CN119564963A - Dialysis catheter - Google Patents
Dialysis catheter Download PDFInfo
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- CN119564963A CN119564963A CN202411774120.7A CN202411774120A CN119564963A CN 119564963 A CN119564963 A CN 119564963A CN 202411774120 A CN202411774120 A CN 202411774120A CN 119564963 A CN119564963 A CN 119564963A
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- catheter
- dialysis
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- auxiliary
- supporting ring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
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- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Urology & Nephrology (AREA)
- Anesthesiology (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Emergency Medicine (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
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- Public Health (AREA)
- Veterinary Medicine (AREA)
- External Artificial Organs (AREA)
Abstract
The application belongs to the field of medical catheter instruments, and particularly relates to a dialysis catheter. The catheter comprises a catheter body extending along the longitudinal direction, at least two auxiliary catheters, a base and a plurality of auxiliary catheters, wherein the catheter body comprises a distal end, the at least two auxiliary catheters are communicated with the proximal end of the catheter body, inner cavities which are respectively and correspondingly communicated with the auxiliary catheters are arranged in the catheter body, side holes which are corresponding to the distal ends of the plurality of inner cavities are formed in the inner cavities, and the base is connected to the proximal end of the auxiliary catheters and is communicated with the connected auxiliary catheters. The whole dialysis catheter is buried under the skin, the puncture medical instrument has small wound on the skin and is easy to recover, the risk of infection is greatly reduced, the base is not exposed outside the body and is relatively stable in connection with the skin, the risk of being pulled out accidentally is avoided, and the influence on the life of a patient is also remarkably reduced. In addition, the sterile liquid can be injected into the dialysis catheter through the side hole, so that the catheter can not be tightly attached to the vena cava, the probability of thrombosis is reduced, and the dialysis catheter has the advantages of difficulty in infection, small influence on life and friendliness to patients.
Description
Technical Field
The application belongs to the field of medical catheter instruments, and particularly relates to a dialysis catheter.
Background
Dialysis catheters are mainly used for renal failure or other patients requiring blood purification treatment. Through hemodialysis catheter, can draw patient's blood out of the body, after the filtration and the purification of dialyzer, reinfusion blood to patient's body to help the patient to get rid of metabolic waste and unnecessary moisture in the body.
The base of the existing dialysis catheter is exposed on the surface of the skin for a long time, on one hand, a patient needs to take special care in daily life, particularly in bath, so that bath water is prevented from contacting the base, and further infection risks possibly caused by moisture infiltration into the body are avoided, the restriction not only increases psychological burden of the patient, but also obviously influences the life quality of the patient, on the other hand, the skin around the base cannot heal, the base exposed for a long time is easy to become a warm bed for bacteria to grow, the infection risks are increased, the connection between the base and the skin is not stable enough, the risk of being pulled out accidentally exists, the damage to the base is easy, and the break of the dialysis process is possibly caused, and additional pain and discomfort are brought to the patient.
In summary, the existing dialysis catheter has significant problems of easy infection, large influence on life and the like in the practical process. To solve the above problems, more advanced and humanized dialysis catheter designs are sought to improve patient comfort and safety while reducing their burden in daily life.
Disclosure of Invention
The application aims to provide a humanized dialysis catheter which is not easy to infect and has little influence on life.
The embodiment of the application can be realized by the following technical scheme:
A dialysis catheter, comprising a catheter extending along the longitudinal direction, wherein the catheter comprises a catheter body at the distal end and at least two auxiliary catheters communicated with the proximal end of the catheter body, the catheter body is internally provided with inner cavities respectively communicated with the auxiliary catheters, and side holes corresponding to the distal ends of a plurality of inner cavities are formed in the catheter body;
The device also comprises a base, wherein the base is connected to the proximal end of the auxiliary catheter and is communicated with the auxiliary catheter, the side wall and the end face of the base are of arc structures, and the base is connected with an external hemodialysis machine.
Further, the base is of a cap-shaped structure with one end open and one end closed, and the open end is connected with the silica gel diaphragm in a matched mode.
Preferably, the device further comprises locking mechanisms corresponding to the auxiliary catheters one by one, protruding portions are arranged on the outer sides of the bases, the protruding portions are of tubular structures, the locking mechanisms are sleeved on the peripheries of the auxiliary catheters and the protruding portions, and the auxiliary catheters are tightly held and connected with the protruding portions.
Further, the locking mechanism comprises a supporting ring and a lock catch, the supporting ring can be wrapped to form a non-closed cylindrical structure, the lock catch is connected to one end of the movable end of the supporting ring, and the other end of the supporting ring is in locking connection with the lock catch.
Further, the supporting ring comprises a supporting ring body and an expansion part, wherein one end of the supporting ring body along the wrapping direction of the supporting ring body is connected with the lock catch, the other end of the supporting ring body is connected with the expansion part, and the other end of the expansion part is in locking connection with the lock catch;
The width of the expansion part along the longitudinal extension direction of the auxiliary conduit is smaller than the width of the supporting ring body along the longitudinal extension direction of the auxiliary conduit.
Preferably, the catheter further comprises a clamp, wherein the clamp is sleeved and connected to the periphery of the catheter body, and the clamp corresponds to the position of the collarbone.
Further, the clip is made of at least one metal alloy or fiber material of stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy, and noble metal alloy.
Further, the catheter body is made of at least one material selected from silicone rubber, polyurethane, polyvinyl chloride, polyethylene, polypropylene and polytetrafluoroethylene materials, and the distal end of the catheter body is in a sharp inclined surface structure.
Further, the number of the secondary ducts is two.
Further, the base is made of at least one metal alloy of stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy, and noble metal alloy.
The dialysis catheter provided by the embodiment of the application has at least the following beneficial effects:
The whole dialysis catheter is buried under the skin, the puncture medical instrument has small wound on the skin and is easy to recover, the risk of infection is greatly reduced, the base is not exposed outside the body and is relatively stable in connection with the skin, the risk of being pulled out accidentally is avoided, and the influence on the life of a patient is also remarkably reduced. In addition, the dialysis catheter can be injected with sterile liquid through the side hole, so that the catheter can not be tightly attached to the vena cava, the probability of thrombosis is reduced, and the dialysis catheter has the advantages of difficulty in infection, small influence on life and friendliness to patients;
The dialysis catheter of the present application is configured with a clip corresponding to the location of the collarbone. Because the clamp is foreign relative to the collarbone, the collarbone can form a layer of tissue sheath through self immune reaction to wrap the clamp, thereby fixing the clamp position, and ensuring the connection stability of the dialysis catheter in the human body together with the base;
The base, the lock catch and the locking mechanism are all made of metal alloy with excellent biocompatibility, mechanical property and corrosion resistance, so that the support stability among devices is ensured, dissolution in a body is avoided, and the service life of the dialysis catheter is prolonged;
The distal end of the catheter body is of a sharp inclined surface structure, and the distal end of the catheter is characterized by gradual change, so that the catheter can be smoothly guided into a target position in the implantation process. In particular, when a narrow or curved passage is required, resistance can be reduced and the success rate of insertion can be improved.
Drawings
FIG. 1 is a general construction view of a dialysis catheter according to the present application;
FIG. 2 is an exploded view of a dialysis catheter of the present application;
FIG. 3 is an overall block diagram of a base in the present application;
fig. 4 is an overall construction diagram of the shackle in the present application.
Reference numerals 1, conduit 11, conduit body 12, auxiliary conduit 13, side hole 2, base 3, clip 4, locking mechanism 41, supporting ring 411, supporting ring body 412, expansion part 42, and lock catch.
Detailed Description
The present application will be further described below based on preferred embodiments with reference to the accompanying drawings.
The terminology used in the description presented herein is for the purpose of describing embodiments of the application and is not intended to be limiting of the application. Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, directly connected, indirectly connected via an intermediary, or in communication between two elements. The specific meaning of the above terms in the present application will be specifically understood by those skilled in the art.
In addition, in the description of the embodiments of the present application, various components on the drawings are enlarged or reduced for the convenience of understanding, but this is not intended to limit the scope of the present application.
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the application more clear, the technical scheme of the application is further described below by a specific embodiment in combination with the attached drawings. For convenience of description, the following description uses the terms "proximal" and "distal," where "proximal" refers to the end proximal to the operator and "distal" refers to the end distal to the operator and deeper into the vessel.
The application provides a dialysis catheter, as shown in fig. 1 and 2, the dialysis catheter comprises a catheter 1 extending along the longitudinal direction, the catheter 1 comprises a catheter body 11 at the distal end and at least two auxiliary catheters 12 communicated with the proximal end of the catheter body 11, inner cavities respectively communicated with the auxiliary catheters 12 are arranged in the catheter body 11, side holes 13 corresponding to the distal ends of a plurality of inner cavities are arranged on the side wall of the catheter body 11, the dialysis catheter further comprises a base 2, and the base 2 is connected with the proximal end of the auxiliary catheters 12 and communicated with the correspondingly connected auxiliary catheters 12. When the dialysis catheter is used, the whole dialysis catheter is buried under the skin, the side hole 13 at the far end is communicated with a blood vessel of a human body, the base 2 at the near end is connected with an external hemodialysis machine through a puncture medical instrument, the base 2 is a foreign body relative to the human body, and the inner side of the skin can form a layer of tissue sheath through self immune reaction to wrap the base 2, so that the position of the base 2 is fixed, and the connection stability of the dialysis catheter in the human body is guaranteed. The whole dialysis catheter is buried under the skin, the puncture medical instrument has small wound on the skin and is easy to recover, the risk of infection is greatly reduced, the base 2 is not exposed outside the body and is relatively stable in connection with the skin, the risk of being pulled out accidentally is avoided, and the influence on the life of a patient is also remarkably reduced. In addition, the dialysis catheter can be filled with sterile liquid through the side hole 13, so that the catheter 1 does not cling to the superior vena cava, and the probability of thrombosis is reduced.
Further, as shown in fig. 3, the base 2 is of a cap-shaped structure with one end open and one end closed, the periphery of the open end is provided with external threads, the cap-shaped structure can be matched and connected with a silica gel membrane, puncture equipment such as a butterfly needle can puncture the silica gel membrane and is communicated with the inside of the base 2, so that blood flows outwards only through the butterfly needle, the wound surface is small, and the operation is simple. In addition, after the dialysis is finished, the butterfly needle is taken away, the self elasticity of the silica gel diaphragm is large, a channel formed by puncturing the butterfly needle can be closed under the self elasticity, the bleeding amount and the recovery time of a patient are reduced, and the pain of the patient is reduced.
In some preferred embodiments of the present application, the side wall and the end face of the base 2 are arc structures, so that the base can be completely and smoothly attached to the skin, and the risk of cutting tissues at the edge of the base 2 is reduced.
In some specific embodiments of the present application, the base 2 is made of at least one metal alloy of stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy and noble metal alloy, and has excellent biocompatibility, mechanical properties and corrosion resistance, so that the stability of support is ensured, and the service life of the dialysis catheter is prolonged.
In other embodiments of the present application, the base 2 may also be made of a fibrous material, which is lightweight, high strength, good biocompatibility, low cost, easy to process and mold, excellent X-ray transmission, good electrical conductivity, and corrosion resistance.
Further, the side wall of the base 2 is provided with a through hole aligned with the auxiliary duct 12, and the base 2 forms a communicating pipeline with the auxiliary duct 12 through the through hole of the side wall. The base 2 is communicated with the secondary duct 12 by means of gluing, welding, setting a connecting structure, etc., and no matter what way the base 2 is connected, the stable connection of the base 2 and the secondary duct 12 can be realized.
In some preferred embodiments of the present application, as shown in fig. 1 and 2, to achieve stable connection between the base 2 and the secondary catheter 12, the dialysis catheter further includes a locking mechanism 4 corresponding to the secondary catheter 12 one by one, a protruding portion is disposed on the outer side of the base 2, the protruding portion is in a tubular structure and extends into an inner cavity of the proximal end of the secondary catheter 12, the locking mechanism 4 is sleeved on the outer peripheries of the secondary catheter 12 and the protruding portion, and the locking mechanism 4 tightly holds the proximal end of the secondary catheter 12 with the protruding portion to prevent the base 2 from being removed from the secondary catheter 12.
Specifically, the locking mechanism 4 extends in the longitudinal direction of the secondary catheter 12.
Further, as shown in fig. 4, the locking mechanism 4 includes a supporting ring 41 and a lock catch 42, the supporting ring 41 can be wrapped to form a non-closed cylindrical structure, the lock catch 42 is connected to one end of the movable end of the supporting ring 41, and the other end of the movable end of the supporting ring 41 is in locking connection with the lock catch 42. The supporting ring 41 is locked and connected with the lock catch 42 to realize the clasping connection with the auxiliary conduit 12 and the protruding part.
In some preferred embodiments of the present application, the supporting ring 41 includes a supporting ring body 411 and an expansion portion 412, wherein the width of the expansion portion 412 along the longitudinal extension direction of the secondary conduit 12 is smaller than the width of the supporting ring body 411 along the longitudinal extension direction of the secondary conduit 12, one end of the supporting ring body 411 along the wrapping direction is connected to the latch 42, the other end is connected to the expansion portion 412, and the other end of the expansion portion 412 is in locking connection with the latch 42. On the one hand, the expanding part 412 is in locking connection with the supporting ring body 411 through the lock catch 42, so that the holding effect is stable and reliable, and on the other hand, the longitudinal unit coverage area of the expanding part 412 is smaller than that of the supporting ring body 411, so that the weight of the locking mechanism 4 can be reduced, and the burden on a patient can be reduced.
In some embodiments of the present application, the number of the expansion portions 412 is one or more, and the number of the expansion portions 412 may be set based on actual requirements.
In some preferred embodiments of the present application, the locking buckle 42 is adapted to slidably snap-fit the extension 412 by means of a saw tooth arrangement to provide a locking connection with the extension 412, the outer diameter of the cavity formed by the ring 41 being adjustable to accommodate clasping of sub-conduits 12 of different outer diameters.
In some specific embodiments of the present application, the locking mechanism 4 is made of at least one metal alloy selected from stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy and noble metal alloy, and has excellent biocompatibility, mechanical properties and corrosion resistance, so that the support stability of the connection between the secondary catheter 12 and the protruding part is ensured, and the secondary catheter is prevented from being dissolved in the body, thereby further prolonging the service life of the dialysis catheter.
In some preferred embodiments of the application, as shown in fig. 1 and 2, the dialysis catheter further comprises a clip 3, the clip 3 being attached around the outer circumference of the catheter body 11, the clip 3 corresponding to the position of the collarbone. Because the clamp 3 is foreign body relative to the collarbone, the collarbone can form a layer of tissue sheath through self immune reaction to wrap the clamp 3, thereby forming the fixation of the clamp 3 position and ensuring the connection stability of the dialysis catheter in the human body together with the base 2.
In some preferred embodiments of the application, the clip 3 is made of at least one metal alloy of stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy and noble metal alloy, has excellent biocompatibility, mechanical properties and corrosion resistance, ensures the support stability of the connection with the collarbone, prevents dissolution in the body, and further prolongs the service life of the dialysis catheter.
In some specific embodiments of the present application, catheter 1 is made of at least one of silicone rubber, polyurethane, polyvinyl chloride, polyethylene, polypropylene, polytetrafluoroethylene materials. The catheter made of the materials has good adaptability and flexibility, can be easily adapted to various curved and narrow channels in a human body, can accurately reach focus positions and carry out accurate treatment, thereby improving the success rate and the safety of surgery, and can also reduce the damage and the stimulation in the intubation process, thereby reducing the risk of infection and improving the treatment effect and the safety of patients.
In some preferred embodiments of the present application, since the catheter 1 is generally soft, there is a problem of being flexible and hit during the implantation process, and the difficulty of implantation is increased, as shown in fig. 1 and 2, the distal end of the catheter body 11 in the present application has a sharp slope structure, and the distal end of the catheter 1 has a gradually changing characteristic, so as to facilitate the catheter 1 to be more smoothly guided into the target position during the implantation process. In particular, when a narrow or curved passage is required, resistance can be reduced and the success rate of insertion can be improved.
In some embodiments of the application, the number of secondary ducts 12 is two or three. When the number of the auxiliary catheters 12 is three, two of the side holes 13 are respectively connected with the arterial blood vessel and the venous blood vessel of the patient, and the two side holes 13 are respectively connected with an external hemodialysis machine through the base 2 and the puncture medical equipment to form a blood circulation loop, so that the dialysis operation is finished, and when the number of the auxiliary catheters 12 is three, the two side holes 13 are respectively connected with the arterial blood vessel and the venous blood vessel of the patient, and the last side hole 13 is used for first aid, for example, the side hole is pushed to the vena cava on the heart, the inner cavity of the leg and the like through a built-in operation guide wire, so that the treatment of other symptoms of the patient is realized at the same time of the dialysis operation. It is conceivable that the number of the sub-ducts 12 may be set to four, five or more, and in actual use, the number of the sub-ducts 12, the side holes 13, the base 2 and the locking mechanism 4 may be set correspondingly based on actual demands.
As shown in fig. 1 and 2, the greater the number of secondary ducts 12, the more likely the secondary ducts 12 will knot and thrombus will form between them, and thus, in some preferred embodiments of the application, the number of secondary ducts 12 is two.
In summary, the method of using the dialysis catheter of the present application is as follows:
S1, implanting a dialysis catheter into a body, connecting the side holes 13 with an arterial blood vessel and a venous blood vessel respectively, arranging the clamp 3 at a corresponding position of a collarbone, and arranging the base 2 under the skin;
S2, penetrating a puncture device connected with an external hemodialysis machine into a silica gel diaphragm of the base 2;
s3, starting the hemodialysis machine until the dialysis treatment is completed;
S4, closing the hemodialysis machine;
S5, whether the puncture device is pulled out or not and the pulling-out time are considered based on the condition of the patient.
While the foregoing is directed to embodiments of the present application, other and further embodiments of the application may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. A dialysis catheter, characterized by:
The catheter comprises a catheter (1) extending along the longitudinal direction, wherein the catheter (1) comprises a catheter body (11) at the distal end and at least two auxiliary catheters (12) communicated with the proximal end of the catheter body (11), inner cavities which are respectively and correspondingly communicated with the auxiliary catheters (12) are arranged in the catheter body (11), and side holes (13) corresponding to the distal ends of a plurality of inner cavities are formed;
The blood dialysis device further comprises a base (2), wherein the base (2) is connected to the proximal end of the auxiliary catheter (12) and is communicated with the auxiliary catheter (12) which is connected, the side wall and the end face of the base (2) are of arc-shaped structures, and the base (2) is connected with an external blood dialysis machine.
2. A dialysis catheter according to claim 1, wherein:
the base (2) is of a cap-shaped structure with one end open and one end closed, and the open end is connected with the silica gel diaphragm in a matched mode.
3. A dialysis catheter according to claim 1, wherein:
the locking device is characterized by further comprising locking mechanisms (4) which are in one-to-one correspondence with the auxiliary guide pipes (12), protruding portions are arranged on the outer sides of the bases (2), the protruding portions are of tubular structures, the locking mechanisms (4) are sleeved on the peripheries of the auxiliary guide pipes (12) and the protruding portions, and the auxiliary guide pipes (12) are tightly held and connected with the protruding portions.
4. A dialysis catheter according to claim 3, characterized in that:
the locking mechanism (4) comprises a supporting ring (41) and a lock catch (42), wherein the supporting ring (41) can be wrapped to form a non-closed cylindrical structure, the lock catch (42) is connected to one end of the movable end of the supporting ring (41), and the other end of the supporting ring (41) is in locking connection with the lock catch (42).
5. The dialysis catheter of claim 4, wherein:
The supporting ring (41) comprises a supporting ring body (411) and an expansion part (412), one end of the supporting ring body (411) along the wrapping direction is connected with the lock catch (42), the other end of the supporting ring body is connected with the expansion part (412), and the other end of the expansion part (412) is in locking connection with the lock catch (42);
The width of the expansion part (412) along the longitudinal extension direction of the auxiliary conduit (12) is smaller than the width of the supporting ring body (411) along the longitudinal extension direction of the auxiliary conduit (12).
6. A dialysis catheter according to claim 1, wherein:
the novel catheter also comprises a clamp (3), wherein the clamp (3) is sleeved and connected to the periphery of the catheter body (11), and the clamp (3) corresponds to the position of the collarbone.
7. The dialysis catheter of claim 6, wherein:
The clamp (3) is made of at least one metal alloy or fiber material selected from stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy and noble metal alloy.
8. A dialysis catheter according to claim 1, wherein:
The catheter body (11) is made of at least one material selected from silicone rubber, polyurethane, polyvinyl chloride, polyethylene, polypropylene and polytetrafluoroethylene materials, and the distal end of the catheter body is in a sharp inclined surface structure.
9. A dialysis catheter according to claim 1, wherein:
the number of the auxiliary ducts (12) is two.
10. A dialysis catheter according to claim 1, wherein:
the base (2) is made of at least one metal alloy selected from stainless steel, titanium alloy, cobalt-based alloy, nickel-titanium alloy and noble metal alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411774120.7A CN119564963A (en) | 2024-12-04 | 2024-12-04 | Dialysis catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411774120.7A CN119564963A (en) | 2024-12-04 | 2024-12-04 | Dialysis catheter |
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| Publication Number | Publication Date |
|---|---|
| CN119564963A true CN119564963A (en) | 2025-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411774120.7A Pending CN119564963A (en) | 2024-12-04 | 2024-12-04 | Dialysis catheter |
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| CN213822856U (en) * | 2020-09-10 | 2021-07-30 | 绵阳市中心医院 | Complete implantation type long-term indwelling device for dialysis |
| CN216061482U (en) * | 2021-08-06 | 2022-03-18 | 怀化市第二人民医院(怀化市肿瘤医院) | Hemodialysis pipe assembly |
| US20230090684A1 (en) * | 2020-02-12 | 2023-03-23 | The Board Of Trustees Of The Leland Stanford Junior University | A Modular Catheter System |
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| US5041098A (en) * | 1989-05-19 | 1991-08-20 | Strato Medical Corporation | Vascular access system for extracorporeal treatment of blood |
| US5380276A (en) * | 1994-02-28 | 1995-01-10 | The Kendall Company | Dual lumen catheter and method of use |
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| US20230090684A1 (en) * | 2020-02-12 | 2023-03-23 | The Board Of Trustees Of The Leland Stanford Junior University | A Modular Catheter System |
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| CN216061482U (en) * | 2021-08-06 | 2022-03-18 | 怀化市第二人民医院(怀化市肿瘤医院) | Hemodialysis pipe assembly |
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