CN218128678U - Telescopic knife tube and medical knife - Google Patents

Abstract

The utility model relates to a scalable knife pipe and medical cutter. The telescopic knife tube is used for a medical knife, the medical knife comprises a knife head component, the knife head component comprises a connecting sleeve and a knife head, and the knife head rotatably penetrates through the connecting sleeve. The telescopic knife tube comprises an inner tube assembly, an outer tube assembly and a control tube assembly. The inner pipe assembly comprises a first inner pipe and a second inner pipe which are connected in a sliding mode, and the first inner pipe is connected with the cutter head. Outside the inner tube subassembly was located to the outer tube subassembly cover, the outer tube subassembly included sliding connection's first outer tube and second outer tube, and first outer tube is connected with the adapter sleeve. The control tube assembly is arranged between the inner tube assembly and the outer tube assembly in a penetrating mode, the control tube assembly is connected with the connecting sleeve, and the control tube assembly can move along the axial direction to drive the first inner tube to slide along the axial direction relative to the second inner tube and drive the first outer tube to slide along the axial direction relative to the second outer tube. The telescopic knife tube can adjust the axial length so as to meet the requirements of various operation scenes.

Description

Telescopic knife tube and medical knife

Technical Field

The utility model relates to the technical field of medical equipment, especially relate to a scalable knife pipe and medical cutter.

Background

With the development of medical technology, the advantages of the minimally invasive surgery, such as quick recovery after operation, etc., are gradually increased due to the small wound. In some minimally invasive surgical operations, such as spine minimally invasive surgery, cervical spine minimally invasive surgery, chest minimally invasive surgery, partial joint minimally invasive repair surgery and the like, the depth variation of the invasion amount of the cutter is large. However, the length of the cutter bar of the existing medical cutter is mostly fixed value or the axial distance of the cutter head can only be adjusted in a small way through the assembly clearance, and the requirements of various operation scenes can not be met.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a telescopic knife tube and a medical knife for adjusting the length of the medical knife.

A telescopic knife tube is used for a medical knife, the medical knife comprises a knife head component, the knife head component comprises a connecting sleeve and a knife head, and the knife head can rotatably penetrate through the connecting sleeve; its characterized in that, scalable sword pipe includes:

the inner pipe assembly comprises a first inner pipe and a second inner pipe which are connected in a sliding mode, the first inner pipe is connected with the cutter head, and the first inner pipe and the second inner pipe are used for transmitting torque to drive the cutter head to rotate;

the outer pipe assembly is sleeved outside the inner pipe assembly and comprises a first outer pipe and a second outer pipe which are connected in a sliding manner, and the first outer pipe is connected with the connecting sleeve; and the number of the first and second groups,

the control pipe assembly penetrates through the inner pipe assembly and is connected with the connecting sleeve, the control pipe assembly can move along the axial direction, so that the first inner pipe is driven to slide along the axial direction relative to the second inner pipe and the first outer pipe is driven to slide along the axial direction relative to the second outer pipe.

The technical scheme of the application is further explained as follows:

in one embodiment, the first inner tube is slidably inserted into the second inner tube, the outer periphery of the first inner tube is provided with a first groove extending along the axial direction, the inner side of the second inner tube is provided with a first convex rib extending along the axial direction, and the first convex rib is slidably arranged in the first groove

In one embodiment, the outer peripheral side of the second inner pipe is provided with a first reinforcing groove extending along the axial direction, and the position of the first reinforcing groove corresponds to the position of the first convex rib.

In one embodiment, the first outer tube is slidably inserted into the second outer tube, the outer peripheral side of the first outer tube is provided with a second groove extending in the axial direction, the inner side of the second outer tube is provided with a second rib extending in the axial direction, and the second rib is slidably arranged in the second groove.

In one embodiment, the outer peripheral side of the second outer tube is provided with a second reinforcing groove extending in the axial direction, and the position of the second reinforcing groove corresponds to the position of the second rib.

In one embodiment, the outer periphery of the first outer pipe and/or the second outer pipe is provided with scale marks for marking the axial sliding distance of the first outer pipe relative to the second outer pipe.

In one embodiment, the control tube assembly comprises a connecting tube and a transmission tube, one end of the connecting tube is connected with the connecting sleeve, the other end of the connecting tube is connected with the transmission tube, the transmission tube is in transmission fit with a telescopic control mechanism, and the telescopic control mechanism is used for driving the transmission tube and the connecting tube to move axially.

In one embodiment, the transmission pipe is provided with a first installation groove penetrating along the radial direction, the connecting pipe is provided with a first annular groove, the connecting pipe at least partially penetrates through the transmission pipe and the first annular groove is communicated with the first installation groove, the control pipe assembly further comprises a first connecting piece, and the first connecting piece penetrates through the first installation groove and the first annular groove to limit the axial movement of the connecting pipe relative to the transmission pipe.

In one embodiment, the telescopic knife tube further comprises a supporting sleeve, and the supporting sleeve is sleeved outside the connecting tube and is abutted against the inner side of the first outer tube.

In one embodiment, the connecting sleeve comprises a body and a first connecting section, a first step surface is formed at the connecting position of the outer peripheral side of the first connecting section and the body, and the first outer pipe is sleeved outside the first connecting section and is abutted against the first step surface; the inner side of the first connecting section and the connecting part of the body form a second step surface, and the control pipe assembly is arranged in the first connecting section in a penetrating mode and is abutted to the second step surface.

In one embodiment, the first inner pipe is a solid pipe body, a first mounting hole is formed in one end of the first inner pipe, the cutter head comprises a cutter head main body and a second connecting section, a third step surface is formed at the joint of the cutter head main body and the second connecting section, and the first inner pipe penetrates through the second connecting section and is abutted to the third step surface.

In one of them embodiment, the connecting sleeve is equipped with along the second mounting groove that radially runs through, the tool bit has seted up the second annular, the second annular with the second mounting groove intercommunication, cutter unit still includes the second connecting piece, the second connecting piece wear to establish the second mounting groove with in the second annular with the restriction the tool bit is relative the axial displacement of adapter sleeve.

In one embodiment, the cutter assembly further comprises a rotating sleeve disposed between the cutter head and the connecting sleeve.

On the other hand, the application also provides a medical cutter, which comprises a cutter head component and the telescopic cutter tube.

Above-mentioned scalable sword pipe is through configuring the inner tube subassembly into first inner tube and the second inner tube of relative slip, configure the outer tube subassembly into first outer tube and the second outer tube of relative slip, and be connected with the adapter sleeve through the control tube subassembly, first outer tube is connected with the adapter sleeve, first inner tube is connected with the tool bit, thereby drive control tube subassembly axial displacement, can order about first inner tube relative second inner tube along axial slip and order about first outer tube relative second outer tube along axial slip, the synchronous flexible of inner tube subassembly and outer tube subassembly has been realized promptly, and then realize adjusting the whole axial length of scalable sword pipe, in order to satisfy various operation scene demands. Simultaneously, the inner pipe assembly, the control pipe assembly and the outer pipe assembly are sequentially sleeved from inside to outside to form a three-layer structure, so that the overall strength of the telescopic knife pipe is improved, the innermost inner pipe assembly can transmit torque, and the high-speed rotation of the driving tool bit of the inner pipe assembly is not influenced when the telescopic knife pipe can flexibly stretch. The outmost outer pipe assembly can protect human tissues and prevent the inner pipe assembly from being scratched by high-speed rotation.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a medical cutting tool according to an embodiment;

FIG. 2 is a cross-sectional view of the medical tool shown in FIG. 1;

FIG. 3 is an exploded view of an embodiment of a retractable knife tube;

FIG. 4 is a cross-sectional view of an embodiment of an inner tube assembly;

FIG. 5 is an enlarged cross-sectional view of the inner tube assembly shown in FIG. 3, taken at section C-C;

FIG. 6 is a schematic structural view of an outer tube assembly according to an embodiment;

FIG. 7 is a cross-sectional view of the outer tube assembly shown in FIG. 6;

FIG. 8 is an enlarged cross-sectional view of the outer tube assembly shown in FIG. 7 taken at section D-D;

FIG. 9 is a schematic structural diagram of a control tube assembly according to one embodiment;

FIG. 10 is a schematic structural view of the drive tube of the control tube assembly shown in FIG. 9;

FIG. 11 is a schematic structural view of a connecting tube of the control tube assembly shown in FIG. 9;

fig. 12 is a partially enlarged view of a portion a shown in fig. 2;

fig. 13 is a partially enlarged view of a portion B shown in fig. 2;

FIG. 14 is an exploded view of the telescoping control mechanism of one embodiment;

FIG. 15 is a cross-sectional view of an embodiment of a telescoping control mechanism;

FIG. 16 is a side elevational view of the telescoping control mechanism illustrated in FIG. 15;

FIG. 17 is a schematic structural view of a supporting rod according to an embodiment;

FIG. 18 is a schematic diagram of a second end sleeve according to an embodiment.

Description of reference numerals:

10. a cutter head assembly; 11. a cutter head; 111. a tool bit body; 112. a second connection section; 113. a second ring groove; 12. connecting sleeves; 121. a body; 122. a first connection section; 123. a second mounting groove; 13. a second connecting member; 14. rotating the sleeve; 20. an inner tube assembly; 21. a first inner tube; 211. a first mounting hole; 212. a first groove; 22. a second inner tube; 221. a first rib; 222. a first reinforcement groove; 30. a control tube assembly; 31. a connecting pipe; 311. a first ring groove; 32. a drive tube; 321. an external thread; 322. a first mounting groove; 33. a support sleeve; 40. an outer tube assembly; 41. a first outer tube; 411. a second groove; 42. a second outer tube; 421. a second rib; 422. a second reinforcement groove; 60. a telescoping control mechanism; 61. adjusting the gear ring; 611. a first tooth; 62. a planet wheel; 63. a sun gear; 631. an internal thread; 632. a stepped groove; 64. a support bar; 641. a first stage; 642. a second stage; 643. a threaded section; 651. a first elastic ring; 652. a second elastic ring; 66. a limiting sleeve; 71. a first support assembly; 711. a first end sleeve; 712. a stepped bushing; 713. a first through hole; 714. a first connection hole; 72. a second support assembly; 721. a second end sleeve; 7211. installing threads; 7212. installing a groove; 7213. a second through hole; 7314. a threaded hole; 722. a first handle; 723. an elastic pad; 724. a second handle.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1 and 2, one aspect of the present application provides a medical cutter. The medical cutter of an embodiment comprises a cutter head component 10, a telescopic cutter tube and a telescopic control mechanism 60 matched with the telescopic cutter tube, wherein the cutter head component 10 comprises a connecting sleeve 12 and a cutter head 11, and the cutter head 11 is rotatably arranged through the connecting sleeve 12. The telescopic knife tube is connected with the knife head component 10, and the telescopic control mechanism 60 is used for controlling the telescopic knife tube to stretch along the axial direction, so that the length of the medical knife can be flexibly adjusted to meet different operation requirements.

Specifically, in conjunction with fig. 3, the present application also provides a retractable knife tube, the retractable knife tube of an embodiment including an inner tube assembly 20, an outer tube assembly 40, and a control tube assembly 30. The inner tube assembly 20 includes a first inner tube 21 and a second inner tube 22 slidably connected, the first inner tube 21 is connected to the cutter head 11, and the second inner tube 22 is used for transmitting torque to drive the first inner tube 21 and the cutter head 11 to rotate. The outer tube assembly 40 is sleeved outside the inner tube assembly 20, the outer tube assembly 40 includes a first outer tube 41 and a second outer tube 42 which are slidably connected, and the first outer tube 41 is connected with the connecting sleeve 12. The control tube assembly 30 is inserted between the inner tube assembly 20 and the outer tube assembly 40, the control tube assembly 30 is connected to the connecting sleeve 12, and the control tube assembly 30 can move in the axial direction to drive the first inner tube 21 to slide in the axial direction relative to the second inner tube 22 and drive the first outer tube 41 to slide in the axial direction relative to the second outer tube 42.

According to the telescopic knife tube, the inner tube assembly 20 is configured into the first inner tube 21 and the second inner tube 22 which can slide relatively, the outer tube assembly 40 is configured into the first outer tube 41 and the second outer tube 42 which can slide relatively, the control tube assembly 30 is connected with the connecting sleeve 12, the first outer tube 41 is connected with the connecting sleeve 12, and the first inner tube 21 is connected with the knife head 11, so that the control tube assembly 30 is driven to move axially, the first inner tube 21 can be driven to slide axially relative to the second inner tube 22, and the first outer tube 41 can be driven to slide axially relative to the second outer tube 42, synchronous telescopic of the inner tube assembly 20 and the outer tube assembly 40 is realized, and further, the whole axial length of the telescopic knife tube can be adjusted, so that various operation scene requirements can be met. Meanwhile, the inner tube assembly 20, the control tube assembly 30 and the outer tube assembly 40 are sequentially sleeved from inside to outside to form a three-layer structure, so that the overall strength of the telescopic knife pipe is improved, the inner tube assembly 20 at the innermost layer can transmit torque, and the high-speed rotation of the driving tool bit 11 of the inner tube assembly 20 is not influenced while the telescopic knife pipe can flexibly stretch. The outermost outer tube assembly 40 protects the body tissue and prevents the inner tube assembly 20 from scratching the body tissue by rotating at high speed.

Specifically, in the medical cutting tool of the present embodiment, the telescopic control mechanism 60 is used in cooperation with the telescopic knife tube, and the telescopic control mechanism 60 drives the control tube assembly 30 to move axially, so as to adjust the length of the telescopic catheter. In other embodiments, the retractable knife tube can be used alone, and the length of the retractable guide tube can be adjusted by manually driving the control tube assembly 30 to move axially, which is not described herein.

Referring to fig. 4 and 5, in the present embodiment, the first inner tube 21 is slidably inserted into the second inner tube 22, a first groove 212 extending along the axial direction is disposed on an outer peripheral side of the first inner tube 21, a first rib 221 extending along the axial direction is disposed on an inner side of the second inner tube 22, the first rib 221 is slidably disposed in the first groove 212, and the first rib 221 is slidably disposed in the first groove 212, so that the fluency of the first inner tube 21 when axially extending and retracting relative to the second inner tube 22 is improved, meanwhile, the first rib 221 is matched with the first groove 212 to further limit the rotation of the first inner tube 21 relative to the second inner tube 22, and it is ensured that the first inner tube 21 and the second inner tube 22 can synchronously rotate, so that the torque output by the second inner tube 22 can be stably transmitted to the tool bit 11 through the first inner tube 21 to drive the tool bit 11 to rotate. Preferably, the outer peripheral side of the first inner tube 21 is provided with a plurality of first grooves 212, correspondingly, the inner side of the second inner tube 22 is provided with a plurality of first ribs 221, the first grooves 212 and the first ribs 221 are in one-to-one corresponding sliding fit, and the relative sliding stability of the first inner tube 21 and the second inner tube 22 is further improved.

It should be noted that, in other embodiments, the first inner tube 21 may also be sleeved outside the second inner tube 22, at this time, the first rib 221 is disposed inside the first inner tube 21, and the first groove 212 is disposed on the outer peripheral side of the second inner tube 22, so as to ensure that the first inner tube 21 and the second inner tube 22 can stably extend and retract and synchronously rotate, which is not described herein again.

Preferably, in the present embodiment, the outer peripheral side of the second inner tube 22 is provided with a first reinforcing groove 222 extending in the axial direction. By providing the first reinforcing groove 222 on the outer peripheral side of the second inner tube 22 and providing the first rib 221 on the inner side of the second inner tube 22, the bending strength of the second inner tube 22 can be effectively improved, and the strength of the extendable knife pipe as a whole can be improved. Preferably, the position of the first reinforcing groove 222 corresponds to the position of the first rib 221, so that the first reinforcing groove 222 and the first rib 221 can be formed by one-time extrusion in the second inner tube 22, and the processing is simpler.

Referring to fig. 6 to 8, in the present embodiment, the first outer tube 41 is slidably inserted into the second outer tube 42, a second groove 411 extending along the axial direction is disposed on an outer peripheral side of the first outer tube 41, a second rib 421 extending along the axial direction is disposed on an inner side of the second outer tube 42, the second rib 421 is slidably disposed in the second groove 411, and the second rib 421 is slidably disposed in the second groove 411, so that smoothness of the first outer tube 41 when axially extending and retracting relative to the second outer tube 42 is improved.

It should be noted that, in other embodiments, the first outer tube 41 may also be sleeved outside the second outer tube 42, at this time, the second rib 421 is disposed inside the first outer tube 41, and the second groove 411 is disposed on the outer peripheral side of the second outer tube 42, so as to ensure that the first outer tube 41 and the second outer tube 42 can stably extend and retract, which is not described herein again.

Preferably, in the present embodiment, the outer peripheral side of the second outer tube 42 is provided with a second reinforcing groove 422 extending in the axial direction. The second reinforcing groove 422 is formed on the outer peripheral side of the second outer tube 42, and the second rib 421 is formed on the inner side of the second outer tube 42, so that the bending strength of the second outer tube 42 can be effectively improved, and the strength of the telescopic knife tube can be integrally improved. Preferably, the position of the second reinforcing groove 422 corresponds to the position of the second rib 421, so that the second reinforcing groove 422 and the second rib 421 can be formed by one-time extrusion on the second outer tube 42, and the processing is simpler.

Referring to fig. 6, scale marks are arranged on the outer peripheral sides of the first outer tube 41 and/or the second outer tube 42, and the scale marks are used for marking the axial sliding distance of the first outer tube 41 relative to the second outer tube 42, so that a doctor can accurately grasp the length of the telescopic knife handle by observing the scale marks.

Preferably, in this embodiment, when fully retracted, the first inner tube 21 can be completely hidden in the second inner tube 22, the first outer tube 41 can be completely hidden in the second outer tube 42, and the length of the retractable knife tube when fully extended is 2 times the length of the retractable knife tube when fully retracted, which can fully meet the requirements of different surgical scenes.

Referring to fig. 12, the connection sleeve 12 includes a body 121 and a first connection section 122, a first step surface is formed at a connection portion between an outer peripheral side of the first connection section 122 and the body 121, and the first outer tube 41 is sleeved outside the first connection section 122 and abutted against the first step surface, so that the first outer tube 41 and the connection sleeve 12 are stably connected, and it is worth to say that the first outer tube 41 can also be fixedly connected with the connection sleeve 12 by welding, adhesive bonding, or threaded connection.

A second step surface is formed at a joint of the inner side of the first connecting section 122 and the body 121, and the control tube assembly 30 is inserted into the first connecting section 122 and abuts against the second step surface, so that the control tube assembly 30 is stably connected with the connecting sleeve 12, and it should be noted that the control tube assembly 30 can also be fixedly connected with the connecting sleeve 12 through welding, adhesive bonding, threaded connection or other manners.

Further, first inner tube 21 is solid body, first mounting hole 211 has been seted up to the one end of first inner tube 21, tool bit 11 includes tool bit main part 111 and second linkage segment 112, the junction of tool bit main part 111 and second linkage segment 112 is formed with the third step face, first inner tube 21 wears to establish in second linkage segment 112 and with the butt of third step face to it is firm to make first inner tube 21 be connected with tool bit 11, guarantees that first inner tube 21 and tool bit 11 synchronous axial displacement or rotation. Understandably, the first inner pipe 21 can also be fixedly connected with the connecting sleeve 12 by welding, adhesive bonding, or screw connection. It should be noted that, in other embodiments, the first inner tube 21 may be a hollow tube.

Continuing to refer to fig. 12, the connection sleeve 12 is provided with a second installation groove 123 penetrating along the radial direction, the cutting head 11 is provided with a second annular groove 113, the second annular groove 113 is communicated with the second installation groove 123, the cutting head assembly 10 further comprises a second connecting member 13, and the second connecting member 13 is arranged in the second installation groove 123 and the second annular groove 113 in a penetrating manner to limit the axial movement of the connection head 11 relative to the connection sleeve 12, so that the rotation of the connection head 11 relative to the connection sleeve 12 is not influenced while the synchronous axial movement of the cutting head 11 and the tool is ensured. Preferably, the second mounting groove 123 is a semicircular groove, and the second connecting member 13 is a semicircular key, so as to facilitate the assembly of the cutter head 11 and the connecting sleeve 12.

Further, the cutter head assembly 10 further includes a rotating sleeve 14, and the rotating sleeve 14 is disposed between the cutter head 11 and the connecting sleeve 12. The rotating sleeve 14 is used to reduce the friction between the cutting head 11 and the connecting sleeve 12, so that the rotation of the cutting head 11 is more stable and smooth. Preferably, the rotating sleeve 14 in this embodiment is a copper sleeve, which has a small friction coefficient, and can effectively ensure that the cutter head 11 rotates smoothly, and in other embodiments, the rotating sleeve 14 may also be a bearing, etc.

Referring to fig. 9 to 11, the control tube assembly 30 includes a connection tube 31 and a transmission tube 32, one end of the connection tube 31 is connected to the connection sleeve 12, and the other end of the connection tube 31 is connected to the transmission tube 32. Specifically, the transmission pipe 32 is provided with a first mounting groove 322 penetrating along the radial direction, the connecting pipe 31 is provided with a first annular groove 311, the connecting pipe 31 at least partially penetrates through the transmission pipe 32, and the first annular groove 311 is communicated with the first mounting groove 322, the control pipe assembly 30 further comprises a first connecting piece, and the first connecting piece penetrates through the first mounting groove 322 and the first annular groove 311 to limit the axial movement of the connecting pipe 31 relative to the transmission pipe 32. Preferably, the first connecting member is a semicircular key, and the first mounting groove 322 is a semicircular groove, so that the connecting pipe 31 and the driving pipe 32 can be easily assembled. It should be noted that the connecting tube 31 can also be fixedly connected to the transmission tube 32 by welding, adhesive bonding, or screwing. In addition, the connecting tube 31 and the transmission tube 32 may be a single tube body formed integrally.

Further, referring to fig. 2 and 3, the medical knife further includes a support sleeve 33, the support sleeve 33 is sleeved outside the connection pipe 31 and abuts against the inner side of the first outer pipe 41, and the support sleeve 33 is used for supporting the first outer pipe 41, so that the structural strength of the first outer pipe 41 is improved, and the first outer pipe 41 and the control pipe assembly 30 are further ensured to be synchronously stretched and contracted. Preferably, the supporting sleeve 33 is provided in plurality, and the plurality of supporting sleeves 33 are arranged at intervals in the axial direction of the connecting pipe 31. Further, a gap of 0.05mm to 0.1mm is provided between the inner tube assembly 20 and the control tube assembly 30, thereby ensuring that the inner tube assembly 20 rotates at a high speed relative to the control tube assembly 30 without friction.

Referring to fig. 2 and 13, the transmission tube 32 is adapted to be in transmission fit with the telescoping control mechanism 60, and the telescoping control mechanism 60 is adapted to drive the transmission tube 32 and the connection tube 31 to move axially. Specifically, in the present embodiment, the transmission pipe 32 is in threaded fit with the telescopic control mechanism 60, so that the transmission pipe 32 can be driven to move axially by rotating the telescopic control mechanism 60, and then the connection pipe 31 is driven to move axially.

Specifically, in another aspect of the present application, a telescoping control mechanism 60 is also provided. Referring to fig. 13 and 14, the telescoping control mechanism 60 of an embodiment includes an adjusting ring gear 61 and a gear assembly, the gear assembly is sleeved outside the control tube assembly 30 and is provided with an internal thread 631, and specifically, the gear assembly is sleeved outside the transmission tube 32 of the control tube assembly 30 and the transmission tube 32 is provided with an external thread 321 matched with the internal thread 631. Adjust ring gear 61 cover and establish outside the gear assembly, adjust the inboard of ring gear 61 and be equipped with the first tooth 611 with gear assembly engaged with, adjust ring gear 61 and be used for drive gear assembly to rotate to drive control pipe assembly 30 axial displacement, and then realize that tool bit subassembly 10 and scalable cutter pipe are flexible.

Above-mentioned flexible control mechanism 60 passes through gear assembly and control tube subassembly 30 screw-thread fit, and adjust ring gear 61 and gear assembly meshing, thereby can drive gear assembly through rotating the regulating gear and rotate, thereby drive control tube subassembly 30 axial displacement, it is flexible finally to make the tool bit subassembly 10 and the scalable sword pipe axial of being connected with control tube subassembly 30, and convenient operation is simple, and stepless adjustment can be realized with control tube subassembly 30 screw-thread fit to the gear assembly, on the basis that external screw thread 321 on control tube subassembly 30 is enough long, the length of scalable sword pipe can be adjusted wantonly, it is unrestricted to adjust the stroke, and then satisfy the different demands to the length of medical cutter under the various operation scenes, make the operation more convenient, improve the operation success rate.

Furthermore, the medical knife further comprises a first supporting component 71 and a second supporting component 72 which are arranged at intervals, the gear component is rotatably arranged between the first supporting component 71 and the second supporting component 72, one end of the adjusting gear ring 61 is sleeved on the first supporting component 71, the other end of the adjusting gear ring 61 is sleeved on the second supporting component 72, and the adjusting gear ring 61 can rotate relative to the first supporting component 71 and the second supporting component 72. The first and second support assemblies 71 and 72 are used to support the gear assembly and adjust the ring gear 61.

Further, referring to fig. 13, 14 and 18, the first support assembly 71 is provided with a first through hole 713, the second support assembly 72 is provided with a second through hole 7213 communicating with the first through hole 713, and one end of the second outer tube 42 remote from the first outer tube 41 is fixed to the first support assembly 71, so that the second outer tube 42 is fixed to the first replacement assembly. One end of the second inner tube 22 far away from the first inner tube 21 passes through the first through hole 713 and the second through hole 7213 and is used for connecting with the rotary driving member, so that the torque output by the rotary driving member can be transferred to the cutter head 11 by driving the second inner tube 22 by the rotary driving member. Preferably, the rotary drive member may be a motor provided on the power handpiece. Further, the transmission tube 32 of the control tube assembly 30 is movably disposed through the first through hole 713 and the second through hole 7213. The transmission tube 32 can be movably arranged in the first through hole 713 and the second through hole 7213 in a penetrating manner, so that the transmission tube 32 can penetrate through the telescopic control mechanism 60 when moving axially, the telescopic control mechanism 60 is prevented from limiting the moving stroke of the transmission tube 32, and the telescopic adjustment of the telescopic knife tube with long distance and large amplitude can be realized.

With continued reference to fig. 13, a first elastic ring 651 is disposed between the adjusting gear ring 61 and the first supporting assembly 71, and specifically, the first elastic ring 651 is sleeved on the first supporting assembly 71 and is in contact fit with the inner side of the adjusting gear ring 61. A second elastic ring 652 is arranged between the adjusting gear ring 61 and the second supporting component 72, and specifically, the second elastic ring 652 is sleeved on the second supporting component 72 and is in contact fit with the inner side of the adjusting gear ring 61. The damping effect of the first supporting component 71 and the second supporting component 72 on the adjusting gear ring 61 can be effectively increased through the first elastic ring 651 and the second elastic ring 652, the automatic rotation of the adjusting gear is avoided, the engagement effect of the adjusting gear ring 61 and the gear component is matched, the self-locking effect of the telescopic control mechanism 60 can be effectively formed, and then the automatic retraction of the telescopic knife tube in place is avoided. Preferably, the first elastic ring 651 and the second elastic ring 652 are both O-rings.

Referring to fig. 15 and 16, the gear assembly of an embodiment includes a sun gear 63, a support rod 64, and a planet gear 62, wherein the sun gear 63 is rotatably sleeved on the control tube assembly 30, and an internal thread 631 is provided inside the sun gear 63, so that the sun gear 63 is in threaded engagement with the transmission tube 32 of the control tube assembly 30. One end and the first supporting component 71 of bracing piece 64 are connected, the other end and the second supporting component 72 of bracing piece 64 are connected, planet wheel 62 rotationally overlaps and establishes at bracing piece 64, and planet wheel 62 meshes with first tooth 611 and sun gear 63, thereby adjust ring gear 61 and can drive planet wheel 62 and orbit Cheng Gan forward rotation when the forward rotation, and then drive sun gear 63 reverse rotation, make control tube subassembly 30 stretch out forward, finally realize scalable cutter tube extension. It will be readily appreciated that when the adjustment gear ring 61 is rotated in the reverse direction, a telescoping knife tube shortening is achieved.

Through adjusting ring gear 61 and planet wheel 62 meshing cooperation, planet wheel 62 and sun gear 63 meshing cooperation to through the gear ratio configuration that will adjust ring gear 61 and sun gear 63 for the big proportion gear ratio, can realize the flexible distance around the scalable sword pipe of quick adjustment. And the gear ratio of the planet wheel 62 and the sun wheel 63 can be selected and set according to actual requirements, so that the telescopic control mechanism 60 forms a proper adjusting multiple.

It should be noted that in another embodiment, the gear assembly may be a single gear, and the single gear is threadedly engaged with the control tube assembly 30 and engaged with the adjusting gear ring 61, so that the telescopic knife tube can be controlled to extend and retract by rotating the adjusting gear ring 61.

Referring to fig. 16, the gear assembly comprises at least two support rods 64, each support rod 64 being arranged at intervals around the circumference of the sun gear 63, each support rod 64 being sleeved with a planet wheel 62. For example, in the present embodiment, the gear assembly includes three support rods 64, the three support rods 64 are uniformly spaced around the circumference of the sun gear 63, and each support rod 64 is sleeved with one planet wheel 62, so that the three planet wheels 62 are engaged with the sun gear 63, and the transmission stability of the planet wheels 62 and the sun gear 63 is improved.

Referring to fig. 14 and fig. 17, further, the supporting rod 64 includes a first section 641 and a second section 642, the diameter of the second section 642 is greater than that of the first section 641, a limiting step is formed between the first section 641 and the second section 642, a limiting sleeve 66 spaced from the limiting step is further sleeved on the first section 641, the planet wheel 62 is sleeved between the limiting step and the limiting sleeve 66, the planet wheel 62 can be effectively positioned through the limiting function of the limiting step and the limiting sleeve 66, the axial float of the planet wheel 62 along the supporting rod 64 is avoided, and the transmission stability of the planet wheel 62 is further improved.

Referring to fig. 13 and 15, stepped grooves 632 are formed on both sides of the sun gear 63, at least a portion of the first support member 71 is inserted into the stepped groove 632 on one side, and at least a portion of the second support member 72 is inserted into the stepped groove 632 on the other side. The stepped grooves 632 on the two sides are respectively matched with the first supporting piece and the second supporting piece, so that the sun gear 63 can be effectively axially positioned, the axial movement of the sun gear 63 along the transmission pipe 32 is avoided, and the transmission stability of the sun gear 63 is further improved.

Specifically, referring to fig. 13 and 14, the first support assembly 71 includes a connecting first end housing 711 and a stepped bushing 712. Preferably, the first end cap 711 and the stepped bushing 712 may be screwed or welded or bonded or interference fit. The first end sleeve 711 is located to the pot head of adjusting ring gear 61, and the one end that the first outer tube 41 was kept away from to second outer tube 42 is fixed in first end sleeve 711, and first end sleeve 711 is equipped with first connecting hole 714, and bracing piece 64 wears to establish in first connecting hole 714, and the ladder groove 632 of the one side of sun gear 63 is worn to establish in order to carry out axial spacing to sun gear 63 to the one end of ladder bush 712.

Referring to fig. 13 and 18, the second supporting assembly 72 includes a second end sleeve 721 and a first shank 722 connected to each other, the other end of the adjusting ring gear 61 is sleeved on the first shank 722, the second end sleeve 721 is provided with a threaded hole 7314 corresponding to the first connecting hole 714, the supporting rod 64 further includes a threaded section 643, and the supporting rod 64 is in threaded engagement with the threaded hole 7314 through the threaded section 643. One end of the second end sleeve 721 is inserted into the stepped groove 632 on the other side of the sun gear 63 to axially limit the sun gear 63.

With continued reference to fig. 18, further, the second end sleeve 721 is provided with mounting threads 7211, the second end sleeve 721 is threadedly coupled to the first blade handle 722, and further, the end of the second end sleeve 721 that penetrates into the stepped slot 632 is provided with mounting grooves 7212, the mounting grooves 7212 being adapted to mate with a mounting tool, such as a screwdriver, to facilitate mounting the second segment 642 to the first blade handle 722. Of course, in other embodiments, the second sleeve 721 may be welded to the first blade shaft 722, or bonded or interference fit. Preferably, an elastic pad 723 is further disposed between the second end sleeve 721 and the first blade handle 722, and the elastic pad 723 can reduce an assembly error of each component of the telescopic control mechanism 60 in an axial direction, so that the components are more compactly matched.

Further, referring to fig. 1 and 2, the medical knife further includes a second knife handle 724, and the second knife handle 724 is rotatably connected to an end of the first knife handle 722 far away from the second end sleeve 721. Preferably, a friction sleeve is arranged between the second tool shank 724 and the first tool shank 722, so that friction between the first tool shank 722 and the second tool shank 724 is reduced. Further, the second handle 724 is sleeved on the second inner tube 22, and the second handle 724 is used for connecting the rotary driving member to drive the inner tube assembly 20 and the cutter head 11 to rotate. Specifically, the second knife handle 724 is used for connecting to a power mobile phone, and the inner tube assembly 20 is driven to rotate by a motor on the power mobile phone.

The length adjustment of the medical cutter is realized through the cooperation of the telescopic cutter tube and the telescopic control mechanism 60, wherein the telescopic cutter tube configures the inner tube assembly 20 into the first inner tube 21 and the second inner tube 22 which can slide relatively, configures the outer tube assembly 40 into the first outer tube 41 and the second outer tube 42 which can slide relatively, and is connected with the connecting sleeve 12 through the control tube assembly 30, the first outer tube 41 is connected with the connecting sleeve 12, and the first inner tube 21 is connected with the cutter head 11, so that the control tube assembly 30 is driven to axially move through the telescopic control mechanism 60, the first inner tube 21 can be driven to axially slide relative to the second inner tube 22, and the first outer tube 41 can be driven to axially slide relative to the second outer tube 42, so that the synchronous telescopic of the inner tube assembly 20 and the outer tube assembly 40 is realized, the integral axial length of the telescopic cutter tube is adjusted, and the requirements of various surgical scenes are met. Telescopic control mechanism 60 passes through gear assembly and control tube subassembly 30 screw-thread fit, and adjust ring gear 61 and gear assembly meshing, thereby can drive gear assembly through rotating the regulating gear and rotate, thereby drive control tube subassembly 30 axial displacement, it is flexible finally to make the tool bit subassembly 10 of being connected with control tube subassembly 30 and scalable sword pipe axial, convenient operation is simple, and stepless adjustment can be realized with control tube subassembly 30 screw-thread fit to the gear assembly, the length that can stretch out and draw back the sword pipe can be adjusted wantonly, it is unrestricted to adjust the stroke, and then satisfy the different demands to the length of medical cutter under the various operation scenes, make the operation more convenient, the operation success rate is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (11)

1. A telescopic knife tube is used for a medical knife, the medical knife comprises a knife head component, the knife head component comprises a connecting sleeve and a knife head, and the knife head can rotatably penetrate through the connecting sleeve; its characterized in that, scalable sword pipe includes:

the inner pipe assembly comprises a first inner pipe and a second inner pipe which are connected in a sliding mode, the first inner pipe is connected with the cutter head, and the first inner pipe and the second inner pipe are used for transmitting torque to drive the cutter head to rotate;

the outer pipe assembly is sleeved outside the inner pipe assembly and comprises a first outer pipe and a second outer pipe which are connected in a sliding mode, and the first outer pipe is connected with the connecting sleeve; and the number of the first and second groups,

the control tube assembly is arranged in a penetrating mode between the inner tube assembly and the outer tube assembly, the control tube assembly is connected with the connecting sleeve, the control tube assembly can move axially to drive the first inner tube to be relative to the second inner tube to slide axially and drive the first outer tube to be relative to the second outer tube to slide axially.

2. The retractable knife tube of claim 1, wherein the first inner tube is slidably disposed through the second inner tube, the outer peripheral side of the first inner tube is provided with a first groove extending in the axial direction, the inner side of the second inner tube is provided with a first rib extending in the axial direction, and the first rib is slidably disposed in the first groove.

3. The retractable knife tube of claim 2, wherein the outer peripheral side of the second inner tube is provided with a first reinforcing groove extending in the axial direction, and the position of the first reinforcing groove corresponds to the position of the first rib.

4. The retractable knife tube of claim 1, wherein the first outer tube is slidably disposed through the second outer tube, the outer peripheral side of the first outer tube is provided with a second groove extending in the axial direction, the inner side of the second outer tube is provided with a second rib extending in the axial direction, and the second rib is slidably disposed in the second groove.

5. The retractable knife tube of claim 4, wherein the outer peripheral side of the second outer tube is provided with a second reinforcing groove extending in the axial direction, and the position of the second reinforcing groove corresponds to the position of the second rib.

6. The telescopic knife tube of claim 1, wherein the control tube assembly comprises a connecting tube and a transmission tube, one end of the connecting tube is connected with the connecting sleeve, the other end of the connecting tube is connected with the transmission tube, the transmission tube is in transmission fit with a telescopic control mechanism, and the telescopic control mechanism is used for driving the transmission tube and the connecting tube to move axially.

7. The retractable knife tube of claim 6, wherein the transmission tube has a first mounting groove extending radially therethrough, the connecting tube has a first annular groove, the connecting tube is at least partially disposed through the transmission tube and the first annular groove communicates with the first mounting groove, the control tube assembly further comprises a first connecting member disposed through the first mounting groove and the first annular groove to limit axial movement of the connecting tube relative to the transmission tube.

8. The retractable knife tube of claim 6, further comprising a support sleeve, wherein the support sleeve is sleeved outside the connecting tube and abuts against the inner side of the first outer tube.

9. The telescopic knife tube according to claim 1, wherein the connecting sleeve comprises a body and a first connecting section, a first step surface is formed at the joint of the outer peripheral side of the first connecting section and the body, and the first outer tube is sleeved outside the first connecting section and is abutted against the first step surface; the inner side of the first connecting section and the connecting part of the body form a second step surface, and the control pipe assembly is arranged in the first connecting section in a penetrating mode and is abutted to the second step surface.

10. The telescopic knife tube according to claim 1, wherein the first inner tube is a solid tube, a first mounting hole is formed in one end of the first inner tube, the knife head comprises a knife head main body and a second connecting section, a third step surface is formed at the joint of the knife head main body and the second connecting section, and the first inner tube penetrates through the second connecting section and abuts against the third step surface.

11. A medical cutting tool comprising a cutting head assembly and a retractable blade tube as claimed in any one of claims 1 to 10.

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