...) Figure 3 As shown, the intersection line l between the handle head substrate 20a and the handle body substrate 10a is an oblique line with the front side higher and the rear side lower.

[0036] The rear plate of the handle base plate 20a is bent inward to form a support plate 20b. The angle between the support plate 20b and the surface of the handle base plate 20a is an obtuse angle. The intersection line of the surfaces of the handle base plate 20a and the support plate 20b is arranged vertically as shown in the attached figure. Figure 1 As shown, the transition curved edge between the handle base plate 20a and the support plate 20b is inclined with the rear side higher and the front side lower. The plate body at the upper end of the handle base plate 20a is bent inward and downward to form a curved relief plate 20c. The relief plate 20c can not only avoid the bone tissue above the osteotomy 2, but also thicken the bone plate body at this location, thereby thickening the hole wall of the handle locking hole 22 located at the relief plate 20c, improving the reliability of the handle locking hole 22 where the core is inclined downward, and thus ensuring the reliability of the connection between the locking screw and the hole.

[0037] As attached Figure 1As shown, the handle base plate 20a bulges rearward to form a support plate 20b, and the handle base plate 20a bulges upward to form a curved clearance plate 20c. The cavity of the first locking hole 22a is located at the joint between the clearance plate 20c and the handle base plate 20a, the cavity of the third locking hole 22c is located at the joint between the support plate 20b and the handle base plate 20a, and the second locking hole 22b and the handle positioning hole 21 are located at the handle base plate 20a.

Claims

1. A TPLO bone plate for animals, comprising a shank (10) for connecting a tibial shaft (1) and a shank head (20) for connecting an osteotomy (2), characterized in that: The handle (20) has a handle positioning hole (21) in the middle, and at least two handle locking holes (22) are provided circumferentially around the handle positioning hole (21). A cable hole (23) is provided between two adjacent handle locking holes (22), and the cable hole (23) is arranged near the edge of the handle (20).

2. The TPLO bone plate for animals according to claim 1, characterized in that: The cable hole (23) is located near the front side plate edge of the handle head (20).

3. The TPLO bone plate for animals according to claim 1, characterized in that: Two cable-passing holes (23) are arranged adjacently to form a cable-passing hole group (23a); The two cable-passing holes (23) in the same cable-passing hole group (23a) are arranged horizontally as a whole; The cores of the two piercing holes (23) in the same piercing hole group (23a) are parallel.

4. The TPLO bone plate for animals according to claim 3, characterized in that: In the same group of cable holes (23a), the hole wall between the two cable holes (23) is recessed inward from the outer plate of the shank (20) to form a channel (24), and the channel (24) is connected to the two cable holes (23) to form a "U" shaped cavity.

5. The TPLO bone plate for animals according to claim 1, characterized in that: The upper end of the handle (10) extends obliquely backward and bends outward to form the handle head (20), and the core of the cable hole (23) is perpendicular to the plate segment in which it is located.

6. The TPLO bone plate for animals according to claim 1, characterized in that: The handle (20) is provided with three handle locking holes (22) circumferentially spaced around the handle positioning hole (21). The handle locking holes (22) include a first locking hole (22a) protruding from the upper end of the handle (20), and a second locking hole (22b) arranged near the animal's head and a third locking hole (22c) arranged near the animal's tail below the first locking hole (22a). The plate between the first locking hole (22a) and the second locking hole (22b) protrudes forward toward the bone plate, and the cable hole (23) is provided at the protruding plate. The plate between the first locking hole (22a) and the third locking hole (22c) is recessed towards the front of the bone plate. A reset hole (25) is provided on the side wall of the recessed plate. The reset hole (25) is a blind hole, and the opening of the reset hole (25) points towards the animal's tail. The shank locking hole (22) is an internally threaded hole and its cavity is tapered with a smaller inner diameter and a larger outer diameter.

7. The TPLO bone plate for animals according to claim 1, characterized in that: The handle (10) is provided with a handle positioning hole (11), and a handle locking hole (12) is provided above and below the handle positioning hole (11); the cores of the handle positioning hole (11) and the handle locking hole (12) are parallel; the handle positioning hole (11) and the handle locking hole (12) are located in the middle of the handle in the front-back direction.

8. The TPLO bone plate for animals according to claim 7, characterized in that: A shallow groove (13) is provided between two adjacent locking holes (12) of the handle body. The groove cavity of the shallow groove (13) extends from both sides of the handle body (10) toward the middle of the handle body and its groove depth and groove width gradually decrease. Two shallow grooves (13) are symmetrically located on the front and rear sides of the handle (10) along the same length direction; the groove cavity of the shallow groove (13) is V-shaped.

9. The TPLO bone plate for animals according to claim 7, characterized in that: The handle positioning hole (11) is a waist-shaped hole. The length direction of the handle positioning hole (11) is consistent with the length direction of the handle (10). The core of the handle positioning hole (11) is perpendicular to the plate segment in which it is located.

10. The TPLO bone plate for animals according to claim 7, characterized in that: The handle locking hole (12) includes an 8-shaped connecting hole (12a), and there are at least two 8-shaped connecting holes (12a) which are respectively located on both sides of the handle positioning hole (11); The handle locking hole (12) includes a circular locking hole (12b), the wall of which is provided with an internal thread that matches the head of the locking screw.

11. The TPLO bone plate for animals according to claim 1, characterized in that: The plate at the lower end of the handle (10) gradually thins from top to bottom to form a wedge-shaped tail plate (10b). The inner surface of the wedge-shaped tail plate (10b) is a slope that moves away from the tibial shaft (1) from top to bottom, and the outer surface of the wedge-shaped tail plate (10b) is a slope that moves closer to the tibial shaft (1) from top to bottom. The two sides of the wedge-shaped tail plate (10b) gradually approach each other from top to bottom and are connected by a rounded transition.

12. The TPLO bone plate for animals according to claim 1, characterized in that: The handle (10) includes a handle base plate (10a), the lower end of the handle base plate (10a) is connected to a wedge-shaped tail plate (10b), and the upper end of the handle base plate (10a) is connected to the handle head base plate (20a) through a curved connecting plate (10c). The handle base plate (20a) is obliquely bent outward and rearward relative to the handle body base plate (10a). The angle between the plate surfaces of the handle base plate (20a) and the handle body base plate (10a) is an obtuse angle. The intersection line between the plate surfaces of the handle base plate (20a) and the handle body base plate (10a) is an oblique line with the front side higher and the rear side lower. The rear plate of the handle base plate (20a) is bent inward to form a support plate (20b). The angle between the support plate (20b) and the plate surface of the handle base plate (20a) is an obtuse angle. The intersection line of the plate surfaces of the handle base plate (20a) and the support plate (20b) is arranged vertically as a whole, with the rear side higher and the front side lower. The plate at the upper end of the handle base plate (20a) is bent inward and downward to form a curved surface clearance plate (20c).

13. The TPLO bone plate for animals according to claim 12, characterized in that: The handle base plate (20a) bulges backward to form a support plate (20b), and the handle base plate (20a) bulges upward to form a curved clearance plate (20c). The cavity of the first locking hole (22a) is located at the joint between the clearance plate (20c) and the handle base plate (20a), the cavity of the third locking hole (22c) is located at the joint between the support plate (20b) and the handle base plate (20a), and the second locking hole (22b) and the handle positioning hole (21) are located at the handle base plate (20a).

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