Arteriovenous vascular indwelling device

Abstract

The present invention specifically discloses an arteriovenous vascular indwelling device, which includes an indwelling device body retained inside a blood vessel, and a catheter seat integrally provided with the indwelling device body. The catheter seat is located outside the skin. A guiding channel inside the catheter seat is communicated with the inner cavity of the indwelling device body. An inlet and outlet is arranged on the side wall of the catheter seat and is communicated with a connecting tube through the inlet and outlet. An isolation plug is arranged at the end of the connecting tube; a raised part is arranged at the middle position of the indwelling device body, an opening is arranged on the raised part, the opening is communicated with the guiding channel inside the catheter seat, and a shielding ring plate is arranged at the opening; a partition plate is arranged in the guiding channel, the partition plate is located above the liquid outlet, an adjusting sleeve is arranged above the partition plate, a guiding rod is threadedly connected inside the adjusting sleeve, the lower end of the guiding rod penetrates through the partition plate and enters the inner cavity of the indwelling device body, and a clamping block is fixedly connected to the end thereof. The upper end of the adjusting sleeve is fixedly connected with an adjusting seat.

Description

Technical Field

[0001] The invention belongs to the technical field of medical instruments, and in particular relates to an arteriovenous indwelling device. Background Art

[0002] In clinical treatment, arteriovenous puncture needles are widely used in hemodialysis. Hemodialysis often uses traditional metal puncture needles to puncture arteriovenous vessels and fix them for dialysis treatment. This metal puncture needle is only used for one hemodialysis and causes great damage to blood vessels. During the treatment process, the metal puncture needle remains in the blood vessel and is easy to stick to the inner wall of the blood vessel, affecting blood flow and causing bleeding at the puncture site.

[0003] During the hemodialysis process, the patient's puncture arm must not move, which causes many inconveniences to the patient and poor patient comfort. Generally, patients with renal failure need hemodialysis 2-3 times a week. Repeated punctures with metal puncture needles will inevitably damage the patient's blood vessels, causing pain to the patient and making the workload of clinical nurses more onerous. Because arteries are relatively small, punctures are difficult. In order to facilitate arterial puncture, arteriovenous fistulas are currently constructed clinically. However, with repeated punctures, the arteriovenous fistula continues to grow and move toward the proximal end. In order to solve the problem of arterial puncture, this arteriovenous vascular indwelling device was specially invented. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides an arteriovenous indwelling device, which can be placed in the artery and vein of the upper limb of a person and used in conjunction with the existing arterial tube for hemodialysis. It can achieve the purpose of indwelling, avoid repeated punctures, relieve the pain of patients, and prevent blood extravasation, thereby achieving safe indwelling and being safe and reliable to use.

[0005] The technical solution adopted by the present invention is:

[0006] An arteriovenous indwelling device comprises an indwelling device body indwelled in a blood vessel, and a catheter seat integrally arranged with the indwelling device body, wherein the catheter seat is located outside the skin, the guide cavity inside the catheter seat is connected with the inner cavity of the indwelling device body, the side wall of the catheter seat is provided with a liquid inlet and outlet, and is connected with a connecting tube through the liquid inlet and outlet, and an isolation plug is provided at the end of the connecting tube;

[0007] A raised portion is provided in the middle of the retention device body, an opening is provided on the raised portion, the opening is communicated with the guide cavity inside the catheter seat, and a shielding ring disk is provided at the opening;

[0008] A partition is arranged in the guiding channel. The partition is located above the liquid inlet and outlet. An adjusting sleeve is arranged above the partition. A guiding rod is threadedly connected inside the adjusting sleeve. The lower end of the guiding rod penetrates through a perforation on the partition and enters the inner cavity of the indwelling device body. The end of the guiding rod is fixedly connected with a clamping block. The clamping block can hermetically block the inner ring of the ring disc. The upper end of the adjusting sleeve is fixedly connected with an adjusting seat. The adjusting seat is located above the catheter seat and seals the port of the catheter seat.

[0009] Preferably, the guiding rod includes a threaded section and a smooth section. The threaded section is located inside the adjusting sleeve, and its diameter is larger than that of the smooth section. Symmetrically arranged ridges are provided on the outer periphery of the smooth section. Sliding grooves matching with the ridges are provided on the inner wall of the perforation. The sliding grooves penetrate through the upper and lower end faces of the inner wall.

[0010] Preferably, a limiting cylinder is arranged on the upper end face of the partition around the outside of the adjusting sleeve. A horizontal ring plate is arranged along the circumferential direction at the upper end of the limiting cylinder. An annular groove is provided on the outer wall of the adjusting sleeve. The horizontal ring plate is located in the annular groove. A buffer assembly is arranged between the horizontal ring plate and the upper and lower walls of the annular groove.

[0011] Preferably, the buffer assembly includes a compression spring and a ball. A plurality of symmetrically arranged mounting grooves at equal intervals are provided along the circumferential direction on the upper and lower end faces of the horizontal ring plate. A communicating connection hole is provided between two symmetrically arranged mounting grooves on the upper and lower sides. The compression spring is installed in the mounting groove. Part of the compression spring is located in the connection hole. The compression spring is located in the connection hole and sleeved outside the part of the ball located in the connection hole.

[0012] Preferably, a locking assembly is arranged between the adjusting seat and the catheter seat. The locking assembly includes an L-shaped locking piece. A support seat is arranged on the upper end outer wall of the catheter seat. The vertical part of the L-shaped locking piece penetrates through the support seat, and the end of the vertical part of the L-shaped locking piece is a mushroom head structure. At least two accommodating grooves with openings facing downwards are provided on the lower end face of the adjusting seat. Inner holes are provided on the two symmetric side walls of the accommodating groove. Both of the inner holes communicate with the accommodating groove through a fan-shaped opening. Limiting pieces are arranged in both of the inner holes. The middle part of the limiting piece penetrates through the fan-shaped opening and bends into a convex part inside the accommodating groove. After the L-shaped locking piece is inserted into the accommodating groove, the convex part is stuck below the mushroom head structure.

[0013] Preferably, a plurality of compression springs are further arranged at the inner bottom of the inner hole. The upper ends of the plurality of compression springs are all connected with the lower end of the limiting piece. The lower ends of the plurality of compression springs are all fixedly connected with the inner bottom of the inner hole. The plurality of compression springs are evenly distributed along the width direction of the limiting piece.

[0014] Preferably, a first conical adjacent surface, a first outer table surface and a second outer table surface are sequentially arranged on the outer side wall of the clamping block from bottom to top. A second conical adjacent surface and an inner table surface are sequentially arranged on the inner ring wall of the shielding ring plate from bottom to top. When the clamping block is embedded into the inside of the shielding ring plate, the first conical adjacent surface is adjacent to the second conical adjacent surface, the first outer table surface is attached to the inner table surface, and the second outer table surface is attached to the top wall of the shielding ring plate.

[0015] Preferably, a conical ring is further arranged on the outer wall of the second outer table surface along its circumferential direction. The conical ring is at the same height as the second outer table surface. A sealing groove matched with the conical ring is arranged on the top wall of the shielding ring plate. When the clamping block is embedded into the inside of the shielding ring plate, the conical ring is limited in the sealing groove.

[0016] Preferably, the outer wall of the shielding ring plate and the inner wall of the raised part are integrally formed.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1) The arteriovenous vascular indwelling device of the present invention is used to replace the arterial puncture during conventional hemodialysis. The middle part thereof is designed as a raised part for dilating blood vessels and playing a fixing role. An opening is arranged on the raised part. The opening is communicated with the guiding channel inside the catheter seat. A shielding ring plate is arranged at the opening. The inner ring of the shielding ring plate forms a valve seat. A plug body structure composed of an adjusting seat, an adjusting sleeve, a guiding rod and a clamping block. By rotating the adjusting seat, the guiding rod is guided to move up and down, changing the relative position of the clamping block, so as to realize the cooperation between the clamping block and the shielding ring plate for conducting and closing the blood flow inside the indwelling device, thereby avoiding the phenomenon of repeated puncture of blood vessels by the puncture needle tube, and the whole device has good sealing performance. When hemodialysis is not required, during the process of the guiding rod moving downward, the clamping block is closely attached to the inner ring wall of the shielding ring plate, so as to prevent the blood inside the indwelling device from flowing into the inner cavity of the catheter seat and causing pollution; when communicating with the arterial connecting tube, the guiding rod moves upward, the clamping block moves upward along with the guiding rod, and its upper end abuts against the lower end surface of the partition plate, sealing the perforation on the partition plate and changing the blood flow direction. The whole structure is simple to operate and convenient to use.

[0019] 2) The indwelling device of the present invention can be indwelled in blood vessels to achieve the indwelling purpose, and there is no need to insert and pull out the puncture needle tube multiple times, reducing the pain of patients; it is connected with the arterial connecting tube of the current hemodialysis in a supporting manner for hemodialysis. Its operation is simple, reducing the multiple injuries caused by the traditional puncture arteriovenous puncture needle to patients, and it is safe and reliable to use. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 The cross-sectional view of an arteriovenous vascular indwelling device provided in Embodiment 1 as shown.

[0022] Figure 2 For Figure 1 The schematic diagram after deformation (during hemodialysis).

[0023] Figure 3 The schematic diagram of the plug structure composed of the adjustment seat, adjustment sleeve, guide rod and block in Embodiment 1.

[0024] Figure 4 For Figure 1 The enlarged view of part A in

[0025] Figure 5 For Figure 4 The partial structure diagram in

[0026] Figure 6 For Figure 1 The enlarged view of part B in

[0027] Figure 7 For Figure 6 The partial structure diagram of the limit sleeve in

[0028] Figure 8 The cross-sectional view of an arteriovenous vascular indwelling device provided in Embodiment 2 as shown.

[0029] Figure 9 As shown Figure 8 The schematic diagram after deformation (during hemodialysis).

[0030] Figure 10 The schematic diagram of the plug structure composed of the adjustment seat, adjustment sleeve, guide rod and block in Embodiment 2.

[0031] Among them, 1. The indwelling device body; 101. The raised part; 102. The blocking ring plate; 2. The catheter seat; 201. The guiding channel; 202. The liquid outlet; 203. The partition plate; 3. The connecting pipe; 4. The clamping block; 401. The first conical adjacent surface; 402. The first outer table surface; 403. The second outer table surface; 404. The conical ring; 5. The guiding rod; 501. The threaded section; 502. The smooth section; 503. The rib; 6. The adjusting sleeve; 601. The annular groove; 7. The limiting cylinder; 701. The horizontal ring plate; 702. The installation groove; 703. The connecting hole; 704. The ball; 705. The compression spring; 8. The adjusting seat; 9. The locking assembly; 901. The L-shaped locking part; 902. The accommodating groove; 903. The inner hole; 904. The fan-shaped opening; 905. The limiting piece; 906. The extrusion spring; 10. The isolation plug; 11. The second conical adjacent surface; 12. The inner table surface; 13. The sealing groove. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] This embodiment discloses an arteriovenous vascular indwelling device, as Figure 1-2 shown, including an indwelling device body 1 retained inside the blood vessel and a catheter seat 2 integrally provided with the indwelling device body 1. The arrow direction in the figure is the blood flow direction.

[0036] Specifically, the catheter seat 2 is located outside the skin. The guiding channel 201 inside the catheter seat 2 is communicated with the inner cavity of the indwelling device body 1. A liquid outlet 202 is provided on the side wall of the catheter seat 2 and is communicated with the connecting pipe 3 through the liquid outlet 202. An isolation plug 10 is provided at the end of the connecting pipe 3. When hemodialysis is not performed, the isolation plug 10 is arranged at the free end of the connecting pipe 3 to prevent blockage of the connecting pipe 3 and avoid pollution of the internal environment of the connecting pipe 3.

[0037] Again, as Figure 1As shown, the indwelling device body 1 is embedded in the blood vessel along the blood flow direction. An anticoagulant material that can be placed in the body for a long time can be used. For example, a PICC tube is used. The PICC tube is immersed in a solution containing zwitterionic polymer sulfobetaine (PolySB) and reacted for at least 16 hours, so as to modify the inner and outer surfaces of the PICC, and finally an indwelling device with anticoagulant function is obtained. Since PolySB has good oxidation stability and hydrophilicity, it is very suitable for long-term application. In this embodiment, when the indwelling tube body and the outer wall of the catheter seat are produced, the same material can be used to achieve integral molding, and the above-mentioned anticoagulant coating treatment is also carried out.

[0038] A raised portion is provided at the middle position of the indwelling device body. The raised portion can achieve the purpose of dilating the blood vessel and avoid the situation that the indwelling device body moves in the blood vessel. Blood flows along the length direction of the indwelling device body 1 in the inner cavity of the indwelling device body 1. An opening is provided on the raised portion 101. The opening is communicated with the guiding cavity 201 inside the catheter seat 2, and a shielding ring plate 102 is provided at the opening. The outer wall of the shielding ring plate 102 is integrally formed with the inner wall of the raised portion, and the area of the clamping block is 2 / 3 of the area of the shielding ring plate 102. The inner wall of the inner channel formed by the clamping block, the shielding ring plate 102 and the raised portion is smooth and unobstructed, ensuring the smoothness of blood flow. When the clamping block moves upward and leaves the shielding ring plate 102, about 1 / 3 of the blood flowing out of the indwelling tube can be blocked by the shielding ring plate 102.

[0039] Another example is Figure 3 As shown, a partition plate 203 is provided in the guiding cavity 201. The partition plate 203 is located above the liquid outlet 202. An adjusting sleeve 6 is provided above the partition plate 203. A guiding rod 5 is threadedly connected inside the adjusting sleeve 6. The lower end of the guiding rod 5 passes through the perforation on the partition plate 203 and enters the inner cavity of the indwelling device body 1, and a clamping block 4 is fixedly connected to its end. The clamping block 4 can hermetically shield the inner ring of the shielding ring plate 102. The upper end of the adjusting sleeve 6 is fixedly connected with an adjusting seat 8. The adjusting seat 8 is located above the catheter seat 2 and seals the port of the catheter seat 2. Among them, the guiding rod 5 includes a threaded section 501 and a smooth section 502. The threaded section 501 is inside the adjusting sleeve 6, and its diameter is larger than the diameter of the smooth section 502. Symmetrically arranged convex strips 503 are provided on the outer periphery of the smooth section 502. A sliding groove (not shown in the figure) that cooperates with the convex strips 503 is provided on the inner wall of the perforation. The sliding groove penetrates the upper and lower end faces of the inner wall. When the adjusting seat 8 is rotated, the adjusting sleeve 6 rotates together with the adjusting seat 8, and the guiding rod 5 moves up and down in the vertical direction as the adjusting sleeve 6 rotates. Since the smooth section 502 is engaged with the sliding groove on the partition plate 203 through the convex strips 503, the situation that the guiding rod 5 rotates together with the adjusting sleeve 6 is avoided.

[0040] By rotating the adjustment seat 8, the guide rod 5 is guided to move up and down, changing the relative position of the clamping block 4, so that the clamping block 4 cooperates with the shielding ring plate 102 to conduct and close the blood flow inside the indwelling device, thereby avoiding the phenomenon of repeated puncture of the blood vessel by the puncture needle tube, and the whole device has good sealing performance. When hemodialysis is not required, the outer wall of the clamping block 4 is closely attached to the inner wall of the shielding ring plate 102, thereby preventing the blood inside the indwelling device from flowing into the inner cavity of the catheter seat 2 and causing pollution; when connected to the arterial adapter tube, the guide rod 5 moves upward, and the clamping block 4 moves upward along with the guide rod, and its upper end abuts against the lower end face of the partition plate 203, sealing the perforation on the partition plate 203, and the blood flows into the connecting tube 3 along the guide channel 201 and flows into the arterial connecting tube.

[0041] As Figure 1 , 2 , 6, and 7 show that a limiting cylinder 7 is arranged on the upper end surface of the partition plate 203 around the outer side of the adjusting sleeve 6. A horizontal ring plate 701 is arranged on the upper end of the limiting cylinder 7 along its circumferential direction. An annular groove 601 is arranged on the outer wall of the adjusting sleeve 6. The horizontal ring plate 701 is located in the annular groove 601, and a buffer assembly is arranged between the upper and lower walls of the horizontal ring plate 701 and the annular groove 601. The buffer assembly includes a compression spring 705 and a ball 704. A plurality of equally spaced and symmetrically arranged mounting grooves 702 are arranged on the upper and lower end surfaces of the horizontal ring plate 701 along its circumferential direction. A communicating connection hole 703 is arranged between the upper and lower symmetrically arranged mounting grooves 702. The compression spring 705 is installed in the mounting groove 702, a part of the compression spring 705 is located in the connection hole 703, and the compression spring 7056 is located in the connection hole 703 and sleeved on the outer side of the part of the ball 704 located in the connection hole 703.

[0042] In this embodiment, the horizontal ring plate 701 of the limiting cylinder 7 is stuck in the annular groove 601 of the adjusting sleeve 6 to seal and limit the adjusting sleeve 6, avoiding the random up and down movement or deviation of the adjusting sleeve 6, and at the same time avoiding the leakage of blood inside the indwelling device body 1. Secondly, the relative smooth sliding of the adjusting sleeve 6 and the horizontal ring plate 701 is realized through the buffer assembly.

[0043] As Figure 4 and 5As shown in the figure, in order to prevent the adjusting seat 8 from rotating under the action of external force, a locking component 9 is provided between the adjusting seat 8 and the catheter seat 2. The locking component 9 includes an L-shaped locking piece 901. A support seat is provided on the outer wall of the upper end of the catheter seat 2. The vertical part of the L-shaped locking piece 901 penetrates through the support seat, and the end of the vertical part of the L-shaped locking piece 901 is a mushroom head structure. At least two receiving grooves 902 with openings facing down are provided on the lower end surface of the adjusting seat 8. Inner holes 903 are provided on both symmetric side walls of the receiving groove 902. Both of the two inner holes 903 are communicated with the receiving groove 902 through a fan-shaped opening 904. Limiting pieces 905 are provided in both of the two inner holes 903. The middle part of the limiting piece 905 penetrates through the fan-shaped opening 904 and bends into a protruding part inside the receiving groove 902. After the L-shaped locking piece 901 is inserted into the receiving groove 902, the protruding part is stuck below the mushroom head structure.

[0044] A plurality of extrusion springs 906 are further provided at the inner bottom of the inner hole 903. The upper ends of the plurality of extrusion springs 906 are all connected to the lower end of the limiting piece 905. The lower ends of the plurality of extrusion springs 906 are all fixedly connected to the inner bottom of the inner hole 903. The plurality of extrusion springs 906 are equally spaced along the width direction of the limiting piece 905. Among them, the limiting piece 905 can be made of an elastic steel sheet.

[0045] When hemodialysis is not required, rotate the adjusting seat 8 to drive the adjusting sleeve 6 to rotate. Since the guide rod 5 is internally threaded with the adjusting sleeve 6, the guide rod 5 is driven to move downward. The clamping block 4 is closely attached to the shielding ring plate 102. Then, push the L-shaped locking piece 901 upward, and the mushroom head structure enters the receiving groove 902. First, it squeezes the limiting piece 905, causing the protruding part of the limiting piece 905 to retract inward. The lower end of the limiting piece 905 squeezes the extrusion spring 906 to move downward. After the mushroom head structure completely enters the upper inner part of the receiving groove 902, the limiting piece 905 is reset under the action of the extrusion spring 906, and the formed protruding part presses below the mushroom head structure to limit the mushroom head structure and prevent the adjusting seat 8 from rotating under the action of external force. When communicating with the arterial connection tube, the guide rod 5 moves upward, and the clamping block 4 moves upward along with the guide rod. The upper end of the clamping block 4 abuts against the lower end surface of the partition plate to seal the perforation on the partition plate. Approximately 2 / 3 of the blood flows along the guiding channel 201 into the connecting tube 3 and flows into the arterial connection tube. Similarly, push the L-shaped locking piece upward to limit the mushroom head structure in the receiving groove and prevent the adjusting seat from rotating under the action of external force.

[0046] During use, first disinfect the patient's skin, incise the skin to find the target artery, clamp the artery with a hemostat, make a small incision in the artery with a scalpel or surgical scissors at the distal end, and then implant the indwelling device body 1 into the artery. The catheter seat 2 and the connecting tube 3 are exposed outside the skin. Suture the artery and the skin, and thus the implantation of the indwelling device is completed. When hemodialysis is required for the patient, connect the arterial adapter to the indwelling device, rotate the adjustment seat 8 to drive the guide rod 5 to move upward. The clamping block 4 moves upward along with the guide rod, and its upper end abuts against the lower end face of the partition plate, sealing the perforation on the partition plate, improving the blood flow direction in the inner cavity of the indwelling device body 1. The blood flows into the connecting tube 3 along the guide channel and then flows into the arterial adapter, and then hemodialysis can begin. The whole device is simple to operate and has extremely high safety, avoiding the drawbacks of traditional repeated punctures.

[0047] Embodiment 2

[0048] On the basis of the structure disclosed in Embodiment 1, improve the structures of the clamping block and the matching shielding ring plate:

[0049] As Figure 8 、 9 、10 show, in this embodiment, the outer side wall of the clamping block is sequentially provided with a first conical adjacent surface, a first outer table surface and a second outer table surface from bottom to top. The outer wall of the second outer table surface is also provided with a conical ring along its circumferential direction. The conical ring is at the same height as the second outer table surface. The inner ring wall of the shielding ring plate is sequentially provided with a second conical adjacent surface and an inner table surface from bottom to top, and a sealing groove matching with the conical ring is arranged on the top wall of the shielding ring plate. When the clamping block is embedded inside the shielding ring plate, the first conical adjacent surface abuts against the second conical adjacent surface, the first outer table surface fits on the inner table surface, the second outer table surface fits on the top wall of the shielding ring plate, and the conical ring is limited in the sealing groove. The interaction of the cooperation between the first conical adjacent surface and the second conical adjacent surface, the cooperation between the first outer table surface and the inner table surface, the cooperation between the second outer table surface and the top wall of the shielding ring plate, and the conical ring being limited in the sealing groove realizes the sealing between the clamping block and the shielding ring plate. Thus, the sealing effect at the connection between the clamping block and the shielding ring plate is better and the degree of coincidence is higher, ensuring that the contact part between the bottom wall of the clamping block and the bottom wall of the shielding ring plate is smooth and flat, making the inner wall of the raised part in the middle position of the indwelling device body smooth and unobstructed.

[0050] In use, first disinfect the patient's skin, cut through the skin to find the target artery, clamp the artery with a hemostat, make a small incision in the artery with a scalpel or surgical scissors at the distal end, and then implant the indwelling device body 1 into the artery. The catheter seat 2 and the connecting tube 3 are exposed outside the skin. Suture the artery and the skin, and thus the implantation of the indwelling device is completed. When hemodialysis is required for the patient, connect the arterial connecting tube to the indwelling device, rotate the adjustment seat 8 to drive the guide rod 5 to move upward. The clamping block 4 moves upward along with the guide rod, and its upper end abuts against the lower end face of the partition plate, sealing the perforation on the partition plate, improving the blood flow direction in the inner cavity of the indwelling device body 1. The blood flows into the connecting tube 3 along the guide channel and flows into the arterial connecting tube, and then hemodialysis can begin. After dialysis, rotate the adjustment seat 8 in the reverse direction, the zither sound guide rod moves downward, and the clamping block moves downward along with the guide rod. When the clamping block is embedded inside the shielding ring plate, the first conical adjacent surface abuts against the second conical adjacent surface to achieve good anastomosis. The first outer table surface fits on the inner table surface, the second outer table surface fits on the top wall of the shielding ring plate, and the conical ring is limited in the sealing groove. The clamping block and the shielding ring plate achieve good sealing, so as to ensure that the contact part between the bottom wall of the clamping block and the bottom wall of the shielding ring plate is smooth and flat, making the inner wall of the raised part in the middle position of the indwelling device body smooth and unobstructed.

[0051] In the above embodiments, the structures involved are all made of medical materials with anticoagulant effects. Among them, structures such as the indwelling device body 1, the guide rod 5, the clamping block 4, the partition plate 203, the adjustment sleeve 6, the adjustment seat 8, and the shielding ring plate can all be made of metal materials (titanium alloy materials, medical stent materials), medical polymer materials, etc. For the connecting tube, in addition to using the above-mentioned metals and medical polymer materials with good anticoagulant effects, polytetrafluoroethylene tubes or e-PTFE artificial blood vessels can also be used.

[0052] The operation method of the venous blood vessel placement tube is similar to the above description of the artery, and will not be elaborated here.

[0053] In addition to being used for the above-mentioned hemodialysis, the arteriovenous blood vessel indwelling device of the present invention can also be used to construct an allogeneic co-circulation model for medical research.

[0054] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the present invention, especially the joint design with both inlet and outlet on the side wall. Any simple modification, change, and equivalent change made to the above embodiments according to the technical essence of the invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. Arteriovenous vascular indwelling device, characterized in that, It includes an indwelling device body retained inside the blood vessel and a catheter seat integrally provided with the indwelling device body. The catheter seat is located outside the skin. The guiding channel inside the catheter seat is communicated with the inner cavity of the indwelling device body. An inlet / outlet is provided on the side wall of the catheter seat and is communicated with a connecting tube through the inlet / outlet. An isolation plug is provided at the end of the connecting tube. A raised portion is provided at the middle position of the indwelling device body. An opening is provided on the raised portion. The opening is communicated with the guiding channel inside the catheter seat, and a shielding ring plate is provided at the opening. A partition is provided in the guiding channel. The partition is located above the inlet / outlet. An adjusting sleeve is provided above the partition. A guiding rod is threadedly connected inside the adjusting sleeve. The lower end of the guiding rod penetrates through the perforation on the partition and enters the inner cavity of the indwelling device body. A clamping block is fixedly connected to its end. The clamping block can hermetically shield the inner ring of the shielding ring plate. The upper end of the adjusting sleeve is fixedly connected with an adjusting seat. The adjusting seat is located above the catheter seat and seals the port of the catheter seat.

2. The arteriovenous vascular indwelling device according to claim 1, characterized in that, The guiding rod includes a threaded section and a smooth section. The threaded section is located inside the adjusting sleeve, and its diameter is larger than that of the smooth section. Symmetrically arranged convex strips are provided on the outer periphery of the smooth section. Sliding grooves matching with the convex strips are provided on the inner wall of the perforation. The sliding grooves penetrate through the upper and lower end faces of the inner wall.

3. The arteriovenous vascular indwelling device according to claim 2, characterized in that, A limiting cylinder is provided on the upper end face of the partition around the outside of the adjusting sleeve. A horizontal ring plate is provided on the upper end of the limiting cylinder along its circumferential direction. An annular groove is provided on the outer wall of the adjusting sleeve. The horizontal ring plate is located in the annular groove. A buffer assembly is provided between the horizontal ring plate and the upper and lower walls of the annular groove.

4. The arteriovenous vascular indwelling device according to claim 3, characterized in that, The buffer assembly includes a compression spring and a ball. A plurality of symmetrically arranged mounting grooves at equal intervals along its circumferential direction are provided on the upper and lower end faces of the horizontal ring plate. A communicating connection hole is provided between two symmetrically arranged mounting grooves. The compression spring is installed in the mounting groove. Part of the compression spring is located in the connection hole. The compression spring is located in the connection hole and sleeved outside the part of the ball located in the connection hole.

5. The arteriovenous vascular indwelling device according to claim 2, characterized in that, A locking assembly is provided between the adjusting seat and the catheter seat. The locking assembly includes an L-shaped locking piece. A support is provided on the upper outer wall of the catheter seat. The vertical part of the L-shaped locking piece penetrates through the support, and the end of the vertical part of the L-shaped locking piece is a mushroom head structure. At least two accommodation grooves opening downward are provided on the lower end face of the adjusting seat. Inner holes are provided on the two symmetric side walls of the accommodation groove. Both of the two inner holes are communicated with the accommodation groove through a fan-shaped opening. Limiting pieces are provided in both of the two inner holes. The middle part of the limiting piece penetrates through the fan-shaped opening and bends into a raised portion inside the accommodation groove. After the L-shaped locking piece is inserted into the accommodation groove, the raised portion is stuck below the mushroom head structure.

6. The arteriovenous indwelling device according to claim 5, wherein, A plurality of compression springs are further provided at the inner bottom of the inner hole. The upper ends of the plurality of compression springs are all connected to the lower end of the limiting piece. The lower ends of the plurality of compression springs are all fixedly connected to the inner bottom of the inner hole. The plurality of compression springs are equally spaced along the width direction of the limiting piece.

7. The arteriovenous indwelling device according to claim 1, characterized in that, The outer side wall of the clamping block is successively provided with a first conical adjacent surface, a first outer table surface and a second outer table surface from bottom to top. The inner ring wall of the shielding ring plate is successively provided with a second conical adjacent surface and an inner table surface from bottom to top. When the clamping block is embedded inside the shielding ring plate, the first conical adjacent surface is adjacent to the second conical adjacent surface, the first outer table surface is attached to the inner table surface, and the second outer table surface is attached to the top wall of the shielding ring plate.

8. The arteriovenous vascular indwelling device according to claim 7, wherein, The outer wall of the second outer table surface is further provided with a conical ring along its circumferential direction. The conical ring is at the same height as the second outer table surface. A sealing groove matching with the conical ring is arranged on the top wall of the shielding ring plate. When the clamping block is embedded inside the shielding ring plate, the conical ring is limited in the sealing groove.

9. The arteriovenous vascular indwelling device according to claim 1, wherein The outer wall of the shielding ring plate and the inner wall of the raised part are integrally formed.

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