Uterine cavity tissue cutter

Abstract

The utility model relates to a uterine cavity tissue cutter. The uterine cavity tissue cutter comprises an outer cutter assembly, an inner cutter assembly and a cutter handle assembly. The outer cutter assembly comprises an outer cutter shaft and an outer cutter pipe arranged on the outer cutter shaft in a protruding mode. The inner cutter assembly comprises an inner cutter shaft and an inner cutter pipe arranged on the inner cutter shaft in a protruding mode, and the inner cutter pipe is movably arranged in the outer cutter pipe in a penetrating mode; the knife handle assembly comprises an outer knife handle body and an outer knife fixing piece which is detachably connected with the outer knife handle body and the outer knife shaft; the outer knife handle body comprises an outer knife connecting part and an inner knife connecting part which are integrally arranged, the outer knife shaft is movably sleeved in the outer knife connecting part, the inner knife shaft is arranged in the inner knife connecting part, and the outer knife fixing piece is detachably connected with the outer knife connecting part and the outer knife shaft. The problems that in the prior art, a front-back reciprocating uterine cavity tissue cutter cannot be detached, and the disposable use cost is high can be solved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a uterine tissue cutter. Background Technology

[0002] Intrauterine tissue cutters are used in gynecological surgeries to remove uterine fibroids and endometrial polyps. Traditionally, medical intrauterine tissue cutters consist of an inner blade assembly and an outer blade assembly. The outer blade assembly typically includes an outer blade tube and a fixing element for securing it. The front end of the outer blade tube has an outer cutting window with an outer cutting edge. The inner blade assembly typically includes an inner blade tube, a spiral shaft, a guide block, an inner blade handle, and an inner blade fixing element. The front end of the inner blade tube has an inner cutting window with an inner cutting edge at its tip. The spiral shaft has reversible spiral grooves. The inner blade holder drives the spiral shaft to rotate unidirectionally. Driven by the guide block, the rotating spiral shaft drives the inner blade tube to rotate unidirectionally while simultaneously reciprocating. This unidirectional rotation and reciprocating motion of the inner blade tube is relative to the stationary outer blade tube. The relative movement of the moving inner cutting window and the stationary outer cutting window cuts the tissue inserted into the outer cutting window and draws the tissue into the inner cutting window. A vacuum system then removes the debris, achieving the purpose of cutting and expelling it from the body. However, traditional reciprocating uterine tissue cutters are disposable, non-removable, and cannot be cleaned, disinfected, or sterilized. Furthermore, their complex structure and high cost make single-use a significant financial burden for patients. Utility Model Content

[0003] This invention provides a uterine tissue cutter that solves the technical problems of traditional reciprocating uterine tissue cutters being non-removable and having high disposable costs.

[0004] To solve the above-mentioned technical problems, this utility model provides a uterine tissue cutter, comprising:

[0005] An outer cutter assembly includes an outer cutter shaft and an outer cutter tube protruding from the outer cutter shaft;

[0006] An inner cutter assembly includes an inner cutter shaft and an inner cutter tube protruding from the inner cutter shaft, the inner cutter tube being movably inserted into the outer cutter tube; and,

[0007] A tool holder assembly includes an outer tool holder body and an outer tool holder fixing member that is detachably connected to the outer tool holder body and the outer tool shaft;

[0008] The outer tool holder body includes an integrally formed outer tool connecting part and an inner tool connecting part. The outer tool shaft is movably sleeved in the outer tool connecting part, and the inner tool shaft is disposed in the inner tool connecting part. The outer tool fixing member is detachably connected to the outer tool connecting part and the outer tool shaft.

[0009] Optionally, the outer blade fixing member includes a connecting sleeve detachably sleeved on the outer blade connecting part, and an outer shaft limiting part for axially limiting the outer blade shaft.

[0010] Optionally, the outer cutter shaft includes an outer tube connecting shaft connected to the outer cutter tube, and a fixing member connecting shaft integrally formed with the outer tube connecting shaft, wherein the outer diameter of the fixing member connecting shaft is larger than the outer diameter of the outer tube connecting shaft;

[0011] The outer shaft limiting part includes an annular limiting plate extending radially along the inner wall of the connecting sleeve, and the annular limiting plate is positioned at the shoulder where the outer tube connecting shaft and the fixing member connecting shaft connect.

[0012] Optionally, the outer blade connecting part is threadedly connected to the connecting sleeve.

[0013] Optionally, the outer peripheral surface of the connecting sleeve is provided with a plurality of sleeve protrusions extending axially.

[0014] Optionally, a circumferential limiting structure is provided between the outer cutter shaft and the outer cutter connecting part;

[0015] The circumferential limiting structure includes a fixed limiting protrusion disposed axially on one of the outer peripheral surface of the outer cutter shaft and the inner wall surface of the outer cutter connection part, and a limiting groove disposed axially on the other of the two, wherein the fixed limiting protrusion is movably engaged in the limiting groove.

[0016] Optionally, the outer tool holder body includes an annular outer tool holder plate protruding from the outer peripheral surface of the outer tool connecting part, and an outer tool holder protrusion protruding from the outer tool holder plate. The outer tool holder protrusion, the outer cutting window of the outer tool tube, and the positioning protrusion are all arranged on the same straight line.

[0017] Optionally, an annular inner limiting baffle protrudes from the inner wall of the outer tool holder, and a sealing ring is provided between the end of the outer tool shaft and the side of the inner limiting baffle.

[0018] Optionally, the front end of the inner blade tube is provided with an inner cutting window, the end face of the inner cutting window is provided with an inner cutting edge, and the inner cutting edge is an inner chamfered structure.

[0019] Optionally, the front end of the outer tool tube is provided with an outer cutting window, and the inner cutting window at the front end of the inner tool tube is located at the outer cutting window;

[0020] The sidewall of the outer cutting window is provided with an outer cutting edge, which is an outer chamfered structure.

[0021] The beneficial effects of the technical solution provided by this utility model include:

[0022] The outer handle body and outer blade fixing component of the blade handle assembly are detachably connected to the outer blade shaft of the outer blade assembly, enabling a detachable connection between the outer and inner blade assemblies. Specifically, the inner blade connecting part of the outer handle body can be connected to the inner blade shaft of the inner blade assembly; while the outer blade connecting part of the outer handle body can be movably connected to the outer blade shaft of the outer blade assembly, and the outer blade fixing component can detachably connect the outer blade connecting part and the outer blade shaft together. By disassembling the outer blade fixing component, the inner blade assembly can be separated from the outer blade shaft and outer blade tube of the outer blade assembly. This allows for cleaning, disinfection, and sterilization of both the inner and outer blade assemblies, enabling the uterine tissue cutter to be reused, reducing usage costs and alleviating the financial burden on patients. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a simplified three-dimensional structural diagram of the uterine tissue cutter described in an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a simplified three-dimensional structural diagram of the uterine tissue cutter described in an embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is a three-dimensional structural diagram of the outer blade assembly and inner blade assembly of the uterine tissue cutter described in this embodiment of the present invention during disassembly.

[0027] Figure 4 This is an exploded view of the handle assembly of the uterine tissue cutter according to an embodiment of the present invention. Figure 1 ;

[0028] Figure 5 This is an exploded view of the handle assembly of the uterine tissue cutter according to an embodiment of the present invention. Figure 2 ;

[0029] Figure 6 This is a cross-sectional view of the handle assembly of the uterine tissue cutter according to an embodiment of the present invention.

[0030] Figure 7 This is a three-dimensional structural diagram of the front end portion of the uterine tissue cutter described in an embodiment of the present invention;

[0031] Figure 8 This is an exploded structural diagram of the front end portion of the uterine tissue cutter described in an embodiment of the present invention.

[0032] In the diagram: 10. Uterine tissue cutter; 100. External blade assembly; 110. External blade shaft; 112. External tube connecting shaft; 114. Fixing member connecting shaft; 1142. Positioning and limiting protrusion; 120. External blade tube; 122. External cutting window; 1222. External cutting edge; 200. Internal blade assembly; 210. Internal blade shaft; 212. Internal tube connecting shaft; 214. External handle connecting shaft; 220. Internal blade tube; 222. Internal cutting window; 2 222. Internal cutting edge; 300. Tool holder assembly; 310. Outer tool holder body; 312. Outer tool connecting part; 3122. Outer tool holder plate; 3124. Outer tool holder protrusion; 3126. Limiting groove; 3128. Inner limiting baffle; 314. Inner tool connecting part; 320. Outer tool fixing part; 322. Connecting sleeve; 324. Outer shaft limiting part; 3224. Annular limiting plate; 3226. Sleeve protrusion; 330. Sealing ring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] like Figures 1 to 3 As shown, this utility model proposes a uterine tissue cutter 10, including an outer blade assembly 100, an inner blade assembly 200 corresponding to the outer blade assembly 100, and a handle assembly 300 that detachably connects the outer blade assembly 100 and the inner blade assembly 200. The handle assembly 300 allows for the installation and removal of the outer blade assembly 100 and the inner blade assembly 200, facilitating cleaning, disinfection, and sterilization of both components. This allows the instrument to be reused, reducing operating costs and alleviating the financial burden on users.

[0035] Specifically, such as Figures 4 to 6As shown, the outer blade assembly 100 may include an outer blade shaft 110 and an outer blade tube 120 protruding from the outer blade shaft 110. Furthermore, the inner blade assembly 200 may include an inner blade shaft 210 and an inner blade tube 220 protruding from the inner blade shaft 210, with the inner blade tube 220 movably passing through the outer blade tube 120. Moreover, the blade holder assembly 300 may include an outer blade holder body 310 and an outer blade fixing member 320 detachably connecting the outer blade holder body 310 and the outer blade shaft 110. The outer blade holder body 310 may include an integrally formed outer blade connecting portion 312 and an inner blade connecting portion 314. The outer blade shaft 110 is movably sleeved within the outer blade connecting portion 312, the inner blade shaft 210 is disposed within the inner blade connecting portion 314, and the outer blade fixing member 320 is detachably connected to the outer blade connecting portion 312 and the outer blade shaft 110.

[0036] The outer shank body 310 and the outer blade fixing member 320 of the tool holder assembly 300 are detachably connected to the outer blade shaft 110 of the outer blade assembly 100, thereby enabling a detachable connection between the outer blade assembly 100 and the inner blade assembly 200. Specifically, the inner blade connecting portion 314 of the outer shank body 310 can be connected to the inner blade shaft 210 of the inner blade assembly 200; while the outer blade connecting portion 312 of the outer shank body 310 can be movably connected to the outer blade shaft 110 of the outer blade assembly 100, and the outer blade fixing member 320 can detachably connect the outer blade connecting portion 312 and the outer blade shaft 110 together. By disassembling the outer blade fixing component 320, the inner blade assembly 200 can be separated from the outer blade shaft 110 and outer blade tube 120 of the outer blade assembly 100. This allows the inner blade assembly 200 and the outer blade assembly 100 to be cleaned, disinfected, and sterilized, thus enabling the uterine tissue cutter 10 to be reused, reducing usage costs and alleviating the financial burden on patients.

[0037] Furthermore, the inner blade assembly 200's inner blade shaft 210 is rotatably disposed within the outer blade holder body 310 of the blade holder assembly 300, allowing the inner blade assembly 200 to rotate relative to the outer blade holder body 310. Moreover, the inner blade shaft 210 may include an integrally formed inner tube connecting shaft 212 and an outer blade connecting shaft 214, with the outer diameter of the outer blade connecting shaft 214 being larger than the outer diameter of the inner tube connecting shaft 212, thus forming a stepped shaft structure for the inner blade shaft 210. The rear end of the inner tube 220 is located in the shaft hole cavity of the inner tube connecting shaft 212, and the front end of the inner tube 220 protrudes from the outside of the inner tube connecting shaft 212 and passes through the shaft hole cavity of the outer tube 110 and the tube cavity of the outer tube 120. The inner tube 210 can be located in the inner cavity of the inner tube connecting part 314 of the outer tube shank body 310, and the outer shank connecting shaft 214 of the inner tube 210 can be rotatably connected to the inner tube connecting part 314 of the outer tube shank body 310. There is a gap between the outer peripheral surface of the inner tube connecting shaft 212 of the inner tube 210 and the inner wall surface of the inner tube connecting part 314 of the outer tube shank body 310.

[0038] Furthermore, the outer shank connecting shaft 214 of the inner cutter shaft 210 can be threadedly connected to the inner cutter connecting portion 314 of the outer cutter shank body 310, or it can be connected with a clearance fit, thus enabling a detachable connection between the inner cutter assembly 200 and the cutter shank assembly 300. In addition, the rear end of the inner cutter tube 220 can be embedded in the shaft hole of the inner tube connecting shaft 212 of the inner cutter shaft 210, connecting the inner cutter tube 220 and the inner cutter shaft 210 into one unit.

[0039] Furthermore, the outer tool fixing member 320 of the tool holder assembly 300 may include a connecting sleeve 322 detachably sleeved on the outer tool connecting portion 312, and an outer shaft limiting portion 324 for axially limiting the outer tool shaft 110 and the outer tool connecting portion 312. The connecting sleeve 322 of the outer tool fixing member 320 can be detachably connected to the outer tool connecting portion 312 of the outer tool holder body 310, limiting the outer tool holder body 310 and the outer tool shaft 110 circumferentially and axially. The outer shaft limiting portion 324 of the outer tool fixing member 320 can limit the outer tool holder body 310 and the outer tool shaft 110 axially, thus detachably connecting the outer tool holder body 310 and the outer tool shaft 110 together, thereby realizing the detachable connection between the inner tool assembly 200 and the outer tool assembly 100.

[0040] Furthermore, the outer blade shaft 110 may include an outer tube connecting shaft 112 connected to the outer blade tube 120, and a fixing member connecting shaft 114 integrally formed with the outer tube connecting shaft 112. The fixing member connecting shaft 114 may be inserted into the outer blade connecting portion 312 of the outer blade holder body 310.

[0041] Furthermore, since the outer diameter of the fixing member connecting shaft 114 of the outer tool shaft 110 is larger than the outer diameter of the outer tube connecting shaft 112, the outer tool shaft 110 can be configured as a stepped shaft, facilitating the fitting of the connecting sleeve 322 onto the outer tool connecting portion 312 of the outer tool holder body 310 along the outer tool shaft 110. Moreover, the outer shaft limiting portion 324 may include an annular limiting plate 3224 extending radially along the inner wall of the connecting sleeve 322, which abuts at the shoulder where the outer tube connecting shaft 112 and the fixing member connecting shaft 114 meet. The annular limiting plate 3224 allows for axial limiting of both the fixing member connecting shaft 114 and the outer tool connecting portion 312 of the outer tool holder body 310 from the end face (i.e., the shoulder position) of the fixing member connecting shaft 114 of the outer tool shaft 110.

[0042] Furthermore, the fixing member connecting shaft 114 of the outer tool shaft 110 may include an inner connecting shaft section passing through the connecting sleeve 322 and an outer connecting shaft section located outside the connecting sleeve 322, the outer connecting shaft section being connected to the outer tube connecting shaft 112. The outer diameter of the inner connecting shaft section is smaller than the outer diameter of the outer connecting shaft section, meaning the fixing member connecting shaft 114 can also be configured as a stepped shaft. The outer tool connecting portion 312 of the outer tool holder body 310 can be sleeved on the inner connecting shaft section, and the outer diameter of the outer tool connecting portion 312 can be the same as the outer diameter of the outer connecting shaft section. The connecting sleeve 322 is simultaneously sleeved on both the outer tool connecting portion 312 of the outer tool holder body 310 and the outer connecting shaft section of the fixing member connecting shaft 114 of the outer tool shaft 110, and the connecting sleeve 322 is detachably connected to both the outer tool connecting portion 312 and the outer connecting shaft section. That is, the outer shaft limiting portion 324 may include a detachable connection structure between the connecting sleeve 322 and the outer connecting shaft section.

[0043] Furthermore, the outer tool connecting portion 312 of the outer tool holder body 310 can be threadedly connected to the connecting sleeve 322 of the outer tool fixing member 320, thus achieving a detachable connection between the outer tool connecting portion 312 and the connecting sleeve 322 through a threaded connection. Specifically, an external thread can be provided on the outer circumferential surface of the outer tool connecting portion 312, and an internal thread can be provided on the inner wall surface of the connecting sleeve 322 to achieve a threaded connection between the two. Similarly, when the outer shaft limiting portion 324 is provided as a detachable connection structure, this detachable connection structure can also be provided as a threaded connection structure.

[0044] Furthermore, the outer blade connecting portion 312 of the outer blade holder body 310 can be snapped together with the connecting sleeve 322 of the outer blade fixing member 320, thus achieving a detachable connection between the outer blade connecting portion 312 and the connecting sleeve 322 via a threaded connection. Specifically, a rotating snap can be provided on one of the outer peripheral surface of the outer blade connecting portion 312 and the inner wall surface of the connecting sleeve 322, and a rotating groove can be provided on the other, achieving a snap-fit ​​connection between the two by rotation.

[0045] In addition, the outer peripheral surface of the connecting sleeve 322 of the outer blade fixing member 320 is provided with a plurality of sleeve protrusions 3226 extending axially. By providing a plurality of sleeve protrusions 3226 on the outer peripheral surface of the connecting sleeve 322, the connecting sleeve 322 forms a toothed structure, which facilitates its rotational operation.

[0046] In addition, a circumferential limiting structure is provided between the outer tool shaft 110 and the outer tool connecting part 312. That is, a circumferential limiting structure is provided between the fixing connecting shaft 114 of the outer tool shaft 110 and the outer tool connecting part 312 of the outer tool holder body 310, which can not only position the two, but also limit the two in the circumferential direction to prevent relative rotation between the two.

[0047] Furthermore, the circumferential limiting structure may include a positioning protrusion 1142 axially disposed on one of the outer peripheral surface of the fixing connecting shaft 114 of the outer tool shaft 110 and the inner wall surface of the outer tool connecting portion 312, and a limiting groove 3126 axially disposed on the other of the two, with the positioning protrusion 1142 movably engaged in the limiting groove 3126. The axially extending positioning protrusion 1142 can engage with the axially extending limiting groove 3126, thereby limiting and positioning the outer tool shaft 110 and the outer tool connecting portion 312 in the circumferential direction. In addition, one pair or multiple pairs of positioning protrusions 1142 movably engaged in the limiting groove 3126 may be provided.

[0048] Furthermore, the positioning protrusion 1142 can be integrally formed with the outer peripheral surface of the fixing member connecting shaft 114 of the outer tool shaft 110 or the inner wall surface of the outer tool connecting part 312, that is, it can be formed by radially protruding from the outer peripheral surface of the fixing member connecting shaft 114 or the inner wall surface of the outer tool connecting part 312. In addition, a keyway can also be provided on the outer peripheral surface of the fixing member connecting shaft 114 or the inner wall surface of the outer tool connecting part 312, and the positioning protrusion 1142 can be set as a positioning key that is movably installed in the keyway.

[0049] Furthermore, an annular inner limiting baffle 3128 may protrude from the inner cavity wall of the outer tool holder body 310, and a sealing ring 330 is provided between the end of the outer tool shaft 110 and the side of the inner limiting baffle 3128. The annular inner limiting baffle 3128 protruding from the inner cavity of the outer tool holder body 310 can axially block and limit the movement of the outer tool shaft 110 from the end face of the fixing member connecting shaft 114; moreover, the sealing ring 330 between the end face of the fixing member connecting shaft 114 of the outer tool shaft 110 and the side of the inner limiting baffle 3128 can seal both, preventing air leakage. Additionally, the inner tool tube 220 of the inner tool assembly 200 can pass through the sealing ring 330 and extend into the outer tool tube 120.

[0050] Furthermore, the outer tool holder body 310 may include an annular outer tool holder plate 3122 protruding from the outer peripheral surface of the outer tool connecting portion 312, and an outer tool holder protrusion 3124 protruding from the outer tool holder plate 3122. The outer tool holder protrusion 3124, the outer cutting window 122 of the outer tool tube 120, and the positioning protrusion 1142 are all arranged on the same straight line. Moreover, the inner tool holder protrusion is usually also correspondingly matched with the outer tool holder protrusion 3124, which facilitates the positioning and alignment of the outer cutting window 122 and the inner tool holder, ensuring that the outer cutting window 122 and the inner tool holder protrusion are on the same line.

[0051] In addition, such as Figures 7 to 8As shown, the front end of the inner cutter tube 220 may be provided with an inner cutting window 222, and the end face of the inner cutting window 222 is provided with an inner cutting edge 2222, which has an inner chamfered structure. By setting the inner cutting edge 2222 with an inner chamfer, the cutting is sharper and it is also easier to guide the object to be cut into the inner cutter tube 220. When cutting an object, the inner cutter tube 220 drives the inner cutting edge 2222 to rotate and reciprocate back and forth. The inner cutting edge 2222 with an angle α can bring the cut object into the inner cutter tube 220 and suck the object out of the inner cutter tube 220.

[0052] Furthermore, the outer cutting tube 120 has an outer cutting window 122 at its front end, and the inner cutting window 222 at the front end of the inner cutting tube 220 is located at the outer cutting window 122. An outer cutting edge 1222 is provided on the side wall of the outer cutting window 122, and the outer cutting edge 1222 has an outward chamfered structure. By setting the outer cutting edge 1222 with an outward chamfer, it is easier to guide external objects into the outer cutting window 122, facilitating the cutting of the object by the inner cutting edge 2222 inside the outer cutting window 122.

[0053] In addition, the intrauterine tissue cutter 10 can be used with a planing handle. The planing handle is equipped with multiple steel balls. When the intrauterine tissue cutter 10 is inserted into the planing handle, the steel ball positioning groove on the intrauterine tissue cutter 10 is aligned with the steel balls on the planing handle. When the handle knob is loosened, the spring inside the handle knob can press multiple steel balls into the steel ball positioning groove of the intrauterine tissue cutter 10, thereby locking the intrauterine tissue cutter 10.

[0054] Furthermore, a drive motor is installed inside the planer handle, which can drive the motor shaft to rotate. The motor shaft meshes with the inner handle of the uterine tissue cutter 10, thereby driving the inner handle to rotate. The inner handle can drive the inner blade shaft 210, which meshes with it, to rotate. The rotating inner blade shaft 210 reciprocates back and forth under the push of the guide block. At the same time, the inner blade shaft 210 drives the inner blade tube 220 to perform unidirectional rotation and reciprocating back and forth motion, thereby generating relative motion with the outer blade tube 120 to achieve the cutting effect. The cut object can be sucked out through the inner cavity (i.e., suction channel) of the inner blade tube 220.

[0055] This invention provides a detachable and reusable reciprocating uterine tissue cutter 10, which can be used after multiple cleaning, disinfection and sterilization, increasing the number of uses and reducing the cost burden on patients; the structure of the inner blade tube 220 is optimized to improve cutting efficiency.

[0056] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the present invention.

Claims

1. An intrauterine tissue cutter, comprising: The utility model relates to a kind of outer cutter assemblies, including outer cutter shaft, and the outer cutter tube of protruding on the outer cutter shaft;Including inner cutter shaft, and the inner cutter tube of protruding on the inner cutter shaft, the inner cutter tube is movably arranged in the outer cutter tube;And,The utility model relates to a kind of handle assemblies, including outer cutter handle body, and the outer cutter fixing member of detachably connecting outer cutter handle body and outer cutter shaft;Wherein, the outer cutter handle body includes integrally arranged outer cutter connecting portion and inner cutter connecting portion, the outer cutter shaft is movably sleeved in the outer cutter connecting portion, the inner cutter shaft is arranged in the inner cutter connecting portion, and the outer cutter fixing member is detachably connected with the outer cutter connecting portion and the outer cutter shaft. The outer cutter fixing member includes detachably sleeved connecting sleeve on the outer cutter connecting portion, and outer shaft limiting portion for axially limiting the outer cutter shaft. The outer cutter shaft includes outer tube connecting shaft connected with the outer cutter tube, and fixing member connecting shaft integrally arranged with the outer tube connecting shaft, and the outer diameter of the fixing member connecting shaft is greater than the outer diameter of the outer tube connecting shaft. The outer shaft limiting portion includes annular limiting plate radially extending along the inner wall of the connecting sleeve, and the annular limiting plate is arranged at the shaft shoulder where the outer tube connecting shaft and the fixing member connecting shaft are connected. The outer cutter connecting portion is threadedly connected with the connecting sleeve. The outer periphery of the connecting sleeve is provided with a plurality of sleeve protrusions extending in the axial direction.

2. The uterine cavity tissue cutter according to claim 1, wherein, The outer cutter shaft and the outer cutter connecting portion are provided with circumferential limiting structure.

3. The uterine cavity tissue cutter according to claim 2, wherein, The circumferential limiting structure includes limiting protrusion arranged in one of the outer periphery of the outer cutter shaft and the inner wall surface of the outer cutter connecting portion in the axial direction, and limiting slot arranged in the other one in the axial direction, and the limiting protrusion is movably arranged in the limiting slot. The outer cutter handle body includes annular outer cutter handle plate protruding on the outer periphery of the outer cutter connecting portion, and outer cutter handle protrusion protruding on the outer cutter handle plate, and the outer cutter handle protrusion, the outer cutting window of the outer cutter tube and the limiting protrusion are arranged on the same straight line.

4. The uterine cavity tissue cutter according to claim 2, wherein, The inner limiting baffle is annularly protruding on the inner cavity wall of the outer cutter handle body, and a sealing ring is arranged between the end of the outer cutter shaft and the side surface of the inner limiting baffle.

5. The uterine cavity tissue cutter according to claim 2, wherein, The front end of the inner cutter tube is provided with inner cutting window, the end surface of the inner cutting window is provided with inner cutting edge, and the inner cutting edge is an inner chamfer structure.

6. The uterine cavity tissue cutter of any one of claims 1-5, wherein, The front end of the outer cutter tube is provided with outer cutting window, and the inner cutting window of the front end of the inner cutter tube is located at the outer cutting window. The side wall of the outer cutting window is provided with outer cutting edge, and the outer cutting edge is an outer chamfer structure.

7. The uterine cavity tissue cutter according to claim 6, wherein, ​ 8. The uterine cavity tissue cutter of any one of claims 1-5, wherein, ​ 9. The uterine cavity tissue cutter of any one of claims 1-5, wherein, ​ 10. The uterine cavity tissue cutter according to claim 9, wherein, ​ ​

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