CN210697757U

CN210697757U - Detachable ultrasonic knife head

Info

Publication number: CN210697757U
Application number: CN201920700524.XU
Authority: CN
Inventors: 陈飚; 陈启章; 周晴杰
Original assignee: China Surgical Shanghai Corp
Current assignee: Reach Surgical Inc
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-06-09
Anticipated expiration: 2029-05-16

Abstract

The utility model relates to a detachable ultrasonic knife head, which comprises a shell, a knife bar component, a shear head and a pulling handle, wherein the pulling handle is movably connected with the shell; the cutter bar component comprises a push rod, an ultrasonic action rod and a sleeve; the ultrasonic action rod is arranged on the shell; the sleeve is sleeved on the ultrasonic action rod and detachably connected with the shell, and the shearing head is movably connected with the sleeve; the push rod comprises a push input rod and a push output rod, the push input rod is connected with the trigger, the front end of the push output rod is connected with the shear head, and the front end of the push input rod is detachably connected with the rear end of the push output rod through an intermediate connecting piece. The utility model discloses a detachable supersound sword tool bit promotes input rod, crop and sleeve pipe and can dismantle simultaneously to in the part of inserting the sleeve pipe to ultrasonic action pole, and the promotion input rod, crop and the sleeve pipe of dismantling are washd.

Description

Detachable ultrasonic knife head

Technical Field

The utility model relates to an supersound sword technical field especially relates to a detachable supersound sword tool bit.

Background

Ultrasonic knives, which are ultrasonic waves that cut internal tissues of the human body like true knives using the principle of ultrasound, have been commonly used in clinical surgical treatment. The ultrasonic knife mainly comprises a main machine, a driving handle, a connecting wire, a knife head, a foot switch and the like; the working principle is that the pedal or handheld cutter head is used for activation, at the moment, the host outputs electric energy under the resonance frequency of the vibration system to the driving handle, the driving handle converts the electric energy into mechanical energy and outputs the mechanical energy to the cutter head, and the cutter head further amplifies the vibration to carry out mechanical vibration, so that water in tissue cells is vaporized, protein hydrogen bonds are broken, the cells are disintegrated, the tissues are cut or coagulated, and the purposes of cutting the tissues and stopping bleeding are achieved.

The ultrasonic scalpel head comprises a shell and a toolbar assembly, the toolbar assembly comprises an ultrasonic action rod, a first toolbar and a second toolbar, the rear end of the second toolbar is fixedly connected with the shell, one end of a shearing head is connected with the front end of the first toolbar and hinged with the front end of the second toolbar, the shearing head can move relative to the ultrasonic action rod to open or close, and a clamping state can be formed when the shearing head is closed so as to clamp tissues; when the shearing head and the ultrasonic action rod clamp tissues, the shearing head, the ultrasonic action rod, the first cutter rod piece and the second cutter rod piece are all stained with tissues and blood of a human body, and the ultrasonic action rod, the first cutter rod piece and the second cutter rod piece are all fixedly arranged, so that the interiors of the first cutter rod piece and the second cutter rod piece and the tissues and blood stained in the ultrasonic action rod cannot be cleaned. How to design a structure capable of facilitating the cleaning of the cutter bar assembly is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a detachable supersound sword tool bit to overcome prior art's above-mentioned defect.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a detachable ultrasonic scalpel head comprises a shell, a scalpel rod assembly, a shearing head and a pulling handle, wherein the pulling handle is movably connected with the shell; the cutter bar component comprises a push rod, an ultrasonic action rod and a sleeve; the ultrasonic action rod is arranged on the shell; the sleeve is sleeved on the ultrasonic action rod and detachably connected with the shell, and the rear end of the shearing head is movably connected with the sleeve; the pushing rod comprises a pushing input rod and a pushing output rod, the rear end of the pushing input rod is connected with the trigger handle, the front end of the pushing output rod is connected with the shear head, and the front end of the pushing input rod is detachably connected with the rear end of the pushing output rod through an intermediate connecting piece.

Preferably, the intermediate connector has an axial through hole with a connector internal thread therein; the outer side of the front end of the pushing input rod is provided with an input rod external thread corresponding to the connecting piece internal thread, the outer side of the rear end of the pushing output rod is provided with an output rod external thread corresponding to the connecting piece internal thread, and the length of the output rod external thread of the pushing output rod is larger than that of the middle connecting piece.

Furthermore, the outer side surface of the middle connecting piece is provided with at least one group of clamping parts, and each group of clamping parts comprises two grooves which are oppositely arranged on the outer side surface of the middle connecting piece.

Preferably, a pipe external thread is arranged at the rear end of the sleeve, and a shell internal thread corresponding to the pipe external thread is arranged inside the shell.

Preferably, the detachable ultrasonic knife head further comprises a sealing ring, and the sealing ring is clamped between the ultrasonic action rod and the sleeve.

Preferably, the shear head comprises a head part, two oppositely arranged back plate parts are arranged at the back end of the head part, and movable connecting parts are arranged on the opposite inner side surfaces of the two back plate parts; the sleeve is provided with two oppositely arranged bearing through holes, and each bearing through hole is hinged with the movable connecting part.

Further, the front end of the push output rod is connected with the shear head through a serial piece; a first mounting hole is formed in one of the two rear pieces, a second mounting hole is formed in the other rear piece of the two rear pieces, the first mounting hole and the second mounting hole are coaxially arranged, the diameter of the first mounting hole is larger than that of the second mounting hole, a first internal thread is formed in the first mounting hole, and a second internal thread is formed in the second mounting hole; the front end of the push output rod is provided with a middle through hole which is through along the radial direction of the push output rod, the diameter of the middle through hole is smaller than that of the first mounting hole, and the diameter of the middle through hole is larger than that of the second mounting hole; the series connection piece comprises a first shaft part, a middle shaft part and a second shaft part which are sequentially connected in series and coaxially arranged, the diameter of the first shaft part is the same as that of the first mounting hole, and a first external thread corresponding to the first internal thread is arranged on the first shaft part; the middle shaft part is in clearance fit with the middle through hole; the diameter of the second shaft part is the same as that of the second mounting hole, a second external thread corresponding to the second internal thread is arranged on the second shaft part, and the length of the middle shaft part is equal to the distance between the first mounting hole and the second mounting hole.

Furthermore, the cross section of the movable connecting part is formed by a first straight line, a first arc line, a second straight line and a second arc line which are connected in sequence; the length of the first straight line is smaller than that of the second straight line, and the first arc line and the second arc line are both outwards convex; the first arc line and the second arc line are arranged in an axisymmetric manner by taking a connecting line of the middle point of the first straight line and the middle point of the second straight line as a central axis; the receiving through hole comprises a rectangular hole part and a circular hole part which are communicated with each other, the diameter of the circular hole part is larger than the length of the rectangular hole part, and the length of the rectangular hole part is larger than the distance between the first straight line and the second straight line; the length of the first straight line is greater than the diameter of the circular hole part; the movable connecting part penetrates through the bearing through hole and penetrates into the sleeve.

Compared with the prior art, the utility model discloses the progress that has showing:

in the detachable ultrasonic knife head of the utility model, the trigger handle is rotated to drive the connected pushing input rod and pushing output rod to move, so that the shear head can move along with the pushing output rod to fold and unfold the shear head and the ultrasonic action rod; because the front end of the pushing input rod is detachably connected with the rear end of the pushing output rod through the intermediate connecting piece, and the sleeve is detachably connected with the shell, the pushing input rod is separated from the pushing output rod by adjusting the intermediate connecting piece, and then the sleeve is detached from the shell, so that the pushing input rod, the shearing head and the sleeve can be detached simultaneously, and the part of the ultrasonic action rod inserted into the sleeve and the detached pushing input rod, shearing head and sleeve can be cleaned; the utility model discloses a detachable supersound sword tool bit, simple structure, convenient to use, and be convenient for wash detachable supersound sword tool bit.

Drawings

Fig. 1 is a schematic view of the internal structure of the detachable ultrasonic-blade head of the present embodiment.

Fig. 2 is a schematic structural view of the detachable ultrasonic scalpel head of the present embodiment when the push input rod and the push output rod are connected through the intermediate connector.

Fig. 3 is a schematic view of the structure in which the middle connector of the detachable ultrasonic-knife head of the present embodiment is moved to the push output rod, so that the push input rod is separated from the push output rod.

Fig. 4 is a schematic internal perspective view of the sleeve of the detachable ultrasonic-blade unit according to the present embodiment when mounted on the housing.

Fig. 5 is a schematic view of the internal structure of the sleeve of the detachable ultrasonic-blade unit according to the present embodiment when the sleeve is not attached to the housing.

Fig. 6 is a schematic structural view of the detachable ultrasonic scalpel head of the present embodiment when the push rod, the sleeve and the shear head are disassembled.

Fig. 7 is a schematic structural view of the detachable ultrasonic-blade head of the present embodiment with the sleeve and the shear head exploded.

Fig. 8 is a schematic cross-sectional view of the flexible connection portion of the cutting head of the detachable ultrasonic-blade head according to the present embodiment.

Description of the reference numerals

100 case

101 shell internal thread

200 cutter bar assembly

210 push rod

211 pushing the input lever

2111 push the front end of the input rod

212 push output rod

2121 pushing the rear end of the output rod

220 ultrasonic action rod

230 sleeve

231 rear end of sleeve

232 receiving through hole

2321 rectangular hole part

2322 circular hole

240 middle connector

241 axial through hole

242 groove

300 scissor head

310 head part

320 back part

321 movable connecting part

3211 first straight line

3212 first arc line

3213 second straight line

3214 second arc line

322 first mounting hole

323 second mounting hole

400 throw handle

500 sealing ring

600 series connection piece

610 first shaft part

620 middle shaft part

630 second shaft part

Length of L-shaped rectangular hole

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1 to 8, the detachable ultrasonic scalpel head of the present embodiment includes a housing 100, a scalpel bar assembly 200, a scissor head 300 and a trigger 400, wherein the trigger 400 is movably connected to the housing 100;

the knife bar assembly 200 includes a pusher bar 210, an ultrasonic action bar 220, and a sleeve 230; the ultrasonic action bar 220 is mounted on the housing 100; the sleeve 230 is sleeved on the ultrasonic action rod 220, the sleeve 230 is detachably connected with the shell 100, and the rear end of the shear head 300 is movably connected with the sleeve 230; the push rod 210 comprises a push input rod 211 and a push output rod 212, the rear end of the push input rod 211 is connected with the trigger 400, the front end of the push output rod 212 is connected with the shear 300, and the front end 2111 of the push input rod 211 is detachably connected with the rear end 2121 of the push output rod 212 through an intermediate connector 240.

In the detachable ultrasonic scalpel head of the present invention, the trigger 400 is rotated, and the trigger 400 drives the connected pushing input rod 211 and pushing output rod 212 to move, so that the shear 300 moves along with the pushing output rod 212, thereby realizing the folding and unfolding of the shear 300 and the ultrasonic action rod 220; since the front end 2111 of the push input rod 211 is detachably connected to the rear end 2121 of the push output rod 212 via the intermediate connector 240, and the sleeve 230 is detachably connected to the housing 100, the push input rod 211, the shear 300, and the sleeve 230 can be simultaneously detached by adjusting the intermediate connector 240 to separate the push input rod 211 from the push output rod 212 and then detach the sleeve 230 from the housing 100, so as to clean the portion of the ultrasonic action rod 220 inserted into the sleeve 230, and the detached push input rod 211, shear 300, and sleeve 230.

The intermediate connector 240 has an axial through bore 241, the axial through bore 241 having a connector internal thread therein; an input rod external thread corresponding to the connecting piece internal thread is arranged on the outer side surface of the front end 2111 of the pushing input rod 211, an output rod external thread corresponding to the connecting piece internal thread is arranged on the outer side surface of the rear end 2121 of the pushing output rod 212, and the length of the output rod external thread of the pushing output rod 212 is larger than that of the middle connecting piece 240.

When it is necessary to connect the push input rod 211 with the push output rod 212, the front end 2111 of the push input rod 211 and the rear end 2121 of the push output rod 212 are screwed into the intermediate connector 240; when it is desired to separate the push input rod 211 from the push output rod 212, the intermediate link 240 is moved toward the push output rod 212 until the intermediate link 240 is fully moved onto the rear end 2121 of the push output rod 212; since the push input rod 211 and the push output rod 212 are both screw-coupled with the intermediate connector 240, the structure is easy to manufacture, and easy to install and disassemble.

At least one set of locking portions is disposed on the outer side surface of the middle connecting member 240, and each set of locking portions includes two grooves 242 oppositely disposed on the outer side surface of the middle connecting member 240. The two oppositely disposed recesses 242 allow the wrench to engage the intermediate link 240, facilitating rotation of the intermediate link 240 by the operator.

A pipe portion male screw is provided at a rear end 231 of the sleeve 230, and a shell portion female screw 101 corresponding to the pipe portion male screw is provided inside the housing 100. The threaded connection between the sleeve 230 and the housing 100 facilitates the quick removal of the sleeve 230 from the housing 100.

The detachable ultrasonic scalpel head further comprises a sealing ring 500, and the sealing ring 500 is clamped between the ultrasonic action rod 220 and the sleeve 230. The sealing ring 500 can reduce blood flow into the interior of the cannula 230. Since a small portion of blood enters the inside of the sleeve 230 through the sealing ring 500, the ultrasonic action rod 220 located inside the sleeve 230 can be cleaned after the sleeve 230 is detached.

The shear head 300 comprises a head part 310, two oppositely arranged back plate parts 320 are arranged at the rear end of the head part 310, and movable connecting parts 321 are arranged on the opposite inner side surfaces of the two back plate parts 320; the sleeve 230 is provided with two receiving through holes 232 arranged oppositely, and each receiving through hole 232 is hinged with the movable connecting part 321.

Because the two movable connecting portions 321 are hinged to the corresponding receiving through holes 232, the structure enables the cutting head 300 to be stably connected to the cutter bar, so as to ensure that the cutting head 300 can stably rotate relative to the cutter bar, and therefore, when the cutting head 300 can be closed with the front end of the ultrasonic action rod 220, the position of the cutting head is aligned.

The cross section of the movable connecting part 321 is defined by a first straight line 3211, a first arc line 3212, a second straight line 3213 and a second arc line 3214 which are connected in sequence; the length of the first straight line 3211 is smaller than that of the second straight line 3213, and both the first circular arc line 3212 and the second circular arc line 3214 are convex outward; the first circular arc line 3212 and the second circular arc line 3214 are axisymmetrically arranged with a connecting line between a midpoint of the first straight line 3211 and a midpoint of the second straight line 3213 as a central axis; the receiving through hole 232 includes a rectangular hole portion 2321 and a circular hole portion 2322 which are communicated with each other, the diameter of the circular hole portion 2322 is larger than the length L of the rectangular hole portion 2321, and the length L of the rectangular hole portion 2321 is larger than the distance between the first straight line 3211 and the second straight line 3213; the length of the first straight line 3211 is greater than the diameter of the circular hole portion 2322; the movable connecting portion 321 passes through the receiving through hole 232 and penetrates into the interior of the sleeve 230.

The length L of the rectangular hole 2321 is greater than the distance between the first straight line 3211 and the second straight line 3213, and the structure is such that the movable connecting portion 321 can penetrate into the receiving through hole 232 through the rectangular hole 2321; the length of the first straight line 3211 is smaller than the length of the second straight line 3213, and the length of the second straight line 3213 is greater than the diameter of the circular hole 2322, so that the movable connecting portion 321 can be stably located inside the bushing 230 when extending into the circular hole 2322 through the rectangular hole 2321, and the movable connecting portion 321 is prevented from moving outward through the circular hole 2322. The movable connection portion 321 is configured to facilitate the detachment of the shear head 300 from the casing 230.

Example 2

The present embodiment is different from embodiment 1 in that the front end of the push output rod 212 is connected to the shear head 300 through a string 600; a first mounting hole 322 is formed in one rear piece 320 of the two rear pieces 320, a second mounting hole 323 is formed in the other rear piece 320 of the two rear pieces 320, the first mounting hole 322 and the second mounting hole 323 are coaxially arranged, the diameter of the first mounting hole 322 is larger than that of the second mounting hole 323, a first internal thread is formed in the first mounting hole 322, and a second internal thread is formed in the second mounting hole 323; the front end of the push output rod 212 is provided with a middle through hole which is through along the radial direction of the push output rod 212, the diameter of the middle through hole is smaller than that of the first mounting hole 322, and the diameter of the middle through hole is larger than that of the second mounting hole 323;

the serial piece 600 comprises a first shaft part 610, a middle shaft part 620 and a second shaft part 630 which are sequentially connected in series and coaxially arranged, the diameter of the first shaft part 610 is the same as that of the first mounting hole 322, and a first external thread corresponding to the first internal thread is arranged on the first shaft part 610; the middle shaft portion 620 is in clearance fit with the middle through hole; the diameter of the second shaft portion 630 is the same as the diameter of the second mounting hole 323, a second external thread corresponding to the second internal thread is provided on the second shaft portion 630, and the length of the middle shaft portion 620 is equal to the distance between the first mounting hole 322 and the second mounting hole 323.

After the second shaft portion 630 passes through the first mounting hole 322 and the middle through hole, the second external thread of the second shaft portion 630 is connected with the second internal thread; since the length of the intermediate shaft portion 620 is equal to the distance of the interval between the first mounting hole 322 and the second mounting hole 323, the intermediate shaft portion 620 penetrating into the intermediate through hole is in the interval between the first mounting hole 322 and the second mounting hole 323; the first shaft portion 610 is mounted in the first mounting hole 322. Since the second shaft portion 630 and the first shaft portion 610 are both connected to the corresponding rear plate portion 320 by a screw structure, the push output rod 212 can be separated from the shear 300 by detaching the tandem 600 from the shear 300.

Since the push output rod 212 and the shear head 300 of the present embodiment can be directly detached, when the sleeve 230 needs to be detached, the push output rod 212 and the push input rod 211 do not need to be detached, and only the sleeve 230 needs to be detached from the housing 100, and after the sleeve 230 is detached, the ultrasonic action rod 220 can be directly cleaned.

The utility model discloses a detachable supersound sword tool bit, simple structure, convenient to use, and be convenient for wash detachable supersound sword tool bit.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A detachable ultrasonic scalpel head comprises a shell (100), a scalpel rod assembly (200), a scissor head (300) and a trigger handle (400), wherein the trigger handle (400) is rotatably connected with the shell (100);

the method is characterized in that:

the knife bar assembly (200) comprises a push rod (210), an ultrasonic action rod (220) and a sleeve (230);

the ultrasonic action rod (220) is mounted on the shell (100); the sleeve (230) is sleeved on the ultrasonic action rod (220), the sleeve (230) is detachably connected with the shell (100), and the rear end of the shear head (300) is movably connected with the sleeve (230);

the pushing rod (210) comprises a pushing input rod (211) and a pushing output rod (212), the rear end of the pushing input rod (211) is connected with the trigger (400), the front end of the pushing output rod (212) is connected with the shear head (300), and the front end (2111) of the pushing input rod (211) is detachably connected with the rear end (2121) of the pushing output rod (212) through an intermediate connecting piece (240).

2. The detachable ultrasonic blade cartridge of claim 1, wherein:

the intermediate connector (240) has an axial through hole (241), and the axial through hole (241) has a connector internal thread therein;

the outer side surface of the front end (2111) of the pushing input rod (211) is provided with an input rod external thread corresponding to the connecting piece internal thread, the outer side surface of the rear end (2121) of the pushing output rod (212) is provided with an output rod external thread corresponding to the connecting piece internal thread, and the length of the output rod external thread of the pushing output rod (212) is greater than that of the intermediate connecting piece (240).

3. The detachable ultrasonic blade cartridge of claim 2, wherein:

at least one group of clamping parts are arranged on the outer side face of the middle connecting piece (240), and each group of clamping parts comprise two grooves (242) which are oppositely arranged on the outer side face of the middle connecting piece (240).

4. The detachable ultrasonic blade cartridge of claim 1, wherein:

the rear end (231) of the sleeve (230) is provided with a pipe part external thread, and the inside of the shell (100) is provided with a shell part internal thread (101) corresponding to the pipe part external thread.

5. The detachable ultrasonic blade cartridge of claim 1, wherein:

the ultrasonic action rod further comprises a sealing ring (500), and the sealing ring (500) is clamped between the ultrasonic action rod (220) and the sleeve (230).

6. The detachable ultrasonic blade cartridge of claim 1, wherein:

the shear head (300) comprises a head part (310), the rear end of the head part (310) is provided with two rear piece parts (320) which are arranged oppositely, and the opposite inner side surfaces of the two rear piece parts (320) are respectively provided with a movable connecting part (321);

two oppositely-arranged bearing through holes (232) are formed in the sleeve (230), and each bearing through hole (232) is hinged to the movable connecting portion (321).

7. The detachable ultrasonic blade cartridge of claim 6, wherein:

the front end of the push output rod (212) is connected with the shear head (300) through a serial connection piece (600);

a first mounting hole (322) is formed in one of the two rear pieces (320), a second mounting hole (323) is formed in the other rear piece (320) of the two rear pieces (320), the first mounting hole (322) and the second mounting hole (323) are coaxially arranged, the diameter of the first mounting hole (322) is larger than that of the second mounting hole (323), a first internal thread is formed in the first mounting hole (322), and a second internal thread is formed in the second mounting hole (323); the front end of the push output rod (212) is provided with a middle through hole (2122) which penetrates through the push output rod (212) along the radial direction, the diameter of the middle through hole (2122) is smaller than that of the first mounting hole (322), and the diameter of the middle through hole (2122) is larger than that of the second mounting hole (323);

the series connection piece (600) comprises a first shaft part (610), a middle shaft part (620) and a second shaft part (630) which are sequentially connected in series and coaxially arranged, the diameter of the first shaft part (610) is the same as that of the first mounting hole (322), and a first external thread corresponding to the first internal thread is arranged on the first shaft part (610); the middle shaft part (620) is in clearance fit with the middle through hole (2122); the diameter of the second shaft part (630) is the same as that of the second mounting hole (323), and a second external thread corresponding to the second internal thread is arranged on the second shaft part (630);

the length of the intermediate shaft portion (620) is equal to the distance of the interval between the first mounting hole (322) and the second mounting hole (323).

8. The detachable ultrasonic blade cartridge of claim 6, wherein:

the cross section of the movable connecting part (321) is defined by a first straight line (3211), a first arc line (3212), a second straight line (3213) and a second arc line (3214) which are connected in sequence; the length of the first straight line (3211) is less than that of the second straight line (3213), and both the first circular arc line (3212) and the second circular arc line (3214) are convex outwards; the first arc line (3212) and the second arc line (3214) are axisymmetrically arranged with a line connecting a midpoint of the first straight line (3211) and a midpoint of the second straight line (3213) as central axes;

the receiving through hole (232) comprises a rectangular hole portion (2321) and a circular hole portion (2322) which are communicated with each other, the diameter of the circular hole portion (2322) is larger than the length of the rectangular hole portion (2321), and the length of the rectangular hole portion (2321) is larger than the distance between the first straight line (3211) and the second straight line (3213); the length of the first straight line (3211) is greater than the diameter of the circular hole (2322);

the movable connecting part (321) penetrates through the receiving through hole (232) and penetrates into the sleeve (230).