CN114711835A - Amniotic fluid sampler for obstetrical medical treatment - Google Patents

Abstract

The invention discloses a amniotic fluid sampler for obstetrical medical treatment, which relates to the technical field of medical instruments and comprises a needle cylinder, wherein one end of the needle cylinder is provided with a connector, the other end of the needle cylinder is provided with an opening, a needle head is detachably arranged on the connector, a push rod is arranged in the needle cylinder in a sealing and sliding manner, so that a sampling space is formed among the needle cylinder, the needle head and the push rod, the needle head comprises a needle sleeve and a needle core, the needle sleeve and the needle core are coaxially and hermetically and rotatably connected, the puncture ends of the needle sleeve and the needle core are provided with inclined openings with the same shape, a flow passage is arranged in the needle core, one end of the flow passage is communicated with the connector, the other end of the flow passage penetrates through the outer wall of the needle core, when the two inclined openings are superposed, the flow passage is in a sealed state, and when the two inclined openings are staggered, the flow passage is exposed. In the puncture process, the cell tissue cannot be hung and carried into the amniotic fluid by the needle head, so that the purity of the amniotic fluid sample collection is improved.

Description

Amniotic fluid sampler for obstetrical medical treatment

Technical Field

The invention relates to the technical field of medical instruments, in particular to an amniotic fluid sampler for obstetrical medical treatment.

Background

The fluid filling the amniotic cavity is called amniotic fluid. The origin, amount and composition of amniotic fluid vary with the week of pregnancy. In the early stage of pregnancy, amniotic fluid is mainly the dialysate of maternal serum which enters the amniotic cavity through the placenta, and a small amount of the dialysate seeps out of the surface of the placenta and the surface of the umbilical cord. After the fetal blood circulation is formed, the moisture and small molecules in the fetal body can seep out through the skin of the fetus which is not yet keratinized to form a part of the amniotic fluid.

In the gynaecology and obstetrics field, regularly carry out the sample detection to the lying-in woman amniotic fluid and can confirm the health status of foetus and parent effectively, in time discover to hide the illness and develop corresponding treatment, among the prior art, generally puncture the sample through the pjncture needle, because current sample pjncture needle all is the cavity setting, and the tip is the design of sharp bevel connection, easily will not belong to the subcutaneous cell tissue of amniotic fluid when the puncture and stay in the syringe needle, bring into the amniotic fluid sample along with the extraction of amniotic fluid, just so can influence the pure degree of amniotic fluid, influence the accuracy of inspection result, still cause the infection easily.

Disclosure of Invention

The invention aims to solve the problem that in the prior art, a puncture needle is easy to bring subcutaneous cell tissues which do not belong to amniotic fluid into an amniotic fluid sample, so that the purity degree of the amniotic fluid is influenced, and provides an amniotic fluid sampler for obstetrical medical treatment.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a amniotic fluid sampler for obstetrical department's medical treatment, includes the cylinder, cylinder one end is provided with connector, the other end sets up for the opening, demountable installation has the syringe needle on the connector the cylinder internal seal slides and is provided with the push rod, makes form sample space between cylinder, syringe needle and the push rod, the syringe needle includes needle cover and nook closing member, needle cover and the coaxial sealed rotation of nook closing member are connected, the needle cover is provided with the bevel connection of the shape unanimity with the puncture end of nook closing member set up the runner in the nook closing member, runner one end with connector intercommunication, the outer wall of nook closing member are run through to the other end, when two when the bevel connection position coincides, the runner is in encapsulated situation, when two during the bevel connection dislocation, the runner is exposed.

Preferably, the end of the needle sleeve is provided with a connecting cap, and the connecting cap is inserted into the connecting head.

Preferably, the outer peripheral surface of the connector is provided with a plurality of limiting keys, and the inner wall of the connecting cap is provided with a plurality of key grooves matched with the limiting keys.

Preferably, the end of the needle core is provided with a sealing ring, the sealing ring is provided with a sealing groove with the same size as the connector, and the connector is abutted against the sealing groove.

Preferably, the cylinder has been close to connector one side and has been seted up the leakage fluid dram, it is equipped with the lantern ring to rotate the cover on the cylinder, through a many connecting rods fixed connection between the lantern ring and the stylet, the lantern ring covers the leakage fluid dram, be connected with the flowing back pipe on the lantern ring, rotate when the lantern ring makes flowing back pipe and leakage fluid dram coincidence intercommunication, the runner is in the encapsulated situation when the runner is opened, flowing back pipe and leakage fluid dram dislocation are sealed.

Preferably, the push rod comprises a piston, a pressing sheet and two connecting plates which are perpendicular to each other and arranged in a crossed manner, the piston is arranged in the needle cylinder in a sealing and sliding manner, and the pressing sheet is fixedly connected with the piston through the connecting plates.

Preferably, the syringe further comprises a reversing limiting mechanism arranged on the syringe, the reversing limiting mechanism comprises four sliding columns which are arranged on the syringe in a radial sliding mode, a limiting structure used for limiting the push rod to move in a one-way mode is arranged between the sliding columns and the connecting plate, and a control structure used for controlling the sliding columns to move in the radial mode is arranged between the sliding columns and the lantern ring.

Preferably, limit structure sets up in the wedge of traveller tip including sliding, be equipped with the spring between wedge and the traveller, and adjacent two wedge reverse setting on the traveller, the triangular groove with the wedge looks adaptation that corresponds is seted up at the connecting plate edge, works as after the wedge extends into the triangular groove, the push rod can only follow wedge incline direction unidirectional movement.

Preferably, the control structure is including fixed setting up in the snap ring that is "C" type setting of traveller tip, a plurality of snap ring swing joint has same elliptical ring, through two fixed connection of many connecting rods between the lantern ring and the elliptical ring.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the needle head with the needle sleeve and the needle core is arranged, the opening of the flow channel in the needle core is arranged on the side instead of the puncture end, the cell tissue cannot be hung down and brought into the amniotic fluid by the needle head in the puncture process, the needle core can be rotated after the puncture is finished, so that the flow channel is exposed, and the amniotic fluid sample is extracted, thereby being beneficial to improving the purity of the acquisition of the amniotic fluid sample and reducing the risk of blockage of the needle head on the one hand, and solving the problem that the purity of the amniotic fluid is influenced because the subcutaneous cell tissue which does not belong to the amniotic fluid is easily brought into the amniotic fluid sample by the puncture needle in the prior art.

2. According to the amniotic fluid sampler, the liquid discharge port, the sleeve ring and the liquid discharge conduit are arranged, the sleeve ring is connected with the sealing ring on the needle core through the connecting rod, so that the needle core rotates along with the rotation of the sleeve ring, the opening and closing of the flow channel and the liquid discharge port are changed, amniotic fluid can be continuously and repeatedly extracted by the amniotic fluid sampler and discharged from the liquid discharge port, and the interior of the needle cylinder is rinsed by the amniotic fluid, so that a sample for amniotic fluid detection is cleaner, and a detection result is more accurate.

3. According to the invention, by arranging the elliptical ring, when the lantern ring is rotated, the elliptical ring is synchronously driven to rotate, so that the elliptical ring drives the snap ring to move, the sliding columns radially move for different distances, the wedge blocks on the two sliding columns at the short axis position of the elliptical ring can be matched with the triangular groove, and the wedge blocks on the two sliding columns at the long axis position of the elliptical ring are separated from the triangular groove, so that the wedge blocks can perform one-way limiting on the push rod, meanwhile, the lantern ring is rotated to synchronously change the limiting direction of the push rod, so that only liquid pushing can be performed when the liquid discharge port is opened, and only liquid pumping can be performed when the flow channel is opened, thereby reducing the risk of misoperation of medical personnel and reducing the potential safety hazard of the puncture needle in the use process.

Drawings

Fig. 1 is a schematic view showing the overall structure of an amniotic fluid sampler for obstetrical medical treatment according to the present invention;

FIG. 2 is a schematic view of the overall structure of an amniotic fluid sampler for obstetrical medical treatment according to the present invention;

fig. 3 is a schematic front view of an amniotic fluid sampler for obstetrical medical treatment according to the present invention;

fig. 4 is a schematic diagram of an exploded structure of an amniotic fluid sampler for obstetrical medical treatment according to the present invention;

FIG. 5 is a schematic structural view of a needle of an amniotic fluid sampler for obstetrical medical treatment according to the present invention;

FIG. 6 is a schematic structural view of a push rod of the amniotic fluid sampler for obstetrical medical treatment according to the present invention;

FIG. 7 is a schematic structural view of a slide column in an amniotic fluid sampler for obstetrical medical treatment according to the present invention;

FIG. 8 is a schematic cross-sectional view taken along line A-A' of FIG. 3;

fig. 9 is a schematic structural view of a connection relationship between a needle head and a connector of an amniotic fluid sampler for obstetrical medical treatment according to the present invention.

In the figure: 1. a needle cylinder; 12. a liquid discharge port; 13. a collar; 14. a drainage conduit; 2. a connector; 3. a needle head; 31. a needle sleeve; 311. a connecting cap; 32. a needle core; 321. a seal ring; 33. a bevel opening; 34. a flow channel; 4. a push rod; 41. a piston; 42. pressing the sheet; 43. a connecting plate; 5. a traveler; 51. a wedge block; 52. a spring; 53. a triangular groove; 54. a snap ring; 6. an elliptical ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Referring to fig. 1-3, a amniotic fluid sampler for obstetrical medical treatment, including cylinder 1, cylinder 1 one end is provided with connector 2, the other end is the opening setting, demountable installation has syringe needle 3 on connector 2, syringe needle 3 is disposable syringe needle, can abandon syringe needle 3 after using, more sanitary safety, sealed slip is provided with push rod 4 in cylinder 1, make and form the sample space between cylinder 1, syringe needle 3 and push rod 4, through pull push rod 4, make the atmospheric pressure intensity change in cylinder 1, realize the drawing liquid through the pressure change.

Referring to fig. 4-5, the needle 3 comprises a needle sheath 31 and a needle core 32, the needle sheath 31 and the needle core 32 are made of stainless steel, the needle sheath 31 and the needle core 32 are coaxially and hermetically connected, the puncturing ends of the needle sheath 31 and the needle core 32 are provided with bevel mouths 33 with the same shape, when puncturing is performed through the bevel mouths 33, the contact area between the puncturing end of the needle 3 and the skin of a puerperal woman is smaller, so that the puncture is more convenient, a flow passage 34 is formed in the needle core 32, one end of the flow passage 34 is communicated with the connector 2, and the other end penetrates through the outer wall of the needle core 32, when the positions of the two bevel mouths 33 are overlapped, the flow passage 34 is in a sealed state, at the moment, the two bevel mouths 33 are flush, the puncturing end of the needle 3 is of a solid structure, subcutaneous cell tissues which do not belong to amniotic fluid can not be left in the needle 3 and brought into the amniotic fluid during the puncturing process, so that the cleanliness of the amniotic fluid sample is improved, and the risk of the cell tissues blocking the needle hole is reduced, when the two inclined openings 33 are dislocated, the runner 34 is exposed, after the needle head 3 is punctured into the amniotic fluid, the needle core 32 can be rotated to dislocate the two inclined openings 33, the runner 34 is exposed, and the amniotic fluid can be extracted by pulling the push rod 4.

Referring to fig. 4-5, in order to improve the accuracy of amniotic fluid sampling detection, after the amniotic fluid is taken out, the syringe 1 is generally rinsed with the first extracted amniotic fluid sample, and then the amniotic fluid sample is extracted again after being discharged, in the prior art, the syringe is pulled off from the needle, and then the rinsed amniotic fluid is discharged and then the syringe is connected with the needle, so that the operation is complicated and the infection risk exists, therefore, a liquid discharge port 12 is formed in one side of the syringe 1 close to the connector 2, the rinsed amniotic fluid can be discharged from the liquid discharge port 12 out of the syringe 1, a collar 13 is rotatably sleeved on the syringe 1, the collar 13 is fixedly connected with a needle core 32 through a plurality of connecting rods, the collar 13 and the needle core 32 rotate synchronously, the collar 13 covers the liquid discharge port 12, the liquid discharge port 12 is kept in a sealed state in a normal state, a liquid discharge conduit 14 is connected on the collar 13, and when the collar 13 is rotated to enable the liquid discharge conduit 14 to be superposed and communicated with the liquid discharge port 12, runner 34 is in the enclosed state, promotes push rod 4 this moment, makes the amniotic fluid of rinsing discharge through drainage tube 14 from drain port 12 to make the amniotic fluid of rinsing can not be because push rod 4 promotes to return in the pregnant woman tripe, when runner 34 is opened, drainage tube 14 and drain port 12 dislocation are sealed, can extract the amniotic fluid once more this moment, because drain port 12 seals, the amniotic fluid of discharging can not follow drainage tube 14 internal reflux this moment.

Referring to fig. 6, the plunger 4 includes a piston 41, a pressing piece 42 and two connecting plates 43 perpendicularly crossing each other, the piston 41 is disposed in the syringe 1 in a sealing and sliding manner, the air pressure in the syringe 1 is changed by the movement of the piston 41, the pressing piece 42 is fixedly connected to the piston 41 by the connecting plates 43, when in use, the piston 41 can be pushed by pressing the pressing piece 42 with the thumb, and the piston 41 can be pulled out by pulling the pressing piece 42.

Referring to fig. 6-8, the syringe also comprises a reversing limit mechanism arranged on the syringe 1, the reversing limit mechanism comprises four sliding columns 5 which are arranged on the syringe 1 in a radial sliding manner, the four sliding columns 5 respectively correspond to four side edges of the connecting plate 43, a limit structure used for limiting the movement of the push rod 4 in a single direction is arranged between the sliding columns 5 and the connecting plate 43, when the flow passage 34 is opened and the liquid discharge port 12 is closed, only the push rod 4 is allowed to draw liquid, when the flow passage 34 is closed and the liquid discharge port 12 is opened, only the push rod 4 is allowed to discharge liquid, a control structure for controlling the radial movement of the slide post 5 is arranged between the slide post 5 and the lantern ring 13, the lantern ring 13 is rotated to change the opening and closing state of the flow passage 34 and the liquid discharge port 12 and simultaneously change the radial position of the slide post 5, thereby realize switching limit structure's spacing direction, avoid medical personnel to appear drawing liquid and flowing back maloperation in the use as far as possible.

Referring to fig. 6-8, the control structure includes snap rings 54 fixedly arranged at the end portions of the sliding columns 5 and arranged in a C shape, the snap rings 54 are movably connected with the same elliptical ring 6, the lantern ring 13 is fixedly connected with the elliptical ring 6 through a plurality of connecting rods, the elliptical ring 6 rotates along with the rotation of the lantern ring 13, and because the lengths of the short axis and the long axis of the elliptical ring 6 are different, when the elliptical ring 6 rotates, the snap rings 54 are pushed to move, so that the two opposite sliding columns 5 synchronously and radially move, and the two opposite sliding columns 5 are located at the short axis positions of the elliptical ring 6, and when the sliding columns are located at the inward-contracting limiting distance, the other two sliding columns 5 are located at the long axis positions of the elliptical ring 6 and are located at the outward-expanding limiting distance.

Referring to fig. 6-8, the limiting structure includes a wedge block 51 slidably disposed at an end of the sliding post 5, a spring 52 is disposed between the wedge block 51 and the sliding post 5, so that the wedge block 51 can move toward the sliding post 5 and compress the spring 52, and the wedge blocks 51 on two adjacent sliding posts 5 are disposed in opposite directions, and a triangular groove 53 adapted to the corresponding wedge block 51 is disposed at an edge of the connecting plate 43, and when the oblique edge of the wedge block 51 abuts against the oblique edge of the triangular groove 53, an oblique force is generated, so that the wedge block 51 compresses the spring 52, and the wedge block 51 is not blocked, and when the wedge block 51 moves in opposite directions, the straight edge of the wedge block 51 abuts against the straight edge of the triangular groove 53, at this time, the wedge block 51 cannot move continuously, and when the wedge block 51 extends into the triangular groove 53, the push rod 4 can only move in one direction along the oblique direction of the wedge block 51, thereby effectively reducing the risk of misoperation of a doctor.

In the above, firstly, the stylet 32 and the bevel opening 33 on the needle sheath 31 are in a superposed state, at this time, the runner 34 is sealed for puncture, after the puncture is completed, the lantern ring 13 is rotated, the lantern ring 13 drives the elliptical ring 6 and the stylet 32 to rotate synchronously, at this time, the runner 34 is opened, the liquid discharge port 12 is sealed, at the same time, one group of the sliding columns 5 which are oppositely arranged is positioned at the short axis position of the elliptical ring 6, so that the wedge block 51 extends into the triangular groove 53, the push rod 4 is limited unidirectionally, so that the push rod 4 can only be pulled out outwards to draw amniotic fluid, after the drawing is completed, the lantern ring 13 is rotated to enable the elliptical ring 6 and the stylet 32 to rotate synchronously, at this time, the runner 34 is closed, the liquid discharge port 12 is opened, at the same time, the group of the sliding columns 5 which are positioned at the short axis position of the elliptical ring 6 comes to the long axis position of the elliptical ring 6 along with the rotation of the elliptical ring 6, the other group of the sliding columns 5 are positioned at the short axis position of the elliptical ring 6, at this time, the wedge block 51 which is positioned in the triangular groove 53 is separated from the triangular groove 53, the wedge blocks 51 on the other two sliding columns 5 enter the triangular grooves 53 at corresponding positions to perform one-way limiting on the push rod 4, so that the push rod 4 can only push inwards to discharge the amniotic fluid from the liquid discharge port 12.

Referring to fig. 9, a connection cap 311 is disposed at an end of the needle sheath 31, and the connection cap 311 is inserted into the connector 2, so as to fix the needle sheath 31 and facilitate installation and replacement of the needle 3.

Referring to fig. 9, the outer peripheral surface of the connector 2 is provided with a plurality of limiting keys, the inner wall of the connecting cap 311 is provided with a plurality of key slots matched with the limiting keys, and the limiting keys and the limiting slots are matched, so that the connecting cap 311 and the connector 2 do not deflect when the stylet 32 rotates along with the lantern ring 13, the relative position between the needle sleeve 31 and the stylet 32 is convenient to change, and the opening and closing of the flow passage 34 is controlled.

Referring to fig. 9, a sealing ring 321 is disposed at an end of the needle core 32, a sealing groove having the same size as the connector 2 is disposed on the sealing ring 321, and the connector 2 abuts against the sealing groove, which is beneficial to improving the air tightness between the flow channel 34 and the connector 2.

The specific working principle of the invention is as follows:

when the device is used, the needle core 32 and the needle sleeve 31 are adjusted to be in a state of being overlapped with the bevel opening 33, the push rod 4 is pushed to the lowest end of the needle cylinder 1, the needle head 3 and the skin of the puncture part of a pregnant woman are disinfected, the needle head 3 is inserted from the puncture position after the disinfection is finished until the end part of the needle head 3 is subjected to amniotic fluid, after the puncture is finished, the lantern ring 13 is rotated, the lantern ring 13 drives the elliptical ring 6 and the needle core 32 to synchronously rotate, the flow channel 34 is opened at the moment, the fluid discharge opening 12 is sealed, meanwhile, the elliptical ring 6 rotates to change the position of each sliding column 5, and under the action of the reversing limiting mechanism, the push rod 4 is only allowed to be pulled out outwards at the moment to extract the amniotic fluid;

after extraction is completed, the lantern ring 13 is rotated to enable the elliptical ring 6 and the needle core 32 to synchronously rotate, the flow channel 34 is closed at the moment, the liquid discharge port 12 is opened, meanwhile, the elliptical ring 6 rotates to change the position of each sliding column 5, the push rod 4 only allows inward propulsion at the moment under the action of the reversing limiting mechanism, so that amniotic fluid extracted for the first time is discharged from the liquid discharge port 12 after being moistened in the needle cylinder 1, the lantern ring 13 is rotated again to extract the amniotic fluid, and the amniotic fluid sample with high purity can be obtained.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (9)

1. The utility model provides a amniotic fluid sampler for obstetrical medical treatment, a serial communication port, including cylinder (1), cylinder (1) one end is provided with connector (2), the other end sets up for the opening, demountable installation has syringe needle (3) on connector (2) syringe (1) internal seal slides and is provided with push rod (4), makes form sample space between cylinder (1), syringe needle (3) and push rod (4), syringe needle (3) include needle cover (31) and nook closing member (32), needle cover (31) and nook closing member (32) coaxial seal rotate the connection, needle cover (31) and the puncture end of nook closing member (32) are provided with bevel connection (33) that the shape is unanimous set up runner (34) in nook closing member (32), runner (34) one end with connector (2) intercommunication, the other end runs through the outer wall of nook closing member (32), when the two bevel mouths (33) are overlapped, the flow passage (34) is in a sealing state, and when the two bevel mouths (33) are dislocated, the flow passage (34) is exposed.

2. The amniotic fluid sampler for obstetrical medical treatment according to claim 1, wherein a connecting cap (311) is arranged at the end of the needle sheath (31), and the connecting cap (311) is inserted into the connector (2).

3. The amniotic fluid sampler for obstetrical medical treatment according to claim 2, wherein the connector (2) is provided with a plurality of limiting keys on the outer circumferential surface, and the inner wall of the connecting cap (311) is provided with a plurality of key slots adapted to the limiting keys.

4. The amniotic fluid sampler for obstetrical medical treatment according to claim 1, wherein a sealing ring (321) is arranged at the end of the needle core (32), the sealing ring (321) is provided with a sealing groove with the same size as the connector (2), and the connector (2) abuts against the sealing groove.

5. The amniotic fluid sampler for obstetrical medical treatment according to claim 1, characterized in that a liquid discharge port (12) is opened on one side of the needle cylinder (1) close to the connector (2), a collar (13) is rotatably sleeved on the needle cylinder (1), the collar (13) is fixedly connected with the needle core (32) through a plurality of connecting rods, the collar (13) covers the liquid discharge port (12), a liquid discharge conduit (14) is connected to the collar (13), and when the collar (13) is rotated to enable the liquid discharge conduit (14) to be coincident and communicated with the liquid discharge port (12), the flow channel (34) is in a closed state, and when the flow channel (34) is opened, the liquid discharge conduit (14) and the liquid discharge port (12) are sealed in a staggered manner.

6. The amniotic fluid sampler for obstetrical medical treatment according to claim 1, wherein the push rod (4) comprises a piston (41), a pressing sheet (42) and two connecting plates (43) which are arranged perpendicularly and crosswise, the piston (41) is arranged in the syringe (1) in a sealing and sliding manner, and the pressing sheet (42) is fixedly connected with the piston (41) through the connecting plates (43).

7. The amniotic fluid sampler for obstetrical medical treatment according to claim 6, further comprising a reversing limiting mechanism disposed on the cylinder (1), wherein the reversing limiting mechanism comprises four sliding columns (5) which are slidably disposed on the cylinder (1) in the radial direction, a limiting structure for unidirectionally limiting the movement of the push rod (4) is disposed between the sliding columns (5) and the connecting plate (43), and a control structure for controlling the radial movement of the sliding columns (5) is disposed between the sliding columns (5) and the collar (13).

8. The amniotic fluid sampler for obstetrical medical treatment according to claim 7, wherein the limiting structure comprises a wedge block (51) slidably arranged at the end of the sliding column (5), a spring (52) is arranged between the wedge block (51) and the sliding column (5), the adjacent wedge blocks (51) on the sliding column (5) are oppositely arranged, a triangular groove (53) matched with the corresponding wedge block (51) is formed in the edge of the connecting plate (43), and after the wedge block (51) extends into the triangular groove (53), the push rod (4) can only move in one direction along the inclined direction of the wedge block (51).

9. The amniotic fluid sampler for obstetrical medical treatment according to claim 7, wherein the control structure comprises a plurality of clamping rings (54) fixedly arranged at the end of the sliding column (5) and arranged in a C shape, the clamping rings (54) are movably connected with the same elliptical ring (6), and the lantern ring (13) and the elliptical ring (6) are fixedly connected through a plurality of connecting rods.

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