CN116407208A - Tibia bone marrow cutting external positioning device - Google Patents

Abstract

The invention discloses an external positioning device for tibia bone cutting, which comprises a height fine adjustment mechanism and a height rough adjustment mechanism, wherein the height rough adjustment mechanism comprises a positioning rod, a base and a height rough adjustment locking mechanism; thereby improving the adjustment precision of the position of the osteotomy plate.

Description

Tibia bone marrow cutting external positioning device

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to an external tibia bone marrow interception positioning device.

Background

In the process of tibial osteotomy positioning of total knee replacement, the main osteotomy positioning methods at present are of two types: extramedullary positioning and intramedullary positioning. In the extramedullary positioning osteotomies, the tibial osteotomies positioning device is one of indispensable surgical instruments, and the convenience of the use mode directly influences the surgical efficiency of a surgeon.

Currently, the tibia bone marrow cutting external positioning device adopts locking mechanisms such as a threaded knob or a cam to fix the position of a positioning rod. For a threaded knob locking mechanism, because of the limitation of the size of the instrument, the knob is generally designed to be smaller, difficult to grasp and poor in man-machine performance. In the use, in order to guarantee the locking effect, need rotatory many circles to reach the locking effect, consuming time and effort, when dismantling moreover, can have same problem, reduce operation efficiency. To cam locking mechanism, though simple structure, convenient operation, but because the fixed locating lever of mode that adopts rotatory to compress tightly belongs to the friction between metal and the metal, the instrument easily produces wearing and tearing, and life reduces, and easy inefficacy, and the frictional force between the metal surface is great, needs great strength to lock, makes just adjust the mechanism that accomplishes take place the position deviation easily.

The main function of the tibial osteotomy positioning device is to determine the position of the tibial osteotomy plate, and thus there is a need for fine adjustment. At present, a thread adjusting mode is mainly adopted in the market, a thread characteristic is generally designed on a positioning rod, a knob is sleeved on the positioning rod, a doctor adjusts the positioning rod by rotating the knob, but the knob is generally close to the leg of a patient and is easy to interfere with the leg of the patient, so that the positioning rod is inconvenient for the doctor to adjust.

Therefore, it is needed to provide a novel tibia bone marrow interception positioning device, which is convenient and quick to operate on the basis of meeting the basic functions of the device, so as to assist doctors in improving the operation efficiency, quickly completing the joint replacement of patients, and reducing the operation complications caused by the problems of longer exposed time of wounds, longer use time of tourniquets and the like.

Disclosure of Invention

The invention aims to provide a tibia bone-cutting external positioning device, which aims to solve the problems of complicated fixation and adjustment, inconvenient use, low operation efficiency and the like of the existing tibia bone-cutting external positioning device.

In order to achieve the above object, the present invention provides an external positioning device for tibia osteotomy, comprising a height fine adjustment mechanism and a height rough adjustment mechanism:

the height coarse adjustment mechanism comprises a positioning rod, a base and a height coarse adjustment locking mechanism, wherein one end of the positioning rod is movably connected with the base, and the height coarse adjustment locking mechanism is connected with the base and used for locking the base and the positioning rod;

the height fine adjustment mechanism comprises a rotating structure, a mounting platform and a height fine adjustment locking mechanism, wherein the rotating structure is rotatably arranged on the mounting platform and is in meshed transmission with the positioning rod, and the mounting platform is used for being detachably and fixedly connected with the tibia osteotomy plate; the height fine adjustment locking mechanism is connected with the mounting platform and used for locking the mounting platform and the positioning rod.

Optionally, the tibia osteotomy extra-bone marrow positioning device further comprises a transverse adjusting mechanism, wherein the transverse adjusting mechanism comprises a cross rod, a sliding seat and a transverse adjusting locking mechanism; the cross rod is intersected with the positioning rod, the sliding seat is slidably arranged on the cross rod, and the other end of the positioning rod is fixedly connected with the sliding seat; the transverse adjusting and locking mechanism is connected with the sliding seat and used for locking the sliding seat and the cross rod.

Optionally, the transverse adjusting and locking mechanism is used for being in concave-convex fit connection with the cross rod, and/or the height coarse adjusting and locking mechanism is used for being in concave-convex fit connection with the positioning rod.

Optionally, when the lateral adjustment locking mechanism is used for being in concave-convex fit connection with the cross bar, the lateral adjustment locking mechanism is configured to be capable of sliding on the sliding seat and has a locking position and an unlocking position;

when the transverse adjusting and locking mechanism is stressed to slide to the locking position, the transverse adjusting and locking mechanism is locked with the cross rod; when the transverse adjusting locking mechanism is stressed to slide to the unlocking position, the transverse adjusting locking mechanism is unlocked with the cross rod.

Optionally, an elastic element is arranged between the transverse adjustment locking mechanism and the sliding seat or the cross rod, and the elastic element drives the transverse adjustment locking mechanism to move towards the direction close to the cross rod.

Optionally, when the height coarse locking mechanism is used for being in concave-convex fit connection with the positioning rod, the height coarse locking mechanism is configured to slide on the base and has a locking position and an unlocking position;

when the height rough adjustment locking mechanism is forced to slide to the locking position, the height rough adjustment locking mechanism is locked with the positioning rod; when the height rough adjustment locking mechanism is forced to slide to the unlocking position, the height rough adjustment locking mechanism is unlocked with the positioning rod.

Optionally, an elastic element is arranged between the height rough adjustment locking mechanism and the base or the positioning rod, and the elastic element drives the height rough adjustment locking mechanism to move towards the direction close to the positioning rod.

Optionally, the transverse adjustment locking mechanism includes a movably disposed slider, the slider having at least one first limit structure, and the cross bar having a plurality of second limit structures in concave-convex engagement with the first limit structure.

Optionally, the lateral adjustment mechanism further includes a limiting pin for limiting the travel of the slider, the limiting pin is fixedly disposed on the sliding seat, and a limiting hole matched with the limiting pin is disposed on the slider.

Optionally, the locating rod movably passes through the mounting platform, one side of the locating rod is provided with a meshing tooth, and the rotating structure comprises a gear, and the tooth on the gear is used for being matched with the meshing tooth of the locating rod.

Optionally, the mounting platform has a mounting cavity therethrough, the gear is fitted into the mounting cavity from one side of the mounting cavity, and the other side of the mounting cavity is sealed by a sealing cover.

Optionally, the mounting platform has a threaded hole, the height fine adjustment locking mechanism includes a stud, the stud and the threaded hole thread fixed connection, and one end of the stud is used for abutting the locating lever to lock.

Optionally, the locating lever movably wears to locate the base, the locking mechanism of highly rough adjusting includes the locking piece of movably setting, the locking piece has third limit structure, the locating lever have with third limit structure unsmooth complex a plurality of fourth limit structure.

Optionally, the positioning rod is provided with engaging teeth on one side facing away from the predetermined object, and the engaging teeth and the fourth limiting structure are arranged on two opposite sides of the positioning rod.

In the tibia osteotomy extra-bone positioning device disclosed by the invention, the height of the tibia osteotomy plate can be adjusted through the height fine adjustment mechanism and the height rough adjustment mechanism, fine adjustment and rough adjustment of the height can be realized, the adjustment precision is high, the position of the tibia osteotomy plate can be accurately adjusted, and the accuracy of tibia osteotomy is improved. Particularly, the height fine adjustment mechanism disclosed by the invention realizes the fine adjustment of the height through the meshing transmission of the rotating structure and the positioning rod, can avoid interference with the legs of a patient during operation, reduces the operation difficulty, can realize stepless adjustment through the meshing transmission, and has high adjustment precision and simple and convenient operation.

In the tibia-osteotomy extra-marrow positioning device disclosed by the invention, the left-right distance between the tibia-osteotomy plate and the leg of a patient can be adjusted through the transverse adjusting mechanism, so that the accuracy of tibia-osteotomy is further improved.

In the tibia bone marrow intercepting and external positioning device disclosed by the invention, the transverse adjusting and locking mechanism is used for being in concave-convex fit connection with the cross rod and/or the height coarse adjusting and locking mechanism is used for being in concave-convex fit connection with the positioning rod, and in the concave-convex fit mode, locking or unlocking is preferably realized in a sliding or pressing mode, so that the problems existing in locking or unlocking by rotating a cam or a knob are avoided, the structure is simple, time and labor are saved, the structural abrasion is particularly reduced, and the service life is prolonged.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic view of the overall structure of a tibial osteotomy positioning device in accordance with a preferred embodiment of the invention;

FIG. 2 is a front view of a lateral adjustment mechanism of a preferred embodiment of the present invention;

FIGS. 3 a-3 d are schematic cross-sectional views of a cross-bar, respectively, of a preferred embodiment of the present invention;

FIG. 4 is an exploded view of a lateral adjustment mechanism of a preferred embodiment of the present invention;

FIGS. 5 a-5 c are schematic axial cross-sectional views of a spacing bump according to a preferred embodiment of the present invention;

fig. 6a to 6b are schematic perspective views of a slider according to a preferred embodiment of the present invention;

FIG. 7 is a schematic perspective view of a slider according to a preferred embodiment of the present invention;

FIG. 8 is an exploded view of the height fine adjustment mechanism of the preferred embodiment of the present invention;

FIG. 9 is a schematic view of the structure of a mounting platform according to a preferred embodiment of the present invention;

FIG. 10 is an exploded view of a coarse height adjustment mechanism according to a preferred embodiment of the present invention;

FIG. 11 is a schematic view of the structure of a positioning rod according to a preferred embodiment of the present invention;

fig. 12 is a partial structural view of a base according to a preferred embodiment of the present invention.

The reference numerals are explained as follows:

10-a transverse adjusting mechanism; 11-a cross bar; 111-inserting a nail; 11 a-limit ribs; 12-a slide; 12 a-a first cavity; 12 b-a second cavity; 12 c-connecting holes; 12 d-mounting holes; 13-a transverse adjustment locking mechanism; 131-a slider; 131 a-limit grooves; 131 b-a limiting hole; 20-a height fine adjustment mechanism; 21-a rotating structure; 211-a knob; 22-mounting a platform; 221-a mounting chamber; 222-an inner bore; 223-connecting column; 224-threaded hole; 23-height fine adjustment locking mechanism; 231-head; 24-sealing cover; 30-a height coarse adjustment mechanism; 31-positioning rod; 311-meshing teeth; 312-top; 313-limit bump; 32-a base; 32 a-an axial through hole; 32 b-a fitting cavity; 33-a height coarse adjustment locking mechanism; 331-locking block; 332-limit grooves.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings and specific examples. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. As used in this specification, the term "proximal" refers to an end relatively close to the heart; "distal" as opposed to "proximal" refers to the end that is distal to the heart. As used in this specification, the term "axial" or "height" generally refers to a direction parallel to the axis of the patient's leg, and "transverse" generally refers to a direction perpendicular to the axis of the patient's leg. The terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third", "a fourth", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more, and the meaning of "a number" is an indefinite number, such as one or more than one.

The invention discloses a tibia bone-cutting extramedullary positioning device, which has the core idea that the height of a tibia bone-cutting plate is finely adjusted by utilizing meshing transmission, so that the adjustment precision is improved, the problem of interference with the legs of a patient is avoided, the operation difficulty is reduced, and the operation efficiency is improved.

The tibia bone-cutting extramedullary positioning device disclosed by the invention mainly utilizes the sliding type or pressing type locking mechanism to lock the position of the positioning rod, and can realize the rapid locking or unlocking of the positioning rod, so that the aim of rapidly adjusting the bone-cutting position is fulfilled, the operation is simpler and more convenient, and the operation efficiency is higher.

The invention is further described below with reference to the drawings and preferred embodiments. The following embodiments and features of the embodiments may be complemented or combined with each other without conflict.

Fig. 1 illustrates an extratibial intramedullary positioning apparatus including a lateral adjustment mechanism 10, a height fine adjustment mechanism 20, and a height coarse adjustment mechanism 30, in accordance with a preferred embodiment of the present invention; wherein the coarse height adjustment mechanism 30 includes a positioning rod 31. One end (top end) of the positioning rod 31 is fixedly connected with the transverse adjusting mechanism 10, and the positioning rod 31 is also connected with the height fine adjusting mechanism 20.

The height fine adjustment mechanism 20 is further configured to be detachably and fixedly connected to a tibial osteotomy plate (not shown), and the detachable connection manner is not limited, and preferably, quick-release connection, such as a bolt connection, a buckle connection, a snap connection, etc., is adopted between the two. The tibial osteotomies plate herein may take on conventional configurations known to those skilled in the art.

The lateral adjustment mechanism 10 may actually be of a preferred construction and is used to precisely adjust the lateral distance between the entire tibial extra-medullary locating device and the leg of the patient, i.e., to adjust the lateral position of the tibial osteotomy plate, to accommodate different types of patients. The height coarse adjustment mechanism 30 is used to achieve coarse adjustment of the axial height of the tibial extra-medullary positioning device, i.e., the axial height of the tibial osteotomy plate, to accommodate different types of patients. In addition, the height fine adjustment mechanism 20 is used for achieving fine adjustment of the axial height of the tibia bone marrow external positioning device, so as to fine adjust the axial height of the tibia bone cutting plate, so as to be suitable for different types of patients.

Fig. 2 shows an exemplary embodiment of the lateral adjustment mechanism 10. As shown in fig. 2, the lateral adjustment mechanism 10 includes a cross bar 11, a slide 12, and a lateral adjustment locking mechanism 13. The cross bar 11 is disposed to intersect the positioning bar 31 and is disposed generally vertically. The proximal end of the crossbar 11 is typically provided with an insertion peg 111, the insertion peg 111 being adapted to be inserted into the tibial plateau for fixation to secure the entire tibial extra-medullary positioning device. For tibial bone, the tibial plateau portion is the portion closest to the heart, so an insertion pin 111 is provided at the proximal end of the crossbar 11.

The shape of the cross bar 11 is not required. As shown in fig. 3a, the cross-sectional shape of the cross-bar 11 is rectangular C1, as an example. In another example, as shown in fig. 3b, the cross-sectional shape of the cross-bar 11 is a circle C2. In other examples, as shown in fig. 3C, the cross-sectional shape of the cross-bar 11 is four rectangular shapes C1 with rounded right angles. Alternatively, as shown in fig. 3d, the cross-sectional shape of the cross-bar 11 is a profile C3, which can be understood as a combination of rectangular and semicircular shapes. Of course the cross-sectional shape of the cross-bar 11 is not limited to the configuration illustrated herein, but may be hexagonal, oval, triangular or other regular or irregular shapes, for example.

The slide 12 is slidably disposed on the cross bar 11, and one end of the positioning rod 31 is fixedly connected with the slide 12. The lateral positions (i.e., the lateral distance) of the positioning rod 31, the fine height adjustment mechanism 20, and the coarse height adjustment mechanism 30 are adjusted by sliding the carriage 12 left and right on the rail 11.

The lateral adjustment locking mechanism 13 is connected to the slide 12 and is used to lock the slide 12 and the rail 11, although the lateral adjustment locking mechanism 13 is also capable of unlocking the slide 12 and the rail 11. When the slide seat 12 and the cross rod 11 are interlocked through the transverse adjusting and locking mechanism 13, the slide seat 12 is fixed, so that the left-right distance of the whole tibia bone marrow external positioning device relative to the leg of a patient is limited; when the slide 12 and the cross bar 11 are mutually unlocked by the transverse adjusting and locking mechanism 13, the slide 12 can move, so that the left-right distance of the whole tibia bone marrow positioning device relative to the leg of a patient can be adjusted.

The transverse adjustment locking mechanism 13 is preferably a push type locking structure or a sliding type locking structure, so as to realize locking or unlocking in a push or sliding manner, so that the operation is more convenient by a simpler structure, the disassembly and assembly are easy, the operation efficiency is high, and particularly, the structure is not easy to wear and the service life is long. It should be understood that, when the lateral adjustment locking mechanism 13 is a push type locking structure, the lateral adjustment locking mechanism 13 can be moved to achieve unlocking or locking only by pushing; and when the transverse adjustment locking mechanism 13 is of a sliding locking structure, unlocking or locking can be realized by only sliding the transverse adjustment locking mechanism 13. The operation mode can realize quick disassembly and quick assembly, saves time and labor, and is not easy to cause the mechanism just adjusted to generate position deviation, thereby ensuring the osteotomy precision. And the locking is realized by the concave-convex matching of the transverse adjusting locking mechanism 13 and the positioning rod 31.

It should be understood that the unlocking or locking is achieved by sliding with respect to the slide 12, whether sliding or pressing, as long as it is ensured that the lateral adjustment locking mechanism 13 can slide on the slide 12. In detail, when the transverse adjustment locking mechanism 13 is in concave-convex fit connection with the cross bar 11, the transverse adjustment locking mechanism 13 can slide on the slide seat 12 and has a locking position and an unlocking position; when the transverse adjustment locking mechanism 13 is forced to slide to the locking position, the transverse adjustment locking mechanism 13 is locked with the cross bar 11; when the transverse adjustment locking mechanism 13 is forced to slide to the unlocking position, the transverse adjustment locking mechanism 13 is unlocked with the cross rod 11; the force may be simply force sliding without elastic force or force sliding in a push-type manner with elastic force.

Preferably, an elastic member is disposed between the lateral adjustment locking mechanism 13 and the slide 12 or the cross bar 11, and the elastic member drives the lateral adjustment locking mechanism 13 to move in a direction approaching the cross bar 11.

In this example, the transverse adjusting and locking mechanism 13 is a sliding locking structure, and is in concave-convex fit connection with the cross bar 11. In more detail, as shown in fig. 4, the lateral adjustment locking mechanism 13 includes a movably disposed slider 131, the slider 131 has a first limit structure, and the cross bar 11 has a second limit structure, and the second limit structure is in concave-convex fit with the first limit structure. It can be understood that one of the first limiting structure and the second limiting structure is a limiting rib, and the other is a limiting groove. The number of the second limiting structures is usually a plurality of, the second limiting structures are arranged at intervals along the extending direction of the cross bar 11, and the number of the first limiting structures is at least one. Preferably, the number of the first limiting structures is also multiple, so that the first limiting structures and the second limiting structures are matched and locked at the same time, and the locking is firmer and more reliable. It should be appreciated that the manner in which the resilient force is provided to the slider 131 may be any manner known in the art that is capable of urging the first limit structure on the slider 131 into engagement with the second limit structure on the rail 11.

With continued reference to fig. 4, the side surface of the cross bar 11 is provided with a plurality of spacing ribs 11a that are sequentially arranged, and the shape of the spacing ribs 11a is not limited. As shown in fig. 5a, in an example, the axial cross-section of the limiting rib 11a is rectangular E1. In another example, as shown in fig. 5b, the axial cross-section of the limiting bead 11a is trapezoidal E2. In other examples, as shown in fig. 5c, the axial cross-section of the limiting rib 11a is triangular E3. It should be understood that the accuracy of the left-right adjustment of the positioning rod 31 depends on the distance between the spacing ribs 11a, and the distance between the spacing ribs 11a may be set according to actual needs. Generally, the spacing distance of the spacing ribs 11a is 1mm, so that the basic tibia osteotomy requirement can be met.

As shown in fig. 7, the sliding block 131 is provided with a limiting groove 131a for matching with the limiting rib 11 a. The shape of the limit groove 131a is generally matched with the shape of the limit rib 11 a. The number of the limit grooves 131a is preferably plural, and the plurality of limit grooves 131a are sequentially arranged in a direction parallel to the sliding direction of the slider 131. When the locking device is used, the plurality of limiting grooves 131a are matched with the plurality of limiting ribs 11a for locking, so that the locking force is larger, and the locking is firmer.

Further, the lateral adjustment mechanism 10 further includes a limiting pin (not shown) for limiting the travel of the slider 131, and the limiting pin is fixedly disposed on the slider 12. As shown in fig. 7, the sliding block 131 is further provided with a limiting hole 131b, and the limiting hole 131b is used for being matched with a limiting pin to limit the sliding travel of the sliding block 131 and prevent the sliding block 131 from falling off. The limiting hole 131b is usually an oblong hole, and the long axis of the oblong hole is consistent with the sliding direction of the sliding block 131.

Fig. 6a and 6b each illustrate an exemplary structure of the carriage 12. As shown in fig. 6a and 6b, for the assembly with the rail 11, the side of the slide 12 is provided with a first cavity 12a passing through, the rail 11 passing through the first cavity 12a, the cross-sectional shape of the first cavity 12a generally corresponding to the cross-sectional shape of the rail 11. Further, the slide base 12 is provided with a second cavity 12b for assembling the slider 131. Optionally, a connecting hole 12c is provided at the bottom of the sliding base 12, for being matched and fixed with the shaft hole of the positioning rod 31. Further, the slide base 12 is further provided with a mounting hole 12d for assembling a limiting pin. The location of the mounting hole 12d is not limited, for example in the example of fig. 6a, the mounting hole 12d is provided beside the first cavity 12a, but this location is only illustrative.

In use, the cross bar 11 is inserted into the first cavity 12a in the slide 12; the sliding block 131 is slid upwards, the matching of the limit groove 131a and the limit convex rib 11a is released, and the cross rod 11 can slide freely along the first cavity 12 a; sliding the slider 131 downwards, the limit groove 131a and the limit rib 11a are matched again, so that the cross bar 11 and the sliding seat 12 can be locked.

Fig. 8 illustrates an exemplary embodiment of the height fine adjustment mechanism 20. As shown in fig. 8, the height fine adjustment mechanism 20 includes a rotation structure 21, a mounting platform 22, and a height fine adjustment locking mechanism 23. The rotating structure 21 is rotatably arranged on a mounting platform 22, and the mounting platform 22 is used for being detachably and fixedly connected with the tibia-osteotomy plate.

The rotating structure 21 is meshed with the positioning rod 31 for transmission, so that the gear and rack transmission effect is achieved, stepless adjustment is achieved, fine adjustment accuracy is guaranteed, and accuracy of tibia osteotomy is improved. The height fine adjustment locking mechanism 23 is connected with the mounting platform 22 and is used for locking the mounting platform 22 and the positioning rod 31 so that the mounting platform 22 is fixed relative to the positioning rod 31; of course, the height fine adjustment locking mechanism 23 can also release the locking between the positioning rod 31 and the mounting platform 22, so that the mounting platform 22 can move up and down relative to the positioning rod 31, thereby achieving the purpose of moving the tibial osteotomy plate up and down. It should be understood that, when fine adjustment is performed, the positioning rod 31 is stationary up and down, and when the rotating structure 21 is operated to rotate, the mounting platform 22 is driven to move up and down along the positioning rod 31, so that the mounting platform 22 drives the tibial osteotomy plate to move up and down.

Referring to fig. 11, a part of the length of the positioning rod 31 is provided with a meshing tooth 311 for meshing with the rotating structure 21, and at this time, the positioning rod 31 corresponds to a rack and the rotating structure 21 corresponds to a gear. The engagement teeth 311 are typically provided on the side of the positioning rod 31 facing away from the patient's leg (i.e., the intended subject). In addition, the top end 312 of the positioning rod 31 is fixedly connected to the slide 12. The tooth shape of the positioning rod 31 when engaged with the rotating structure 21 is not limited, and the engagement form may be straight tooth engagement or helical tooth engagement.

Referring back to fig. 8, the rotating structure 21 may be configured with a knob 211, so that an operator can rotate the rotating structure 21 through the knob 211. Referring to fig. 9, the mounting platform 22 is provided with a mounting chamber 221 for assembling the rotating structure 21. The mounting chamber 221 may extend from one side of the mounting platform 22 to the opposite side. In use, the rotating structure 21 is fitted into the mounting chamber 221 from one side of the mounting chamber 221, and the other side of the mounting chamber 221 is sealed by the sealing cover 24.

As an example, the mounting platform 22 is further provided with a through hole 222 for assembling the positioning rod 31, and the positioning rod 31 movably passes through the hole 222. The inner hole 222 can also guide the moving direction of the mounting platform 22, so as to ensure the rectilinear motion precision. The shape of the inner hole 222 is not limited and generally matches the shape of the positioning rod 31. As an example, two connecting posts 223 are provided on the side of the mounting platform 22 near the leg of the patient for connecting the tibial osteotomy plate, and other connecting structures may be provided to connect with the tibial osteotomy plate according to the design of the tibial osteotomy plate.

Referring to fig. 8, the height fine adjustment locking mechanism 23 may be a stud, which is fixedly connected with the mounting platform 22 through threads, and presses against the positioning rod 31 at the same time, so as to achieve the effect of pressing the locking positioning rod 31 and the mounting platform 22. For example, as shown in fig. 9, the mounting platform 22 is provided with a threaded hole 224 for assembling a stud. In the mode of pressing the positioning rod 31 by the stud, the structure is simple, the operation is convenient, and the locking effect is good. The stud can be provided with a head 231, so that an operator can conveniently rotate the stud to lock or unlock through the head 231.

When in use, the positioning rod 31 is inserted into the inner hole 222 of the mounting platform 22, the knob 211 of the rotating structure 21 is rotated, the position of the tibia osteotomy plate can be adjusted up and down, and the rotating stud can fix the height fine adjustment mechanism 20 at any position of the positioning rod 31, so that the locking of the height fine adjustment mechanism 20 is realized.

Fig. 10 illustrates an exemplary embodiment of coarse height adjustment mechanism 30. As shown in FIG. 10, the coarse height adjustment mechanism 30 includes a positioning rod 31, a base 32, and a coarse height adjustment locking mechanism 33. The other end (bottom end) of the positioning rod 31 is movably connected with the base 32. The height rough lock mechanism 33 is connected to the base 32 and is used to lock the base 32 and the positioning rod 31, and the height rough lock mechanism 33 is also capable of releasing the lock between the base 32 and the positioning rod 31. When the positioning rod 31 and the base 32 are interlocked and fixed through the height rough adjusting locking mechanism 33, the positioning rod 31 is fixed, so that the height of the whole tibia bone marrow external positioning device relative to the leg of a patient is limited; when the lock between the positioning rod 31 and the base 32 is released, the positioning rod 31 is allowed to move up and down, thereby roughly adjusting the height of the entire tibial bone marrow positioning device relative to the patient's leg. Furthermore, the height adjustment locking mechanism 33 is preferably coupled with the positioning rod 31 in a male-female fit.

The height adjustment locking mechanism 33 is preferably implemented as a push type locking mechanism or a slide type locking mechanism. The sliding locking or push locking here is basically the same principle as the above-described laterally adjustable locking mechanism 13. Specifically, the height coarse locking mechanism 33 is capable of sliding on the base 32 and has a locked position and an unlocked position; when the height rough adjustment locking mechanism 33 is forced to slide to the locking position, the height rough adjustment locking mechanism 33 is locked with the positioning rod 31; when the height coarse locking mechanism 33 is forced to slide to the unlocked position, the height coarse locking mechanism 33 is unlocked from the positioning rod 31. Similarly, the force may be simply force sliding without elastic force, or force sliding in a push-type manner with elastic force. And no matter what locking mode is adopted, the height rough adjusting locking mechanism 33 is arranged on one side of the positioning rod 31 away from the leg of the patient, so that interference with the leg of the patient during operation is avoided, and the use is convenient. It will also be appreciated that the sliding locking or unlocking herein employs the structure of the slider described above, and will not be described in detail.

In this example, the height coarse adjustment locking mechanism 33 is a push type locking structure, and specifically includes a locking block 331 that is movably disposed, the locking block 331 has a third limiting structure, and the positioning rod 31 has a plurality of fourth limiting structures that are matched with the third limiting structure in a concave-convex manner. One of the third limit structure and the fourth limit structure is a limit protrusion, and the other is a limit groove matched with the limit protrusion.

As shown in fig. 11, in this embodiment, the lower portion of the positioning rod 31 is provided with a plurality of limiting protrusions 313, the number of the limiting protrusions 313 is usually a plurality of limiting protrusions 313, and the size of the spacing distance between the plurality of limiting protrusions 313 determines the precision of the coarse adjustment, and the spacing distance should also be set according to the actual adjustment requirement. The shape of the limit projection 313 is not limited, and for example, reference may be made to the shape of the limit bead 11a on the cross bar 11.

Referring to fig. 10, the locking piece 331 is provided with a limiting groove 332 for cooperating with the limiting protrusion 313 of the positioning rod 31. Preferably, the number of the limiting grooves 332 on the locking piece 331 is multiple, so that the plurality of limiting grooves 332 are matched with the plurality of limiting protrusions 313 at the same time, and locking is firmer.

Referring to fig. 11, in a preferred embodiment, the positioning rod 31 is provided with engaging teeth 311 at an upper portion and a spacing protrusion 313 at a lower portion, and the engaging teeth 311 and the spacing protrusion 313 are disposed at opposite sides of the positioning rod 31.

As shown in fig. 12, and in combination with fig. 10, the base 32 is provided with an axial through hole 32a for inserting the positioning rod 31, that is, the positioning rod 31 is movably inserted through the base 32. The side surface of the base 32 is also provided with an assembling cavity 32b, which is communicated with the axial through hole 32a, and the assembling cavity 32b is used for assembling the locking block 331.

When in use, the limiting groove 332 on the locking block 331 can be separated from the limiting protrusion 313 on the positioning rod 31 by pressing the locking block 331, and the vertical height of the positioning rod 31 can be freely adjusted at the moment, otherwise, when the locking block 331 is released, the limiting groove 332 can be matched with the limiting protrusion 313, so that the purpose of locking the positioning rod 31 is achieved. The means for providing the elastic force to the locking piece 331 may be any means known in the art, as long as the limit groove 332 is driven to cooperate with the limit protrusion 313 (move rightward in fig. 10), for example, an elastic member is provided between the base 32 and the coarse height locking mechanism 33, or an elastic member is provided between the positioning rod 31 and the coarse height locking mechanism 33, and the coarse height locking mechanism 33 is driven to move rightward by the elastic member. The elastic member is an elastic body such as a spring or rubber.

It should be appreciated that while the above lateral adjustment mechanism 10 is a sliding lock or unlock and the coarse height adjustment mechanism 30 is a push lock or unlock, in practice the two securing means may be interchanged, but corresponding modifications in construction are required, which are readily available to those skilled in the art and will not be described in detail.

In summary, the tibia outside-bone-cutting positioning device disclosed by the invention can be used for rapidly locking or unlocking the sliding seat, and the operation is simple and convenient. In addition, through combining gear rack transmission mode and unsmooth spacing mode, can realize that shin bone cuts the bone lamella regulation mode and switch each other between quick regulation and fine adjustment, shin bone cuts bone lamella position adjustment more accurate, cuts the bone accuracy higher. In addition, the pressing type locking and fixing mode of the positioning rod avoids complicated rotating and locking steps, has excellent man-machine performance, and can effectively avoid the interference problem with the legs of a patient during operation. In general, the positioning device disclosed by the invention can greatly improve the operation efficiency of doctors and reduce a series of operation complications of patients caused by overlong operation time.

It should be noted that several modifications and additions will be possible to those skilled in the art without departing from the method of the invention, which modifications and additions should also be considered as within the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when made with the changes, modifications, and variations to the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims (14)

1. An external positioning device for tibia bone interception, which is characterized by comprising a height fine adjustment mechanism and a height rough adjustment mechanism:

the height rough adjustment mechanism comprises a positioning rod, a base and a height rough adjustment locking mechanism; one end of the positioning rod is movably connected with the base; the height rough adjustment locking mechanism is connected with the base and used for locking the base and the positioning rod;

the height fine adjustment mechanism comprises a rotating structure, an installation platform and a height fine adjustment locking mechanism; the rotating structure is rotatably arranged on the mounting platform and meshed with the positioning rod for transmission; the mounting platform is used for being detachably and fixedly connected with the tibia osteotomy plate; the height fine adjustment locking mechanism is connected with the mounting platform and used for locking the mounting platform and the positioning rod.

2. The tibial resection extra-medullary positioning device of claim 1, further comprising a lateral adjustment mechanism comprising a cross bar, a slide, and a lateral adjustment locking mechanism; the cross rod is intersected with the positioning rod, the sliding seat is slidably arranged on the cross rod, and the other end of the positioning rod is fixedly connected with the sliding seat; the transverse adjusting and locking mechanism is connected with the sliding seat and used for locking the sliding seat and the cross rod.

3. The tibial resection extra-bone marrow positioning device of claim 2, wherein the lateral adjustment locking mechanism is configured to be matingly coupled to the cross bar and/or the height adjustment locking mechanism is configured to be matingly coupled to the positioning bar.

4. The tibial resection extra-bone positioning apparatus of claim 3 wherein the lateral adjustment locking mechanism is configured to slide on the slide and has a locked position and an unlocked position when the lateral adjustment locking mechanism is used in a male-female mating connection with the cross bar;

when the transverse adjusting and locking mechanism is stressed to slide to the locking position, the transverse adjusting and locking mechanism is locked with the cross rod; when the transverse adjusting locking mechanism is stressed to slide to the unlocking position, the transverse adjusting locking mechanism is unlocked with the cross rod.

5. The external tibial resection positioning device according to claim 4, wherein an elastic member is disposed between the lateral adjustment locking mechanism and the slide or the cross bar, and the elastic member drives the lateral adjustment locking mechanism to move in a direction approaching the cross bar.

6. The tibial resection extra-bone positioning apparatus of claim 3 wherein the height coarse locking mechanism is configured to slide on the base and has a locked position and an unlocked position when the height coarse locking mechanism is used in a male-female mating connection with the positioning rod;

when the height rough adjustment locking mechanism is forced to slide to the locking position, the height rough adjustment locking mechanism is locked with the positioning rod; when the height rough adjustment locking mechanism is forced to slide to the unlocking position, the height rough adjustment locking mechanism is unlocked with the positioning rod.

7. The external tibial resection positioning device of claim 6, wherein an elastic member is disposed between the height coarse locking mechanism and the base or the positioning rod, the elastic member driving the height coarse locking mechanism to move in a direction toward the positioning rod.

8. The tibial resection extramedullary positioning device of claim 2, wherein the lateral adjustment locking mechanism comprises a movably disposed slider having at least one first limit structure, the cross bar having a plurality of second limit structures that are in a concave-convex engagement with the first limit structures.

9. The tibial resection extra-bone marrow positioning apparatus of claim 8 wherein the lateral adjustment mechanism further includes a stop pin for limiting the travel of the slider, the stop pin being fixedly disposed on the slider and the slider being provided with a stop hole that mates with the stop pin.

10. The tibial resection extra-bone marrow positioning device of claim 1 wherein the positioning rod is movably threaded through the mounting platform, one side of the positioning rod is provided with engagement teeth, and the rotating structure includes a gear with teeth on the gear for mating with the engagement teeth of the positioning rod.

11. The tibial resection extramedullary positioning device of claim 10 wherein the mounting platform has a mounting cavity therethrough, the gear being received into the mounting cavity from one side of the mounting cavity and the other side of the mounting cavity being sealed by a sealing cover.

12. The tibial resection extra-bone marrow positioning device of claim 10 wherein the mounting platform has a threaded bore, the height fine adjustment locking mechanism includes a stud that is threadably fixedly connected to the threaded bore, and one end of the stud is adapted to abut the positioning rod for locking.

13. The tibial resection extramedullary positioning device of claim 1, wherein the positioning rod movably passes through the base, the height coarse adjustment locking mechanism comprises a movably arranged locking block, the locking block has a third limiting structure, and the positioning rod has a plurality of fourth limiting structures which are matched with the third limiting structure in a concave-convex manner.

14. The tibial resection extra-bone positioning device of claim 13 wherein the positioning rod is provided with engagement teeth on a side facing away from the predetermined object, the engagement teeth and the fourth limit structure being provided on opposite sides of the positioning rod.

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