Autologous blood transfusion device

Abstract

The utility model 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 utility model belongs to carotid artery stenosis medical instrument field, concretely is a kind of autologous blood transfusion device. BACKGROUND

[0002] At present, there are mainly two ways to treat carotid artery stenosis, one is to perform surgery, open the carotid artery and perform carotid endarterectomy (CEA), and the other is to perform minimally invasive surgery, place a stent at the carotid artery through the femoral artery approach to perform carotid artery reconstruction (CAS). The former has a high risk of surgery, and the latter requires the placement of a protective device such as a protective umbrella in the distal end of the diseased carotid artery in advance to prevent the detachment of plaque in the lesion area during subsequent operations such as the placement of a stent or other instruments through the lesion area, causing the formation of thrombus, which is then flushed into the smaller intracranial vessels, causing more serious stroke. The operation is difficult and the anti-embolism effect needs to be improved.

[0003] The new carotid artery reconstruction (TCAR) achieves a proximal protection by building a reverse blood flow at the carotid artery to prevent the escape of thrombus debris. The carotid artery stenosis treatment reflux line is a reflux line connecting the carotid artery and the lower limb vein during the reverse flow operation in the carotid artery stenosis surgery. A blood flow path switch and a 200 μm filter screen are designed in the middle of the line to block the blood flow and filter the impurities such as thrombus and plaque debris during the operation.

[0004] The existing filter structure is shown in Figure 1 As shown in the figure, blood enters from the left side (inlet), passes through the middle filter core to intercept the detached thrombus in the blood, and the filtered blood enters the filter cavity and is output from the right side (outlet) under the action of pressure difference, thereby completing the function of the instrument. In clinical use, it is found that the filter has many problems, such as the generation of bubbles when blood passes through the structure, obvious turbulent flow, and easy formation of thrombus. Moreover, the design of the top of the filter core does not conform to the design concept of fluid mechanics, which is one of the important reasons for the formation of blood turbulent flow. In addition, the entire cavity space is relatively narrow, and the curve of the cavity wall is relatively harsh, the resistance between the blood and the pipe wall is large, which increases the loss of blood power and easily produces thrombus. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the present application proposes a self-blood transfusion device capable of adjusting and preventing thrombus formation, which adopts a more stable fluid mechanics structure, and precisely designs the filter shape, filter core, cavity and inlet and outlet, which can greatly reduce the occurrence of turbulent flow when blood flows backward.

[0006] The present application mainly adopts the following technical means:

[0007] An autologous blood transfusion device comprises a filter for intercepting thrombus, the filter is circumscribed by a return line at both ends, the return line is used for returning blood in an artery to a vein, the filter comprises a pear-shaped cavity and a tail-cone-shaped filter core, and the filter core is installed in the pear-shaped cavity.

[0008] Further, the cavity is a gradually changing structure, the curvature of the pipe wall gradually changes from the input end to the output end, and the maximum distance from the outer edge of the filter core to the pipe wall is L.

[0009] Further, the input end diameter of the filter is D1, the output end diameter is D2, and D1 and D2 have a certain ratio.

[0010] Further, the front end of the cavity is provided with internal threads, and the filter core is connected to the cavity through the internal threads.

[0011] Further, the filter core comprises: a connecting section at the bottom, which is connected to the flared end of the blood inlet pipe through a socket joint; a boss, which is tightly connected to the cavity through external threads; a plurality of filter columns, which are supported on the boss as a framework; a hollow cone structure connected to the other side of the filter column; and a filter screen covering the outer side of the filter column.

[0012] Further, the filter screen has a mesh opening diameter of 200 microns, and a total surface area of not less than 10 cm 2 .

[0013] Further, the cavity is connected to the blood outlet pipe, and a one-way valve is arranged at the connection.

[0014] Further, an outer shell is arranged outside the filter, and the outer shell has a cubic sealing structure.

[0015] Further, a flow rate controller is arranged on the blood inlet pipe, and the blood flow into the filter device is controlled by pressing the pipe through the flow rate controller.

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

[0017] The gradually changing structure of the cavity in the present scheme gradually changes the curvature of the pipe wall from the input end to the output end, so that the blood experiences a smoother transition when flowing through the cavity. The above gradually changing design helps to reduce turbulence and make the blood flow more stable. Through the curvature of the pipe wall, the resistance between the blood and the pipe wall is reduced, thereby reducing the loss of blood power. The shape of the cavity helps to reduce the residence time and pressure loss of the blood in the filter, thereby reducing the risk of thrombus formation.

[0018] The tail-cone-shaped filter core not only effectively guides the blood flow and reduces turbulence, but also stores the falling thrombus, thereby reducing the risk of filter screen blockage.

[0019] Because the input end is higher than the output end in pressure, the product is designed to have an input port with a cross-sectional area about 20% smaller than an output port. This optimization reduces the loss of blood flow and reduces blood flow stagnation. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0022] Figure 3 is a structural schematic diagram of a filter of a specific embodiment of the present application;

[0023] Figure 4 is a structural schematic diagram of a filter element of a specific embodiment of the present application;

[0024] Figure 5 is a structural schematic diagram of a cavity of a specific embodiment of the present application.

[0025] Reference numerals in the drawings:

[0026] 1, housing; 2, blood inlet conduit; 3, blood outlet conduit; 4, one-way valve; 5, filter; 6, flow rate controller; 7, filter element; 701, connecting section; 702, boss; 703, filter column; 704, tapered structure; 8, cavity; 801, internal thread; 802, curvature shell; 803, connecting port. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied in different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only schematically illustrate the basic concept of the present application, and the features in the following examples and embodiments can be combined with each other without conflict.

[0028] The drawings are only used for illustrative purposes, and the representation is only a schematic diagram, not a physical drawing, and should not be understood as a limitation of the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings are omitted.

[0029] The present application provides a self-blood return device capable of adjusting anti-thrombosis, which is mainly applied to the operation of treating carotid stenosis by vascular surgeons in hospitals, and plays a role of filtering detached thrombus during reverse blood flow operation.

[0030] Please refer to Figure 2 The self-blood return device is composed of multiple components: product shell 1, which is installed outside the filter 5, is a transparent cubic sealed structure, and the internal blood filtration condition can be observed. The material is acrylonitrile-butadiene-styrene synthetic polymer resin (ABS), and the overall size is about 15*5*5 cm, with a thickness of 1 mm.

[0031] The blood inlet pipe 2 and the blood outlet pipe 3 establish the return pipeline. The blood inlet pipe 2 is connected to the blood outlet pipe 3 through the filter 5, and the other end of the blood inlet pipe 2 is connected to the arterial end, and the other end of the blood outlet pipe 3 is connected to the venous end. The pipe can be equipped with a luer connector for easy connection and disassembly. The blood inlet pipe 2 and the blood outlet pipe 3 are made of medical polyvinyl chloride (PVC). The flow rate controller 6 is installed above the blood inlet pipe 2. By pressing the button, the blood flow into the filter 5 is controlled by extruding the pipe. A ball check valve is installed between the blood outlet pipe 3 and the filter 5, which can be a screw type, supporting only one-way blood flow, preventing backflow of blood.

[0032] The filter core 7 is the main structure of the filter 5, which is made of nylon PA66. The connection part of the filter core 7 is connected to the blood inlet pipe 2 through the flared socket type, and is tightly fixed by using glue. The boss 702 helps to determine the connection depth and prevent over-insertion. The boss 702 also serves as a base, with four filter columns 703 evenly distributed and fixed, covered with a filter screen on top, and connected to a conical structure 704 on the other side for support. The tail end of the filter core 7 is a hollow cone, providing cushioning to prevent turbulence.

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

[0034] The cavity 8 is the outer container of the filter 5, which is a gradually changing pear-shaped cavity structure made of medical polyvinyl chloride (PVC) material, and is transparent as a whole.

[0035] Please refer to Figure 3The filter structure schematic diagram of the utility model discloses shows that filter 5 input port connects from the pipeline of carotid artery, and the arterial blood flow of high pressure enters the filter screen from here, and the inner diameter of the pipe mouth is D1, and the output port connects the pipeline and extends to the femoral vein, and the filtered blood enters the vein of lower pressure, and the inner diameter of the pipe mouth is D2, and the input port is about 20% smaller than the cross section area of the output port, namely D1 / D2 is 0.9:1, so that the optimization reduces the loss of blood flow, and reduces the blood stasis.

[0036] Please refer to the filter structure schematic diagram of the utility model discloses shows that filter 5 input port connects from the pipeline of carotid artery, and the arterial blood flow of high pressure enters the filter screen from here, and the inner diameter of the pipe mouth is D1, and the output port connects the pipeline and extends to the femoral vein, and the filtered blood enters the vein of lower pressure, and the inner diameter of the pipe mouth is D2, and the input port is about 20% smaller than the cross section area of the output port, namely D1 / D2 is 0.9:1, so that the optimization reduces the loss of blood flow, and reduces the blood stasis. Figure 4 Please refer to the filter structure schematic diagram of the utility model discloses shows that filter 5 input port connects from the pipeline of carotid artery, and the arterial blood flow of high pressure enters the filter screen from here, and the inner diameter of the pipe mouth is D1, and the output port connects the pipeline and extends to the femoral vein, and the filtered blood enters the vein of lower pressure, and the inner diameter of the pipe mouth is D2, and the input port is about 20% smaller than the cross section area of the output port, namely D1 / D2 is 0.9:1, so that the optimization reduces the loss of blood flow, and reduces the blood stasis.

[0037] Please refer to the filter structure schematic diagram of the utility model discloses shows that filter 5 input port connects from the pipeline of carotid artery, and the arterial blood flow of high pressure enters the filter screen from here, and the inner diameter of the pipe mouth is D1, and the output port connects the pipeline and extends to the femoral vein, and the filtered blood enters the vein of lower pressure, and the inner diameter of the pipe mouth is D2, and the input port is about 20% smaller than the cross section area of the output port, namely D1 / D2 is 0.9:1, so that the optimization reduces the loss of blood flow, and reduces the blood stasis. Figure 5 Please refer to the filter structure schematic diagram of the utility model discloses shows that filter 5 input port connects from the pipeline of carotid artery, and the arterial blood flow of high pressure enters the filter screen from here, and the inner diameter of the pipe mouth is D1, and the output port connects the pipeline and extends to the femoral vein, and the filtered blood enters the vein of lower pressure, and the inner diameter of the pipe mouth is D2, and the input port is about 20% smaller than the cross section area of the output port, namely D1 / D2 is 0.9:1, so that the optimization reduces the loss of blood flow, and reduces the blood stasis.

[0038] When the autologous blood transfusion device is applied to TCAR, one end of the blood inlet pipeline 2 of the autologous blood transfusion device is connected to an artery (specifically connected to a lesion area), and the other end of the blood outlet pipeline 3 is connected to a vein, so that the pressure difference between the artery and the vein can be utilized to make the blood in the lesion area that stops flowing due to occlusion flow to the vein, and in the process of flowing to the vein, the thrombus detached from the lesion area can be recovered through the filter 5, so that the thrombus in the blood can be prevented from flowing to the vein, thereby avoiding the formation of thrombus due to too long TCAR time.

Claims

1. An autotransfusion device comprising a filter (5) for intercepting thrombi, the filter (5) circumscribing a return line at both ends, the return line being for returning blood from an artery to a vein, characterized in that, The filter comprises a pear-shaped cavity (8) and a tail cone-shaped filter core (7), and the filter core (7) is installed in the pear-shaped cavity (8).

2. The autologous blood transfusion device of claim 1, wherein, The cavity (8) is a gradually changing structure, and 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 core to the tube wall is L.

3. The autologous blood transfusion device of claim 1, wherein, The input end diameter of the filter (5) is D1, and the output end diameter is D2, and D1 and D2 have a certain ratio.

4. The autologous blood transfusion device of claim 1, wherein, The front end of the cavity (8) is provided with an internal thread (801), and the filter core (7) is connected to the cavity (8) through the internal thread (801).

5. The autologous blood transfusion device of claim 1, wherein, The filter core (7) comprises a connecting section (701) at the bottom, which is connected to the flared end of the blood inlet pipe (2) through a socket joint; a boss (702) which is tightly connected to the cavity (8) through an external thread; a plurality of filter columns (703) which are supported on the boss (702) as a framework; a hollow conical structure (704) connected to the other side of the filter column (703); and a filter screen covering the outer side of the filter column (703).

6. The autologous blood transfusion device of claim 5, wherein, The filter screen mesh orifice diameter is 200 μm, and the total surface area is not less than 10 cm 2 .

7. The autologous blood transfusion device of claim 1, wherein, The cavity (8) is connected to the blood outlet pipe (3), and a one-way valve (4) is arranged at the connection.

8. The autologous blood transfusion device of claim 1, wherein, The filter (5) is externally provided with a shell (1), and the shell (1) is a cubic sealed structure.

9. The autologous blood transfusion device of claim 5, wherein, A flow rate controller (6) is arranged on the blood inlet pipe (2), and the blood flow into the filter device is controlled by pressing the flow rate controller (6) to extrude the pipe.

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