An apparatus for lymphatic and vascular connections

Abstract

The application discloses a device for lymphatic vessel and blood vessel connection, which comprises a blood vessel connection tube, a connection waist tube, at least one connection branch tube and at least one lymphatic connection tube. The device is characterized in that the lymphatic connection tube is arranged on the side wall of the lymphatic vessel through the special lymphatic connection tube and the connection branch tube, and the lymphatic connection tube is connected with the lymphatic vessel in an end-to-side mode. Since the lymphatic connection tube has a certain length, the side wall of the lymphatic connection tube is connected with the connection branch tube, and the connection branch tube and the lymphatic connection tube form a lap joint structure, so that the lymphatic connection tube can be lap jointed in the lymphatic vessel, the lymphatic vessel is expanded by the lymphatic connection tube, and the elastic tightening is wrapped on the outer wall of the lymphatic connection tube, thereby forming a stable connection, the lymphatic vessel is not cut, the damage to the human body is smaller, the connection is more stable, the connection is not easy to fall off, and the end-to-side connection mode is also beneficial to the suture of the lymphatic vessel, thereby further enhancing the stability of the lymphatic vessel connection.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a device for connecting lymphatic vessels and blood vessels. Background Technology

[0002] Lymphaticovenous anastomosis (LVA) is an important surgical procedure for treating lymphatic drainage disorders and related diseases such as Alzheimer's disease. The core of this surgery lies in anastomosing lymphatic vessels with adjacent veins, establishing a drainage pathway for lymphatic fluid into the venous system. In recent years, in particular, deep cervical lymphaticovenous anastomosis has shown great potential in improving Alzheimer's disease symptoms, working by draining cerebral lymph to remove deposited harmful proteins. Currently, commonly used LVA procedures employ direct suturing or simple rigid connection instruments to achieve the anastomosis between lymphatic vessels and veins.

[0003] Currently, lymphatic vessel connections are mostly made by end-to-end connection with instruments. This method makes the lymphatic vessels prone to dislodgement and the connection unstable, which can easily lead to failure of anastomosis between lymphatic vessels and veins, affecting the treatment effect and posing risks to patients. Summary of the Invention

[0004] The main objective of this invention is to provide a device for connecting lymphatic vessels and blood vessels, in order to solve the technical problem that lymphatic vessels are prone to detachment in the prior art.

[0005] To achieve the above objectives, the present invention proposes an instrument for connecting lymphatic vessels and blood vessels, comprising: a vascular connecting tube, a connecting waist tube, at least one connecting branch tube, and at least one lymphatic connecting tube, wherein lymph fluid can enter the bloodstream through the lymphatic connecting tube, the connecting branch tube, the connecting waist tube, and the vascular connecting tube; The vascular connecting tube is centrally located with openings at both ends and a through hole on its outer peripheral wall. The vascular connecting tube can be inserted into the blood vessel through an incision in the side wall of the blood vessel. The connecting waist tube has a first end and a second end. The connecting waist tube has a guide channel that passes through the first end and the second end. The first end is connected to the outer peripheral wall of the blood vessel connecting tube and communicates with the through hole. The connecting branch pipe has one end connected to the second end and connected to the flow channel, and the connecting branch pipe closes the second end; The lymphatic connection tube can be inserted into the lymphatic tube through a cut in the side wall of the lymphatic tube. Along the direction of lymph flow, the lymphatic connection tube has an inlet section and a closed section. A through hole is opened in the side wall of the lymphatic connection tube. The through hole is located in the inlet section and communicates with the inlet section. The other end of the connecting branch tube is connected to the side wall of one of the lymphatic connection tubes and communicates with the through hole. Alternatively, the lymphatic connection tube is a through tube with a through hole in its side wall, and the other end of the connecting branch tube is connected to the side wall of one of the lymphatic connection tubes and communicates with the through hole.

[0006] Furthermore, at least one of the inlet section and the sealing section has annular protrusions or barbs on its outer wall for fixing lymphatic vessels.

[0007] Furthermore, the connecting branch pipe includes a primary branch pipe and a secondary branch pipe that are interconnected. One end of the primary branch pipe is connected to the second end of the connecting waist pipe, and the other end is connected to one end of the secondary branch pipe. The other end of the secondary branch pipe is connected to the side wall of the lymphatic connecting pipe and communicates with the through hole.

[0008] Furthermore, the primary branch pipe and the secondary branch pipe differ in at least one of their materials and hardness.

[0009] Furthermore, the primary branch pipe is a flexible tube, and the secondary branch pipe is a rigid tube.

[0010] Furthermore, the lymphatic connection tube is a rigid tube.

[0011] Furthermore, the diameter of the flow channel gradually decreases from the second end to the first end.

[0012] Furthermore, the flow channel is a spiral channel, and the diameter of the spiral gradually decreases from the second end to the first end.

[0013] The equation for the spiral extension curve of the flow guide channel in Cartesian coordinates is: X(t)=1 / 2*(D2-(D2-D1)*t)*cos(2π*n*t) Y(t)=1 / 2*(D2-(D2-D1)*t)*sin (2π*n*t) Z(t) = L*t, Wherein, D1 represents the spiral diameter of the guide channel at the first end, D2 represents the spiral diameter of the guide channel at the second end, L represents the axial height of the guide channel, n represents the number of spiral turns, and t is a coefficient, with a value ranging from 0 to 1.

[0014] Furthermore, the inner diameter of the flow guiding channel is 0.1 mm to 4.0 mm, and the helix angle of the flow guiding channel is 10° to 60°.

[0015] The beneficial effects of the technical solution of this invention are as follows: The device for connecting lymphatic vessels and blood vessels of the present invention, by setting a special lymphatic connecting tube and a connecting branch tube, allows the lymphatic connecting tube to be inserted into the lymphatic vessel through an incision in the side wall of the lymphatic vessel. It is connected to the lymphatic vessel end-to-side. Since the lymphatic connecting tube has a certain length, the connecting branch tube connects to the side wall of the lymphatic connecting tube, and the connecting branch tube and the lymphatic connecting tube form an overlapping structure, allowing the lymphatic connecting tube to overlap inside the lymphatic vessel. The lymphatic vessel is stretched open by the lymphatic connecting tube and elastically tightens to cover the outer wall of the lymphatic connecting tube, thereby forming a stable connection. There is no need to cut the lymphatic vessel, resulting in less damage to the human body, greater stability, and less likelihood of detachment. The end-to-side connection method also facilitates suturing of the lymphatic vessel, thereby further enhancing the stability of the lymphatic vessel connection.

[0016] In summary, this device achieves efficient and stable connection between lymphatic vessels and blood vessels, effectively improving the overall drainage effect of lymphatic fluid. It is especially suitable for clinical scenarios requiring efficient drainage, such as deep neck lymphatic-venous anastomosis related to Alzheimer's disease. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a device for connecting lymphatic vessels and blood vessels according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the internal structure of the instrument; Figure 3 for Figure 2 Schematic diagram of the spiral structure of the central guide channel.

[0018] Explanation of icon numbers: 100. Vascular connection tube; 110. Opening; 120. Through hole; 200. Connecting waist tube; 210. First end; 220. Second end; 230. Drainage channel; 300. Connecting branch tube; 310. Primary branch tube; 320. Secondary branch tube; 400. Lymphatic connection tube; 410. Inlet section; 420. Closed section; 430. Through hole. Detailed Implementation

[0019] The solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, the descriptions involving "first," "second," etc., in the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0020] To address the technical deficiencies in related technologies, this invention provides an instrument for connecting lymphatic vessels and blood vessels. Please refer to [link to relevant documentation]. Figures 1 to 3 The device includes: a vascular connecting tube 100, a connecting lumbar tube 200, at least one connecting branch tube 300, and at least one lymphatic connecting tube 400.

[0021] The vascular connecting tube 100 has a central opening and openings 110 at both ends. A through hole 120 is provided on the outer peripheral wall. The vascular connecting tube 100 can be inserted into the blood vessel through an incision in the side wall of the blood vessel.

[0022] The connecting waist tube 200 has a first end 210 and a second end 220. The connecting waist tube 200 has a guide channel 230 that passes through the first end 210 and the second end 220. The first end 210 is connected to the outer peripheral wall of the blood vessel connecting tube 100 and communicates with the through hole 120.

[0023] A central connecting branch pipe 300 is provided, with one end of the connecting branch pipe 300 connected to the second end 220 of the connecting waist pipe 200 and connected to the guide channel 230. The connecting branch pipe 300 closes the second end 220. When there are multiple connecting branch pipes 300, all of them together close the second end 220.

[0024] The lymphatic connecting tube 400 can be inserted into the lymphatic vessel through an incision in the side wall of the lymphatic vessel. Along the direction of lymph flow, the lymphatic connecting tube 400 has an inlet section 410 and a closed section 420. A through hole 430 is provided in the side wall of the lymphatic connecting tube 400, located in and communicating with the inlet section 410. The other end of a connecting branch tube 300 is connected to the side wall of one of the lymphatic connecting tubes 400 and communicates with the through hole 430. That is, when there are multiple connecting branch tubes 300, there are also multiple lymphatic connecting tubes 400, and the number of connecting branch tubes 300 and lymphatic connecting tubes 400 is the same and they are connected one-to-one. Preferably, multiple connecting branch tubes 300 and multiple lymphatic connecting tubes 400 are provided so that the device can connect to multiple lymphatic vessels, greatly increasing the lymph drainage volume and improving the treatment effect.

[0025] Lymph can enter the bloodstream via lymphatic connecting tube 400, connecting branch tube 300, connecting lumbar tube 200, and vascular connecting tube 100. Specifically, lymph flows into the inlet section 410 and enters the connecting branch tube 300 through the through hole 430. Lymph in one or more connecting branch tubes 300 converges into the guide channel 230 of the connecting lumbar tube 200, flows through the guide channel 230, and enters the vascular connecting tube 100 through the through hole 120. As the blood flows in the vascular connecting tube 100, it is carried into the bloodstream, thereby draining the lymph into the venous blood.

[0026] This instrument features a dedicated lymphatic connection tube 400, which can be inserted into the lymphatic vessel through an incision in the side wall of the lymphatic vessel. It connects to the lymphatic vessel end-to-side. Since the lymphatic connection tube 400 has a certain length, a connecting branch tube 300 connects to the middle side wall of the lymphatic connection tube 400. The connecting branch tube 300 and the lymphatic connection tube 400 form a T-shaped structure. The lymphatic connection tube 400 can overlap inside the lymphatic vessel, and the lymphatic vessel is stretched open by the lymphatic connection tube 400. It elastically tightens and covers the outer wall of the lymphatic connection tube 400, thus forming a stable connection. Compared with the end-to-end connection method, it is more stable and less prone to falling off. The end-to-side connection method also facilitates suturing of the lymphatic vessel, thereby further enhancing the stability of the connection.

[0027] Furthermore, the outer diameter of the lymphatic connection tube 400 is matched with the inner diameter of the lymphatic vessel, so that the lymphatic connection tube 400 can support the lymphatic vessel from within the lymphatic vessel. The connection between the lymphatic connection tube 400 and the lymphatic vessel is stabilized by the contraction force of the lymphatic vessel. This also facilitates the entry of lymph fluid into the inlet section 410 and makes leakage less likely.

[0028] To further enhance the stability of the connection and prevent the lymphatic vessels from dislodging, at least one of the inlet section 410 and the closing section 420 has annular protrusions or barbs on its outer wall for fixing the lymphatic vessels, thereby further restricting the displacement of the lymphatic vessels.

[0029] The connecting branch pipe 300 includes a primary branch pipe 310 and a secondary branch pipe 320 that are interconnected. One end of the primary branch pipe 310 is connected to the second end of the connecting waist pipe 200, and the other end is connected to one end of the secondary branch pipe 320. The other end of the secondary branch pipe 320 is connected to the side wall of the lymphatic connecting pipe 400 and communicates with the through hole 430.

[0030] Furthermore, the primary branch pipe 310 and the secondary branch pipe 320 differ in at least one of their materials and hardness. That is, the primary branch pipe 310 and the secondary branch pipe 320 are made of different materials, or the primary branch pipe 310 and the secondary branch pipe 320 are made of different hardnesses, or the primary branch pipe 310 and the secondary branch pipe 320 are made of different materials and have different hardnesses.

[0031] Specifically, the primary branch tube 310 is a soft tube, while the secondary branch tube 320 is a rigid tube. The lymphatic connection tube 400 is a rigid tube. The soft nature of the primary branch tube 310 allows for some directional and adjustment capabilities after surgery or implantation, which in turn allows the lymphatic connection tube 400 to adjust as well. During surgery, it can anastomose lymphatic vessels facing different directions, and after implantation, the entire instrument can adapt to limb compression or pulling, making it more advantageous for surgery and implantation compared to rigid tubes. The rigid nature of the secondary branch tube 320 and lymphatic connection tube 400 facilitates the placement of lymphatic vessels and prevents them from being compressed and flattened by the contraction of the lymphatic vessels, thus affecting lymphatic fluid flow. It also facilitates stable anastomosis of lymphatic vessels and lymphatic fluid drainage. Furthermore, both the secondary branch tube 320 and the lymphatic connection tube 400 are made of rigid metal. In other cases, the secondary branch tube 320 and the lymphatic connection tube 400 can also be rigid tubes made of other materials, such as polyurethane, polylactic acid, polytetrafluoroethylene, etc.

[0032] The secondary branch tube 320 is inserted into the interior of the primary branch tube 310 for connection, or it can be connected by heat fusion, bonding or other methods. The outer diameter of the secondary branch tube 320 can be the same as or smaller than the outer diameter of the primary branch tube 310, so as to facilitate the suturing of the lymphatic vessels at the periphery of the secondary branch tube 320.

[0033] To prevent blood from flowing back into the instrument or lymphatic vessels and affecting the drainage effect of lymph fluid, the diameter of the drainage channel 230 gradually decreases from the second end 220 to the first end 210. Specifically, the axial cross-section of the drainage channel 230 can be conical or parabolic.

[0034] In other configurations, the flow channel 230 is configured as a spiral channel, with the diameter of the spiral gradually decreasing from the second end 220 to the first end 210.

[0035] Specifically, the equation for the spiral extension curve of the flow guide channel 230 in the Cartesian coordinate system is as follows: X(t)=1 / 2*(D2-(D2-D1)*t)*cos(2π*n*t) Y(t)=1 / 2*(D2-(D2-D1)*t)*sin (2π*n*t) Z(t) = L*t, Wherein, D1 represents the spiral diameter (inner diameter) of the guide channel 230 at the first end 210, D2 represents the spiral diameter (inner diameter) of the guide channel 230 at the second end 220, L represents the axial height of the guide channel 230, n represents the number of spiral turns, and t is a coefficient, with a value ranging from 0 to 1.

[0036] Furthermore, the inner diameter of the flow channel 230 is 0.1 mm to 4.0 mm, and the helix angle of the flow channel 230 is 10° to 60°. By setting a spiral flow channel 230 and gradually reducing the diameter of the spiral from the second end 220 to the first end 210, the centripetal force and pipe resistance of the spiral channel can be used to make the lymph fluid flow more smoothly into the blood, while the blood is difficult to flow back, thus effectively preventing blood reflux.

[0037] In other embodiments, the lymphatic connection tube 400 can also be a through tube. The side wall of the lymphatic connection tube 400 has a through hole 430, and the other end of the connecting branch tube 300 is connected to the side wall of one of the lymphatic connection tubes 400 and communicates with the through hole 430. Since the lymphatic connection tube 400 is a through tube, when it is inserted into the lymphatic vessel through a cut in the side wall, the flow of lymphatic fluid can be maintained. If the lymphatic vessel becomes blocked, lymph fluid will enter the connecting branch tube 300 under the influence of the blockage, thus achieving lymph fluid drainage while maintaining a slight flow of lymph fluid within the lymphatic vessel.

[0038] This device features a dedicated lymphatic connection tube 400 and a connecting branch tube 300. The lymphatic connection tube 400 can be inserted into the lymphatic vessel through an incision in the side wall of the lymphatic vessel, connecting to the lymphatic vessel end-to-end. Since the lymphatic connection tube 400 has a certain length, the connecting branch tube 300 connects to the side wall of the lymphatic connection tube 400. The connecting branch tube 300 and the lymphatic connection tube 400 form an overlapping structure, allowing the lymphatic connection tube 400 to overlap inside the lymphatic vessel. The lymphatic vessel is stretched open by the lymphatic connection tube 400 and elastically tightens to cover the outer wall of the lymphatic connection tube 400, thus forming a stable connection. Compared with the end-to-end connection method, there is no need to cut the lymphatic vessel, resulting in less damage to the human body, greater stability, and less likelihood of detachment. The end-to-end connection method also facilitates suturing of the lymphatic vessel, further enhancing the stability of the connection.

[0039] The above description is only a part or preferred embodiment of the present invention. Neither the text nor the drawings should limit the scope of protection of the present invention. All equivalent structural transformations made using the content of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A device for connecting lymphatic vessels and blood vessels, characterized in that, include: The system includes a vascular connecting tube, a connecting waist tube, at least one connecting branch tube, and at least one lymphatic connecting tube, through which lymph fluid can enter the bloodstream; The vascular connecting tube is centrally located with openings at both ends and a through hole on its outer peripheral wall. The vascular connecting tube can be inserted into the blood vessel through an incision in the side wall of the blood vessel. The connecting waist tube has a first end and a second end. The connecting waist tube has a guide channel that passes through the first end and the second end. The first end is connected to the outer peripheral wall of the blood vessel connecting tube and communicates with the through hole. The connecting branch pipe has one end connected to the second end and connected to the flow channel, and the connecting branch pipe closes the second end; The lymphatic connection tube can be inserted into the lymphatic tube through a cut in the side wall of the lymphatic tube. Along the direction of lymph flow, the lymphatic connection tube has an inlet section and a closed section. A through hole is opened in the side wall of the lymphatic connection tube. The through hole is located in the inlet section and communicates with the inlet section. The other end of the connecting branch tube is connected to the side wall of one of the lymphatic connection tubes and communicates with the through hole. Alternatively, the lymphatic connection tube is a through tube with a through hole in its side wall, and the other end of the connecting branch tube is connected to the side wall of one of the lymphatic connection tubes and communicates with the through hole.

2. The device for connecting lymphatic vessels and blood vessels according to claim 1, characterized in that, At least one of the inlet section and the sealing section has annular protrusions or barbs on its outer wall for fixing lymphatic vessels.

3. The device for connecting lymphatic vessels and blood vessels according to claim 1, characterized in that, The connecting branch includes a primary branch and a secondary branch that are interconnected. One end of the primary branch is connected to the second end of the connecting waist tube, and the other end is connected to one end of the secondary branch. The other end of the secondary branch is connected to the side wall of the lymphatic connecting tube and communicates with the through hole.

4. The device for connecting lymphatic vessels and blood vessels according to claim 3, characterized in that, The primary branch pipe and the secondary branch pipe differ in at least one of their materials and hardness.

5. The device for connecting lymphatic vessels and blood vessels according to claim 3 or 4, characterized in that, The primary branch pipe is a flexible tube, and the secondary branch pipe is a rigid tube.

6. The device for connecting lymphatic vessels and blood vessels according to claim 5, characterized in that, The lymphatic connection tube is a rigid tube.

7. The device for connecting lymphatic vessels and blood vessels according to claim 1, characterized in that, The diameter of the flow channel gradually decreases from the second end to the first end.

8. The device for connecting lymphatic vessels and blood vessels according to claim 1, characterized in that, The flow channel is a spiral channel, and the diameter of the spiral gradually decreases from the second end to the first end.

9. The device for connecting lymphatic vessels and blood vessels according to claim 8, characterized in that, The equation for the spiral extension curve of the flow guide channel in Cartesian coordinates is: X(t)=1 / 2*(D2-(D2-D1)*t)*cos(2π*n*t) , Y(t)=1 / 2*(D2-(D2-D1)*t)*sin (2π*n*t) , Z(t) = L*t, Wherein, D1 represents the spiral diameter of the guide channel at the first end, D2 represents the spiral diameter of the guide channel at the second end, L represents the axial height of the guide channel, n represents the number of spiral turns, and t is a coefficient, with a value ranging from 0 to 1.

10. The device for connecting lymphatic vessels and blood vessels according to claim 9, characterized in that, The inner diameter of the flow guiding channel is 0.1 mm to 4.0 mm, and the helix angle of the flow guiding channel is 10° to 60°.

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