Auxiliary extension catheter

Abstract

The utility model relates to an auxiliary extension catheter which comprises an operating part, a connecting part and a functional part which are sequentially connected in the axial direction, the operating part is configured to receive fluid from the outside, and the connecting part comprises a first pipe body connected to the operating part and a second pipe body which is in fluid communication with the first pipe body and connected to the functional part. The functional part comprises a guide tube body allowing an instrument to pass through and an expansion body which is arranged on the guide tube body and can deform, the operating part is in fluid communication with the expansion body through the first tube body and the second tube body, the tube diameter of the second tube body is not larger than that of the first tube body, and when the instrument passes through the guide tube body, the expansion body is in fluid communication with the second tube body. And the instrument is arranged in parallel with the second tube body in the radial direction of the second tube body. According to the auxiliary extension catheter, the radial size of the auxiliary extension catheter can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of biomedical engineering industry, in particular to an auxiliary extension catheter. Background Art

[0002] Percutaneous coronary intervention (PCI) is a procedure that can unclog the coronary artery lumen and improve myocardial blood perfusion. In PCI surgery, the guide catheter is first pushed through the blood vessels to the entrance of the coronary artery, and then, under the guidance of the guide catheter, the guide wire or microcatheter and other instruments are pushed along the guide catheter to the desired position in the coronary artery, and then contrast agents are injected into the coronary artery to determine the stenosis site and dilate or implant stents in the stenosis site. However, in the process of pushing the instrument to the desired position, because the guide catheter only reaches the entrance of the coronary artery, the support force of the guide catheter to support the instrument to accurately reach the desired position of the coronary artery is insufficient.

[0003] The prior art discloses an extension catheter, after the guide catheter is pushed to the entrance of the coronary artery, the extension catheter can be pushed along the guide catheter to the vicinity of the desired position of the coronary artery, and then the instrument can be pushed along the extension catheter to the desired position. In this case, the extension catheter can provide further support for the instrument to accurately reach the desired position.

[0004] However, the above-mentioned prior art requires simultaneously involving the pushing process of the extension catheter and the instrument. In the radial direction of the extension catheter and the instrument, if the radial dimension of the extension catheter is large, it will occupy the operating space required for pushing the instrument, hindering the path of the instrument along the extension catheter, which is not conducive to the pushing process of the instrument. Summary of the invention

[0005] The utility model is proposed in view of the above-mentioned prior art conditions, and its purpose is to provide an auxiliary extension conduit capable of reducing radial dimensions.

[0006] To this end, the utility model provides an auxiliary extension catheter, comprising an operating part, a connecting part and a functional part connected in sequence along the axial direction, the operating part is configured to receive fluid from the outside, the connecting part comprises a first tube body connected to the operating part, and a second tube body fluidically connected to the first tube body and connected to the functional part, the functional part comprises a guide tube body through which an instrument can pass, and an expansion body arranged on the guide tube body and capable of deformation, the operating part is fluidically connected to the expansion body via the first tube body and the second tube body, the diameter of the second tube body is not larger than the diameter of the first tube body, and when the instrument passes through the guide tube body, the instrument is arranged parallel to the second tube body in the radial direction of the second tube body.

[0007] In the auxiliary extension catheter involved in the utility model, when the auxiliary extension catheter is pushed to the vicinity of the desired position, the operating part receives fluid from the outside, and the fluid can be transported to the expansion body through the first tube body and the second tube body to cause the expansion body to deform (for example, expand), and the expanded expansion body can abut against the blood vessel to form a support, so that the auxiliary extension catheter can be kept near the desired position, thereby the auxiliary extension catheter can provide support for the device to accurately reach the desired position. In addition, the diameter of the second tube body is not greater than the diameter of the first tube body, which can reduce the radial size of the auxiliary extension catheter. When the device is pushed, the device is arranged in parallel with the second tube body in the radial direction of the second tube body, and the second tube body can occupy a smaller space, thereby facilitating the pushing of the device.

[0008] In addition, in the auxiliary extension conduit of the present invention, optionally, the cross section of the second tube body perpendicular to the axial direction is flat, thereby facilitating further reducing the radial dimension of the auxiliary extension conduit.

[0009] In addition, in the auxiliary extension catheter involved in the utility model, optionally, at the connection between the first tube body and the second tube body, the first tube body changes diameter to become the second tube body, and the first tube body and the second tube body are integrally formed. In this case, the sealing performance at the connection between the first tube body and the second tube body can be improved, and when the expansion body is expanded by charging the expansion body, the pressure bearing capacity at the connection between the first tube body and the second tube body can be improved.

[0010] In addition, in the auxiliary extension catheter involved in the utility model, optionally, the connecting portion includes a solid connecting rod, one end of the connecting rod is connected to the first tube body, and the other end is connected to the outer periphery of the guide tube body, and at least part of the outer periphery of the second tube body is arranged to fit with the outer periphery of the connecting rod. In this case, compared with connecting the first tube body and the guide tube body only through the second tube body, the solid connecting rod can increase the bending resistance between the first tube body and the guide tube body, thereby facilitating the pushing of the auxiliary extension catheter. In addition, the outer periphery of at least part of the second tube body is arranged to fit with the outer periphery of the connecting rod, which can reduce the radial size of the auxiliary extension catheter as much as possible.

[0011] In addition, in the auxiliary extension catheter involved in the utility model, optionally, at least part of the outer periphery of the second tube body is arranged in contact with the outer periphery of the guide tube body, so that the part of the second tube body arranged in contact with the outer periphery of the guide tube body is the first sub-tube segment, and the connecting portion includes a wrapping layer arranged on the outer periphery of the guide tube body and wrapping the outer periphery of the first sub-tube segment with the outer periphery of the guide tube body. In this case, compared with only the outer periphery of the second tube body being in contact with the outer periphery of the guide tube body, the wrapping layer and the outer periphery of the guide tube body wrapping the outer periphery of the first sub-tube segment can play a supporting role for the first sub-tube segment, thereby reducing the risk of the first sub-tube segment being separated from the guide tube body.

[0012] In addition, in the auxiliary extension catheter involved in the utility model, optionally, the connecting rod blocks the end of the first tube body, an opening is provided on the outer periphery of the first tube body, the first tube body is fluidically connected with the second tube body through the opening, and the connecting portion includes a protective tube body, the protective tube body forms a sealed space that seals the portion of the first tube body with the opening and the portion of the second tube body that fits the connecting rod. In this case, when the first tube body and the second tube body are not directly connected, the first tube body can be fluidically connected with the second tube body through the opening without leakage under the sealing effect of the protective tube body, and compared with directly connecting the second tube body to the opening, the pressure bearing capacity of the first tube body and the second tube body at the fluid connection point can also be improved.

[0013] In addition, in the auxiliary extension conduit involved in the utility model, optionally, the part of the second tube body that is arranged in contact with the outer periphery of the connecting rod is a second sub-tube segment, and the outer periphery of the second sub-tube segment is welded to the outer periphery of the connecting rod. In this case, the connection strength between the second sub-tube segment and the connecting rod can be improved, and because the welding can make the connecting rod partially embedded in the outer periphery of the second sub-tube segment, the radial size of the auxiliary extension conduit can be further reduced.

[0014] In addition, in the auxiliary extension conduit involved in the utility model, optionally, the inner periphery of the protective tube body is respectively welded to the outer periphery of the second sub-tube segment and the outer periphery of the connecting rod. In this case, the welding area between the protective tube body, the second sub-tube segment and the connecting rod is larger, which can improve the pressure bearing capacity of the protective tube body, thereby reducing the possibility of the fluid stretching the protective tube body, thereby ensuring the sealing effect of the protective tube body on the second sub-tube segment. In addition, since the welding can make the second sub-tube segment and the connecting rod partially embedded in the inner periphery of the protective tube body, the radial size of the corresponding position of the auxiliary extension conduit can also be reduced.

[0015] In addition, in the auxiliary extension catheter involved in the utility model, optionally, the wrapping layer is fused to the outer periphery of the guide tube body and the outer periphery of the first sub-tube segment respectively. In this case, the first sub-tube segment can be embedded between the guide tube body and the wrapping layer, thereby improving the tightness of the first sub-tube segment and the guide tube body. In addition, since the welding can partially embed the first sub-tube segment into the outer periphery of the guide tube body, the radial size of the functional part can also be reduced, which is convenient for the auxiliary extension catheter to pass through the narrower part of the blood vessel.

[0016] In addition, in the auxiliary extension catheter involved in the present invention, optionally, the diameter of the first tube body is equal to the diameter of the second tube body, the connecting portion includes an auxiliary tube body arranged on the periphery of the first tube body, one end of the auxiliary tube body is connected to the operating portion, and the other end is connected to the periphery of the guide tube body, and the first tube body and the second tube body are integrally formed. In this case, the first tube body and the second tube body have equal diameters, and the flow rate almost does not change when the fluid flows, thereby improving the stability of the process of conveying the fluid to the expansion body. In addition, when the auxiliary extension catheter is longer, the auxiliary tube body can provide certain support for the first tube body and the second tube body. In addition, the integrally formed first tube body and second tube body can also improve the pressure bearing capacity at the connection.

[0017] According to the utility model, an auxiliary extension conduit with reduced radial dimensions can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will now be explained in further detail by way of example only with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram showing the application scenario of the auxiliary extension catheter involved in the example of the utility model.

[0020] Figure 2A is a schematic structural diagram showing an auxiliary extension conduit involved in a first embodiment of the utility model; Figure 2B is a schematic structural diagram showing an auxiliary extension conduit involved in a second embodiment of the utility model; Figure 2C 1 is a schematic structural diagram showing an auxiliary extension catheter involved in a third embodiment of the present utility model.

[0021] Figure 3 The utility model is shown along Figure 2A Section view along the midline AA'.

[0022] Figure 4A This utility model is shown Figure 2A Enlarged view of area a in the middle; Figure 4B This utility model is shown Figure 2B Enlarged view of area b; Figure 4C This utility model is shown Figure 2C Magnified image of area c.

[0023] Figure 5 The utility model is shown along Figure 2A Section view along the mid-section line BB'.

[0024] Fig. 6A The utility model is shown along Figure 2A Section view along the median section line CC'; Figure 6B The utility model is shown along Figure 2B Sectional view along the middle section line II'; Figure 6C The utility model is shown along Figure 2C Section view along the mid-section line PP'.

[0025] Figure 7 The utility model is shown along Figure 2B Section view along the median section line JJ'.

[0026] Figure 8 The utility model is shown along Figure 2C Section view along the mid-section line QQ'.

[0027] Fig. 9 The utility model is shown along Figure 2C Section view along the mid-section line RR'.

[0028] Description of reference numerals:

[0029] 1… auxiliary extension catheter, 11… operating part, 12… connecting part, 121… first tube body, 1211… opening, 122… second tube body, 1221… first sub-tube segment, 1222… second sub-tube segment, 123… wrapping layer, 124… auxiliary tube body, 1241… coupling segment, 125… connecting rod, 126… protective tube body, 13… functional part, 131… guide tube body, 1311… outer layer, 1312… middle layer, 1313… inner layer, 1314… instrument entrance, 132… expansion body, 133… developing ring, 134… developing tip, 2… guiding catheter, 3… coronary artery, 4… instrument. DETAILED DESCRIPTION

[0030] Hereinafter, with reference to the accompanying drawings, the preferred embodiments of the present invention will be described in detail. In the following description, the same symbols are assigned to the same components, and repeated descriptions are omitted. In addition, the accompanying drawings are only schematic diagrams, and the ratio of the dimensions of the components or the shapes of the components may be different from the actual ones.

[0031] It should be noted that the terms "including" and "having" and any variations thereof in the present invention, such as a process, method, system, product or device that includes or has a series of steps or units, are not necessarily limited to those steps or units clearly listed, but may include or have other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] It should be noted that, in this article, relative position and relative direction terms such as "above", "towards above", "below", "towards downward", "up and down direction", "left side", "towards the left side", "left side", "towards the left", "right side", "towards the right side", "right side", "towards the right", "left and right direction", "front", "towards the front", "back", "towards the back", "front and back direction" are used with reference to the normal operating posture and should not be considered restrictive.

[0033] The utility model relates to an auxiliary extension catheter, which is an auxiliary extension catheter for providing support force for an instrument, and further, is an auxiliary extension catheter for providing support force for the instrument to be pushed to a desired position in a coronary artery.

[0034] The desired position in the coronary artery involved in the utility model may refer to the lesion position in the coronary artery, such as the stenosis position or occlusion position in the coronary artery. Through the utility model, the radial size of the auxiliary extension catheter can be reduced, so as to facilitate the pushing process of the device.

[0035] The auxiliary extension catheter involved in the utility model may sometimes also be called an extended catheter or an auxiliary catheter.

[0036] Hereinafter, the auxiliary extension catheter involved in the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 Schematic diagram showing the application scenario of the auxiliary extension catheter 1 involved in the example of the utility model. Figure 1 The structures of the devices involved are simplified.

[0038] In some examples, the auxiliary extension catheter 1 can be used in Figure 1 In the application scenario shown. Specifically, after the guiding catheter 2 is pushed to the entrance of the coronary artery 3, the auxiliary extension catheter 1 can be pushed along the guiding catheter 2 to the vicinity of the desired position, and then the instrument 4 can be pushed along the auxiliary extension catheter 1 to the desired position. In this case, compared with only supporting the guiding catheter 2 to push the instrument 4 to the desired position, the auxiliary extension catheter 1 can provide further support for the instrument 4 to accurately reach the desired position.

[0039] In some examples, the device 4 can be used for percutaneous coronary intervention. In some examples, the device 4 can be delivered intravascularly and reach the coronary artery 3. In some examples, the device 4 can be a guide wire or a microcatheter, etc.

[0040] Figure 2A is a schematic structural diagram showing an auxiliary extension catheter 1 involved in the first embodiment of the utility model; Figure 2B is a schematic structural diagram showing an auxiliary extension catheter 1 involved in a second embodiment of the utility model; Figure 2C 1 is a schematic diagram showing the structure of the auxiliary extension conduit 1 according to the third embodiment of the present invention. Figure 2A , Figure 2B and Figure 2C In the figure, a partial structure of the auxiliary extension catheter 1 is processed in cross section.

[0041] In some examples, the auxiliary extension catheter 1 may include an operating portion 11 (see Figure 2A , Figure 2B and Figure 2C ). The operation portion 11 may be configured to receive fluid from the outside. In some examples, fluid may be infused into the auxiliary extension catheter 1 through the operation portion 11. In other words, the operation portion 11 may be a portion of the auxiliary extension catheter 1 for performing a fluid infusion operation.

[0042] In some examples, the operating portion 11 may have a Luer connector. For an introduction to the Luer connector, please refer to existing records and will not be repeated here.

[0043] In some examples, the auxiliary extension catheter 1 may include a connection portion 12 (see Figure 2A , Figure 2B and Figure 2C ). The connection portion 12 can provide a flow channel for the fluid received by the operating portion 11 from the outside.

[0044] In some examples, the connection portion 12 may be connected to the operating portion 11. In some examples, the connection portion 12 may include a first tube 121 connected to the operating portion 11 (see Figure 2A , Figure 2B and Figure 2C The first tube body 121 can be connected to the operating portion 11 by, for example, welding, bonding or clamping.

[0045] In some examples, the auxiliary extension catheter 1 may include a functional portion 13 (see Figure 2A , Figure 2B and Figure 2C ). The instrument 4 can move within the functional part 13.

[0046] In some examples, the functional portion 13 may include a guide tube 131 (see Figure 2A , Figure 2B and Figure 2C ). The guide tube body 131 can be used for the instrument 4 to pass through. Thus, the instrument 4 can move along the auxiliary extension catheter 1, and the moving path of the instrument 4 can be limited by the guide tube body 131. In some examples, the guide tube body 131 can be hollow.

[0047] In some examples, the functional portion 13 may include a deformable expansion body 132 (see Figure 2A , Figure 2B and Figure 2C ). The deformation of the expansion body 132 may include expansion and contraction. In this case, when the auxiliary extension catheter 1 is pushed to the vicinity of the desired position, the expansion body 132 is expanded so that the expansion body 132 can be supported against the blood vessel, thereby enabling the auxiliary extension catheter 1 to be maintained near the desired position, thereby enabling the auxiliary extension catheter 1 to provide support for the instrument 4 to accurately reach the desired position.

[0048] In some examples, the expansion body 132 may be deformed by means of pressure inflation or pressure relief. In some examples, the expansion body 132 may be deformed by means of fluid injection or fluid suction.

[0049] In some examples, the expansion body 132 may be disposed on the guide tube body 131 .

[0050] In some examples, the expansion body 132 may be disposed on the outer periphery of the guide tube body 131. Thus, the mutual influence between the expansion body 132 and the instrument 4 can be reduced.

[0051] In some examples, the connection portion 12 may be connected to the functional portion 13. In some examples, the connection portion 12 may include a second tube 122 connected to the functional portion 13. In some examples, the second tube 122 may be connected to the outer periphery of the guide tube 131. For example, the second tube 122 may be welded or bonded to the outer periphery of the guide tube 131.

[0052] In some examples, when the instrument 4 passes through the guide tube 131, the instrument 4 can be arranged parallel to the second tube 122 in the radial direction of the second tube 122. In other words, when the instrument 4 passes through the guide tube 131, the instrument 4 can be nearly parallel to the second tube 122.

[0053] In some examples, at least a portion of the outer periphery of the second tube body 122 may be disposed in close contact with the outer periphery of the guide tube body 131 (see Figure 2A and Figure 2CIn this case, the passage of the second tube body 122 and the passage of the guide tube body 131 can be separated from each other, which can reduce the mutual influence between the second tube body 122 and the instrument 4.

[0054] In some examples, at least a portion of the outer periphery of the second tube body 122 may be disposed in close contact with the inner periphery of the guide tube body 131 (see Figure 2B In this case, at least a portion of the second tube 122 can be disposed in the guide tube 131, which can help reduce the radial dimension of the functional portion 13, thereby facilitating the functional portion 13 to pass through a portion of the blood vessel with a smaller radial dimension. It is understandable that when at least a portion of the second tube 122 is disposed in the guide tube 131, the opening of the second tube 122 communicating with the expansion body 132 can be adaptively bent toward the expansion body 132 to allow the second tube 122 to communicate with the expansion body 132 in a fluid manner (see Figure 2B and Figure 2C ). In the present invention, fluid communication means that fluid can flow between two components.

[0055] In some examples, the operation part 11, the connection part 12 and the functional part 13 can be connected in sequence along the axial direction. Thus, the auxiliary extension catheter 1 can be roughly in the shape of a long strip, which is convenient for pushing in the blood vessel. In the present utility model, the extension direction of the auxiliary extension catheter 1 can be axial. Figure 2A The dashed line with an arrow in the middle shows the axial direction.

[0056] Figure 3 The utility model is shown along Figure 2A It should be noted that in the present invention, along the cross-sectional line AA' Figure 2B The cross-sectional view along the middle section line HH' and Figure 2C The cross-section of the middle section line OO' is Figure 3 The edge shown Figure 2A The cross-sectional views along the middle section line AA' are the same and are not shown separately.

[0057] In some examples, the diameter of the expansion body 132 may be 1.5 mm to 4.5 mm. For example, the diameter of the expansion body 132 may be 1.5 mm, 2 mm, 3 mm, or 4.5 mm.

[0058] See also Figure 3 In some examples, the guide tube body 131 may include an outer layer 1311 , a middle layer 1312 and an inner layer 1313 in sequence from the outer circumference to the inner circumference.

[0059] In some examples, the outer layer 1311 can be made of a material with a higher hardness. In some examples, the outer layer 1311 can be made of a polymer material with a higher hardness. Further, the outer layer 1311 can be made of polyether block polyamide (PEBAX). Thus, when the expansion body 132 is pressurized, the deformation of the guide tube body 131 can be reduced.

[0060] In some examples, the middle layer 1312 can be composed of a metal layer and a braided layer. In some examples, the middle layer 1312 can be composed of a single metal layer, or a single braided layer.

[0061] In some examples, the inner layer 1313 can be made of high density polyethylene (HDPE) or polytetrafluoroethylene (PTFE).

[0062] In some examples, the hardness of the guide tube body 131 may gradually decrease along the direction from the proximal end to the distal end. Specifically, the hardness of the outer layer 1311 may gradually decrease along the direction from the proximal end to the distal end. In this case, the various parts of the guide tube body 131 can have different degrees of bending properties, so that the guide tube body 131 can easily pass through the tortuous parts of the blood vessel. In the present utility model, the proximal end is the end close to the operating part 11, and the distal end is the end away from the operating part 11.

[0063] In some examples, the proximal end of the guide tube body 131 can have an instrument access port 1314 (see Figure 2A , Figure 2B and Figure 2C The angle between the instrument entrance 1314 and the axial direction may be an acute angle. In this case, the cross-sectional area at the instrument entrance 1314 can be increased, so that the instrument 4 can be easily introduced into the guide tube body 131.

[0064] In some examples, the functional portion 13 may include a developing ring 133. The developing ring 133 may be disposed near the instrument entrance 1314 (see Figure 2A , Figure 2B and Figure 2C ). Thus, the position of the instrument entrance 1314 can be easily indicated by the developing ring 133.

[0065] In some examples, the functional portion 13 may include a visualization tip 134. The visualization tip 134 may be disposed at the distal end of the guide tube body 131 (see Figure 2A , Figure 2B and Figure 2C). Thus, the developing tip 134 can conveniently indicate whether the auxiliary extension catheter 1 has reached the vicinity of the desired position.

[0066] In some examples, the material of the developing ring 133 and the developing tip 134 can be metal or resin.

[0067] In some examples, the second tube 122 may be in fluid communication with the first tube 121. It is understood that the fluid communication between the second tube 122 and the first tube 121 does not mean that the second tube 122 and the first tube 121 need to be directly connected.

[0068] In some examples, the operation portion 11 may be in fluid communication with the expansion body 132 via the first tube 121 and the second tube 122 , thereby facilitating the expansion body 132 to be directly filled with or sucked of fluid via the operation portion 11 .

[0069] In some examples, the diameter of the second tube body 122 may not be greater than the diameter of the first tube body 121. In other words, the diameter of the second tube body 122 may be less than or equal to the diameter of the first tube body 121. Thus, the radial dimension of the auxiliary extension catheter 1 can be reduced, thereby facilitating the pushing of the instrument 4.

[0070] In some examples, the material of the first tube body 121 may be metal. Further, the material of the first tube body 121 may be nickel-titanium alloy or stainless steel. In some examples, the first tube body 121 may be a hypotube. Thus, the first tube body 121 may have a higher hardness. In some examples, the material of the first tube body 121 may be a polymer material.

[0071] In some examples, the material of the second tube body 122 may be a polymer material. Further, the material of the second tube body 122 may be polyimide. Thus, it is convenient to weld the second tube body 122 and the guide tube body 131. In some examples, the material of the second tube body 122 may be metal.

[0072] Figure 4A This utility model is shown Figure 2A Enlarged view of area a in the middle; Figure 4B This utility model is shown Figure 2B Enlarged view of area b; Figure 4C This utility model is shown Figure 2C Magnified image of area c.

[0073] As described above, the second tube 122 can be fluidically connected to the first tube 121. In some examples, the second tube 122 can be directly connected to the first tube 121 (see Figure 4A and Figure 4BIn some examples, the second tube body 122 may be indirectly connected to the first tube body 121 (see Figure 4C ).

[0074] See also Figure 4A In some examples, at the connection between the first tube body 121 and the second tube body 122 , the first tube body 121 may be reduced in diameter to become the second tube body 122 .

[0075] In the first embodiment of the present invention, the first tube body 121 and the second tube body 122 can both be made of metal, so that the first tube body 121 and the second tube body 122 can have a relatively high hardness as a whole, thereby facilitating the pushing of the auxiliary extension catheter 1 .

[0076] Figure 5 The utility model is shown along Figure 2A Section view along the mid-section line BB'.

[0077] See also Figure 5 In some examples, the cross section of the second tube body 122 perpendicular to the axial direction may be flat. This can further reduce the radial dimension of the auxiliary extension catheter 1. In some examples, the cross section of the second tube body 122 perpendicular to the axial direction may be elliptical.

[0078] In some examples, the first tube body 121 and the second tube body 122 can be integrally formed (see Figure 4A and Figure 4B In this case, the sealing property of the connection between the first tube body 121 and the second tube body 122 can be improved, and when the expansion body 132 is expanded by pressurizing the expansion body 132, the pressure bearing capacity of the connection between the first tube body 121 and the second tube body 122 can be improved.

[0079] See also Figure 4B In some examples, at the connection between the first tube body 121 and the second tube body 122, the diameter of the first tube body 121 may be equal to the diameter of the second tube body 122. In other words, the first tube body 121 and the second tube body 122 may not change diameter at the connection. In this case, the first tube body 121 and the second tube body 122 have equal diameters, and the flow velocity of the fluid hardly changes when the fluid flows, thereby improving the stability of the process of conveying the fluid to the expansion body 132.

[0080] In the second embodiment of the present invention, the first tube body 121 and the second tube body 122 can both be made of polymer materials, so that the first tube body 121 can be easily welded to the operating part 11 and the second tube body 122 can be easily welded to the guide tube body 131, thereby improving the stability of the connection between the connecting part 12 and the operating part 11 and the functional part 13.

[0081] See also Figure 4C In some examples, the first tube body 121 and the second tube body 122 may not be directly connected.

[0082] In the third embodiment of the present invention, the first tube 121 may be made of metal, and the second tube 122 may be made of polymer material, so that the first tube 121 connected to the operation part 11 has a higher hardness and the second tube 122 and the guide tube 131 can be welded easily.

[0083] Fig. 6A The utility model is shown along Figure 2A Section view along the median section line CC'; Figure 6B The utility model is shown along Figure 2B Sectional view along the middle section line II'; Figure 6C The utility model is shown along Figure 2C Section view along the mid-section line PP'.

[0084] In some examples, the connection portion 12 may include a wrapping layer 123 (see Fig. 6A and Figure 6C ). The wrapping layer 123 may be disposed on the outer periphery of the guiding tube body 131 .

[0085] In some examples, the portion of the second tube body 122 that is arranged in close contact with the outer circumference of the guide tube body 131 is the first sub-tube segment 1221, and the wrapping layer 123 can wrap the outer circumference of the first sub-tube segment 1221 with the outer circumference of the guide tube body 131. In this case, compared with only the outer circumference of the second tube body 122 being in close contact with the outer circumference of the guide tube body 131, the wrapping layer 123 and the outer circumference of the guide tube body 131 wrapping the outer circumference of the first sub-tube segment 1221 can support the first sub-tube segment 1221, thereby reducing the risk of the first sub-tube segment 1221 being separated from the guide tube body 131.

[0086] In some examples, the wrapping layer 123 can be welded to the outer periphery of the guide tube body 131 and the outer periphery of the first sub-tube segment 1221. In this case, the first sub-tube segment 1221 can be embedded between the guide tube body 131 and the wrapping layer 123, thereby improving the tightness of the first sub-tube segment 1221 and the guide tube body 131. In addition, since the welding can partially embed the first sub-tube segment 1221 into the outer periphery of the guide tube body 131, the radial dimension of the functional part 13 can also be reduced, which is convenient for the auxiliary extension catheter 1 to pass through the narrow part of the blood vessel.

[0087] In some examples, the wrapping layer 123 may be made of a polymer material, so that the wrapping layer 123 can have good welding performance with the outer periphery of the guide tube body 131 and the outer periphery of the first sub-tube segment 1221 .

[0088] It is understandable that when the first sub-tube segment 1221 is disposed on the inner periphery of the guide tube body 131, the connecting portion 12 may not include the wrapping layer 123 (see Figure 6B ).

[0089] Figure 7 The utility model is shown along Figure 2B Section view along the median section line JJ'.

[0090] In some examples, the connecting portion 12 may include an auxiliary tube body 124 disposed on the outer periphery of the first tube body 121 (see Figure 2B and Figure 7 One end of the auxiliary tube body 124 may be connected to the operation part 11, and the other end may be connected to the outer periphery of the guide tube body 131. In this case, when the auxiliary extension catheter 1 is long, the auxiliary tube body 124 can provide certain support for the first tube body 121 and the second tube body 122.

[0091] In some examples, the auxiliary tube 124 may be made of metal.

[0092] In some examples, the auxiliary tube body 124 may have a connecting section 1241 extending in the axial direction and welded to the guide tube body 131 (see Figure 4B ). Thus, the connection strength between the connection portion 12 and the functional portion 13 can be improved.

[0093] As described above, the first tube body 121 and the second tube body 122 may not be directly connected. In view of this situation, the third embodiment of the present utility model is described in detail below.

[0094] Figure 8 The utility model is shown along Figure 2C Section view along the mid-section line QQ'. Fig. 9 The utility model is shown along Figure 2C Section view along the mid-section line RR'.

[0095] In some examples, the connecting portion 12 may include a solid connecting rod 125 (see Figure 2C and Figure 4C ). One end of the connecting rod 125 can be connected to the first tube 121, and the other end can be connected to the outer periphery of the guide tube 131. In this case, compared with connecting the first tube 121 and the guide tube 131 only through the second tube 122, the solid connecting rod 125 can increase the anti-bending performance between the first tube 121 and the guide tube 131, so as to facilitate the pushing of the auxiliary extension catheter 1.

[0096] In some examples, at least a portion of the outer circumference of the second tube body 122 and the outer circumference of the connecting rod 125 can be arranged to fit together (see Figure 8). Thus, the radial dimension of the auxiliary extension conduit 1 can be reduced as much as possible.

[0097] In some examples, the connecting rod 125 and the second tube 122 may be disposed together in the first tube 121. In some examples, the outer periphery of the connecting rod 125 and the outer periphery of the second tube 122 may be welded to the end of the first tube 121. Thus, the connecting rod 125 and the second tube 122 can be connected to the end of the first tube 121, and the first tube 121 and the second tube 122 can be fluidically connected.

[0098] In some examples, the connecting rod 125 may block the end of the first tube 121, and an opening 1211 may be provided on the outer periphery of the first tube 121 (see Figure 4C In some examples, the first tube 121 can be fluidically connected to the second tube 122 via the opening 1211 .

[0099] In some examples, the connection portion 12 may include a protective tube 126 (see Figure 4C ). The protective tube body 126 can form a sealed space that seals the portion of the first tube body 121 provided with the opening 1211 and the portion of the second tube body 122 that is in contact with the connecting rod 125. In this case, when the first tube body 121 and the second tube body 122 are not directly connected, the first tube body 121 can be fluidically connected to the second tube body 122 through the opening 1211 without leakage under the sealing effect of the protective tube body 126, and the pressure bearing capacity of the first tube body 121 and the second tube body 122 at the fluid connection point can be improved compared to directly connecting the second tube body 122 to the opening 1211.

[0100] In some examples, the material of the connecting rod 125 can be stainless steel. Further, the material of the connecting rod 125 can be 304 stainless steel or 316 stainless steel.

[0101] In some examples, the portion of the second tube body 122 that is arranged to fit the outer periphery of the connecting rod 125 is the second sub-tube segment 1222, and the outer periphery of the second sub-tube segment 1222 can be welded to the outer periphery of the connecting rod 125 (see Fig. 9 In this case, the connection strength between the second sub-tube segment 1222 and the connecting rod 125 can be improved. In addition, due to the welding, the connecting rod 125 can be partially embedded in the outer periphery of the second sub-tube segment 1222, thereby further reducing the radial dimension of the auxiliary extension catheter 1.

[0102] In some examples, the inner periphery of the protective tube body 126 can be welded to the outer periphery of the second sub-tube segment 1222 and the outer periphery of the connecting rod 125 respectively (see Fig. 9In this case, the welding area between the protection tube body 126, the second sub-tube segment 1222 and the connecting rod 125 is larger, which can improve the pressure bearing capacity of the protection tube body 126, thereby reducing the possibility of the fluid opening the protection tube body 126, thereby ensuring the sealing effect of the protection tube body 126 on the second sub-tube segment 1222. In addition, since the welding can make the second sub-tube segment 1222 and the connecting rod 125 partially embedded in the inner circumference of the protection tube body 126, the radial dimension at the corresponding position of the auxiliary extension catheter 1 can also be reduced.

[0103] In some examples, the material of the protection tube body 126 may be a polymer material, so that the protection tube body 126 can have good welding performance with the second sub-tube segment 1222 and the connecting rod 125 .

[0104] In the present invention, when the auxiliary extension catheter 1 is pushed to the vicinity of the desired position, the operating part 11 receives fluid from the outside, and the fluid can be transported to the expansion body 132 through the first tube body 121 and the second tube body 122, so that the expansion body 132 is deformed (for example, expanded), and the expanded expansion body 132 can be supported against the blood vessel, so that the auxiliary extension catheter 1 can be kept near the desired position, thereby the auxiliary extension catheter 1 can provide support for the instrument 4 to accurately reach the desired position. In addition, the diameter of the second tube body 122 is not greater than the diameter of the first tube body 121, which can reduce the radial size of the auxiliary extension catheter 1. When the instrument 4 is pushed, the instrument 4 is arranged in parallel with the second tube body 122 in the radial direction of the second tube body 122, and the second tube body 122 can occupy a smaller space, thereby facilitating the pushing of the instrument 4.

[0105] Although the utility model is specifically described above in conjunction with the accompanying drawings and examples, it is to be understood that the above description does not limit the utility model in any form. Those skilled in the art can modify and change the utility model as needed without departing from the essential spirit and scope of the utility model, and these modifications and changes all fall within the scope of the utility model.

Claims

1. An auxiliary extension catheter, characterized in that: The invention comprises an operating part, a connecting part and a functional part which are connected in sequence along the axial direction, the operating part is configured to receive fluid from the outside, the connecting part comprises a first tube body connected to the operating part, and a second tube body which is fluidically connected to the first tube body and connected to the functional part, the functional part comprises a guide tube body through which an instrument can pass, and an expansion body which is arranged on the guide tube body and can generate deformation, the operating part is fluidically connected to the expansion body via the first tube body and the second tube body, the tube diameter of the second tube body is not larger than the tube diameter of the first tube body, and when the instrument passes through the guide tube body, the instrument is arranged parallel to the second tube body in the radial direction of the second tube body.

2. The auxiliary extension catheter according to claim 1, characterized in that: A cross section of the second tube body perpendicular to the axial direction is flat.

3. The auxiliary extension catheter according to claim 1, characterized in that: At the connection between the first tube body and the second tube body, the first tube body changes in diameter to become the second tube body, and the first tube body and the second tube body are integrally formed.

4. The auxiliary extension catheter according to claim 1, characterized in that: The connecting portion includes a solid connecting rod, one end of which is connected to the first tube body and the other end is connected to the outer periphery of the guide tube body, and at least a portion of the outer periphery of the second tube body is arranged in close contact with the outer periphery of the connecting rod.

5. The auxiliary extension catheter according to claim 3 or 4, characterized in that: At least a portion of the outer circumference of the second tube body is fitted with the outer circumference of the guide tube body, so that the portion of the second tube body fitted with the circumference of the guide tube body is the first sub-tube segment, and the connecting part includes a wrapping layer which is arranged on the outer circumference of the guide tube body and wraps the outer circumference of the first sub-tube segment with the outer circumference of the guide tube body.

6. The auxiliary extension catheter according to claim 4, characterized in that: The connecting rod seals the end of the first tube body, and an opening is provided on the outer periphery of the first tube body. The first tube body is fluidically connected with the second tube body through the opening. The connecting part includes a protective tube body, and the protective tube body forms a sealed space that seals the part of the first tube body with the opening and the part of the second tube body that is in contact with the connecting rod.

7. The auxiliary extension catheter according to claim 6, characterized in that: The portion of the second tube body that is arranged in close contact with the outer circumference of the connecting rod is a second sub-tube segment, and the outer circumference of the second sub-tube segment is welded to the outer circumference of the connecting rod.

8. The auxiliary extension catheter according to claim 7, characterized in that: The inner periphery of the protection pipe body is respectively welded to the outer periphery of the second sub-pipe segment and the outer periphery of the connecting rod.

9. The auxiliary extension catheter according to claim 5, characterized in that: The wrapping layer is respectively welded to the outer periphery of the guide tube body and the outer periphery of the first sub-tube segment.

10. The auxiliary extension catheter according to claim 1, characterized in that: The diameter of the first tube body is equal to the diameter of the second tube body. The connecting portion includes an auxiliary tube body arranged on the periphery of the first tube body. One end of the auxiliary tube body is connected to the operating portion and the other end is connected to the periphery of the guide tube body. The first tube body and the second tube body are integrally formed.

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