A medical catheter sheath set

Abstract

A medical catheter sheath assembly of the present invention comprises a dilator, a catheter sheath, a plurality of convex pieces and a plurality of cover pieces. Among them, a plurality of convex pieces are arranged on the side wall of the dilator seat of the dilator along the circumference of the dilator seat, and each convex piece is provided with a plurality of limiting convex points; a plurality of cover pieces are arranged on the catheter sheath seat of the catheter sheath along the circumference of the catheter sheath, and a plurality of grooves are correspondingly provided on the plurality of cover pieces, and the plurality of grooves correspond to and are arranged in coordination with the plurality of convex pieces, and a plurality of limiting grooves are provided on the inner side wall of each groove, and the plurality of limiting grooves correspond to the plurality of limiting convex points arranged on the corresponding convex pieces. The staff of the medical catheter sheath assembly of the present invention can sense whether the dilator seat and the catheter sheath assembly are connected by whether the limiting convex points enter the corresponding limiting grooves, so that the feedback during the operation is more obvious, and it can also prevent the sliding of the dilator from causing the dilator and the catheter sheath to separate by themselves.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a medical catheter sheath set. Background Art

[0002] In interventional surgery, femoral artery puncture is the most commonly used access route, and establishing access necessarily requires the support of relevant instruments. Therefore, auxiliary instruments such as catheter sheath sets are crucial in interventional surgery.

[0003] At present, there are still some problems with the clinical use of catheter sheath sets, such as low positioning accuracy, lack of visualization, high friction coefficient, incompatibility with delivery system devices, single compatibility, inconvenient operation, etc. At present, most of the catheter sheath sets used clinically are separated and combined in the form of mechanical engagement between the dilator and the catheter sheath. This requires doctors to have a greater pulling force to separate the engagement structure to separate the dilator from the catheter sheath when withdrawing the dilator. In the case of the separation of the engagement structure, a strong force will act on the catheter sheath that has completed the establishment of the pathway. If the operation is improper, the catheter sheath may be displaced and the pathway may fail, or cause vascular damage, which brings great risks to the operation and the patient. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a medical catheter sheath assembly to at least solve the problem that the existing engaging structure may cause the catheter sheath to be displaced and cause passage failure when the dilator and the catheter sheath are separated by force.

[0005] The embodiment of the present invention provides the following technical solutions:

[0006] A medical catheter sheath assembly according to an embodiment of the present invention comprises a dilator and a catheter sheath connected to the dilator, wherein the dilator comprises a dilator seat and a dilator tube passing through the dilator seat, the catheter sheath comprises a catheter sheath seat and a sheath tube body passing through the catheter sheath seat, the dilator tube passes through the catheter sheath seat and the sheath tube body in sequence, and the medical catheter sheath assembly further comprises:

[0007] A plurality of protrusions, wherein the plurality of protrusions are arranged on the side wall of the expander seat along the circumference of the expander seat, and each of the protrusions is provided with a plurality of limiting protrusions;

[0008] A plurality of cover sheets, wherein the plurality of cover sheets are arranged on the catheter sheath seat along the circumference of the catheter sheath seat, and the plurality of cover sheets are provided with a plurality of grooves correspondingly, the plurality of grooves correspond to and are arranged in cooperation with the plurality of convex sheets, and the inner side wall of each of the grooves is provided with a plurality of limiting grooves, and the plurality of limiting grooves are arranged correspondingly with the plurality of limiting convex points arranged on the corresponding convex sheets;

[0009] When the dilator seat is rotated to rotate the protruding piece into the groove, the protruding piece drives the limiting protrusion into the corresponding limiting groove to sense that the dilator seat is connected to the catheter sheath seat.

[0010] Furthermore, the proximal and distal ends of the expansion tube are both provided with blood flow holes, and when the distal end of the expansion tube is penetrated through the sheath tube body, the blood flow holes at the distal end of the expansion tube are located outside the sheath tube body.

[0011] Furthermore, a sealing ring with an opening is provided at the proximal opening of the expansion tube, so as to prevent blood from gushing out from the proximal opening of the expansion tube when blood flows out through the blood flow hole.

[0012] Furthermore, the outer surface of the sheath tube body is provided with a scale for calculating the depth of the sheath tube body entering the body during surgery.

[0013] Furthermore, the arc-shaped transition setting of the distal edge of the sheath tube body is used to reduce the damage caused by the sheath tube body to the blood vessel.

[0014] Furthermore, a plurality of tactile protrusions are provided on the inner side wall of the distal opening of the sheath tube body for sensing whether the catheter inserted into the sheath tube body extends out of the sheath tube body.

[0015] Furthermore, the medical catheter sheath assembly further includes:

[0016] A connecting structure is arranged on both sides of the catheter sheath seat and is used to connect with other surgical instruments without replacing the catheter sheath.

[0017] Furthermore, the connection structure comprises:

[0018] Two clip elements are arranged on both sides of the catheter sheath seat, and a plurality of clips of different sizes are arranged on the side wall of each clip element. The clip elements are used to connect with other surgical instruments without replacing the catheter sheath.

[0019] Furthermore, the connection structure comprises:

[0020] Two slot elements are arranged on both sides of the catheter sheath seat, and the side walls of each slot element are provided with a plurality of slots of different sizes. The slot elements are used to connect with other surgical instruments without replacing the catheter sheath.

[0021] Furthermore, the dilation tube and / or the sheath tube body are both provided with a developable substance.

[0022] Compared with the prior art, in a medical catheter sheath assembly of the present invention, the dilator seat is connected to the groove on the cover plate on the catheter sheath seat through the convex piece. When the dilator and the catheter sheath are separated, it is only necessary to rotate the dilator seat without pulling with force, thereby solving the problem that the catheter sheath may be displaced and the passage fails when the dilator and the catheter sheath are separated with force in the existing snap-fit ​​structure.

[0023] Furthermore, when the protrusion is rotated into the groove, by rotating the limiting protrusion into the corresponding limiting groove, the staff can sense whether the dilator seat and the catheter sheath assembly are connected by whether the limiting protrusion enters the corresponding limiting groove, thereby making the intraoperative feedback more obvious and preventing the dilator from sliding and causing the dilator and the catheter sheath to separate by themselves. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a medical catheter sheath assembly according to an embodiment of the present invention;

[0025] Figure 2 is a side view of a dilator according to an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the structure of an expander seat according to an embodiment of the present invention;

[0027] Figure 4 A top view of an expansion tube according to an embodiment of the present invention;

[0028] Figure 5 It is a schematic structural diagram of a catheter sheath according to an embodiment of the present invention;

[0029] Figure 6 A bottom view of a cover sheet according to an embodiment of the present invention;

[0030] Figure 7 A side view of a sheath tube body according to an embodiment of the present invention;

[0031] Figure 8 It is a partial schematic diagram of the tube opening of the sheath tube body according to an embodiment of the present invention;

[0032] Fig. 9 FIG1 is an assembly diagram of a sheath tube, sheath seat and a connection structure according to an embodiment of the present invention;

[0033] Fig.10 FIG2 is an assembly diagram of a sheath tube, sheath seat and a connection structure according to an embodiment of the present invention;

[0034] The accompanying drawings of the present invention are as follows:

[0035] 10. dilator; 11. dilator seat; 12. dilator tube; 13. blood flow hole; 14. sealing ring;

[0036] 20. catheter sheath; 21. catheter sheath seat; 22. sheath tube body; 23. scale; 24. tactile bump; 25. side tube; 26. three-way valve;

[0037] 30. convex piece; 31. limiting convex point;

[0038] 40. Cover plate; 41. Groove; 42. Limiting groove;

[0039] 50. Connecting structure; 51. Clip element; 52. Clip; 53. Slot element; 54. Slot. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0041] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0043] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0044] Example 1

[0045] like Figure 1 As shown, a medical catheter sheath set provided in this embodiment includes a dilator 10 and a catheter sheath 20 connected to the dilator 10 .

[0046] like Figures 2 to 4 As shown, the expander 10 includes an expander seat 11 and an expansion tube 12 passing through the expander seat 11 .

[0047] The expander seat 11 can be set to be cylindrical, the distal end of the expansion tube 12 is set through the expander seat 11, and the proximal end of the expansion tube 12 and the distal end of the expansion tube 12 are located on both sides of the expander seat 11.

[0048] The distal end of the expansion tube 12 is configured to be conical in shape to facilitate insertion into a blood vessel.

[0049] The proximal end of the expansion tube 12 is the end close to the expander seat 11 after the expansion tube 12 is installed on the expander seat 11, and the distal end of the expansion tube 12 is the end away from the expander seat 11 after the expansion tube 12 is installed on the expander seat 11.

[0050] The expansion tube 12 and the expander seat 11 are connected by adhesive bonding or integrally formed by co-extrusion.

[0051] When the expansion tube 12 and the expander seat 11 are adhesively connected, the adhesive between the expansion tube 12 and the expander seat 11 can be any one or more of polyester, polyurethane, polyamide, α-cyanoacrylate, etc.

[0052] When the expansion tube 12 and the expander seat 11 are integrally formed by co-extrusion, the expansion tube 12 can be co-extruded with the same material or with multiple materials.

[0053] Among them, the material of the expansion tube 12 can be any one or more of HDPE (high-density polyethylene), PE (polyethylene), PC (polycarbonate), PP (polypropylene), PU (polyurethane), ABS (thermoplastic polymer material), LDPE (high-pressure polyethylene), TPU (thermoplastic polyurethane elastomer rubber), nylon, etc.

[0054] The material of the expander seat 11 can be any one or more of HDPE, PP, ABS, PC and the like.

[0055] like Figure 1 , 5 As shown, the catheter sheath 20 includes a catheter sheath seat 21 and a sheath tube body 22 passing through the catheter sheath seat 21 .

[0056] The connection between the catheter sheath seat 21 and the sheath tube body 22 may be an adhesive connection or other mechanical connection.

[0057] The material of the catheter sheath seat 21 can be any one or more of PC, TPE elastomer (thermoplastic elastomer), silicone rubber, nylon, etc.

[0058] like Figure 5 As shown, the catheter sheath 20 also includes a side tube 25 installed on the side of the catheter sheath seat 21, and a three-way valve 26 is provided on the side tube 25 to facilitate the injection, extraction and rinsing of liquid.

[0059] The side tube 25 may be made of any one or more of silicone, rubber, silicone rubber, TPU, etc.

[0060] The material of the three-way valve 26 can be any one or more of ABS, PC and the like.

[0061] Specifically, the expansion tube 12 can be installed through the catheter sheath seat 21 and the sheath body 22, and after the expansion tube 12 is installed through the catheter sheath seat 21 and the sheath body 22, the expander seat 11 and the catheter sheath seat 21 are close to each other for easy connection.

[0062] like Figure 3 , 5As shown in Figures 1 to 6, the medical catheter sheath assembly further includes a plurality of convex pieces 30 and a plurality of cover pieces 40. Among them, the plurality of convex pieces 30 are arranged on the side wall of the dilator seat 11 along the circumference of the dilator seat 11, and each convex piece 30 is provided with a plurality of limiting convex points 31; the plurality of cover pieces 40 are arranged on the catheter sheath seat 21 along the circumference of the catheter sheath seat 21, and the plurality of cover pieces 40 are correspondingly provided with a plurality of grooves 41, the plurality of grooves 41 correspond to and are arranged in cooperation with the plurality of convex pieces 30, and the inner side wall of each groove 41 is provided with a plurality of limiting grooves 42, and the plurality of limiting grooves 42 correspond to the plurality of limiting convex points 31 arranged on the corresponding convex piece 30; wherein, when the dilator seat 11 is rotated so that the plurality of convex pieces 30 are rotated into the plurality of grooves 41, the convex piece 30 drives the limiting convex points 31 to enter the corresponding limiting grooves 42, so as to sense whether the dilator seat 11 is connected to the catheter sheath seat 21 by whether the limiting convex points 31 and the limiting grooves 42 are connected.

[0063] The protruding piece 30 is a block with an arc-shaped cross section, so as to be easily rotated into the interior of the groove 41 .

[0064] The limiting protrusion 31 may be a hemispherical protrusion, so as to be easily rotated into the limiting groove 42 .

[0065] Preferably, the limiting protrusion 31 has a certain elasticity, so that it is easy to rotate into the limiting groove 42 under the drive of the protruding piece 30.

[0066] The cover plate 40 is an arc-shaped cover plate, which is installed on the top surface of the catheter sheath seat 21 , and a groove 41 is provided on the side facing the top of the catheter sheath seat 21 , and the groove 41 is provided corresponding to the protruding piece 30 .

[0067] The groove 41 is configured to be in an arc shape, so that the protruding piece 30 can easily enter the interior of the groove 41 when rotating.

[0068] Specifically, when the protruding piece 30 and the groove 41 correspond to each other in the horizontal direction, the protruding piece 30 can be rotated into the groove 41 driven by the expander seat 11 and drive the limiting protrusion 31 to enter the corresponding limiting groove 42 .

[0069] In some of the embodiments, the number of the limiting protrusions 31 is set to 1, and the number of the limiting grooves 42 can be multiple, so that the limiting protrusions 31 can enter different limiting grooves 42 to determine the matching connection between the dilator 10 and the catheter sheath 20.

[0070] In some of the embodiments, the number of the limiting protrusions 31 and the number of the limiting grooves 42 are both set to be multiple, so that the matching connection between the dilator 10 and the catheter sheath 20 can be judged according to the number of limiting protrusions 31 entering the limiting grooves 42.

[0071] By setting a limiting protrusion 31 on the protrusion 30 and using it in conjunction with the limiting groove 42, medical staff can sense the coordination between the dilator 10 and the catheter sheath 20 during the operation through the limiting protrusion 31 and the limiting groove 42. The limiting protrusion 31 and the limiting groove 42 can also play a limiting role to prevent the dilator 10 from loosening or sliding left and right during the operation to cause risks.

[0072] like Figure 2 As shown, the proximal and distal ends of the expansion tube 12 are both provided with blood flow holes 13 , and when the distal end of the expansion tube 12 is penetrated through the sheath tube body 22 , the blood flow holes 13 at the distal end of the expansion tube 12 are located outside the sheath tube body 22 .

[0073] When the expansion tube 12 is inserted into the expander seat 11 , the blood flow holes 13 opened at the proximal and distal ends of the expansion tube 12 are located on both sides of the expander seat 11 .

[0074] Specifically, by opening the blood flow holes 13 at both the distal end and the proximal end of the dilation tube 12 , blood can flow out through the blood flow holes 13 during surgery.

[0075] Preferably, a blood flow hole 13 is opened at the proximal end of the expansion tube 12, and a blood flow hole 13 is opened at the distal end of the expansion tube 12. When the expansion tube 12 is inserted into the sheath body 22, the blood flow hole 13 at the distal end of the expansion tube is located outside the sheath body 22.

[0076] like Figure 4 As shown, a sealing ring 14 with an opening is provided at the proximal opening of the expansion tube 12 to reduce the blood flow rate when blood flows out through the blood flow hole 13 and prevent blood from gushing out violently from the proximal opening of the expansion tube 12.

[0077] The sealing ring 14 may be made of one or more of silicone, latex, silicone rubber, and polyurethane.

[0078] like Figure 5 , 7 As shown, the outer surface of the sheath tube body 22 is provided with a scale 23 for calculating the depth of the sheath tube body 22 entering the patient's body so as to facilitate positioning of the instrument during surgery.

[0079] Specifically, by providing a scale 23 on the outer surface of the sheath tube body 22, the position of the arterial opening can be more accurately located, the subsequent access products can be positioned, and the depth of these access devices entering the body can be estimated.

[0080] Furthermore, the edge of the distal side wall of the sheath tube body 22 is provided with an arc-shaped transition to reduce vascular damage during surgery.

[0081] Preferably, the edge of the distal side wall of the sheath tube body 22 is configured as a conical surface to better transition the dilator 10 to the sheath tube body 22 and reduce damage to the blood vessel during surgery.

[0082] like Figure 8 As shown, a plurality of tactile protrusions 24 are provided on the inner side wall of the distal opening of the sheath tube body 22 for sensing whether the catheter inserted into the sheath tube body 22 extends out of the sheath tube body 22 .

[0083] The tactile bumps 24 are circular tactile bumps 24 .

[0084] Among them, after a circular tactile bump 24 is set at the tube mouth of the sheath body 22, medical staff can sense and provide feedback on whether the dilator 12 or other catheter extends out of the sheath body 22, so as to make it more convenient for medical staff to position the dilator 12 or other catheters. At the same time, it also prevents the dilator 10 or other catheters from causing complications such as pseudoaneurysms to the blood vessels due to misoperation.

[0085] The thickness of the tactile bumps 24 is in the range of 0.01 to 0.5 mm.

[0086] Specifically, when the dilation tube 12 or other catheter passes through the sheath body 22, the tactile protrusion 24 can have a slight blocking effect on the dilation tube 12 or other catheter, but does not affect the passage of the dilation tube 12 or other catheter. Therefore, when the medical staff inserts the dilation tube 12 or other catheter into the sheath body 22, if they feel a slight blocking effect, it means that the dilation tube 12 or other catheter has reached the edge of the tube opening of the sheath body 22. After continuing to insert the dilation tube 12 or other catheter and no blocking effect is felt, it means that the dilation tube 12 or other catheter has extended out of the sheath body 22.

[0087] The working principle of this embodiment is as follows:

[0088] When the dilator 10 and the catheter sheath are used in combination, the distal end of the dilator tube 12 is inserted through the sealing ring 14 of the catheter sheath seat 21. After the dilator tube 12 is pushed to the specified position, the dilator seat 11 is rotated to make the protruding piece 30 engage with the groove 41 on the cover plate 40 through radial force;

[0089] When the protruding piece 30 rotates into the groove 41 , the protruding piece 30 is further rotated to make the limiting protrusion 31 enter the corresponding limiting groove 42 , and make the blood flow hole 13 at the distal end of the expansion tube 12 located outside the conical surface of the sheath tube body 22 .

[0090] The separation and combination structure of the catheter sheath group of the embodiment of the present invention does not require additional axial force during operation, is easy to operate, does not cause displacement of the catheter sheath during surgery, reduces the risk of surgery, and the coordinated use of the limiting protrusions and the limiting grooves also makes the feedback during surgery more obvious, and also prevents the dilator from sliding. The embodiment of the present invention can assist in positioning the sheath body during surgery by designing the opening of the expansion tube and setting scale markings on the sheath body, and the tactile protrusions set at the mouth of the sheath body can also enable medical staff to sense that the expansion tube or other access instruments are extended out of the sheath body, preventing other access instruments from causing secondary damage to the blood vessels.

[0091] Example 2

[0092] This embodiment is a variation of Embodiment 1.

[0093] like Figures 9-10 As shown, the medical catheter sheath set also includes a connection structure 50 , which is disposed on both sides of the catheter sheath seat 21 and is used to connect with other surgical instruments without replacing the catheter sheath 20 .

[0094] Specifically, the connection structure 50 can be used in conjunction with other delivery system instruments of various sizes, and there is no need to replace the catheter sheath 20 to adapt to other surgical instruments during surgery.

[0095] In some of the embodiments, the connecting structure 50 includes two clip elements 51, which are arranged on both sides of the catheter sheath seat 21, and a plurality of clips 52 of different sizes are arranged on the side walls of each clip element 51. The clip elements 51 are used to connect with other surgical instruments without replacing the catheter sheath 20.

[0096] Specifically, the clip element 51 includes a first mounting plate, which is fixedly disposed on the side wall of the catheter sheath seat 21, and a plurality of clips 52 of different sizes are disposed on the side wall of the first mounting plate.

[0097] The clip 52 is a male clip 52 structure.

[0098] The plurality of clips 52 of different sizes are clips 52 of different lengths and / or heights, and the plurality of clips 52 are sequentially arranged on the side wall of the first mounting plate from small to large.

[0099] The clip 52 may be configured as a rectangular parallelepiped structure.

[0100] In some of the embodiments, the connecting structure 50 includes two slot elements 53, which are arranged on both sides of the catheter sheath seat 21, and the side walls of each slot element 53 are provided with a plurality of slots 54 of different sizes. The slot elements 53 are used to connect with other surgical instruments without replacing the catheter sheath 20.

[0101] The connection structure 50 further includes a second mounting plate, which is fixedly mounted on the side wall of the catheter sheath seat 21 , and a plurality of slots 54 of different sizes are arranged on the side wall of the second mounting plate.

[0102] The card slot 54 is a female card slot 54 structure.

[0103] The plurality of slots 54 of different sizes are slots 54 of different lengths and / or heights, and the plurality of slots 54 are sequentially arranged on the side wall of the second mounting plate from small to large.

[0104] The catheter sheath assembly of this embodiment is compatible with the use of various delivery system instruments, and by setting the male clamp and the female slot to different sizes, there is no need to replace the catheter sheath when performing multiple surgeries at the same time, which facilitates the operation and reduces damage to the patient.

[0105] Example 3

[0106] This embodiment is a variation of Embodiment 1 or Embodiment 2.

[0107] The dilation tube 12 and / or the sheath tube body 22 are both provided with a developable substance so that the dilation tube 12 and the sheath tube body 22 can be developed under ultrasound or X-rays, thereby facilitating the doctor's operation and improving positioning accuracy and surgical success rate.

[0108] The developable substance can be mixed with the particles and co-extruded to form the expansion tube 12 or the sheath tube body 22; it can also be made into a certain shape, such as a ring shape.

[0109] Among them, the developable material can be any one or more of BaSO4 (barium sulfate), bismuth-containing materials, tungsten-containing materials, iodine-containing materials, magnesium stearate, EBS (ethylene bisstearylamide), platinum, gold, tantalum, etc.

[0110] Among them, the bismuth-containing substances may include bismuth basic carbonate, bismuth oxychloride, bismuth trioxide, bismuth subcarbonate, and the like.

[0111] Among them, tungsten-containing substances include tungsten powder, calcium tungstate and the like.

[0112] Among them, iodine-containing substances include triiodophenol, iohexol, etc.

[0113] In some of the embodiments, the main materials of the expansion tube 12 and / or the sheath tube body 22 are TPU and PTFE, so that the tube material of the expansion tube 12 and / or the sheath tube body 22 is softer, thereby improving the smoothness of the expansion tube 12 and / or the sheath tube body 22, so that the expansion tube 12 and / or the sheath tube body 22 can pass through tissues and blood vessels more smoothly, reducing damage to blood vessels.

[0114] Among them, BaSO can be deposited in the expansion tube 12 and / or the sheath tube body 22. 4 , so that the dilation tube 12 and the sheath tube body 22 can be visualized under X-rays.

[0115] In some of the embodiments, the main material of the dilation tube 12 and / or the sheath tube body 22 is HDPE to improve the toughness of the dilation tube 12 and / or the sheath tube body 22 so as to facilitate the dilation tube 12 and / or the sheath tube body 22 to pass through the calcified blood vessels.

[0116] In some of the embodiments, a bismuth-containing substance or calcium tungstate is deposited in the raw materials of the expansion tube 12 and / or the sheath tube body 22 so that the expansion tube 12 and / or the sheath tube body 22 can be visualized not only under X-rays but also under ultrasound.

[0117] In some embodiments, the main material of the sheath tube body 22 is a combination of a PTFE (polytetrafluoroethylene-containing polymer chemical material) lining, a steel mesh and a polymer layer. The raw material of the steel mesh can be any one or more of 304 stainless steel, 316 stainless steel, etc., and the polymer layer can be any one or more of nylon, FEP (fluorinated ethylene propylene copolymer), and PVC (polyvinyl chloride).

[0118] Among them, since PTFE has extremely small surface tension, does not adhere to any substance and has low resistance, it is conducive to the smooth passage of the dilator 10 in the inner cavity of the sheath tube; the steel wire mesh of the sheath tube body 22 strengthens the tube body structure, making the sheath tube have excellent anti-bending properties.

[0119] In the process of preparing the steel wire mesh, metal powders such as tungsten, platinum, and tantalum can be blended so that the tube body can be developed under X-rays.

[0120] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0121] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A medical catheter sheath assembly, comprising a dilator and a catheter sheath connected to the dilator, wherein the dilator comprises a dilator seat and a dilator tube passing through the dilator seat, the catheter sheath comprises a catheter sheath seat and a sheath tube body passing through the catheter sheath seat, the dilator tube passing through the catheter sheath seat and the sheath tube body in sequence, It is characterized in that The medical catheter sheath set also includes: A plurality of protrusions, wherein the plurality of protrusions are arranged on the side wall of the expander seat along the circumference of the expander seat, and each of the protrusions is provided with a plurality of limiting protrusions; A plurality of cover sheets, wherein the plurality of cover sheets are arranged on the catheter sheath seat along the circumference of the catheter sheath seat, and the plurality of cover sheets are provided with a plurality of grooves correspondingly, the plurality of grooves correspond to and are arranged in cooperation with the plurality of convex sheets, and the inner side wall of each of the grooves is provided with a plurality of limiting grooves, and the plurality of limiting grooves are arranged correspondingly with the plurality of limiting convex points arranged on the corresponding convex sheets; A plurality of tactile protrusions are provided on the inner side wall of the distal opening of the sheath tube body for sensing whether the catheter inserted into the sheath tube body has extended out of the sheath tube body; The proximal and distal ends of the expansion tube are both provided with blood flow holes, and when the distal end of the expansion tube is penetrated through the sheath tube body, the blood flow holes at the distal end of the expansion tube are located outside the sheath tube body; A sealing ring with an opening is provided at the proximal opening of the expansion tube, which is used to prevent blood from gushing out from the proximal opening of the expansion tube when blood flows out through the blood flow hole; When the dilator seat is rotated to rotate the protruding piece into the groove, the protruding piece drives the limiting protrusion into the corresponding limiting groove to sense that the dilator seat is connected to the catheter sheath seat.

2. The medical catheter sheath assembly according to claim 1, It is characterized in that The outer surface of the sheath tube body is provided with a scale for calculating the depth of the sheath tube body entering the body during surgery.

3. The medical catheter sheath assembly according to claim 1, It is characterized in that The arc-shaped transition setting of the distal edge of the sheath tube body is used to reduce the damage caused by the sheath tube body to the blood vessel.

4. The medical catheter sheath assembly according to any one of claims 1 to 3, It is characterized in that The medical catheter sheath set also includes: A connecting structure is arranged on both sides of the catheter sheath seat and is used to connect with other surgical instruments without replacing the catheter sheath.

5. The medical catheter sheath assembly according to claim 4, It is characterized in that The connection structure comprises: Two clip elements are arranged on both sides of the catheter sheath seat, and a plurality of clips of different sizes are arranged on the side wall of each clip element. The clip elements are used to connect with other surgical instruments without replacing the catheter sheath.

6. The medical catheter sheath assembly according to claim 4, It is characterized in that The connection structure comprises: Two slot elements are arranged on both sides of the catheter sheath seat, and the side walls of each slot element are provided with a plurality of slots of different sizes. The slot elements are used to connect with other surgical instruments without replacing the catheter sheath.

7. The medical catheter sheath assembly according to claim 1, It is characterized in that The dilation tube and / or the sheath tube body are both provided with a developable substance.

Images