CN111297436A

CN111297436A - Knee joint intramedullary positioner

Info

Publication number: CN111297436A
Application number: CN202010245696.XA
Authority: CN
Inventors: 史春宝; 解凤宝; 韩川
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-06-19

Abstract

The invention belongs to the technical field of medical instruments and discloses a knee joint intramedullary positioning device. This knee joint intramedullary positioner includes hollow rotating shaft and overlaps in proper order and establish in hollow rotating shaft: the angle positioning end cover is fixedly connected to the hollow rotating shaft; a rotating handle assembly rotatably connected to the hollow rotating shaft, a first end of the rotating handle assembly being configured to be attachable to and detachable from the angular positioning cap to enable the rotating handle assembly to be rotated and positioned relative to the angular positioning cap; the locating plate, the wobbling connection of locating plate is on hollow rotating shaft, and the second tip and the locating plate slip butt of twist grip subassembly. The knee joint intramedullary positioning device can simplify the operation steps and improve the operation precision, thereby improving the success rate of the operation and making up the defects in the prior art.

Description

Knee joint intramedullary positioner

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a knee joint intramedullary positioning device.

Background

The knee joint intramedullary positioning device is an essential instrument in knee joint surface replacement surgery. The knee joint intramedullary positioning device in the prior art mainly comprises an intramedullary positioner, an angle device, a far-end osteotomy guide, a far-end osteotomy positioner and other four components which are all independent components.

When the knee joint intramedullary positioning device in the prior art is used, the knee joint intramedullary positioning device needs to be properly assembled according to the osteotomy condition of the distal end of the femur. This has resulted in the following disadvantages associated with prior art knee joint intramedullary positioning devices: 1) when the conventional knee joint intramedullary positioning device is assembled, a doctor or an assistant is required to clearly understand the bone cutting condition, and the doctor or the assistant is also required to master the structure of each component and the mutual matching relationship among the components, so that the difficulty in using the knee joint intramedullary positioning device is directly improved; 2) because temporary assembly is needed before use, close matching is difficult to ensure on the structure, so that certain errors exist inevitably when the measuring instrument is used for measuring, and the precision of the operation is reduced; 3) the prior angle gauge has single selection and can not be adjusted differently according to different patients, so that the precision required by the operation is difficult to achieve; 4) the angle gauge in the prior art is divided into left and right, so that the left and right angle gauges need to be paid special attention during installation so as to avoid the problem of osteotomy reversal caused by reverse installation.

Aiming at the defects of the prior art, a knee joint intramedullary positioning device is urgently needed by the technical personnel in the field, so that the operation steps can be simplified, the operation precision can be improved, the success rate of the operation can be improved, and the defects in the prior art can be overcome.

Disclosure of Invention

In order to solve all or part of the problems, the invention aims to provide a knee joint intramedullary positioning device, which can simplify the operation steps and improve the operation precision, thereby improving the success rate of the operation and making up for the defects in the prior art.

This knee joint intramedullary positioner includes hollow rotating shaft and overlaps in proper order and establish in hollow rotating shaft: the angle positioning end cover is fixedly connected to the hollow rotating shaft; a rotating handle assembly rotatably connected to the hollow rotating shaft, a first end of the rotating handle assembly being configured to be attachable to and detachable from the angular positioning cap to enable the rotating handle assembly to be rotated and positioned relative to the angular positioning cap; the locating plate, the wobbling connection of locating plate is on hollow rotating shaft, and the second tip and the locating plate slip butt of twist grip subassembly. Wherein the knee joint intramedullary positioning device is arranged as follows: when the twist grip subassembly rotated for the angle location end cover, the twist grip subassembly can drive the locating plate through the second tip and swing for hollow rotating shaft to change the swing angle of locating plate, when the twist grip subassembly was fixed a position for the angle location end cover, the twist grip subassembly can be through the spacing locating plate of second tip.

Further, the locating plate includes: the plate body is sleeved on the hollow rotating shaft, a strip-shaped through hole used for being sleeved on the hollow rotating shaft is formed in the plate body along the thickness direction of the plate body, and the strip-shaped through hole is located in the center of the plate body; and the fixed rotating shaft is inserted in the plate body along the height direction of the plate body, is positioned at the central position of the plate body and is fixedly connected to the hollow rotating shaft. The length of the strip-shaped through hole is larger than the outer diameter of the hollow rotating shaft, and the width of the strip-shaped through hole is equal to the outer diameter of the hollow rotating shaft.

Furthermore, two holding grooves are formed in the width direction of the plate body on the side face, opposite to the rotating handle assembly, of the plate body, the two holding grooves are located on the two sides of the hollow rotating shaft and located on the same plane with the axis of the hollow rotating shaft, and one face, abutted to the positioning plate, of the rotating handle assembly is constructed to be an inclined face. Wherein, the locating plate still including set up in two holding tanks and with the ball of inclined plane butt to make twist grip pass through the swing angle back that the inclined plane changed the locating plate, the locating plate can realize the location through inclined plane and two balls.

Further, the rotating handle assembly includes: the cylindrical shell is sleeved on the hollow rotating shaft, and an open slot is formed in the side wall of the cylindrical shell; and a positioning component connected in the open slot and capable of sliding relative to the open slot. Wherein the positioning assembly is arranged to: can move towards the cylindrical shell under the action of external force, so that the rotating handle assembly can be separated from the angle positioning end cover; can move away from the cylindrical housing when the external force is removed to enable the rotating handle assembly to be connected to the angularly oriented end cap.

Further, the positioning assembly comprises: the pressing part is connected in the open slot in a sliding manner; the elastic component is elastically abutted between the pressing part and the groove bottom of the open groove; one end of the clamping plate is connected with the pressing part, and the other end of the clamping plate is used for extending into the angle positioning end cover; the angle positioning end cover is constructed into a circular groove structure sleeved at the end part of the cylindrical shell, and a plurality of angle grooves matched with the clamping plates are formed in the inner side wall of the angle positioning end cover at equal intervals. Wherein the positioning assembly is arranged to: under the effect of external force, press the splenium and can drive the joint board and break away from the angle recess to make the handle body rotate for the angle location end cover, under the state of release external force, elastomeric element can make and press the splenium to reset, so that drive the joint integrated circuit board according to the splenium and connect in the angle recess.

Further, the periphery of the outer peripheral wall of the cylindrical shell is also provided with scale marks, and the scale marks comprise: the clamping plate is positioned at the corresponding position of the zero scale mark; and scale marks which are symmetrically increased towards two sides respectively by taking the zero scale mark as a reference; a datum line is formed on the peripheral wall of the angle positioning end cover, and angle grooves are symmetrically formed in the angle positioning end cover along the datum line. Wherein, at the initial position of the knee joint intramedullary positioning device, the zero scale mark corresponds to the reference line, and each scale mark corresponds to each angle groove one to one.

Furthermore, a blind hole with an axis parallel to the axis of the hollow rotating shaft is formed on the side surface of the cylindrical shell opposite to the angle positioning end cover, the rotating handle assembly further comprises a spherical pin partially fixed in the blind hole and a spring elastically abutted between the blind hole and the spherical pin, and a groove matched with the spherical pin is formed in the angle positioning end cover. When the spherical pin is positioned in the groove, the zero scale mark is aligned with the datum line.

Further, the knee joint intramedullary positioning device further comprises an intramedullary rod which passes through the hollow rotating shaft and is connected with the medullary cavity of the human body, and the hollow rotating shaft comprises: an annular flange formed on the outer peripheral wall of the hollow rotating shaft and used for limiting the angle to position the end cover; and the clamping part is formed at one end of the hollow rotating shaft, which is close to the annular flange, and is used for clamping the intramedullary rod, and the knee joint intramedullary positioning device also comprises a locking part which is sleeved on the hollow rotating shaft and is matched with the annular clamping part.

Furthermore, the knee joint intramedullary positioning device also comprises an operating handle detachably connected with the intramedullary rod, and the operating handle comprises a holding section and a clamping section connected with the holding section and used for detachably connecting the intramedullary rod. Wherein, the length direction of the holding section forms an included angle with the axis of the hollow rotating shaft.

Further, the knee joint intramedullary positioning device also comprises a bone cutting plate detachably connected with the positioning plate. Wherein, be formed with two spliced eyes that run through the locating plate on the direction of height of locating plate, two spliced eyes are located the both sides of hollow rotating shaft, are formed with on the osteotome board with two spliced eyes grafting complex spliced pole.

Compared with the prior art, the knee joint intramedullary positioning device provided by the embodiment of the invention has the following advantages:

1) the knee joint intramedullary positioning device provided by the embodiment of the invention omits the assembly step during osteotomy in the prior art, so that the operation time is directly and effectively shortened, and the operation steps are simplified, thereby effectively improving the operation success rate and reducing the pain of patients;

2) the knee joint intramedullary positioning device provided by the embodiment of the invention changes the swing angle of the positioning plate through the rotation of the rotating handle component, and increases the angle adjusting range of the eversion angle, so that the fixed angle adjusting degree in the prior art is upgraded to be capable of adjusting the angle according to different requirements of patients, and the precision of the operation is further effectively improved;

3) the knee joint intramedullary positioning device provided by the embodiment of the invention is operated in an integrated mode, so that the problem of low osteotomy accuracy caused by unstable assembly of four mating pieces of the femur distal osteotomy device in the prior art is effectively solved;

4) the knee joint intramedullary positioning device provided by the embodiment of the invention can effectively enlarge the adjustment range of the valgus angle by changing the matching precision of the adjacent clamping plates and the angle grooves, so that the knee joint intramedullary positioning device provided by the embodiment of the invention can be used for selecting more femur valgus angles, and meets the clinical requirements.

Drawings

FIG. 1 is a schematic structural view of an intramedullary positioning device of a knee joint according to an embodiment of the present invention;

FIG. 2 is a top view of the knee joint intramedullary positioning device shown in FIG. 1 with the operating handle and osteotomy plate not shown;

FIG. 3 is a schematic cross-sectional structural view of the knee joint intramedullary positioning device shown in FIG. 1, with the operating handle and osteotomy plate not shown;

FIG. 4 is a cross-sectional view of the positioning plate shown in FIG. 1;

FIG. 5 is a schematic structural view of the twist grip assembly shown in FIG. 1;

FIG. 6 is a cross-sectional structural schematic view of the twist handle assembly shown in FIG. 5;

FIG. 7 is a schematic view of the connection of the rotating handle assembly of FIG. 1 to the angularly positioning end cap, showing the connection of the snap plate to the angular groove;

FIG. 8 is a cross-sectional structural schematic view of the angularly oriented end cap shown in FIG. 1.

Detailed Description

For better understanding of the objects, structure and function of the present invention, a knee joint intramedullary positioning device of the present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 to 3 show the structure of a knee joint intramedullary positioning device 100 according to an embodiment of the present invention. As shown in fig. 1 to 3, the knee joint intramedullary positioning device 100 includes a hollow rotating shaft 1 and a positioning sleeve sequentially sleeved on the hollow rotating shaft 1: the angle positioning end cover 2 is fixedly connected to the hollow rotating shaft 1; a rotating handle assembly 3, the rotating handle assembly 3 is rotatably connected to the hollow rotating shaft 1, and a first end part of the rotating handle assembly 3 is configured to be connected with and separated from the angle positioning end cover 2, so that the rotating handle assembly 3 can rotate and be positioned relative to the angle positioning end cover 2; the locating plate 4, but the wobbling connection of locating plate 4 is on hollow rotating shaft 1, and the second tip of twist grip subassembly 3 and locating plate 4 slip butt. Wherein the knee intramedullary positioning device 100 is configured to: when twist grip subassembly 3 rotated for angle location end cover 2, twist grip subassembly 3 can drive locating plate 4 through the second tip and swing for hollow rotating shaft 1 to change the swing angle of locating plate 4, when twist grip subassembly 3 was fixed a position for angle location end cover 2, twist grip subassembly 3 can be through the spacing locating plate 4 of second tip.

In use, the knee joint intramedullary positioning device 100 of the present embodiment first positions an opening point, e.g., typically 8mm-10mm anterior to the cruciate ligament insertion point, and opens the femoral medullary cavity using a femoral drill. The intramedullary rod 5 is inserted into the hollow rotating shaft 1 and fixed with the hollow rotating shaft 1 so as to connect the intramedullary rod 5 with the knee joint intramedullary positioning device 100. Prior to use of the knee joint intramedullary positioning device 100, the appropriate femoral valgus angle can be determined based on a preoperative interpretation of the X-ray film. After the proper femoral valgus angle is determined, the swing angle of the positioning plate 4 of the knee joint intramedullary positioning device 100 of the embodiment of the invention is adjusted. It should be noted that the valgus angle of the femur substantially corresponds to the angle of the positioning plate 4 relative to the center line of the intramedullary rod 5, the extending direction of the intramedullary rod 5 is the anatomical axis of the femur, and the direction perpendicular to the positioning plate 4 is the mechanical axis. During adjustment, the handle assembly 3 is rotated to change the swing angle of the positioning plate 4 to the position which is the same as the angle of the eversion angle in combination with the determined eversion angle, and then the rotating handle assembly 3 is connected with the angle positioning end cover 2 to position the positioning plate 4. The intramedullary rod 5 is slowly inserted into the femoral medullary cavity until the positioning plate 4 is attached to the distal bone surface of the femur, and the fixing nail can be driven in to help the stable connection of the knee joint intramedullary positioning device 100 and the femur. Then, after the osteotomy plate is arranged on the positioning plate 4, the subsequent osteotomy work is realized.

With the above arrangement, compared with the prior art, the knee joint intramedullary positioning device 100 of the embodiment of the present invention has the following advantages:

1) the knee joint intramedullary positioning device 100 of the embodiment of the invention omits the assembly step during osteotomy in the prior art, thereby directly and effectively shortening the operation time and simplifying the operation steps, thereby effectively improving the operation success rate and reducing the pain of patients;

2) the knee joint intramedullary positioning device 100 of the embodiment of the invention changes the swing angle of the positioning plate 4 by rotating the rotary handle component 3, and increases the angle adjusting range of the valgus angle, thereby upgrading the fixed angle adjusting degree in the prior art into angle adjustment according to different requirements of patients, and further effectively improving the precision of the operation;

3) the knee joint intramedullary positioning device 100 provided by the embodiment of the invention operates in an integrated mode, so that the problem of low osteotomy accuracy caused by unstable assembly of four mating parts of the femur distal osteotomy device in the prior art is effectively solved.

It should be noted that prior to use of the knee intramedullary positioning device 100, preparation for distal femoral osteotomy is required. Which comprises the following steps: taking a picture of the X-ray film of the full-length standing position of the lower limb, wherein a straight line passing through the center of a femoral medullary cavity and the middle point of the knee joint is an anatomical axis of the femur; the line passing through the center of the femoral head and the midpoint of the knee joint is the mechanical axis. The included angle between the two axes is the eversion angle, which is the required adjustment angle of the positioning plate 4. The size of the bilateral knee joint valgus angle must be measured before operation. The magnitude of the valgus angle is typically between 3 ° and 8 °. Therefore, for a particular case, the most appropriate valgus osteotomy angle is determined prior to performing the distal femoral osteotomy.

In a preferred embodiment shown in fig. 4, the positioning plate 4 may include: a plate body 41 sleeved on the hollow rotating shaft 1, wherein a strip-shaped through hole 42 sleeved on the hollow rotating shaft 1 is formed in the plate body 41 along the thickness direction of the plate body, and the strip-shaped through hole 42 is positioned in the center of the plate body 41; and a fixed rotating shaft 43 (shown in fig. 2) inserted into the plate body 41 along the height direction of the plate body 41, wherein the fixed rotating shaft 43 is located at the center of the plate body 41, and the fixed rotating shaft 43 is fixedly connected to the hollow rotating shaft 1. The length of the strip-shaped through hole 42 is greater than the outer diameter of the hollow rotating shaft 1, and the width of the strip-shaped through hole 42 is equal to the outer diameter of the hollow rotating shaft 1.

Through the arrangement, the swing effect of the positioning plate 4 relative to the hollow rotating shaft 1 can be effectively realized. Specifically, the length of bar through-hole 42 is greater than the external diameter of hollow rotating shaft 1, and the width of bar through-hole 42 equals the external diameter of hollow rotating shaft 1 for plate body 41 cup joints back on hollow rotating shaft 1, and it can move on the length direction of bar through-hole 42, and can be through the surplus of bar through-hole 42 and the external diameter of hollow rotating shaft 1, make plate body 41 can swing for hollow rotating shaft 1. In this embodiment, after the fixed rotating shaft 43 inserted into the plate body 41 along the height direction of the plate body 41 is connected to the hollow rotating shaft 1, the movement of the plate body 41 along the length direction of the strip-shaped through hole 42 is limited, so that the plate body 41 can only realize the swinging effect.

It should be noted that, since the rod 5 needs to be inserted into the hollow rotating shaft 1, the fixed rotating shafts 43 in this embodiment can be understood as two fixed rotating shafts 43 symmetrically arranged in the height direction of the plate body 41 to avoid obstructing the insertion of the rod 5.

In a preferred embodiment, the side of the plate body 41 opposite to the rotating handle assembly 3 may be formed with two receiving grooves (not shown) along the width direction of the plate body 41, the two receiving grooves may be located on both sides of the hollow rotating shaft 1 and on the same plane as the axis of the hollow rotating shaft 1, and one surface of the rotating handle assembly 3 abutting against the positioning plate 4 may be configured as an inclined surface 31 (as shown in fig. 3). Wherein, the positioning plate 4 may further include a ball 412 disposed in the two receiving grooves and abutting against the inclined surface 31, so that the positioning plate 4 can be positioned by the inclined surface 31 and the two balls 412 after the swing angle of the positioning plate 4 is changed by the rotating handle via the inclined surface 31. In the use of the present embodiment, the surface of the rotating handle assembly 3 abutting against the positioning plate 4 is configured as the inclined surface 31, so that the surface of the rotating handle assembly 3 abutting against the positioning plate 4 forms a certain inclined included angle, and the direction of the inclined included angle can be changed in the rotating process of the rotating handle assembly 3. For example, when the knee joint intramedullary positioning device 100 of the embodiment of the present invention is located at the initial position, the inclined angle of the inclined surface 31 can be located at the position of the fixed rotating shaft 43 of the positioning plate 4, so that the positioning plate 4 is located at the position perpendicular to the intramedullary rod 5 due to the limit of the fixed rotating shaft 43 when the inclined surface 31 abuts against the positioning plate 4; along with the rotation of the rotating handle assembly 3, the position of the inclined angle of the inclined surface 31 is gradually changed, so that the position of the inclined surface 31 acting on the positioning plate 4 is gradually changed, and the swinging angle of the positioning plate 4 can be changed under the combined action of the inclined angle and the fixed rotating shaft 43. In this embodiment, the positioning plate 4 may further include balls 412 disposed in the two accommodating grooves and abutted to the inclined surface 31, so that after the positioning plate 4 changes the angle, the positioning plate 4 is fixed by the abutting of the inclined surface 31 to the positioning plate 4 and the two balls 412. Through the arrangement, the angle adjusting range of the eversion angle can be adjusted under the combined action of the abutting of the inclined surface 31 and the positioning plate 4 and the two balls 412, so that the precision of the operation is effectively improved.

In a preferred embodiment shown in fig. 5 and 6, the rotary handle assembly 3 may comprise: a cylindrical shell 32 sleeved on the hollow rotating shaft 1, wherein an open slot 321 is formed on the side wall of the cylindrical shell 32; and a positioning assembly 33 connected in the opening groove 321 and capable of sliding with respect to the opening groove 321. Wherein the positioning assembly 33 is arranged to: is movable towards the cylindrical housing 32 under the action of external forces to enable the rotary handle assembly 3 to be disengaged from the angularly oriented end cap 2; can be moved away from the cylindrical housing 32 when the external force is removed to allow the rotating handle assembly 3 to be coupled to the angularly oriented end cap 2. Through the arrangement, the convenience of adjusting the eversion angle can be effectively improved, so that the operation time can be effectively shortened, the operation steps are simplified, the operation success rate can be effectively improved, and the pain of a patient is reduced.

In a preferred embodiment shown in fig. 5, the positioning assembly 33 may comprise: a pressing portion 331 slidably coupled in the opening groove 321; an elastic member 332 elastically abutting between the pressing portion 331 and the groove bottom of the open groove 321; and a clamping plate 333 (shown in fig. 7) having one end connected to the pressing portion 331 and the other end extending into the angle positioning end cap 2; the angle positioning end cap 2 is configured as a circular groove structure sleeved on the end of the cylindrical shell 32, and a plurality of angle grooves 21 (shown in fig. 7) for matching with the clamping plates 333 are formed on the inner side wall of the angle positioning end cap 2 at equal intervals. Wherein the positioning assembly 33 is arranged to: under the effect of external force, pressing portion 331 can drive joint plate 333 to break away from angle recess 21 to make the handle body rotate for angle location end cover 2, under the state of release external force, elastic component 332 can make pressing portion 331 reset, so that pressing portion 331 drives joint plate 333 joint in angle recess 21. Wherein each of the angular grooves 21 is calculated to represent an angle. Therefore, when the angle needs to be adjusted to the required angle, the clamping plate 333 is only needed to be matched with the angle groove 21 corresponding to the angle for use, so that the convenience of angle adjustment of the knee joint intramedullary positioning device 100 provided by the embodiment of the invention can be effectively improved, the operation time can be further shortened, the operation steps can be simplified, the operation success rate can be effectively improved, and the pain of a patient can be reduced.

Furthermore, the accuracy of the snap fit of the snap plate 333 to the angular groove 21 may also be specifically defined depending on the range of the specific eversion angle and the accuracy of the adjustment. For example, the adjustment range of the connected angle groove 21 may be set to 1 °, or the adjustment range of the connected angle groove 21 may be set to 0.5 °, and only the matching accuracy between the adjacent catch plate 333 and the angle groove 21 needs to be changed. Therefore, the adjustment range of the valgus angle can be effectively expanded, so that the knee joint intramedullary positioning device 100 provided by the embodiment of the invention can be used for selecting more femur valgus angles, and the clinical requirements are met.

Preferably, as shown in fig. 5, the pressing portion 331 may be fixedly connected with the cylindrical housing 32 by a positioning pin. The pressing portion 331 may be configured as a groove structure that is engaged with the open groove 321, and a strip-shaped through hole 42 for passing the positioning pin is formed on a sidewall of the groove structure. With this arrangement, the strip-shaped through hole 42 enables the pressing portion 331 to move relative to the positioning pin in the length direction thereof, thereby achieving connection of the pressing portion 331 with the cylindrical shell 32.

In a preferred embodiment, the opening groove 321 may be configured as a first groove (not shown) for receiving the pressing portion 331, and a second groove (not shown) communicating the first groove with the first end portion, the second groove being configured for mounting and receiving the chucking plate 333.

In a preferred embodiment shown in fig. 5, the outer circumferential wall of the cylindrical housing 32 may further be formed with scale marks 322 in a circumferential direction, and the scale marks 322 may include: the zero scale line 3221 is located at a corresponding position of the zero scale line 3221 of the clamping plate 333; and scale marks 3222 symmetrically increasing to both sides with the zero scale mark 3221 as a reference; the outer peripheral wall of the angular positioning end cap 2 may be formed with a reference line 22, and the angular grooves 21 are symmetrically formed in the angular positioning end cap 2 along the reference line 22. In the initial position of the knee joint intramedullary positioning device 100, the zero scale mark 3221 corresponds to the reference line 22, and each scale mark 3222 corresponds to each angular groove 21.

With the above arrangement, two sides of the zero graduation mark 3221 can be set to adjust the valgus angles of the left and right limbs of the human body, so that the knee joint intramedullary positioning device 100 of the embodiment of the invention can adjust the left and right limbs of the human body without replacing parts. In use, the zero-scale line 3221 corresponds to the reference line 22 at an initial position of the knee joint intramedullary positioning device 100, when the positioning plate 4 is in a position perpendicular to the intramedullary rod 5 (i.e., the initial position). By rotating the cylindrical housing 32 along one side of the zero-graduation mark 3221, the reference line 22 on the outer peripheral wall of the angle positioning end cap 2 is aligned with one side of the zero-graduation mark 3221, so that the inclined surface 31 also slides only on one side of the fixed rotating shaft 43 of the positioning plate 4 during one-sided adjustment, and thus only the one-sided swing angle of the positioning plate 4 is changed, which can adapt to the adjustment of the eversion angle of one-sided limb of the human body. Through the arrangement, the knee joint intramedullary positioning device 100 provided by the embodiment of the invention can parameterize the adjustment of the valgus angle by arranging the scale mark 3222, so that an operator can adjust to a required angle more quickly.

Preferably, as shown in fig. 6, a blind hole 323 having an axis parallel to the axis of the hollow rotating shaft 1 may be formed on the side of the cylindrical housing 32 opposite to the angularly positioning end cap 2, the rotating handle assembly 3 may further include a ball-type pin 34 partially fixed in the blind hole 323 and a spring 324 elastically abutting between the blind hole 323 and the ball-type pin 34, and a groove 23 (as shown in fig. 8) for cooperating with the ball-type pin 34 may be formed in the angularly positioning end cap 2. Wherein the zero graduation mark 3221 is aligned with the reference line 22 when the ball-type pin 34 is positioned in the groove 23. Through the arrangement, the accuracy of the alignment of the zero scale mark 3221 and the reference line 22 can be effectively improved through the matching of the spherical pin 34 and the groove 23, so that the eversion angle adjustment accuracy of the knee joint intramedullary positioning device 100 provided by the embodiment of the invention is improved.

Returning to fig. 3, preferably, the knee joint intramedullary positioning device 100 may further comprise an intramedullary rod 5 passing through the hollow shaft 1 for connecting to the medullary cavity of the human body, and the hollow shaft 1 may comprise: an annular flange 11 formed on the outer peripheral wall of the hollow rotating shaft 1 for limiting the angular positioning of the end cap 2; and a clamping part 12 formed at one end of the hollow rotating shaft 1 near the annular flange 11 for clamping the intramedullary rod 5, and the knee joint intramedullary positioning device 100 can further comprise a locking part 13 which is sleeved on the hollow rotating shaft 1 and is matched with the annular clamping part 12. Wherein the locking element 13 is configured to fit tightly with the clamping portion 12 and to reduce the size of the opening of the clamping portion 12, thereby clamping and securing the intramedullary rod 5. Through the arrangement, the intramedullary rod 5 can be fixed only by sleeving the locking piece 13 on the hollow rotating shaft 1 and matching with the annular clamping part 12, so that the fixation is more convenient.

Returning to fig. 1, preferably, the knee joint intramedullary positioning device 100 can further comprise an operating handle 6 detachably connected to the intramedullary rod 5, and the operating handle 6 can comprise a gripping section 62 and a clamping section 61 connected to the gripping section 62 for detachably connecting the intramedullary rod 5. Wherein, the length direction of the holding section 62 forms an included angle with the axis of the hollow rotating shaft 1. Through the arrangement, the holding direction of an operator can form an included angle with the central line of the intramedullary rod 5, so that the intramedullary rod more conforms to human mechanics, and the comfort level of the operator is improved. Of course, the knee joint intramedullary positioning device 100 of the embodiment of the present invention may also use the operation handle 6 in which the length direction of the holding section 62 is parallel to the axis of the hollow rotating shaft 1, so as to be suitable for use in more clinical environments.

Preferably, as shown in connection with FIG. 1, the knee joint intramedullary positioning device 100 may further comprise a osteotomy plate 7 removably attached to the positioning plate 4. Two inserting holes 44 penetrating through the positioning plate 4 can be formed in the height direction of the positioning plate 4, the two inserting holes 44 are located at two sides of the hollow rotating shaft 1, and an inserting rod (not shown in the figure) in inserting fit with the two inserting holes 44 can be formed on the osteotomy plate 7. Through the arrangement, the osteotomy plate 7 detachably connected to the positioning plate 4 is simple to operate, so that after the angle of the positioning plate 4 is adjusted, subsequent osteotomy work can be carried out by installing the positioning angle of the positioning plate 4 only by directly installing the osteotomy plate 7, and the operation difficulty of the knee joint intramedullary positioning device 100 provided by the embodiment of the invention is effectively reduced.

In a preferred embodiment, the angular positioning end cap 2, the rotating handle component 3 and the locking element 13 of the knee joint intramedullary positioning device 100 of the embodiment of the invention are all made of plastic materials, so that the weight of the knee joint intramedullary positioning device 100 is effectively reduced, and the use of the knee joint intramedullary positioning device is further facilitated.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

In the description of the present application, it is to be understood that the terms "center", "height", "width", "thickness", "left", "right", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second", etc. 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. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a knee joint is positioner in marrow which characterized in that includes hollow rotating shaft and overlaps in proper order and establish hollow rotating shaft is last:

the angle positioning end cover is fixedly connected to the hollow rotating shaft;

a twist-grip assembly rotatably connected to the hollow shaft, a first end of the twist-grip assembly being configured to be attachable and detachable from the angularly positioned end cap to enable rotation and positioning of the twist-grip assembly relative to the angularly positioned end cap;

the positioning plate is connected to the hollow rotating shaft in a swinging mode, and the second end of the rotating handle assembly is in sliding butt joint with the positioning plate;

wherein the knee joint intramedullary positioning device is configured to: when the rotating handle assembly rotates relative to the angle positioning end cover, the rotating handle assembly can drive the positioning plate to swing relative to the hollow rotating shaft through the second end part so as to change the swing angle of the positioning plate, and when the rotating handle assembly is positioned relative to the angle positioning end cover, the rotating handle assembly can limit the positioning plate through the second end part.

2. The knee joint intramedullary positioning device of claim 1, wherein the positioning plate comprises:

the plate body is sleeved on the hollow rotating shaft, a strip-shaped through hole used for being sleeved on the hollow rotating shaft is formed in the plate body along the thickness direction of the plate body, and the strip-shaped through hole is located in the center of the plate body; and

the fixed rotating shaft is inserted into the plate body along the height direction of the plate body, is positioned at the center of the plate body and is fixedly connected to the hollow rotating shaft;

the length of the strip-shaped through hole is larger than the outer diameter of the hollow rotating shaft, and the width of the strip-shaped through hole is equal to the outer diameter of the hollow rotating shaft.

3. The knee joint intramedullary positioning device according to claim 2, wherein two receiving grooves are formed in a width direction of the plate body on a side surface of the plate body opposite to the rotating handle assembly, the two receiving grooves are located on both sides of the hollow rotating shaft and on a same plane as an axis of the hollow rotating shaft, and a surface of the rotating handle assembly abutting against the positioning plate is configured as an inclined surface, wherein the positioning plate further includes balls disposed in the two receiving grooves and abutting against the inclined surface, so that the positioning plate can be positioned by the inclined surface and the two balls after the rotating handle changes a swing angle of the positioning plate by the inclined surface.

4. The knee joint intramedullary positioning device of any one of claims 1 to 3, wherein the rotating handle assembly comprises: the cylindrical shell is sleeved on the hollow rotating shaft, and an open slot is formed in the side wall of the cylindrical shell; and a positioning assembly connected in the open slot and capable of sliding relative to the open slot, wherein the positioning assembly is configured to: movable toward the cylindrical housing under an external force to enable disengagement of the rotating handle assembly from the angularly positioned end cap; is movable away from the cylindrical housing upon removal of the external force to enable the rotating handle assembly to be coupled to the angularly oriented end cap.

5. The knee joint intramedullary positioning device of claim 4, wherein the positioning assembly comprises: the pressing part is connected in the open slot in a sliding manner; the elastic component is elastically abutted between the pressing part and the groove bottom of the open groove; one end of the clamping plate is connected with the pressing part, and the other end of the clamping plate is used for extending into the angle positioning end cover; the angle location end cover structure is established for the cover the circular groove structure of the tip of cylindricality casing, the equidistant a plurality of angle recesses that are used for with joint board complex on the inside wall of angle location end cover, wherein, locating component sets up: under the effect of external force, press the splenium to drive the joint board breaks away from the angle recess, so that the handle body can for the angle location end cover rotates, under the state of release external force, elastomeric element can make press the splenium to reset, so that press the splenium to drive the joint integrated circuit board connect in the angle recess.

6. The knee joint intramedullary positioning device according to claim 5, wherein scale marks are further formed in the circumferential direction of the outer circumferential wall of the cylindrical housing, the scale marks including: the clamping plate is positioned at the corresponding position of the zero scale mark; and the scale marks are symmetrically increased towards two sides by taking the zero scale mark as a reference; the outer peripheral wall of the angle positioning end cover is provided with a reference line, the angle grooves are symmetrically formed in the angle positioning end cover along the reference line, the zero scale mark corresponds to the reference line at the initial position of the knee joint intramedullary positioning device, and each scale mark corresponds to each angle groove one to one.

7. The knee joint intramedullary positioning device according to claim 6, wherein a blind hole having an axis parallel to the axis of the hollow rotating shaft is formed on a side surface of the cylindrical housing opposite to the angular positioning end cap, the rotating handle assembly further comprises a ball-shaped pin partially fixed in the blind hole and a spring elastically abutted between the blind hole and the ball-shaped pin, a groove matched with the ball-shaped pin is formed in the angular positioning end cap, and when the ball-shaped pin is located in the groove, the zero scale line is aligned with the reference line.

8. The knee intramedullary positioning device of any one of claims 1 to 3, further comprising an intramedullary rod passing through the hollow shaft for connection to an intramedullary canal of a human body, the hollow shaft comprising: an annular flange formed on the outer peripheral wall of the hollow rotating shaft and used for limiting the angle positioning end cover; and the clamping part is formed at one end of the hollow rotating shaft, which is close to the annular flange, and is used for clamping the intramedullary rod, and the locking part matched with the annular clamping part is sleeved on the hollow rotating shaft.

9. The knee joint intramedullary positioning device of claim 8, further comprising an operating handle detachably connected to the intramedullary rod, the operating handle comprising a gripping section and a clamping section connected to the gripping section for detachably connecting the intramedullary rod, wherein a length direction of the gripping section forms an angle with an axis of the hollow rotating shaft.

10. The knee joint intramedullary positioning device according to any one of claims 1 to 3, further comprising a bone truncating plate detachably connected to the positioning plate, wherein two insertion holes penetrating through the positioning plate are formed in the height direction of the positioning plate and located on both sides of the hollow rotating shaft, and insertion rods which are in insertion fit with the two insertion holes are formed on the bone truncating plate.