CN219271040U

CN219271040U - Femur end positioning system capable of preventing cartilage injury under arthroscope

Info

Publication number: CN219271040U
Application number: CN202123346918.6U
Authority: CN
Inventors: 郑佳鹏; 吴清泉; 林达生; 邓辉云; 肖棋; 陈章荣; 陈艺辉; 王建雄
Original assignee: Individual
Current assignee: Ninth Hospital Of Joint Service Support Force Of Chinese Pla
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2023-06-30
Anticipated expiration: 2031-12-28

Abstract

The utility model provides a femur end positioning system capable of preventing cartilage damage under an arthroscope, which comprises a positioning sleeve and a drill guide sleeve, wherein the positioning sleeve comprises a sleeve part and a positioning part, the sleeve part is of a tubular structure, a sliding through hole is formed in the sleeve part, the far end of the sleeve part extends downwards and forwards to form a positioning part in an inclined mode, the upper surface of the positioning part is provided with a V-shaped positioning surface with an obtuse angle, the drill guide sleeve comprises a guide sleeve part and a flange part, the guide sleeve part is of a columnar structure, at least one drill hole is formed in the guide sleeve part, the flange part is arranged at the near end of the guide sleeve part, and the far end of the drill guide sleeve slides into the sliding through hole of the positioning sleeve. The existing anterior cruciate ligament femur tunnel positioner is improved, the device can be replaced infrequently, and particularly, the cartilage of the internal femoral condyle is protected, so that the damage of the cartilage device in the operation process is avoided.

Description

Femur end positioning system capable of preventing cartilage injury under arthroscope

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a femur end positioning system capable of preventing cartilage damage under an arthroscope.

Background

In anterior cruciate ligament reconstruction surgery, tunnels are required to be established at the femur and tibia ends, and the transplanted tendon is fixed after being introduced, so that ligament transplantation reconstruction is completed. Among them, femoral tunnel localization is the technical core, and erroneous tunnel localization is the most main cause of anterior cruciate ligament reconstruction failure. The existing various femur locators are used in the following modes: firstly, measuring the required drilling diameter, secondly, using a positioner to assist in positioning the drill bit with the proper diameter, beating the drill bit, reserving the far end of the drill bit on a drilling position, and taking down the positioner again, only reserving the isolated drill bit at the drilling position, connecting a drilling instrument with the near end of the drill bit, starting the drilling instrument to perform drilling work, and taking down the drilling instrument and the drill bit together after the drilling is finished. The problems in this process are: in the process of drilling after the preset drill bit is connected with a drilling instrument, the isolated drill bit has no protective measure, and the situation that the drill bit is askew to damage cartilage tissues around the drill bit is likely to occur; in addition, when the drill hole is found to be unsuitable in size, and the drill hole needs to be enlarged, a set of drill bit positioners need to be replaced again, so that a surgical process needs to prepare a plurality of medical instruments, and medical resources are wasted.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the femoral end positioning system capable of preventing cartilage damage under the arthroscope can achieve the purposes that in anterior cruciate ligament reconstruction operation, femoral tunnel positioning and preparation are completed in the protective sleeve, cartilage damage of instruments in the operation process can be avoided, various surgical instruments are integrated, operation of operators is facilitated, and medical resources are saved.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a thighbone end positioning system of cartilage damage is prevented to arthroscope, includes positioning sleeve and drill guide sleeve, positioning sleeve includes sleeve portion and location portion, sleeve portion is tubular structure, establishes the slip through-hole in, the distal end of sleeve portion is inclined downwardly and forward to extend a location portion, location portion upper surface is equipped with an opening and is obtuse V type locating surface, drill guide sleeve includes guide sleeve portion and flange portion, guide sleeve portion is columnar structure, establishes at least one drill bit hole in the interior, flange portion sets up the proximal end of guide sleeve portion, the distal end slip of drill guide sleeve stretches into in the slip through-hole of positioning sleeve.

Further, the opening angle range of the V-shaped positioning surface is 98-130 degrees.

Further, the distal end face of the sleeve part is an inclined surface inclined from top to bottom to the positioning part.

Further, the positioning part has a triangular shape with a rounded distal end in a plan view.

Further, at least two drill holes on the guide sleeve part of the drill guide sleeve are eccentrically arranged.

Further, three drill holes with different diameters are eccentrically arranged on the guide sleeve part of the drill guide sleeve, and the diameters of the three drill holes are 5 mm, 6 mm and 7 mm respectively.

Further, the positioning sleeve further comprises a handle portion, the handle portion is connected to the proximal end of the sleeve portion, and an included angle between the handle portion and the sleeve portion is 89-120 degrees.

Further, the symmetry plane of the handle portion overlaps the symmetry plane of the positioning portion.

Further, still include compressing tightly piece and nut, compressing tightly piece one end is cup joints the portion, and the other end is compressing tightly the portion, be equipped with the socket hole in the socket portion, the drill bit guide pin bushing still includes cylinder portion and external screw thread portion, flange portion, cylinder portion, external screw thread portion are arranged in proper order along the direction from its proximal end to distal end on guide pin bushing portion, and the diameter is from big to little setting, compressing tightly the socket portion of piece passes through the socket hole cover is in on the cylinder portion, the nut with external screw thread portion spiro union.

Further, the compressing part of the compressing part is provided with a downward and forward bending section from top to bottom, then the compressing part is provided with a downward and backward bending section, then the compressing part is provided with a downward extending section, the downward and forward bending section and the downward and backward bending section of the compressing part are provided with limiting holes arranged in the vertical direction, the width of each limiting hole is greater than or equal to that of the handle part of the positioning sleeve, when the drill guide sleeve is completely placed in the sliding through hole of the positioning sleeve, the handle part of the positioning sleeve is positioned in the limiting hole of the compressing part, and the length of the handle part of the positioning sleeve is equal to or greater than that of the compressing part.

The utility model has the beneficial effects that: the V-shaped locating surface on the locating sleeve is contacted with the femur end to locate, the drill bit is guided to be scheduled at the femur end through the drill bit guide sleeve, the drill bit guide sleeve is taken out of a sliding through hole of the locating sleeve before drilling, the locating sleeve is still located at the femur end during drilling, the locating sleeve is protected during drilling, the drill bit cannot run out of the range of the locating sleeve, the femoral tunnel locating and preparation are completed in the protecting sleeve, cartilage tissues around the knee joint cannot be damaged due to deviation of the drill bit, the locating sleeve cannot be replaced due to diameter change of the drill bit hole, and the consistency of locating from the drill bit reservation to the drilling process is maintained.

Drawings

FIG. 1 is a perspective view of an arthroscopic cartilage damage prevention femoral head positioning system according to the embodiments of the present utility model;

FIG. 2 is a top view of an arthroscopic cartilage damage prevention femoral head positioning system according to the present utility model;

FIG. 3 is a front cross-sectional view of a positioning sleeve according to an embodiment of the present utility model;

FIG. 4 is a front cross-sectional view of an assembled drill guide sleeve, compression member and nut according to an embodiment of the present utility model;

FIG. 5 is a right side view of an assembled drill guide sleeve, compression member and nut according to an embodiment of the present utility model;

FIG. 6 is a front view of an arthroscopic cartilage damage prevention femur end positioning system for performing femur end positioning surgery in accordance with an embodiment of the present utility model;

fig. 7 is a right side cross-sectional view of an arthroscopic cartilage damage prevention femoral head positioning system for performing a femoral head positioning and drilling procedure in accordance with an embodiment of the present utility model.

Description of the reference numerals:

1. positioning a sleeve; 2. drill guide sleeve; 3. a pressing member; 4. a nut; 5. femur; 6. tibia;

11. a sleeve portion; 111. a sliding through hole; 12. a positioning part; 121. a V-shaped positioning surface; 13. a handle portion; 14. a bit depth position indicator;

21. a guide sleeve part; 211. drilling a bit hole; 22. a flange portion; 221. an anti-slip groove; 23. a cylindrical portion; 24. an external thread portion; 25. marking the diameter of a drill hole; 26. drill bit hole indication lines;

31. a socket joint part; 311. a socket hole; 32. a pressing part; 321. bending the segment downwards and forwards; 322. bending the segment downward and backward; 323. a downwardly extending section; 324. a limiting hole; 33. triangle marks.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 7, the embodiment provided by the present utility model is as follows:

the utility model provides a thighbone end positioning system of cartilage damage is prevented to arthroscope, includes positioning sleeve 1 and drill guide sleeve 2, positioning sleeve 1 includes sleeve portion 11 and location portion 12, sleeve portion 11 is tubular structure, establishes sliding through hole 111 in, the lower slant of distal end lower part of sleeve portion 11 extends a location portion 12 forward downwards, location portion 12 upper surface is equipped with a V type locating surface 121 that the opening is obtuse angle, drill guide sleeve 2 includes guide sleeve portion 21 and flange portion 22, guide sleeve portion 21 is columnar structure, establishes at least one drill bit hole 211 in the interior, flange portion 22 sets up the proximal end of guide sleeve portion 21, the distal end slip of drill guide sleeve 2 stretches into in the sliding through hole 111 of positioning sleeve 1.

When the drill bit guiding sleeve is used, the distal end of the guide sleeve 21 slides from the proximal end of the drill bit guiding sleeve 1 into the sliding through hole 111 of the guide sleeve part 11 until the distal end of the guide sleeve part 21 completely stretches into the guide sleeve part 21, specifically, when the flange part 22 of the drill bit guiding sleeve 2 touches the proximal end surface of the guide sleeve part 11, the guide sleeve part 21 completely stretches into the guide sleeve part 11, a drill bit is preset in a drill bit hole 211 of the guide sleeve part 21, the drill bit hole 211 plays a guiding role on the drill bit, the drill bit is knocked, the drill bit is preset on a femur, then the drill bit guiding sleeve 2 is slid out from the proximal end of the guide sleeve 1, a drilling instrument is connected with the drill bit positioned in the guide sleeve 1 and used for drilling, and the guide sleeve 1 is always positioned outside the drill bit in the drilling process, so that mechanical damage to surrounding cartilage of the drill bit caused by the drill bit skew can be prevented; specifically, when the drill is knocked to pre-fix the drill on the femur, the end face of the flange portion 22 of the drill guide sleeve 2 can be pressed by the thumb, so that the drill guide sleeve 2 is prevented from rotating.

The positioning part 12 of the positioning sleeve 1 plays a role in positioning, the shape of the V-shaped positioning surface 121 on the positioning part 12 is matched with the shape of the rear wall bone cortex which is continued by the outer condyle of the femur and the distal metaphyseal of the femur, when the positioning sleeve is used, the V-shaped positioning surface 121 on the positioning part 12 is abutted against the outer condyle of the femur or the rear wall bone cortex which is continued by the distal metaphyseal of the femur, and the positioning part 12 of the positioning sleeve 1 is always abutted against the femur from the positioning to the drilling process, so that the positioning consistency in the positioning and the drilling processes is maintained, the operation failure rate is reduced, and the positioning sleeve 1 is always in contact with the cartilage tissue at the periphery of the drill, so that the condition that the cartilage tissue around the drill is scratched caused by frequent replacement of the instrument is prevented, and the operation safety is good.

For fixation problems of the positioning sleeve 1, the positioning sleeve 1 can be positioned against the femur by pressing by hand on the proximal end of the positioning sleeve 1.

Further, the opening angle of the V-shaped positioning surface 121 ranges from 98 ° to 130 °, and the V-shaped positioning surface is applicable to various body types.

Preferably, the opening angle of the V-shaped positioning surface 121 is 120 °, which is suitable for most body type people.

Further, the distal end face of the sleeve portion 11 is an inclined plane inclined to the positioning portion 12 from top to bottom, when the positioning portion 12 of the positioning sleeve 1 abuts against the femur in use, a certain space is provided between the inclined plane of the distal end of the sleeve portion 11 and the femur surface, and the space is used for observing the specific position of the drill bit on the femur and the predetermined drill bit depth condition in the sleeve portion 11 under the arthroscope, so that the position of the drill bit can be conveniently adjusted, the drilling position is accurate, and the success rate of the operation is high.

Furthermore, the top view shape of the positioning part 12 is a triangle with a rounded distal end, and the rounded and triangle shape of the distal end of the positioning part 12 makes the positioning part 12 conveniently extend into the accurate position required by the operation, and the tissue around the operation part is not easy to be damaged.

Further, the lower surface of the positioning portion 12 is a plane, so that the positioning portion 12 is not easy to damage the tissue around the operation site.

Furthermore, at least two drill holes 211 on the guide sleeve part 21 of the drill guide sleeve 2 are eccentrically arranged, and the drill holes 211 are eccentrically arranged, so that the diameter of the drill guide sleeve 2 is as small as possible, the required access aperture is small during operation, and surrounding tissues of the operation part of the patient are not easily damaged; when in use, the flange part 22 of the drill guide sleeve 2 is grasped by a hand to rotate the drill guide sleeve 2, and the positions of the drill holes 211 can be adjusted when the drill guide sleeve 2 is rotated, namely, which drill hole 211 is used can be adjusted, and specifically, the drill hole 211 positioned right below the central shaft of the drill guide sleeve 2 is the currently selected drill hole 211.

Further, the guide sleeve portion 21 of the drill guide sleeve 2 is eccentrically provided with three drill holes 211 with different diameters, so that one drill guide sleeve 2 can be suitable for three drilling requirements with different diameters, when the drill guide sleeve is used, a drill is placed into the drill holes 211 with corresponding diameters according to requirements, if the drill guide sleeve 2 is not required to be replaced, the drill with larger diameter is placed into the drill holes 211 with corresponding diameters, and the drill guide sleeve 2 is rotated to perform position adjustment, so that the number of medical instruments in an operation is further reduced.

Preferably, the three drill holes 211 have diameters of 5 mm, 6 mm and 7 mm, respectively, and these three diameter sizes are currently common specifications for surgery; at present, when performing anterior cruciate ligament repair surgery, three kinds of drill bits with diameters of 5 mm, 6 mm and 7 mm and three kinds of drill bit positioners with specifications are required to be prepared in advance, then the drill bit and the drill bit positioners with corresponding specifications are selected according to the requirements during the surgery, and when the size of a drilled hole is smaller and reaming is required, the drill bit with larger diameter and the drill bit positioners with corresponding specifications are replaced for use, so that more instruments are required for the surgery; the drill with three diameters can be positioned by only using one drill guide sleeve 2, so that the number of surgical instruments is reduced, and the surgical complexity and cost are reduced.

Further, in order to facilitate the doctor to more quickly and accurately put the drill bit into the corresponding drill bit hole 211, the proximal end face of the drill bit guide sleeve 2 is engraved with a drill bit hole diameter mark 25, for example, the diameters of three drill bit holes 211 on the drill bit guide sleeve 2 are 5 mm, 6 mm and 7 mm respectively, and the proximal end face of the drill bit guide sleeve 2 is engraved with three numbers of 5, 6 and 7, which are marked on the outer side edge of the corresponding drill bit hole 211.

Preferably, the distal end of the drill guide sleeve 2 has a conical surface structure, and the end is hemispherical, so that the distal end of the drill guide sleeve 2 can be effectively prevented from damaging tissues around the drill.

Further, in order to facilitate a doctor to rapidly and accurately rotate the drill bit hole 211 to a position right below the central axis of the drill bit guide sleeve 2, a drill bit hole indication line 26 is engraved on the proximal end face of the drill bit guide sleeve 2 and used for indicating that the corresponding drill bit hole 211 is right below the central axis of the drill bit guide sleeve 2; preferably, the pilot bit line 26 is located on the outside of the pilot bit diameter indicator 25.

Further, a plurality of anti-slip grooves 221 are uniformly distributed on the outer circumferential surface of the flange 22, so as to play an anti-slip role when the drill guide sleeve 2 is rotated by holding the flange 22.

Preferably, the flange portion 22 is disposed at a proximal end portion of the guide sleeve portion 21, and a proximal end surface of the flange portion 22 overlaps with a proximal end surface of the guide sleeve portion 21, so that a proximal end surface of the drill guide sleeve 2 is flattened.

Further, the positioning sleeve 1 further includes a handle portion 13, the handle portion 13 is connected to the proximal end of the sleeve portion 11, and the positioning sleeve 1 is pressed by grasping the pressing handle portion 13, so that the positioning portion 12 of the positioning sleeve 1 always abuts against the femur.

Further, the handle portion 13 has a rod-shaped structure, and an included angle between the handle portion 13 and the sleeve portion 11 is 89-120 degrees, so that one hand can grip the handle portion 13 to press and apply force.

Preferably, the angle between the handle portion 13 and the sleeve portion 11 is 110 °, and the handle portion 13 is pressed comfortably, and the positioning sleeve 1 is firm in structure and not easy to damage.

Preferably, the handle portion 13 of the positioning sleeve 1 has a cylindrical structure, or has a stepped cylindrical structure with a thin upper part and a thick lower part and a conical surface at the middle part, and has a smooth outer circular surface, so that the handle portion 13 is effectively prevented from scratching the hands of a doctor.

Preferably, the symmetry plane of the positioning portion 12 is a vertical plane including the central axis of the sleeve portion 11, and the symmetry plane of the handle portion 13 overlaps with the symmetry plane of the positioning portion 12, so that the force pressed by a human hand on the handle portion 13 is positive on the positioning portion 12, so that the stress of the positioning sleeve 1 is balanced, and the positioning sleeve is not easy to skew during use.

Further, if the handle portion 13 and the sleeve portion 11 are made of plastic, they are integrally formed, and if the handle portion 13 and the sleeve portion 11 are made of stainless steel, they are welded together.

Further, the drill guide sleeve 2 further comprises a cylindrical portion 23 and an external thread portion 24, the flange portion 22, the cylindrical portion 23 and the external thread portion 24 are sequentially arranged on the guide sleeve portion 21 along the direction from the proximal end to the distal end, the diameters are set from large to small, the sleeved portion 31 of the compressing member 3 is sleeved on the cylindrical portion 23 through the sleeved hole 311, and the nut 4 is in threaded connection with the external thread portion 24.

During installation, the sleeve joint part 31 of the pressing piece 3 is sleeved on the cylindrical part 23 of the drill guide sleeve 2, then the nut 4 is in threaded connection with the external thread part 24 of the drill guide sleeve 2, the proximal end of the sleeve joint part 31 of the pressing piece 3 is blocked by the flange part 22 of the drill guide sleeve 2, the distal end of the sleeve joint part is blocked by the nut 4 and cannot be separated from the drill guide sleeve 2, when the nut 4 touches the proximal end face of the positioning sleeve 1, the drill guide sleeve 2 completely stretches into the positioning sleeve 1, when the pressing part 32 is not pressed by hands, the pressing piece 3 is in sliding sleeve joint with the cylindrical part 23 of the drill guide sleeve 2 through the sleeve joint hole 311, the drill guide sleeve 2 can move or rotate, when the pressing part 32 is pressed by hands, the pressing piece 3 is turned over to a certain extent, the sleeve joint part 31 is pressed on the cylindrical part 23, the drill guide sleeve 2 cannot slide or rotate relative to the pressing piece 3, the drill guide sleeve 2 is manually locked, and when a drill is knocked to be preset, the drill guide sleeve 2 can be effectively prevented from moving or rotating, and the preset position of the drill is accurate.

Further, the width of the cylindrical portion 23 is greater than the width of the socket portion 31 of the pressing member 3, so that when the hand presses the pressing portion 32, the socket portion 31 has a certain overturning space, and after the socket portion 31 is overturned by a certain angle, the drill guide sleeve 2 is pressed and locked.

Further, the pressing portion 32 of the pressing member 3 is provided with a downward and forward bending section 321 from top to bottom, and then is provided with a downward and backward bending section 322, and then is provided with a downward extending section 323, the downward and forward bending section 321 and the downward and backward bending section 322 of the pressing portion 32 are provided with a limiting hole 324 arranged in the vertical direction, the width of the limiting hole 324 is greater than or equal to that of the handle portion 13 of the positioning sleeve 1, when the drill guide sleeve 2 is completely placed in the sliding through hole 111 of the positioning sleeve 1, the handle portion 13 of the positioning sleeve 1 is located in the limiting hole 324 of the pressing member 3, and the length of the handle portion 13 of the positioning sleeve 1 is equal to or greater than that of the pressing portion 32 of the pressing member 3.

The handle part 13 of the positioning sleeve 1 is limited in the limiting hole 324 of the compressing part 32, on one hand, one hand can hold the handle part 13 and the compressing part 32 at the same time, so that one doctor can finish the operation process of presetting the drill bit on the femur, on the other hand, the handle part 13 can limit the displacement of the compressing part 32 along the width direction of the limiting hole 324, and further, the compressing piece 3 and the drill guide sleeve 2 can not move or rotate in the operation process; preferably, the width of the limiting hole 324 is equal to the width of the handle portion 13 of the positioning sleeve 1, so that the pressing member 3 can be effectively prevented from moving or rotating when the pressing member 3 is pressed by a hand; when the pressing member 3 is pressed by hand, the inner rear end portion of the palm is pressed against the lower portion of the downward and backward bending section 322 and the downward extending section 323, and the structure makes the palm stress surface relatively flat, and the palm is not easily injured.

Preferably, the compressing element 3 has a plate-shaped structure, so that the contact area between the palm and the compressing element 3 is large, and the palm is not easy to be injured.

Further, a triangular mark 33 is provided in the middle of the proximal end surface of the pressing member 3, a sharp angle of the triangular mark 33 faces upwards, and it can be seen by the triangular mark 33 whether the position of the drill hole 211 located directly below the central axis of the positioning sleeve 1 is accurate, specifically, when the drill hole indication line 26 corresponding to the drill hole 211 is aligned with the upper sharp angle of the triangular mark 33, the position of the drill hole 211 is adjusted.

Further, a drill bit depth position indication line 14 is provided on the upper surface of the positioning sleeve 1, so as to facilitate the doctor to measure or estimate the depth of the current drill bit placed in the femur.

The method of using the arthroscopic cartilage damage prevention femur end positioning system of the present application will be described with reference to fig. 1 to 7: the operation is performed under an arthroscope, firstly, the size of the aperture required to be punched on a femur is measured, the aperture is 5 mm, then, a drill bit with the diameter of 5 mm is put into a drill bit hole 211 of a drill bit guide sleeve 2, then, the drill bit guide sleeve 2 is put into a sliding through hole 111 of a positioning sleeve 1, when a nut 4 touches the near end surface of the positioning sleeve 1, the drill bit guide sleeve 2 completely stretches into the positioning sleeve 1, then, the handle part 13 of the positioning sleeve 1 and a pressing part 32 of a pressing piece 3 are held by a left hand, but the pressing part 32 is not pressed, the flange part 22 of the drill bit guide sleeve 2 is rotated by a right hand, the drill bit guide sleeve 2 is just opposite to a triangular mark 33 on the pressing piece 3 by a drill bit hole indicating line 26 corresponding to the drill bit hole 211, at the time, the left hand is pressed by the handle part 13 and the pressing part 32, the positioning sleeve 1 stretches into a knee joint, the positioning sleeve 1 is positioned below the femur 5, the intercondle of the positioning sleeve 1 stretches into and leans against the outer side, the drill bit guide sleeve 1 is pulled out by the left hand, the drilling hole is pressed by the left hand, the drilling device is just pressed by the left hand, the left hand is pressed by the left hand, and the pressing part 13 and the pressing piece 2 is pressed by the left hand, and the drilling device is pulled by the left hand is pulled by the 3, and the left hand is pressed by the 3, and the 3 is just the drilling hole is pressed by the 3, and the drilling part is pressed by the 3; when reaming is needed, for example, when a hole with the diameter of 6 mm is needed to be enlarged, a drill with the diameter of 6 mm is placed into a drill hole 211 with the diameter of 6 mm of the drill guide sleeve 2, the drill guide sleeve 2 is placed into a sliding through hole 111 of the positioning sleeve 1 again, the right-hand rotating flange part 22 adjusts the drill hole 211 with the diameter of 6 mm to be positioned right below the central shaft of the drill guide sleeve 2, the left hand tightly holds and presses the handle part 13 and the pressing part 32, the right hand uses a knocking instrument to knock the drill with the diameter of 6 mm positioned in the drill hole 211, the drill with the diameter of 6 mm is reserved on a femur, then the drill guide sleeve 2 is taken out by the right hand, and the drill instrument is used for driving the drill with the diameter of 6 mm; after the drilling is finished, the drilling device, the 6 mm drill bit and the positioning sleeve 1 are taken out.

In summary, the femur end positioning system for preventing cartilage damage under arthroscope provided by the utility model has the beneficial effects that:

1. the positioning sleeve 1 is arranged for positioning protection in the process of reserving the drill bit into the femur and drilling the drill bit, so that the damage to cartilage around the drill bit caused by the apparatus can be effectively avoided;

2. the number of the used instruments in the operation process is small, and the instruments do not need to be replaced frequently;

3. the position of the drill bit hole 211 on the drill bit guide sleeve 2 can be conveniently, quickly and accurately adjusted, the drill bit guide sleeve 2 can be quickly and accurately locked and unlocked, and the operation is quick, convenient and accurate;

4. the functions of positioning, soft tissue protection and multi-specification drill holes 211 are integrated, so that the operation safety is good, the operation is simple and convenient, and the operation time is shortened.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims

1. The utility model provides a thighbone end positioning system of cartilage damage is prevented to arthroscope, its characterized in that includes positioning sleeve and drill guide sleeve, positioning sleeve includes sleeve portion and location portion, sleeve portion is tubular structure, establishes the slip through-hole in, the distal end of sleeve portion extends a location portion downwards forward to one side, location portion upper surface is equipped with an opening and is obtuse V type locating surface, drill guide sleeve includes guide sleeve portion and flange portion, guide sleeve portion is columnar structure, establishes at least one drill hole in the interior, flange portion sets up the proximal end of guide sleeve portion, the distal end slip of drill guide sleeve stretches into in the slip through-hole of positioning sleeve.

2. The arthroscopic cartilage damage prevention femur end positioning system of claim 1 wherein the V-shaped positioning surface has an opening angle in the range of 98 ° to 130 °.

3. The arthroscopic cartilage damage prevention femur end positioning system of claim 1 wherein the distal end surface of the sleeve portion is a beveled surface that slopes from top to bottom toward the positioning portion.

4. The arthroscopic cartilage damage prevention femur end positioning system of claim 1 wherein the top view shape of the positioning section is triangular with rounded distal ends.

5. The arthroscopic cartilage damage prevention femur end positioning system of claim 1 wherein at least two drill holes in the guide sleeve portion of the drill guide sleeve are eccentrically positioned.

6. The arthroscopic cartilage damage prevention femur end positioning system of claim 5, wherein the drill guide sleeve portion is eccentrically provided with three drill holes with different diameters, the diameters of the three drill holes being 5 mm, 6 mm and 7 mm, respectively.

7. The arthroscopic cartilage damage prevention femoral end positioning system of claim 1 wherein said positioning sleeve further comprises a handle portion, said handle portion being attached to said proximal end of said sleeve portion, said handle portion being at an angle of 89 ° to 120 ° to said sleeve portion.

8. The arthroscopic cartilage damage prevention femur end positioning system of claim 7 wherein the symmetry plane of the handle portion overlaps the symmetry plane of the positioning portion.

9. The arthroscopic cartilage damage prevention femur end positioning system of claim 7, further comprising a compressing member and a nut, wherein one end of the compressing member is a sleeved part, the other end of the compressing member is a compressing part, a sleeved hole is formed in the sleeved part, the drill guide sleeve further comprises a cylindrical part and an external thread part, the flange part, the cylindrical part and the external thread part are sequentially distributed on the guide sleeve part along the direction from the proximal end to the distal end of the guide sleeve part, the diameters of the flange part, the cylindrical part and the external thread part are set from large to small, the sleeved part of the compressing member is sleeved on the cylindrical part through the sleeved hole, and the nut is in threaded connection with the external thread part.

10. The arthroscopic cartilage damage prevention femur end positioning system of claim 9 wherein the compression part of the compression member is provided with a downward and forward bending section from top to bottom, the downward and rearward bending section is provided with a downward and extending section, the downward and forward bending section and the downward and rearward bending section of the compression part are provided with limiting holes arranged in the vertical direction, the width of the limiting holes is greater than or equal to the width of the handle part of the positioning sleeve, when the drill guide sleeve is completely placed in the sliding through hole of the positioning sleeve, the handle part of the positioning sleeve is positioned in the limiting hole of the compression member, and the length of the handle part of the positioning sleeve is equal to or greater than the length of the compression part of the compression member.