Cutter tube stretching and retracting control mechanism and medical cutter

Abstract

The utility model discloses a knife tube telescoping control mechanism and a medical knife, the medical knife comprises an inner knife tube and an outer knife tube sleeved outside the inner knife tube, the knife tube telescoping control mechanism comprises a support handle, one end of the inner knife tube extends into the support handle and is fixedly connected with the support handle; one end of the adjusting assembly is connected with the supporting handle and can move in the axial direction relative to the supporting handle, the other end of the adjusting assembly is in driving connection with one end of the outer cutter tube, and the outer cutter tube is driven to move in the axial direction of the inner cutter tube through axial movement of the adjusting assembly. According to the technical scheme, the manufacturing difficulty of the knife tube telescopic control mechanism is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a knife tube telescopic control mechanism and a medical knife. Background Art

[0002] In orthopedic surgery, it is often necessary to grind or drill bone tissue, but when the surgical site is deep or the surgical angle is relatively complex, the direction of the blade head needs to be changeable to facilitate surgical operations. Medical knives with variable blade heads generally include an inner blade shaft, an inner blade tube, an outer blade tube, a blade head, and a change-direction tube. The inner blade shaft and the blade head are connected and transmit torque by rotation. The inner blade tube is arranged between the inner blade shaft and the outer blade tube, and is rotationally connected to the change-direction tube. A telescopic adjustment mechanism is also arranged on the handle. The inner blade tube is driven to move forward and backward by the telescopic adjustment mechanism, and the inner blade tube drives the change-direction tube to rotate, and the change-direction tube drives the internal blade head to change direction.

[0003] An existing telescopic adjustment structure includes a support seat, an adjusting screw sleeve and a transmission component. The support seat is fixedly sleeved on an outer knife tube. The adjusting screw sleeve can be rotatably arranged on the support seat along its own axis and is located on the periphery of the outer knife tube. The adjusting screw sleeve and the support seat are relatively fixed axially. The transmission component is circumferentially fixed and axially movably arranged in the outer knife tube and connected to the inner knife tube. A window is opened on the outer knife tube. The transmission component extends out of the window and cooperates with the adjusting screw sleeve thread, so that the adjusting screw sleeve drives the inner knife tube to move through the transmission component.

[0004] However, this telescopic adjustment structure has many parts and a complex structure, which makes it difficult to manufacture and assemble. Utility Model Content

[0005] The main purpose of the utility model is to provide a knife tube telescopic control mechanism, aiming to reduce the manufacturing difficulty of the knife tube telescopic control mechanism.

[0006] To achieve the above-mentioned purpose, the knife tube telescopic control mechanism proposed in the utility model is applied to a medical knife, wherein the medical knife comprises an inner knife tube and an outer knife tube outermostly disposed on the inner knife tube, and the knife tube telescopic control mechanism comprises:

[0007] A support handle, one end of the inner knife tube extends into the support handle and is fixedly connected to the support handle;

[0008] An adjusting component, one end of which is connected to the support handle and is axially movable relative to the support handle, and the other end of which is drivingly connected to one end of the outer knife tube, so that the outer knife tube is driven to move axially along the inner knife tube through the axial movement of the adjusting component.

[0009] Optionally, the adjustment component includes:

[0010] an adjusting sleeve, one end of which is threadedly sleeved with the support handle, and the other end of which is sleeved on the outer knife tube; and

[0011] A limiting connection structure is arranged at one end of the adjusting sleeve away from the supporting handle, and is used for limiting the connection between the adjusting sleeve and the outer knife tube. The adjusting sleeve drives the outer knife tube to move axially along the inner knife tube through the limiting connection structure.

[0012] Optionally, the limiting connection structure is a limiting protrusion or a limiting groove, the outer wall of the outer knife tube is provided with a limiting groove or a limiting protrusion matching the limiting protrusion or the limiting groove, and the limiting protrusion cooperates with the limiting groove so that the adjustment sleeve drives the outer knife tube to move axially.

[0013] Optionally, the limiting groove is provided on the outer wall of the outer knife tube, and the outer knife tube comprises:

[0014] A tube body, sleeved on the outside of the inner knife tube; and

[0015] A limiting sleeve is fixed to the outer wall of the tube body. Two limiting sleeves are provided. The two limiting sleeves are spaced apart along the axial direction of the outer knife tube. The outer wall of the tube body and the two limiting sleeves together surround and form the limiting groove.

[0016] Optionally, the adjustment component includes:

[0017] A first sleeve body, provided with a first channel and a second channel connected to each other, the first sleeve body is sleeved on the outside of the support handle through the first channel, and the inner wall of the first channel is threadedly connected to the outer wall of the support handle; and

[0018] The second sleeve is sleeved on the inner wall of the second channel, the inner wall of the second sleeve is provided with a limiting protrusion, the outer wall of the outer knife tube is provided with a limiting groove, the limiting protrusion cooperates with the limiting groove so that the second sleeve drives the outer knife tube to move axially.

[0019] Optionally, the first sleeve is made of plastic or rubber; and / or,

[0020] The second sleeve is made of metal.

[0021] Optionally, the inner diameter of the first channel is larger than the inner diameter of the second channel to form a step structure at the connection between the first channel and the second channel, and the step structure abuts against the support handle to prevent the outer knife tube from moving toward the support handle.

[0022] Optionally, the knife tube extension and retraction control mechanism further includes a damping member, wherein the damping member is disposed between the adjustment component and the support handle to increase the friction resistance when the adjustment component and the support handle move relative to each other.

[0023] Optionally, a hand-tightening structure is provided at one end of the adjustment component away from the support handle, and the hand-tightening structure is protruding from the outer wall of the adjustment component; and / or,

[0024] The outer wall of the adjusting component is provided with an anti-slip structure.

[0025] The utility model also provides a medical knife, comprising the above-mentioned knife tube telescopic control mechanism, an inner knife tube and an outer knife tube outermostly disposed on the inner knife tube, wherein the axial telescopic movement of the outer knife tube relative to the inner knife tube is controlled by the telescopic control mechanism.

[0026] The knife tube telescopic control mechanism in a technical solution of an embodiment of the utility model is applied to a medical knife. The medical knife includes an inner knife tube and an outer knife tube that is sleeved on the inner knife tube. The knife tube telescopic control mechanism includes a support handle and an adjustment component. The inner knife tube is fixed to the support handle, and the outer knife tube is movably sleeved on the outside of the inner knife tube, so that the outer knife tube can move along the extension direction of the inner knife tube (i.e., the axial direction of the inner knife tube). One end of the adjustment component is connected to the support handle, and the other end of the adjustment component is driven to connect the outer knife tube. One end of the adjustment component can move axially relative to the support handle, thereby driving the outer knife tube to move axially along the inner knife tube. The inner knife tube located on the inner side is fixed, and the outer knife tube located on the outer side can move. The outermost outer knife tube is driven to move by the adjustment component. The number of parts of the entire knife tube telescopic control mechanism is small, the support handle and the adjustment component are simple in structure, and the difficulty of manufacturing and assembly is low, thereby reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 A cross-sectional view of an embodiment of the knife tube telescopic control mechanism of the utility model Figure 1 ;

[0029] Figure 2 A cross-sectional view of an embodiment of the knife tube telescopic control mechanism of the utility model Figure 2 ;

[0030] Figure 3 It is a cross-sectional view of the outer knife tube of the knife tube telescopic control mechanism of the utility model;

[0031] Figure 4 It is a cross-sectional view of an adjustment sleeve of an adjustment assembly of a knife tube telescopic control mechanism of the utility model;

[0032] Figure 5 It is a cross-sectional view of a first sleeve body of an adjusting sleeve of an adjusting assembly of a knife tube telescopic control mechanism of the utility model;

[0033] Figure 6 It is a structural schematic diagram of the adjustment component of the knife tube telescopic control mechanism of the utility model;

[0034] Figure 7 It is a cross-sectional view of an embodiment of the medical knife of the utility model.

[0035] Description of Figure Numbers:

[0036] Label name Label name 100 Support handle 200 Inner knife tube 300 Outer knife tube 310 tube body 320 Limit sleeve 400 Adjustment components 410 Adjustment sleeve 411 The first set 4111 First Channel 4112 Second channel 4113 Step structure 4114 Hand-tightening structure 4115 Anti-slip structure 412 The second body 420 Limit connection structure 421 Limiting protrusion 422 Limit groove 500 Damping parts 600 Segment 700 Inner tool bar 800 Direction changer

[0037] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0042] The utility model provides a knife tube telescopic control mechanism.

[0043] Reference Figure 1 to Figure 2 , Figure 1 A cross-sectional view of an embodiment of the knife tube telescopic control mechanism of the utility model Figure 1 , Figure 2 A cross-sectional view of an embodiment of the knife tube telescopic control mechanism of the utility model Figure 2 .

[0044] In an embodiment of the utility model, the knife tube telescopic control mechanism is applied to a medical knife, the medical knife comprises an inner knife tube 200 and an outer knife tube 300 which is outer-mounted on the inner knife tube 200, and the knife tube telescopic control mechanism comprises:

[0045] The support handle 100, one end of the inner blade tube 200 extends into the support handle 100 and is fixedly connected to the support handle 100;

[0046] The adjusting component 400 has one end connected to the supporting handle 100 and is axially movable relative to the supporting handle 100, and the other end of the adjusting component 400 is drivingly connected to one end of the outer knife tube 300, and the outer knife tube 300 is driven to move axially along the inner knife tube 200 through the adjusting component 400.

[0047] The knife tube telescopic control mechanism in a technical solution of an embodiment of the utility model is applied to a medical knife, which includes an inner knife tube 200 and an outer knife tube 300 which is sleeved on the inner knife tube 200, and the knife tube telescopic control mechanism includes a support handle 100 and an adjustment component 400, wherein the inner knife tube 200 is fixed to the support handle 100, and the outer knife tube 300 is movably sleeved on the outside of the inner knife tube 200, so that the outer knife tube 300 can move along the extension direction of the inner knife tube 200 (i.e., the axial direction of the inner knife tube 200). One end of the adjustment component 400 is connected to the support handle 100, and the other end of the adjustment component 400 is drivingly connected to the outer knife tube 300, and one end of the adjustment component 400 can move axially relative to the support handle 100, thereby driving the outer knife tube 300 to move along the axial direction of the inner knife tube 200. The inner knife tube 200 located on the inner side is fixed, and the outer knife tube 300 located on the outer side is movable. The outermost outer knife tube 300 is driven to move by the adjustment component 400. The entire knife tube telescopic control mechanism has a small number of parts, the support handle 100 and the adjustment component 400 have a simple structure, and the difficulty of manufacturing and assembly is relatively low, thereby reducing the manufacturing cost.

[0048] One end of the adjustment component 400 is connected to the support handle 100 and is axially movable relative to the support handle 100. The adjustment component 400 and the support handle 100 can be directly threadedly connected, or can be realized by the cooperation of a spiral groove and a ball. Specifically in this embodiment, the adjustment component 400 and the support handle 100 are threadedly connected. On the one hand, the position of the outer knife tube 300 is adjusted steplessly, so that the extension amount of the outer knife tube 300 relative to the inner knife tube 200 is more flexible; on the other hand, the threaded connection has a high precision, thereby improving the positioning accuracy of the outer knife tube 300 when moving and the repeated positioning accuracy of multiple movements; on the other hand, it is relatively simple to drive the outer knife tube 300 to move linearly by rotating the adjustment component 400, while it is very difficult to cause the adjustment component 400 to rotate by the linear movement of the outer knife tube 300, which enables the outer knife tube 300 to stay at any position within the effective moving range and has a certain self-locking effect, thereby improving the convenience of the knife tube extension control mechanism.

[0049] In another embodiment, the adjustment component 400 and the support handle 100 may also be connected by an elastic buckle, and the expansion and contraction amount of the outer blade tube 300 relative to the inner blade tube 200 may be adjusted step by step by the elastic buckle.

[0050] Optionally, the adjustment component 400 includes:

[0051] An adjusting sleeve 410, one end of which is threadedly sleeved with the support handle 100, and the other end of which is sleeved on the outer blade tube 300; and

[0052] The limiting connection structure 420 is arranged at one end of the adjustment sleeve 410 away from the support handle 100 and is used to limit the connection between the adjustment sleeve 410 and the outer knife tube 300. The adjustment sleeve 410 drives the outer knife tube 300 to move axially along the inner knife tube 200 through the limiting connection structure 420.

[0053] In this embodiment, the adjustment assembly 400 includes an adjustment sleeve 410 and a position limiting connection structure 420. One end of the adjustment sleeve 410 is threadedly sleeved with the support handle 100. The adjustment sleeve 410 can be sleeved on the outside of the support handle 100 and threadedly connected to the outer wall of the support handle 100, or the support handle 100 can be sleeved on the outside of the adjustment sleeve 410 and threadedly connected to the outer wall of the adjustment sleeve 410. The position limiting connection structure 420 connects the other end of the adjustment sleeve 410 and the outer wall of the outer knife tube 300. The movement of the adjustment sleeve 410 is transmitted to the outer knife tube 300 through the position limiting connection structure 420, so that the axial movement control of the outer knife tube 300 by the adjustment sleeve 410 is realized. The position-limiting connection structure 420 may be a connection pin, which is inserted through the outer knife tube 300 and the adjustment sleeve 410. When the adjustment sleeve 410 moves along the spiral thread, the outer knife tube 300 is driven to move through the connection pin, so that the outer knife tube 300 moves along the axial direction of the inner knife tube 200. The position-limiting connection structure 420 may also be a combination of a protrusion and a groove, for example, a protrusion is provided on the adjustment sleeve 410, and a groove is provided on the outer wall of the outer knife tube 300 corresponding to the protrusion. After the adjustment sleeve 410 and the outer knife tube 300 are assembled, the protrusion is inserted into the groove. When the adjustment sleeve 410 moves along the spiral thread, the protrusion follows the adjustment sleeve 410 to move spirally, driving the outer knife tube 300 to move along the axial direction of the inner knife tube 200. The second end of the adjustment sleeve 410 is sleeved on the outside of the outer knife tube 300, so that the adjustment sleeve 410 plays a certain supporting role on the outer knife tube 300. When the outer knife tube 300 is driven by the adjustment sleeve 410 to move, the force is more uniform and the movement is more stable.

[0054] Optionally, the limiting connection structure 420 is a limiting protrusion 421 or a limiting groove 422, and the outer wall of the outer knife tube 300 is provided with a limiting groove 422 or a limiting protrusion 421 matching the limiting protrusion 421 or the limiting groove 422, and the limiting protrusion 421 cooperates with the limiting groove 422 to enable the adjustment sleeve 410 to drive the outer knife tube 300 to move axially.

[0055] Please combine Figures 1 to 4In this embodiment, the limiting connection structure 420 includes a limiting protrusion 421 and a limiting groove 422. The limiting protrusion 421 can be provided on the outer wall of the outer knife tube 300, and the limiting groove 422 can be provided on the adjusting sleeve 410 accordingly; or the limiting groove 422 can be provided on the outer wall of the outer knife tube 300, and the limiting protrusion 421 can be provided on the adjusting sleeve 410 accordingly. By inserting the limiting protrusion 421 into the limiting groove 422, the adjusting sleeve 410 drives the outer knife tube 300 to move. The structure is simple and the fit is tight. The adjusting sleeve 410 and the outer knife tube 300 are not easy to separate, which ensures the reliability of the adjusting sleeve 410 driving the outer knife tube 300 to move.

[0056] Optionally, the limiting groove 422 is provided on the outer wall of the outer knife tube 300, and the outer knife tube 300 includes:

[0057] The tube body 310 is sleeved on the outer portion of the inner blade tube 200; and

[0058] The limiting sleeve 320 is fixed to the outer wall of the tube body 310 . Two limiting sleeves 320 are provided. The two limiting sleeves 320 are spaced apart along the axial direction of the outer knife tube 300 . The outer wall of the tube body 310 and the two limiting sleeves 320 together surround and form a limiting groove 422 .

[0059] Reference Figure 3 In this embodiment, a limiting groove 422 is provided on the outer knife tube 300, and the outer knife tube 300 includes a tube body 310 and a limiting sleeve 320. Two limiting sleeves 320 are provided on the outer wall of the tube body 310. Along the axial direction of the inner knife tube 200, there is a gap between the two limiting sleeves 320, and a limiting protrusion 421 provided on the adjusting sleeve 410 is inserted into the gap. When the adjusting sleeve 410 moves in a forward spiral direction, the limiting protrusion 421 pushes one of the limiting sleeves 320 to drive the tube body 310 to move. When the adjusting sleeve 410 moves in a reverse spiral direction, the limiting protrusion 421 pushes the other limiting sleeve 320 to drive the tube body 310 to move. The structure is simple, easy to implement, and has low manufacturing cost. Specifically in this embodiment, the limit sleeve 320 has a tubular structure with a simple structure. During the spiral movement of the adjustment sleeve 410, the tubular structure is conducive to ensuring the continuity of the adjustment sleeve 410 pushing the limit sleeve 320 to move, thereby ensuring the smooth movement of the outer knife tube 300, and making the assembly between the limit sleeve 320 and the tube body 310 more convenient and the connection more tightly.

[0060] Optionally, the adjustment component 400 includes:

[0061] The first sleeve 411 is provided with a first channel 4111 and a second channel 4112 which are connected to each other. The first sleeve 411 is sleeved on the outside of the support handle 100 through the first channel 4111. The inner wall of the first channel 4111 is threadedly connected to the outer wall of the support handle 100.

[0062] The second sleeve 412 is sleeved on the inner wall of the second channel 4112. The inner wall of the second sleeve 412 is provided with a limiting protrusion 421, and the outer wall of the outer knife tube 300 is provided with a limiting groove 422. The limiting protrusion 421 cooperates with the limiting groove 422 to enable the second sleeve 412 to drive the outer knife tube 300 to move axially.

[0063] Reference Figures 4 to 5 In this embodiment, the adjustment assembly 400 includes a first sleeve 411 and a second sleeve 412. The second sleeve 412 is connected to the inner wall of the second channel 4112 of the first sleeve 411, so that the first sleeve 411 drives the second sleeve 412 to move spirally when the first sleeve 411 moves spirally. The first sleeve 411 is threadedly connected to the support handle 100, and the second sleeve 412 drives the outer knife tube 300 through the limiting connection structure 420. By setting the adjustment assembly 400 in a split body, the processing difficulty of the adjustment assembly 400 is reduced, the manufacturing efficiency is improved, and the production cost is reduced.

[0064] Optionally, the first housing 411 is made of plastic or rubber; and / or,

[0065] The second housing 412 is made of metal.

[0066] In this embodiment, the first sleeve 411 can be made of plastic material or rubber material, which is easy to shape and has low material cost. On the other hand, when the adjustment sleeve 410 is rotated, the user's hand contacts the first sleeve 411, and the friction between the first sleeve 411 made of plastic or rubber and the hand is relatively large, which makes the user's operation more labor-saving.

[0067] In the present embodiment, since the second sleeve 412 needs to drive the outer knife tube 300 to move, the limiting protrusion 421, the second sleeve 412, and the connection between the limiting protrusion 421 and the second sleeve 412 all have higher strength requirements. Therefore, in the present embodiment, the second sleeve 412 is made of metal material, and the limiting protrusion 421 and the second sleeve 412 are integrally formed, and the limiting protrusion 421 is directly processed and formed on the second sleeve 412, thereby ensuring the reliability of the second sleeve 412 and the limiting protrusion 421 during use, reducing the possibility of damage to the adjustment component 400, and extending the service life of the adjustment component 400.

[0068] Specifically in this embodiment, the support handle 100 includes a first handle body and a second handle body, the first handle body is sleeved on the outer periphery of the second handle body, the first handle body is threadedly connected to the first sleeve 411, and the inner knife tube 200 is fixed to the second handle body, wherein the first handle body is made of plastic or rubber material to reduce the manufacturing cost of the support handle 100, and the second handle body is made of metal material to ensure the strength of the second handle body and the inner knife tube 200.

[0069] Optionally, the inner diameter of the first channel 4111 is greater than the inner diameter of the second channel 4112 to form a step structure 4113 at the connection between the first channel 4111 and the second channel 4112, and the step structure 4113 abuts against the support handle 100 to prevent the outer knife tube 300 from moving toward the support handle 100.

[0070] Reference Figure 1 , Figure 2 and Figure 5 In this embodiment, the inner diameter of the first channel 4111 is greater than the inner diameter of the second channel 4112, so that a step structure 4113 is formed at the connection between the first channel 4111 and the second channel 4112. When the adjusting sleeve 410 moves toward the direction close to the support handle 100, the step structure 4113 will abut against the support handle 100, thereby limiting the adjusting sleeve 410, that is, limiting the external knife tube 300, and can also prevent the adjusting sleeve 410 from moving too far in this direction, thereby reducing the possibility of damage to the thread between the adjusting sleeve 410 and the support handle 100.

[0071] Optionally, the knife tube extension and retraction control mechanism further includes a damping member 500, which is disposed between the adjustment assembly 400 and the support handle 100 to increase the friction resistance when the adjustment assembly 400 and the support handle 100 move relative to each other.

[0072] Reference Figure 1 In this embodiment, a damping member 500 is further provided between the first sleeve 411 and the support handle 100. The damping member 500 is made of an elastic material, such as rubber or polyurethane. The provision of the damping member 500 increases the friction resistance of the first sleeve 411 and the support handle 100 during relative rotation, so that the user needs to apply greater force when rotating the adjustment sleeve 410, which makes the adjustment sleeve 410 unable to rotate quickly, thereby reducing the speed of extension and retraction of the outer knife tube 300 and improving the stability of the extension and retraction of the outer knife tube 300. In addition, the reaction force applied to the user's hand by the adjustment sleeve 410 during the rotation process is also relatively large, so that the user can easily know clearly whether he has rotated the adjustment sleeve 410 through the hand feeling, thereby improving the convenience of the knife tube extension and retraction control mechanism during use; on the other hand, it makes it more difficult for the adjustment component 400 to rotate due to the movement of the outer knife tube 300, which makes the outer knife tube 300 have a better self-locking effect when it stops at any position within the effective moving range, further improving the convenience of the knife tube extension and retraction control mechanism. Specifically in this embodiment, a mounting groove can be provided on the inner wall of the first sleeve 411 facing the support handle 100, or a mounting groove can be provided on the outer wall of the support handle 100 facing the first sleeve 411, and the damping member 500 is partially provided in the mounting groove.

[0073] Optionally, a hand-tightening structure 4114 is provided at one end of the adjustment component 400 away from the support handle 100, and the hand-tightening structure 4114 is protruded from the outer wall of the adjustment component 400; and / or,

[0074] The outer wall of the adjustment component 400 is provided with an anti-slip structure 4115 .

[0075] Reference Figure 6 In this embodiment, a hand-tightening structure 4114 is further provided at one end of the first sleeve 411 away from the support handle 100. The hand-tightening structure 4114 protrudes from the outer wall of the first sleeve 411. A protrusion or a groove can be provided on the hand-tightening structure 4114 to facilitate the user's hand operation to rotate the adjustment sleeve 410, thereby improving the ease of use of the adjustment assembly 400.

[0076] Reference Figure 6 In this embodiment, an anti-skid structure 4115 is provided on the outer wall of the first sleeve 411. The anti-skid structure 4115 can be in the form of a protrusion or a groove. The anti-skid structure 4115 can increase the friction between the first sleeve 411 and the user's hand, making it more convenient for the user to rotate the adjustment sleeve 410. Specifically in this embodiment, the first sleeve 411 is made of rubber or plastic, and the hand-tightening structure 4114 or the anti-skid structure 4115 is easier to shape and has a low manufacturing cost.

[0077] The utility model also provides a medical knife, including the above-mentioned knife tube telescopic control mechanism, as well as an inner knife tube 200 and an outer knife tube 300 outerly disposed on the inner knife tube 200, and the axial telescopic movement of the outer knife tube 300 relative to the inner knife tube 200 is controlled by the telescopic control mechanism.

[0078] The specific structure of the knife tube telescopic control mechanism refers to the above embodiment. Since the medical knife adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Figure 7The medical knife also includes a knife head 600, an inner knife rod 700 and a direction-changing member 800. The inner knife rod 700 is drivingly connected to the knife head 600 to drive the knife head 600 to rotate and make the direction of the knife head 600 adjustable. The inner knife tube 200 is sleeved on the outside of the inner knife rod 700, and the direction-changing member 800 is sleeved on the outside of the knife head 600. The direction-changing member 800 has a first connecting portion and a second connecting portion. The first connecting portion is rotatably connected to the outer knife tube 300, and the second connecting portion is rotatably connected to the inner knife tube 200. The outer knife tube 300 is driven by the adjusting component 400 to slide axially, and the sliding of the outer knife tube 300 drives the direction-changing member 800 to rotate around the second connecting portion, thereby adjusting the direction of the knife head 600 inside the direction-changing member 800. The inner blade rod 700 drives the blade head 600 to rotate, the inner blade tube 200 located between the inner blade rod 700 and the outer blade tube 300 is fixed, and the outermost outer blade tube 300 slides to realize the direction change of the blade head 600. The structure is simple and the manufacturing difficulty is low.

[0079] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A knife tube extension and retraction control mechanism, applied to a medical knife, the medical knife comprising an inner knife tube and an outer knife tube outermostly disposed on the inner knife tube, characterized in that: The knife tube telescopic control mechanism comprises: A support handle, one end of the inner knife tube extends into the support handle and is fixedly connected to the support handle; An adjusting component, one end of which is connected to the support handle and is axially movable relative to the support handle, and the other end of which is drivingly connected to one end of the outer knife tube, so that the outer knife tube is driven to move axially along the inner knife tube through the axial movement of the adjusting component.

2. The knife tube extension and retraction control mechanism according to claim 1, characterized in that: The adjustment component comprises: an adjusting sleeve, one end of which is threadedly sleeved with the support handle, and the other end of which is sleeved on the outer knife tube; and A limiting connection structure is arranged at one end of the adjusting sleeve away from the supporting handle, and is used for limiting the connection between the adjusting sleeve and the outer knife tube. The adjusting sleeve drives the outer knife tube to move axially along the inner knife tube through the limiting connection structure.

3. The knife tube extension and retraction control mechanism according to claim 2, characterized in that: The limiting connection structure is a limiting protrusion or a limiting groove, and the outer wall of the outer knife tube is provided with a limiting groove or a limiting protrusion matching the limiting protrusion or the limiting groove, and the limiting protrusion cooperates with the limiting groove to enable the adjustment sleeve to drive the outer knife tube to move axially.

4. The knife tube extension and retraction control mechanism according to claim 3, characterized in that: The limiting groove is arranged on the outer wall of the outer knife tube, and the outer knife tube comprises: A tube body, sleeved on the outside of the inner knife tube; and A limiting sleeve is fixed to the outer wall of the tube body. Two limiting sleeves are provided. The two limiting sleeves are spaced apart along the axial direction of the outer knife tube. The outer wall of the tube body and the two limiting sleeves together surround and form the limiting groove.

5. The knife tube extension and retraction control mechanism according to claim 1, characterized in that: The adjustment component comprises: A first sleeve body, provided with a first channel and a second channel connected to each other, the first sleeve body is sleeved on the outside of the support handle through the first channel, and the inner wall of the first channel is threadedly connected to the outer wall of the support handle; and The second sleeve is sleeved on the inner wall of the second channel, the inner wall of the second sleeve is provided with a limiting protrusion, the outer wall of the outer knife tube is provided with a limiting groove, the limiting protrusion cooperates with the limiting groove so that the second sleeve drives the outer knife tube to move axially.

6. The knife tube extension and retraction control mechanism according to claim 5, characterized in that: The first housing is made of plastic or rubber; and / or, The second sleeve is made of metal.

7. The knife tube extension and retraction control mechanism according to claim 5, characterized in that: The inner diameter of the first channel is greater than the inner diameter of the second channel to form a step structure at the connection between the first channel and the second channel, and the step structure abuts against the support handle to prevent the outer knife tube from moving toward the support handle.

8. The knife tube extension and retraction control mechanism according to any one of claims 1 to 7, characterized in that: The knife tube extension and retraction control mechanism also includes a damping member, which is arranged between the adjustment component and the support handle to increase the friction resistance when the adjustment component and the support handle move relative to each other.

9. The knife tube extension and retraction control mechanism according to claim 8, characterized in that: The end of the adjustment component away from the support handle is provided with a hand-tightening structure, and the hand-tightening structure is protruding from the outer wall of the adjustment component; and / or, The outer wall of the adjusting component is provided with an anti-slip structure.

10. A medical knife, characterized in that: It comprises a knife tube telescopic control mechanism as described in any one of claims 1 to 9, and an inner knife tube and an outer knife tube outermost therein, wherein the axial telescopic movement of the outer knife tube relative to the inner knife tube is controlled by the telescopic control mechanism.

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