Auxiliary purse-string suture device for peritoneal dialysis catheterization

Abstract

The invention discloses an auxiliary purse-string suturing device for peritoneal dialysis catheterization, and relates to the field of peritoneal dialysis catheterization, the auxiliary purse-string suturing device comprises a mounting mechanism, the mounting mechanism comprises a mounting main rod, the surface of the mounting main rod is provided with an adjusting groove, the surface of the adjusting groove is provided with an adjusting mechanism, the adjusting mechanism comprises an adjusting ring and a fixing ring, and the fixing ring is provided with a fixing groove. The adjusting ring and the fixing ring are both sleeved with an adjusting groove in the surface of the mounting main rod, the fixing ring is fixedly connected with the adjusting groove, and the adjusting ring is slidably connected with the adjusting groove. According to the auxiliary purse-string suturing device for the peritoneal dialysis catheterization, the edge of the flexible protective skin is tightly buckled on the inner surface of the peritoneum, so that an intestinal canal and the omentum majus are isolated outside a suturing area, a closed compartment is established, medical staff can conveniently conduct peritoneal purse-string suturing in the protection area of the flexible protective skin, the risk of secondary injury is reduced, and the operation is convenient. And the opening size of the flexible protective leather can be flexibly adjusted, so that the device is suitable for auxiliary work of purse-string suture with different opening sizes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of peritoneal dialysis catheterization, in particular, an auxiliary purse-string suture device for peritoneal dialysis catheterization. BACKGROUND

[0002] Purse-string suture is a surgical term, also known as bag mouth suture, like the lacing around the tobacco purse, the method is to make continuous suture around the opening, while turning the tissue or stump inward from the purse, tighten the suture and knot, which is a common surgical procedure for peritoneal dialysis catheterization.

[0003] When performing peritoneal purse-string suture, it is necessary to prevent injury to the intestine and omentum, especially for patients with high intra-abdominal pressure, the intestine and greater omentum are easy to flow out from the peritoneal incision, auxiliary devices need to be used to assist in purse-string suture, but the protection effect of the existing auxiliary device is not ideal, and it is difficult to form a closed compartment, it is difficult to completely block the intestine and greater omentum in patients with high intra-abdominal pressure, which can easily lead to omental injury or even be directly sutured to the peritoneum, causing secondary injury to the patient.

[0004] Therefore, the technical personnel in the art proposes an auxiliary purse-string suture device for peritoneal dialysis catheterization to solve the problem in the background art. SUMMARY

[0005] The purpose of the present application is to provide an auxiliary purse-string suture device for peritoneal dialysis catheterization, to solve the problem that the protection effect of the existing auxiliary device is not ideal, it is difficult to form a closed compartment, it is difficult to completely block the intestine and greater omentum in patients with high intra-abdominal pressure, which can easily lead to omental injury or even be directly sutured to the peritoneum, causing secondary injury to the patient.

[0006] In order to achieve the above object, the present application provides the following technical scheme: an auxiliary purse-string suture device for peritoneal dialysis catheterization, comprising a mounting mechanism, the mounting mechanism comprises a mounting main rod, the surface of the mounting main rod is provided with an adjusting groove, the surface of the adjusting groove is provided with an adjusting mechanism, the adjusting mechanism comprises an adjusting ring and a fixing ring, the adjusting ring and the fixing ring are sleeved in the adjusting groove on the surface of the mounting main rod, the fixing ring is fixedly connected with the adjusting groove, the adjusting ring is slidably connected with the adjusting groove, a plurality of groups of first mounting blocks are arranged at the bottom of the adjusting ring, each group of the first mounting blocks is two, and two first mounting blocks in each group are rotatably connected with an adjusting rod, a plurality of groups of side blocks are arranged on the side edge of the fixing ring, each group of the side blocks is two, and two side blocks in each group are rotatably connected with an adjusting mounting rod, a second mounting block is arranged on the upper surface of each adjusting mounting rod, and there are two second mounting blocks on the upper surface of each adjusting mounting rod, one end of the adjusting rod away from the first mounting rod is rotatably connected with the second mounting block, and a protection mechanism is arranged on the outer side of the adjusting mounting rod, the protection mechanism comprises a flexible protection skin, the flexible protection skin is in a funnel shape, a plurality of supporting ribs are arranged on the inner side of the flexible protection skin, and the number of the supporting ribs corresponds to the adjusting mounting rod.

[0007] Preferably, the inside of the mounting main rod is provided with a mounting bin, a plurality of springs are arranged in the mounting bin, one end of each spring close to the mounting groove is provided with a clamping block, the clamping block penetrates through the mounting bin and extends to the outside of the mounting main rod, and the clamping block is slidably connected with the mounting main rod.

[0008] Preferably, the bottom of the adjusting groove is provided with a bottom plate, the upper surface of the bottom plate is fixedly connected with a sealing gasket, and a plurality of positioning holes are arranged on the upper surfaces of the bottom plate and the sealing gasket.

[0009] Preferably, the side edge of the adjusting ring is provided with a movable groove, the position of the movable groove corresponds to that of the clamping block, a pressing block is arranged in the movable groove, the pressing block is in contact with the clamping block, one end of the pressing block away from the clamping block is fixedly connected with a pressing gasket, and the two ends of the pressing gasket are fixedly connected with the adjusting ring through a connecting gasket.

[0010] Preferably, the inside of the adjusting mounting rod is provided with a fixing bolt, the upper surface of the supporting rib is provided with a mounting groove, the mounting groove is provided with a mounting hole in the inside, the mounting groove and the adjusting mounting rod are matched with each other, and the fixing bolt in the inside of the adjusting mounting rod penetrates through the adjusting mounting rod and is threadedly connected with the mounting hole.

[0011] Preferably, the bottom of the flexible protection skin is provided with a flexible base, the middle of the flexible base is hollow, the bottom of the flexible base is provided with a plurality of fixing rods, and the fixing rods are matched with the positioning holes.

[0012] Preferably, the bottom of the installation main rod is provided with an inflation mechanism, the inflation mechanism comprises an inflation channel, the inflation channel is located inside the installation main rod, the bottom of the installation main rod is internally provided with a buffer air cavity, the buffer air cavity is in communication with the inflation channel, and the top of the installation main rod is provided with an interface, and the interface is externally provided with threads.

[0013] Preferably, the bottom side of the installation main rod is provided with an air bag, the air bag is hollow, the buffer air cavity is internally provided with a connecting hole, the connecting hole penetrates the buffer air cavity and the sidewall of the air bag, and the inside of the air bag and the buffer air cavity are in communication through the connecting hole.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1、The flexible base is passed through the installation main rod, the fixing rod at the bottom of the flexible base is matched and connected with the positioning hole formed in the surface of the bottom plate and the sealing gasket, then the flexible base is fixed on the surface of the bottom plate and sealed by the sealing gasket, then the pressing pad is pressed to press the pressing block, the pressing block extrudes the clamping block, the clamping block presses the spring, the adjusting ring can move up and down in the adjusting groove, the adjusting ring drives the adjusting rod to rotate between the first mounting block and the second mounting block when the adjusting ring moves up and down, the adjusting mounting rod rotates on the side of the side block, then the adjusting mounting rod is located in the installation groove, and the installation is completed by screwing the fixing bolt through the adjusting mounting rod and the mounting hole in the installation groove, then the size of the flexible protective skin can be changed by changing the position of the adjusting ring, then the edge of the flexible protective skin is tightly buckled to the inner surface of the peritoneum by the slight pulling force of the surgical assistant or the lifting device, so that the intestine and the greater omentum are isolated outside the suture area to establish a closed compartment, and the medical staff can perform peritoneal purse suture in the protection area of the flexible protective skin, thereby reducing the risk of secondary injury.

[0016] 2、After the protection mechanism establishes the closed compartment, the medical injector is connected to the interface at the top of the installation main rod, air is slowly injected, the injection amount is observed through the scale of the injector, the patient's feelings are inquired during the injection process to avoid abdominal distension, pain and other discomforts, after the inflation is completed, the valve of the injector is closed, and the shape of the air bag is observed: if the air bag appears local depression, the inflation needs to be supplemented, if the pressure is too high, part of the air is slowly released until the appropriate pressure is reached, so as to further fix the position of the device and buffer the pressure fluctuation in the abdominal cavity to avoid the extrusion of the intestine of the patient with high intra-abdominal pressure. BRIEF DESCRIPTION OF DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a front view of the protective mechanism in this invention;

[0020] Figure 3 This is a top view of the protective mechanism in this invention;

[0021] Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the adjustment mechanism and the installation mechanism in this invention;

[0023] Figure 6 This is a schematic diagram of the adjustment mechanism in this invention;

[0024] Figure 7 This is a schematic diagram of the installation mechanism in this invention;

[0025] Figure 8 This is a cross-sectional view of the mounting mechanism in this invention.

[0026] In the picture:

[0027] 1. Installation Mechanism; 101. Main Mounting Rod; 102. Adjustment Groove; 103. Locking Block; 104. Base Plate; 105. Sealing Gasket; 106. Positioning Hole; 107. Spring; 108. Mounting Chamber; 2. Adjustment Mechanism; 201. Adjustment Ring; 202. Adjustment Mounting Rod; 203. Adjustment Rod; 204. Fixing Bolt; 205. Fixing Ring; 206. First Mounting Block; 207. Second Mounting Block; 208. Side Block; 209. Pressing Pad; 210. Pressing Block; 3. Protective Mechanism; 301. Flexible Protective Sheet; 302. Support Rib; 303. Mounting Groove; 304. Mounting Hole; 305. Flexible Base; 306. Fixing Rod; 4. Inflation Mechanism; 401. Airbag; 402. Interface; 403. Buffer Air Chamber; 404. Inflation Channel; 405. Connection Hole. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] As attachedFigure 1 To be continued Figure 8 As shown:

[0030] Example 1: This invention provides an auxiliary purse-string suture device for peritoneal dialysis catheter placement, comprising an installation mechanism 1. The installation mechanism 1 includes an installation main rod 101, which is made of 361L medical-grade stainless steel, possessing high strength and corrosion resistance. An adjustment groove 102 is formed on the surface of the installation main rod 101, and an installation chamber 108 is formed inside the installation main rod 101. Several springs 107 are arranged inside the installation chamber 108, and each spring 107 has a locking block 103 at one end near the installation groove 303. The locking block 103 passes through the installation chamber 108 and extends to the outside of the installation main rod 101. The locking block 103 is slidably connected to the installation main rod 101. The springs 107 are medical-grade stainless steel springs 107, and the locking blocks 103 are made of polyetheretherketone (PEEK) material, possessing good biocompatibility and wear resistance.

[0031] The spring 107 always applies an outward pushing force to the locking block 103, causing the locking block 103 to engage in the movable groove on the side of the adjusting ring 201, thereby fixing the adjusting ring 201. Through the cooperation of the spring 107 and the locking block 103, the adjusting ring 201 can be quickly locked and released, which facilitates the adjustment of the protection range during the operation. The operation is simple, stable and reliable.

[0032] The bottom of the adjustment groove 102 is provided with a base plate 104, and a sealing gasket 105 is fixedly connected to the upper surface of the base plate 104. The base plate 104 is made of 361L medical stainless steel. 361L medical stainless steel is corrosion resistant, has high strength, can be sterilized at high temperature, and has no adverse reactions when in contact with human tissue for a long time. Several positioning holes 106 are opened on the upper surfaces of the base plate 104 and the sealing gasket 105. Each positioning hole 106 penetrates the base plate 104 and the sealing gasket 105. The sealing gasket 105 is made of medical silicone rubber. Medical silicone rubber has good elasticity, strong sealing performance, and is non-allergenic when in contact with the human body. It is suitable for repeated use of the snap-fit ​​structure.

[0033] The base plate 104 and the mounting rod 101 are integrally formed. The sealing gasket 105 on its surface adopts a textured design (texture depth 0.3mm). When the flexible base 305 is in contact, it can enhance the sealing performance and prevent intra-abdominal fluid from seeping into the gap of the device. The positioning hole 106 and the fixing rod 306 of the flexible base 305 are interference fit. After insertion, the protective mechanism 3 can be quickly fixed.

[0034] Before the operation, the main rod 101 is placed vertically above the surgical incision, ensuring that the base plate 104 is in contact with the skin surface. The flexible protective skin 301 is taken, and the fixing rod 306 of the flexible base 305 at its bottom is aligned with the positioning hole 106 of the base plate 104. The fixing rod 306 is gently pressed to fully insert it, thus completing the initial fixation of the protective mechanism 3. The fit between the sealing gasket 105 and the flexible base 305 is checked to ensure that there are no obvious gaps.

[0035] In one embodiment of the present invention, an adjustment mechanism 2 is provided on the surface of the adjustment groove 102. The adjustment mechanism 2 includes an adjustment ring 201 and a fixed ring 205. The adjustment ring 201 and the fixed ring 205 are made of 361L medical stainless steel. The adjustment ring 201 and the fixed ring 205 are both sleeved in the adjustment groove 102 on the surface of the mounting main rod 101. The fixed ring 205 is fixedly connected to the adjustment groove 102, and the adjustment ring 201 is slidably connected to the adjustment groove 102. A plurality of sets of first mounting blocks 206 are provided at the bottom of the adjustment ring 201, and each set of first mounting blocks 206 consists of two blocks. An adjusting rod 203 is rotatably connected between each of the two first mounting blocks 206. Several sets of side blocks 208 are provided on the side of the fixing ring 205, with two side blocks 208 in each set. An adjusting mounting rod 202 is rotatably connected between the two side blocks 208 in each set. The adjusting rod 203 and adjusting mounting rod 202 are made of titanium alloy, which is lightweight and has high strength. A second mounting block 207 is provided on the upper surface of each adjusting mounting rod 202, with two second mounting blocks 207 on the upper surface of each adjusting mounting rod 202. The end of the adjusting rod 203 furthest from the first mounting rod is connected to the second mounting block 207. The mounting block 207 is rotatably connected. The adjusting ring 201 has a movable groove on its side, corresponding to the position of the locking block 103. A pressing block 210 is provided inside the movable groove, contacting the locking block 103. A pressing pad 209 is fixedly connected to the end of the pressing block 210 away from the locking block 103. Both ends of the pressing pad 209 are fixedly connected to the adjusting ring 201 via connecting pads. Pressing the pressing pad 209 retracts the locking block 103, allowing the adjusting ring 201 to move up and down along the adjusting groove 102. The adjusting rod 203 is rotatably connected to the mounting block, driving the adjusting mounting rod 20... 2. The opening angle of the protective mechanism 3 can be adjusted by unfolding or retracting it. The mechanical linkage structure is reasonably designed and can accurately control the protection range, thereby adapting to purse-string suture auxiliary work with different opening sizes and improving surgical adaptability. The adjusting mounting rod 202 is provided with a fixing bolt 204 inside. The upper surface of the support rib 302 is provided with a mounting groove 303. The mounting groove 303 is provided with a mounting hole 304 inside. The mounting groove 303 matches the adjusting mounting rod 202. The fixing bolt 204 inside the adjusting mounting rod 202 passes through the adjusting mounting rod 202 and is threadedly connected to the mounting hole 304.

[0036] The adjusting ring 201 and the adjusting groove 102 are in sliding fit. Under normal conditions, the position is locked by the engagement of the locking block 103 and the movable groove. When adjustment is required, the pressing pad 209 is pressed, which drives the pressing block 210 to squeeze the locking block 103 through the deformation of the connecting pad. This causes the locking block 103 to compress the spring 107 and retract into the mounting chamber 108. At this time, the adjusting ring 201 can slide up and down along the adjusting groove 102. When the adjusting ring 201 moves, it drives the first mounting block 206 to rise and fall synchronously. Through the rotation of the adjusting rod 203, the adjusting mounting rod 202 is pushed to rotate around the side block 208 (rotation angle 0-60°), thereby changing the unfolding radius of the adjusting mounting rod 202. Finally, it drives the support rib 302 of the flexible protective skin 301 to unfold or retract synchronously. The adjusting mounting rod 202 and the support rib 302 are connected by the fixing bolt 204 (M3 medical screw). The fit between the mounting groove 303 and the adjusting mounting rod 202 is ≥90%, ensuring no shaking after connection.

[0037] Specifically, the surgeon determines the required unfolding diameter of the flexible protective skin 301 based on the size of the patient's abdominal incision (e.g., 3cm for adults, 2cm for children). Using their thumb, the surgeon presses the pressure pads 209 on both sides of the adjusting ring 201. After feeling the locking block 103 fully retract, the surgeon slowly pushes the adjusting ring 201 up and down along the adjusting groove 102: when moving upwards, the unfolding radius of the adjusting mounting rod 202 increases; when moving downwards, the unfolding radius decreases. Once the flexible protective skin 301 has unfolded to the target diameter, the pressure pads 209 are released, the spring 107 pushes the locking block 103 back to its original position, and the adjusting ring 201 is re-locked. The surgeon then uses a wrench to tighten the fixing bolts 204 on the adjusting mounting rod 202, ensuring a secure connection between the support rib 302 and the adjusting mounting rod 202, avoiding over-tightening that could damage the components.

[0038] In one embodiment of the present invention, a protective mechanism 3 is provided on the outer side of the adjusting mounting rod 202. The protective mechanism 3 includes a flexible protective skin 301, which is funnel-shaped. A plurality of supporting ribs 302 are provided on the inner side of the flexible protective skin 301, the number of which corresponds to the adjusting mounting rod 202. The flexible protective skin 301 is made of medical-grade expanded polytetrafluoroethylene (ePTFE). Medical-grade ePTFE is ultra-thin (0.1-0.2 mm thick), has good breathability, and provides a non-invasive sensation when applied to the peritoneum, preventing tissue adhesion. The supporting ribs 302... The flexible protective skin 301 is supported by medical-grade nylon 66, which is highly resilient (200% elongation at break) and resistant to bending, allowing for shape adjustments to accommodate different abdominal cavity spaces. A flexible base 305 is located at the bottom of the flexible protective skin 301, with a hollow center. Several fixing rods 306 are located at the bottom of the flexible base 305, and these fixing rods 306 match the positioning holes 106. The flexible base 305 is made of medical-grade nylon 66. The flexible protective skin 301 has a funnel-shaped design, and its inner supporting ribs 302 provide radial support, ensuring the protective skin maintains a stable shape and does not collapse after unfolding.

[0039] After the protective mechanism 3 is fixed and adjusted, the surgical assistant gently lifts the edge of the flexible protective skin 301 with forceps so that the inner side of the protective skin is closely attached to the inner surface of the peritoneum (lifting force 50-100g, avoid excessive lifting to avoid peritoneal traction pain). The surgeon performs peritoneal purse-string sutures within the protection area of ​​the protective skin. At this time, the intestines and greater omentum are isolated on the outside of the protective skin and cannot enter the suture area.

[0040] Example 2: This example is basically the same as the previous example, except that the position of the device is further fixed by inflating the airbag 401, while buffering intra-abdominal pressure fluctuations to avoid intestinal compression in patients with high intra-abdominal pressure (such as patients with cirrhosis and ascites, where intra-abdominal pressure can reach 20-30 cmH2O). An inflation mechanism 4 is provided at the bottom of the mounting main rod 101. The inflation mechanism 4 includes an inflation channel 404 located inside the mounting main rod 101. The mounting main rod 101 has an opening... A buffer air chamber 403 is provided inside the bottom end of the adjusting groove 102. The buffer air chamber 403 is connected to the inflation channel 404. An interface 402 is provided at the top of the mounting main rod 101. The interface 402 has threads on its outer side. An airbag 401 is provided on the bottom side of the mounting main rod 101. The airbag 401 is hollow. A connecting hole 405 is provided inside the buffer air chamber 403. The connecting hole 405 passes through the buffer air chamber 403 and the side wall of the airbag 401. The interior of the airbag 401 and the buffer air chamber 402 are connected. The air chambers 403 are connected by connecting holes 405. The airbag 401 is made of medical-grade nitrile rubber, which has a high elastic recovery rate (≥95%) and is resistant to aging. After inflation, it can fit tightly against the abdominal cavity wall without the risk of air leakage. The interface 402 (with standard Luer locking thread) at the top of the mounting rod 101 can be connected to a medical syringe. Air is injected into the buffer air chambers 403 through the inflation channel 404, and the buffer air chambers 403 introduce air into the airbag 401 through the connecting holes 405. The airbag 401 is in its initial state. It is flat with an initial diameter of 0.3cm-0.8cm, which can be flexibly selected according to the peritoneal incision. After inflation, it expands to a diameter of 3-4cm and a thickness of 1-2mm. The anti-slip texture on its surface can enhance the friction with the abdominal wall and prevent the device from shifting during the operation. The design of the buffer air chamber 403 can avoid a sudden increase in pressure during inflation: when the injected air pressure exceeds 30cmH2O, the elastic wall of the buffer air chamber 403 will deform, slowing down the pressure transmission speed and preventing the air bladder 401 from over-inflating and damaging the abdominal tissue.

[0041] Specifically, after the protective mechanism 3 is constructed, the medical syringe is connected to the interface 402 at the top of the main rod 101, and air is slowly injected (injection speed 1-2ml / s). The injection volume is observed through the syringe scale: 5-8ml for adult patients and 3-5ml for pediatric patients. During the injection, the patient is asked about their feelings to avoid discomfort such as abdominal distension and pain. After inflation is completed, the syringe valve is closed to further fix the position of the device and buffer intra-abdominal pressure fluctuations to avoid intestinal compression in patients with high intra-abdominal pressure.

[0042] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An auxiliary purse-string suture device for peritoneal dialysis catheter placement, characterized in that: The system includes an installation mechanism (1), which includes an installation main rod (101). An adjustment groove (102) is provided on the surface of the installation main rod (101). An adjustment mechanism (2) is provided on the surface of the adjustment groove (102). The adjustment mechanism (2) includes an adjustment ring (201) and a fixing ring (205). Both the adjustment ring (201) and the fixing ring (205) are fitted into the adjustment groove (102) on the surface of the installation main rod (101). The fixing ring (205) is fixedly connected to the adjustment groove (102), and the adjustment ring (201) is slidably connected to the adjustment groove (102). Several sets of first installation blocks (206) are provided at the bottom of the adjustment ring (201). Each set of first installation blocks (206) consists of two blocks. An adjustment rod (203) is rotatably connected between the two first installation blocks (206) in each set. The fixing ring (205)... The side is provided with several sets of side blocks (208), each set of side blocks (208) consists of two, and each set of two side blocks (208) is rotatably connected to an adjusting mounting rod (202). Each adjusting mounting rod (202) has a second mounting block (207) on its upper surface. Each adjusting mounting rod (202) has two second mounting blocks (207) on its upper surface. The end of the adjusting rod (203) away from the first mounting rod is rotatably connected to the second mounting block (207). A protective mechanism (3) is provided on the outside of the adjusting mounting rod (202). The protective mechanism (3) includes a flexible protective skin (301). The flexible protective skin (301) is funnel-shaped. Several supporting ribs (302) are provided on the inner side of the flexible protective skin (301). The number of supporting ribs (302) corresponds to the number of adjusting mounting rods (202).

2. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 1, characterized in that: The mounting main rod (101) has an installation chamber (108) inside. The installation chamber (108) is provided with a number of springs (107). Each spring (107) has a locking block (103) at one end near the mounting groove (303). The locking block (103) passes through the installation chamber (108) and extends to the outside of the mounting main rod (101). The locking block (103) is slidably connected to the mounting main rod (101).

3. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 1, characterized in that: The bottom of the adjustment groove (102) is provided with a base plate (104), and a sealing gasket (105) is fixedly connected to the upper surface of the base plate (104). A number of positioning holes (106) are opened on the upper surfaces of the base plate (104) and the sealing gasket (105), and each positioning hole (106) penetrates the base plate (104) and the sealing gasket (105).

4. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 1, characterized in that: The adjusting ring (201) has a movable groove on its side, which corresponds to the position of the locking block (103). A pressing block (210) is provided inside the movable groove. The pressing block (210) contacts the locking block (103). A pressing pad (209) is fixedly connected to one end of the pressing block (210) away from the locking block (103). The two ends of the pressing pad (209) are fixedly connected to the adjusting ring (201) through connecting pads.

5. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 1, characterized in that: The adjusting mounting rod (202) is provided with a fixing bolt (204) inside. The upper surface of the support rib (302) is provided with a mounting groove (303). The mounting groove (303) is provided with a mounting hole (304) inside. The mounting groove (303) matches the adjusting mounting rod (202). The fixing bolt (204) inside the adjusting mounting rod (202) passes through the adjusting mounting rod (202) and is threadedly connected to the mounting hole (304).

6. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 1, characterized in that: The bottom of the flexible protective skin (301) is provided with a flexible base (305), the middle of the flexible bottom is hollow, and the bottom of the flexible base (305) is provided with a number of fixing rods (306), the fixing rods (306) and the positioning holes (106) are matched with each other.

7. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 1, characterized in that: An inflation mechanism (4) is provided at the bottom of the mounting main rod (101). The inflation mechanism (4) includes an inflation channel (404) located inside the mounting main rod (101). A buffer air chamber (403) is provided inside the bottom end of the mounting main rod (101) which has an adjustment groove (102). The buffer air chamber (403) is connected to the inflation channel (404). An interface (402) is provided at the top of the mounting main rod (101). A thread is provided on the outside of the interface (402).

8. The auxiliary purse-string suture device for peritoneal dialysis catheter placement according to claim 7, characterized in that: An airbag (401) is provided on the bottom side of the mounting main rod (101). The airbag (401) is hollow. A connecting hole (405) is provided inside the buffer air chamber (403). The connecting hole (405) passes through the buffer air chamber (403) and the side wall of the airbag (401). The interior of the airbag (401) and the buffer air chamber (403) are connected through the connecting hole (405).

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