CN217390808U

CN217390808U - External positioning device for tibia marrow cutting

Info

Publication number: CN217390808U
Application number: CN202123429425.9U
Authority: CN
Inventors: 孙延东; 黄欢欢; 朱瑞; 汪一翔
Original assignee: Suzhou Microport Orthorecon Co Ltd
Current assignee: Suzhou Microport Orthorecon Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-09-09
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a tibia osteotomy bone marrow external positioning device, which comprises a height fine adjustment mechanism and a height coarse adjustment mechanism, wherein the height coarse adjustment mechanism comprises a positioning rod, a base and a height coarse adjustment locking mechanism, one end of the positioning rod is movably connected with the base, 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, an installation platform and a height fine adjustment locking mechanism, the rotating structure is rotatably arranged on the installation platform and is meshed with the positioning rod for transmission, the installation platform is detachably and fixedly connected with a tibia osteotomy plate, and the height fine adjustment locking mechanism is connected with the installation platform and used for locking the installation platform and the positioning rod; thereby improving the adjustment precision of the position of the osteotomy plate.

Description

External positioning device for tibia marrow cutting

Technical Field

The utility model belongs to the technical field of medical instrument, in particular to external positioning device for tibia marrow cutting.

Background

In the total knee replacement tibia osteotomy positioning process, the current main osteotomy positioning methods have two types: extramedullary positioning and intramedullary positioning. In the extramedullary positioning osteotomy, the tibia cutting extramedullary positioning device is one of indispensable surgical instruments, and the operation efficiency of a surgeon is directly influenced by the convenience of the use mode of the extramedullary positioning device.

At present, the tibia marrow cutting external positioning device mostly adopts a locking mechanism 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 size limitation of the instrument, the knob is generally designed to be small, difficult to grasp and poor in man-machine performance. In the use, in order to guarantee the locking effect, need rotatory many rings to reach the locking effect, consuming time and wasting force, when dismantling moreover, can have same problem, reduce operation efficiency. The cam locking mechanism is simple in structure and convenient to operate, but the positioning rod is fixed in a rotary compression mode, so that the friction between metal and metal is generated, tools are easy to wear, the service life is shortened, the tools are easy to lose efficacy, the friction between metal surfaces is large, large force is needed for locking, and the mechanism which is just adjusted is easy to deviate in position.

The main function of the tibial osteotomy extramedullary positioning device is to determine the position of the tibial osteotomy plate, and thus, there is a need for fine adjustment. And at present on the market mainly adopt screw thread regulation mode, generally design the screw thread characteristic on the locating lever, the knob cover is on the locating lever, and the doctor adjusts through the rotating knob, but patient's shank is generally pressed close to the knob, produces the interference with patient's shank easily, therefore the doctor of not being convenient for adjusts the operation.

Therefore, it is highly desirable to provide a novel external positioning device for cutting bone marrow with tibia, which is convenient and fast to operate on the basis of satisfying the basic functions thereof, so as to assist the doctor to improve the operation efficiency, complete the joint replacement of the patient quickly, and reduce the operation complications caused by the problems of long exposed time of the wound, long use time of the tourniquet, and the like.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a shin bone cuts extramedullary positioner to solve the fixed loaded down with trivial details, the inconvenient, the inefficiency scheduling problem of operation of adjusting that current shin bone cuts extramedullary positioner exists.

In order to achieve the above object, the utility model provides a tibia bone marrow external positioning device, it includes high fine-tuning and high coarse-tuning:

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

Optionally, the external tibial bone marrow cutting positioning device further comprises a transverse adjusting mechanism, wherein the transverse adjusting mechanism comprises a cross rod, a sliding seat and a transverse adjusting and 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 locking mechanism is used for being in concave-convex fit connection with the cross rod, and/or the height coarse adjusting locking mechanism is used for being in concave-convex fit connection with the positioning rod.

Optionally, when the transverse adjusting locking mechanism is used for being in concave-convex fit connection with the cross rod, the transverse adjusting 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 locking mechanism is stressed to slide to the locking position, the transverse adjusting locking mechanism is locked with the cross rod; and when the transverse adjusting locking mechanism slides to the unlocking position under the stress, the transverse adjusting locking mechanism is unlocked with the transverse rod.

Optionally, an elastic member is disposed between the lateral adjustment locking mechanism and the sliding seat or the cross bar, and the elastic member drives the lateral adjustment locking mechanism to move in a direction close to the cross bar.

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

when the height coarse adjustment locking mechanism slides to the locking position under stress, the height coarse adjustment locking mechanism is locked with the positioning rod; and when the height coarse adjustment locking mechanism slides to the unlocking position under the stress, the height coarse adjustment locking mechanism is unlocked with the positioning rod.

Optionally, an elastic member is disposed between the height coarse adjustment locking mechanism and the base or the positioning rod, and the elastic member drives the height coarse adjustment locking mechanism to move in a direction approaching the positioning rod.

Optionally, the transverse adjusting locking mechanism comprises a movably arranged sliding block, the sliding block is provided with at least one first limiting structure, and the cross rod is provided with a plurality of second limiting structures in concave-convex fit with the first limiting structure.

Optionally, the transverse adjusting mechanism further comprises a limit pin for limiting the stroke of the sliding block, the limit pin is fixedly arranged on the sliding seat, and a limit hole matched with the limit pin is formed in the sliding block.

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

Optionally, the mounting platform has a through mounting chamber, the gear is loaded into the mounting chamber from one side of the mounting chamber, and the other side of the mounting chamber 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 is in threaded fixed connection with the threaded hole, and one end of the stud is used for abutting against the positioning rod to lock.

Optionally, the positioning rod is movably disposed through the base, the height coarse adjustment locking mechanism includes a movably disposed locking block, the locking block has a third limiting structure, and the positioning rod has a plurality of fourth limiting structures that are in concave-convex fit with the third limiting structure.

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

The utility model discloses an among the external positioner of shin bone section marrow, through the height that highly fine-tuning constructs and highly coarse adjustment mechanism adjustable shin bone section board, highly can realize fine setting and coarse adjustment moreover, adjust the precision height, can adjust the position of cutting the bone board accurately, promote the shin bone and cut the accurate nature of bone. Particularly, the utility model discloses a fine-tuning of height mechanism realizes the fine-tuning of height through the meshing transmission of rotating-structure and locating lever, produces with patient's shank when can avoiding operating and interferes, reduces the operation degree of difficulty, and stepless regulation can be realized to this meshing transmission moreover, adjusts the precision height, easy operation, convenience.

The utility model discloses an among the external positioner of marrow is cut to shin bone, still can adjust the shin bone through horizontal adjustment mechanism and cut the distance about the bone plate is relative to patient's shank, further promote the shin bone and cut the accurate nature of bone.

The utility model discloses an among the external positioner of shin bone marrow, horizontal regulation locking mechanism is used for being connected with the unsmooth cooperation of horizontal pole, and/or, high coarse adjustment locking mechanism is used for being connected with the unsmooth cooperation of locating lever, and in this kind of unsmooth cooperation mode, locking or unblock are realized through the mode that slides or press to the preferred to avoid cam or knob rotation to lock or the problem that exists when unblock, not only simple structure, labour saving and time saving moreover especially can also reduce structural wear, improves life.

Drawings

The accompanying drawings are included to provide a better understanding of the present invention and are not intended to constitute an undue limitation on the invention. Wherein:

fig. 1 is a schematic view of the overall structure of a tibia bone marrow cutting external positioning device according to a preferred embodiment of the present invention;

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

fig. 3a to 3d are schematic cross-sectional views of a cross bar according to a preferred embodiment of the present invention;

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

fig. 5a to 5c are schematic axial cross-sectional views of a limiting protrusion according to a preferred embodiment of the present invention;

fig. 6a to 6b are schematic perspective views of a slide seat 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 structural view of a mounting platform according to a preferred embodiment of the present invention;

fig. 10 is an exploded view of the height coarse adjustment mechanism of the preferred embodiment of the present invention;

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

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

The reference numerals are explained below:

10-a lateral adjustment mechanism; 11-a cross-bar; 111-insert pin; 11 a-a limit convex rib; 12-a slide; 12 a-a first cavity; 12 b-a second cavity; 12 c-a connection hole; 12 d-mounting holes; 13-transversely adjusting the locking mechanism; 131-a slider; 131 a-a limiting groove; 131 b-a limiting hole; 20-height fine adjustment mechanism; 21-a rotating structure; 211-a knob; 22-a mounting platform; 221-a mounting chamber; 222-an inner bore; 223-connecting column; 224-threaded hole; 23-height fine adjustment locking mechanism; 231-a head; 24-a sealing cover; 30-a height coarse adjustment mechanism; 31-a positioning rod; 311-meshing teeth; 312-top end; 313-a limit protrusion; 32-a base; 32 a-axial through hole; 32 b-an assembly chamber; 33-height coarse adjustment locking mechanism; 331-a locking block; 332-a limit groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. 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 simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present 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 distal to the heart. As used in this specification, the terms "axial" or "height" generally refer to a direction parallel to the axis of a patient's leg, and "transverse" generally refers to a direction perpendicular to the axis of a patient's leg. The terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, features defined as "first," "second," "third," "fourth," etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "a plurality" means two or more, and "a plurality" means an indefinite number, such as one or more than one.

The utility model discloses a shin bone cuts extramedullary positioner, its core thought lies in utilizing the meshing transmission to come the height that finely adjusted shin bone cuts the lamella, not only improves the regulation precision, but also avoids the problem of interfering with patient's shank to reduce the operation degree of difficulty of performing the operation, improve operation efficiency.

The utility model discloses a shin bone cuts outer positioner of marrow mainly utilizes slidingtype or push type locking mechanism to lock the position of locating lever, can realize the quick locking or the unblock of locating lever to reach the purpose that quick adjustment cut the bone position, the operation is more simple and convenient, and operation efficiency is higher.

The invention will be further described with reference to the accompanying drawings and preferred embodiments. In the following embodiments, features of the embodiments can be supplemented with each other or combined with each other without conflict.

Fig. 1 shows a tibial extramedullary positioning device disclosed in the preferred embodiment of the present invention, which comprises a transverse adjusting mechanism 10, a height fine-adjusting mechanism 20 and a height coarse-adjusting mechanism 30; wherein the height coarse 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 further connected with the height fine adjusting mechanism 20.

The height fine adjustment mechanism 20 is also used for detachably and fixedly connecting with a tibia fragment plate (not shown), the detachable connection mode is not limited in any way, and a quick-release connection, such as a bolt connection, a snap connection and the like, is preferably adopted between the height fine adjustment mechanism and the tibia fragment plate. The tibial resection plate herein may take on conventional configurations known to those skilled in the art.

The lateral adjustment mechanism 10 may actually be the preferred configuration and is used to precisely adjust the lateral distance between the overall tibial extramedullary positioning device and the patient's leg, i.e., to adjust the lateral position of the tibial osteotomy plate, to accommodate different types of patients. The coarse height adjustment mechanism 30 is used to achieve coarse adjustment of the axial height of the tibial extramedullary positioning device, i.e., coarse adjustment of the axial height of the tibial osteotomy plate, to accommodate different types of patients. In addition, the height fine adjustment mechanism 20 is used to achieve fine adjustment of the axial height of the tibial extramedullary positioning device to fine adjust the axial height of the tibial osteotomy plate for different types of patients.

FIG. 2 illustrates an exemplary embodiment of the lateral adjustment mechanism 10. As shown in fig. 2, the lateral adjustment mechanism 10 includes a crossbar 11, a slide 12, and a lateral adjustment locking mechanism 13. The cross bar 11 is disposed across the positioning bar 31, and is disposed generally vertically. The proximal end of the cross bar 11 is typically provided with an insertion peg 111, and the insertion peg 111 is configured to be inserted into the tibial plateau and provide a fixation function to fix the entire tibial extramedullary positioning device. For tibial bone, the tibial plateau portion is the closest portion to the heart, so an insertion peg 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 crossbar 11 is rectangular C1, as an example. In another example, as shown in fig. 3b, the cross-sectional shape of the crossbar 11 is a circle C2. In other examples, as shown in fig. 3C, the cross-sectional shape of the crossbar 11 is four right-angle rounded rectangles C1. Alternatively, as shown in fig. 3d, the cross-sectional shape of the cross-bar 11 is a special shape 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 exemplified herein, and may be, for example, hexagonal, elliptical, triangular, or other regular or irregular shapes.

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

The lateral adjustment locking mechanism 13 is connected to the sliding base 12 and is used for locking the sliding base 12 and the cross bar 11, and of course, the lateral adjustment locking mechanism 13 can also release the locking between the sliding base 12 and the cross bar 11. When the sliding seat 12 is interlocked with the cross rod 11 through the transverse adjusting locking mechanism 13, the sliding seat 12 is fixed, thereby limiting the left-right distance of the whole tibiomedullary positioning device relative to the leg of the patient; when the slide carriage 12 and crossbar 11 are unlocked from each other by the lateral adjustment locking mechanism 13, the slide carriage 12 is movable so that the left-right distance of the entire extratibial medullary positioning apparatus relative to the patient's leg can be adjusted.

The transverse adjusting locking mechanism 13 is preferably a pressing type locking structure or a sliding type locking structure, so as to realize locking or unlocking in a pressing or sliding manner, and realize locking or unlocking in a simpler structure, so that the operation is more convenient, the disassembly and the assembly are easy, the operation efficiency is high, particularly, the structure is not easy to wear, and the service life is long. It should be understood that, when the transverse adjusting locking mechanism 13 is a press type locking structure, the transverse adjusting locking mechanism 13 can be moved to realize unlocking or locking only by pressing; when the transverse adjusting locking mechanism 13 is a sliding type locking mechanism, unlocking or locking can be realized only by sliding the transverse adjusting locking mechanism 13. By the operation mode, quick detachment and quick installation can be realized, time and labor are saved, the mechanism which is just adjusted is not easy to shift, and the osteotomy precision is ensured. And the transverse adjusting locking mechanism 13 and the positioning rod 31 are locked through concave-convex matching.

It will be appreciated that the unlocking or locking is achieved by sliding relative to the carriage 12, whether sliding or pressing, provided that the laterally adjustable locking mechanism 13 is guaranteed to be able to slide on the carriage 12. In detail, when the transverse adjusting locking mechanism 13 is in concave-convex fit connection with the cross bar 11, the transverse adjusting locking mechanism 13 can slide on the sliding seat 12 and has a locking position and an unlocking position; when the transverse adjusting locking mechanism 13 is forced to slide to the locking position, the transverse adjusting locking mechanism 13 is locked with the cross rod 11; when the transverse adjusting locking mechanism 13 is forced to slide to the unlocking position, the transverse adjusting locking mechanism 13 is unlocked with the cross rod 11; the force applied here can be simply applied to slide without elastic force, or applied to slide in a pressing manner under the condition of elastic force.

Preferably, an elastic member is disposed between the lateral adjustment locking mechanism 13 and the sliding seat 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 locking mechanism 13 is a sliding locking mechanism, and is connected with the cross bar 11 in a concave-convex matching manner. In more detail, as shown in fig. 4, the lateral adjustment locking mechanism 13 includes a movably disposed sliding block 131, the sliding block 131 has a first limiting structure, and the cross bar 11 has a second limiting structure, and the second limiting structure is in concave-convex fit with the first limiting structure. It can be understood that one of the first limiting structure and the second limiting structure is a limiting convex rib, and the other one of the first limiting structure and the second limiting structure is a limiting groove. The number of the second limit structures is usually a plurality of, the second limit structures are arranged at intervals along the extending direction of the cross rod 11, and the number of the first limit structures is at least one. Preferably, the number of the first limiting structures is also multiple, so that the first limiting structures are matched and locked with the second limiting structures simultaneously, and locking is firmer and more reliable. It should be appreciated that the manner of providing the resilient force to the slider 131 may be any manner known in the art as long as the first limit feature on the slider 131 is urged to cooperate with the second limit feature on the rail 11.

With reference to fig. 4, the side surface of the cross bar 11 is provided with a plurality of limiting ribs 11a arranged in sequence, and the shape of the limiting ribs 11a is not limited. As shown in fig. 5a, the axial cross-sectional shape of the stopper rib 11a is a rectangle E1. In another example, as shown in fig. 5b, the axial cross-sectional shape of the stopper rib 11a is a trapezoid E2. In other examples, as shown in fig. 5c, the axial cross-sectional shape of the stopper rib 11a is a triangle E3. It should be understood that the accuracy of the left-right adjustment of the positioning rod 31 depends on the distance between the limiting ribs 11a, and the distance between the limiting ribs 11a can be set according to actual needs. Generally, the spacing distance of the limiting convex ribs 11a is 1mm, and the basic tibial 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 convex rib 11 a. The shape of the limiting groove 131a is generally matched with the shape of the limiting convex rib 11 a. The number of the stopper grooves 131a is preferably plural, and the plural stopper grooves 131a are sequentially arranged in a direction parallel to the sliding direction of the slider 131. During the use, a plurality of spacing grooves 131a lock with the cooperation of a plurality of spacing protruding muscle 11a simultaneously, and locking force is bigger, and locking is more firm.

Further, the lateral adjustment mechanism 10 further includes a limit pin (not shown) for limiting the stroke of the slider 131, and the limit pin is fixedly disposed on the sliding base 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 stroke of the sliding block 131 and prevent the sliding block 131 from falling off. The limiting hole 131b is generally an elongated circular hole, and the long axis of the elongated circular hole is aligned with the sliding direction of the slider 131.

Fig. 6a and 6b each illustrate an exemplary structure of the carriage 12. As shown in fig. 6a and 6b, in order to be assembled with the crossbar 11, the side of the sliding base 12 is provided with a first through cavity 12a, the crossbar 11 passes through the first through cavity 12a, and the cross-sectional shape of the first through cavity 12a generally conforms to the cross-sectional shape of the crossbar 11. Further, a second cavity 12b is provided on the carriage 12 for fitting the slider 131. Optionally, the bottom of the sliding base 12 is provided with a connecting hole 12c for fitting and fixing with the shaft hole of the positioning rod 31. Further, the sliding base 12 is further provided with a mounting hole 12d for assembling a limit pin. The location of the mounting hole 12d is not limited, for example, in the example of fig. 6a, the mounting hole 12d is arranged beside the first cavity 12a, but this location is only for illustration.

In use, the crossbar 11 is inserted into a first cavity 12a in the slide 12; the slide block 131 slides upwards, and the matching between the limiting groove 131a and the limiting convex rib 11a is released, so that the cross rod 11 can freely slide along the first cavity 12 a; the slide block 131 is slid downwards, the limiting groove 131a and the limiting rib 11a are re-engaged, and the cross bar 11 and the slide carriage 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 rotating 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 tibial osteotomy plate.

Wherein rotating-structure 21 and locating lever 31 meshing transmission reach rack and pinion driven effect to realize the infinitely variable control, ensure the precision of fine setting, in order to improve the precision nature of shin bone osteotomy volume. The height fine-adjustment locking mechanism 23 is connected with the mounting platform 22 and 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 unlock 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 operation rotating structure 21 rotates, 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 an engaging tooth 311 for engaging and driving with the rotating structure 21, in this case, the positioning rod 31 corresponds to a rack, and the rotating structure 21 corresponds to a gear. The engagement teeth 311 are generally disposed on a side of the positioning rod 31 facing away from the patient's leg (i.e., the predetermined object). The tip 312 of the positioning rod 31 is fixedly connected to the carriage 12. The tooth shape of the positioning rod 31 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 provided with a knob 211, so that an operator can rotate the rotating structure 21 by turning the knob 211. Referring to fig. 9, the mounting platform 22 is provided with a mounting chamber 221 for mounting the rotating structure 21. The mounting chamber 221 may extend through the mounting platform 22 from one side to the opposite side. In use, the rotating structure 21 is loaded 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 inner hole 222 for assembling the positioning rod 31, and the positioning rod 31 movably passes through the inner hole 222. The inner hole 222 can also guide the moving direction of the mounting platform 22, and ensure the linear 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, the mounting platform 22 is provided with two connecting posts 223 on a side thereof adjacent to the leg of the patient for connecting to a tibial osteotomy plate, and other connecting structures may be provided for connecting to the tibial osteotomy plate depending on the design of the tibial osteotomy plate.

Referring to fig. 8, the height fine-tuning locking mechanism 23 can be selected as a stud, which is fixedly connected to the mounting platform 22 by a screw thread and presses against the positioning rod 31, so as to achieve the effect of tightly locking the positioning rod 31 and the mounting platform 22. For example, as shown in fig. 9, the mounting platform 22 is provided with threaded holes 224 for mounting studs. In the mode of utilizing the double-screw bolt to compress tightly locating lever 31, simple structure, convenient operation, locking is effectual. The stud can be provided with a head 231, so that an operator can conveniently rotate the stud through the head 231 to lock or unlock.

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, so that the position of the tibia osteotomy plate can be adjusted up and down, and the height fine adjustment mechanism 20 can be fixed at any position of the positioning rod 31 by rotating the stud, so that the height fine adjustment mechanism 20 is locked.

Fig. 10 illustrates an exemplary embodiment of height coarse 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 lock mechanism 33. The other end (bottom end) of the positioning rod 31 is movably connected with the base 32. The coarse height adjustment lock mechanism 33 is connected to the base 32 and locks the base 32 and the positioning rod 31, and the coarse height adjustment lock mechanism 33 also releases the lock between the base 32 and the positioning rod 31. When positioning rod 31 is interlocked with base 32 via coarse height adjustment locking mechanism 33, positioning rod 31 is immobilized, thereby defining the height of the overall tibial extramedullary positioning device relative to the patient's leg; when the locking between the positioning rod 31 and the base 32 is released, the positioning rod 31 is allowed to move up and down, thereby coarsely adjusting the height of the entire tibial extramedullary positioning apparatus relative to the patient's leg. Preferably, the coarse height adjustment locking mechanism 33 is engaged with the positioning rod 31 in a concave-convex manner.

The coarse 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 rough height lock mechanism 33 is slidable on the base 32, and has a locked position and an unlocked position; when the height coarse adjustment locking mechanism 33 is forced to slide to the locking position, the height coarse adjustment locking mechanism 33 is locked with the positioning rod 31; when the coarse height adjustment locking mechanism 33 is forced to slide to the unlocking position, the coarse height adjustment locking mechanism 33 is unlocked from the positioning rod 31. Similarly, the force applied here may be simply applied to slide without an elastic force, or applied to slide in a pressing manner with an elastic force. And no matter what kind of locking mode is adopted, height coarse adjustment locking mechanism 33 all sets up the one side that deviates from patient's shank at locating lever 31 to produce the interference with patient's shank when avoiding operating, in order to facilitate the use. Moreover, it should be understood that the sliding locking or unlocking is realized by the structure of the slider, and the detailed description is omitted.

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

As shown in fig. 11, in the present embodiment, the length of the lower portion of the positioning rod 31 is provided with a limiting protrusion 313, the number of the limiting protrusions 313 is usually a plurality of limiting protrusions arranged in sequence, the size of the spacing distance between the 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 stopper protrusion 313 is not limited, and for example, the shape of the stopper rib 11a on the crossbar 11 may be referred to.

Referring to fig. 10, the locking piece 331 is provided with a limit recess 332 for matching with the limit protrusion 313 of the positioning rod 31. Preferably, the number of the limiting recesses 332 on the locking piece 331 is multiple, so that the multiple limiting recesses 332 are matched with the multiple limiting protrusions 313 simultaneously, and the locking is firmer.

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

As shown in fig. 12 and 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 of the base 32 is further provided with an assembling cavity 32b communicating with the axial through hole 32a, the assembling cavity 32b being used for assembling the locking block 331.

When the locking device is used, 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, the vertical height of the positioning rod 31 can be freely adjusted at the moment, and on the contrary, when the locking block 331 is released, the limiting groove 332 can be matched with the limiting protrusion 313 to achieve the purpose of locking the positioning rod 31. The means for providing the elastic force to the locking piece 331 may be any means known in the art as long as the position restricting recess 332 can be driven to engage with the position restricting protrusion 313 (rightward movement in fig. 10), for example, an elastic member may be provided between the base 32 and the rough height adjusting locking mechanism 33, or an elastic member may be provided between the positioning rod 31 and the rough height adjusting locking mechanism 33, and the rough height adjusting 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 understood that although the above lateral adjustment mechanism 10 is a sliding type locking or unlocking mechanism and the height coarse adjustment mechanism 30 is a pressing type locking or unlocking mechanism, in practice, the two fixing manners can be interchanged, but corresponding modifications in structure are required, and the structural modifications are easy to be realized by those skilled in the art and are not described in detail.

To sum up, the utility model discloses a shin bone cuts extramedulla positioner can lock fast or unblock slide, operation easy operation and convenience. In addition, through combining together rack and pinion drive mode and unsmooth spacing mode, can realize that shin bone plate regulation mode switches each other between quick adjustment and meticulous regulation, and shin bone plate position control is more accurate, and the precision of cutting the bone is higher. In addition, the pressing type locking and fixing mode of the positioning rod avoids complex rotating and locking steps, the man-machine performance is superior, and the problem of interference with the legs of a patient during operation can be effectively avoided. Generally speaking, the utility model discloses a positioner can promote doctor's operation efficiency by a wide margin, reduces a series of operation complications that patient arouses because of the operation time overlength.

It should be noted that, for a person skilled in the art, numerous modifications and additions will be possible without departing from the method of the invention, which shall also be considered as the scope of protection of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present invention, which should be construed as broadly as the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes made to the above embodiments according to the essential technology of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. The utility model provides a shin bone cuts extramedullary positioner which characterized in that, includes high fine-tuning and high coarse-tuning:

the height coarse adjustment mechanism comprises a positioning rod, a base and a height coarse adjustment locking mechanism; one end of the positioning rod is movably connected with the base; the height coarse adjustment locking mechanism is connected with the base and is 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 is in meshing transmission with the positioning rod; the mounting platform is used for being detachably and fixedly connected with the tibial osteotomy plate; the height fine-tuning locking mechanism is connected with the mounting platform and used for locking the mounting platform and the positioning rod.

2. The external tibial osteotomy positioning device of claim 1, further comprising a lateral adjustment mechanism, said 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 bone marrow external positioning device according to claim 2, wherein the transverse adjusting locking mechanism is used for being in concave-convex fit connection with the cross rod, and/or the height coarse adjusting locking mechanism is used for being in concave-convex fit connection with the positioning rod.

4. The tibial extramedullary positioning device 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 configured for a male-female fit connection with the crossbar;

5. The external tibial bone marrow resection positioning device of claim 4, wherein an elastic member is disposed between the lateral adjustment locking mechanism and the sliding base 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 external tibial osteotomy positioning device of claim 3, wherein said coarse height lock mechanism is configured to slide on said base and has a locked position and an unlocked position when said coarse height lock mechanism is configured for male-female mating engagement with said positioning rod;

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

8. The tibial extramedullary positioning device of claim 2, wherein the lateral adjustment locking mechanism comprises a movably disposed slider having at least one first stop feature, and the cross-bar having a plurality of second stop features that are male and female engaged with the first stop feature.

9. The tibia bone marrow cutting external positioning device according to claim 8, wherein the transverse adjusting mechanism further comprises a limiting pin for limiting the stroke of the sliding block, the limiting pin is fixedly arranged on the sliding seat, and a limiting hole matched with the limiting pin is formed in the sliding block.

10. The tibial bone-cutting extramedullary positioning apparatus of claim 1, wherein the positioning rod movably passes through the mounting platform, one side of the positioning rod is provided with engaging teeth, and the rotating structure comprises a gear, and the teeth of the gear are used for matching with the engaging teeth of the positioning rod.

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

12. The tibial bone-cutting extramedullary positioning device of claim 10 wherein the mounting platform has a threaded hole, the height fine-adjustment locking mechanism includes a stud that is threadedly secured to the threaded hole, and one end of the stud is configured to abut the positioning rod for locking.

13. The tibia bone marrow cutting external positioning device according to claim 1, wherein the positioning rod is movably arranged through the base, the height coarse adjustment locking mechanism comprises a movably arranged locking block, the locking block is provided with a third limiting structure, and the positioning rod is provided with a plurality of fourth limiting structures which are in concave-convex fit with the third limiting structure.

14. The tibial bone marrow external positioning device of claim 13, wherein the positioning rod is provided with engaging teeth on a side facing away from the predetermined subject, the engaging teeth and the fourth limit structure being provided on opposite sides of the positioning rod.