Autologous blood transfusion device

Abstract

The invention belongs to the field of carotid artery stenosis medical instruments, and particularly relates to an autoblood transfusion device. Comprising a filter used for intercepting thrombus, the two ends of the filter are externally connected with backflow pipelines, the backflow pipelines are used for enabling blood in arteries to flow back to veins, the filter comprises a cavity of a pear-shaped structure and a filter element with a conical tail, and the filter element is installed in the cavity of the pear-shaped structure. The cavity of the filter can help blood fluid to move stably, and thrombus generation is reduced. And the conical structure at the tail part of the filter element can effectively reduce blood turbulence, and can store thrombus falling from a surgical part plate, so that the risk of blockage of the filter screen is reduced.

Description

Technical Field

[0001] The invention belongs to the field of medical devices for carotid artery stenosis, in particular to an autologous blood transfusion device. Background Art

[0002] Currently, there are two main ways to treat carotid stenosis. One is to perform a surgical operation to open the carotid artery and perform carotid endarterectomy (CEA). The other is to perform a minimally invasive operation to place a stent in the carotid artery through the femoral artery for carotid artery reconstruction surgery (CAS). The former has a higher surgical risk, and the latter requires the placement of protective devices such as umbrellas at the distal end of the carotid artery on the affected side in advance to prevent subsequent operations such as placing stents or other instruments through the lesion area, which may cause the plaque in the lesion area to fall off and form a thrombus, which will be washed to the distal end by the blood and enter the smaller blood vessels in the skull, causing a more serious stroke. The operation is difficult and the anti-embolism effect needs to be improved.

[0003] The new carotid artery reconstruction technique (TCAR) achieves proximal protection by building a reverse blood flow in the carotid artery to prevent the escape of thrombus debris. The carotid stenosis treatment reflux pipeline is used to connect the carotid artery and the lower limb vein when a reverse flow operation is required during carotid stenosis surgery. At the same time, a blood flow path switch and a 200μm filter are designed in the middle of the pipeline to block blood flow during surgery and filter out impurities such as thrombus and plate debris that may be generated.

[0004] The existing filter structure is as follows Figure 1 As shown, blood enters from the left port (inlet), and the blood clots that fall off the blood are intercepted by the filter element in the middle. The filtered blood enters the filter cavity and is output from the right port (outlet) under the action of the pressure difference, thereby completing the function of the instrument. In clinical use, it was found that the filter had many problems. Bubbles were always generated when the blood passed through the structure, turbulence was obvious, and blood clots were more likely to form. Moreover, the design of the top of the filter element did not conform to the design concept of fluid mechanics, which was also one of the important reasons for the formation of blood turbulence. In addition, the entire cavity space is relatively narrow, the transition of the cavity wall curve is relatively rigid, the resistance between the blood and the tube wall is large, which increases the loss of blood power and is prone to blood clots. Summary of the invention

[0005] In order to solve the above technical problems, this scheme proposes an adjustable anti-thrombotic autologous blood transfusion device, which adopts a more stable fluid mechanics structure and precisely designs the filter shape, filter element, cavity, and inlet and outlet, which can greatly reduce the occurrence of turbulence during blood backflow.

[0006] This application mainly adopts the following technical means:

[0007] An autologous blood transfusion device includes a filter for intercepting thrombus, wherein both ends of the filter are externally connected to a reflux pipeline, the reflux pipeline is used to return blood in the artery to the vein, the filter includes a pear-shaped cavity and a filter element with a tapered tail, and the filter element is installed in the pear-shaped cavity.

[0008] Furthermore, the cavity is a gradual structure, the curvature of the tube wall changes gradually from the input end to the output end, and the maximum distance from the outer edge of the filter element to the tube wall is L.

[0009] Furthermore, the diameter of the input end of the filter is D1, the diameter of the output end is D2, and there is a certain ratio between D1 and D2.

[0010] Furthermore, the front end of the cavity is provided with an internal thread, and the filter element is connected to the cavity via the internal thread.

[0011] Furthermore, the filter element includes: a connecting section at the bottom, which is connected to the flared opening of the blood inlet channel by a socket-type connection; a boss, which is tightly connected to the cavity through its external thread; a plurality of filter columns, which are supported on the boss as a skeleton; a hollow conical structure connected to the other side of the filter column; and a filter screen covering the outside of the filter column.

[0012] Furthermore, the filter mesh has an aperture of 200 μm and a total surface area of ​​not less than 10 cm 2 .

[0013] Furthermore, the cavity is connected to the bleeding duct, and a one-way valve is provided at the connection.

[0014] Furthermore, a shell is disposed outside the filter, and the shell is a cubic sealing structure.

[0015] Furthermore, a flow rate controller is provided on the blood inlet channel, and the flow rate controller is pressed to control the blood flow entering the filtering device by squeezing the channel.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The gradual structure of the cavity in this solution gradually changes the curvature of the tube wall from the input end to the output end, so that the blood experiences a smoother transition when flowing through the cavity. The above-mentioned gradual design helps to reduce turbulence and make the blood flow more stable. The curvature of the tube wall reduces the resistance between the blood and the tube wall, thereby reducing the loss of blood power. The shape of the cavity helps to reduce the residence time and pressure loss of blood in the filter, reducing the risk of thrombosis.

[0018] The filter element with a tapered tail can not only effectively guide blood flow and reduce turbulence, but also store fallen blood clots and reduce the risk of filter clogging.

[0019] Since the pressure at the input end is higher than that at the output end, the cross-sectional area of ​​the input port is designed to be about 20% smaller than that of the output port. This optimizes and reduces blood flow loss and blood congestion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a filter in the prior art;

[0021] Figure 2 It is a structural schematic diagram of a specific embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the filter structure of a specific embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the filter element structure of a specific embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the cavity structure of a specific embodiment of the present invention.

[0025] Numbers in the figure:

[0026] 1. Shell; 2. Blood inlet channel; 3. Bleeding duct; 4. One-way valve; 5. Filter; 6. Flow rate controller; 7. Filter element; 701. Connecting section; 702. Boss; 703. Filter column; 704. Conical structure; 8. Cavity; 801. Internal thread; 802. Curved shell; 803. Connecting port. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, the omission of certain well-known structures and their descriptions in the drawings is understandable.

[0029] This solution provides an adjustable anti-thrombotic autologous blood transfusion device, which is mainly used in hospital vascular surgeons' operations to treat carotid artery stenosis, and plays a role in filtering out dislodged thrombi when performing reverse blood flow operations.

[0030] See also Figure 2 The structure diagram of the autologous blood transfusion device is composed of multiple components: the product shell 1 is installed outside the filter 5, which is a transparent cubic sealing structure, and the internal blood filtration situation can be observed. The material is acrylonitrile-butadiene-styrene synthetic polymer resin (ABS), the overall size is about 15*5*5cm, and the thickness is 1mm.

[0031] The blood inlet channel 2 and the bleeding channel 3 are used to establish a reflux line. A filter 5 is connected between the blood inlet channel 2 and the bleeding channel 3, the other end of the blood inlet channel 2 is connected to the arterial end, and the other end of the bleeding channel 3 is connected to the venous end. The pipeline can be equipped with a Luer connector for easy connection and disassembly. The blood inlet channel 2 and the bleeding channel 3 are made of medical polyvinyl chloride (PVC). A flow rate controller 6 is installed above the blood inlet channel 2. Pressing a button controls the blood flow entering the filter 5 by squeezing the pipeline. A ball check valve is installed between the bleeding channel 3 and the filter 5. The swing type can be used to support only one-way blood flow to prevent blood backflow.

[0032] The filter element 7 is the main structure of the filter 5, and is made of nylon PA66. The connection part of the filter element 7 is connected to the blood inlet channel 2 through a flared socket type, and glue is used to achieve tight fixation. The boss 702 helps determine the connection depth to prevent over-insertion and uneven connection depth. In addition, the boss 702 serves as a base, and the four filter columns 703 are evenly distributed and fixed, covered with a filter screen, and connected to a conical structure 704 on the other side to play a supporting role. The tail end of the filter element 7 is a hollow cone to provide a buffer and prevent turbulence.

[0033] The filter mesh is adhered and covered on the outside of the filter column 703, and together with the filter core frame, forms the inner liner of the filter 5. The mesh opening diameter is 200 μm, which can intercept the detached thrombus larger than 200 μm. In addition, the total surface area of ​​the filter mesh is not less than 10 cm 2 , so that it has sufficient filtering capacity.

[0034] The cavity 8 is the outer shell of the filter 5 and is a gradual pear-shaped cavity structure. It is made of medical polyvinyl chloride (PVC) material and is transparent as a whole.

[0035] See also Figure 3Schematic diagram of filter structure, filter 5 input port is connected to the pipe from the carotid artery, and the high-pressure arterial blood flows into the filter from here, and the inner diameter of the pipe port is D1. The pipe connected to the output port extends to the femoral vein, and the filtered blood enters the vein with lower pressure, and the inner diameter of the pipe port is D2. The cross-sectional area of ​​the input port is about 20% smaller than that of the output port, that is, D1 / D2 is 0.9:1. This optimization reduces the loss of blood flow and reduces blood congestion.

[0036] See also Figure 4 Schematic diagram of the filter element structure, the filter element 7 includes a bottom connection section 701, which is designed as a socket connection, which is convenient for connection with the flared opening of the blood inlet channel 2 to achieve a stable connection and seal. Boss 702, the boss with external threads is tightly combined with the cavity 8 to ensure that the filter element will not loosen or leak during operation. Filter column 703, four filter columns constitute the skeleton of the filter element, supporting and stabilizing the boss 702. These filter column support structures are sturdy and contribute to the effective separation and filtration of the filter medium. Hollow conical structure 704, the other side of the filter column 703 is connected to a hollow conical structure. This design helps the flow and distribution of the fluid and prevents turbulence. Filter screen: The filter screen covering the outside of the filter column 703 is responsible for the actual filtering work, capturing impurities and particulate matter in the fluid to ensure the cleanliness of the fluid. The design of the filter element 7 improves the functionality and efficiency of the filter element through the collaboration of multiple components, and is suitable for various occasions requiring efficient filtration.

[0037] See also Figure 5 Schematic diagram of the cavity structure, the cavity 8 includes an internal thread 801 at the front, a curved housing 802 and a connection port 803. The internal thread 801 is connected to the external thread of the boss 702, so that the filter element 7 is connected to the cavity 8. The curved housing 802 is narrow at the front end and gradually widens at the back, presenting a vase shape or a pear shape as a whole. The curvature of the pipe wall from the input port to the output port changes slowly, and the maximum distance from the outer edge of the filter element to the pipe wall is L. The rear of the cavity 8 is a connection port 803, which is connected to the bleeding duct 3, and a one-way valve 4 is installed at the connection port 803.

[0038] When the autologous blood transfusion device provided in the embodiment of the present invention is applied to TCAR, one end of the blood inlet channel 2 of the autologous blood transfusion device is connected to the artery (specifically connected to the lesion area), and the other end of the bleeding duct 3 is connected to the vein. In this way, the pressure difference between the artery and the vein can be used to allow the blood in the lesion area that is stagnant due to the blockage to flow to the vein. In the process of flowing to the vein, the thrombus detached from the lesion area can be recovered by the filter 5, preventing the thrombus in the blood from flowing to the vein, thereby preventing the formation of thrombus due to too long TCAR time.

Claims

1. An autologous blood transfusion device, comprising a filter (5) for intercepting thrombus, wherein both ends of the filter (5) are externally connected to a return line, and the return line is used to return blood in the artery to the vein, characterized in that: The filter comprises a cavity (8) with a pear-shaped structure and a filter element (7) with a tapered tail, wherein the filter element (7) is installed in the cavity (8) with the pear-shaped structure.

2. The autologous blood transfusion device according to claim 1, characterized in that: The cavity (8) is a gradual structure, the curvature of the tube wall gradually changes from the input end to the output end, and the maximum distance from the outer edge of the filter element to the tube wall is L.

3. The autologous blood transfusion device according to claim 1, characterized in that: The input end diameter of the filter (5) is D1, and the output end diameter is D2, and there is a certain ratio between D1 and D2.

4. The autologous blood transfusion device according to claim 1, characterized in that: The front end of the cavity (8) is provided with an internal thread (801), and the filter element (7) is connected to the cavity (8) via the internal thread (801).

5. The autologous blood transfusion device according to claim 1, characterized in that: The filter element (7) comprises: a connecting section (701) at the bottom, which is connected to the expanded opening of the blood inlet channel (2) by means of a socket-type connection; a boss (702), which is tightly connected to the cavity (8) by means of its external thread; a plurality of filter columns (703), which are supported on the boss (702) as a skeleton; the other side of the filter column (703) is connected to a hollow conical structure (704); and the outside of the filter column (703) is covered with a filter screen.

6. The autologous blood transfusion device according to claim 1, characterized in that: The filter mesh has a pore size of 200 μm and a total surface area of ​​not less than 10 cm 2 .

7. The autologous blood transfusion device according to claim 1, characterized in that: The cavity (8) is connected to the bleeding duct (3), and a one-way valve (4) is provided at the connection.

8. The autologous blood transfusion device according to claim 1, characterized in that: A housing (1) is arranged outside the filter (5), and the housing (1) is a cubic sealing structure.

9. The autologous blood transfusion device according to claim 5, characterized in that: The blood inlet channel (2) is provided with a flow rate controller (6), and the flow rate controller (6) is pressed to control the blood flow entering the filtering device by squeezing the channel.

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