CN217960230U - Single condyle grinding and bone cutting system - Google Patents

Abstract

The utility model relates to the field of medical instrument design, especially, relate to a single condyle grinds osteotomy system, it includes the mill inner core, the mill intermediate level, mill shell and grinding are tied, mill shell outer wall is the toper structure, the mill intermediate level is installed in the mill shell, the mill inner core front portion inserts in the mill intermediate level, the mill inner core, the rigid coupling between mill intermediate level and the mill shell, the mill inner core is established and is tied the patchhole, it ties in the patchhole to insert the grinding to tie, the grinding is tied and is had multiple specification, the grinding of every kind of specification is tied and is equipped with many equidistant datum lines, and the grinding is tied and is reduced a datum line for every ascending specification, the distance between both ends to nearest datum line is tied to the grinding of multiple specification is unchangeable. The utility model provides a system's activity unicondylar false body operation incision is little, and thighbone cuts the bone volume for a short time, grinds the accuracy and avoids cutting the bone many times.

Description

Single condyle grinding and bone cutting system

Technical Field

The utility model relates to the field of medical instrument design, especially, relate to a single condyle grinds osteotomy system.

Background

The mobile unicondylar replacement procedure is also called a partial knee replacement procedure, which simply replaces worn femoral and tibial articular surfaces in the medial portion of the knee. The biggest advantages of the unicondylar replacement are minimal trauma, small incision which is only 8-10 cm, no need of dislocating patella, less tissue stripping and less osteotomy amount.

When the movable unicondylar replacement is used for distal femur osteotomy, firstly, a grinding bolt is inserted through a drill hole, a grinder is inserted into the grinding bolt, the grinder rotates and grinds around the grinding bolt to perform distal femur osteotomy, and the grinding and shaping are performed to enable the grinding and shaping to be matched with the inner surface of a femoral prosthesis.

The grinding bolt of the existing grinder has eight models from 0 to 7, and the model size is controlled by the thickness of a neck collar. From No. 0 to No. 7, the thickness of the grinding bolt corresponding to the middle neck collar decreases according to the model with the step difference of 1mm, so that the bone cutting amount of the grinder on the femoral condyle is correspondingly increased. The primary grind is typically performed using the thickest neck-collar # 0 grind pin to shape the femoral surface, establishing a zero point of grind for subsequent grind measurement calculations. However, due to the existence of the grinding bolt neck collar and the grinding device groove, the neck projection appears after the grinding of the distal end of the femur, and a special tool is needed to remove the neck projection. In the process of removing the collar projection, the edge of the middle hole is easy to be damaged to a certain extent, and when the biological femoral condyle prosthesis is implanted, the initial stability of the implanted biological femoral condyle prosthesis is influenced to a certain extent, so that the service life of the biological femoral condyle prosthesis is shortened. In addition, when the principle of the set of grinding osteotomy system is not sufficiently understood by a doctor during operation, when three grinding osteotomies are needed to balance flexion and extension gaps, multiple osteotomies are easy to occur, and gap balance is difficult to realize during operation.

In addition, the appearance of the grinder on the market is mostly cylindrical, the size is large, the operation of surgical instruments can be conveniently performed only by limiting a single-condyle surgical incision to be minimally invasive and at least requiring 8cm, and the requirement of quick recovery after the operation of a patient is influenced. Larger surgical incisions also have some impact on the aesthetic appeal of young patients after surgery. In addition, during the primary grinding, the grinding reference established by the grinding bolt and the grinder is not accurate, so that the bending and stretching balance can be realized only by grinding for many times in the operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that it is little to provide activity unicondylar false body operation incision, and thighbone cuts the bone volume little, grinds the accurate unicondylar that just avoids cutting the bone many times and grinds the system of cutting the bone.

The utility model discloses a realize through following technical scheme:

the utility model provides a bone system is cut in single condyle grinding, its includes mill inner core, mill intermediate level, mill shell and grinding bolt, mill shell outer wall is the toper structure, the mill intermediate level is installed in the mill shell, mill inner core front portion inserts in the mill intermediate level, and fixed connection between mill inner core, mill intermediate level and the mill shell, the mill inner core is equipped with grinding bolt patchhole, the grinding bolt inserts in grinding bolt patchhole, and the grinding bolt has multiple specification, is equipped with many equidistant datum lines on the grinding bolt of every specification, and the grinding bolt is every to rise a specification and reduces a datum line, and the distance between its both ends of grinding bolt of multiple specification to nearest datum line is unchangeable.

Preferably, the specifications of the grinding bolt comprise five types, namely 0#, 1#, 2#, 3#, and 4#, wherein the 0# grinding bolt is a grinding bolt for establishing a grinding reference, and the 0# grinding bolt has five equidistant reference lines.

Furthermore, the grinding bolts of the same specification have different colors of each datum line and the distance between adjacent datum lines is 1mm, and the grinding bolts of different specifications have the same color of the corresponding datum line.

Optimally, the length m from the reference line at the rightmost end of the grinding bolt with various specifications to the left end surface is 25-35 mm, and the total length n of the grinding bolt is 50-60 mm.

Furthermore, a plurality of cutting edges are fixedly arranged at the front end of the middle layer of the grinder along the circumferential direction, the cutting edges of the cutting edges form a sphere, a plurality of grinding edges are fixedly arranged at the front end of the inner core of the grinder, and the cutting edges of the grinding edges form a sphere and are on the same spherical surface with the cutting edges of the cutting edges.

Preferably, the distance t between the reference line of the grinding bolt at the rearmost end and the rightmost end of the spherical surface where the grinding edge and the cutting edge are located is 2-3mm.

Optimally, the maximum diameter D of the shell of the grinder is 25-35 mm, the length L from the front end of the cutting edge of the grinder to the rear end of the shell of the grinder is 25-40 mm, the sphere diameter SR1 of the cutting edge is 16-24 mm, the grinder has a plurality of different specifications, and each specification has the same length L, different shell diameters D and different cutting edge sphere diameters SR1.

Furthermore, a limiting bulge is fixedly arranged at the rear end of the grinding bolt insertion hole.

Furthermore, the middle part of the inner core of the grinder is provided with an observation window.

Further, an electric drill interface is arranged at the rear end of the inner core of the grinder.

The utility model has the advantages that:

1. the outer wall of the grinder shell is of a conical structure, so that the end part of the grinder can be embedded into the skin during operation, the structure below the middle part is exposed, and small incision minimally invasive operation is realized.

2. The front end in mill intermediate level is fixed along circumference and is equipped with a plurality of cutting edges, and the edge of a plurality of cutting edges forms spherical, mill inner core front end is fixed and is equipped with a plurality of grinding sword, the edge of a plurality of grinding sword forms spherical and on same sphere with the blade of cutting edge, the sphere diameter of cutting edge keeps unanimous with thighbone condyle prosthesis inner chamber sphere diameter size, the edge of grinding sword forms spherical and can realize the mill with the blade of cutting edge on same sphere after the thighbone distal end has been ground, realize prosthesis and bone face complete matching, avoid prosthesis and bone face to obey not firmly, lead to the inaccurate problem of the balanced of stretching of flexing in the art.

3. The distance between the rearmost end of the spherical surface where the grinding edge and the cutting edge are located and the grinding bolt datum plane is 2-3mm, so that a grinding datum of the knee joint in a normal physiological state is established, the grinder can accurately grind thighbones, flexion and extension balance is realized through minimum thighbone grinding amount, the problem of postoperative fracture caused by excessive bone grinding amount in an operation is avoided, and meanwhile, the technical problem that flexion and extension gaps are difficult to accurately balance in the operation can be avoided.

4. The grinding bolts with different specifications are respectively provided with grinding datum lines with different numbers and positions, a grinding bolt neck collar is removed, the operation in the operation can be greatly simplified, the grinding osteotomy principle is simple and reliable, and the multi-osteotomy risk caused by misoperation in the operation can be avoided.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

FIG. 2 is a schematic illustration of the present invention;

FIG. 3 is a schematic view of the three-dimensional structure of the present invention;

FIG. 4 is a schematic view of the structure of the inner core of the grinder;

FIG. 5 is a schematic view of the structure of the intermediate layer of the grinder;

FIG. 6 is a schematic view of the structure of the housing of the grinder;

FIGS. 7-11 are schematic views of 0# -4# polishing plugs, respectively;

in the figure, 1, a grinding bolt, 2, a datum line, 3, an inner core of a grinder, 4, a limiting bulge, 5, a shell of the grinder, 6, an intermediate layer of the grinder, 7, a grinding edge, 8, a cutting edge, 9, an electric drill interface, 10, a step, 11, an observation window and 12 are arranged in a mounting hole.

Detailed Description

The utility model provides a bone system is cut in single condyle grinding which includes mill inner core 3, mill intermediate level 6, mill shell 5 and grinding bolt 1, mill shell outer wall is the toper structure, can guarantee that the embedding of mill shell front end portion is subcutaneous during the operation in the art, and the following structure of middle part exposes, realizes the operation of little incision wicresoft. Clinical verification shows that the minimally invasive grinder can reduce the conventional incision from 8-10 cm to 4-6 cm, greatly reduces the surgical incision, and provides convenience for the rapid recovery of patients and the requirement of the patients on attractiveness. The mill intermediate level is installed in the mill shell, specifically can establish step 10 at mill shell inner wall, and mill intermediate level cross-section design is Z shape structure, makes the cooperation that can be fine between shell and the intermediate level, is convenient for install the location, and prevents to take place the dislocation at the cutting grinding in-process.

The grinder inner core front portion is inserted into the grinder middle layer, the grinder inner core, the grinder middle layer and the grinder shell are fixedly connected, the mounting holes 12 can be respectively formed in corresponding positions of the grinder inner core, the grinder middle layer and the grinder shell, the grinder inner core, the grinder middle layer and the grinder shell are fixed together through screws (not shown) in the mounting holes, and assembly is convenient.

The grinder inner core is provided with a grinding bolt insertion hole, the grinding bolt is inserted into the grinding bolt insertion hole, the grinding bolt has multiple specifications, a plurality of equidistant datum lines 2 are arranged on the grinding bolt of each specification, and one datum line is reduced when the grinding bolt rises for each specification, the distance from the two ends of the grinding bolt of each specification to the nearest datum line is unchanged, namely the distance from the leftmost end to the reference line of the leftmost end of the grinding bolt of each specification is the same, and the distance from the rightmost end to the reference line of the rightmost end is the same.

During grinding, a reference line (first reference line) at the rightmost end of one grinding bolt (0 # grinding bolt) with the largest reference line is used as a reference, the grinding bolt is inserted after bone drilling, the first reference line of the grinding bolt is level with a bone surface, so that the grinding bolt is positioned, then a grinder is inserted, the grinder rotates around the grinding bolt, and the distal femur osteotomy is carried out by pushing the grinder forwards by a doctor. When the limit bulge touches the rear end of the grinding bolt, grinding is stopped, and the establishment of the primary grinding reference is completed. The unicondylar prosthesis is then subjected to flexion-extension balance tests, such as: the buckling gap is 3mm, the straightening gap is 2mm, the difference value of the grinding amount of the grinding bolts of adjacent specifications is equal to the distance between the reference lines, if the distance between the reference lines is 1mm, if the buckling gap is equal to the straightening gap, the gap balance after the prosthesis is implanted is completed, the 1# grinding bolt (which is different from the 0# grinding bolt by one reference line) can be selected for grinding, and if the buckling gap is 4mm and the straightening gap is 2mm, one specification (the 1# grinding bolt) is directly skipped over, and the 2# grinding bolt is directly selected for grinding. During grinding, the grinding bolt is inserted into the hole, the reference line at the rightmost end of the grinding bolt is parallel to the bone surface to complete the positioning of the grinding bolt, then the grinder is inserted to rotate around the grinding bolt, the grinder is pushed forward by a doctor to cut and grind to cut the distal femur, and when the limiting protrusion touches the rear end of the grinding bolt, the grinding is stopped.

The design replaces the grinding bolt neck collar with reference lines of different quantities, so that the neck collar protrusion can not appear after the distal femur is ground, the neck collar protrusion does not need to be removed by a special tool, the operation is simplified, and the bone cutting times are reduced. And because the distance from the leftmost end to the leftmost end datum line of the grinding bolts with different specifications is the same, and the distance from the rightmost end to the rightmost end datum line is the same, after the establishment of the primary grinding datum is completed by using the 0# grinding bolt, the grinding bolt with any specification can be directly determined and selected according to the bending and stretching balance test result of the unicondylar prosthesis, namely, the difference between the buckling gap and the straightening gap is determined, so that the osteotomy is directly completed, and the buckling gap can be ensured to be equal to the straightening gap, so that the gap balance after the prosthesis is implanted is ensured, the intraoperative operation is greatly simplified, and the risk of multiple osteotomy is avoided.

Preferably, the specifications of the grinding bolt include five types, namely 0#, 1#, 2#, 3#, and 4#, wherein the 0# grinding bolt is a grinding bolt for establishing a grinding reference, and the 0# grinding bolt has five equidistant reference lines. The datum line of the No. 0 grinding bolt is a first grinding datum line, a second grinding datum line, a third grinding datum line, a fourth grinding datum line and a fifth grinding datum line from right to left in sequence, the datum line of the No. 1 grinding bolt is a second grinding datum line, a third grinding datum line, a fourth grinding datum line and a fifth grinding datum line from right to left in sequence, the datum line of the No. 2 grinding bolt is a third grinding datum line, a fourth grinding datum line and a fifth grinding datum line from right to left in sequence, the datum line of the No. 3 grinding bolt is a fourth grinding datum line and a fifth grinding datum line from right to left in sequence, and the No. 4 grinding bolt is provided with one grinding datum line, namely the fifth grinding datum line.

Furthermore, the color of each datum line of the grinding bolt with the same specification is different, the distance between adjacent datum lines is 1mm, the color of the corresponding datum lines of the grinding bolts with different specifications is the same, operation is convenient, and errors in positioning of the grinding bolts are prevented.

Optimally, the length m from the reference line at the rightmost end of the grinding bolt with various specifications to the left end surface is 25-35 mm, and the total length n of the grinding bolt is 50-60 mm.

Furthermore, a plurality of cutting edges 8 are fixedly arranged at the front end of the middle layer of the grinder along the circumferential direction, the cutting edges form a spherical shape, a plurality of grinding edges 7 are fixedly arranged at the front end of the inner core of the grinder, and the cutting edges of the grinding edges form a spherical shape and are on the same spherical surface with the cutting edges of the cutting edges. The number of the grinding blades can be three and evenly distributed at intervals of 120 degrees, and can also be a plurality of grinding blades evenly distributed along the circumferential direction. The spherical diameter of the cutting edge keeps consistent with the spherical diameter of the inner cavity of the femoral condyle prosthesis, and after the cutting edge cuts and grinds the distal end of the femur, the prosthesis can be completely matched with the bone surface, so that the problem that the prosthesis is not firmly attached to the bone surface, and the flexion-extension balance is inaccurate in the operation is solved.

Optimally, the distance t between the grinding bolt datum line at the rearmost end and the rightmost end of the spherical surface where the grinding edge and the cutting edge are located is 2-3mm. The grinding benchmark of the knee joint in the normal physiological state is conveniently established, the grinder can realize accurate grinding of the thighbone, flexion and extension balance is realized through the minimum grinding amount of the thighbone, the problem of postoperative fracture caused by excessive grinding bone amount in the operation is avoided, and meanwhile the technical problem that flexion and extension gaps are difficult to accurately balance in the operation can be avoided.

Optimally, the maximum diameter D of the shell of the grinder is 25-35 mm, the length L from the front end of the cutting edge of the grinder to the rear end of the shell of the grinder is 25-40 mm, the sphere diameter SR1 of the cutting edge is 16-24 mm, the grinder has a plurality of different specifications, and each specification has the same length L, different shell diameters D and different cutting edge sphere diameters SR1. The grinder with proper specification can be selected to operate according to the requirement.

Furthermore, a limit bulge 4 is fixedly arranged at the rear end of the grinding bolt insertion hole. When the grinding operation is carried out, the operation is stopped after the limiting bulge touches the grinding bolt, so that excessive cutting and grinding are prevented.

Furthermore, the middle part of the inner core of the grinder is provided with an observation window 11. Can be through the distance that spacing arch and grinding bolt tip were observed to observation window directness, the convenient control operation dynamics prevents excessive cutting and grinds.

Further, an electric drill interface 9 is arranged at the rear end of the inner core of the grinder. The grinder inner core is conveniently connected with the electric drill to drive the grinder to rotate.

To sum up, the utility model discloses a single condyle that protects grinds osteotomy system, activity single condyle false body operation incision is little, and thighbone osteotomy volume is little, grinds the accuracy and avoids many times to cut the bone.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a bone system is cut in single condyle grinding, its characterized in that, includes mill inner core, mill intermediate level, mill shell and grinding bolt, mill shell outer wall is the toper structure, the mill intermediate level is installed in the mill shell, mill inner core front portion inserts in the mill intermediate level, and fixed connection between mill inner core, mill intermediate level and the mill shell, the mill inner core is equipped with the grinding bolt patchhole, the grinding bolt inserts in the grinding bolt patchhole, and the grinding bolt has multiple specification, is equipped with many equidistant datum lines on the grinding bolt of every specification, and the grinding bolt reduces a datum line for every ascending specification, and the distance between its both ends of the grinding bolt of multiple specification and nearest datum line is unchangeable.

2. The system of claim 1, wherein the specifications of the grinding pin include five types, i.e., 0#, 1#, 2#, 3#, and 4#, the 0# grinding pin is a grinding pin for establishing a grinding reference, and the 0# grinding pin has five equidistant reference lines.

3. The unicondylar abrasive osteotomy system of claim 2, wherein the same size abrasive plugs have different fiducial lines each having a different color and a 1mm spacing between adjacent fiducial lines, and wherein different sizes of abrasive plugs have the same fiducial line color.

4. The uni-condylar abrasive osteotomy system of claim 3, wherein the multi-gauge abrading pin has a 25-35 mm length m from the rightmost reference line to the left end face and a 50-60 mm total length n.

5. The mono-condylar grinding and osteotomy system of claim 1, wherein the grinder middle layer has a plurality of cutting edges fixed to the front end along the circumferential direction, and the cutting edges of the plurality of cutting edges form a spherical shape, and the grinder inner core has a plurality of grinding edges fixed to the front end, and the cutting edges of the plurality of grinding edges form a spherical shape and are on the same spherical surface as the cutting edges of the cutting edges.

6. The unicondylar abrasive osteotomy system of claim 5, wherein the distance t between the rearmost end of the spherical surface on which said abrasive and cutting edges are disposed and the rightmost abrasive pin reference line is 2-3mm.

7. The mono-condylar grinding and osteotomy system of claim 5, wherein the grinder housing has a maximum diameter D of 25-35 mm, a length L from the front end of the grinder cutting edge to the rear end of the grinder housing is 25-40 mm, the cutting edge has a spherical diameter SR1 of 16-24 mm, and the grinder has several different specifications, each having the same length L, a different housing diameter D and a different cutting edge spherical diameter SR1.

8. The unicondylar abrasive osteotomy system of claim 1, wherein a stop boss is fixedly mounted to a posterior end of the abrading pin insertion hole.

9. The uni-condylar abrasive osteotomy system of claim 1, wherein a viewing window is provided in the middle of the grinder core.

10. The uni-condylar abrasive osteotomy system of claim 1, wherein the grinder core is provided at its rear end with an electric drill interface.

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