Stitching instrument and outer tube assembly

Abstract

The utility model relates to a stitching instrument and an outer tube assembly. The outer tube assembly comprises an outer tube, a protection piece and a thread hook. A receding opening is formed in the side wall of the far end of the outer pipe. The protection part is arranged at the far end of the outer pipe and provided with a protection part, and a first receding concave part which is concavely arranged towards the outer portion of the outer pipe is formed in the inner wall of the protection part so that the protection part can protrude out of the outer pipe through the receding opening. The wire hook is rotatably disposed inside the distal end of the outer tube. When the thread hook rotates, more activity space is provided for the thread hook, and when the thread hook rotates to the thread hooking position, one end of the thread hook can move into the first avoiding concave part. Therefore, the size of the thread hook can be relatively increased, the thread hooking reliability and stability can be improved, and the suture thread is prevented from loosening. In addition, the structural strength can be improved, deformation is not prone to occurring when the device is stressed, and the material cost can be reduced. In addition, the protection part plays a role in protection, the thread hook can be prevented from being in contact with the tissue in the rotating process to scratch the tissue, and therefore safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to a stapler and an outer tube assembly. Background Art

[0002] Suturing is to align or reconstruct the channels of tissues and organs that have been incised or traumatized and fractured, so as to restore their functions. It is a basic condition for ensuring good healing and also one of the important basic surgical operation techniques. Different tissues and organs in different parts need to be sutured in different ways.

[0003] During the suturing process of the stapler in the related art, the suture is usually hooked by a wire hook to complete the suturing operation of tissues. In the application scenario where the wire hook is installed inside the slender tube, the wire hook is usually rotatably installed in the slender tube by a pin shaft. According to the surgical requirements, the diameter size of the slender tube cannot exceed the specified value. When the diameter size is too large, the damage to tissues will increase, the safety risk is relatively high, and the surgical success rate will decrease. In order to enable the wire hook to flexibly rotate and adjust the wire-hooking position inside the slender tube, the volume size of the wire hook provided inside the slender tube will be restricted by the diameter size of the slender tube.

[0004] However, when the volume size of the wire hook is small, the reliability of wire hooking is reduced, there is a relatively high risk of wire-hooking failure, the suture is easy to slip off from the wire hook, and it is easy to deform when stressed, which requires higher material strength and results in an increase in cost. Summary of the Invention

[0005] Based on this, it is necessary to overcome the defects of the prior art and provide a stapler and an outer tube assembly, which can improve the reliability and stability of wire hooking of the wire hook.

[0006] An outer tube assembly, the outer tube assembly includes:

[0007] An outer tube, an avoidance opening is formed on the distal side wall of the outer tube;

[0008] A protective member, the protective member is installed at the distal end of the outer tube, the protective member is provided with a protective part covering at least part of the avoidance opening, the outer wall of the protective part protrudes from the outer side wall of the outer tube, a first avoidance recess is formed on the inner wall of the protective part, and the depression depth of the first avoidance recess is at least partially greater than the depression depth of the inner wall of the outer tube; and

[0009] A wire hook, the wire hook is rotatably arranged inside the distal end of the outer tube, and the wire hook is configured such that one end of the wire hook enters the first avoidance recess when performing a wire-hooking action.

[0010] In one embodiment, the first avoidance recess extends axially along the outer tube to the proximal end face of the protection part; and / or, a rotation limit step is formed on the inner wall of the distal end of the first avoidance recess, and the rotation limit step is used to stop the wire hook from rotating along the first rotation direction when cooperating with the wire hook in abutment.

[0011] In one embodiment, the outer wall of the protection part protruding to the outside of the outer tube is provided as an arc surface.

[0012] In one embodiment, the protection part is snap-fitted to the avoidance opening.

[0013] In one embodiment, a negative pressure window communicating with the inside of the outer tube is provided on the outer side wall of the outer tube, and the negative pressure window is located on one side of the avoidance opening close to the proximal end of the outer tube, and the negative pressure window is used to suck the target tissue into the inside of the outer tube.

[0014] In one embodiment, a guiding part recessed towards the distal end of the protection part is formed at the proximal end of the protection part, and the guiding part is used for threading and guiding the suture.

[0015] In one embodiment, the protection part includes a plugging head and an intubation tube connected to the plugging head; the plugging head protrudes to the outside of the outer tube, and the intubation tube is inserted into the inside of the outer tube; the protection part is formed on the tube wall of the intubation tube.

[0016] In one embodiment, a positioning step protruding from the tube wall of the intubation tube is formed at the part where the plugging head is connected to the intubation tube, and the positioning step abuts against the distal end face of the outer tube; and / or, the intubation tube is in interference fit with the outer tube.

[0017] In one embodiment, the outer tube assembly further includes a support seat, the support seat is fixedly installed inside the distal end of the outer tube, and the wire hook is rotatably installed on the support seat.

[0018] A stapler, the stapler includes the outer tube assembly as described above.

[0019] The above-mentioned stapler and outer tube assembly have a first avoidance recess formed in the inner wall of the protective part and recessed outwardly from the outer tube, and the protective part protrudes to the outside of the outer tube through the avoidance opening, providing more movement space for the wire hook when the wire hook rotates. When the wire hook rotates to the wire-hooking position, one end of the wire hook can move into the first avoidance recess. Furthermore, the volume and size of the wire hook can be relatively increased, thereby improving the reliability and stability of wire hooking and preventing the suture from loosening. In addition, the structural strength can be increased, and it is not easy to deform when stressed, and the material cost can be reduced. Additionally, the protective part plays a protective role, preventing the wire hook from contacting the tissue during rotation and causing tissue scratches, so the safety is guaranteed. Description of the Drawings

[0020] Figure 1 The structural diagram of a stapler according to an embodiment of the present application.

[0021] Figure 2 is Figure 1 The enlarged view of the outer tube assembly of the structure shown at A.

[0022] Figure 3 is Figure 2 The exploded structural diagram of the structure shown.

[0023] Figure 4 is Figure 2 The sectional view of the structure shown.

[0024] Figure 5 is Figure 2 The structural diagram of a protective part in the structure shown from one perspective.

[0025] Figure 6 is Figure 5 The structural diagram of the structure shown from another perspective.

[0026] Figure 7 is Figure 2 The structural diagram of a support seat in the structure shown from one perspective.

[0027] Figure 8 is Figure 7 The structural diagram of the structure shown from another perspective.

[0028] 10. Outer tube assembly; 11. Outer tube; 111. Avoidance opening; 112. Negative pressure window; 113. Third shaft hole; 12. Protective part; 121. Protective portion; 1211. First avoidance recess; 1212. Rotation limiting step; 1213. Guide portion; 122. Plugging head; 123. Insertion tube; 1231. First insertion portion; 1232. Bayonet; 1233. Limiting portion; 124. Positioning step; 13. Wire hook; 131. Mounting seat; 1311. Connecting column; 1312. First shaft hole; 1313. Mounting hole; 132. Claw; 14. Support seat; 141. Support arm; 1411. Second shaft hole; 142. Second insertion portion; 143. Second avoidance recess; 144. Third avoidance recess; 15. Pin; 16. Push rod. Detailed implementation manners

[0029] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it still needs to be noted that the proximal end refers to the end of the instrument or component close to the operator, and the distal end refers to the end of the instrument or component far from the operator; the axial direction refers to the direction parallel to the center line connecting the distal end and the proximal end of the instrument or component, the radial direction refers to the direction perpendicular to the axial direction, and the circumferential direction refers to the direction surrounding the axial direction.

[0031] Refer to Figures 1 to 4 , Figure 1 which shows the structural diagram of a stapler according to an embodiment of the present application. Figure 2 shows Figure 1 an enlarged view of the outer tube assembly 10 of the structure shown at A. Figure 3 shows Figure 2 the exploded structural diagram of the structure shown. Figure 4 shows Figure 2Cross-sectional view of the structure shown. An outer tube assembly 10 provided by an embodiment of the present application, the outer tube assembly 10 includes: an outer tube 11, a protective member 12 and a wire hook 13. An avoidance opening 111 is formed on the distal side wall of the outer tube 11. The protective member 12 is installed at the distal end of the outer tube 11, and the protective member 12 is provided with a protective portion 121 covering at least part of the avoidance opening 111, and the outer wall of the protective portion 121 protrudes beyond the outer side wall of the outer tube 11. A first avoidance recess 1211 is formed on the inner wall of the protective portion 121, and the depression depth of the first avoidance recess 1211 is at least partially greater than the depression depth of the outer tube 11. The outward direction refers to the direction from the inside of the outer tube 11 to the outside of the outer tube 11, so that the outer wall of the protective portion 121 protrudes to the outside of the outer tube 11 through the avoidance opening 111. The wire hook 13 is rotatably arranged inside the distal end of the outer tube 11, and the wire hook 13 is configured such that one end of the wire hook 13 enters the first avoidance recess 1211 when performing a wire-hooking action.

[0032] It should be noted that the inner wall of the protective portion 121 refers to the side wall of the protective portion 121 facing the inside of the outer tube 11, that is, the side wall close to the axis of the outer tube 11; conversely, the outer wall of the protective portion 121 refers to the side wall of the protective portion 121 facing the outside of the outer tube 11, that is, the side wall away from the axis of the outer tube 11.

[0033] It should also be noted that the above-mentioned "depression depth of the inner wall of the outer tube" is usually equal to zero, that is, there is no depression on the inner wall of the outer tube; of course, the present application does not exclude the case where the inner wall of the outer tube is recessed outward.

[0034] In the above-mentioned outer tube assembly 10, since the inner wall of the protective portion 121 is formed with a first avoidance recess 1211 recessed toward the outside of the outer tube 11, and the protective portion 121 protrudes to the outside of the outer tube 11 through the avoidance opening 111, when the wire hook 13 rotates, more movement space is provided for the wire hook 13. When the wire hook 13 rotates to the wire-hooking position, one end of the wire hook 13 can move into the first avoidance recess 1211. Furthermore, the volume size of the wire hook 13 can be relatively increased, thereby improving the reliability and stability of wire hooking and preventing the suture from loosening. In addition, the structural strength can be increased, it is not easy to deform when stressed, and the material cost can be reduced. In addition, the protective portion 121 plays a protective role, preventing the wire hook 13 from contacting the tissue during rotation and causing tissue scratches, so the safety is guaranteed.

[0035] Please refer to Figures 3 to 6 , in some embodiments, the first avoidance recess 1211 extends along the axial direction of the outer tube 11 to the proximal end face of the protective portion 121. In this way, during the rotation of the wire hook 13 inside the outer tube 11, the wire hook 13 can smoothly rotate into the first avoidance recess 1211 and rotate back to the reset position, without interfering with the outer tube 11.

[0036] In some embodiments, a rotation limiting step 1212 is formed on the inner wall of the distal end of the first avoidance recess 1211. The rotation limiting step 1212 is used to stop the rotation of the wire hook 13 along the first rotation direction when it abuts and cooperates with the wire hook 13. It should be noted that the first rotation direction refers to the rotation direction from the release position to the wire-hooking position. Thus, when the wire hook 13 rotates to the wire-hooking position, one end of the wire hook 13 can abut against the rotation limiting step 1212, and the rotation limiting step 1212 plays a role in positioning the wire hook 13, which can prevent the wire hook 13 from continuing to rotate, thereby improving the reliability and stability of wire hooking.

[0037] In one embodiment, the outer wall of the protective part 121 protruding to the outside of the outer tube 11 is arranged as an arc surface. The arc surface can be a circular arc surface, an elliptical arc surface, or a combination of the two. During the operation, the damage to the tissue is relatively small when the arc surface contacts the tissue. Of course, as some alternative solutions, the outer wall of the protective part 121 protruding to the outside of the outer tube 11 can also be flexibly adjusted and set into various other regular and irregular shapes according to actual needs, which will not be limited here.

[0038] In one embodiment, the protective part 121 is snap-fitted into the avoidance opening 111. Thus, the avoidance opening 111 is also the snap-fitting opening that can snap-fit the protective part 121. When snap-fitting with the protective part 121, it can improve the installation stability of the protective part 12 inside the distal end of the outer tube 11 and at the same time achieve good sealing performance.

[0039] Specifically, the avoidance opening 111 extends to the distal end opening of the outer tube 11, which facilitates snap-fitting and installing the protective part 12 inside the outer tube 11. In addition, the two opposite side walls of the outer tube 11 forming the avoidance opening 111 are respectively in close contact with the protective part 121, enabling the protective part 12 to be stably installed inside the distal end of the outer tube 11.

[0040] In one embodiment, a negative pressure window 112 communicating with the inside of the outer tube is provided on the outer side wall of the outer tube 11, and the negative pressure window 112 is located on the side of the avoidance opening close to the proximal end of the outer tube 11. Specifically, when the protective part 12 is removed from the outer tube 11, the negative pressure window 112 communicates with the avoidance opening 111. The negative pressure window 112 is used to suck the target tissue into the inside of the outer tube 11. Specifically, during the operation, under the suction force of the suction mechanism of the stapler, the target tissue enters the inside of the outer tube 11 through the negative pressure window 112. The puncture part of the stapler moves axially towards the distal end of the outer tube 11 to puncture the target tissue. After completing the puncture action, the wire hook 13 is rotated to the wire-hooking position, and the wire hook 13 can smoothly hook up the suture passing through the target tissue.

[0041] In one embodiment, a guiding portion 1213 is formed at the proximal end of the protection portion 121 and is recessed toward the distal end of the protection member 12. The guiding portion 1213 is used for threading and guiding a suture. In this way, during the suturing process, the suture is always threaded through the guiding portion 1213, and the suturing of the target tissue is completed under the guidance of the guiding portion 1213, which can prevent the suture from moving to other positions during the surgical process, resulting in, for example, entanglement and knotting, or the displacement of the wire hook 13, thereby ensuring the stability and reliability of the suturing work of the wire hook 13.

[0042] In one embodiment, the protection member 12 includes a plugging head 122 and an insertion tube 123 connected to the plugging head 122. The plugging head 122 protrudes to the outside of the outer tube 11, and the insertion tube 123 is inserted into the inner part of the outer tube 11. The protection portion 121 is formed on the tube wall of the insertion tube 123.

[0043] In one embodiment, at the part where the plugging head 122 is connected to the insertion tube 123, a positioning step 124 protrudes from the tube wall of the insertion tube 123. The positioning step 124 abuts against the distal end face of the outer tube 11. In this way, the protection member 12 is inserted into the inner part of the distal end opening of the outer tube 11 for plugging the opening. During the processing of the outer tube 11, there is no need to perform further processing at the distal end opening for plugging, but it can be plugged by the protection member 12. The protection member 12 can be processed independently, thereby reducing the processing difficulty and the mold cost.

[0044] Of course, as some alternative solutions, the protection member 12 can also be integrally formed with the outer tube 11, that is, integrally molded with the outer tube 11.

[0045] Please refer to Figure 3 、 Figure 4 、 Figure 7 and Figure 8 , in one embodiment, the outer tube assembly 10 further includes a support base 14. The support base 14 is fixedly installed inside the distal end of the outer tube 11, and the wire hook 13 is rotatably installed on the support base 14. In this way, since the support base 14 is fixedly installed inside the distal end of the outer tube 11 and the wire hook 13 is installed on the support base 14, the wire hook 13 is rotatably installed on the support base 14, thereby improving the installation reliability and stability of the wire hook 13 inside the outer tube 11, and further preventing the suture from slipping during the process of the wire hook 13 hooking the suture.

[0046] Specifically, the support base 14 is provided with two support arms 141 arranged at intervals. The wire hook 13 includes a mounting base 131 located between the two support arms 141 and rotatably connected to the two support arms 141 respectively, and a claw 132 connected to the mounting base 131. In this way, the mounting base 131 of the wire hook 13 is rotatably connected to the two support arms 141 of the support base 14 respectively, thereby improving the installation reliability and stability of the wire hook 13 inside the outer tube 11.

[0047] Please refer to Figure 2 、 Figure 3 and Figure 7 In one embodiment, the opposite sides of the mounting seat 131 are respectively abutted against the two support arms 141. In this way, the two support arms 141 play a limiting role to prevent the wire hook 13 from moving inside the outer tube 11 along the rotation axis direction, so that the installation reliability and stability of the wire hook 13 inside the outer tube 11 are further improved.

[0048] In one embodiment, the two support arms 141 are respectively abutted and cooperated with the opposite sides of the inner side wall of the outer tube 11. It should be noted that the abutting cooperation in this embodiment can be either direct abutment or indirect abutment, that is, an intermediate element is allowed between the two. In this way, the structural strength can be increased, and the support arm 141 can be prevented from deforming under force, so that the installation reliability and stability of the wire hook 13 inside the outer tube 11 are further improved.

[0049] Optionally, the side surface of the support arm 141 facing the inner side wall of the outer tube 11 is adapted to the shape of the inner side wall of the outer tube 11. Specifically, for example, it is set as an arc surface, so that the stability is better when the support arm 141 fits on the inner side wall of the outer tube 11.

[0050] In addition, the portions where the support arm 141 and the mounting seat 131 abut against each other are both set as planes. Specifically, the side surface of the support arm 141 facing the mounting seat 131 is, for example, set as a plane. The mounting seat 131 and the support arm 141 are abutted and cooperated in a plane manner. In this way, when the mounting seat 131 rotates relative to the support arm 141, the friction force received is small, and at the same time, it will not shake left and right, and the rotation stability is good.

[0051] In a specific embodiment, the mounting seat 131 includes a connecting column 1311. The opposite two end faces of the connecting column 1311 are set as planes and are respectively abutted and cooperated with the two support arms 141.

[0052] In one embodiment, the outer tube assembly 10 further includes a pin shaft 15. A first shaft hole 1312 is provided on the mounting seat 131. Specifically, for example, the first shaft hole 1312 penetrates through opposite ends of the connecting column 1311. In addition, each support arm 141 is provided with a second shaft hole 1411 corresponding to the position of the first shaft hole 1312. Opposite side portions of the outer tube 11 are formed with third shaft holes 113 corresponding to the position of the first shaft hole 1312. The pin shaft 15 is respectively inserted through the first shaft hole 1312, the two second shaft holes 1411, and the two third shaft holes 113 so that the mounting seat 131, the support arms 141, and the outer tube 11 are combined and connected. In this way, on the one hand, the mounting seat 131 can rotate freely and flexibly inside the outer sleeve; on the other hand, in the assembly process, the first shaft hole 1312 of the mounting seat 131, the second shaft hole 1411 of the support arm 141, and the third shaft hole 113 of the outer tube 11 are relatively aligned, and then the pin shaft 15 is inserted, so that the wire hook 13 can be rotatably installed inside the outer sleeve, and the assembly operation is relatively convenient.

[0053] In some embodiments, both ends of the pin shaft 15 can be fixed to the outer tube 11 by welding, or can be fixed to the outer tube 11 by riveting, or can be fixed to the outer tube 11 by plugging, etc., as long as the end of the pin shaft 15 is connected to the outer tube 11 to prevent it from detaching from the outer tube 11.

[0054] In one embodiment, the insertion tube 123 is provided with a first insertion portion 1231, and the support seat 14 is provided with a second insertion portion 142. The support seat 14 is inserted into the insertion tube 123, and the second insertion portion 142 and the first insertion portion 1231 are inserted and matched with each other. In this way, the protective member 12 and the support seat 14 can be fixedly installed inside the distal end of the outer tube 11, and the protective member 12 and the support seat 14 can be prevented from rotating circumferentially along the outer tube 11 inside the outer tube 11.

[0055] In one embodiment, the insertion tube 123 is in interference fit with the tube opening of the outer tube 11. In this way, the insertion tube 123 is stably installed inside the outer tube 11.

[0056] In one embodiment, the outer wall of the plugging head 122 is an arc surface or an ellipsoidal arc surface. In this way, during the process of entering the surgical channel, the damage to the tissue can be reduced.

[0057] In one embodiment, the support seat 14 is in interference fit with the insertion tube 123. In addition, the shape of the distal outer wall of the support seat 14 is adapted to the shape of the inner wall of the plugging head 122. Specifically, for example, the inner wall of the plugging head 122 is a spherical surface, and the distal outer wall of the support seat 14 is correspondingly a spherical surface. This can make the connection between the support seat 14 and the protective member 12 stable.

[0058] In some embodiments, the first plugging portion 1231 is, for example, a plugging opening formed on the tube wall of the insertion tube 123. The second plugging portion 142 is correspondingly, for example, a plugging block protruding from the outer wall of the support base 14, and the plugging block is plugged and fixed in the plugging opening.

[0059] In some embodiments, the opposite sides of the insertion tube 123 are respectively provided with the first plugging portions 1231, and the opposite sides of the support base 14 are respectively provided with the second plugging portions 142. Optionally, the two first plugging portions 1231 are symmetrically arranged about the axis of the outer tube 11, and the two second plugging portions 142 are symmetrically arranged about the axis of the outer tube 11.

[0060] In some embodiments, the outer tube assembly 10 further includes a pin shaft 15. The pin shaft 15 penetrates through the support base 14. A bayonet 1232 and a limiting portion 1233 are formed at the edge of the plugging opening. The limiting portion 1233 is formed at the proximal end of the bayonet 1232 and is adjacent to the bayonet 1232, and the pin shaft 15 is snapped into the bayonet 1232. In this way, the protective member 12 does not interfere with the rotation of the wire hook 13, and at the same time, the overall structure is compactly arranged and the volume size is small.

[0061] Please refer to Figure 4 、 Figure 5 and Figure 7 In some embodiments, a second avoidance recess 143 is formed on the support base 14 for corresponding setting with the puncturing member of the stapler. In this way, after the puncturing member of the stapler punctures the target tissue, it can correspondingly enter the second avoidance recess 143, so as not to be interfered by the support base 14.

[0062] Please refer to Figure 4 、 Figure 5 and Figure 7 In some embodiments, a third avoidance recess 144 is further formed on the support base 14 for corresponding setting with the pushing and pulling mechanism of the stapler. In this way, when the pushing and pulling mechanism moves and extends towards the distal end of the outer tube 11, it can correspondingly enter the third avoidance recess 144, so as not to be interfered by the support base 14.

[0063] In one embodiment, a stapler includes the outer tube assembly 10 of any of the above embodiments.

[0064] The above-mentioned stapler has a first avoidance recess 1211 formed on the inner wall of the protection part 121 and recessed outwardly from the outer tube 11, and the protection part 121 protrudes out of the outer tube 11 through the avoidance opening 111, providing more movement space for the thread hook 13 when the thread hook 13 rotates. When the thread hook 13 rotates to the thread-catching position, one end of the thread hook 13 can move into the first avoidance recess 1211. Thus, the volume and size of the thread hook 13 can be relatively increased, thereby improving the reliability and stability of thread-catching and preventing the suture from loosening. In addition, the structural strength can be increased, it is not easily deformed when stressed, and the material cost can be reduced. Moreover, the protection part 121 plays a protective role and can prevent the thread hook 13 from contacting the tissue during rotation and causing tissue scratches, so the safety is guaranteed.

[0065] In some embodiments, the puncturing member includes, but is not limited to, a puncturing needle. A threading hole is provided on the puncturing needle, and the suture is threaded through the threading hole and penetrates into the target tissue along with the puncturing needle to achieve suturing of the target tissue.

[0066] Please refer to Figure 4 and Figure 5 , in some embodiments, the pushing and pulling mechanism includes a push-pull rod and a moving block connected to the push-pull rod. An activity hole is formed on the moving block. The activity hole includes, but is not limited to, an oval hole, a strip hole, etc. The outer tube assembly 10 further includes a push rod 16 connected to the mounting seat 131. Specifically, the mounting seat 131 is formed with a mounting hole 1313, one end of the push rod 16 is inserted into the mounting hole 1313, and the other end of the push rod 16 extends out of the mounting seat 131 and is inserted into the activity hole and can move along the activity hole. Among them, the push-pull rod can move back and forth either under manual drive or under the drive of a power mechanism such as a lead screw motor or a cylinder, which is not limited herein and can be flexibly adjusted and set according to actual needs. When the push-pull rod drives the moving block to reciprocate, the moving block drives the push rod 16 to act, and the push rod 16 moves along the activity hole accordingly and drives the mounting seat 131 to rotate, so as to realize the switching of the claw 132 between the release position and the thread-catching position.

[0067] Please refer to Figure 4 and Figure 5 , in some embodiments, the target tissue can penetrate into the interior of the outer tube 11 through the negative pressure window 112 under the suction of negative pressure. During the suturing operation, the puncturing member and the thread hook 13 cooperate with each other to achieve the suturing of the target tissue.

[0068] It should be noted that the "mounting seat 131" can be "a part of the thread hook 13", that is, the "mounting seat 131" and the "other parts of the thread hook 13" are integrally formed; or it can be an independent component separable from the "other parts of the thread hook 13", that is, the "mounting seat 131" can be independently manufactured and then combined with the "other parts of the thread hook 13" into a whole.

[0069] It should be noted that the outer tube assembly in this application is intended to cover the case where the parts in the outer tube assembly can be directly assembled, and also the case where the parts of the outer tube assembly cannot be directly assembled, but need to be assembled with the help of components such as the housing and the components inside the housing of a medical device.

[0070] It also should be noted that the related technologies in the background art of this application are only for facilitating the description of the technical problems to be solved by this application, and these related technologies do not necessarily belong to the prior art.

[0071] In addition, if the terms "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plural" appears, the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0072] In this application, unless otherwise clearly specified and limited, if terms such as "install", "connect", "join", "fix", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0074] The above-described embodiments only represent several implementation manners of this application, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. An outer tube assembly, characterized in that: The outer tube assembly comprises: An outer tube, wherein a relief opening is formed on a distal side wall of the outer tube; A protective member, the protective member is installed at the distal end of the outer tube, the protective member is provided with a protective portion covering at least a portion of the avoidance opening, the outer wall of the protective portion protrudes from the outer side wall of the outer tube, the inner wall of the protective portion is formed with a first avoidance recess, and the recess depth of the first avoidance recess is at least partially greater than the recess depth of the inner wall of the outer tube; and A wire hook is rotatably disposed inside the distal end of the outer tube, and is configured such that one end of the wire hook enters the first avoidance recess when performing a wire hooking action.

2. The outer tube assembly according to claim 1, characterized in that: The first avoidance recess extends along the axial direction of the outer tube to the proximal end face of the protective portion; and / or, a distal inner wall of the first avoidance recess forms a rotation limit step, and the rotation limit step is used to stop the wire hook from rotating along the first rotation direction when it abuts against the wire hook.

3. The outer tube assembly according to claim 1, characterized in that: The outer wall of the protection part protruding to the outside of the outer tube is arranged to be an arc-shaped surface.

4. The outer tube assembly according to claim 1, characterized in that: The protection part is clamped on the escape opening.

5. The outer tube assembly according to claim 1, characterized in that: The outer side wall of the outer tube is provided with a negative pressure window connected to the inside of the outer tube, and the negative pressure window is located on the side of the avoidance port close to the proximal end of the outer tube, and the negative pressure window is used to suck the target tissue into the inside of the outer tube.

6. The outer tube assembly according to claim 1, characterized in that: A guide portion is formed at the proximal end of the protection part and is recessed toward the distal end of the protection part. The guide portion is used for passing and guiding a suture thread.

7. The outer tube assembly according to claim 1, characterized in that: The protective member comprises a plugging head and a cannula connected to the plugging head; the plugging head protrudes outside the outer tube, and the cannula is inserted inside the outer tube; the protective part is formed on the tube wall of the cannula.

8. The outer tube assembly according to claim 7, characterized in that: The portion where the plugging head is connected to the cannula protrudes from the tube wall of the cannula to form a positioning step, and the positioning step abuts against the distal end surface of the outer tube; and / or the cannula and the outer tube are interference fit.

9. The outer tube assembly according to any one of claims 1 to 8, characterized in that: The outer tube assembly also includes a support seat, which is fixedly mounted inside the distal end of the outer tube, and the wire hook is rotatably mounted on the support seat.

10. A stapler, characterized in that: The stapler comprises the outer tube assembly according to any one of claims 1 to 9.

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