Catheter limiting device for pancreaticojejunal stapler and pancreaticojejunal stapler

Abstract

The purpose of the present invention is to provide a catheter limiting device for a pancreatic-intestinal stapler and a pancreatic-intestinal stapler in view of the problem that the operation in the human body is complicated and the operation time is easily prolonged when the existing catheter is fixed to the human body. The catheter limiting device comprises a coaxially arranged fixed ring and a movable ring, and a folding piece connecting the movable ring and the fixed ring. The folding piece is in the shape of a long thin plate arranged along the axial direction of the fixed ring. Folding grooves are respectively arranged at both ends and in the middle of the folding piece. When the movable ring and the fixed ring are close to each other along the axial direction, the folding piece is bent at the folding groove and the middle of the folding piece is bent outward. The catheter limiting device is made of medical absorbable material. The pancreatic-intestinal stapler comprises a catheter and the above-mentioned catheter limiting device. A drainage hole is arranged at one end of the catheter. The fixed ring and the movable ring are sleeved on the catheter. The fixed ring is fixedly connected to the catheter, and the movable ring is not connected to the catheter. The movable ring is located at one end of the catheter limiting device away from the drainage hole. The limiting operation of the catheter using the structure of the present invention is simple and rapid, the operation time can be shortened, and the postoperative removal is very convenient.

Description

Technical Field

[0001] The invention relates to a medical device, in particular to a catheter limiting device for a pancreatico-enteric stapler and the pancreatico-enteric stapler. Background Art

[0002] Some surgeries require the temporary drainage of fluid from the body after the operation. During the operation, a catheter needs to be placed in the human body for drainage. After the operation, it is necessary to ensure that the part of the catheter outside the human body does not enter the human body at will and cause adverse effects on the human body. The catheter needs to be removed immediately after the body recovers. For example, after the pancreatic head is resected, a pancreaticojejunostomy is performed to allow pancreatic juice to flow back into the small intestine. This type of surgery requires reconstruction of the pancreaticojejunostomy. Since pancreatic juice is corrosive, when the pancreaticojejunostomy has not yet healed, the contact of the pancreaticojejunostomy with pancreatic juice will prolong the healing time, form fistulas or edema, and make the anastomosis difficult to heal. Therefore, it is best to drain the pancreatic juice out of the body before the pancreaticojejunostomy heals. A catheter can be used to pass through the small intestine and the abdominal wall to connect the pancreatic duct with the outside of the body. The pancreatic juice can be drained out of the body before the pancreaticojejunostomy heals. This requires the catheter to maintain a stable positional relationship with the human body. The catheter can be sutured to the abdominal wall or the structure of the stapler itself can be used to fix it to human tissue during the operation. However, when such a structure is installed, the operation in the human body is relatively complicated, which can easily prolong the operation time. It is also difficult to remove the catheter after the pancreaticojejunostomy heals. Summary of the invention

[0003] The purpose of the present invention is to provide a catheter limiting device for a pancreatico-enteric stapler and a pancreatico-enteric stapler to solve the problem that the existing catheter is complicated to operate in the human body and the operation time is easily prolonged when fixed to the human body.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A catheter limiting device for a pancreatico-enteric stapler comprises a fixed ring, a movable ring and a folding piece, wherein the folding piece is in the shape of an elongated strip and is axially arranged along the fixed ring, the two ends of the folding piece are respectively connected to the movable ring and the fixed ring, the fixed ring and the movable ring are coaxially arranged, the folding piece is in the shape of a thin plate, the plate surface of the folding piece faces the axis of the fixed ring, the two ends and the middle of the folding piece are respectively provided with folding grooves, when the movable ring approaches the fixed ring along the axial direction, the folding piece is bent at the folding groove and the middle of the folding piece is bent in a direction away from the axis of the fixed ring, and the catheter limiting device is made of medical absorbable material.

[0006] Preferably, there are multiple folding pieces evenly distributed around the axis of the fixed ring.

[0007] Preferably, the material of the folding groove of the folding piece is the thinnest part of the catheter limiting device.

[0008] Preferably, the folding groove is located on the outwardly facing surface of the folding piece.

[0009] Preferably, the folding groove is arranged along the plate surface and is in the shape of an elongated strip, and the length direction of the folding groove is perpendicular to the length direction of the folding piece.

[0010] Preferably, the cross section of the folding groove is an inwardly concave arc shape.

[0011] Preferably, the outer diameter of the fixed ring is equal to the outer diameter of the movable ring, and the outwardly facing plate surface of the folding piece and the outer surface of the fixed ring are on the same circumferential surface.

[0012] Preferably, a conical structure is provided at one end of the fixed ring facing away from the moving ring.

[0013] Preferably, an anti-rotation groove is provided on the outer circumference of the conical structure, and the anti-rotation groove is arranged along the generatrix direction of the outer circumference of the conical structure. There are multiple anti-rotation grooves that are evenly distributed on the outer circumference of the conical structure.

[0014] A pancreatico-enteric stapler comprises a catheter, a drainage hole is arranged on the tube wall at one end of the catheter, and also comprises the above-mentioned catheter limiting device, a fixed ring and a movable ring are sleeved on the catheter, the fixed ring is fixedly connected to the catheter, the movable ring is not connected to the catheter, and the movable ring is located at one end of the catheter limiting device away from the drainage hole.

[0015] The present invention has the following beneficial effects:

[0016] The catheter limiting device of the present invention comprises a fixed ring, a movable ring and a folding piece connecting the movable ring and the fixed ring. When used, the fixed ring is sleeved on the catheter and fixed with the catheter, the movable ring is sleeved on the catheter and can move along the axial direction of the catheter, the folding piece is in a long strip shape and is arranged along the axial direction of the fixed ring, and folding grooves are arranged at both ends and in the middle of the folding piece. During surgery, the catheter limiting device enters the cavity of the human body with the catheter in a posture where the fixed ring moves forward first. When used for a pancreatic intestinal stapler, the small intestine is entered. At this time, the catheter is pulled outward, and the tail end of the movable ring is blocked by the intestinal wall, so that the movable ring and the fixed ring are close to each other, so that the folding piece will bend at the folding groove, so that the middle of the folding piece is bent away from the axis of the fixed ring, so that the catheter limiting device expands in the radial direction and becomes unable to pass through the wound when entering, thereby limiting the catheter from continuing to move outward. In this way, only the catheter needs to be pulled after the catheter limiting device enters the human body to realize the installation of the catheter limiting device and the limiting of the catheter. The operation is simple and quick, and the operation actions in the human body during surgery can be greatly reduced, shortening the operation time. The catheter limiter is made of medical absorbable material. After the operation, the absorbable material is gradually absorbed by the human body. After a period of time, the material of the catheter limiter disappears, resulting in limit failure. At this time, the catheter can be removed by pulling it outward, which is very convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a schematic structural diagram of an embodiment of a catheter limiting device for a pancreatico-enteric stapler of the present invention, wherein the catheter limiting device is in an initial state;

[0018] Figure 2 1 is a schematic structural diagram of an embodiment of a catheter limiting device for a pancreatico-enteric stapler of the present invention, wherein the catheter limiting device is in a limiting state;

[0019] Figure 3 is a schematic structural diagram of an embodiment of a pancreatico-enteric stapler of the present invention;

[0020] Figure 4 is a schematic structural diagram of a winding fixing device in an embodiment;

[0021] Figure 5 This is a schematic diagram of the position of the pancreaticojejunal stapler and human organs when in use.

[0022] Explanation of the reference numerals: 10, catheter; 11, intrapancreatic area; 12, intraintestinal area; 13, extracorporeal area; 14, drainage hole; 20, wire winding fixing device; 21, fixing sleeve; 22, wire winding ear; 30, catheter limiting device; 31, fixed ring; 32, moving ring; 33, folding piece; 34, folding groove; 35, anti-rotation groove; 40, extracorporeal fixing device; 50, pancreas; 60, small intestine; 70, abdominal wall. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0024] A catheter limiting device 30, combined with Figure 1 and Figure 2As shown, the device comprises a fixed ring 31, a movable ring 32 and a folding piece 33. The fixed ring 31 and the movable ring 32 are coaxially arranged. The folding piece 33 is in a long strip shape and is arranged along the axial direction of the fixed ring. The folding piece 33 is arranged between the fixed ring 31 and the movable ring 32, and its two ends are respectively connected to the fixed ring 31 and the movable ring 32. Folding grooves 34 are respectively arranged at the two ends and the middle of the folding piece 33. When the movable ring 32 and the fixed ring 31 move axially and approach each other, the folding piece 33 can be bent outward along the radial direction of the fixed ring in the folding groove 34. In use, the fixed ring 31 of the catheter limiting device 30 is sleeved on the catheter 10 and fixed to the catheter 10, and the movable ring 32 is sleeved on the catheter 10 and can move along the axial direction of the catheter 10. When in use, one end of the fixed ring 31 first enters the human body. After the catheter limiting device 30 enters the human body in the initial state with the folding piece 33 straightened, the catheter 10 is pulled outward, and the end of the moving ring 32 away from the fixed ring 31 will first be blocked by human tissue. The catheter is pulled further, and the fixed ring 31 and the moving ring 32 are close to each other, and the folding piece is naturally bent and expanded in the axial direction, entering the limiting state. The catheter limiting device 30 in the limiting state cannot pass through the opening on the human body for the catheter limiting device 30 in the initial state to enter, thereby limiting the catheter 10 from further moving out of the human body. In this way, it is only necessary to insert the catheter with the catheter limiting device 30 into the human body, and after the catheter limiting device 30 is fully entered into the human body cavity, the catheter 10 is pulled outward to achieve the installation and limiting of the catheter limiting device 30. The operation is simple and quick, which can greatly reduce the operation in the human body during the operation and shorten the operation time. The catheter limiting device 30 is made of medical absorbable materials such as polylactic acid, polyvinyl alcohol, polydioxanone and the like. After the operation, the absorbable material is gradually absorbed by the human body, and the limiting fails. The catheter can be directly pulled out to achieve removal. It is best to set the folding groove 34 as the position where the material of the catheter limiting device is the thinnest. Such a structure can make the material at the folding groove 34 be absorbed first, so that the folding piece 33 falls off from the fixed ring and the movable ring. Without the blocking of the bent folding piece 33, the catheter limiting device will also enter a failure state. At this time, the catheter 10 is pulled outward, and the fixed ring 31 moves with the catheter 10 and pushes the movable ring 32 to pass through the human body after contacting the movable ring 32. Compared with the time required for the catheter limiting device as a whole to be completely absorbed, the speed at which the material at the folding groove 34 is completely absorbed is easier to control. For designers, the structure where the material at the folding groove 34 is the thinnest makes it easier to design the size of the folding piece 33 and the folding groove 34 according to the recovery speed of the human body, so that the catheter limiting device fails at the required time point.

[0025] Preferably, the folding piece 33 is provided with a long thin plate, the plate surface of the folding piece 33 is directly opposite to the axis of the fixed ring, the folding groove 34 is provided along the plate surface and is in the shape of a long strip, and the length direction of the folding groove 34 is perpendicular to the length direction of the folding piece 33, so that it is more convenient for the folding piece 33 to be bent. Preferably, a plurality of folding pieces 33 are provided, and these folding pieces 33 are evenly distributed circumferentially with the axis of the fixed ring 31 as the center, so that after each folding piece 33 is bent, the radial dimension of the catheter limiting device 30 can be relatively uniformly increased, which helps to improve the limiting effect and stability of the catheter limiting device 30. Preferably, the folding groove 34 is provided on the plate surface of the folding piece 33 facing outward, so that it is convenient to process the folding groove 34. The cross section of the folding groove 34 can be set to any shape, but it is preferably an inwardly concave arc shape, such a folding groove 34 is easy to process and can reduce the possibility of the folding piece 33 being directly broken at the folding groove 34 when being bent. It is best that the fixed ring and the movable ring are coaxial and have equal outer diameters, and the outward plate surface of the folding member 33 and the outer circumferential surfaces of the fixed ring and the movable ring are on the same circumferential surface, so that the resistance of the catheter limit device when entering the human body is small.

[0026] Preferably, a conical structure is provided at one end of the fixed ring 31 facing away from the movable ring 32, so that the conical portion of the fixed ring 31 can be easily inserted into the wound of the intestinal wall and the abdominal wall during installation. Preferably, a plurality of anti-rotation grooves 35 are provided on the outer circumference of the conical structure, and these anti-rotation grooves 35 are evenly distributed on the outer circumference of the conical structure. The anti-rotation grooves 35 are long strips and are provided along the generatrix direction of the outer circumference of the conical structure. When the movable ring 31 rotates, the anti-rotation grooves 35 can increase the friction between the movable ring 32 and the human tissue, thereby reducing the possibility of the catheter limiting device 30 rotating, and further reducing the possibility of the entire stapler rotating and pulling the pancreatico-intestinal anastomosis.

[0027] Absorption grooves can be set on the outer surfaces of the fixed ring 31 and the movable ring 32. The absorption grooves can accelerate the absorption of the material and help reduce the external dimensions of the fixed ring 31 and the movable ring 32 when the pancreatico-enteric anastomosis is healing, thereby reducing the resistance when the stapler is removed. The absorption grooves can be set to various shapes such as square, circular, and annular, as long as the material can be removed. In this embodiment, the anti-rotation groove 35 can also serve as the absorption groove on the fixed ring 31, and the absorption groove on the movable ring 32 is not shown in the figure.

[0028] The catheter limiting device 30 of the present invention can be used in various surgical instruments that need to set up a catheter 10 for drainage and need to limit the movement of the catheter 10 into the human body, such as a pancreatic-intestinal stapler. Figure 3As shown, it includes a catheter 10 for draining pancreatic juice and the above-mentioned catheter stopper 30. The catheter 10 is a slender tube, and the catheter 10 is divided into an intrapancreatic area 11, an intestinal area 12 and an extrapancreatic area 13 in its length direction. When in use, the extrapancreatic area 13 is mainly located outside the human body, the intestinal area 12 is located in the small intestine 60, and the intrapancreatic area 11 is located in the pancreatic duct. The wall of the intrapancreatic area 11 of the catheter is provided with a drainage hole 14 connecting the inside and outside of the catheter 10. The catheter stopper 30 is arranged at the junction of the intestinal area 12 and the extrapancreatic area 13, wherein the fixed ring 31 is located at one end close to the intrapancreatic area 11.

[0029] like Figure 5 As shown, when in use, a detachable external fixing device 40 is provided in vitro in conjunction with the catheter limiting device 30 to fix the catheter 10 in the external area 13 to prevent the catheter 10 in the external area 13 from entering the human body. The external fixing device 40 can be a common medical adhesive tape, through which the catheter 10 is adhered to the skin outside the body; the external fixing device 40 can also be a special catheter 10 fixing device, such as a catheter 10 fixing device disclosed in Chinese patent application number 201721806118.9, or a pancreatic duct external drainage fixing device disclosed in Chinese patent application number 201820952118.8, as long as the catheter 10 in the external area 13 can be stably fixed outside the body.

[0030] When using the pancreatico-intestinal stapler of the present invention, the stapler is first inserted into the human body, the catheter 10 passes through the abdominal wall 70, penetrates the small intestine 60 and enters the pancreatic duct, the pancreatic region 11 enters the pancreatic duct, the intestinal region 12 and the unexpanded catheter limiting device 30 all enter the small intestine 60, and the catheter limiting device 30 is in the initial state during insertion, and then the pancreatic section, the pancreatic duct section and the intestinal wall are sutured. After the suturing is completed, the catheter 10 is pulled outward, and the fixed ring 31 moves accordingly to approach the dynamic ring 32 that presses against the intestinal wall. In this process, the folding piece 33 is bent outward to make the catheter limiting device 30 become a limited state. The catheter limiting device 30 in the limited state cannot pass through the intestinal wall and the wound on the abdominal wall, and then the catheter 10 is fixed from outside the body by the in vitro fixing device 40 to complete the installation of the pancreatico-intestinal stapler.

[0031] During the healing process of the pancreaticojejunostomy, the material of the catheter limiting device 30 is gradually absorbed by the human body. After the pancreaticojejunostomy is healed, the material at the folding groove 34 is first absorbed and completely, and the folding piece 33 falls off. At this time, the catheter 10 is pulled outward, and the dynamic ring 32, the fixed ring 31 and the fixed sleeve 21 on the catheter 10 can pass through the openings on the small intestine 60 and the abdominal wall 70 in turn to remove the anastomosis device.

[0032] In order to improve the stability of the catheter in the pancreas, the pancreaticojejunal stapler may also be provided with a fixing device for fixing the relative position between the pancreaticojejunal anastomosis and the catheter 10. The fixing device may be of any structure as long as the relative position between the catheter and the pancreaticojejunal anastomosis can be fixed. For example, it may be a winding fixing device 20, such as Figure 4 As shown, it includes a fixed sleeve 21 and a winding ear 22. The inner wall of the fixed sleeve 21 is adapted to the outer wall of the catheter 10 and is fixedly sleeved at the junction of the pancreatic region 11 and the intestinal region 12 of the catheter. When in use, one end of the fixed sleeve 21 blocks the gap between the pancreatic duct and the catheter to prevent pancreatic fluid from flowing out of the gap between the pancreatic duct and the catheter 10. The winding ear 22 is arranged in the direction of the tube centerline of the fixed sleeve and is fixedly arranged on the outer circumferential surface of the fixed sleeve 21, wherein one end of the winding ear 22 facing the pancreatic region 11 is connected to the fixed sleeve 21, and the other end is a free end. When in use, the sutures for suturing the intestinal wall, the cross section of the pancreas 50 and the pancreatic duct fracture are wound around the root of the winding ear 22, so that the pancreatico-intestinal anastomosis and the stapler are relatively fixed, thereby preventing the stapler from falling off before the wound is healed. The wire winding fixing device 20 is made of medical absorbable material. After a period of time, the material is completely absorbed, so that the suture wire wrapped around the root of the wire winding ear 22 will be separated from the catheter 10, which is convenient for subsequent removal.

[0033] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention.

Claims

1. A catheter limiting device for a pancreatico-enteric stapler, characterized in that: The invention comprises a fixed ring (31), a movable ring (32) and a folding piece (33), wherein the folding piece (33) is in the shape of an elongated strip and is arranged axially along the fixed ring (31), the two ends of the folding piece (33) are respectively connected to the movable ring (32) and the fixed ring (31), the fixed ring (31) and the movable ring (32) are arranged coaxially, the folding piece (33) is in the shape of a thin plate, the plate surface of the folding piece (33) is directly opposite to the axis of the fixed ring (31), the two ends and the middle of the folding piece (33) are respectively provided with folding grooves (34), when the movable ring and the fixed ring are close to each other along the axial direction, the folding piece (33) is bent at the folding groove (34) and the middle of the folding piece (33) is bent in the direction away from the axis of the fixed ring, and the catheter limiting device is made of a medical absorbable material; The material at the location where the folding groove (34) is provided on the folding piece (33) is the thinnest part of the material in the catheter limiting device; A conical structure is provided at one end of the fixed ring (31) facing away from the moving ring (32); An anti-rotation groove (35) is provided on the outer circumference of the conical structure. The anti-rotation groove (35) is arranged along the generatrix direction of the outer circumference of the conical structure. A plurality of anti-rotation grooves (35) are provided and are evenly distributed on the outer circumference of the conical structure. An absorption groove is arranged on the outer surface of the moving ring (32).

2. The catheter limiting device for a pancreatico-enteric stapler according to claim 1, characterized in that: A plurality of folding pieces (33) are provided and are evenly distributed around a circle with the axis of the fixed ring (31) as the center.

3. The catheter limiting device for a pancreatico-enteric stapler according to claim 1, characterized in that: The folding groove (34) is located on the outward surface of the folding piece (33).

4. The catheter limiting device for a pancreatico-enteric stapler according to claim 3, characterized in that: The folding groove (34) is arranged along the plate surface and is in the shape of an elongated strip, and the length direction of the folding groove (34) is perpendicular to the length direction of the folding piece (33).

5. The catheter limiting device for a pancreatico-enteric stapler according to claim 4, characterized in that: The cross section of the folding groove (34) is an inwardly concave arc shape.

6. The catheter limiting device for a pancreatico-enteric stapler according to claim 1, characterized in that: The outer diameter of the fixed ring (31) is equal to the outer diameter of the movable ring (32), and the outwardly facing plate surface of the folding piece (33) and the outer surface of the fixed ring are on the same circumferential surface.

7. A pancreatico-enteric stapler, comprising a catheter (10), wherein a drainage hole (14) is provided on the wall of one end of the catheter (10), wherein: It also includes a catheter limiting device as described in any one of claims 1 to 6, wherein a fixed ring (31) and a movable ring (32) are sleeved on the catheter (10), the fixed ring (31) is fixedly connected to the catheter (10), the movable ring (32) is slidably connected to the catheter (10), and the movable ring (32) is located at one end of the catheter limiting device away from the drainage hole (14).

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