Rotary-cut needle handle screw shaft and gear shaft rear end connecting structure and rotary-cut needle

Abstract

The utility model belongs to the technical field of rotary cutting needles, and particularly relates to a rotary cutting needle handle screw shaft and gear shaft rear end connecting structure and a rotary cutting needle, the rotary cutting needle handle screw shaft and gear shaft rear end connecting structure comprises a shell, a transmission assembly and a power assembly, the transmission assembly comprises a screw shaft and a gear shaft, the rear end of the screw shaft and the rear end of the gear shaft are both provided with connecting parts, and the connecting parts are connected with the shell. Uniformly arranged connecting grooves are formed in the side surface of the connecting part; a sleeve shaft is arranged in the power assembly, and a plum blossom groove matched with the connecting part is formed in the sleeve shaft. A sleeve shaft is arranged in a power assembly, one end of the sleeve shaft is connected with the power output end of a power source, a plum blossom groove is formed in the end, opposite to a screw shaft and a gear shaft, of the sleeve shaft, connecting parts are arranged at the ends of the screw shaft and the gear shaft and are of a cylindrical structure, and a plurality of connecting grooves are formed in the side faces of the connecting parts. Stable connection between the power assembly and the shell can be achieved, and installation is convenient and fast.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary cutting needles, in particular to a rear end connection structure of a rotary cutting needle handle screw shaft and a gear shaft and a rotary cutting needle. Background Art

[0002] As a minimally invasive surgery, atherectomy is widely used in the treatment of breast lesions, varicose veins, etc. Existing ultrasound-guided breast vacuum minimally invasive atherectomy requires that the atherectomy needle can meet the requirements of relatively superficial surgical tasks.

[0003] In the prior art, the power component needs to be repeatedly disassembled and assembled with the housing to meet the needs of replacing housing consumables. During the replacement process, it is necessary to effectively connect the power source with the screw shaft and gear shaft in the housing to ensure safe use and convenient installation. However, in the prior art, the connection between the power source and the screw shaft and gear shaft in the housing is unstable. For example, the installation gap leads to lag in the transmission process. When the installation gap is effectively controlled, it will cause difficulty in disassembly and assembly.

[0004] Various aspects of the present invention are intended to solve at least one of the above problems and / or disadvantages and provide at least the following advantages. To this end, the present invention provides a rear end connection structure of a rotary cutting needle handle screw shaft and a gear shaft and a rotary cutting needle. Utility Model Content

[0005] In order to overcome the defects in the prior art, convenient installation between the power component and the screw shaft and gear shaft in the shell is achieved, and the connection stability between the power source and the screw shaft and gear shaft in the shell is high, therefore, a rear end connection structure of the screw shaft and gear shaft of the rotary cutting needle handle and a rotary cutting needle are provided.

[0006] The utility model solves its technical problems and achieves the purpose of overcoming the above technical problems. The technical scheme adopted is: the rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle of the utility model comprises: a shell; a transmission assembly installed inside the shell, the transmission assembly comprises a screw shaft and a gear shaft, the rear ends of the screw shaft and the gear shaft are both provided with a connecting part, and the connecting part passes through the rear end surface of the shell and extends to the outside of the shell, and the side surface of the connecting part is provided with evenly arranged connecting grooves; a power assembly is installed on the shell, the power assembly is provided with a sleeve shaft inside, and the sleeve shaft is provided with a plum blossom groove matched with the connecting part, which is suitable for the power source to drive the corresponding screw shaft or the gear shaft through the sleeve shaft.

[0007] In some embodiments, the connecting groove extends from the end of the connecting portion toward the shell, and the connecting groove continuously moves away from the axis of the connecting portion during the extension toward the shell, so that the connecting groove stops extending before the connection contact position between the connecting portion and the shell.

[0008] In some embodiments, the end position of the connecting part has a first inclined surface; the connecting position between the sleeve shaft and the connecting part is a cylinder, the cylinder is provided with the plum blossom groove relative to one end of the connecting part, the plum blossom groove includes a circular groove and ribs, the circular groove is adapted to the connecting part, a plurality of ribs are provided inside the circular groove, and the ribs are adapted to the connecting groove; a second inclined surface is provided at the notch position of the circular groove, the end of the rib is close to the notch of the circular groove, and a third inclined surface is provided at the notch position of the circular groove.

[0009] In some embodiments, the shell is provided with a first connecting frame and a second connecting frame, the first connecting frame is provided with a first mounting groove, the rotation of the screw shaft is connected to the inside of the first mounting groove, the second connecting frame is provided with a second mounting groove, the rotation of the gear shaft is connected to the inside of the second mounting groove; the connecting groove terminates and extends before the connection position between the connecting portion and the first mounting groove or the second mounting groove.

[0010] In some embodiments, the screw shaft is made of metal material, the first mounting groove has an opening at the top, and the first mounting groove passes through the axial direction of the screw shaft, suitable for the position near the end of the screw shaft to be placed in the first mounting groove through the opening of the first mounting groove, and the first mounting groove can support the side and bottom surfaces near the end of the screw shaft; the second mounting groove has an opening at the top, and the second mounting groove passes through the axial direction of the gear shaft, suitable for the position near the end of the gear shaft to be placed in the second mounting groove through the opening of the second mounting groove.

[0011] In some embodiments, a third mounting groove is provided inside the second mounting groove, and a swivel is provided near the end of the gear shaft. The swivel is rotatably connected to the inside of the third mounting groove, and the second mounting groove and the third mounting groove can jointly support the side and bottom surfaces near the end of the gear shaft.

[0012] In some embodiments, a fourth mounting groove is provided inside the third mounting groove, an annular groove is provided on the surface of the rotating ring, an O-ring is provided inside the annular groove, and the O-ring is adapted to the fourth mounting groove; a pressing piece is provided inside the shell at the top position of the screw shaft and the gear shaft, which is suitable for corresponding to the pressing piece to press the screw shaft or the gear shaft respectively to limit the up and down movement of the screw shaft and the gear shaft.

[0013] In some embodiments, a first limiting portion is provided at the end position of the screw shaft, and a movable gap is preset between the first limiting portion and the first connecting frame, which is suitable for the screw shaft to slide inside the first mounting groove along the axial direction of the screw shaft, and a spring is provided between the screw shaft and the first connecting frame.

[0014] In some embodiments, a second limiting portion is provided on the gear shaft, and the second limiting portion abuts against the second connecting frame, and is suitable for limiting sliding between the gear shaft and the second connecting frame along the axial direction of the gear shaft.

[0015] A rotary cutting needle comprises the rear end connection structure of the rotary cutting needle handle screw shaft and the gear shaft.

[0016] Compared with the prior art, the rear end connection structure of the rotary cutting needle handle screw shaft and the gear shaft and the rotary cutting needle provided by the utility model have the following beneficial effects:

[0017] 1. The utility model provides a rear end connection structure of the screw shaft and gear shaft of a rotary cutting needle handle and a rotary cutting needle, by setting a shell, a transmission assembly and a power assembly, and by setting a sleeve shaft in the power assembly, one end of the sleeve shaft is connected to the power output end of the power source, and a plum blossom groove is set at one end of the sleeve shaft relative to the screw shaft and the gear shaft. A connecting part is set at the end of the screw shaft and the gear shaft. The connecting part is a cylindrical structure, and a plurality of connecting grooves are set on the side of the connecting part, which can realize a stable connection between the power assembly and the shell, and the installation is convenient and quick.

[0018] 2. The utility model provides a rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle and a rotary cutting needle, wherein the connecting groove extends from the end of the connecting part toward the shell body, and the connecting groove continuously moves away from the axis of the connecting part during the process of extending toward the shell body, so that the connecting groove is inclined along the axis of the connecting part. When the connecting part is inserted into the plum blossom groove of the sleeve shaft, the inclined connecting groove can play a guiding role, avoiding the problem that the connecting part cannot be quickly and effectively inserted into the plum blossom groove of the sleeve shaft due to large deviation of the connecting part or the sleeve shaft, thereby improving installation efficiency;

[0019] 3. The utility model provides a rear end connection structure of the screw shaft and gear shaft of a rotary cutting needle handle and a rotary cutting needle. By setting a first limiting portion at the end position of the screw shaft, the screw shaft can slide along the axial direction of the screw shaft inside the first mounting groove. A spring is set between the screw shaft and the first connecting frame. When the screw shaft stops rotating, the screw shaft continues to rotate under the action of inertia, or the rotation control of the screw shaft is not stopped in time. Through the reverse movement of the screw shaft, the transmission mechanism where the entire screw shaft is located can be effectively protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 A three-dimensional diagram of a rotary cutting needle in one embodiment of the present invention;

[0022] Figure 2 A first stereoscopic view of the interior of a rotary cutting needle in one embodiment of the present invention;

[0023] Figure 3 A second stereoscopic view of the interior of a rotary cutting needle in one embodiment of the present invention;

[0024] Figure 4 for Figure 2 A partial enlarged view of point A in the middle;

[0025] Figure 5 for Figure 3 A partial enlarged view of point B in the middle;

[0026] Figure 6 A three-dimensional diagram of a sleeve shaft in one embodiment of the present utility model;

[0027] Figure 7 It is a stereoscopic diagram of the screw shaft connection state in another embodiment of the present invention.

[0028] In the figure: housing 100, first connecting frame 110, first mounting groove 111, first limiting portion 112, spring 113, second connecting frame 120, second mounting groove 121, third mounting groove 122, swivel 123, fourth mounting groove 124, annular groove 125, O-ring 126, second limiting portion 127, pressing piece 130, transmission assembly 200, screw shaft 210, gear shaft 220, connecting portion 230, connecting groove 240, first inclined surface 250,

[0029] The power assembly 300 , the sleeve shaft 310 , the column 311 , the hexagram groove 320 , the circular groove 321 , the ribs 322 , the second inclined surface 323 , and the third inclined surface 324 . DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0031] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0032] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0034] In addition, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0035] like Figure 1-Figure 7As shown, the present embodiment provides a rear end connection structure of the screw shaft 210 and the gear shaft 220 of the rotary cutting needle handle, including a housing 100, a transmission assembly 200 and a power assembly 300. The transmission assembly 200 is arranged inside the housing 100, and the transmission assembly 200 mainly includes a screw shaft 210 and a gear shaft 220. The power assembly 300 can be quickly disassembled and assembled with the housing 100 by a quick connection. When the rotary cutting needle needs to work, the power assembly 300 is installed on the housing 100, and the power source in the power assembly 300, which is usually a motor, drives the screw shaft 210 and the gear shaft 220 to rotate, thereby controlling the rotary cutting work of the rotary cutting needle. This process is a prior art. For ease of understanding, the process is briefly described as follows: In the housing 100 The front end position of the device is provided with an outer sleeve and an inner rotary cutting knife tube, which are inserted into a position beside the diseased tissue of the human body through the outer sleeve. The screw shaft 210 is provided with a slider matched with the thread on the screw shaft 210 to control the rotation of the screw shaft 210. The screw shaft 210 will drive the slider to move back and forth, and the slider will then drive the inner rotary cutting knife tube to move, so that the inner rotary cutting knife tube moves toward the rotary cutting side hole position at the end of the outer knife tube, and cooperates with the negative pressure suction hole inside the outer catheter at the rotary cutting side hole position to absorb the diseased tissue and guide the diseased tissue into the rotary cutting side hole. As the inner rotary cutting knife tube is introduced into the rotary cutting side hole, the gear shaft 220 driven by the power source rotates at the same time, and the gear shaft 220 drives the inner rotary cutting knife tube to rotate, so that the inner rotary cutting knife tube cuts the diseased tissue sucked into the rotary cutting side hole, thereby realizing the removal of the diseased tissue.

[0036] As a minimally invasive surgery, atherectomy is widely used in the treatment of breast lesions, varicose veins, etc. Existing ultrasound-guided breast vacuum minimally invasive atherectomy requires that the atherectomy needle can meet the requirements of relatively superficial surgical tasks.

[0037] In the prior art, the power component 300 needs to be repeatedly disassembled and assembled with the shell to meet the needs of replacing consumables of the shell 100. During the replacement process, it is necessary to ensure effective transmission connection between the power source and the screw shaft 210 and the gear shaft 220 in the shell 100 to ensure safe use and convenient installation. However, in the prior art, the connection between the power source and the screw shaft 210 and the gear shaft 220 in the shell 100 is unstable. For example, the installation gap causes a lag in the transmission process. When the installation gap is effectively controlled, it will cause difficulty in disassembly and assembly.

[0038] In order to solve the above technical problems, the present embodiment provides a rear end connection structure of the screw shaft 210 and the gear shaft 220 of the rotary cutting needle handle, so as to facilitate the installation between the power component 300 and the screw shaft 210 and the gear shaft 220 in the outer shell, and the connection stability between the power source and the screw shaft 210 and the gear shaft 220 in the shell 100 is relatively high.

[0039] In this embodiment, a sleeve shaft 310 is provided in the power component 300, one end of the sleeve shaft 310 is connected to the power output end of the power source, such as the output shaft of a motor. When the power component 300 needs to be installed and connected with the shell 100, the power component 300 needs to be placed at the rear end position of the shell 100 first, that is, the power component 300 is located at the end position of the screw shaft 210 and the gear shaft 220, and then the power component 300 is pushed along the axial direction of the screw shaft 210 and the gear shaft 220 and toward the shell 100, so that the power component 300 can be quickly engaged with the shell 100. The engaging structure can adopt the quick connection engaging structure in the prior art, which can realize a stable connection between the power component 300 and the shell 100, and is convenient. The two sleeve shafts 310 in the power assembly 300 are also respectively connected to the screw shaft 210 and the gear shaft 220 of the transmission assembly 200 during the engagement connection between the power assembly 300 and the housing 100. Furthermore, a plum blossom groove 320 is provided at one end of the sleeve shaft 310 relative to the screw shaft 210 and the gear shaft 220. Of course, a connecting portion 230 is also provided at the end of the screw shaft 210 and the gear shaft 220. The connecting portion 230 is a cylindrical body 311 structure, and a plurality of connecting grooves 240 are provided on the side of the connecting portion 230, so that the end surface of the connecting portion 230 is plum blossom-shaped, and the connecting portion 230 is adapted to the plum blossom groove 320, so that during the relative movement between the sleeve shaft 310 and the housing 100, the connecting portion 230 is inserted into the plum blossom groove 320. The interior of the flower groove 320 realizes the effective connection between the two sleeve shafts 310 and the screw shaft 210 and the gear shaft 220 respectively. When the power source is started, the power source can drive the two sleeve shafts 310 to rotate respectively, and the two sleeve shafts 310 can drive the corresponding screw shaft 210 and the gear shaft 220 to rotate respectively. The whole installation process is convenient and fast. Due to the relative movement guidance of the housing 100 and the power assembly 300, the sleeve shaft 310 can correspond to the position of the corresponding screw shaft 210 and the gear shaft 220, and can be quickly plugged in. The structure of the plum blossom groove 320 is similar to the spline groove design, so that during the rotation of the sleeve shaft 310, the effective transmission contact area of ​​the sleeve shaft 310 with the corresponding screw shaft 210 and the gear shaft 220 is increased, the transmission stability is high, and it can avoid There is a relative rotation problem between the sleeve shaft 310 and the connecting part 230 corresponding to the screw shaft 210 and the gear shaft 220, and the installation is convenient and quick. Since the connecting part 230 has multiple connecting grooves 240 that are compatible with the inner wall of the plum blossom groove 320, even if there is an installation gap in some positions, as long as at least one of the connecting grooves 240 effectively connects the sleeve shaft 310 and ensures that the sleeve shaft 310 is coaxial with the screw shaft 210 and the gear shaft 220, the power source can be stably connected and transmitted with the screw shaft 210 and the gear shaft 220 in the housing 100. Of course, when all the connecting grooves 240 have better adaptability to the sleeve shaft 310, the service life of the transmission connection will be longer and the ability to withstand the stress of the transmission process will be stronger. In other embodiments,The notch at the end of the sleeve shaft 310 can be in a conventional optional shape other than the plum blossom shape, as long as it can provide a more effective contact surface between the sleeve shaft 310 and the power assembly 300, ensure stable transmission and convenient installation, all of which are within the scope of protection of this application and are not limited thereto.

[0040] In one embodiment, the specific structure of the connecting groove 240 is as follows: a plurality of connecting grooves 240 are located on the side of the connecting portion 230, preferably evenly distributed. Further, the connecting groove 240 extends from the end of the connecting portion 230 toward the housing 100, and continuously moves away from the axis of the connecting portion 230 during the extension process, so that the connecting groove 240 is inclined along the axis of the connecting portion 230. When the connecting portion 230 is inserted into the hexalobular groove 320 of the sleeve shaft 310, the inclined connecting groove 240 can play a guiding role. If the coaxiality and dimensional accuracy between the connecting portion 230 and the sleeve shaft 310 are both high, the connecting portion 230 is just inserted into the hexalobular groove 320 of the sleeve shaft 310. When the connecting portion 230 is inserted into the hexalobular groove 320, the connecting groove 240 on the connecting portion 230 is not in contact with the corresponding position surface of the sleeve shaft 310. As the connecting portion 230 is further inserted into the hexalobular groove 320, the inclined connecting groove 240 on the connecting portion 230 is finally in contact with the corresponding position surface of the sleeve shaft 310, so that the connecting portion 230 and the sleeve shaft 310 are contacted and connected with each other; if the coaxiality and dimensional accuracy between the connecting portion 230 and the sleeve shaft 310 are relatively low, when the connecting portion 230 is just inserted into the hexalobular groove 320 of the sleeve shaft 310, the connecting portion 230 will be biased to one side of the hexalobular groove 320, thereby making the connecting portion 230 just inserted into the hexalobular groove 320 or the connecting portion 230 inserted into the hexalobular groove The connecting portion 230 will soon come into direct contact with the side wall of the hexalobular groove 320. As the connecting portion 230 is further inserted into the hexalobular groove 320, the connecting portion 230 is subjected to the force of the hexalobular groove 320, so that the connecting portion 230 or the sleeve shaft 310 is reset and deformed, and the original position deviation is compensated, and finally the connecting portion 230 and the sleeve shaft 310 are ensured to maintain a high coaxial accuracy and connection contact effect. In addition to achieving a good connection effect, the inclined connecting groove 240 also plays a guiding role, making it easier to install the connecting portion 230 and the sleeve shaft 310, and avoiding the inability of the connecting portion 230 to be quickly and effectively inserted into the sleeve shaft when the deviation of the connecting portion 230 or the sleeve shaft 310 is large. The problem of the hexagram groove 320 of the shaft 310 is improved, and the installation efficiency is improved; further, at the connection contact position between the connecting part 230 and the shell 100, the connecting groove 240 has stopped extending, which can be further understood as that the connecting groove 240 will not directly contact the shell 100. Therefore, on the one hand, when the connecting part 230 is inserted into the sleeve shaft 310, the sleeve shaft 310 will not directly touch the shell 100, affecting the movement of the transmission assembly 200. On the other hand, when the screw shaft 210 and the gear shaft 220 rotate inside the shell 100, the connecting groove 240 will not directly contact the shell 100, so as to avoid the connecting groove 240 affecting the rotation of the screw shaft 210 and the gear shaft 220.

[0041] In one embodiment, by providing a first inclined surface 250 at the end of the connecting portion 230, the first inclined surface 250 can guide the side surface of the connecting portion 230 except the connecting groove 240 near the end surface, and cooperate with the guiding function of the inclined connecting groove 240 to better achieve a better guiding effect in the initial stage of the connecting portion 230 being introduced into the opening of the plum blossom groove 320, so that the housing 100 and the power assembly 300 can be assembled more conveniently and quickly, and during the assembly process, the sleeve shaft 310 and the transmission assembly 200 can also be connected more smoothly and quickly;

[0042] Furthermore, by designing the sleeve shaft 310 as a whole as a column 311, a plum blossom groove 320 is provided at the end of the column 311, and the plum blossom groove 320 is specifically a circular groove 321 and ribs 322 arranged evenly on the inner side of the circular groove 321, so that the notch of the plum blossom groove 320 also forms a plum blossom-like structure, which can be further understood as being similar to a spline groove, so that the plum blossom groove 320 of the sleeve shaft 310 is adapted to the connecting portion 230. During the connection process, the ribs 322 of the sleeve shaft 310 will be correspondingly inserted into the connecting groove 240 of the connecting portion 230, so as to achieve a stable connection between the sleeve shaft 310 and the connecting portion 230. Furthermore, the plum blossom groove 320 includes the circular groove 321 and the ribs 322. 22, a circular groove 321 is extended from the end of the sleeve shaft 310 toward the inside of the sleeve shaft 310, and a rib 322 is provided on the side of the circular groove 321, preferably, the ribs 322 are evenly arranged along the side of the circular groove 321, so that the rib 322 corresponds to the connecting groove 240, and a second inclined surface 323 is provided through the notch of the circular groove 321, and a preset distance is left between the end of the rib 322 and the notch of the circular groove 321, and a third inclined surface 324 is provided at the end of the rib 322, so that when the connecting portion 230 is inserted into the hexalobular groove 320, the first inclined surface 250 of the connecting portion 230 corresponds to the second inclined surface 323 to play a guiding role, and as the connecting portion 230 is further inserted into the hexalobular groove 32 0, at this time, the third inclined surface 324 of the rib 322 will be close to or in contact with the inclined connecting groove 240, playing a further guiding role. During the entire connection process, the multiple corresponding structures are not installed and contacted in a consistent manner, but are guided step by step and then connected, so that the entire connection process between the connecting portion 230 and the sleeve shaft 310 is smoother. Further, the third inclined surface 324 at the end position of the rib 322 can be an inclined plane, or it can be an arc surface with smooth transitions in multiple directions instead of an inclined plane. When the rib 322 and the connecting groove 240 are slightly misaligned, in addition to the overall distribution center of the multiple ribs 322 and the overall distribution center of the multiple connecting grooves 240, The centers are not collinear in the early stage of the installation process, resulting in misalignment. The misalignment is not mainly caused by size reasons, but is caused by the connection part 230 and the sleeve shaft 310 not being aligned. It also includes misalignment between the connection part 230 and the sleeve shaft 310 along the axial rotation direction, but is not limited to this. This eventually leads to misalignment between the rib 322 and the connecting groove 240. At this time, the third inclined surface 324 on the rib 322, that is, the smooth arc surface, plays a guiding role in multiple directions, ensuring that the ribs 322 and connecting grooves 240 that are misaligned in all directions can be guided by the third inclined surface 324, ensuring that the ribs 322 and connecting grooves 240 can be guided and installed more smoothly.

[0043] In one embodiment, a first connecting frame 110 and a second connecting frame 120 are provided on the shell 100. The first connecting frame 110 and the second connecting frame 120 can be assembled or integrally formed with the shell 100, and there are two first connecting frames 110 and two second connecting frames 120. The two first connecting frames 110 are distributed near the two end positions of the screw shaft 210, and the two second connecting frames 120 are distributed near the two end positions of the gear shaft 220. The screw shaft 210 can rotate on the first connecting frame 110, and the gear shaft 220 can rotate on the second connecting frame 120. Further, a first mounting groove 111 is provided on the first connecting frame 110, and a second mounting groove 121 is provided on the second connecting frame 120. The screw shaft 210 can rotate inside the first mounting groove 111, and the gear shaft 220 can rotate inside the gear shaft 220. The axle 220 can rotate inside the second mounting groove 121. Under the conventional setting conditions, the screw shaft 210 and the gear shaft 220 both rotate along various axes. Further, near the position of the connecting groove 240, the connecting part 230 and the first mounting groove 111 are rotationally connected to each other, or the connecting part 230 and the second connecting groove 240 are rotationally connected to each other. The connecting groove 240 is an end of the connecting part 230 extending toward the first mounting groove 111 or the second mounting groove 121, and terminates before the position of the first mounting groove 111 or the second mounting groove 121. It can be further understood that the connecting groove 240 does not directly contact the first mounting groove 111 or the second mounting groove 121 to ensure that the connecting groove 240 will not affect the rotational connection between the connecting part 230 and the shell 100.

[0044] In one embodiment, the screw shaft 210 is generally made of metal material, while the gear shaft 220 is mostly made of plastic. The reason is that the surface of the screw shaft 210 has threads and is adapted to the slider on its surface. The sliding of the slider is controlled by the rotation of the screw shaft 210, so the stress on the surface of the screw shaft 210 will be more complicated. The strength, hardness and wear resistance of the screw shaft 210 are relatively high. Therefore, the screw shaft 210 is made of metal, which can ensure the service life and the transmission stability of the rotating needle during use. When the metal screw shaft 210 rotates inside the first mounting groove 111, the strength and wear resistance of the screw shaft 210 are high. Therefore, the first mounting groove 111 is open at the top, and the side surface is through along the axial direction of the screw shaft 210. The screw shaft 210 can be directly placed in the first mounting groove 111 through the opening, so that the two sides and the bottom of the screw shaft 210 are supported, ensuring that the screw shaft 210 can rotate stably inside the first mounting groove 111;

[0045] As for the gear shaft 220, due to the use of other non-metallic materials to reduce costs and reduce the overall weight of the rotary cutting needle, the second mounting groove 121 is open at the top, and the side is through along the axial direction of the gear shaft 220. The gear shaft 220 can be directly placed in the second mounting groove 121 through the opening, so that the two sides and the bottom of the gear shaft 220 are supported, ensuring that the gear shaft 220 can rotate stably inside the second mounting groove 121; further, in order to increase the service life of the gear shaft 220, or to ensure the transmission accuracy of the gear shaft 220 during use, or to ensure that the end position of the gear shaft 220 can withstand relatively greater stress, etc., By arranging a rotating ring 123 on the surface of the gear shaft 220, the end of the gear shaft 220 can pass through the rotating ring 123 and contact the inside of the third mounting groove 122, so as to prevent the gear shaft 220 from being directly worn when the gear shaft 220 rotates. Furthermore, by arranging the third mounting groove 122 inside the second mounting groove 121, the rotating ring 123 can be directly arranged inside the third mounting groove 122, and the third mounting groove 122 can also limit the rotating ring 123 along the axial direction of the gear shaft 220, thereby limiting the gear shaft 220 along its axial direction, and further improving the rotation stability of the gear shaft 220.

[0046] Furthermore, an annular groove 125 is provided on the arc side of the rotating ring 123, an O-ring 126 is provided inside the annular groove 125, and the O-ring 126 is generally made of wear-resistant rubber material, and a fourth mounting groove 124 is provided inside the third mounting groove 122, and the O-ring 126 is located inside the fourth mounting groove 124. When the gear shaft 220 rotates, the gear shaft 220 drives the rotating ring 123 and the O-ring 126 to rotate, thereby causing the rotating ring 123 to rotate inside the third mounting groove 122, and the O-ring 126 to rotate inside the fourth mounting groove 124. Preferably, the O-ring 126 contacts the fourth mounting groove 124 first, and the swivel 123 is supported by the O-ring 126, and a small gap is left between the swivel 123 and the third mounting groove 122. When the O-ring 126 is subjected to a large extrusion pressure, the O-ring 126 is deformed, and the swivel 123 and the third mounting groove 122 are in contact and limited. When the pressure is relatively small, the wear-resistant elastic O-ring 126 directly contacts the fourth mounting groove 124 in the second connecting frame 120, thereby ensuring the stable rotation and service life of the gear shaft 220.

[0047] In other embodiments, a pressing piece 130 is provided at the interior of the shell 100 and at the top position of the screw shaft 210 and the gear shaft 220. The pressing piece 130 can limit the screw shaft 210 and the gear shaft 220 so that the screw shaft 210 and the gear shaft 220 do not move up and down. In order to ensure quick installation, the shell 100 generally includes an upper shell and a lower shell. The lower shell has a first connecting frame 110 and a second connecting frame 120, and the transmission assembly 200, such as the screw shaft 210 and the gear shaft 220, is directly placed on the lower shell. After the installation of the power assembly 300 is completed, the power assembly 300 is wrapped in the interior of the shell 100 by covering the upper shell with the lower shell. The upper shell has a pressing piece 130. After the upper shell is installed, the screw shaft 210 and the gear shaft 220 are restricted, which makes the assembly between the power assembly 300 and the shell 100 more convenient.

[0048] In one embodiment, a first limit portion 112 is provided at the end position of the screw shaft 210, so that when the screw shaft 210 rotates, the screw shaft 210 will drive the slider on its surface to slide, and the slider will then drive the inner rotary cutting knife tube to move toward the rotary cutting side hole position of the end of the outer knife tube, and finally the slider will move to the farthest distance of its preset stroke. If the operator still continues to rotate at this time or the power source does not stop in time and continues to rotate, it will drive the screw shaft 210 to continue to rotate, and the screw shaft 210 will then drive the slider to continue to slide, and the slider will then drive the inner rotary cutting knife tube to continue to move, which will cause the limit structure at the maximum stroke position of the slider to be subjected to greater pressure, which will cause the slider or The limiting structure matched with the slider or the inner rotary cutter tube or the screw shaft 210 is damaged. Therefore, in order to protect the above structure, a first limiting portion 112 can be set at the end of the screw shaft 210, so that the screw shaft 210 can slide along the axial direction of the screw shaft 210 within a preset range of motion on the first connecting frame 110, and a spring 113 is set between the screw shaft 210 and the first connecting frame 110. When the screw shaft 210 drives the slider on its surface to slide to the maximum stroke position, the slider will be blocked by the limiting structure, so that the slider stops sliding. If the screw shaft 210 continues to rotate, the slider in the fixed state will hit the screw The shaft 210 generates a reverse force, which causes the screw shaft 210 to rotate and slide in the reverse direction at the same time. The reverse direction can be further understood as: the opposite direction of the direction before the slider stops moving. Therefore, the reverse direction when cutting the diseased tissue is toward the rear end of the rotary cutting needle, that is, the screw shaft 210 is toward the sleeve shaft 310. After the diseased tissue is cut, the slider is reset to the maximum stroke. At this time, the screw shaft 210 is subjected to a reverse force, and the reverse direction is the screw shaft 210 toward the outer knife tube. Take the cutting of diseased tissue as an example: the slider slides to the maximum stroke position. At this time, the screw shaft 210 continues to rotate. Under the reaction force, the screw shaft 210 will be in the first connecting frame 110 slides toward the sleeve shaft 310. As the spring 113 is continuously squeezed, the movement of the screw shaft 210 is blocked. At this time, the sensor inside the power source will receive a pressure signal to control the power source to stop in time, or the staff can manually control it directly. When resistance is felt, the rotation of the screw shaft 210 can be stopped in time. The sliding design of the screw shaft 210 ensures the braking stroke. Even when the screw shaft 210 stops rotating, the screw shaft 210 continues to rotate under the action of inertia, or the rotation control of the screw shaft 210 is not stopped in time, the reverse movement of the screw shaft 210 will protect the transmission mechanism where the entire screw shaft 210 is located.

[0049] In one embodiment, a second limit portion 127 is provided on the gear shaft 220, and the second limit portion 127 abuts against the second connecting frame 120, thereby further limiting the sliding of the gear shaft 220 along its axis and ensuring the stability of the gear shaft 220. It should be emphasized that when the slider moves to the maximum position of the movement stroke, it will not affect the normal rotation of the inner rotary cutting knife tube driven by the gear shaft 220. Therefore, for the gear shaft 220, the main thing is to limit the other degrees of freedom of the gear shaft 220 except for its own rotation to ensure the stable rotation of the gear shaft 220.

[0050] A rotary cutting needle adopts a rear end connection structure of a rotary cutting needle handle screw shaft and a gear shaft to achieve safer and more stable rotary cutting work of the rotary cutting needle.

[0051] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. The rear end connection structure of the rotary cutting needle handle screw shaft and the gear shaft is characterized in that: include: case; A transmission assembly is installed inside the housing, the transmission assembly includes a screw shaft and a gear shaft, the rear ends of the screw shaft and the gear shaft are both provided with a connecting portion, and the connecting portion passes through the rear end surface of the housing and extends to the outside of the housing, and the side surface of the connecting portion is provided with evenly arranged connecting grooves; A power assembly is mounted on the housing, a sleeve shaft is provided inside the power assembly, and a plum blossom groove matching the connecting portion is provided on the sleeve shaft, which is suitable for a power source to drive the corresponding screw shaft or the gear shaft through the sleeve shaft.

2. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 1, characterized in that: The connecting groove extends from the end of the connecting portion toward the shell, and the connecting groove continuously moves away from the axis of the connecting portion during the extension toward the shell, so that the connecting groove stops extending before the connection contact position between the connecting portion and the shell.

3. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 2, characterized in that: The end position of the connecting portion has a first inclined surface; The connection position between the sleeve shaft and the connecting part is a column, and the column is provided with the plum blossom groove relative to one end of the connecting part, and the plum blossom groove includes a circular groove and ribs, and the circular groove is adapted to the connecting part, and a plurality of ribs are provided inside the circular groove, and the ribs are adapted to the connecting groove; A second inclined surface is provided at the notch position of the circular groove, an end of the rib is close to the notch of the circular groove, and a third inclined surface is provided at the notch position of the rib close to the notch of the circular groove.

4. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 1, characterized in that: The shell is provided with a first connecting frame and a second connecting frame, the first connecting frame is provided with a first mounting groove, the rotation of the screw shaft is connected to the inside of the first mounting groove, the second connecting frame is provided with a second mounting groove, the rotation of the gear shaft is connected to the inside of the second mounting groove; the connecting groove terminates and extends before the connection position between the connecting portion and the first mounting groove or the second mounting groove.

5. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 4, characterized in that: The screw shaft is made of metal material, the first mounting groove has an opening at the top, the first mounting groove is through along the axial direction of the screw shaft, and is suitable for the position near the end of the screw shaft to be placed in the first mounting groove through the opening of the first mounting groove, and the first mounting groove can support the side and bottom surfaces of the position near the end of the screw shaft; The second mounting groove has an opening at the top, and the second mounting groove passes through along the axial direction of the gear shaft, and is suitable for a position near the end of the gear shaft to be placed in the second mounting groove through the opening of the second mounting groove.

6. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 5, characterized in that: A third mounting groove is provided inside the second mounting groove, and a swivel is provided near the end of the gear shaft. The swivel is rotatably connected to the inside of the third mounting groove, and the second mounting groove and the third mounting groove can jointly support the side and bottom surfaces near the end of the gear shaft.

7. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 6, characterized in that: A fourth mounting groove is provided inside the third mounting groove, an annular groove is provided on the surface of the rotating ring, an O-ring is provided inside the annular groove, and the O-ring is adapted to the fourth mounting groove; A pressing piece is provided inside the housing at the top of the screw shaft and the gear shaft, which is suitable for pressing the screw shaft or the gear shaft respectively to limit the upward and downward movement of the screw shaft and the gear shaft.

8. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 7, characterized in that: A first limiting portion is provided at the end position of the screw shaft, and a movable gap is preset between the first limiting portion and the first connecting frame, suitable for the screw shaft to slide inside the first mounting groove along the axial direction of the screw shaft, and a spring is provided between the screw shaft and the first connecting frame.

9. The rear end connection structure of the screw shaft and the gear shaft of the rotary cutting needle handle according to claim 8, characterized in that: The gear shaft is provided with a second limiting portion, which abuts against the second connecting frame and is suitable for limiting the sliding between the gear shaft and the second connecting frame along the axial direction of the gear shaft.

10. A rotary cutting needle, comprising the rear end connection structure of the rotary cutting needle handle screw shaft and the gear shaft according to any one of claims 1 to 9.

Images