KR20250068269A - Fixture for High Tibial Osteotomy - Google Patents

Abstract

The present invention provides a fixation device for open proximal tibial osteotomy, which allows the joint positions of blocks and plates to be adjusted as needed.
Accordingly, the present invention discloses a fixing device for proximal tibial osteotomy, including a block inserted between osteotomy surfaces of the tibia and having a longitudinal screw hole in the left-right direction in the central portion, a plate that is in close contact with the outer surface of the tibia and has a longitudinal bolt hole in the upper-lower direction in the central portion and a plurality of clearance holes in the inner portion at regular intervals, a fixing screw that penetrates the bolt hole and is fastened to the screw hole of the block to connect the block to the plate, and a plurality of fixing screws that are fastened to the tibia through the clearance hole to fix the plate to the tibia, wherein the plate is formed as a curved surface in the shape of a cross section that is curved in an arc so as to be in close contact with the outer surface of the tibia, and a surface where the plate and the block come into contact with each other is formed as a smooth surface.

Description

Fixture for High Tibial Osteotomy

The present invention relates to a fixation device for proximal tibial osteotomy, and more particularly, to a fixation device for open proximal tibial osteotomy used to maintain an osteotomy gap of an open osteotomy site after osteotomy of the tibia and to fix the osteotome in a corrected state.

High tibial osteotomy is a surgical procedure that corrects the abnormal axis of the lower extremity by cutting (osteotomy) the bone close to the shinbone (tibia), thereby reducing the concentration (load) of body weight on the compartment with severe degenerative changes, transferring some of the load to the healthy joint surface, improving stress distribution and joint alignment, and reducing pain. There is an open proximal tibial osteotomy that opens the medial side of the proximal tibial osteotomy, and a closed proximal tibial osteotomy that closes the outer side of the osteotomy by removing it in a wedge shape.

These high tibial osteotomies can improve knee function, prevent the progression of osteoarthritis, and promote cartilage regeneration.

Typically, a high tibial osteotomy involves cutting the fibula close to the knee, using surgical instruments to cut the bone from the inside to the required angle, spreading it apart, performing bone grafting, and then fixing it using a metal plate and screws.

As a related art, Patent Document 1 discloses a ‘fixing device for open proximal tibial osteotomy.’

As shown in Fig. 1, this is composed of a metal block (400) for insertion between the cutting surfaces of the opened cutting site after cutting the tibia, and a plate (100) having a hole formed along the longitudinal direction in the center portion, and the metal block (400) is screw-fastened to the hole of the plate (100).

Here, the drawing symbols in the prior art are unrelated to the drawing symbols in the present invention.

KR 10-1632652 B1 2016. 06. 16. KR 10-2020-0119121 A 2020. 10. 19. KR 10-1913846 B1 2018. 10. 25. KR 10-2016-0025214 A 2016. 03. 08.

However, since the shape of the cross section of the plate (100) is formed as a curved surface in an arc shape so that it can be pressed against the outer surface of the tibia, the conventional technology has a problem in that it is impossible to move the metal block (400) in the width direction of the plate (100) or rotate it at a certain angle, making it quite difficult to flexibly press and fix it according to the size and direction of the osteotomy gap.

Accordingly, the inventor of the present invention comprehensively considered the above-mentioned various matters, and at the same time, made great efforts and continuous research to develop a novel structure for an open high tibial osteotomy fixture, in which a block for inserting the tibia between the osteotomy faces of the open osteotomy site after osteotomy and maintaining the gap of the osteotomy faces until the osteotomy site is fused (bone formed) and a plate for closely contacting the outer surface of the tibia can rotate at a certain angle with respect to each other as needed when fixing the osteotome in a corrected state, and can also freely move in the longitudinal and transverse directions of the plate, and as a result, led to the creation of the present invention.

Therefore, the technical problem and purpose to be solved by the present invention is to provide a fixation device for open proximal tibial osteotomy that allows the joint position of a block and a plate to be adjusted as needed.

The technical problems and objectives to be solved by the present invention are not limited to the technical problems and objectives mentioned above, and other technical problems and objectives not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

In order to solve the technical problem of the present invention as described above and to effectively achieve a specific technical purpose, a specific means according to an embodiment of the present invention is proposed, including a block inserted between the cut surfaces of the tibia and having a longitudinal screw hole in the left and right direction in the central portion, a plate that is in close contact with the outer surface of the tibia and has a longitudinal bolt hole in the upper and lower direction in the central portion and a plurality of clearance holes in the inner portion at regular intervals, a fastening screw that penetrates the bolt hole and is fastened to the screw hole of the block to connect the block to the plate, and a plurality of fixing screws that are fastened to the tibia through the clearance hole to fix the plate to the tibia, wherein the plate is formed as a curved surface in the shape of a cross section that is curved in an arc so as to be in close contact with the outer surface of the tibia, and a surface where the plate and the block come into contact with each other is formed as a smooth surface.

Accordingly, the present invention comprises a block for inserting between the osteotomy surfaces of an open osteotomy site after osteotomy of the tibia and maintaining the gap of the osteotomy surface (osteotomy gap) until the osteotomy site is fused, and a plate that adheres closely to the outer surface of the tibia, which can rotate at a certain angle relative to each other as needed when fixing the osteotomy of the tibia in a corrected state, and can also move freely in the longitudinal and transverse directions of the plate.

In addition, a preferred embodiment (aspect) of the present invention is that a female screw thread is formed on the inner surface of the central portion of the screw hole, and the bolt hole is formed with a counterbore for burying the head of the fastening screw, thereby enabling more stable fixation.

In addition, as a preferred embodiment (aspect) of the present invention, the block further includes a front plate that comes into contact with the smooth surface of the plate, an upper plate that protrudes rearwardly from the upper edge of the front plate and is formed integrally with an upper catch protruding and hooking on the inside of the compact bone of the tibia at the rear end, and a lower plate that protrudes rearwardly from the lower edge of the front plate at a certain interval from the upper plate and is formed integrally with a lower catch protruding and hooking on the inside of the compact bone of the tibia at the rear end, thereby making it possible to more easily adjust the joining position of the block and the plate as needed and to obtain stability.

According to an embodiment that implements the technical idea on which the unique solution is based in order to solve the technical problem of the present invention, a block for inserting between the osteotomy faces of an open osteotomy site after osteotomy of the tibia and maintaining the gap of the osteotomy faces until the osteotomy site is fused, and a plate that is pressed against the outer surface of the tibia, can rotate at a certain angle to each other and move freely in the longitudinal and width directions of the plate.

Therefore, when performing a proximal tibial osteotomy, the block can be rotated and slid to suit the shape of the osteotomy surface as needed, thereby changing the position relative to the plate, thereby more stably attaching the plate to the outer surface of the tibia, and firmly supporting and fixing the osteotomy in a corrected state.

Additionally, after a certain period of time after surgery, the blocks and plates can be removed from the tibia much more quickly and easily.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by a person skilled in the art to which the present invention pertains from the description of the claims.

Figure 1 is a schematic diagram showing a fixation device for proximal tibial osteotomy according to the prior art.
Figure 2 is an exploded perspective view of a fixation device for proximal tibial osteotomy according to an embodiment of the present invention.
FIG. 3 is a rear view showing a combined fixation device for proximal tibial osteotomy according to an embodiment of the present invention.
FIG. 4 is a perspective view showing a part of the main elements constituting a fixation device for proximal tibial osteotomy according to an embodiment of the present invention, cut and disassembled.
FIG. 5 is a cross-sectional view conceptually illustrating a state in which a block, one of the main elements constituting a fixation device for proximal tibial osteotomy according to an embodiment of the present invention, is inserted between the cutting surfaces of the tibia.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings.

Prior to this, it should be noted that the terms described below have been defined in consideration of their functions in the present invention, and should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly used or commonly recognized in the relevant technical field.

In addition, if it is determined that a detailed description of a known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description is omitted.

The drawings attached herein may be exaggerated or simplified in some parts for the purpose of explaining the composition of the technology, the operation and working principles of the technology, for ease of understanding, and for clarity of the technology, and it is disclosed that each component in the drawings does not exactly match the actual size and shape.

In addition, the term and/or in this specification means a combination of a plurality of related described items or including any item among a plurality of related described items, and when it is said that a part includes a certain component, this does not mean that other components are excluded, but rather that other components may be further included, unless specifically stated otherwise.

That is, the terms “include,” “have,” etc., used in this specification mean that there exists a feature, number, step, process, operation, component, part, or a combination thereof, but should be understood to not exclude the possibility of the existence or addition of one or more other features, numbers, steps, processes, operations, components, parts, or combinations thereof.

In addition, the terms top, bottom, upper surface, lower surface, or upper, lower, upper side, lower side, front/back, left/right, etc. used in the present invention are used for convenience to distinguish the relative positions of each component. For example, the upper part in a drawing may be named or referred to as the upper part and the lower part as the lower part, and the length direction may be named or referred to as the front/back direction, and the width direction may be named or referred to as the left/right direction.

Additionally, the terms first, second, etc. used in the present invention can be used to describe various components. That is, the terms first, second, etc. can be used only for the purpose of distinguishing one component from another component.

The main elements constituting the fixation device for proximal tibial osteotomy according to an embodiment of the present invention include a block (10), a plate (20), a fastening screw (30), and a fixing screw (40) as shown in FIGS. 2 to 5.

A block (10) is inserted between the osteotomy surfaces (B) of the opened osteotomy site after the tibia (T) is osteotomized, and maintains the gap of the osteotomy surfaces (osteotomy gap) until the upper and lower tibias are fused based on the osteotomy surfaces (B) and supports the load applied to the tibia.

And in the center of the block (10), a long screw hole (11) is drilled in the left and right directions, and on the inner surface of the center of the screw hole (11), a fastening screw (30) and a female screw thread (12) for screw fastening are formed.

That is, the screw hole (11) is formed in an elongated hole shape along the left and right directions, so that it can be easily adjusted to any position when fastening the plate (20).

Here, the block (10) is composed of a front plate (13), an upper plate (14), and a lower plate (16).

A smooth surface (19) is formed on the front surface of the front plate (13) facing the smooth surface (25) of the plate (20).

The upper plate (14) is formed integrally by protruding rearward from the upper edge of the front plate (13), and an upper catch (15) that is hooked on the inside of the compact bone (C) of the tibia (T) is formed integrally by protruding from the rear end thereof.

The lower plate (16) is formed integrally by protruding rearward from the lower edge of the front plate (13) at a certain distance from the upper plate (14), and a lower catch (17) that is caught on the inside of the compact bone (C) of the tibia (T) is formed integrally by protruding from the rear end thereof.

Accordingly, when the block (10) is inserted between the osteotomy surfaces (B) of the tibia (T), the upper plate (14) and the lower plate (16) press against the cancellous bone (S) of the tibia (T) and enter the interior thereof, and when an outward force is applied in this state, the upper catch (15) and the lower catch (17) catch on the inside of the compact bone (C) of the tibia (T) and prevent it from being removed.

In addition, the upper catch (15) and lower catch (17) increase friction with the cutting surface (B) of the tibia (T) to minimize the pull-out phenomenon in which the bone retreats while inserted between the cutting surfaces (B).

Meanwhile, the front plate (13) of the block (10) is formed in a shape that gradually widens from one side to the opposite side so as to correspond to the shape between the cut surfaces (B) of the tibia (T), and the upper plate (14) and the lower plate (16) can be formed in an inclined shape.

The plate (20) is placed vertically across the cutting surface (B) of the open cutting area after cutting the tibia (T) and is in close contact with the outer surface of the tibia (T) to support the load applied to the tibia (T) until the upper and lower tibia are fused.

And in the center of the plate (20), a bolt hole (21) in the shape of a long hole is drilled in the up-down direction, and a plurality of clearance holes (22) are drilled at regular intervals inside.

That is, the bolt hole (21) is formed in an elongated hole shape along the length of the plate (20), so that it can be easily adjusted to any position when fastening the block (10).

Additionally, a counterbore (23) is formed on the outer edge of the bolt hole (21) to receive the head of the fastening screw (30).

And the surface of the plate (20) facing the block (10) is formed as a smooth surface (29).

In addition, the plate (20) is formed into a curved surface with a cross-section that is curved in an arc shape so that it can adhere closely to the outer surface of the tibia.

Meanwhile, the plate (20) is composed of an upper plate (20a) that adheres to the upper tibia based on the osteotomy surface (B) of the tibia (T), and a lower plate (20b) that extends downward from the lower end of the upper plate past the osteotomy surface (B) of the tibia (T) and adheres to the lower tibia.

In addition, the upper plate (20a) is formed with a concave inwardly inclined surface to wrap around the raised portion of the tibia (T) to minimize the feeling of foreignness and increase the completeness of the surgery.

And the lower plate (20b) is formed in a shape that is twisted left and right around an axis line that serves as the center of its length in order to increase adhesion to the tibia (T).

The fastening screw (30) serves to attach the block (10) to the plate (20).

That is, the fastening screw (30) is formed so that its body part penetrates the bolt hole (21) and is engaged with the screw hole (11) of the block (10) and the head part is buried in the counterbore (23) of the bolt hole (21).

The fixing screw (40) serves to fix the plate (20) to the tibia.

That is, the fixed screw (40) is provided in multiple pieces so that its body is fixed by being driven into the tibia through the clearance hole (22), and its head (head) is buried in the countersink of the clearance hole (22).

Meanwhile, the fixed screw (40) forms (tapping) a screw thread identical to the screw thread into the bone tissue of the tibia (T), rotates by the pitch of the screw thread, and is inserted into the tibia (T) and embedded at the same time.

At this time, the fixed screw (40) presses the plate (20) so that it is completely in contact with the surface of the tibia (T) while retracting the cancellous bone (S) within the tibia (T), thereby preventing a gap, and suppressing various foreign substances from getting caught in the gap between the outer surface of the tibia (T) and the plate (20) and causing inflammation or unnecessary tissue growth due to organic substances, thereby maximizing the overall completion of the surgery.

According to an embodiment of the present invention, a fixture for proximal tibial osteotomy configured as described above has smooth surfaces (19) and (29) formed between the contacting surfaces of the block (10) and the plate (20), so that when fixing the cut tibia (T) in a corrected state, the block (10) inserted between the cutting surface (B) of the cut portion and the plate (20) that is pressed against the outer surface of the tibia (T) can rotate at a constant angle around the fixing screw (30), and the block (10) can be moved in the longitudinal and width directions of the plate (20) to change its position.

Accordingly, since the block (10) can rotate and slide to fit the shape of the cutting surface within the cutting area, the plate (20) can be more stably attached to the outer surface of the tibia (T), and as a result, the cut tibia (T) can be more firmly supported and fixed in a corrected state.

Meanwhile, the present invention is not limited to the above-described embodiment and the attached drawings, and can be variously modified and applied in various ways not illustrated within the scope that does not depart from the technical spirit of the present invention, and it is obvious to a person having ordinary skill in the art to which the present invention pertains that it can be widely applied by changing each component and equivalent other embodiment.

Therefore, the contents related to modifying and applying the technical features of the present invention should be interpreted as being included within the technical idea and scope of the present invention.

10: Block 11: Screw hole
19: Smooth surface 20: Plate
21: Bolt hole 22: Clearance hole
23: Counterbore 29: Smooth surface
30: Fastening screw 40: Setting screw

Claims (3)

A block (10) inserted between the osteotomy surfaces of the tibia and having a long screw hole (11) formed in the left and right direction in the center portion;
A plate (20) that adheres closely to the outer surface of the tibia and has a bolt hole (21) in the shape of a hole drilled in the upper and lower direction in the center portion and a plurality of clearance holes (22) drilled at regular intervals on the inside;
A fastening screw (30) that penetrates the above bolt hole (21) and is fastened to the screw hole (11) of the above block (10) to connect the above block (10) to the above plate (20); and
A plurality of fixing screws (40) that are driven into the tibia through the above clarity holes (22) to fix the plate (20) to the tibia;
Including,
The above plate (20) is formed into a curved surface with a cross-section that is curved in an arc shape so that it can be closely attached to the outer surface of the tibia.
A fixation device for proximal tibial osteotomy, characterized in that the surfaces where the above block (10) and the above plate (20) contact each other are formed as smooth surfaces (19) and (29), respectively.
In the first paragraph,
A female screw thread (12) for screw fastening with the fastening screw (30) is formed on the inner surface of the center portion of the screw hole (11).
A fixation device for proximal tibial osteotomy, characterized in that a counterbore (23) is formed on the outer edge of the bolt hole (21) to bury the head of the fastening screw (30).
In the first paragraph,
The above block (10) has a front plate (13) having a smooth surface (19) facing the smooth surface (29) of the above plate (20);
The upper surface plate (14) is formed integrally by protruding backward from the upper edge of the front plate (13) and having an upper catch (15) that is hooked on the inside of the tibia's compact bone at the rear end; and
A lower plate (16) formed integrally by protruding rearwardly from the lower edge of the front plate (13) at a certain distance from the upper plate (14), and having a lower catch (17) protruding at the rear end to be caught on the inside of the tibia's compact bone;
A fixation device for proximal tibial osteotomy, characterized by further including:

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