Adjustable acromion bone knife

Abstract

The present application relates to the field of medical device technology, and in particular to an adjustable acromion bone knife, which includes a knife handle, a knife rod, a positioning sleeve, a positioning needle and a knife head, wherein the knife rod is connected to the knife handle, the knife head is connected to the end of the knife rod away from the knife handle, the positioning sleeve is inserted into the knife handle for inserting the positioning needle, the positioning needle is slidably connected to the positioning sleeve, and the positioning sleeve and the knife rod are arranged in parallel; a cavity is provided at the end of the knife handle away from the knife rod, and the positioning needle enters the positioning sleeve through the cavity, and a scale line is provided on the side wall of the cavity, and the scale line is arranged along the length direction of the knife handle. Before the operation, the positioning needle is inserted into the positioning sleeve and the end of the positioning needle close to the knife handle is aligned with the zero scale of the scale line. The present application has the effect of realizing accurate control of the amount of bone removal during the operation to improve the quality of the operation.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to an adjustable acromion osteotome. Background Art

[0002] The shoulder is the part between the back and ribs to the face and head. People may develop some shoulder diseases due to incorrect living habits and exercise methods, such as: periarthritis of the shoulder, rotator cuff tear and shoulder impingement syndrome.

[0003] Shoulder impingement syndrome is a common shoulder disease, mainly manifested by pain and limited movement (pain occurs when the arm is raised 60° to 120°). The pathological basis of the disease involves bone abnormalities at the anterolateral end of the acromion, the formation of osteophytes, and other factors that reduce the distance between the acromion and the humeral head, all of which may cause the subacromial structure to be squeezed and impinged, especially in the anterior 1 / 3 of the acromion and below the acromioclavicular joint. Repeated impacts can damage the bursa and tendons, and even cause tendon rupture. The shape of the acromion can be divided into three types (flat acromion, arc-shaped acromion, hook-shaped acromion), two of which are prone to impingement (arc-shaped acromion, hook-shaped acromion).

[0004] The treatment method of shoulder impingement syndrome recorded in the relevant technology usually requires surgery to remove the hyperplastic bone at the distal end of the acromion. The commonly used method is to use a grinding drill, that is, before the operation, the doctor first performs an X-ray examination of the shoulder joint to measure the thickness of the acromion on the X-ray film at the supraspinatus muscle exit position, and calculate the amount of bone that needs to be removed. The doctor then performs surgery based on the examination results. However, the determination of the amount of bone removal mainly depends on the doctor's experience and lacks quantitative standards. If insufficient bone is removed, the impingement may not be completely eliminated and the patient will still feel pain. On the contrary, if too much bone is removed, it may cause acromion fractures, affecting the attachment of the deltoid muscle, thereby causing shoulder pain and weakened upper limb abduction strength. Therefore, it is an urgent problem to achieve precise control of the amount of bone removal during surgery to improve the quality of surgery. Summary of the invention

[0005] In order to achieve precise control of the amount of bone removal during surgery and improve the quality of the surgery, the present application provides an adjustable acromion bone knife.

[0006] The adjustable acromion bone knife provided in this application adopts the following technical solution:

[0007] An adjustable acromion bone knife comprises a knife handle, a knife rod, a positioning sleeve, a positioning needle and a knife head, wherein the knife rod is connected to the knife handle, the knife head is connected to one end of the knife rod away from the knife handle, the positioning sleeve is penetrated through the knife handle and used for penetrating the positioning needle, and the positioning sleeve and the knife rod are arranged in parallel; a cavity is opened at one end of the knife handle away from the knife rod, the positioning needle enters the positioning sleeve through the cavity, scale lines are arranged on the side wall of the cavity, and the scale lines are arranged along the length direction of the knife handle. Before performing an operation, the positioning needle is penetrated into the positioning sleeve and the end of the positioning needle close to the knife handle is aligned with the zero scale of the scale line.

[0008] By adopting the above technical solution, before the operation, the doctor first performs an X-ray examination of the shoulder joint in order to measure the thickness of the acromion on the X-ray film at the supraspinatus muscle exit position and calculate the bone mass to be removed. During the operation, the blade is inserted into the position to be removed in the human body, the positioning pin is inserted into the positioning sleeve and fixed on the acromion, and the end of the positioning pin close to the handle is flush with the zero scale of the scale line. By knocking on the tail of the handle, the acromion osteophyte begins to be cut. When the handle is knocked, the positioning pin is fixed on the acromion. When the blade moves forward, the positioning pin and the positioning sleeve have a sliding relationship, and the positioning pin moves along the scale line. The cutting depth can be determined by checking the corresponding position of the positioning pin inside the handle and the scale line, and according to the position relationship, it is determined whether the acromion osteophyte is completely removed. In this way, the doctor can accurately control the amount of bone removal according to the patient's specific situation and surgical needs, which not only eliminates the uncertainty of the doctor's experience, but also greatly improves the quality of the operation.

[0009] Optionally, the cutter head and the cutter rod are detachably connected.

[0010] By adopting the above technical solution, the cutter head can be quickly connected to the cutter rod, which facilitates the installation and replacement of the cutter head.

[0011] Optionally, a fixing assembly is also included, through which the cutter head and the cutter rod can be connected together.

[0012] By adopting the above technical solution, the cutter head and the cutter rod are fixed by means of a fixing component, thereby improving the practicality and convenience of the cutter head installation.

[0013] Optionally, an arc-shaped connecting rod is connected to the end of the tool rod, a recess of the connecting rod is toward the positioning sleeve and extends away from the positioning sleeve, a sliding groove is provided on the connecting rod, and the sliding groove is opened along the extension direction of the connecting rod, the tool head includes a main body and a sliding rod integrally formed with the main body, the sliding rod can slide in the sliding groove, and the sliding rod and the connecting rod are fixed by the fixing assembly.

[0014] By adopting the above technical solution, the cutter head is slid along the direction of the slide groove until the resection requirement is met, and then the cutter head is fixed by the fixing component. This can meet the resection requirements of acromion osteophytes of different sizes, thereby improving the convenience and accuracy of cutter head adjustment.

[0015] Optionally, a plurality of slots are respectively processed on the side walls on both sides of the slide groove, and the slots on each side wall are spaced apart along the opening direction of the slide groove, and the slots on the two side walls are symmetrically distributed about the central axis of the slide groove, and shift teeth are respectively installed on both sides of the cutter head, and when the cutter head slides along the slide groove, the two shift teeth respectively contact the slots on both sides.

[0016] By adopting the above technical solution, during the sliding process of the cutter head, the shifting teeth contact the slot to produce a sound. By counting the number of shifting movements, the sliding distance of the cutter head can be obtained, and then the adjustment distance between the positioning sleeve and the cutter head can be determined.

[0017] Optionally, a limit spring is further included, one end of the shifting tooth is rotatably connected to the cutter head, two limit springs are provided and the two limit springs are respectively located on both sides of the shifting tooth, and both ends of the limit spring are respectively connected to the shifting tooth and the cutter head.

[0018] By adopting the above technical solution, under the action of the limit spring, the shifting tooth is flexibly connected. When the shifting tooth and the card slot are in contact, they are no longer rigidly connected, which can protect both the shifting tooth and the card slot.

[0019] Optionally, the fixing assembly includes a screw and a fastening nut, the screw is connected to the cutter head, a slide is provided on the connecting rod, the slide is connected to the slide groove, and the width of the slide is equal to the diameter of the screw.

[0020] By adopting the above technical solution, when adjusting, the screw is slid along the slideway, and after sliding to the specified position, it is fixed with a fastening nut. At the same time, the cooperation between the slideway and the screw is utilized to ensure the accuracy of the sliding direction of the cutter head.

[0021] Optionally, it also includes an interface, which is connected to the inner wall of the cavity, and the end of the interface away from the positioning sleeve can be connected to an external suction device, and bone can enter the suction device through the positioning sleeve and the interface in sequence.

[0022] By adopting the above technical solution and utilizing the interface and external suction equipment, the bone debris generated during the operation can be efficiently processed, thus avoiding the scattering of bone debris and the potential impact on the quality of the operation.

[0023] Optionally, the interface is detachably connected to the cavity.

[0024] By adopting the above technical solution, the convenience of operation is improved. That is, before the operation, the interface can be removed to facilitate the insertion of the positioning needle. After the operation, the positioning needle is taken out and the interface is installed, and bone suction can be carried out. The working state switching is convenient and fast.

[0025] Optionally, one end of the positioning sleeve close to the tool handle is aligned with the zero mark of the scale line.

[0026] By adopting the above technical solution, when the positioning needle is inserted, when the end of the positioning needle is aligned with the end of the positioning sleeve close to the tool handle, the end of the positioning needle and the zero scale of the scale line can be aligned, which is convenient for positioning.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The present application provides an adjustable acromion bone knife, which includes a knife handle, a knife rod, a positioning sleeve and a knife head. The knife handle is formed with a cavity, and the inner wall of the cavity is provided with scale lines. The cutting depth can be determined by checking the corresponding position of the positioning needle inside the knife handle and the scale line. The doctor can flexibly adjust the blade according to the patient's specific situation and surgical needs, and accurately control the amount of bone removed. This not only eliminates the uncertainty of the doctor's experience, but also greatly improves the quality of the operation;

[0029] 2. The present application is also provided with a threaded connecting rod, and a sliding groove is provided at one end of the knife rod away from the knife handle. During surgery, the distance between the knife head at the front end of the bone knife and the positioning sleeve can be adjusted according to the conditions of different patients. Such a design makes the surgical operation more accurate and efficient;

[0030] 3. The present application also provides an interface, which can be inserted into the cavity and threadedly connected to the handle, the end of the interface located in the cavity can abut against the positioning sleeve, and the end of the interface away from the positioning sleeve can be connected to an external suction device. The interface and the external suction device can efficiently handle bone debris generated during surgery, avoiding the problem of scattered bone debris and potential impact on the quality of surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the adjustable acromion bone knife in the present application;

[0032] Figure 2 This is a schematic diagram of the structure of the adjustable acromion osteotome in the present application after the interface is hidden;

[0033] Figure 3 It is a schematic diagram of the installation of the tool bar and the tool head in this application;

[0034] Figure 4 It is a schematic diagram of the installation of the tool bar and the tool head in this application;

[0035] Figure 5 It is a schematic diagram of the structure of the knife bar in this application;

[0036] Figure 6 It is a schematic diagram of the structure of the cutter head in this application.

[0037] Explanation of the accompanying drawings: 1. handle; 2. knife rod; 3. positioning sleeve; 4. knife head; 41. main body; 42. sliding rod; 5. cavity; 6. scale line; 7. connecting rod; 8. fixing assembly; 81. screw rod; 82. fastening nut; 9. slide groove; 10. slideway; 11. slot; 12. shifting tooth; 13. limit spring; 14. interface. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-6 This application is described in further detail.

[0039] Before the operation, the doctor first performs an X-ray examination of the shoulder joint. Based on the examination results, the doctor measures the thickness of the acromion on the supraspinatus muscle exit X-ray film and calculates the amount of bone that needs to be removed.

[0040] The present application embodiment discloses an adjustable acromion osteotome, referring to Figure 1 and Figure 2 The adjustable acromion bone knife includes a handle 1, a knife bar 2, a positioning sleeve 3, a positioning needle (not shown in the figure) and a knife head 4. The knife bar 2 is connected to the handle 1, and the knife head 4 is connected to the end of the knife bar 2 away from the handle 1. The positioning sleeve 3 is passed through and fixed on the handle 1. The positioning sleeve 3 is used to pass the positioning needle and the positioning needle and the positioning sleeve 3 are slidably connected. The positioning sleeve 3 and the knife bar 2 are arranged in parallel. A cavity 5 is opened at the end of the knife bar 1 away from the knife bar 2. The positioning needle enters the positioning sleeve 3 through the cavity 5. The side wall of the cavity 5 is provided with a scale line 6, and the scale line 6 is arranged along the length direction of the knife bar 1. Before the operation, the end of the positioning needle close to the handle 1 is aligned with the zero scale of the scale line 6.

[0041] During the operation, the cutter head 4 is inserted into the position of the osteophyte to be removed in the patient's body, the positioning needle is inserted into the positioning sleeve 3, and the tip of the positioning needle is fixed on the acromion, and the end of the positioning needle close to the handle 1 is flush with the zero scale of the scale line 6. By knocking the tail of the handle 1, the cutter head 4 is pushed forward. Since the positioning needle is fixed on the acromion, when the cutter head 4 moves forward, the positioning needle can move along the scale line 6 by using the sliding relationship between the positioning needle and the positioning sleeve 3. In this way, the cutting depth can be determined by checking the corresponding position of the positioning needle inside the handle 1 and the scale line 6, and according to the bone quality calculated before the operation, it is determined whether the acromion osteophyte is completely removed. In this way, not only the uncertainty of the doctor's experience is eliminated, but also the quality of the operation is greatly improved.

[0042] Specifically, refer to Figure 1 and Figure 2, an arc-shaped connecting rod 7 is connected to the end of the shank 2, and the concave part of the connecting rod 7 is extended toward the positioning sleeve 3 and away from the positioning sleeve 3, so as to form a sufficient space for installing the cutter head 4. The shank 2 and the positioning sleeve 3 are arranged in a close fit to ensure the stability and compactness of the overall structure. The end of the positioning sleeve 3 away from the handle 1 is an oblique cut, so that the end face of the positioning sleeve 3 away from the handle 1 is flush with the upper surface of the connecting rod 7, avoiding the influence of the positioning sleeve 3 during the cutting process. Of course, the connection method of the positioning sleeve 3 and the handle 1, and the connection method of the shank 2 and the handle 1 are not specifically limited in this embodiment.

[0043] In this embodiment, the end of the positioning sleeve 3 close to the handle 1 is aligned with the zero scale of the scale line 6. When the positioning needle is inserted, when the end of the positioning needle is aligned with the end of the positioning sleeve 3 close to the handle 1, the end of the positioning needle can be aligned with the zero scale of the scale line 6, which is convenient for positioning.

[0044] In this embodiment, the cutter head 4 and the cutter bar 2 are detachably connected, so that the cutter head 4 can be quickly connected to the cutter bar 2, which is convenient for installation and replacement of the cutter head 4. Specifically, the cutter head 4 is detachably fixed by a fixing assembly 8. The fixing assembly 8 includes a screw 81 and a fastening nut 82. The screw 81 is connected to the cutter head 4. By screwing the fastening nut 82, the cutter head 4 is fastened.

[0045] Further, refer to Figure 3 and Figure 4 The cutter head 4 includes a main body 41 and a sliding rod 42 integrally formed with the main body 41. A sliding groove 9 is provided on the connecting rod 7. The sliding groove 9 is provided along the extending direction of the connecting rod 7. The sliding rod 42 can slide in the sliding groove 9. When adjusting, the sliding rod 42 slides in the sliding groove 9, so that the distance between the cutter head 4 and the positioning sleeve 3 changes, so as to meet the removal requirements of acromion osteophytes of different sizes. Finally, the cutter head 4 is fixed by the cooperation of the screw rod 81 and the fastening nut 82.

[0046] Of course, a blade is formed on the body of the cutter head 4, and the blade can always be parallel to the axis of the positioning needle during the adjustment process, that is, when the sliding rod 42 slides in the sliding groove 9, the body is only adjusted up and down, and the angle will not change.

[0047] The specific surgical procedure is as follows: according to the inspection results, adjust the position of the cutter head 4, ensure that the distance between the cutter head 4 and the positioning sleeve 3 meets the surgical requirements, and then screw the fastening nut 82 to fix the cutter head 4. Insert the cutter head 4 into the position of the bone spur to be removed in the patient's body, insert the positioning needle into the positioning sleeve 3 and fix the tip of the positioning needle on the acromion, and make the end of the positioning needle close to the handle 1 flush with the end of the positioning sleeve 3 close to the handle 1 (the end of the positioning needle close to the handle 1 is flush with the zero scale of the scale line 6). By knocking the tail of the handle 1, the cutter head 4 is pushed forward. Since the positioning needle is fixed on the acromion, when the cutter head 4 moves forward, the positioning needle can move along the scale line 6 by using the sliding relationship between the positioning needle and the positioning sleeve 3, and the cutting depth can be determined by checking the corresponding position of the positioning needle inside the handle 1 and the scale line 6.

[0048] Reference Figure 4 and Figure 5 The connecting rod 7 is provided with a slideway 10, which is connected to the slide groove 9, and the width of the slideway 10 is equal to the diameter of the screw 81. The design of the slideway 10 limits the sliding track of the cutter head 4, that is, when the sliding rod 42 slides in the slide groove 9, the direction of the cutter head 4 is always correct, ensuring the smooth progress of the subsequent operation. Of course, one end of the screw 81 is fixedly connected to the cutter head 4, and when the cutter head 4 slides, the screw 81 can move accordingly.

[0049] Reference Figure 4 and Figure 5 A plurality of slots 11 are processed on the side walls on both sides of the slide 9. The slots 11 on each side wall are spaced apart along the opening direction of the slide 9. The slots 11 on the two side walls are symmetrically distributed about the central axis of the slide 9. The two sides of the cutter head 4 are respectively installed with shifting teeth 12. When the cutter head 4 slides along the slide 9, the two shifting teeth 12 contact the slots 11 on both sides. During the sliding process of the cutter head 4, the shifting teeth 12 contact the slots 11 to produce a sound. By counting the number of shifting, the sliding distance of the cutter head 4 can be obtained, and then the adjustment distance between the positioning sleeve 3 and the cutter head 4 can be determined.

[0050] It should be noted that the slots 11 are evenly spaced, so that the distance change of the shifting teeth 12 from one slot 11 to another adjacent slot 11 is fixed. Further, the relationship between the distance change between the axis of the positioning sleeve 3 and the cutter head 4 is determined by the change in the distance between the slots 11 and the slots 11, that is, each time the cutter head 4 moves a slot 11, the distance change between the axis of the cutter head 4 and the positioning sleeve 3 corresponds. In this way, the adjustment of the cutter head 4 is more convenient and accurate.

[0051] Of course, if the shift tooth 12 is fixedly connected to the cutter head 4, when the shift tooth 12 is made of a non-deformable material, the shift tooth 12 may be damaged or even broken when it is moved out of the slot 11; when the shift tooth 12 is made of a deformable material, on the one hand, the deformable material may be easily worn out and have a short service life; on the other hand, the shifting effect produced by the deformable material is not good.

[0052] In this embodiment, refer to Figure 5 and Figure 6 , and further includes a limit spring 13. One end of the shifting tooth 12 is rotatably connected to the cutter head 4. Two limit springs 13 are provided and the two limit springs 13 are respectively located on both sides of the shifting tooth 12. The two ends of the limit spring 13 are respectively connected to the shifting tooth 12 and the cutter head 4. Under the action of the limit spring 13, the shifting tooth 12 is flexibly connected. When the shifting tooth 12 and the card slot 11 are in contact, they are no longer rigidly connected. The limit spring 13 on one side is compressed, and the limit spring 13 on the other side is stretched. In this way, both the shifting tooth 12 and the card slot 11 can be protected. At the same time, when the shifting tooth 12 and the card slot 11 are in contact, the shifting feeling can be improved, and the effect is better.

[0053] In particular, refer to Figure 1 and Figure 2 , and also includes an interface 14, which is connected to the inner wall of the cavity 5, and the end of the interface 14 away from the positioning sleeve 3 can be connected to an external suction device, and the bone can enter the suction device through the positioning sleeve 3 and the interface 14 in sequence. The interface 14 and the external suction device can efficiently handle the bone debris generated during the operation, avoiding the problem of scattered bone debris and potential impact on the quality of the operation.

[0054] Of course, the interface 14 and the cavity 5 are preferably detachably connected to improve the convenience of operation. That is, before the operation, the interface 14 can be removed to facilitate the insertion of the positioning needle. After the operation, the positioning needle is removed and the interface 14 is installed, and bone suction can be carried out. The working state switching is convenient and fast.

[0055] In this embodiment, the detachable method is threaded connection, which is quick and convenient to install on the one hand, and has good sealing performance and is not easy to leak during the suction process. The thread should be processed away from the scale line 6.

[0056] Of course, in order to facilitate operation, the handle 1 is preferably subjected to anti-skid treatment, for example, by processing anti-skid patterns, covering with anti-skid materials, etc.

[0057] In this embodiment, the blade head 4, the blade rod 2, the blade handle 1, the positioning sleeve 3 and the positioning needle are preferably made of medical stainless steel. On the one hand, they will not cause harm to the patient during the operation; on the other hand, they can ensure the strength during the operation so as to successfully complete the removal of bone spurs.

[0058] The implementation principle of an adjustable acromion bone knife in the embodiment of the present application is as follows: before the operation, the doctor first performs an X-ray examination on the shoulder joint to measure the thickness of the acromion on the X-ray film at the supraspinatus muscle exit position, and calculates the bone mass to be removed, and then removes the interface 14, adjusts the position of the cutter head 4 and fixes it. During the operation, the cutter head 4 is inserted into the position to be removed in the human body, the positioning needle is inserted into the positioning sleeve 3 and fixed on the acromion, and the end of the positioning needle close to the handle 1 is flush with the zero scale of the scale line 6. By knocking the tail of the handle 1, the acromion osteophyte begins to be cut. When the handle 1 is knocked, the positioning needle is fixed on the acromion. When the cutter head 4 moves forward, the positioning needle and the positioning sleeve 3 have a sliding relationship, and the positioning needle moves along the scale line 6. The cutting depth can be determined by checking the corresponding position of the positioning needle inside the handle 1 and the scale line 6, and according to the position relationship, it is determined whether the acromion osteophyte is completely removed. In this way, the doctor can accurately control the amount of bone removal according to the patient's specific conditions and surgical requirements, which not only eliminates the uncertainty of the doctor's experience, but also greatly improves the quality of the surgery. After the osteophyte is removed, the positioning needle is removed, the interface 14 is installed, and the interface 14 is connected to an external suction device to suck out the bone debris generated during the operation.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An adjustable acromion osteotome, characterized in that: The knife comprises a knife handle (1), a knife rod (2), a positioning sleeve (3), a positioning needle and a knife head (4), wherein the knife rod (2) is connected to the knife handle (1), and the knife head (4) is connected to one end of the knife rod (2) away from the knife handle (1); the positioning sleeve (3) is inserted into the knife handle (1) and is used for inserting the positioning needle; the positioning needle is slidably connected to the positioning sleeve (3); the positioning sleeve (3) and the knife rod (2) are arranged in parallel; a cavity (5) is provided at one end of the knife handle (1) away from the knife rod (2); the positioning needle enters the positioning sleeve (3) through the cavity (5); a scale line (6) is arranged on the side wall of the cavity (5); the scale line (6) is arranged along the length direction of the knife handle (1); before performing an operation, the positioning needle is inserted into the positioning sleeve (3) and the end of the positioning needle close to the knife handle (1) is aligned with the zero scale of the scale line (6); It also includes a fixing assembly (8), through which the cutter head (4) and the cutter rod (2) can be connected. Together; The end of the knife rod (2) is connected to an arc-shaped connecting rod (7), and the concave part of the connecting rod (7) faces the positioning sleeve (3) and The connecting rod (7) extends in a direction away from the positioning sleeve (3), and a slide groove (9) is provided on the connecting rod (7), and the slide groove (9) is provided along the extension direction of the connecting rod (7). The cutter head (4) includes a main body (41) and a sliding rod (42) integrally formed with the main body (41), and the sliding rod (42) can slide in the slide groove (9), and the sliding rod (42) and the connecting rod (7) are fixed by the fixing assembly (8).

2. The adjustable acromion osteotome according to claim 1, characterized in that: The cutter head (4) and the cutter rod (2) are detachably connected.

3. The adjustable acromion osteotome according to claim 1, characterized in that: A plurality of slots (11) are processed on the side walls on both sides of the slide groove (9), and the slots (11) on each side wall are spaced apart along the opening direction of the slide groove (9). The slots (11) on the two side walls are symmetrically distributed about the central axis of the slide groove (9). The two sides of the cutter head (4) are respectively provided with shifting teeth (12), and when the cutter head (4) slides along the slide groove (9), the two shifting teeth (12) are respectively in contact with the slots (11) on both sides.

4. The adjustable acromion osteotome according to claim 3, characterized in that: It also includes a limit spring (13), one end of the shifting tooth (12) is rotatably connected to the cutter head (4), two limit springs (13) are provided and the two limit springs (13) are respectively located on both sides of the shifting tooth (12), and the two ends of the limit spring (13) are respectively connected to the shifting tooth (12) and the cutter head (4).

5. The adjustable acromion osteotome according to claim 1, characterized in that: The fixing assembly (8) comprises a screw rod (81) and a fastening nut (82), wherein the screw rod (81) is connected to the cutter head (4), and a slideway (10) is provided on the connecting rod (7), wherein the slideway (10) is connected to the slide groove (9), and the width of the slideway (10) is equal to the diameter of the screw rod (81).

6. The adjustable acromion osteotome according to claim 1, characterized in that: It also includes an interface (14), which is connected to the inner wall of the cavity (5), and the end of the interface (14) away from the positioning sleeve (3) can be connected to an external suction device, so that bone can enter the suction device through the positioning sleeve (3) and the interface (14) in sequence.

7. The adjustable acromion osteotome according to claim 6, characterized in that: The interface (14) is detachably connected to the cavity (5).

8. The adjustable acromion osteotome according to claim 1, characterized in that: One end of the positioning sleeve (3) close to the knife handle (1) is aligned with the zero mark of the scale line (6).

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