Catheter assembly with self-deformation catheter

Abstract

The catheter assembly comprises the self-deformation catheter, a supporting pipe and a sub-catheter, the supporting pipe capable of being pulled out is arranged in the self-deformation catheter, a self-deformation section is arranged at the front end of the self-deformation catheter, the self-deformation section is supported by the supporting pipe and does not deform automatically, and when the supporting pipe is pulled out, the sub-catheter can be pulled out of the supporting pipe. The self-deformation section is automatically deformed and bent and sequentially forms a first self-deformation bent part and a second self-deformation bent part from front to back, the radian of the first self-deformation bent part is smaller than that of the second self-deformation bent part, and after the supporting pipe is completely drawn out, the sub-catheter enters the self-deformation catheter. According to the self-deformation catheter, the self-deformation section at the front end of the self-deformation catheter is gradually exposed and bent according to a pre-designed shape by driving the supporting tube in the self-deformation catheter to gradually retreat, so that the head end of the catheter can enter a corresponding branch blood vessel more easily.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a catheter assembly provided with a self-deformable catheter. Background Art

[0002] In interventional examinations and treatments of the heart and peripheral blood vessels, it is often necessary to use catheter bending to allow the catheter to reach the target blood vessel location, but the operation is usually relatively difficult, especially when entering branch vessels, the catheter is more difficult to manipulate, such as the adrenal artery and vein and other blood vessels. In order to solve the above problems, a mother-and-child catheter structure has appeared in the prior art. When used, the mother catheter first enters the blood vessel to the lesion site, the guide wire extends inside the mother catheter, and then the child catheter follows the guide wire to reach the lesion site. Finally, medical devices such as stents or coronary balloons reach the lesion site through the child catheter. For example, a Chinese utility model patent with authorization announcement number CN203235117U discloses a mother-and-child guide catheter, in which the distal end of the child catheter is inserted from the proximal end of the mother catheter and extends from the distal end of the mother catheter through the mother catheter, and the child catheter and the mother catheter of the device are respectively connected to the corresponding catheter seat. In order to achieve independent use, the Chinese utility model patent with authorization announcement number CN205145352U also discloses a mother-and-child extension catheter and its child catheter. The child catheter of the device includes a catheter body, a catheter seat and a push rod, and the catheter body and the catheter seat are connected by a push rod to achieve extension and movement. The Chinese utility model patent with authorization announcement number CN208447867U discloses a coronary mother-and-child catheter, which includes a mother tube, a child tube and a spiral transmission mechanism, wherein the spiral transmission mechanism includes a rotating part and a linear motion part, and the linear motion part is connected to the child tube by a steel wire to drive the child tube to move. However, the design ideas of the above patents focus on how the rear end of the catheter drives the child tube to cooperate with the extension and movement, and for bifurcated vascular lesions, it is often difficult for the front end of the cavity catheter to enter the target branch vessel. Utility Model Content

[0003] The purpose of the utility model is to provide a catheter assembly provided with a self-deformable catheter, which drives the support tube inside the self-deformable catheter to gradually retreat so that the self-deformation section at the front end of the self-deformable catheter is gradually exposed and bent according to a pre-designed shape, thereby making it easier for the catheter head end to enter the corresponding branch blood vessel.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A catheter assembly provided with a self-deformable catheter comprises a self-deformable catheter, a support tube and a sub-catheter, wherein the self-deformable catheter is provided with a removable support tube inside, the front end of the self-deformable catheter is provided with a self-deformation section, and the self-deformation section is supported by the support tube and does not automatically deform, and when the support tube is withdrawn, the self-deformation section automatically deforms and bends to form a first self-deformation bend and a second self-deformation bend from front to back in sequence, wherein the curvature of the first self-deformation bend is smaller than that of the second self-deformation bend, and after the support tube is completely withdrawn, the sub-catheter is lowered into the self-deformable catheter.

[0006] The tube wall portion of the self-deforming section comprises a catheter outer layer, a self-deforming middle layer and a catheter inner layer which are sequentially arranged from the outside to the inside.

[0007] A sleeve is provided at the rear end of the self-deformable conduit, and a rear end tube for the support tube to pass through is provided at the rear end of the sleeve.

[0008] The self-deformable catheter comprises a catheter segment, and the front end of the catheter segment is fixedly connected to the self-deformable segment, and the rear end of the catheter segment is fixedly connected to the front end of the sleeve.

[0009] The self-deforming section wall, the catheter section wall and the sleeve wall are provided with guide wire channels that are connected in sequence. The guide wire is arranged in the guide wire channel and its front end is fixedly connected to the head end of the self-deforming section, and its rear end extends out from the rear end of the sleeve.

[0010] The rear end tube is provided with a locking screw, and the head end of the locking screw is inserted into a screw hole provided on the tube wall of the supporting tube.

[0011] The advantages and positive effects of the utility model are:

[0012] 1. The utility model drives the support tube inside the self-deformable catheter to gradually retreat so that the self-deformable section at the front end of the self-deformable catheter is gradually exposed and bent according to a pre-designed shape, thereby making it easier for the catheter head end to enter the corresponding branch blood vessel.

[0013] 2. The self-deformation section of the utility model can automatically form a first self-deformation bend and a second self-deformation bend after losing the support restriction of the internal support tube, wherein the second self-deformation bend has a larger curvature so that it gradually bends toward the main branch blood vessel during the gradual exposure process, and the first self-deformation bend at its front end can enter the main branch blood vessel during the bending process, and then the operator controls the movement of the self-deformation catheter to adjust the position and angle of the head end of the first self-deformation bend, so that the head end of the first self-deformation bend can be aligned with and smoothly enter the branch blood vessel, and finally the operator lowers the sub-catheter into the self-deformation catheter, and the sub-catheter can smoothly enter the branch blood vessel under the guidance of the self-deformation catheter.

[0014] 3. The utility model has a simple overall structure, and since the support tube and the sub-conduit are in a replacement relationship, the diameter of the conduit will not be increased additionally.

[0015] 4. The present invention can also add a guide wire according to actual needs to adjust the position of the head end of the self-deformation section after self-deformation, or adjust the bending deformation amplitude of each bending portion of the self-deformation section, so as to further ensure accurate operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A in the enlarged view,

[0018] Figure 3 for Figure 2 The working status of the middle structure Figure 1 ,

[0019] Figure 4 for Figure 2 The working status of the middle structure Figure 2 ,

[0020] Figure 5 for Figure 2 The working status of the middle structure Figure 3 ,

[0021] Figure 6 for Figure 1 The enlarged view of point B in the figure,

[0022] Figure 7 This is a schematic diagram of the state after the support tube is completely pulled out of the utility model.

[0023] Figure 8 for Figure 7 Schematic diagram of structural regulation at C in Figure 1 ,

[0024] Fig. 9 for Figure 7 Schematic diagram of structural regulation at C in Figure 2 ,

[0025] Fig.10 for Figure 7 Schematic diagram of structural regulation at C in Figure 3 ,

[0026] Fig.11 The state diagram of the utility model when the sub-catheter is inserted Figure 1 ,

[0027] Fig.12 The state diagram of the utility model when the sub-catheter is inserted Figure 2 ,

[0028] Fig.13 for Figure 2 The enlarged view of the structure at position I in the middle.

[0029] Fig.13a for Fig.13 A schematic diagram of the structure of an embodiment of the self-deformed middle layer,

[0030] Fig.14 for Figure 2 Another enlarged schematic diagram of the structure at I in the middle,

[0031] Fig.15 for Fig.14 Schematic diagram of the overall use of the embodiment in FIG.

[0032] Among them, 1 is a self-deformable catheter, 101 is a self-deformable segment, 1011 is a second self-deformable bend, 1012 is a first self-deformable bend, 1013 is a catheter outer layer, 1014 is a catheter inner layer, 1015 is a self-deformable middle layer, 10151 is a self-deformable rib, 10152 is a supporting mesh, 1016 is a guide wire channel, 1017 is a guide wire, 102 is a catheter segment, 2 is a supporting tube, 3 is a sleeve, 301 is a rear end tube, 302 is a locking screw, 4 is a sub-catheter, 5 is a main branch vessel, and 6 is a branch vessel. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0034] like Figures 1 to 15 As shown, the utility model comprises a self-deformable conduit 1, a support tube 2 and a sub-conduit 4, wherein Figures 2 to 5 As shown, the self-deformable conduit 1 is provided with a removable support tube 2 inside, the self-deformable conduit 1 is provided with a self-deformable section 101 at the front end, and the self-deformable section 101 is supported by the support tube 2 without automatic deformation, and when the support tube 2 is withdrawn, the self-deformable section 101 is automatically deformed and bent to form a first self-deformable curved portion 1012 and a second self-deformable curved portion 1011 from front to back, wherein the curvature of the first self-deformable curved portion 1012 is smaller than the curvature of the second self-deformable curved portion 1011, that is, Figure 5 and Figures 7-10 As shown, the bending height L of the first self-deformable curved portion 1012 is less than the bending height H of the second self-deformable curved portion 1011, and the bending height H of the second self-deformable curved portion 1011 is less than the height of the main branch blood vessel 5. This ensures that during the process of gradually withdrawing the support tube 2, the first self-deformable curved portion 1012 can be automatically deformed and turned to enter the main branch blood vessel 5. In addition, as shown in FIG. Figures 7-10As shown, the support tube 2 is completely pulled out and thrown into a recycling bin (disposable product), and then the operator controls the self-deformable catheter 1 to move and adjust the position and angle of the first self-deformable curved portion 1012 with the assistance of medical imaging equipment and other instruments, thereby ensuring that the first self-deformable curved portion 1012 can be aligned with the branch blood vessel 6 on one side of the main blood vessel 5. Figure 8 As shown, after the first self-deformable curved portion 1012 enters the main branch vessel 5, its lower side can be attached to the inner wall of the main branch vessel 5 away from the branch vessel 6 to form a rotation fulcrum, and then the operator controls the self-deformable catheter 1 to swing the first self-deformable curved portion 1012 upward to achieve angle fine-tuning, such as pulling the self-deformable catheter 1 backward to swing the first self-deformable curved portion 1012 upward around the rotation fulcrum, and at the same time, the position of the first self-deformable curved portion 1012 can be moved and adjusted as needed until it is as shown in FIG. Fig. 9 As shown, the tip of the first self-deformable curved portion 1012 is aligned with the branch blood vessel 6, and then Fig.10 As shown, the operator drives the self-deformable catheter 1 forward to move slightly so that the tip of the first self-deformable curved portion 1012 enters the branch vessel 6, and finally Figures 11-12 As shown, the operator lowers the sub-catheter 4 into the self-deformable catheter 1 , and the sub-catheter 4 can smoothly enter the branch blood vessel 6 under the guidance of the self-deformable catheter 1 .

[0035] like Figures 13 to 13a As shown, in this embodiment, the tube wall portion of the self-deformation section 101 includes a catheter outer layer 1013, a self-deformation middle layer 1015 and a catheter inner layer 1014 which are arranged in sequence from the outside to the inside, wherein the materials of the catheter outer layer 1013 and the catheter inner layer 1014 are the same as the existing catheter materials, and the self-deformation middle layer 1015 can be made of shape memory alloy material to achieve automatic deformation function, so that when the interior of the self-deformation section 101 is no longer supported by the support tube 2, the self-deformation section 101 can automatically form a pre-designed curved shape under the deformation action of the self-deformation middle layer 1015. In this embodiment, the self-deformation middle layer 1015 can include a support mesh 10152 and a self-deformation rib 10151, wherein the support mesh 10152 can be as Fig.13aThe structure shown is made of spiral steel wire or the steel wire is directly cross-arranged to form a mesh, the self-deformation ribs 10151 are arranged along the length direction of the catheter and are made of memory alloy, the self-deformation middle layer 1015 is integrally injection-molded into the catheter wall, and when the support tube 2 is withdrawn, the self-deformation middle layer 1015 realizes the self-deformation bending function under the self-deformation of the self-deformation ribs 10151. The memory alloy is a well-known technology in the art, for example, the invention patent with the authorization announcement number CN101641131B discloses shape memory alloy, and the invention patent with the authorization announcement number CN107320173B discloses an application of memory alloy, the spring ball is made of memory alloy (such as nickel titanium), and the spring ball is wound by a slender memory alloy strip, and the memory alloy strip of the spring ball can be reshaped under the action of external force, for example, it is shaped into a line shape and placed in the guide catheter, and the line spring is pushed out of the guide catheter after entering the vertebral body, and the line spring automatically deforms and rewinds into a spring ball.

[0036] like Figures 2 to 5 as well as Figures 7-10 As shown, in this embodiment, the self-deformation section 101 is automatically deformed and bent to form a first self-deformation curved portion 1012 and a second self-deformation curved portion 1011 from front to back, wherein the second self-deformation curved portion 1011 is gradually bent toward the main branch vessel 5 during the process of withdrawing the support tube 2 and the second self-deformation curved portion 1011 is sent into the main branch vessel 5. The specific curvature size of the first self-deformation curved portion 1012 and the second self-deformation curved portion 1011 can be designed according to actual needs.

[0037] like Figure 1 and Figure 6 As shown, in this embodiment, a sleeve 3 is provided at the rear end of the self-deformable catheter 1, and a rear end tube 301 is provided at the rear end of the sleeve 3, and the support tube 2 enters the self-deformable catheter 1 after passing through the rear end tube 301 and the sleeve 3, wherein a locking screw 302 is provided on the rear end tube 301, and the head end of the locking screw 302 is inserted into a screw hole provided on the tube wall of the support tube 2. In this way, during the implantation of the entire catheter assembly into the human body, the support tube 2 and the self-deformable catheter 1 will not move due to the action of the locking screw 302, thereby avoiding the situation in which the self-deformation section 101 at the front end of the self-deformable catheter 1 is deformed in advance due to the backward movement of the support tube 2, affecting the implantation. In addition, a small gap can be left between the inner wall of the self-deformable catheter 1 and the outer wall of the support tube 2 according to actual needs to ensure that the support tube 2 can support the self-deformable catheter 1 without automatic deformation, and the support tube 2 can be more smoothly pulled out later, thereby facilitating the operator to control the movement of the support tube 2. The structure of the sleeve 3 is well known in the art, for example, the sleeve structure in CN203235117U can be adopted.

[0038] like Figure 2 As shown, in this embodiment, the self-deformable catheter 1 includes a self-deformable section 101 and a catheter section 102, wherein the front end of the catheter section 102 is fixedly connected to the self-deformable section 101, and the rear end is fixedly connected to the sleeve 3, and the material of the catheter section 102 can be the same as that of the support tube 2, such as Figure 5 As shown, when the front end of the support tube 2 is completely retracted into the catheter section 102, the self-deforming section 101 is completely deformed and forms the first self-deforming curved portion 1012 and the second self-deforming curved portion 1011.

[0039] The utility model can also arrange a guide wire 1017 in the catheter wall of the self-deformable catheter 1 according to actual needs to assist in the deformation of the self-deformable section 101. Figures 14-15 As shown, in another embodiment of the utility model, the outer layer 1013 of the catheter of the self-deformation section 101 and the wall of the catheter section 102 and the wall of the sleeve 3 can be provided with guide wire channels 1016 that are connected in sequence according to actual needs. The guide wire 1017 is provided in the guide wire channel 1016 and the front end is fixedly connected to the inside of the head end of the self-deformation section 101, and the rear end of the guide wire 1017 extends from the rear end of the sleeve 3. Fig.15 As shown, the operator can adjust the position and angle of the head end of the self-deformation section 101 (that is, the head end of the first self-deformation curved portion 1012) or adjust the bending deformation amplitude of each curved portion of the self-deformation section 101 by pulling the guide wire 1017, thereby further facilitating the operator's operation and ensuring accurate operation. In this embodiment, the guide wire channel 1016 is provided in the outer layer 1013 of the catheter. The utility model can also provide the guide wire channel 1016 in the inner layer 1014 of the catheter or in the self-deformation middle layer 1015 according to actual needs.

[0040] The self-deformable catheter 1 can be a common catheter or a sheath tube.

[0041] The working principle of the utility model is:

[0042] like Figures 1 to 15 As shown, when the utility model is implanted, the support tube 2 is always placed in the self-deformable catheter 1, and the self-deformable section 101 at the front end of the self-deformable catheter 1 will not bend and deform into a pre-designed shape under the support of the support tube 2. When the catheter assembly is implanted in place, Figure 6 As shown, the operator first removes the locking screw 302 to allow the support tube 2 to move, and then Figures 2 to 5 As shown, the operator gradually pulls out the support tube 2 backwards, and during the process of pulling out the support tube 2, the self-deforming section 1 at the front end of the self-deforming catheter 1 also gradually deforms, as shown in FIG. Figures 4-5 as well as Figure 7As shown in the figure, during the process that the second self-deformable curved portion 1011 is gradually exposed, the first self-deformable curved portion 1012 at the front end thereof will bend toward the main branch vessel 5 until it enters the main branch vessel 5, and the bending height L of the first self-deformable curved portion 1012 is smaller than the inner diameter of the main branch vessel 5 and the bending height H of the second self-deformable curved portion 1011, so as to ensure that the first self-deformable curved portion 1012 can smoothly enter the main branch vessel 5, and then Figures 7-10 As shown, the support tube 2 is completely pulled out and thrown into a recycling bin (disposable product). The operator adjusts the position and angle of the first self-deformed curved portion 1012 by pulling the self-deformed catheter 1 with the assistance of medical imaging equipment and other instruments. After the first self-deformed curved portion 1012 enters the main branch blood vessel 5, its lower side can be attached to the inner wall of the main branch blood vessel 5 away from the branch blood vessel 6 to form a rotation fulcrum. At this time, the operator pulls the self-deformed catheter 1 to make its head end swing around the rotation fulcrum to achieve angle fine-tuning until Fig. 9 As shown, the tip of the first self-deformable curved portion 1012 is aligned with the branch blood vessel 6, and then Fig.10 As shown, the operator drives the self-deformable catheter 1 forward to move slightly so that the tip of the first self-deformable curved portion 1012 enters the branch vessel 6, and finally Figures 11-12 As shown, the operator holds the sleeve 3 on the rear side of the self-deformable catheter 1 with one hand to make the second self-deformable curved portion 1011 tightly attached to the inner wall of the main blood vessel 5 close to the branch blood vessel 6, thereby preventing the tip of the first self-deformable curved portion 1012 from detaching from the branch blood vessel 6, and the operator inserts the sub-catheter 4 into the sleeve 3 with the other hand, and the sub-catheter 4 can smoothly enter the branch blood vessel 6 under the guidance of the self-deformable catheter 1.

[0043] like Figures 14-15 As shown, in another embodiment of the utility model, a guide wire channel 1016 can be set in the tube wall according to actual needs, and a guide wire 1017 is set in the guide wire channel 1016 and the front end is fixedly connected to the head end of the self-deformation section 101, and the rear end of the guide wire 1017 extends from the rear end of the sleeve 3. Fig.15 As shown, the operator can adjust the position and angle of the head end of the self-deformation segment 101 (i.e., the head end of the first self-deformation bend 1012) by pulling the guide wire 1017, or adjust the bending deformation amplitude of each bend of the self-deformation segment 101, thereby further facilitating the operator's operation.

Claims

1. A catheter assembly provided with a self-deformable catheter, characterized in that: The invention comprises a self-deformable conduit (1), a support tube (2) and a sub-conduit (4), wherein a removable support tube (2) is provided inside the self-deformable conduit (1), a self-deformable section (101) is provided at the front end of the self-deformable conduit (1), and the self-deformable section (101) is supported by the support tube (2) and does not automatically deform, and when the support tube (2) is withdrawn, the self-deformable section (101) automatically deforms and bends to form a first self-deformable curved section (1012) and a second self-deformable curved section (1011) in sequence from front to back, wherein the curvature of the first self-deformable curved section (1012) is smaller than the curvature of the second self-deformable curved section (1011), and after the support tube (2) is completely withdrawn, the sub-conduit (4) is lowered into the self-deformable conduit (1).

2. The catheter assembly provided with a self-deformable catheter according to claim 1, characterized in that: The tube wall portion of the self-deforming section (101) comprises a catheter outer layer (1013), a self-deforming middle layer (1015) and a catheter inner layer (1014) which are arranged in sequence from the outside to the inside.

3. The catheter assembly with a self-deformable catheter according to claim 1, characterized in that: The rear end of the self-deformable conduit (1) is provided with a sleeve (3), and the rear end of the sleeve (3) is provided with a rear end tube (301) for the support tube (2) to pass through.

4. The catheter assembly provided with a self-deformable catheter according to claim 3, characterized in that: The self-deforming catheter (1) comprises a catheter section (102), wherein the front end of the catheter section (102) is fixedly connected to the self-deforming section (101), and the rear end is fixedly connected to the front end of the sleeve (3).

5. The catheter assembly with a self-deformable catheter according to claim 4, characterized in that: The wall of the self-deforming section (101), the wall of the catheter section (102) and the wall of the sleeve (3) are provided with guide wire channels (1016) which are connected in sequence. The guide wire (1017) is arranged in the guide wire channel (1016) and its front end is fixedly connected to the inside of the head end of the self-deforming section (101), and the rear end of the guide wire (1017) extends out from the rear end of the sleeve (3).

6. The catheter assembly with a self-deformable catheter according to claim 3, characterized in that: The rear end tube (301) is provided with a locking screw (302), and the head end of the locking screw (302) is inserted into a screw hole provided on the tube wall of the support tube (2).

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