CN210811255U

CN210811255U - Fistula hole plugging device

Info

Publication number: CN210811255U
Application number: CN201921056908.9U
Authority: CN
Inventors: 陈天鸣; 陈仕林; 任琦蓉
Original assignee: Jiangsu Cancer Hospital
Current assignee: Jiangsu Cancer Hospital
Priority date: 2019-07-08
Filing date: 2019-07-08
Publication date: 2020-06-23
Anticipated expiration: 2029-07-08

Abstract

The utility model provides a fistula stopper, which comprises a stopper bracket and a blocking film; the occluder bracket comprises a central telescopic structure, a radial expansion structure and umbrella-shaped structures at two ends; the plugging film is coated on the umbrella-shaped structures at the two ends of the plugging device bracket; the central telescopic structure comprises a plug bolt, an outer sleeve and an inner inserting pipe; the radial expansion structure comprises two central circular rings, an elastic supporting structure and each axial support rod; the umbrella-shaped structure is formed by distributing all the U-shaped rods in a circumferential manner. The fistula orificium occluder can realize the size self-adaptive adjustment of the occluder bracket by utilizing a radial expansion structure, and can expand according to the size of a fistula orifice after being installed, so that the fistula orifice is blocked more tightly; the umbrella-shaped structures at the two ends are controlled to be unfolded or retracted by utilizing the relative stretching of the outer sleeve and the inner inserting tube, the umbrella-shaped structures can be in a shuttle shape before the insertion, the insertion at the fistula is convenient to smoothly, the two ends are unfolded in an umbrella shape after deformation, and the protection of the umbrella-shaped structures at the two ends at the fistula is realized.

Description

Fistula hole plugging device

Technical Field

The utility model relates to a medical appliance, in particular to a fistula plugging device.

Background

At present, in the treatment process of fistula of various organs, conservative treatment is preferred, such as comprehensive treatment through anti-infection, digestive juice secretion inhibition, internal and external drainage and decompression in the chest and abdominal cavity or through various natural orifices, nutrition enhancement, tissue repair promotion, granulation growth and the like, and self-healing is expected, the period is long, and patients are very painful. Some fistula holes are repaired by secondary operations, but the operation difficulty is high, the risk is high, the success rate is low, and the repaired fistula holes still have the risk of bleeding and re-fistula.

In more common fistula orifices, such as esophago-bronchial fistula, esophagogastric anastomotic fistula, residual gastric fistula, gastrointestinal anastomotic fistula, various intestinal fistulas, vesical vaginal fistula and rectovaginal fistula, fistula blocking is an important measure, so that the fistula orifice is temporarily closed, continuity of digestive tracts, respiratory tracts, urinary tracts and the like is recovered, the content does not overflow any more, and the corrosion of the content to surrounding tissues and the loss of body fluid and fatal complications such as infection, heavy bleeding and the like caused by the content are reduced. After the fistula is blocked, a relatively clean growth environment is created, the growth and healing of tissues at the fistula are facilitated, the treatment time is effectively shortened, and the normal functions of the digestive tract, the respiratory tract, the urinary tract and the like can be quickly restored. The common fistula plugging methods at present are: for small fissured fistulas, various medical glue and plugging means such as clamping closure and the like are applied through the intervention ways such as a gastrointestinal endoscope, a bronchoscope or a cystoscope and the like, and some can be successful; for larger defects of the fistula of the hollow viscera, after infection and inflammation are effectively controlled, the fistula is sutured, clamped or placed on a bracket by adopting an operation or an intervention way such as a gastrointestinal endoscope, a bronchoscope or a cystoscope, but the treatment effect is not exact after the fistula is blocked, and the fistula is easily subjected to a plurality of interference factors, so that complications such as infection, bleeding, local necrosis, expansion of the fistula and the like around the fistula are easily caused; after difficult plugging or failure of plugging, only one stage of operation fistulization and drainage can be selected, and then two stages of stoma repair and anastomosis are carried out, so that the treatment time is long, the pain of a patient is caused, and complications such as stoma stenosis, bleeding and infection and the like and the risk of repaired stoma reemplification are difficult to avoid during and after the operation. The appearance of the occluder enables a plurality of patients with congenital heart diseases such as atrioventricular defect, main pulmonary fistula and the like to obtain a very good curative effect, avoids huge damage of cardiac surgery, and the improved occluder is also applied to treatment of hollow organ fistula with infection and corrosion states at present, but the existing occluder only performs fistula orifice occlusion, so that two sides of a fistula orifice are isolated, but leaked or slowly leaked liquid cannot be discharged, further infection or corrosion is easily caused, and in addition, the occluders cannot perform self-adaptive size adjustment according to field occlusion requirements, and the universality is poor. Therefore, there is a need for a fistula plugging device, which has a certain size expansion performance, satisfies the self-adaptive size adjustment, and can conveniently suck out leaked liquid, so as to keep the fistula clean and sanitary and avoid further infection.

Disclosure of Invention

The utility model aims to provide a: the utility model provides a fistula stopper can have certain big or small expansibility, satisfies the self-adaptation size and adjusts, and can be convenient for extract the liquid that leaks, keeps the sanitation and hygiene of fistula to avoid causing further infection.

In order to realize the aim of the utility model, the utility model provides a fistula stopper, which comprises a stopper bracket and a stopper film; the occluder bracket comprises a central telescopic structure, a radial expansion structure and umbrella-shaped structures at two ends; the plugging film is coated on the umbrella-shaped structures at the two ends of the plugging device bracket;

the central telescopic structure comprises a plug bolt, an outer sleeve and an inner inserting pipe; the right end of the inner insertion tube is inserted in the outer sleeve, and a locking sliding groove is arranged on the outer wall of the inner insertion tube; the inner wall of the outer sleeve is provided with a guide block which is embedded into the locking sliding groove in a sliding manner; a membrane mounting round hole is formed in the left end pipe orifice of the inner insertion pipe by the plugging membrane; the end part of a screw rod of the plug bolt penetrates through the membrane mounting round hole and then is screwed on the left end of the inner inserting tube, and a liquid pumping hole is axially formed in the end head of the plug; the head of the plug bolt presses the hole edge of the membrane mounting circular hole on the left end pipe orifice of the inner insertion pipe; a channel plugging structure is arranged in the inner cannula;

the radial expansion structure comprises two central circular rings, an elastic supporting structure arranged on the circumference of the central circular rings and each axial supporting rod; the two central circular rings are respectively sleeved on the outer sleeve and the inner inserting pipe; each axial stay bar is distributed on the periphery of the central ring through an elastic supporting structure and is parallel to the axial direction of the inner inserting tube;

the umbrella-shaped structure is formed by distributing all the U-shaped rods in a circumferential manner, one end of each U-shaped rod is fixedly arranged on the central telescopic structure, and the other end of each U-shaped rod is fixedly arranged on the radial expansion structure; when the central telescopic structure is changed in a telescopic way, the umbrella-shaped structure can be unfolded and retracted.

Furthermore, the locking chute consists of an axial chute, an oblique chute and a surrounding chute which are sequentially communicated; the axial sliding groove is parallel to the axial direction of the inner inserting tube; the surrounding sliding groove is arranged around the circumferential outer wall of the inner inserting pipe and is positioned in the outer sleeve; one end of the surrounding sliding groove is flush with the axial extension line of the axial sliding groove, and the other end of the surrounding sliding groove is communicated with the axial sliding groove through the oblique sliding groove.

Furthermore, the elastic supporting structure is composed of each rhombic supporting frame and each V-shaped supporting frame; an acute angle of each rhombic supporting frame is fixedly arranged on the outer circumference of the central ring, and the tip end of each V-shaped supporting frame is fixedly arranged on the other acute angle of each rhombic supporting frame; the axial stay bars are fixedly arranged on the two adjacent ends of the two adjacent V-shaped support frames.

Furthermore, in each U-shaped rod positioned on the left side of the occluder bracket, one end of each U-shaped rod is installed on the left end of the axial stay bar in a butt joint mode through a connecting section, and the other end of each U-shaped rod is installed on the circumferential edge of the left pipe orifice of the inner insertion pipe through the connecting section; in each U-shaped rod positioned on the right side of the occluder bracket, one end of each U-shaped rod is installed on the right end of the axial stay bar in a butt joint mode through a connecting section, and the other end of each U-shaped rod is installed on the circumferential edge of the right pipe orifice of the outer sleeve pipe through the connecting section; the cross-section of linkage segment and U-shaped pole is flat rectangle, and the thickness of linkage segment is less than the tip thickness of U-shaped pole, and the thickness of the U-shaped bending department of U-shaped pole is less than the tip thickness of U-shaped pole.

Furthermore, the channel plugging structure comprises a plugging disc and four arc-shaped supporting bars arranged at the circumferential edge of the plugging disc; a circle of limiting retainer ring is arranged on the inner wall of the inner insertion pipe; the plugging disc is arranged in the inner inserting tube through four arc-shaped supporting bars and is positioned on the left side of the limiting retainer ring; the four arc-shaped supporting bars elastically press the plugging disc to cling to the left side edge of the limiting retainer ring to realize plugging.

Furthermore, a circle of second limiting ring groove is arranged on the inner wall of the right-end pipe orifice of the inner insertion pipe; a second notch communicated with the second limiting ring groove is formed in the end surface of the right pipe orifice of the inner insertion pipe; an inner pipe limiting convex ring is arranged at the right end pipe orifice of the outer sleeve, and a circle of first limiting ring groove is arranged on the inner ring surface of the inner pipe limiting convex ring; and a first notch communicated with the first limiting ring groove is arranged on the end surface of the right pipe orifice of the outer sleeve.

The beneficial effects of the utility model reside in that: the size of the occluder support can be adjusted in a self-adaptive mode by utilizing the radial expansion structure, and the occluder support can expand according to the size of the fistula after being installed, so that the fistula can be occluded tightly; the umbrella-shaped structures at two ends are controlled to be unfolded or retracted by utilizing the relative expansion of the outer sleeve and the inner inserting tube, the umbrella-shaped structures can be in a shuttle shape before insertion, the smooth insertion at the fistula is facilitated, the umbrella-shaped structures at two ends are unfolded after deformation, and the protection of the umbrella-shaped structures at two ends at the fistula is realized; the locking chute is matched with the guide block, so that the inner cannula and the outer cannula can be locked after being relatively extended out, and the umbrella-shaped structures at the two ends are kept in an opening state; utilize passageway block structure can realize the inside switch on and the closed control of interior intubate, be convenient for go out the leakage liquid suction of fistula, keep the sanitation and hygiene of fistula to avoid causing further infection.

Drawings

Fig. 1 is a schematic structural view of the occluder bracket of the present invention in the occluding state;

fig. 2 is a schematic structural view of the occluder bracket of the present invention in an initial state;

fig. 3 is a schematic structural view of the occluder bracket of the present invention in an inserted state;

fig. 4 is a schematic sectional structure view of the occluder bracket of the present invention at the central ring;

fig. 5 is a schematic design structure diagram of the first notch and the second notch of the occluder bracket of the present invention;

fig. 6 is a schematic structural diagram of the plugging device bracket of the present invention inserted into a conveyor.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in fig. 1-6, the utility model discloses a fistula plugging device includes: an occluder bracket and an occluding membrane; the occluder bracket comprises a central telescopic structure, a radial expansion structure and umbrella-shaped structures at two ends; the plugging film is coated on the umbrella-shaped structures at the two ends of the plugging device bracket;

the central telescopic structure comprises a plug bolt 40, an outer sleeve 1 and an inner inserting tube 2; the right end of the inner insertion tube 2 is inserted into the outer sleeve 1, and a locking sliding groove is arranged on the outer wall of the inner insertion tube 2; the inner wall of the outer sleeve 1 is provided with a guide block 9 which is embedded into the locking sliding groove in a sliding manner; the left end pipe orifice of the inner insertion pipe 2 is provided with a circular membrane mounting hole by the plugging membrane; the end part of the screw rod of the plug bolt 40 penetrates through the membrane mounting round hole and then is installed on the left end of the inner inserting tube 2 in a threaded manner, and a liquid pumping hole is formed in the plug end head 40 in the axial direction; the head of the plug bolt 40 presses the hole edge of the membrane mounting circular hole on the left end pipe orifice of the inner insertion pipe 2; a channel plugging structure is arranged in the inner cannula 2;

the radial expansion structure comprises two central rings 35, elastic support structures arranged on the circumferences of the central rings 35 and each axial strut 3; the two central rings 35 are respectively sleeved on the outer sleeve 1 and the inner inserting tube 2; each axial stay bar 3 is distributed on the periphery of the central ring 35 through an elastic supporting structure, and the axial stay bars 3 are parallel to the axial direction of the inner inserting tube 2;

the umbrella-shaped structure is formed by distributing all the U-shaped rods 5 in a circumferential manner, one end of each U-shaped rod 5 is fixedly arranged on the central telescopic structure, and the other end of each U-shaped rod 5 is fixedly arranged on the radial expansion structure; when the central telescopic structure is changed in a telescopic way, the umbrella-shaped structure can be unfolded and retracted.

The size of the occluder support can be adjusted in a self-adaptive mode by utilizing the radial expansion structure, and the occluder support can expand according to the size of the fistula after being installed, so that the fistula can be occluded tightly; the umbrella-shaped structures at two ends are controlled to be unfolded or retracted by utilizing the relative expansion of the outer sleeve 1 and the inner insertion tube 2, the umbrella-shaped structures can be contracted into a shuttle shape before insertion, the insertion at the fistula is convenient, the umbrella-shaped structures at two ends are unfolded after deformation, and the protection of the umbrella-shaped structures at two ends at the fistula is realized; the locking can be carried out after the inner cannula 2 and the outer cannula 1 relatively extend out by utilizing the matching of the locking sliding chute and the guide block 9, so that the umbrella-shaped structures at the two ends are kept in an opening state; utilize passageway block structure can realize interior intubate 2 inside switch on and closed control, be convenient for come out the leakage liquid suction of fistula, keep the clean health of fistula and avoid causing further infection.

Furthermore, the locking chute is composed of an axial chute 6, an oblique chute 7 and a surrounding chute 8 which are sequentially communicated; the axial sliding groove 6 is parallel to the axial direction of the inner inserting tube 2; the surrounding sliding groove 8 is arranged around the circumferential outer wall of the inner inserting tube 2, and the surrounding sliding groove 8 is positioned in the outer sleeve 1; one end of the surrounding sliding groove 8 is flush with the axial extension line of the axial sliding groove 6, and the other end of the surrounding sliding groove is communicated with the axial sliding groove 6 through the oblique sliding groove 7. The axial chute 6 is utilized to ensure that the inner insertion tube 2 can be axially inserted into the outer sleeve 1 in an initial state, so that umbrella-shaped structures at two ends are contracted into a fusiform shape before being inserted, and the smooth insertion at a fistula is facilitated; when the outer sleeve 1 can be relatively pulled out from the inner insertion tube 2 by utilizing the oblique sliding groove 7, the inner insertion tube 2 and the outer sleeve 1 can relatively rotate, certain rotary resilience force is realized under the elastic deformation action of the U-shaped rod 5, and the guide block 9 moves to the position surrounding the sliding groove 8 and rapidly slides in, so that the relative locking of the inner insertion tube 2 and the outer sleeve 1 is realized, and the umbrella-shaped structures at two ends are kept in a spreading state after being installed.

Further, the elastic supporting structure is composed of each diamond-shaped supporting frame 17 and each V-shaped supporting frame 16; one acute angle of each rhombic supporting frame 17 is fixedly arranged on the outer circumference of the central ring 35, and the tip end part of each V-shaped supporting frame 16 is fixedly arranged on the other acute angle of each rhombic supporting frame 17; the axial stay bars 3 are fixedly arranged on two adjacent ends of two adjacent V-shaped support frames 16. The rhombic supporting frames 17 have certain elastic deformation performance, and the elastic deformation effect of the V-shaped supporting frames 16 is matched, so that the distribution circumference of each axial supporting rod 3 distributed around the central ring 35 can be adjusted, the size of the fistula pore can be adjusted in a self-adaptive mode, and the fistula pore has good universality.

Furthermore, in each U-shaped rod 5 positioned on the left side of the occluder bracket, one end of the U-shaped rod 5 is butt-jointed and installed on the left end of the axial stay bar 3 through the connecting section 4, and the other end of the U-shaped rod 5 is installed on the circumferential edge of the left tube opening of the inner insertion tube 2 through the connecting section 4; in each U-shaped rod 5 positioned on the right side of the occluder bracket, one end of the U-shaped rod 5 is in butt joint with the right end of the axial stay bar 3 through a connecting section 4, and the other end of the U-shaped rod 5 is arranged on the circumferential edge of the right pipe orifice of the outer sleeve 1 through the connecting section 4; the cross sections of the connecting section 4 and the U-shaped rod 5 are flat rectangles, the thickness of the connecting section 4 is smaller than that of the end part of the U-shaped rod 5, and the thickness of the U-shaped bent part of the U-shaped rod 5 is smaller than that of the end part of the U-shaped rod 5. The two ends of the U-shaped rod 5 are fixedly installed by utilizing the connecting section 4 with smaller thickness, so that bending can be preferentially generated at the connecting section 4 during deformation, the requirement on the deformation of the U-shaped rod 5 is low, and the umbrella-shaped structure is ensured to be tidier and better after being unfolded; utilize the cross-section to be the linkage segment 4 and the U-shaped pole 5 of flat rectangle can be easy inwards buckling when warping and be fusiformis or outwards buckle and be umbelliform, and be difficult to appear the swing and make including intubate 2 and outer tube 1 relative rotation after have stronger bounce-back gyroscopic force, ensure guide block 9 locks in encircleing spout 8, keep the state of strutting of the umbelliform structure at both ends.

Further, the channel blocking structure comprises a blocking disk 36 and four arc-shaped supporting bars 37 arranged at the circumferential edge of the blocking disk 36; a circle of limiting retainer ring 24 is arranged on the inner wall of the inner insertion pipe 2; the plugging disc 36 is arranged in the inner intubation 2 through four arc-shaped supporting bars 37, and the plugging disc 36 is positioned at the left side of the limit retainer ring 24; four arc-shaped supporting bars 37 elastically press the plugging disc 36 to cling to the left side edge of the limiting retainer ring 24 to realize plugging. The inner cannula 2 can be blocked by the blocking disc 36, when the inner push rod 20 of the bracket conveyor is pushed, the four arc-shaped supporting bars 37 are bent, and a gap is formed between the blocking disc 36 and the limiting retainer ring 24, so that the conduction of a liquid pumping channel is realized; after the inner push rod 20 of the support conveyor is released, the blocking disc 36 is tightly attached to the left side edge of the limiting retainer ring 24 under the elastic pressing action of the four arc-shaped supporting bars 37 to realize blocking again.

Further, a circle of second limiting ring groove 11 is arranged on the inner wall of the right-end pipe orifice of the inner insertion pipe 2; a second gap 15 communicated with the second limiting ring groove 11 is arranged on the end surface of the right pipe orifice of the inner inserting pipe 2; an inner pipe limiting convex ring 12 is arranged at the right end pipe orifice of the outer sleeve 1, and a circle of first limiting ring groove 13 is arranged on the inner ring surface of the inner pipe limiting convex ring 12; a first gap 14 communicated with the first limit ring groove 13 is arranged on the end surface of the right pipe orifice of the outer sleeve 1. By utilizing the matching of the second limiting convex block 22 arranged on the pushing pipe 19 of the support conveyor and the second limiting ring groove 11 and the matching of the first limiting convex block 21 arranged on the inserting pipe 18 of the support conveyor and the first limiting ring groove 13, the axial movement of the inserting pipe 18 and the pushing pipe 19 can be realized to control the axial movement driving of the inner inserting pipe 2 and the outer sleeve 1, thereby realizing the deformation driving of a shuttle-shaped structure and an umbrella-shaped structure; the first notch 14 and the second notch 15 facilitate the second limiting lug 22 to enter the first limiting ring groove 13 and the second limiting ring groove 11.

The utility model discloses an among the fistula stopper, stopper support overall structure is made by degradable material, for example poly levorotatory polylactic acid (PLLA), poly levorotatory polylactic acid (PLLA) is a degradable macromolecular material, it is the degradable material that food and drug administration approved can be applied to implanting the human body, after degradable stopper support implantation human body fills the vacancy, human tissue can slowly grow along stopper support, about 2-3 years, human self tissue has grown very firmly, stopper support has degraded to lactic acid this moment, by human digestion absorption, generate water and carbon dioxide discharge outside, do not leave any vestige; the plugging membrane is also made of biodegradable materials, but the degradation cycle of the plugging membrane is longer than that of the plugging device bracket, so that the barrier membrane can be degraded after the fistula orifice grows.

When the fistula stopper is used, firstly, the umbrella-shaped structures at the two ends of the stopper bracket are covered with the elastic plugging films, the threads of the plug bolt 40 are screwed and installed on the left end of the inner insertion tube 2, and the hole edge of the film installation round hole is pressed on the left end pipe orifice of the inner insertion tube 2, so that a complete plugging structure is formed; then the insertion tube 18 and the pushing tube 19 of the matched bracket conveyor are correspondingly inserted into the outer sleeve 1 and the inner insertion tube 2 respectively, so that the first limiting bump 21 enters the first limiting ring groove 13 from the first notch 14, and the second limiting bump 22 enters the second limiting ring groove 11 from the second notch 15; then the pushing tube 19 pulls the inner inserting tube 2 to retract into the outer sleeve 1, thereby pulling each U-shaped rod 5 with umbrella-shaped structures at two ends to draw close to the middle to form a fusiform structure which is convenient to insert into the fistula, and then the fusiform structure is inserted into the fistula to be blocked; then the pushing tube 19 pushes the inner inserting tube 2 to extend outwards from the outer sleeve 1, so that each U-shaped rod 5 at two ends is pushed to be turned outwards to form an umbrella-shaped structure, and the umbrella-shaped structure is pressed on the side surfaces at two ends of the fistula hole to meet the plugging requirement; pressing the inner push rod 20 to extend out of the push tube 19 rightwards, pushing the plugging disc 36 by using the left end part of the inner push rod 20 to conduct the inside of the inner cannula 2, so that a liquid pumping channel is formed by the liquid pumping hole, the inner cannula 2 and the push tube 19, leakage liquid is pumped out, and liquid medicines such as growth factors and the like can be pushed to the inside through the liquid pumping channel to promote rapid recovery of growth at the fistula; finally, the inserting tube 18 is rotated, so that the first limiting lug 21 is separated from the first limiting ring groove 13 through the first notch 14, meanwhile, the second limiting lug 22 is separated from the second limiting ring groove 11 through the second notch 15, the inserting tube 18 is pulled out, the pushing tube 19 is pushed, and the accurate positioning and installation of the plugging device support are completed; after the insertion tube 18 and the push tube 19 are pulled out, the blocking disc 36 blocks the liquid extraction channel again under the elastic supporting action of the four arc-shaped supporting strips 37, and finally the blocking membrane at the insertion position is fastened and closed.

As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A fistula stopper, its characterized in that: comprises an occluder bracket and an occluding membrane; the occluder bracket comprises a central telescopic structure, a radial expansion structure and umbrella-shaped structures at two ends; the plugging film is coated on the umbrella-shaped structures at the two ends of the plugging device bracket;

the central telescopic structure comprises a plug bolt (40), an outer sleeve (1) and an inner inserting pipe (2); the right end of the inner insertion tube (2) is inserted into the outer sleeve (1), and a locking sliding groove is arranged on the outer wall of the inner insertion tube (2); a guide block (9) which is embedded into the locking sliding groove in a sliding manner is arranged on the inner wall of the outer sleeve (1); the left end pipe orifice of the inner insertion pipe (2) is provided with a circular membrane mounting hole by the plugging membrane; the end part of a screw rod of the plug bolt (40) penetrates through the membrane mounting round hole and then is screwed and mounted on the left end of the inner inserting pipe (2), and a liquid pumping hole is formed in the plug bolt (40) along the axial direction; the head of the plug bolt (40) presses the hole edge of the membrane mounting circular hole on the left end pipe orifice of the inner insertion pipe (2); a channel plugging structure is arranged in the inner inserting pipe (2);

the radial expansion structure comprises two central circular rings (35), an elastic supporting structure arranged on the circumference of the central circular rings (35) and each axial support rod (3); the two central circular rings (35) are respectively sleeved on the outer sleeve (1) and the inner inserting tube (2); each axial stay bar (3) is distributed on the periphery of the central ring (35) through an elastic supporting structure, and the axial stay bars (3) are parallel to the axial direction of the inner inserting tube (2);

the umbrella-shaped structure is formed by distributing all the U-shaped rods (5) in a circumferential manner, one end of each U-shaped rod (5) is fixedly arranged on the central telescopic structure, and the other end of each U-shaped rod is fixedly arranged on the radial expansion structure; when the central telescopic structure is changed in a telescopic way, the umbrella-shaped structure can be unfolded and retracted.

2. The fistula occluder of claim 1, wherein: the locking chute consists of an axial chute (6), an oblique chute (7) and a surrounding chute (8) which are sequentially communicated; the axial sliding chute (6) is parallel to the axial direction of the inner inserting tube (2); the surrounding sliding groove (8) is arranged around the circumferential outer wall of the inner inserting pipe (2), and the surrounding sliding groove (8) is positioned in the outer sleeve (1); one end of the surrounding sliding groove (8) is flush with the axial extension line of the axial sliding groove (6), and the other end of the surrounding sliding groove is communicated with the axial sliding groove (6) through the oblique sliding groove (7).

3. The fistula occluder of claim 1, wherein: the elastic supporting structure is composed of diamond supporting frames (17) and V-shaped supporting frames (16); one acute angle of each rhombic supporting frame (17) is fixedly arranged on the outer circumference of the central ring (35), and the tip end part of each V-shaped supporting frame (16) is fixedly arranged on the other acute angle of each rhombic supporting frame (17); the axial stay bars (3) are fixedly arranged on two adjacent ends of two adjacent V-shaped support frames (16).

4. The fistula occluder of claim 1, wherein: in each U-shaped rod (5) positioned on the left side of the occluder bracket, one end of each U-shaped rod (5) is installed on the left end of the axial stay bar (3) in a butt joint mode through the connecting section (4), and the other end of each U-shaped rod (5) is installed on the circumferential edge of the left pipe orifice of the inner insertion pipe (2) through the connecting section (4); in each U-shaped rod (5) positioned on the right side of the occluder bracket, one end of each U-shaped rod (5) is installed on the right end of the axial stay bar (3) in a butt joint mode through the connecting section (4), and the other end of each U-shaped rod (5) is installed on the circumferential edge of the right pipe orifice of the outer sleeve (1) through the connecting section (4); the cross sections of the connecting section (4) and the U-shaped rod (5) are flat rectangles, the thickness of the connecting section (4) is smaller than that of the end part of the U-shaped rod (5), and the thickness of the U-shaped bent part of the U-shaped rod (5) is smaller than that of the end part of the U-shaped rod (5).

5. The fistula occluder of claim 1, wherein: the channel blocking structure comprises a blocking disc (36) and four arc-shaped supporting bars (37) arranged at the circumferential edge of the blocking disc (36); a circle of limiting retainer ring (24) is arranged on the inner wall of the inner insertion pipe (2); the plugging disc (36) is arranged in the inner inserting tube (2) through four arc-shaped supporting bars (37), and the plugging disc (36) is positioned on the left side of the limiting retainer ring (24); the four arc-shaped supporting bars (37) elastically press the plugging disc (36) to cling to the left side edge of the limiting retainer ring (24) to realize plugging.

6. The fistula occluder of claim 5, wherein: a circle of second limiting ring groove (11) is arranged on the inner wall of the right-end pipe orifice of the inner insertion pipe (2); a second gap (15) communicated with the second limiting ring groove (11) is arranged on the end surface of the right pipe orifice of the inner insertion pipe (2); an inner pipe limiting convex ring (12) is arranged at the right end pipe orifice of the outer sleeve (1), and a circle of first limiting ring groove (13) is arranged on the inner ring surface of the inner pipe limiting convex ring (12); a first gap (14) communicated with the first limit ring groove (13) is arranged on the end surface of the right pipe orifice of the outer sleeve (1).