Trephine with depth limiting function

Abstract

The trephine with the depth limiting function comprises a shell, a trephine body, a depth limiting piece and an adjusting sleeve, sawteeth are annularly arranged on the end face of the front end of the trephine body, and the rear end of the trephine body is arranged in the shell in a penetrating mode; the depth limiting piece is arranged on the shell or the trephine body in an axial moving mode. The adjusting sleeve is in transmission connection with the depth limiting piece through a transmission mechanism so that the depth limiting piece can move or be stopped in the axial direction. When the trephine with the depth limiting function is used, the adjusting sleeve is rotated to drive the depth limiting piece to move front and back, and the depth limiting piece is matched with other instruments to move, so that the cutting depth is accurately controlled, the operation difficulty in the operation process of a surgeon is reduced, nerves and necessary sclerotin are protected, and pain stimulation to a patient is relieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical technology field especially, and it is a kind of ring saw with depth function. BACKGROUND

[0002] Current market for operation ring saw has manual ring saw and electric ring saw, manual ring saw is rotated by medical staff with hand, and electric ring saw is rotated by motor drive driving member, and driving member drives ring saw connected with it to rotate to complete cutting. However, when operating ring saw, because ring saw has no depth function, it is easy to damage spinal cord nerve due to excessive force, unnecessary damage is caused to cutting position, and the safety of cutting cannot be guaranteed. SUMMARY

[0003] Therefore, it is necessary to provide a kind of ring saw with depth function for the safety problem of existing ring saw, to reduce the operation difficulty of surgeon in surgical process, guarantee the safety of operation.

[0004] A kind of ring saw with depth function, comprising:

[0005] Shell;

[0006] Ring saw body, the ring saw body front end end surface is equipped with sawtooth, rear end is arranged in the shell;

[0007] Depth limiting piece, the depth limiting piece is axially movably arranged on the shell or the ring saw body;

[0008] Adjusting sleeve, the adjusting sleeve is driven connection on the depth limiting piece by transmission mechanism, to make the depth limiting piece move or stop along the axial direction.

[0009] In one embodiment, it further includes driving member, the driving member part is arranged in the shell and is connected with the ring saw body, and the ring saw body is driven to rotate by the driving member.

[0010] In one embodiment, the ring saw body includes outer cutter tube and inner cutter tube, the outer cutter tube is fixedly connected with the shell by extending into the shell, the inner cutter tube is sleeved on the outer cutter tube, and one end of the inner cutter tube is connected with the driving member, and the other end end surface is equipped with the sawtooth, and the depth limiting piece is sleeved on the outer cutter tube.

[0011] In one embodiment, the shell includes connected front section and rear section, the depth limiting piece is sleeved on the front section, and can be axially moved relative to the shell by the transmission of the adjusting sleeve.

[0012] In one of the embodiments, the front end of the depth limiter is provided with a stopper extending radially inwardly to form a boss, which cooperates with the end face of the front section of the housing to limit the distance of the backward movement of the depth limiter.

[0013] In one of the embodiments, the outer diameter of the front section is smaller than that of the rear section.

[0014] In one of the embodiments, the transmission mechanism comprises a sliding member arranged on one of the depth limiter and the adjusting sleeve, and a helical groove arranged on the other and cooperating with the sliding member, the sliding member being slidable in the helical groove, and the depth limiter being axially moved relative to the adjusting sleeve.

[0015] In one of the embodiments, the housing is provided with an elastically stretchable impact member, and the inner wall of the adjusting sleeve is provided with a plurality of recesses arranged in the circumferential direction, the impact member sliding into the recesses and impacting the inner wall of the recesses when the adjusting sleeve rotates.

[0016] In one of the embodiments, the outer surface of the housing is provided with a plurality of scales arranged in the circumferential direction.

[0017] In one of the embodiments, the first and second limiting sleeves are arranged at the two ends of the adjusting sleeve to limit the axial movement of the adjusting sleeve.

[0018] The ring saw with the depth limiting function has the advantages that, during use, the depth limiter is moved forward and backward by operating the adjusting sleeve, and the depth limiter cooperates with other instruments (such as an endoscope) to realize accurate control of the cutting depth, reduce the operation difficulty of the surgeon during the operation, protect the nerves and necessary bone mass, and reduce the pain stimulation to the patient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view of the ring saw with the depth limiting function in one of the embodiments of the utility model;

[0020] Figure 2 It is a sectional view along Figure 1 the line B-B in FIG. 1;

[0021] Figure 3 It is an enlarged schematic view of the part A in FIG. 1; Figure 2

[0022] Figure 4 It is an enlarged schematic view of the part B in FIG. 1; Figure 2

[0023] Figure 5 Figure 2 ​​​A partial enlarged view at C;

[0024] Figure 6 For Figure 2 A partial enlarged view at D.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 10, housing; 11, housing main body; 111, front section; 112, rear section; 12, outer cover; 12a, plug portion;

[0027] 20, outer ring saw assembly; 21, outer ring saw head; 21a, outer saw tooth; 22, outer knife tube; 23, outer ring saw handle; 23a, strip-shaped groove; 24, first bearing;

[0028] 30, inner ring saw assembly; 31, inner ring saw head; 21a, outer saw tooth; 32, inner knife tube; 33, inner ring saw handle; 33a, mounting column;

[0029] 40, driving member; 41, connecting interface; 42, transmission groove; 43, mounting hole; 44, second bearing;

[0030] 50, transmission pin;

[0031] 60, elastic member;

[0032] 71, depth limiter; 71a, stop portion; 71b, boss; 72, adjusting sleeve; 72a, helical groove; 73, sliding member; 74, impact member; 75, first limiting sleeve; 76, second limiting sleeve. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, clear and understandable, the specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the specific details described below are only part of the embodiments of the present application, and the present application can also be implemented in many other embodiments different from those described herein. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the protection scope of the present application.

[0034] In this document, when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "front," "back," "upper," "lower," and the like are used herein for clarity in describing the technical solutions and are not intended to limit the scope of the present application. It should be understood that the use of these terms should not limit the scope of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0036] Referring to Figure 1 , 2 , 5, the ring saw with depth limiting function in one embodiment of the present application comprises a shell 10, a ring saw body, a depth limiting piece 71 and an adjusting sleeve 72. The ring saw body as an example comprises an inner ring saw assembly 30 and an outer ring saw assembly 20. The rear end of the outer ring saw assembly 20 is rotatably installed in the front end of the shell 10. The end face of the front end is provided with a plurality of outer saw teeth 21a arranged in the circumferential direction. The inner ring saw assembly 30 is located inside the outer ring saw assembly 20 and can rotate and axially move relative to the outer ring saw assembly 20. The front end of the inner ring saw assembly 30 protrudes out of the outer ring saw assembly 20. The end face of the front end is provided with a plurality of inner saw teeth 31a arranged in the circumferential direction. The depth limiting piece 71 is arranged on the shell 10 and can move forward and backward along the axial direction. The adjusting sleeve 72 is drivingly connected to the depth limiting piece 71 through a transmission mechanism to make the depth limiting piece 71 move or stop along the axial direction.

[0037] When the ring saw is used, the ring saw body is inserted into an instrument (such as an endoscope, not shown in the figure). The rear end face of the instrument cooperates with the front end face of the depth limiting piece 71 to realize the depth limiting function, that is, when the front end face of the depth limiting piece 71 does not contact the rear end face of the instrument, the ring saw can continue to move forward. At this time, the outer ring saw assembly 20 and the inner ring saw assembly 30 can simultaneously perform the cutting action. The inner saw teeth 31a of the inner ring saw assembly and the outer saw teeth 21a of the outer ring saw assembly cut the tissue respectively. When the front end face of the depth limiting piece 71 contacts the rear end face of the instrument, the axial movement of the ring saw is limited, and the ring saw cannot continue to move forward, thereby realizing the limitation of the cutting depth. By adjusting the forward and backward positions of the depth limiting piece 71, the length of the ring saw body inserted into the instrument can be adjusted, thereby realizing the accurate control of the cutting depth.

[0038] As an alternative, the depth limiting piece 71 can also be directly arranged on the outer knife tube 22. The depth limiting piece 71 in this embodiment is a cylindrical structure, and the depth limiting piece 71 is sleeved on the shell 10. In addition to being a cylindrical structure, the depth limiting piece 71 can also be semicircular or strip-shaped.

[0039] In one embodiment, the ring saw with depth limiting function further comprises a driving member 40, part of which is located in the housing 10 and connected with the ring saw body, and the driving member 40 is used to drive the ring saw body to rotate. As an example, the front end of the driving member 40 is located in the rear end of the housing 10, and the driving member 40 is connected with the inner ring saw assembly 30 of the ring saw body through a clutch mechanism, and the inner ring saw assembly 30 is connected with the outer ring saw assembly 20 through a synchronous transmission mechanism. The driving member 40 provides rotating power, and the power is transmitted to the inner ring saw assembly 30 through the clutch mechanism. The synchronous transmission mechanism ensures that the inner ring saw assembly 30 and the outer ring saw assembly 20 rotate synchronously, so that the inner saw teeth 31a of the inner ring saw assembly and the outer saw teeth 21a of the outer ring saw assembly can work at the same time, and the cutting task is completed cooperatively.

[0040] In one embodiment, the housing 10 comprises a front section 111 and a rear section 112 connected in sequence, the depth limiting member 71 is sleeved on the front section 111, and can be driven to move axially relative to the housing 10 by the adjusting sleeve 72. Specifically, the adjusting sleeve 72 is sleeved on the front section 111 and can rotate relative to the housing 10. The depth limiting member 71 is located between the adjusting sleeve 72 and the front section 111, and the front end of the depth limiting member 71 protrudes from the front section 111 and the adjusting sleeve 72 and is provided with a stop portion 71a. Through the stop portion 71a, the rearward movement of the depth limiting member 71 can be limited to ensure safe operation. With this structure, the depth limiting member 71 is sleeved on the front section 111 and driven by the adjusting sleeve 72, which fully utilizes the space of the front section 111 in structure and realizes the axial depth limiting adjustment function. The precise fit between the adjusting sleeve 72 and the depth limiting member 71 makes the entire depth limiting structure occupy less space and reduces the size of the overall instrument. Preferably, a first limiting sleeve 75 and a second limiting sleeve 76 are further included, and the first limiting sleeve 75 and the second limiting sleeve 76 are respectively installed on the front section 111 on the front and rear sides of the adjusting sleeve 72. The first limiting sleeve 75 and the second limiting sleeve 76 are used to limit the movement range of the adjusting sleeve 72 to ensure smooth rotation of the adjusting sleeve 72.

[0041] In one embodiment, as shown in Figure 6 , the stop portion 71a extends inward along the radial direction of the depth limiting member 71 to form a boss 71b, and the inner side surface of the boss 71b is matched with the front end surface of the front section 111 to limit the stroke of the rearward movement of the depth limiting member 71.

[0042] In one embodiment, the transmission mechanism comprises a sliding member 73 arranged on the depth limiter 71, and a helical groove 72a arranged on the adjusting sleeve 72 and cooperating with the sliding member 73, the sliding member 73 being slidable in the helical groove 72a. Through the cooperation of the sliding member 73 and the helical groove 72a, the rotary motion of the adjusting sleeve 72 can be converted into the axial motion of the depth limiter 71. Alternatively, the positions of the helical groove 72a and the sliding member 73 are reversed, i.e. the helical groove 72a is arranged on the depth limiter 71, and the sliding member 73 is arranged on the adjusting sleeve 72. Alternatively, the transmission mechanism comprises an external thread arranged on the outer wall of the depth limiter, and an internal thread arranged on the inner wall of the adjusting sleeve 72 and cooperating with the external thread, the depth limiter and the adjusting sleeve 72 being connected through the external thread and the internal thread.

[0043] In one embodiment, the housing 10 is provided with an elastically expandable impact member 74, and the inner wall of the adjusting sleeve 72 is provided with a plurality of recesses arranged in the circumferential direction and cooperating with the impact member 74; when the adjusting sleeve 72 rotates, the impact member 74 slides into the recesses and impacts the inner wall of the recesses. Through the cooperation of the impact member 74 and the recesses, sound is generated, and the user can obtain clear sound feedback during operation, ensuring the accuracy of the adjustment.

[0044] In one embodiment, the outer surface of the depth limiter 71 is provided with a plurality of scales arranged in the circumferential direction (not shown in the figure). The scales provide intuitive depth indication, enabling the user to accurately adjust the cutting depth.

[0045] In one embodiment, the outer diameter of the front section 111 is smaller than the outer diameter of the rear section 112. This design enables the front section 111 to more flexibly install the depth limiter 71, and improves the stability of the overall structure.

[0046] The housing 10 is cylindrical and extends in the axial direction as an example, for easy gripping. The housing 10 has a front end and a rear end, and the rear end of the housing 10 is provided with a plug portion 12a that cooperates with a socket on the driving handle (not shown in the figure). As an example, the housing 10 in the present embodiment comprises a housing body 11 and a cover 12, the rear end of the housing body 11 being connected to the front end of the cover 12, and the cover 12 being provided with the plug portion 12a. The housing 10 adopts a split structure, facilitating assembly.

[0047] The outer ring saw assembly 20 comprises an outer ring saw head 21, an outer cutter tube 22 and an outer ring saw handle 23. The outer ring saw handle 23 is rotatably mounted in the housing main body 11. The outer ring saw handle 23 is rotatably mounted in the housing main body 11 through a plurality of first bearings 24 to reduce the rotating resistance. The outer cutter tube 22 is connected to the outer ring saw head 21 at the front end and connected to the outer ring saw handle 23 at the rear end. The outer ring saw head 21 is provided with a plurality of outer saw teeth 21a arranged in the circumferential direction at the front end. When the outer ring saw handle 23 rotates, the outer cutter tube 22 and the outer ring saw head 21 are driven to rotate, so that the outer saw teeth 21a cut the bone tissue.

[0048] The inner ring saw assembly 30 comprises an inner ring saw head 31, an inner cutter tube 32 and an inner ring saw handle 33. The inner ring saw handle 33 is located inside the outer ring saw handle 23. The inner cutter tube 32 is connected to the inner ring saw head 31 at the front end and connected to the inner ring saw handle 33 at the rear end. The inner ring saw head 31 is provided with a plurality of inner saw teeth 31a arranged in the circumferential direction at the front end. The front end of the inner ring saw head 31 is provided with a height difference H (see Figure 3 ) from the front end of the outer ring saw head 21. When the bone tissue is cut, the cut bone tissue forms a stepped hole, which provides support for the ring penetration. The rear end of the inner ring saw head 31 is connected to the front end of the inner ring saw handle 33. When the inner ring saw handle 33 rotates, the inner ring saw head 31 is driven to rotate, so that the inner saw teeth 31a cut the bone tissue.

[0049] In this embodiment, the driving member 40 is rotatably mounted in the housing main body 11 through a second bearing 44. The rear end of the driving member 40 extends out of the center hole of the outer cover 12. When the ring saw is mounted on the driving handle, the rear end of the driving member 40 is connected to the output end of the driving device (not shown) in the driving handle.

[0050] The front end of the driving member 40 is connected to the inner ring saw handle 33 through a clutch mechanism. The clutch mechanism comprises a first transmission part provided at the front end of the driving member 40, a second transmission part provided at the rear end of the inner ring saw handle 33 and an elastic member 60 provided between the driving member 40 and the inner ring saw handle 33. In the working state, when the inner ring saw assembly 30 moves backward relative to the outer ring saw assembly 20 under pressure, the first transmission part and the second transmission part are combined, so that the torque on the driving member 40 is transmitted to the inner ring saw handle 33, driving the inner cutter tube 32 and the inner ring saw head 31 to rotate. At the same time, the outer ring saw handle 23 is driven to rotate through the transmission pin 50, thereby driving the outer cutter tube 22 and the outer ring saw head 21 to rotate. When the drill hole is drilled, the pressure on the inner ring saw assembly 30 disappears, the first transmission part and the second transmission part are separated under the elastic force of the elastic member 60, the inner ring saw assembly 30 is disconnected from the driving member 40, and the inner ring saw assembly 30 and the outer ring saw assembly 20 stop rotating at the same time, realizing the function of ring penetration stop.

[0051] In one embodiment, the first transmission part is at least one transmission groove 42 arranged on the front end surface of the driving member 40, and the second transmission part is at least one transmission pin 50 arranged on the rear end of the inner ring saw handle 33, which cooperates with the transmission groove 42. In the working state, the transmission pin 50 is inserted into the transmission groove 42 to realize the transmission torque. When the drilling is completed, the transmission pin 50 is separated from the transmission groove 42. As an example, the transmission groove 42 is two, and the two transmission grooves 42 are oppositely arranged on the diameter line of the driving member 40. The inner ring saw handle 33 is provided with a through hole extending in the radial direction, and the transmission pin 50 is one, which is arranged in the through hole, and the two ends of the transmission pin 50 respectively extend out of the through hole.

[0052] As an example, the front end of the driving member 40 is internally provided with a mounting hole 43, the rear end of the inner ring saw handle 33 is provided with a mounting column 33a, and the elastic component 60 is a spring, which is mounted in the mounting hole 43, and the front end of the spring is sleeved on the mounting column 33a.

[0053] In one embodiment, the synchronous transmission mechanism includes a strip-shaped groove 23a extending in the axial direction arranged on the outer ring saw handle 23, and the end of the transmission pin 50 extends out of the transmission groove 42 and is inserted into the strip-shaped groove 23a. Preferably, the front end of the driving member 40 extends into the interior of the rear end of the outer ring saw handle 23. In this way, when the inner ring saw handle 33 rotates, the outer ring saw handle 23 is driven to rotate synchronously through the cooperation of the transmission pin 50 and the strip-shaped groove 23a. At the same time, the transmission pin 50 can slide forward and backward along the strip-shaped groove 23a, so that the inner ring saw handle 33 can move axially relative to the outer ring saw handle 23.

[0054] As an alternative, the depth limiter 71 is arranged on the ring saw body. Specifically, the ring saw body includes an outer cutter tube and an inner cutter tube, the outer cutter tube extends into the housing and is fixedly connected with the housing, the inner cutter tube is sleeved in the outer cutter tube, and one end of the inner cutter tube is connected with the driving member, and the other end is provided with the saw teeth on the end surface, and the depth limiter is sleeved on the outer cutter tube.

[0055] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A ring saw having a depth limiting function, characterized by, The application relates to a ring saw device. The application relates to a ring saw device. The application relates to a ring saw device. The application relates to a ring saw device. The application relates to a ring saw device.

2. Annular saw with limited depth of cut according to claim 1, characterized in that The application relates to a ring saw device.

3. Annular saw with limited depth of cut according to claim 2, characterized in that The application relates to a ring saw device.

4. The ring saw with a depth stop function according to claim 2, characterized in that, The application relates to a ring saw device.

5. Annular saw with a limited depth of cut according to claim 4, characterized in that The application relates to a ring saw device.

6. The ring saw with a depth stop function according to claim 4, characterized in that, The application relates to a ring saw device.

7. Annular saw with limited depth of cut according to any one of claims 1 to 6, characterized in that The application relates to a ring saw device.

8. Annular saw with limited depth of cut according to any one of claims 1-6, characterized in that The application relates to a ring saw device.

9. Annular saw with limited depth of cut according to any one of claims 1-6, characterized in that, The application relates to a ring saw device.

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