JP5112466B2 - Catheter system - Google Patents

Description

The present invention relates to a vascular catheter, and more particularly to a vascular catheter for sucking and removing unnecessary substances such as thrombus in a blood vessel or injecting a drug solution into a blood vessel.

  Conventionally, blood vessel catheters have been used to remove thrombus and the like. When an operator inserts a blood vessel catheter into a blood vessel, the operator moves the blood vessel along the blood vessel to reach the treatment site and sucks and removes the thrombus. For example, Patent Document 1 discloses a suction catheter with a dilator, which is a double-tube structure consisting of a central catheter and an outer catheter of approximately the same diameter and length, and usually removes thrombus and the like through the central catheter. When the central catheter is plugged with a thrombus or the like, the central catheter can be easily pulled out from the outer catheter, and can be replaced with another central catheter. Further, the outer catheter alone functions as a catheter and can suck a thrombus and the like. However, the central catheter of the catheter of Patent Document 1 has a dilator, and such a device reduces the tube diameter, and further, there is a bendable conical tip at the end of the dilator, and this end is the thinnest in the catheter. It becomes a part, and the rate of suction is limited.

Patent Document 2 is formed of a guide catheter for sucking and removing a thrombus and an evacuation sheath that is located inside the distal end and forms a thrombus suction port, and a blood vessel is formed by a balloon provided outside the sheath. A catheter device is disclosed in which a thrombus is sucked by blocking the blood flow to generate a reverse blood flow to prevent the thrombus debris from spreading and the thrombus debris from being clogged with another blood vessel. However, in the combination of the guide catheter and the evacuation sheath in Patent Document 2, the guide catheter and the evacuation sheath are sealed with a balloon, and the evacuation sheath that sucks the thrombus against the outer diameter of the guide catheter is used. The viewpoint that the outer diameter of the evacuation sheath, which becomes the inner diameter of the guide catheter, is made as close as possible to the inner diameter of the guide catheter is not disclosed.
Moreover, since the catheter apparatus of patent document 2 expands a balloon and aspirates thrombus etc., it cannot move a catheter back and forth, attracting | sucking. For this reason, when removing a thrombus existing in a wide area, it takes a long time, and a frequent and complicated operation of repeatedly moving the catheter device and sucking the thrombus is required.

JP-A-7-24058 WO02 / 087677

  A vascular catheter is a medical instrument that is used by being inserted into a blood vessel and is guided to an affected area in the blood vessel by a guide wire or the like, and treats the inner wall of the blood vessel or the inside of the blood vessel, and usually has a very thin outer diameter such as 1 mm or less. There is a need. In addition, when aspirating and removing thrombus deposited on the inner wall of a blood vessel, these viscosities are high. There was a problem of calling. Moreover, in the conventional suction catheter, since suction was normally provided on the extension on the proximal side of the catheter, it was impossible to avoid applying suction resistance over the entire length of the catheter.

  However, due to the nature of being inserted into a blood vessel, there is a limit to increasing the outer diameter of the catheter, and it is virtually impossible to make it thicker than conventional catheters. Therefore, there has been a demand for a catheter capable of quickly removing a thrombus and the like in a short time while keeping the suction pressure as low as possible. Furthermore, when the catheter described in Patent Document 2 is used to fix and suck the catheter to the inner wall of the blood vessel, it is necessary to repeat the fixing and moving, and thus it is difficult to quickly remove a wide range of thrombus and the like. In addition, viscous thrombus adheres to a wide range of blood vessel walls in the blood vessel, so it takes a long time to remove with the above catheter, and frequent operation is required. A catheter that can reduce the burden on the patient has been desired.

  In order to solve such a problem, the present invention arranges the tubular element on the distal end side in the catheter shaft and secures the suction inner diameter as close as possible to the outer diameter of the catheter and the proximal end side of the tubular member of the catheter shaft. Then, the catheter shaft itself is used as a suction tube, and a Y connector is provided at the proximal end of the tubular member of the catheter shaft, and the thrombus is sucked from the branch port of the Y connector through the suction delivery means, whereby the proximal side of the catheter The suction speed is improved by shortening the length that receives the suction resistance due to the catheter diameter compared with the case where suction is provided on the extension of the thrombus, etc. while moving inside the blood vessel without using a balloon, etc. The present invention relates to a blood vessel catheter that can remove and remove blood clots in a wide range of blood vessels quickly.

  That is, the present invention is a catheter device for injecting a substance such as a drug into a blood vessel and / or removing unnecessary substances in the blood vessel outside the body, the catheter device having a catheter element and a catheter shaft, The catheter element has a flexible shaft having a distal end and a proximal end, and a tubular element connected to the distal end of the flexible shaft, the lumen of the proximal end of the tubular element being the catheter shaft The present invention relates to a catheter device and a catheter element used in the catheter device.

  The catheter element constituting the catheter device of the present invention includes a flexible shaft having a distal end and a proximal end, a tubular element connected to the distal end of the flexible shaft, and a proximal end of the flexible shaft. A hub connected to the end has a lumen at the proximal end of the tubular element in communication with the tubular member of the catheter shaft. The flexible shaft is the shaft connecting the tubular element and the operating hub. The cross-sectional shape is not particularly limited, but a round bar shape, an arc shape obtained by extending a part of the tube wall of the tubular element, and the like are preferable, and a bar shape having a low directivity for bending is particularly preferable. Further, it may be solid or tubular. In the case of a tubular shape, a tubular element and a treatment instrument can be inserted into the blood vessel through the operation hub and the flexible shaft.

  The flexible shaft connects to the proximal end of the tubular element and is used to move the position of the tubular element within the tubular member of the catheter shaft, but at the position of the catheter shaft where the flexible shaft is inserted, It is important that the lumen for sucking the thrombus of the tubular element communicates with the inner space of the catheter shaft. Various methods can be considered as the communication means. When a flexible shaft having a sufficiently small outer diameter with respect to the inner space of the catheter shaft is used, the tubular element having substantially no space inside the flexible shaft is used. Although it is advantageous for back-and-forth movement, a space may be provided inside the flexible shaft. In this case, the interior space of the tubular element is mainly in communication with the space between the exterior of the flexible shaft and the interior of the catheter shaft. Further, in the case where the outer diameter of the flexible shaft is approximately the same as the inner space of the catheter shaft, a space for suction or injection is provided inside the flexible shaft. In this case, it is necessary that the space inside the flexible shaft and the inner space of the catheter shaft communicate with each other by means of, for example, a slit, a notch, a hole, a mesh, etc. And communicates with the space between the outside of the flexible shaft and the inside of the catheter shaft. The length of the flexible shaft is usually 20 cm to 200 cm, but 30 cm to 130 cm is particularly desirable. The material of the flexible shaft can be composed of flexible plastic, metal, etc., for example, polyethylene, polyurethane, nylon, nylon elastomer, EVA, PI, PC, PS, POM, AS, m-PPE PVC, PMMA, PET, PBT, etc. may be used, or a combination thereof may be used. Preferably, a metal material such as stainless steel or a superelastic alloy (Ni-Ti alloy) can be used. It is also possible to use a composite material in which a metal is used as a core material and a polymer is coated on the outside.

  The hub is not limited in its shape unless it is inconvenient to operate the flexible shaft at hand. However, if the hub is too large or heavy, the catheter element may move out of the clean area. Absent. When a space is provided in the flexible shaft, the hub can be provided with a hole communicating with the space. A medical luer taper or a medical double thread mechanism can be provided to connect to other devices. The material can be polyethylene, polyurethane, nylon, nylon elastomer, EVA, PI, PC, PS, POM, AS, m-PPE, PVC, PMMA, PET, PBT, etc. Also good.

  The tubular element in the catheter element is usually 3 cm to 50 cm long, but is preferably 5 cm to 20 cm. The outer diameter is defined by the size of the catheter shaft used. The tubular element is used by inserting it into the catheter shaft. However, the inner diameter of the catheter shaft is sufficiently large so that blood sucked from the suction end of the catheter element and the liquid medicine to be injected do not leak from the gap between the tubular element and the catheter shaft. The outer diameter of the tubular element is required to be close to, but on the other hand, it may be performed while moving the catheter element in the front-rear direction during the suction or infusion operation, so it may have a slight clearance that does not hinder its movement is important. Specifically, a clearance of 0.02% or more and 25% or less and further 0.1 or more and 15% or less of the outer diameter of the catheter shaft to be used is required. The wall thickness of the tubular element is made in the range of 0.02 mm to 2 mm.

  In addition, the distal and proximal ends of the tubular element are shaped as if they were cut diagonally so that the catheter element can be smoothly inserted into or removed from the catheter shaft connection or into the blood vessel and will not be caught. It is preferable to make it. The angle is 5 ° to 70 °, further 20 ° to 50 ° with respect to the longitudinal direction. The cut shape may be a single straight line, a complex combination of a plurality of straight lines, or a shape that draws a gentle arc. The material of the tubular element may be a single material or a composite material. As the single material, polyethylene, nylon, nylon elastomer, polyurethane, fluororesin, EVA, silicon resin, or the like can be used. For composite materials, use a two-layer structure with fluorine resin, polyamide, polyamide elastomer or polyethylene resin for the inner layer and polyethylene, polyurethane, nylon, nylon elastomer, EVA, silicon resin, etc. for the outer layer. Can do. It is also possible to provide a metal or resin blade (a net-like or spiral reinforcement) between the inner layer and the outer layer.

  Further, in order to visually prevent the tubular element from coming out of the position of the suction end of the tubular element and from the catheter shaft, X-rays are respectively applied to the cut end of the tubular element before the suction end side and the cut end opposite to the suction end. An impermeable marker can be provided. Either marker may be used as needed. The marker is applied to the surface, the inner surface, or the wall thickness of the tubular element such as a tube, a coil, a paint, or a powder. Further, a radiopaque material may be mixed into the entire tubular element so that the entire tubular element can be confirmed under X-rays. Any material can be used as long as it is opaque to X-rays, but contrast materials such as stainless steel, platinum, platinum, tungsten, or alloys thereof, and bismuth carbonate, bismuth oxide, and barium sulfate can be used.

  The outer surface of the tubular element can be subjected to a surface treatment having a lubricating performance in order to reduce resistance when inserted into the catheter shaft or moving in the blood vessel. The surface treatment agent is optional, but for example, a fluororesin or silicon which is a hydrophobic substance may be added, and polyethylene glycol (PEG), polyethylene oxide (PEO), polyvinyl alcohol, polyacrylamide and methacrylic acid homogen A hydrophilic substance such as a polymer or copolymer may be applied to the surface. Furthermore, it can be applied to the inner surface of the catheter shaft as well as the surface of the tubular element in order to produce a lubricating action.

  A thrombus or the like in the blood vessel is sucked from the distal end of the tubular element, transferred from the proximal end of the tubular element into the catheter shaft, and sucked and removed by the suction device from the Y connector through the branch pipe.

  Although the lumen of the tubular element can be used as a guidewire passage, it is preferable to provide a guidewire passage independently in the tubular element. In this case, the position of the guide wire passage can be provided at any position with respect to the tubular element. On the other hand, it can be provided only on the suction end side. The guide wire passage may be provided so as to protrude outside the outer diameter of the tubular element, but the cross-section of the tubular element is kept as circular as possible to prevent blood from flowing into and out of the catheter shaft. Preferably, it is provided in the inner wall surface of the tubular element or in the tubular element. The material of the guide wire passage may be the same as that of the tubular element, and may be formed integrally with the tubular element, but may be formed separately or partly or entirely of the tubular element. It is also possible to provide in the inner space. The inner diameter of the guide wire passage is appropriately selected according to the diameter of the guide wire to be used, but is about 0.1 to 3 mm. The guide wire passage may be provided in the flexible shaft, may be provided separately from the flexible shaft, or may not be provided particularly after exiting the proximal end of the tubular element.

  In order to stably operate the catheter element along the guide wire, the guide wire passage may form a conduit projecting from the tubular element toward the suction end side, and the protruding length is 0.3 mm or more and 10 mm. The following is appropriate, and 0.5 mm to 4 mm is more preferable. Further, the length of the guide wire passage is 5 mm to 500 mm, particularly 10 mm to 5 mm, assuming that the guide wire including the length protruding from the tubular element to the suction end side is a portion where the guide wire is held inside. It is preferable that it is 300 mm.

  The cross-sectional shape of the guide wire passage is preferably circular, and the inner diameter thereof is 0.1 mm to 3 mm, but is particularly preferably 0.3 mm to 1 mm when used for a coronary artery. The wall thickness when the guide wire passage is formed as a member independent of the tubular element is 0.02 mm to 2 mm, particularly 0.05 mm to 0.25 mm when used for a coronary artery. In this case, the material may be a single material or a composite material. As the single material, polyethylene, nylon, nylon elastomer, polyurethane, fluororesin, EVA, silicon resin, or the like can be used. In the case of a composite material, fluorine resin, polyamide, polyamide elastomer or polyethylene resin can be used for the inner layer, and polyethylene, polyurethane, nylon, nylon elastomer, EVA, silicon resin, or the like can be used for the outer layer.

  When the distal tip of the guide wire passage is formed independently of the tubular element, it is preferable to provide lubrication performance by applying a surface treatment in order to reduce resistance when inserted into the catheter shaft or blood vessel. . There are various surface treatment methods. For example, it can be treated with a hydrophobic resin such as fluororesin or silicon, such as polyethylene glycol (PEG), polyethylene oxide (PEO), polyvinyl alcohol, polyacrylamide and methacrylic. It is also possible to treat the surface with a hydrophilic substance such as an acid homopolymer or copolymer.

  If the position of the flexible shaft can be grasped by X-ray contrast, the safety becomes higher. In particular, when a resin material is used, the above-described contrast object can be mixed with the material. An X-ray opaque marker can be provided on the protruding portion of the guide wire passage on the suction end side to indicate the position of the tip end side of the suction end and the position of the protruding portion. A marker, such as a tube, coil, paint, or powder, is applied to the surface, inner surface, or thickness of the flexible shaft. Materials that are opaque to the X-rays described above can be used, and these may be used in combination.

  As the guide wire, a commercially available product can be used, and the thickness of the guide wire can be selected depending on the site of the blood vessel in which the catheter is used. For example, guidewires with a thickness of 0.012 ", 0.014", 0.018 ", 0.025", 0.035 ", etc. are commercially available for blood vessels. For example, used for coronary arteries of the heart In this case, a guide wire having a thickness of 0.014 "is often used. There are also various lengths, ranging from about 30 cm to about 300 cm. Similarly, for coronary arteries, 175 cm to 190 cm or 300 cm is common. The structure is various, but generally the end on the side that precedes the body is designed to be soft so as not to pierce the blood vessel. A coil made of a metal such as stainless steel throughout its length, a metal but a coil provided only on the tip side 30 cm preceding the body, stainless steel and a superelastic alloy (Ni-Ti material) Those using a composite, those coated with polyurethane or nylon polymer, etc. can be purchased. The guide wire is manipulated to guide the catheter within the blood vessel.

  The catheter shaft of the present invention is a tube having a substantially uniform cross-sectional shape and a uniform cross-sectional area, and includes a tubular member and a connector for connecting to a connecting portion. When the catheter shaft is used as a vascular catheter, a tubular element is placed in the catheter shaft as described above. The tubular element can protrude from the distal end of the catheter shaft, but the proximal end of the tubular element is always retained within the tubular member of the catheter shaft. As the catheter shaft, a commercially available guiding catheter or a diagnostic contrast medium injection catheter or the like can be used. Commercially available products have an outer diameter of 3 Fr. to 10 Fr., and an effective length of about 90 cm to 120 cm, and the distal end that precedes the body is curved into various shapes so that the catheter is stable in the blood vessel. There are various shapes with a mark. For example, Judkins Left, Judkins Right, Amp Lats Right, Amp Lats Left, Border, Multipurpose, Kimney, Champ and the like can be mentioned.

  It is also possible to use a dedicated catheter shaft. In this case, the structure of the catheter shaft has a tubular member on the distal end side of the catheter shaft having a distal end and a proximal end, and the proximal end is connected to a connecting portion. There is a connector. The tubular member of the catheter shaft has an outer diameter of 0.3 mm to 12 mm, and an outer diameter of 1 mm to 3.5 mm is suitable for coronary arteries. The wall thickness is 0.03 mm to 2 mm, but 0.05 mm to 0.8 mm is suitable for coronary arteries. The material can be a single material, but it can also be a composite material. The single material is polyethylene, nylon, nylon elastomer, polyurethane, fluororesin (FEP, PTFE, PFA, PVDF, etc.), stainless steel As a composite material such as a tube or a superelastic alloy (Ni-Ti alloy), a fluorine resin, polyamide, polyamide elastomer or polyethylene resin can be used for the inner layer, and polyethylene, polyurethane, nylon, nylon elastomer or the like can be used for the outer layer. Further, in order to improve the kink resistance and shape retention of the tube between the inner layer and the outer layer, it is desirable to provide a metal blade (net-like or spiral reinforcing material) or a resin blade.

The inner diameter of the tubular member of the catheter shaft is approximately equal to the outer diameter of the tubular element, but can accommodate the tubular element. The overall hardness of the tubular member may be uniform, but it may be configured by changing the hardness gently without any boundary. Moreover, it is also possible to change in steps with two or more steps of hardness. As an example of changing the hardness, a constant hardness portion and a constant hardness portion are provided on the hand side, and a hardness change portion that gradually becomes flexible from the constant hardness portion toward the tip is provided on the tip side. it can. Usually, the length of the hardness changing portion is preferably 35% or less of the effective length of the catheter shaft, which is the total length of the constant hardness portion and the hardness changing portion. The effective length of the catheter shaft is usually 70 to 130 cm.
The material of the tubular member of the catheter shaft may be a single material or a composite material. As the single material, polyethylene, nylon, nylon elastomer, polyurethane, fluororesin, EVA, silicon resin, or the like is used. In the case of a composite material, fluorine resin, polyamide, polyamide elastomer or polyethylene resin can be used for the inner layer, and polyethylene, polyurethane, nylon, nylon elastomer, EVA, silicon resin, or the like can be used for the outer layer. It is also possible to provide a metal or resin blade between the inner layer and the outer layer.

  The connector is used for manipulating the catheter shaft itself and for connecting to the connecting portion, and preferably has a space inside that maintains a diameter larger than the outer diameter of the tubular element. The outer shape can be arbitrarily designed in consideration of ease of holding and connectivity with the connecting portion, but is preferably light in weight to prevent the catheter shaft from falling from the patient. As the material, PC, PS, POM, AS, m-PPE, PVC, PMMA, PET, PBT, or the like can be used.

  In order to reduce the resistance when the catheter shaft is inserted into the blood vessel, a surface treatment for imparting lubricating performance can be applied. Surface treatment methods include, for example, a method of coating with a hydrophobic fluororesin or silicon, hydrophilic polyethylene glycol (PEG), polyethylene oxide (PEO), polyvinyl alcohol, polyacrylamide and methacrylic acid homopolymer or Examples thereof include a method of coating with a copolymer.

  The Y connector as a connecting part for connecting to the catheter shaft is used to separate the flexible shaft and the guide wire from the suction device and connect them to the outside. Usually, the flexible shaft and the guide wire are connected to the main tube. The connection with the suction device through the mouth depends on the branch pipe mouth, but it works even if it is used in reverse.

  The suction device in the present invention is not particularly limited. For example, a syringe-type suction device, a suction device using a suction pump, and the like can be used.

  FIG. 1 shows an embodiment of the catheter device 1 of the present invention used for insertion into a blood vessel and sucking a thrombus or the like or injecting a drug solution into the blood vessel. The whole shows the catheter device 1 and shows a state in which the catheter element 13 is inserted into the tubular member 4 of the catheter shaft. As shown in FIG. 2, the catheter element 13 includes a tubular element 3 and a flexible shaft 6, a hub 7, and a guide wire passage 10 shown in FIG. 3. The connecting portion between the tubular element 3 and the flexible shaft 6 is a catheter shaft. The tubular member 4 is not shown. In FIG. 1, the connecting portion 5 is constituted by a Y connector, and a flexible shaft 6 communicates with the main pipe 11. Here, the flexible shaft 6 has a round bar shape. The guide wire 2 can also be passed through the main pipe 11, and the route of the main pipe 11 is taken from the Y connector in FIG. A suction device 8 is connected to the branch pipe 12.

  The distal end of the guide wire 2 protrudes from the tubular element 3 and the guide wire passage 10 and its proximal end protrudes from the Y connector. A suction end 9 is open at the distal end of the tubular element 3.

  An example of an actual use example of the vascular catheter device 1 of the present invention will be described below. First, a small hole is made in the skin from an access site of the body, for example, the groin or wrist near the thigh root, to the artery. A guide wire 2 that is commercially available through a hemostasis valve of this sheath introducer and a tubular member 4 of a catheter shaft in which the guide wire 2 is placed inside is secured by a sheath introducer generally called Advance to the front of the site.

  In the vicinity of the target site, only the guide wire 2 is advanced in advance to secure a treatment route. When the positions of the guide wire 2 and the tubular member 4 of the catheter shaft are determined, the guide wire 2 is passed through the guide wire passage 10 of the present catheter element, and the distal end of the guide wire 2 and the distal end of the tubular member 4 of the catheter shaft. The suction end 9 of the catheter element 13 is advanced to the vicinity of the site where there is an object such as a thrombus between the parts. The guide wire 2 is inserted further beyond the catheter element 13 so that the guide wire 2 does not come out immediately. In addition, the hemostasis valve built in the main pipe 11 side of the connecting portion 5 is lightly closed to minimize blood leakage. Furthermore, necessary parts such as an extension tube and a stopcock are attached to the branch pipe 12 of the connecting portion 5, and the suction device 8 is connected to the proximal end thereof. When the preparation of the catheter device 1 is completed, a negative pressure is applied using the suction device 8 when sucking a thrombus and the like, and a positive pressure is applied by filling the necessary chemical solution into the suction device 8 when injecting a chemical solution or the like. Add While the negative pressure or the positive pressure is applied to the catheter element 13, the catheter element 13 is moved through the blood vessel of the target site, and a thrombus is aspirated or a medical solution is injected.

  The catheter element 13 has a flexible shaft 6 connected to the proximal end side of the tubular element 3 having a space communicating between the distal end and the proximal end as shown in FIGS. A hub 7 is provided on the proximal side of the flexible shaft 6. On the other hand, the tubular element 3 is provided with a guide wire passage 10 for allowing the guide wire 2 to pass therethrough, and a radiopaque marker is provided on the distal end side of the guide wire passage 10.

  The shape of the flexible shaft 6 is arbitrary. For example, it may be a solid cylindrical shaft as shown in FIG. 5, or may be a hollow cylindrical shaft as shown in FIG. Is possible. Furthermore, since the flexible shaft on the proximal side of the proximal end of the tubular element on the inner side of the catheter shaft only has to communicate with the inner space of the tubular member 4 of the catheter shaft and the inner space of the tubular element 3 of FIG. As described above, the flexible shaft 6 has a size close to the inner diameter of the tubular member 4 of the catheter shaft, and a hole or a slit is provided in the whole or a part thereof so that the inner space of the catheter shaft 4 communicates with the inner space of the tubular element. It can also be shaped.

  Various forms can be considered as the communication means. For example, FIG. 11 shows a case where one or more slits are provided in a part or the whole of the flexible shaft 6, and FIG. 13 shows a case where one or more holes of various sizes are provided instead of the slits. The size of the holes may be uniform or a plurality of sizes may be mixed. FIG. 12 shows a shape in which a part of the shaft is notched in the length direction over the entire length or a part of the flexible shaft. The number of the flexible shafts 6 is not necessarily one. For example, as shown in FIG. 9, a plurality of flexible shafts 6 can be provided. In the case where a plurality of flexible shafts 6 are provided, the plurality of shafts can be collected at arbitrary positions as shown in FIG. 9 or FIG. In that case, it is necessary to consider the position of the hemostasis valve on the main pipe 11 side of the connecting portion and to design so that blood does not leak from there. The safety of the flexible shaft 6 is higher when the position of the shaft can be grasped by X-ray contrast. In particular, when a resin material is used for the flexible shaft 6, it is preferable to mix contrast materials such as tungsten, bismuth carbonate, bismuth oxide, and barium sulfate in consideration of contrast.

It is the vascular catheter apparatus of this invention. 2 is a catheter element of the vascular catheter device of FIG. It is AA sectional drawing of FIG. Fig. 4 is a cross section of a tubular element protruding from a catheter shaft, with a guide wire passage in the tube wall, through which the guide wire passes. FIG. 2 is a cross-sectional view taken along the line BB of FIG. 1 with a tubular element inserted into the catheter shaft. The tubular element portion is the same as in FIG. 3, and a guide wire passage is provided in the tube wall. It is CC sectional drawing of FIG. 1, it becomes only the channel of a catheter shaft, there is no guide wire channel | path, and the guide wire 2 is located in internal space. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised by one flexible shaft. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised by one flexible shaft. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised by one flexible shaft. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention by which the distal end of the flexible shaft was comprised by three. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised from the proximal end of a flexible shaft by three. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised by one flexible shaft. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised by one flexible shaft. It is a longitudinal cross-sectional view of the vascular catheter apparatus of this invention comprised by one flexible shaft.

DESCRIPTION OF SYMBOLS 1 ... Catheter apparatus, 2 ... Guide wire, 3 ... Tubular element, 4 ... Tubular member of catheter shaft, 5 ... Connection part, 6 ... Flexible shaft, 7 ... -Hub, 8 ... suction device, 9 ... suction end, 10 ... guide wire passage, 11 ... main tube, 12 ... branch tube, 13 ... catheter element

Claims (12)

The catheter is inserted into a blood vessel, a thrombus in a blood vessel was removed by suction, or in a catheter system for injecting a drug solution into the blood vessel,
A catheter element comprising a tubular element having a proximal end and a distal end;
A catheter shaft including a tubular member that receives the tubular element of the catheter element;
A distal end of the tubular element of the catheter element projects from a distal end of the tubular member of the catheter shaft to form a thrombus suction port;
The clearance between the outer surface of the tubular element and the inner surface of the catheter shaft passes through a gap between the outer surface of the tubular element and the inner surface of the catheter shaft, or blood does not flow out of the catheter shaft, or a drug solution Is small enough so that does not flow into the catheter shaft, and the clearance between the outer surface of the tubular element and the inner surface of the catheter shaft does not impede movement of the tubular element within the catheter shaft Big enough,
The catheter element includes a flexible shaft having a proximal end and a distal end, the distal end of the flexible shaft being connected to the proximal end of the tubular element, A shaft extends proximally from the tubular element, the flexible shaft having an outer diameter that is smaller than an interior space of the tubular member of the catheter shaft, the flexible shaft being the catheter shaft is used to adjust the position of the tubular element of the catheter element with the inner, proximal end of the tubular element is positioned within the tubular member of the catheter shaft, and wherein the inner space of the tubular element catheter the internal space of the tubular member of the shaft are communicated,
Wherein the proximal end of the tubular member of the catheter shaft, thrombus is aspirated, or drug solution is injected, the catheter system. The catheter system of claim 1 having a connecting portion between the suction device or infusion device to the proximal end of the tubular member of the catheter shaft. The catheter system according to claim 2, wherein the connecting portion is a Y connector, and a suction device or an infusion device is connected to either the branch pipe or the main pipe of the Y connector. The catheter system according to any one of claims 1 to 3, wherein the catheter system is movable in a blood vessel while sucking a thrombus or injecting a drug solution. The catheter system according to any one of claims 1 to 4, comprising a guide wire and a guide wire passage for guiding the guide wire . The catheter system according to claim 5 , wherein the guide wire passage is provided in a tube wall of the tubular element . 7. A catheter system according to claim 5 or 6 , wherein the guidewire can extend beyond the distal end of the tubular element . The catheter system according to any one of claims 1 to 7, wherein a marker is provided at a distal end of the tubular element. The catheter system according to any one of claims 1 to 8 , wherein at least an outer surface of each of the tubular element and the tubular member of the catheter shaft is lubricated. The catheter system according to claim 1, wherein the flexible shaft has a solid cylindrical shape . The catheter system according to claim 1, wherein the flexible shaft has a hollow cylindrical shape . A plurality of flexible shafts individually connected to a proximal end of the tubular element, wherein the plurality of flexible shafts are single in a position proximal to the proximal end of the tubular element; The catheter system of claim 1, wherein the catheter system is grouped to form a flexible shaft .

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