CN112451062B - Cerebrovascular intervention puncture positioning device - Google Patents

Abstract

The invention discloses a cerebrovascular intervention puncture positioning device, which comprises an outer ring seat, an inner ring rotating body, a parallel four-connecting-rod group, a guide sleeve and an adjusting rotating shaft, wherein a plurality of rows of clamping strips are distributed on the upper part of the circumferential edge of the outer ring seat at equal intervals, the inner ring rotating body is sleeved on the inner side of the outer ring seat in a matching mode and can rotate relatively, the parallel four-connecting-rod group is hinged to the inner wall of the inner ring rotating body, the guide sleeve is installed in the middle of the parallel four-connecting-rod group, and the adjusting rotating shaft on the outer side of the lower part of the guide sleeve is sequentially sleeved in circular shaft holes at corresponding positions in adjusting holes of an upper longitudinal plate and a lower longitudinal plate. The invention is easy to adjust and master when in use. The clamping strips are distributed on the edge of the clamped outer ring and used for locking the rotation of the inner ring rotating body and the parallel four-connecting-rod group at the same time, so that the function of locking the angle and the direction at the same time is achieved.

Description

Cerebrovascular intervention puncture positioning device

Technical field

The invention relates to the field of cerebrovascular interventional treatment instruments, in particular to a cerebrovascular interventional puncture positioning device.

Background

Cerebrovascular interventional puncture is an operation procedure of whole cerebral angiography, and generally, a puncture needle is placed into a femoral artery after local anesthesia of a right femoral artery, and then, a contrast agent is injected to display the shape of the whole cerebral vessels and the like. In the process of operation, anesthesia, other medicines and the like are often required to be injected into the operation position, so that the puncture position needs to be positioned for treatment operation, and the indwelling stability of the puncture needle is ensured.

Although the existing puncture positioning device can meet the basic use requirements, the defects are also quite obvious, and the main table of the puncture positioning device is as follows: in the process of puncture positioning of cerebral vessels, the angle, the direction, the depth and the like of puncture are required to be adjusted, the traditional puncture is manually and directly operated, an auxiliary device is lacked in the process of puncture positioning, and the puncture is easy to miss. The existing puncture positioning device generally has the problem of complex structure, and in order to realize the function of adjusting a plurality of angular positions, the whole structure is complex and difficult to effectively use and is usually idle due to the fact that a plurality of adjusting and locking components are required. The existing simple auxiliary positioning tools have incomplete positioning and adjusting functions or are not good to use, and are difficult to effectively popularize and apply.

Disclosure of Invention

Aiming at the problems of poor guidance quality or complex structure existing in the prior cerebrovascular interventional puncture instrument, the invention provides a cerebrovascular interventional puncture positioning device which is simple to operate, stable and accurate through simplified structural design.

The technical scheme for solving the technical problem is as follows: the cerebrovascular intervention puncture positioning device comprises an outer ring seat, an inner ring rotating body, a parallel four-connecting-rod group, a guide sleeve and an adjusting rotating shaft, wherein the outer ring seat is of a circular ring structure, a plurality of rows of clamping strips are distributed on the upper part of the circumferential edge at equal intervals, a fit gap exists between every two adjacent clamping strips, and a connecting component is arranged on the lower part of the circumferential edge of the outer ring seat; the inner ring rotating body is of a circular ring structure, is sleeved on the inner side of the outer ring seat in a matching mode and can rotate relatively, four symmetrical hinge seats are sequentially fixed on the inner wall of the inner ring rotating body, the parallel four-connecting-rod group comprises four vertical plates and four longitudinal plates, two ends of two upper longitudinal plates are hinged to the upper portion of the same side vertical plate through hinge pins respectively, two ends of two lower longitudinal plates are hinged to the lower portion of the same side vertical plate through hinge pins respectively, and the bottoms of the four vertical plates are hinged to corresponding hinge seats through hinge pins respectively; the middle part of each longitudinal plate is provided with a regula adjusting hole, a plurality of convex parts are distributed in the adjusting hole at intervals, and the area between the adjacent convex parts is a circular shaft hole; the guide sleeve is of a tubular structure, the two outer sides of the upper part and the lower part of the guide sleeve are respectively and vertically fixed with an adjusting rotating shaft, a plurality of clamping tables are alternately distributed on the outer side of the adjusting rotating shaft, or a blocking sleeve is sleeved on the outer side of the adjusting rotating shaft; four adjusting rotating shafts on the lower part of the guide sleeve are sequentially sleeved in round shaft holes at corresponding positions in the adjusting holes of the upper and lower longitudinal plates; when the parallel four-bar linkage swings to one side, the guide sleeve can be driven to synchronously swing for an angle, and a series of clamping strips positioned on the upper side of the outer ring seat are used for clamping and fixing vertical plates of the swung parallel four-bar linkage.

A guide rail structure is arranged between the outer ring seat and the inner ring rotating body to ensure that the outer ring seat and the inner ring rotating body can not be separated at will but can rotate.

The guide rail structure is characterized in that an inner ring strip protruding outwards is arranged in the middle of the inner circumferential side wall of the outer ring seat, an outer ring groove is arranged in the middle of the outer circumferential side wall of the inner ring rotating body, and the inner ring strip is sleeved in the outer ring groove in a matching mode and can rotate freely.

The outer ring seat is a circular ring body formed by butt joint and combination of a left symmetrical semicircular ring and a right symmetrical semicircular ring, and a connecting seat is conveniently arranged on a butt joint surface and is in through connection through screws.

The lower part of outer ring seat circumferential edge reason is provided with the fixing base, and each fixing base is connected with the fixed band, and the fixed band has contained the face that can paste, perhaps the end design of fixed band has the connector link.

The outer side of each longitudinal plate is sleeved with a rectangular sliding sleeve, the distance between the left side wall and the right side wall of the rectangular inner cavity of the sliding sleeve is equal to the thickness of the corresponding longitudinal plate, and the distance between the upper side wall and the lower side wall of the sliding sleeve is slightly larger than the height of the corresponding longitudinal plate.

The middle part of one side or two sides of the sliding sleeve is provided with an axle tube which protrudes outwards, and the adjusting rotating shaft is sleeved in the corresponding axle tube.

Convex-concave friction grains are arranged between the inner wall of the shaft tube and the outer circumferential wall of the adjusting shaft and used for providing damping effect on the axial sliding and the rotation of the adjusting shaft.

The inner ring rotating body is a combined annular body formed by butt joint and combination of an upper annular body and a lower annular body, an inward sunken outer annular groove is formed on a butt joint surface, and the upper annular body and the lower annular body are connected together through screws.

The four-bar linkage type vertical plate mechanism is characterized by further comprising arc-shaped clamping sleeve caps which are fixedly matched with the tops of the clamping strips, and when the vertical plates of the parallel four-bar linkage swing to one side to enter the adjacent clamping strips, the clamping strips are simultaneously fixed together in a linkage mode through the arc-shaped clamping sleeve caps.

The invention has the beneficial effects that: in order to improve the stability and reliability of the cerebrovascular interventional puncture positioning, the invention provides a puncture positioning device which is used for assisting the implementation of a cerebrovascular puncture operation. The device has fewer structural components and low cost, and is easy to adjust and master during use. The clamping strips are distributed on the edge of the clamped outer ring and used for locking the rotation of the inner ring rotating body and the parallel four-connecting-rod group at the same time, so that the function of locking the angle and the direction at the same time is achieved.

The control of the swing angle of the parallel four-bar linkage can directly act on the angle control of the guide pipe. The operation process only needs to be realized by driving the parallel four-connecting-rod group to rotate and swing by hands, and the operation is simple and convenient.

The invention has the function of adjusting the guide tube in the transverse direction and the longitudinal direction at the same time, and the function can be used when the deviation of the fixed position range of the outer ring seat is large. The adjusting device comprises a guide pipe, a baffle sleeve, a guide pipe, an adjusting sleeve and an adjusting sleeve, wherein the baffle sleeve is sleeved on the guide pipe, the adjusting sleeve is sleeved on the guide pipe, and the adjusting sleeve is fixedly sleeved on the guide pipe.

Drawings

Fig. 1 is an external structural view of a positioning device of the present invention.

Fig. 2 is a view showing the assembly relationship between the outer ring holder and the inner ring rotator in fig. 1.

Fig. 3 is a side view of fig. 2.

Fig. 4 is a view of the angle adjustment process of the parallel four-bar linkage from upright to inclined.

Fig. 5 is a side view of fig. 4.

Fig. 6 is a schematic view of the lateral and longitudinal adjustment of the guide sleeve.

Fig. 7 is a front view of the vertical plate.

Fig. 8 is a perspective view of the guide sleeve in fixed relation to the adjustment shaft.

Fig. 9 is a front view of fig. 8.

Fig. 10 is a view showing an alternative installation relationship of the guide sleeve and the adjustment rotary shaft.

Reference numbers in the figures: the adjustable rotary shaft comprises an outer ring seat 1, an inner ring strip 11, a clamping strip 12, a fixed seat 13, a fixed belt 14, an inner ring rotating body 2, an outer ring groove 21, a hinged seat 22, a parallel four-link group 3, a vertical plate 31, an upper longitudinal plate 32, a lower longitudinal plate 33, an adjusting hole 34, a protruding part 35, a guide sleeve 4, an adjusting rotary shaft 5, a clamping table 51, a blocking sleeve 52 and an adjusting sleeve 53.

Detailed Description

Example 1: a cerebrovascular intervention puncture positioning device as shown in figure 1 mainly comprises an outer ring seat 1, an inner ring rotator 2, a parallel four-link group 3, a guide sleeve 4 and the like. The outer ring seat 1 and the inner ring rotating body 2 can rotate relatively after being sleeved, and the parallel four-connecting-rod group 3 can obliquely swing to one side while rotating on the basis of the inner ring rotating body, so as to drive the guide sleeve 4 to swing to one side. Thereby, the angle adjustment of the insertion position, the direction adjustment of the insertion position, and the like can be realized.

Specifically, as shown in fig. 2 and 3, the outer ring base 1 is a circular ring structure, a plurality of rows of clamping strips 12 are distributed on the upper portion of the circumferential edge at equal intervals, a fit gap exists between adjacent clamping strips 12, and a connecting member is arranged on the lower portion of the circumferential edge of the outer ring base 1. The inner ring rotator 2 is in a circular ring structure, and is sleeved on the inner side of the outer ring seat 1 in a matching manner and can rotate relatively.

A guide rail structure is arranged between the outer ring seat 1 and the inner ring rotator 2 to ensure that the two can not be separated at will but can rotate. For example, as shown in fig. 2 and 3, an inner ring strip 11 is disposed inside the ring of the outer ring seat 1, and an outer ring groove 21 is disposed on the outer ring wall of the inner ring rotator 2, and the two are fitted together in a matching manner and can rotate relatively.

As shown in fig. 1, the lower portion of the circumferential edge of the outer ring seat 1 is provided with fixing seats 13, each fixing seat 13 is connected with a fixing band 14, the fixing band 14 includes a surface capable of being adhered, or the end of the fixing band 14 is designed with a connecting buckle.

As can be seen from fig. 4, four symmetrical hinge seats 22 are sequentially fixed on the inner wall of the inner ring rotator 2. The parallel four-bar linkage 3 comprises four vertical plates 31 and four longitudinal plates, wherein two ends of two upper longitudinal plates 32 are respectively hinged to the upper part of the same side vertical plate through pin shafts, two ends of two lower longitudinal plates 33 are respectively hinged to the lower part of the same side vertical plate through pin shafts, and the bottoms of the four vertical plates are respectively hinged to corresponding hinge seats through pin shafts. The middle part of each upper vertical plate 32 is provided with a regula adjusting hole 34, a plurality of convex parts 35 are distributed in the adjusting holes at intervals, and the area between the adjacent convex parts 35 is a circular shaft hole.

The guide sleeve 4 is a tubular structure, the two sides of the upper part and the lower part of the guide sleeve are respectively and vertically fixed with an adjusting rotating shaft 5, a plurality of clamping platforms 51 are alternately distributed on the adjusting rotating shaft 5, or a blocking sleeve 52 is sleeved on the adjusting rotating shaft 5. Specifically, as shown in fig. 8 and 9, four adjusting rotating shafts on the upper and lower parts of the guide sleeve 4 are sequentially sleeved in circular shaft holes at corresponding positions in the adjusting holes of the upper and lower longitudinal plates, the parallel four-bar linkage 3 can simultaneously drive the guide sleeve 4 to synchronously swing by an angle when swinging to one side, and a series of clamping strips 12 positioned on the upper side of the outer ring seat 1 are used for clamping and fixing vertical plates of the swung parallel four-bar linkage 3.

The device is used by securing the outer annular seat, typically by a securing strap, to the medial femoral artery, the outer annular seat serving to provide a stable adjustment base. When rotating the inner ring rotator 2, it is usually necessary to first put it in an upright state as shown in fig. 4 and 5, and the inner ring rotator is rotated without being restrained by the locking strips 12. The purpose of rotating the inner ring rotator 2 is to ensure that the guide sleeve 4 can be at a proper alignment angle, then the parallel four-bar linkage 3 is pressed to one side, and at the moment, the vertical plate on the inclined side of the parallel four-bar linkage 3 enters the adjacent clamping strip 12 to be clamped and fixed. The clamping strip is rough in surface, has certain clamping force and elasticity, can clamp the corresponding vertical plate and prevent the vertical plate from sliding, and is reliable in the absence of external force. From the perspective of improving the fixing effect of the clamping strips 12, the clamping force and the anti-skidding effect can be improved by compounding one side rubber layer on the surface of each clamping strip or coating an adhesive substance layer on the surface of each clamping strip. Through the clamping and fixing effect of the clamping strips 12 on the parallel four-bar linkage 3, the parallel four-bar linkage 3 can be fixed, and the inner ring rotator 2 can also be fixed to prevent the inner ring rotator from rotating again. The adjustment of the angle of inclination can be determined according to the degree to which the parallel four-bar linkage 3 is compressed. The embodiment further controls the adjusting rotating shaft 5 to be positioned in the adjusting hole 34 at the response position through the adjusting rotating shaft 5 positioned on the upper side and the lower side of the guide sleeve and the adjusting hole 34 positioned on each longitudinal plate. A plurality of convex parts 35 are distributed in the adjusting holes at intervals, so that the area between the adjacent convex parts 35 is a circular shaft hole and is used for clamping each adjusting shaft, and the guide sleeve can have the function of moving back and forth. When the distance between the two side longitudinal plates is designed to be wider, and a plurality of clamping platforms 51 are further distributed on the adjusting rotating shaft 5 in an alternating mode, as shown in fig. 8 and 9, the possibility of transverse movement of the adjusting sleeve is provided. Adjacent as shown in fig. 6. The clamping table 51 is positioned on two sides of the adjusting hole, so that the position of the adjusting rotating shaft 5 can be restrained to be unchanged, and the clamping table can span the adjusting hole 34 when the adjusting rotating shaft 5 is pushed, so that the transverse movement adjustment of the guide sleeve is realized. For the restriction of the adjusting rotating shaft 5, as shown in fig. 4, a blocking sleeve 52 is sleeved on the adjusting rotating shaft 5, the blocking sleeve 52 and the adjusting rotating shaft are fixed in a sleeved manner, the blocking sleeve is pushed by force to slide transversely, and the blocking sleeve is supported on the side surface of the adjusting hole 34 of the vertical plate and used for restricting the adjusting rotating shaft 5 and further restricting the guide sleeve 4 to prevent the guide sleeve from sliding transversely at will.

The rotation adjustment, the angle adjustment, the longitudinal adjustment and the transverse adjustment of the guide pipe are mutually matched, so that the adjustment and the positioning of any angle at any position can be realized. The device has simple structure and easy operation and use. The guide tube longitudinal adjustment and the transverse adjustment are not necessary adjustment steps, and the guide tube is installed at a proper position before use, and usually the rotation adjustment and the angle adjustment can meet the requirements.

Example 2: in the above embodiment 1, the four adjusting shafts 5 located at the upper and lower sides of the guide sleeve are relatively fixed, and the application aims to provide an installation relationship that can synchronously swing along with the parallel four-bar linkage 3 as shown in fig. 4 and 5. As can be seen from fig. 4 and 5, when each vertical rod becomes the vertical state, the guide sleeve 4 is also in the vertical state, and when each vertical rod is inclined to one side, the guide sleeve 4 is also inclined to one side, so that the guide sleeve 4 and the parallelogram linkage 3 together form a connected parallelogram functional component and a linkage relationship.

However, in the present embodiment, the structure shown in fig. 10 is adopted, and it can be seen from the figure that, two adjusting rotating shafts 5 at one end are vertically fixed at two sides of an adjusting sleeve 53, the adjusting sleeve 53 is sleeved outside the guide sleeve 4, and the degree of the sleeving between the adjusting sleeve 53 and the guide sleeve 4 needs to push the retaining sleeve forcibly to enable the retaining sleeve to slide along the axial direction. Therefore, when the adjusting sleeve 53 is located at different positions on the guiding sleeve 4, the distance between the two upper adjusting rotating shafts and the two lower adjusting rotating shafts can be changed, and the distance is changed, when the guiding sleeve 4 is installed in the adjusting hole 43 of each vertical plate, a pre-designed inclination phenomenon occurs, for example, when each vertical plate is located in the vertical state as shown in fig. 5, the guiding sleeve may be at a pre-designed inclination angle α, and when the parallel four-bar linkage 3 swings to one side, the guiding sleeve 4 still swings synchronously along with each vertical rod, and the difference is only that the difference between the swinging angle of the guiding sleeve and the swinging angle of the vertical plate is α.

On the basis of the above embodiments, the present invention may also have other forms of modifications or additional embodiments, and all should fall within the scope covered by the technical solution of the present invention. For example, the design snap-gauge distributes in an auxiliary ring upside, and the auxiliary ring cover is fixed in outer ring seat upside, fixes through viscose or screw. Thereby can design the outer ring seat and be rigid material, two auxiliary rings and cardboard are the plastics material. The cardboard is dipped or coated with rubber or viscose material to improve the holding force. The inner ring rotating body can also be composed of an upper part and a lower part, and a structure with an outer ring groove is formed after the inner ring rotating body is sleeved and fixed. For example, the guide sleeve may be of any suitable type, such as cylindrical or conical configuration. Or the clamping plates positioned on the upper side of the outer ring seat are not completely distributed in a circumferential manner, but are only distributed in a half or a part, so that the angle and direction adjusting and clamping functions of the parallel four-link group can be met. Or the two side surfaces of each vertical plate are designed to be parallel along the radial direction so as to be conveniently inserted into each clamping plate in a matching mode and be fully attached. For example, a locking wire is installed on any pin shaft, and after the angle and the position of the parallel four-bar linkage are fixed by a clamping plate, the joint part of the parallel four-bar linkage is locked by further screwing the locking wire. Or each adjusting rotating shaft is connected in a corresponding screw hole on the side surface of the guide sleeve through threads. For example, the longitudinal plate is provided with an adjusting groove, the longitudinal plate is usually made of plastic materials such as PVC materials, the upper wall and the lower wall of the adjusting groove can automatically return after being deformed, when the longitudinal plate is thin or the elastic pressure of the upper wall and the lower wall of the adjusting groove is insufficient, a sliding flat sleeve is sleeved on the outer side of the longitudinal plate and is close to the position of the adjusting rotating shaft as much as possible, the adjusting groove on the longitudinal beam is restrained, and the middle part of the adjusting groove is prevented from being loosened. Or a structure is adopted as shown in fig. 7, which is provided with a flat sleeve 6 and comprises an axle tube 61, the flat sleeve is sleeved outside the longitudinal plate, the width a of the flat sleeve is larger than the width b of the longitudinal plate, the longitudinal plate is allowed to be expanded moderately but not excessively, the axle tube 61 corresponds to the position of the axle hole on the longitudinal plate, the adjusting rotating shaft positioned outside the guide sleeve penetrates through the axle tube 61, and the like.

Claims (10)

1. A cerebrovascular intervention puncture positioning device is characterized by comprising an outer ring seat (1), an inner ring rotating body (2), a parallel four-connecting-rod group (3), a guide sleeve (4) and an adjusting rotating shaft (5), wherein the outer ring seat (1) is of a circular ring structure, a plurality of rows of clamping strips (12) are distributed on the upper part of the circumferential edge at equal intervals, a fit clearance exists between every two adjacent clamping strips (12), and a connecting component is arranged on the lower part of the circumferential edge of the outer ring seat (1); the inner ring rotating body (2) is of a circular ring structure, is sleeved on the inner side of the outer ring seat (1) in a matching mode and can rotate relatively, four symmetrical hinged seats (22) are sequentially fixed on the inner wall of the inner ring rotating body (2), the parallel four-connecting-rod group (3) comprises a first parallel four-connecting rod and a second parallel four-connecting rod which are arranged in parallel, the first parallel four-connecting rod and the second parallel four-connecting rod are identical in structure, the first parallel four-connecting rod comprises two vertical plates (31), an upper longitudinal plate (32) and a lower longitudinal plate (33) are horizontally hinged between the two vertical plates through hinge pins respectively, and the bottoms of the vertical plates are hinged to the corresponding hinged seats through hinge pins respectively; a regula adjusting hole (34) is arranged in the middle of each longitudinal plate, a plurality of convex parts (35) are distributed in the adjusting hole at intervals, and the area between every two adjacent convex parts (35) is a circular shaft hole; the guide sleeve (4) is of a tubular structure, the two outer sides of the upper part and the lower part of the guide sleeve are respectively and vertically fixed with an adjusting rotating shaft (5), a plurality of clamping platforms (51) are alternately distributed on the outer side of the adjusting rotating shaft (5), or a blocking sleeve (52) is sleeved on the outer side of the adjusting rotating shaft (5); four adjusting rotating shafts on the upper and lower parts of the guide sleeve (4) are sequentially sleeved in round shaft holes at corresponding positions in the adjusting holes of the upper and lower longitudinal plates; when the parallel four-bar linkage (3) swings to one side, the guide sleeve (4) can be driven to synchronously swing for an angle, and a series of clamping strips (12) positioned on the upper side of the outer ring seat (1) are used for clamping and fixing vertical plates of the swung parallel four-bar linkage (3).

2. The cerebrovascular interventional puncture positioning device according to claim 1, characterized in that a guide rail structure is arranged between the outer ring seat (1) and the inner ring rotator (2) to ensure that the two can not be separated at will but can rotate.

3. The positioning device for cerebrovascular interventional puncture according to claim 2, wherein the guiding track structure is that an inner ring strip (11) protruding outwards is arranged in the middle of the inner circumferential side wall of the outer ring seat (1), an outer ring groove (21) is arranged in the middle of the outer circumferential side wall of the inner ring rotator (2), and the inner ring strip (11) is sleeved in the outer ring groove (21) in a matching way and can rotate freely.

4. The cerebrovascular intervention puncture positioning device according to claim 3, wherein the outer ring seat (1) is a circular ring body formed by butt-joint combination of a left half ring and a right half ring, and a connecting seat is conveniently arranged on a butt-joint surface and is connected through a screw.

5. The cerebrovascular intervention puncture positioning device according to claim 1, wherein the lower portion of the circumferential edge of the outer ring seat (1) is provided with a fixing seat (13), each fixing seat (13) is connected with a fixing band (14), the fixing bands (14) comprise surfaces capable of being adhered, or the tail ends of the fixing bands (14) are designed with connecting buckles.

6. The positioning device for cerebrovascular interventional puncture according to claim 1, wherein a rectangular sliding sleeve is sleeved outside each longitudinal plate, the distance between the left and right side walls of the rectangular inner cavity of the sliding sleeve is equal to the thickness of the corresponding longitudinal plate, and the distance between the upper and lower side walls of the sliding sleeve is slightly larger than the height of the corresponding longitudinal plate.

7. The cerebrovascular interventional puncture positioning device as set forth in claim 6, wherein the middle part of one side or both sides of the sliding sleeve is provided with an outward protruding shaft tube, and the adjusting rotating shaft (5) is sleeved in the corresponding shaft tube.

8. The positioning device for cerebrovascular interventional puncture according to claim 7, wherein the inner wall of the shaft tube and the outer circumferential wall of the adjusting shaft are provided with convex-concave friction lines for providing damping effect to the axial sliding and rotation of the adjusting shaft.

9. The cerebrovascular interventional puncture positioning device as set forth in claim 3, wherein the inner rotating body (2) is a combined torus formed by butt-jointing and combining an upper torus and a lower torus, and an inwardly recessed outer annular groove is formed on the butt-jointing surface, and the upper torus and the lower torus are connected together by screws.

10. The cerebrovascular intervention puncture positioning device according to claim 1, further comprising an arc-shaped sleeve cap matched and fixed at the top of the plurality of clamping strips, and when the vertical plate (31) of the parallel four-bar linkage (3) swings to one side and enters the adjacent clamping strips, the plurality of clamping strips are simultaneously fixed together in a linkage manner through the arc-shaped sleeve cap.

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