A hemostatic clip

Abstract

The present invention discloses a hemostatic clip, comprising a fixing frame, two clips and a ball head pull rod, wherein the two clips are relatively arranged at the front end of the fixing frame, and the ball head pull rod is used to drive the two clips to open and close; the characteristics include: further comprising a plastic sleeve and a steel sleeve arranged at the lower part of the inner cavity of the fixing frame, wherein the plastic sleeve is arranged between the steel sleeve and the inner wall of the fixing frame; the ball head pull rod passes through the steel sleeve; after the ball head pull rod is separated from the clip, the ball head drives the steel sleeve to slide out of the plastic sleeve by pulling the ball head pull rod backward. The hemostatic clip provided by the present invention realizes the opening and closing of the two clips through the ball head pull rod, and realizes the separation of the clamping part at the front end of the hemostatic clip and the control part at the rear end through the cooperation of the ball head pull rod, the plastic sleeve and the steel sleeve, and has the advantages of simple structure, easy operation and high operational stability, and is a hemostatic clip suitable for wide use.

Description

Technical Field

[0001] The invention relates to a hemostatic clip, in particular to a hemostatic clip pulled by a ball head pull rod, and belongs to the field of medical devices. Background Art

[0002] Endoscopic metal clip hemostasis is one of the most widely used hemostatic methods. Skilled metal clip operation in appropriate cases can effectively stop bleeding and prevent rebleeding, reduce adverse reactions, and greatly improve the safety and cure rate of endoscopic treatment of gastrointestinal bleeding. The hemostatic mechanism of metal hemostatic clips is the same as surgical vascular ligation or suture. It is a physical and mechanical method that uses the mechanical force generated when the hemostatic clip is closed to ligate the surrounding tissues and bleeding blood vessels, thereby closing the bleeding blood vessels to block blood flow and achieve hemostasis. It is suitable for hemostatic treatment of non-varicose active bleeding and visible vascular stump lesions.

[0003] Existing hemostatic clips have the disadvantage of being difficult to operate. The hemostatic clips cannot be operated experimentally. Once closed, they cannot be opened again. If there is an operational error, some hemostatic clips will be directly discarded. Therefore, it is necessary to provide a hemostatic clip that can be repeatedly opened and closed before clamping the tissue and can be locked after clamping the tissue.

[0004] In addition, the existing hemostatic clips mostly use a three-claw clip to separate the hemostatic clip from the control part, which causes problems such as difficulty in separation during use. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a novel hemostatic clip.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A hemostatic clip comprises a fixing frame, two clips and a ball head pull rod, wherein the two clips are arranged oppositely at the front end of the fixing frame, and the ball head pull rod is used to drive the two clips to open and close;

[0008] It also includes a plastic sleeve and a steel sleeve disposed at the lower part of the inner cavity of the fixing frame, wherein the plastic sleeve is disposed between the steel sleeve and the inner wall of the fixing frame;

[0009] The ball head pull rod passes through the steel sleeve;

[0010] After the ball head pull rod is separated from the clip, the ball head pull rod is pulled backwards, so that the ball head drives the steel sleeve to slide out of the plastic sleeve.

[0011] Preferably, the inner surface of the plastic sleeve is an inclined conical surface, and the inner diameter of the top of the plastic sleeve is larger than the inner diameter of the bottom of the plastic sleeve;

[0012] The dimensions of the inner surface of the plastic sleeve match the dimensions of the outer surface of the portion of the steel sleeve that mates with it.

[0013] Preferably, the steel sleeve is divided into two parts, the upper part is used to match the plastic sleeve, and the lower part is used to connect the spring tube.

[0014] Preferably, the outer surface of the upper part of the steel sleeve and the inner surface of the plastic sleeve are interference fit.

[0015] Preferably, a plurality of holes are arranged on the circumference of the fixing frame, and glue is injected into the fixing frame through the holes so that the plastic sleeve and the fixing frame are bonded together.

[0016] Preferably, the ball head pull rod includes a pull rod and a ball head arranged at the front end of the pull rod, the diameter of the ball head is larger than the diameter of the pull rod, and the diameter of the ball head is larger than the inner diameter of the steel casing; the diameter of the pull rod is equal to the inner diameter of the steel casing.

[0017] Preferably, the ball head pull rod further includes a connecting tube, the top of the connecting tube is connected to the pull rod, and the bottom of the connecting tube is used to connect to the cable.

[0018] The hemostatic clip provided by the present invention realizes the opening and closing of two clips through a ball head pull rod, and realizes the separation of the front end clamping part and the rear end control part through the cooperation of the ball head pull rod, a plastic sleeve and a steel sleeve. It has the advantages of simple structure, easy operation and high operational stability, and is a hemostatic clip suitable for wide use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the hemostatic clip provided by the present invention;

[0020] Figure 2 yes Figure 1 A schematic cross-sectional view of the hemostatic clip shown;

[0021] Figure 3 It is a schematic diagram of the structure of the clip in the hemostatic clip;

[0022] Figure 4 It is a schematic diagram of the structure of the fixing frame in the hemostatic clip;

[0023] Figure 4A yes Figure 4 A schematic cross-sectional view of the fixing frame shown;

[0024] Figure 5 It is a schematic diagram of the structure of the ball head pull rod in the hemostatic clip;

[0025] Figure 6It is a schematic diagram of the structure of the plastic sleeve in the hemostatic clip;

[0026] Figure 7 It is a schematic diagram of the structure of the steel sleeve in the hemostatic clip;

[0027] Figure 8 yes Figure 1 A schematic diagram of the closed state of the hemostatic clip shown;

[0028] Fig. 9 yes Figure 8 A schematic cross-sectional view of the hemostatic clip shown;

[0029] Fig.10 yes Figure 1 Schematic diagram of the detached state of the hemostatic clip shown. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, the clamping part used to clamp the blood vessel is the front end, and the control part of the hemostatic clip for doctors to operate is the back end.

[0031] like Figure 1 and Figure 2 As shown, the hemostatic clip provided by the present invention includes two clips 1, a fixing frame 2, a ball head pull rod 4, a plastic sleeve 5 and a steel sleeve 6.

[0032] Among them, two clips 1 are arranged at the front end of the fixing frame 2 through a fixing pin 3, and the two clips 1 are arranged opposite to each other. The fixing pin 3 passes through the slide groove 13 set in the middle of the two clips 1 and restricts the two clips 1 between the two brackets at the front end of the fixing frame 2. The fixing pin 3 can slide along the slide groove 13, and the two clips 1 can rotate around the fixing pin 3. A hemispherical shell-shaped connection part 18 (also called a ball head bowl) is respectively arranged at the rear end of the two clips 2. The ball head pull rod 4 includes a pull rod 41 and a ball head 40 set at the front end of the pull rod 41. The ball head 40 of the ball head pull rod 4 is restricted inside two hemispherical shell-shaped connection parts 18 arranged opposite to each other. The ball head pull rod 4 is used to drive the two clips 1 to open and close. As the ball head 40 reciprocates in the up and down directions, the rear ends of the two clips 1 are driven to reciprocate in the up and down directions. At the same time, under the action of the fixing pin 3, the two clips 1 are opened and closed. When the two clips 1 are closed, the ball head pull rod 4 is continuously pulled backwards, and the two closed clips 1 are stuck at the front end of the fixing frame 2. Then, the ball head pull rod 4 is continuously pulled backwards, and the ball head 40 moves backwards to deform the hemispherical shell type connection part 18, and the ball head 40 is separated from the hemispherical shell type connection part 18.

[0033] The fixing frame 2 includes a tube body 21 and two brackets 22 arranged at the front end of the tube body 21, wherein the tube body 21 includes a plurality of stepped cavities, the inner diameter of the upper cavity is smaller than the inner diameter of the lower cavity, the plastic sleeve 5 and the steel sleeve 6 are arranged in the area with the largest inner diameter at the lower part of the inner cavity of the fixing frame 2 (i.e., arranged in the lowermost cavity), and the plastic sleeve 5 is arranged between the steel sleeve 6 and the inner wall of the fixing frame 2. The ball head pull rod 4 passes through the steel sleeve 6. After the ball head pull rod 4 is separated from the clip 1, by pulling the ball head pull rod 4 backward, the ball head 40 drives the steel sleeve 6 to slide out of the plastic sleeve 5.

[0034] Specifically, if Figure 3 As shown, the front part of the clip 1 is an inwardly buckled claw 11, the middle part is an intermediate connecting body 12, and the rear end is provided with a hemispherical shell type connecting part 18. Among them, a sawtooth extending in the closing direction is formed at the front end of the claw 11 for clamping. A slide groove 13 is formed on the intermediate connecting body 12 of the clip 1. The slide groove 13 includes an inclined portion 14 and a bent portion 15. The distance between the inclined portion 14 and the outer wall of the clip 1 gradually decreases from the rear end to the front end of the clip 1, and the outer wall of the clip 1 refers to the side wall facing away from the closing direction of the clip 1. The bent portion 15 is arranged at one end of the slide groove 13 away from the hemispherical shell type connecting part 18, that is, at a position close to the front end of the clip 1, and the extension direction of the bent portion 15 is parallel to the length direction of the clip 1. When the fixing pin 3 slides from the inclined portion 14 of the slide groove 13 to the position of the bent portion 15, the two clips 1 are in a closed and locked position. The hemispherical shell connecting parts 18 of the two clips 1 have opening directions facing each other, which are used to limit the ball head 40 of the ball head tie rod 4 inside the two hemispherical shell connecting parts 18. The structure of the ball head tie rod 4 is as follows Figure 5 As shown, the ball head tie rod 4 includes a tie rod 41 and a ball head 40 arranged at the front end of the tie rod 41. A notch is formed on each hemispherical shell type connection part 18 for accommodating the connecting rod 41 of the ball head tie rod 4. By pulling the ball head tie rod 4, the ball head 40 moves backward to deform the hemispherical shell type connection part 18, and the ball head tie rod 4 is separated from the hemispherical shell type connection part 18.

[0035] In addition, an annular protrusion 19 is formed on the outer wall of the hemispherical shell type connection part 18, which is used to cooperate with the annular flange 20 provided at the front end of the tube body of the fixing frame 2; when the hemispherical shell type connection part 18 moves backward into the interior of the fixing frame 2, the protrusion 19 is stuck behind the annular flange 20 to achieve closed locking. In order to facilitate pulling the ball head tie rod 4, the protrusion 19 has an inclined transition surface.

[0036] like Figure 4 and Figure 4AAs shown, the fixing frame 2 includes a tube body 21 and two brackets 22 arranged at the front end of the tube body 21, and the two brackets 22 extend upward independently from the opposite sides of the tube body 21. Through holes 24 are respectively arranged at corresponding positions on the upper parts of the two brackets 22. The fixing pin shaft 3 passes through the slide groove 13 arranged in the middle of the two clips 1, and its two ends pass through the through holes 24 and are fixed, so that the two clips 1 are restricted between the two brackets 22 at the front end of the fixing frame 2. The clip 1 can open and close in the area between the two brackets 22.

[0037] Combination Figure 2 and Figure 4A As shown, a plurality of stepped cavities are formed in the tube body 21, wherein the inner diameter of the upper cavity is smaller than the inner diameter of the lower cavity. Since the inner diameter of the topmost cavity is smaller than the distance between the two brackets 22, an annular flange 20 is formed at the position where the topmost cavity and the bracket meet, and the annular flange 20 defines a narrow entrance of the tube body 21. Under the action of the ball head pull rod 4, the hemispherical shell connecting parts 18 of the two clips 1 enter the topmost cavity 26 through the above narrow entrance, so that the protrusions 19 arranged on the outer wall of the hemispherical shell connecting part 18 are stuck at the lower part of the annular flange 20, and the closed locking is achieved.

[0038] In the illustrated embodiment, two stepped areas with a smaller upper area and a larger lower area are formed below the topmost cavity inside the tube body 21, and the inner diameter of the upper first area 27 is smaller than the inner diameter of the lower second area 28. The plastic sleeve 5 and the steel sleeve 6 are stuck inside the second area 28. In addition, three holes 25 are formed on the circumference of the second area 28, and glue is injected into the tube body 21 of the fixing frame 2 through the holes 25, so as to achieve the bonding of the fixing frame 2 and the plastic sleeve 5.

[0039] The structure of the ball head tie rod 4 is as follows Figure 5 As shown, the ball head pull rod 4 includes a pull rod 41 and a ball head 40 arranged at the front end of the pull rod 41 , and the diameter of the ball head 40 is greater than the diameter of the pull rod 41 .

[0040] The ball head 40 is confined inside the hemispherical shell-shaped connection part 18 at the rear end of the two clips 1. The reciprocating motion of the ball head 40 forms the reciprocating motion of the clips 1. At the same time, under the action of the fixing pin 3, the two clips 1 are opened and closed. When the two clips 1 are closed, the ball head 40 continues to move backward so that the two clips 1 are stuck inside the fixing frame 2, and the hemispherical shell-shaped connection part 18 at the rear end of the two clips 1 is deformed, so that the ball head 40 and the hemispherical shell-shaped connection part 18 are separated.

[0041] The diameter of the pull rod 41 is equal to or slightly smaller than the inner diameter of the steel sleeve 6, so that the pull rod 41 can stably move up and down along the hole in the steel sleeve 6. The diameter of the ball head 40 is larger than the inner diameter of the steel sleeve 6, so that when the ball head 40 moves to the position of contact with the steel sleeve 6 and continues to move backward, the ball head 40 will drive the steel sleeve 6 to slide out of the plastic sleeve 5.

[0042] The ball head pull rod 4 also includes a connecting tube 43, the top of which is connected to the pull rod 41, and the bottom of which is used to connect to the cable. Specifically, the connection between the ball head pull rod 4 and the cable is achieved by inserting the lower end of the pull rod 41 into the connecting tube 43 and fixing it, and inserting the cable into the hole 44 at the bottom of the connecting tube 43 and fixing it.

[0043] The structure of the plastic sleeve 5 and the steel sleeve 6 is as follows: Figure 6 and 7 The outer diameter of the plastic sleeve 5 matches the inner diameter of the lowermost region (ie, the second region 28) of the fixing frame 2; the size of the inner surface of the plastic sleeve 5 matches the size of the outer surface of the portion of the steel sleeve 6 that cooperates with it.

[0044] like Figure 2 and Figure 6 As shown, the inner surface 50 of the plastic sleeve 5 is an inclined conical surface; the inner diameter of the top of the plastic sleeve 5 is greater than the inner diameter of the bottom of the plastic sleeve 5 .

[0045] like Figure 7 As shown, the steel sleeve 6 has two parts, the upper part 61 is used to match the plastic sleeve 5, and the lower part 62 is used to connect the spring tube. Specifically, the outer surface of the upper part 61 is a conical surface that matches the inner surface 50 of the plastic sleeve 5, and the outer surface of the upper part 61 can be interference fit with the inner surface of the plastic sleeve 5; the outer surface of the lower part 62 is a cylindrical surface, which can be inserted into the spring tube for fixing.

[0046] In the above structure, a plastic sleeve 5 and a steel sleeve 6 are arranged in the bottom cavity of the fixing frame 2, and the ball head pull rod 4 is pulled back to make the ball head 40 of the ball head pull rod 4 push the steel sleeve 6 to squeeze the plastic sleeve 5 to deform, so that the ball head pull rod 4 drives the steel sleeve 6 to slide out of the plastic sleeve 5, and the control part composed of the ball head pull rod 4, the steel sleeve 6, and the spring tube and control handle connected to the steel sleeve 6 are separated from the clamping part of the front end of the hemostatic clip. The clamping part remaining in the body, including the two clips 1, the fixing frame 2, the fixing pin 3 and the plastic sleeve 5, can be made of degradable materials.

[0047] The structure of the hemostatic clip provided by the present invention is introduced above. Figure 1 , 2 , 8, 9 and 10 describe in detail the assembly process and use process of the hemostatic clip.

[0048] When assembling the hemostatic clip, first, place the ball head 40 of the ball head pull rod 4 in the hemispherical shell-shaped connecting portion 18 of the two clips 1; put the fixing frame 2 on the two clips 1, and insert the fixing pin 3. Among them, a sheath cap can be put on the outside of the fixing pin 3 to prevent the fixing pin 3 from falling off. Then, put the plastic sleeve 5 and the steel sleeve 6 on the pull rod 41 of the ball head pull rod 4; and insert the plastic sleeve 5 into the base of the fixing frame 2. In order to enhance the connection strength between the fixing frame 2 and the plastic sleeve 5, glue is applied to the three circular holes 25 reserved in the fixing frame 2 to bond the plastic sleeve 5 to the fixing frame 2. Next, after the ball head pull rod 4 is docked with the connecting tube 43, it is docked with the cable. Finally, the thin end of the steel sleeve 6 is inserted into the inner hole of the spring tube, welded to the spring tube, and the handle assembly is installed.

[0049] The above-mentioned hemostatic clip clamps the target affected part by closing two symmetrical clips 1 to achieve the effect of hemostasis and wound closure. The opening and closing states of the hemostatic clip during the trial operation are as follows: Figure 1 , Figure 2 , Figure 8 and Fig. 9 As shown. When the ball head pull rod 4 is pushed forward, the two clips 1 are opened under the action of the fixed pin 3 and the ball head 40; when the ball head pull rod 4 is pulled backward, the two clips 1 are closed under the action of the fixed pin 3 and the ball head 40. With the reciprocating motion of the ball head pull rod 5, the clips 2 can be opened and closed multiple times. In this process, the fixed pin 3 slides in the inclined part 14 of the slide groove 13 of the two clips 1, and the hemispherical shell connection part 18 of the clip 1 moves up and down between the two branches of the fixing frame 2.

[0050] like Fig.10 As shown, when the hemostatic clip clamps the target tissue, the hemispherical shell connecting part 18 moves backward by pulling the ball head pull rod 4 backward; when the protrusion 19 outside the hemispherical shell connecting part 18 is stuck behind the annular flange 20 of the uppermost cavity 26 of the fixing frame 2, the two clips 1 are in a closed locking position. At the same time, the fixing pin 3 slides into the bent part 15 of the slide groove 13 and is locked synchronously.

[0051] The ball head pull rod 4 is continuously pulled backward, and the ball head 40 deforms the hemispherical shell type connection part 18, and the ball head 40 is separated from the hemispherical shell type connection part 18. The ball head pull rod 4 is continuously pulled backward, and the ball head 40 drives the steel sleeve 6 to force the plastic sleeve 5 to deform, and slide out of the plastic sleeve 5, so as to separate the front clamping part and the rear control part of the hemostatic clip. Then, the cable is pulled backward, and the ball head pull rod 4, the steel sleeve 6 and the spring tube move backward together.

[0052] The structure of the hemostatic clip provided by the present invention and its trial operation, closing locking and separation process are described in detail above. When the fixing frame 2, plastic sleeve 5 and steel sleeve 6 of the hemostatic clip are separated, the fixing frame 2, clip 1, fixing pin 3 and plastic sleeve 5 are left in the human digestive tract. In order to facilitate their excretion from the body, it is recommended that part or all of the fixing frame 2, clip 1, fixing pin 3 and plastic sleeve 5 be made of degradable biomaterials, so that during the process of hemostasis by the hemostatic clip, the above components can be gradually decomposed and finally completely excreted from the human body.

[0053] In summary, the hemostatic clip provided by the present invention realizes the opening and closing of the two clips through the ball head pull rod. Moreover, the hemostatic clip realizes the separation of the clamping part at the front end and the control part at the rear end through the cooperation of the ball head pull rod, the plastic sleeve and the steel sleeve. It has the advantages of simple structure, easy operation and high operational stability. It is a hemostatic clip suitable for wide use.

[0054] The above is a detailed description of the hemostatic clip provided by the present invention. For those skilled in the art, any obvious changes made to the present invention without departing from the essential spirit of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A hemostatic clip, comprising a fixing frame, two clips and a ball-end pull rod, wherein the two clips are arranged opposite to each other at the front end of the fixing frame, and the ball-end pull rod is used to drive the two clips to open and close; characterized in that: It also includes a plastic sleeve and a steel sleeve disposed at the lower part of the inner cavity of the fixing frame, wherein the plastic sleeve is disposed between the steel sleeve and the inner wall of the fixing frame; The ball head pull rod passes through the steel sleeve; After the ball head pull rod is separated from the clip, the ball head pull rod is pulled backward, so that the ball head drives the steel sleeve to slide out of the plastic sleeve. Among them, hemispherical shell type connecting parts are respectively arranged at the rear ends of the two clips, and the ball head pull rod includes a pull rod and a ball head arranged at the front end of the pull rod, and the ball head is confined inside the two hemispherical shell type connecting parts arranged opposite to each other; and the ball head is designed to be able to move backward to deform the hemispherical shell type connecting part, thereby separating the ball head from the hemispherical shell type connecting part.

2. The hemostatic clip according to claim 1, characterized in that: The inner surface of the plastic sleeve is an inclined conical surface, and the inner diameter of the top of the plastic sleeve is larger than the inner diameter of the bottom of the plastic sleeve; The dimensions of the inner surface of the plastic sleeve match the dimensions of the outer surface of the portion of the steel sleeve that mates with it.

3. The hemostatic clip according to claim 1, characterized in that: The steel sleeve is divided into two parts, the upper part is used to match the plastic sleeve, and the lower part is used to connect the spring tube.

4. The hemostatic clip according to claim 3, characterized in that: The outer surface of the upper part of the steel sleeve and the inner surface of the plastic sleeve are interference fit.

5. The hemostatic clip according to claim 1, characterized in that: A plurality of holes are arranged on the circumference of the fixing frame, and glue is injected into the fixing frame through the holes so that the plastic sleeve and the fixing frame are bonded together.

6. The hemostatic clip according to claim 1, characterized in that: The ball head pull rod includes a pull rod and a ball head arranged at the front end of the pull rod, the diameter of the ball head is larger than the diameter of the pull rod, and at the same time, the diameter of the ball head is larger than the inner diameter of the steel casing; the diameter of the pull rod is equal to the inner diameter of the steel casing.

7. The hemostatic clip according to claim 6, characterized in that: The ball head pull rod also includes a connecting tube, the top of the connecting tube is connected to the pull rod, and the bottom of the connecting tube is used to be connected to the cable.

8. The hemostatic clip according to claim 1, characterized in that: The fixing frame comprises a tube body and two brackets arranged at the front end of the tube body, and the two brackets extend upward independently from opposite sides of the tube body respectively; two clips are arranged between the two brackets at the front end of the fixing frame through a fixing pin shaft.

9. The hemostatic clip according to claim 8, characterized in that: The tube body comprises a plurality of stepped cavities, wherein the inner diameter of the upper cavity is smaller than the inner diameter of the lower cavity; the plastic sleeve and the steel sleeve are arranged inside the lowermost cavity.

10. The hemostatic clip according to claim 9, characterized in that: An annular flange is formed at the position where the topmost cavity meets the bracket.

11. The hemostatic clip according to claim 1, characterized in that: The hemispherical shell type connection parts are respectively arranged at the rear ends of the two clips; the ball head is restricted inside the two hemispherical shell type connection parts; The ball head moves backward to deform the hemispherical shell type connecting portion, and the ball head is separated from the hemispherical shell type connecting portion.

12. The hemostatic clip according to claim 11, characterized in that: A protrusion is formed on the outer wall of the hemispherical shell type connecting portion, which is used to cooperate with the annular flange arranged on the fixing frame to place the clip in a closed locking position.

13. The hemostatic clip according to claim 1, characterized in that: The fixing pin shafts respectively pass through the slide grooves arranged in the middle of the two clips, and restrict the two clips between the two brackets at the front end of the fixing frame.

14. The hemostatic clip according to claim 13, characterized in that: The slide slot includes an inclined portion and a bent portion, wherein the bent portion is disposed at a position of the slide slot close to the front end of the clip, and when the fixing pin moves into the bent portion, the two clips are in a closed locking position.

15. The hemostatic clip according to claim 14, characterized in that: The distance between the inclined portion and the outer wall of the clip gradually decreases from the rear end to the front end of the clip; The extending direction of the bent portion is parallel to the length direction of the clip.

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