Medical Devices and Medical Device Systems

Abstract

To provide a medical device capable of securing a sufficient inner diameter from the tip to the base end even when a tube body is made large in its diameter, and to provide a medical device system and a connection method of the medical device.SOLUTION: A medical device 10 includes a long-sized tube body 20 having a lumen 21 communicated from the tip to the base end, a connection part 30 provided at the base end part of the tube body 20, which has a base end lumen part 34 communicated with the lumen 21 of the tube body 20, and a valve body 35 provided in the base end lumen part 34. The base end lumen part 34 has an inner diameter equal to or larger than the minimum diameter of the lumen 21, and the base end part of the tube body 20 includes a contact part 25 with which the tip part of a suction device inserted from the valve body 35 comes in contact.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a medical device and a medical device system that includes an elongated tubular body having a lumen. [Background technology]

[0002] Medical devices having a long tubular body with a lumen are widely used. One example of such a medical device is a suction catheter. The suction catheter has a suction lumen as the lumen of the tubular body. A connector or other such connector to which a syringe can be connected is provided at the proximal end of the tubular body. When the tubular body is inserted into a living body, the syringe draws in suction through the suction lumen, allowing the suction catheter to aspirate thrombus present near the distal end of the tubular body. For example, Patent Document 1 discloses such a medical device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2004-535885 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to efficiently aspirate blood clots in blood vessels, it is effective to increase the diameter of the tubing. However, even if the inner diameter of the tubing is increased, if the inner diameter of the connection part for connecting the syringe is small, blood clots will clog the connection part, making it impossible to perform sufficient aspirating. Furthermore, when connecting a pump, a suction console, or the like to the tubing in addition to a syringe, there is also a possibility that blood clots will clog the connection part.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a medical device and a medical device system that can ensure a sufficient inner diameter from the tip to the base end even when the diameter of the tubular body is increased. [Means for solving the problem]

[0006] The medical device according to the present invention, which achieves the above object, comprises a long tubular body having a lumen communicating from its distal end to its proximal end, a connecting part provided at the proximal end of the tubular body and having a proximal end lumen portion communicating with the lumen of the tubular body, and a valve body provided in the proximal end lumen portion, wherein the proximal end lumen portion has an inner diameter equal to or greater than the minimum diameter of the lumen, and the proximal end of the tubular body is connected to a suction device inserted from the valve body. Body The tip of possible With contact part The contact portion has a tapered portion whose inner diameter increases from the distal end side toward the proximal end side, and the proximal end of the tapered portion is connected to the connecting portion, and the tapered portion is configured so that the distal end of the suction device tube is placed against its inner surface. .

[0007] The method for connecting a medical device according to the present invention, which achieves the above-mentioned object, comprises preparing a long tubular body having an inner lumen that communicates from the tip to the base end, selecting a connecting part having an inner diameter equal to or greater than the smallest diameter of the lumen from among connecting parts having a base end lumen, and connecting the selected connecting part to the base end side of the tubular body. [Effects of the Invention]

[0008] In the medical device configured as described above, the base end lumen of the connection part connected to the tubular body has an inner diameter equal to or greater than the smallest diameter of the lumen of the tubular body. Therefore, even if the diameter of the tubular body is increased, the inner diameter of the entire medical device is sufficiently secured, and objects passing through the lumen can pass unhindered to the base end of the medical device. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view showing the overall configuration of a medical device according to an embodiment. [Figure 2] FIG. 10 is an enlarged cross-sectional view of the vicinity of a connection portion of a medical device. [Figure 3] FIG. 10 is an enlarged cross-sectional view of the medical device with a syringe inserted through the connection portion. [Figure 4] FIG. 10 is an enlarged cross-sectional view of the vicinity of a tapered portion when a step is provided in the tapered portion. [Figure 5] FIG. 10 is an enlarged cross-sectional view of the medical device when the tubular body is fixed to the inner circumferential surface of the connecting portion. [Figure 6]FIG. 10 is an enlarged cross-sectional view of a medical device in which a tapered portion is not provided in the tubular body. [Figure 7] FIG. 10 is an enlarged cross-sectional view of a medical device in which a groove is provided in a tapered portion. [Figure 8] FIG. 1 is a front view of a medical device system in which a medical device is combined with a second device. [Figure 9] FIG. 1 is an enlarged cross-sectional view of the vicinity of a connection portion of a medical device system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the dimensional proportions in the drawings may be exaggerated for convenience of explanation and may differ from the actual proportions. In addition, in this specification, the side of the medical device 10 that is inserted into a body cavity will be referred to as the "distal end" or "distal side," and the side that is operated by the operator will be referred to as the "proximal end" or "proximal side."

[0011] The medical device 10 of this embodiment is configured as a suction catheter that is inserted into a biological lumen and aspirates matter such as a thrombus present in the biological lumen using a syringe 15. Note that the device that performs the suction is not limited to the syringe 15, and may be a suction bottle, a pump, or the like.

[0012] 1, the medical device 10 has a long tubular body 20 and a connecting part 30 provided at the proximal end of the tubular body 20. A syringe tubular body 40 of a syringe 15 is inserted into the connecting part 30.

[0013] As shown in Figure 2, the tubular body 20 has a lumen 21 along its length. Objects within a biological lumen can be aspirated via the lumen 21. The tubular body 20 has a tapered section 22 at its proximal end, the inner diameter of which increases from the distal end to the proximal end. The proximal end of the tubular body 20 having the tapered section 22 forms an abutment section 25 with which the syringe 15, which is a suction device, abuts.

[0014] The tubular body 20 is preferably made of a material having a certain degree of flexibility, such as polyolefins such as polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer, or a mixture of two or more of these, soft polyvinyl chloride resin, polyamide, polyamide elastomer, polyester, polyester elastomer, polyurethane, fluororesins such as polytetrafluoroethylene, polyimide, PEEK, silicone rubber, and latex rubber.

[0015] The connection part 30 to which the base end of the tubular body 20 is connected has a hollow main body part 31 and a pressing part 32 provided at the base end of the main body part 31. The main body part 31 has a cylindrical tip part 33. The base end part 22a of the tubular body 20 is fixed to the connection part 30 so as to cover the outer peripheral surface of the tip part 33 of the main body part 31. The pressing part 32 is threadedly engaged with the main body part 31 and can move forward and backward by rotating relative to the main body part 31. The pressing part 32 has an opening part 32a so that the tubular body can be inserted into the connection part 30.

[0016] The connecting part 30 has a proximal end lumen 34 that communicates with the lumen 21 of the tubular body 20. The proximal end lumen 34 extends from the tip to the proximal end of the connecting part 30. A valve body 35 is disposed in the proximal end lumen 34. The valve body 35 has a slit in the center through which a tubular body can be inserted, and when the valve body 35 is inserted, it is pressed toward the tip by the pressing part 32, thereby improving the sealing performance.

[0017] The valve body 35 is made of an elastic material, such as various rubbers, including silicone rubber, fluororubber, isoprene, and natural rubber, various resins, including polyurethane, polyamide elastomer, polybutadiene, and soft vinyl chloride, or a combination of two or more of these.

[0018] The proximal lumen 34 has an inner diameter greater than the minimum diameter of the lumen 21 of the tubular body 20 over the entire length from the tip to the proximal end. The proximal lumen 34 only needs to have an inner diameter equal to or greater than the minimum diameter of the lumen 21 of the tubular body 20.

[0019] As shown in FIG. 3 , a syringe tube 40 can be inserted into the proximal lumen 34 from the proximal end side. A syringe tube 40 with a large diameter can be used depending on the inner diameter of the proximal lumen 34. The syringe tube 40 passes through the valve body 35 and is disposed in the proximal lumen 34, with its tip abutting the inner surface of the tapered portion 22. In this state, the lumen 21 can be aspirated using the syringe 15. As such, the tube 20 has the tapered portion 22 whose inner diameter increases toward the proximal end, and the tip of the syringe tube 40 abuts against the tapered portion 22, reducing the step from the lumen 21 to the syringe 15 and enabling efficient aspiration.

[0020] In this embodiment, the outer diameter of the tubular body 20 excluding the tapered portion 22 is 5.3 mm, and the inner diameter is 4.3 to 4.7 mm. Therefore, the inner diameter of the proximal lumen portion 34 is set to be at least greater than 4.3 to 4.7 mm. However, the dimensions of the tubular body 20 are not limited to these and can be set arbitrarily.

[0021] 4, a step 23 may be formed along the circumferential direction on the inner surface of tapered portion 22. Step 23 is formed so that the tip of syringe tube 40 can abut against it. This allows syringe tube 40 to stably abut against tube 20, enabling more efficient suction.

[0022] 5, the base end 22a of the tapered portion 22 may be fixed by abutting against the inner circumferential surface of the tip portion 33 of the connecting portion 30. In this case, the tip of the syringe tube 40 can also abut against the tapered portion 22.

[0023] 6, the tubular body 20 may not have a tapered portion. In this case, an expanded diameter portion 41 whose inner diameter increases from the base end toward the tip end is provided at the tip of the syringe tubular body 40, and the expanded diameter portion 41 is positioned in the lumen 21 of the tubular body 20, thereby making it possible to connect the lumen 21 and the syringe tubular body 40 without any steps.

[0024] As shown in FIG. 7 , a groove 24 may be provided on the inner surface of tapered portion 22 along the longitudinal direction. One or more grooves 24 may be provided circumferentially. A guidewire 18 that passes through lumen 21 and proximal lumen 34 in the longitudinal direction can be accommodated in groove 24. As a result, even if the tip of syringe tubular body 40 abuts on tapered portion 22 when guidewire 18 is inserted into lumen 21, no gap is generated between the inner surface of tapered portion 22 and syringe tubular body 40 because guidewire 18 is accommodated in groove 24, and this prevents a decrease in suction efficiency.

[0025] As shown in Fig. 8, the medical device 10 may be used as a medical device system by inserting a second device 11 therein. The second device 11 has a small-diameter shaft portion 50 that is longer than the tubular body 20, and a hub 51 is provided at the proximal end of the small-diameter shaft portion 50. A syringe or the like can be connected to the hub 51. As shown in Fig. 9, the small-diameter shaft portion 50 inserted into the medical device 10 passes through the valve body 35 and extends along the proximal lumen portion 34 and the lumen 21.

[0026] After suctioning a thrombus or the like with the medical device 10, a contrast agent is injected to confirm whether or not a thrombus is present in the biological lumen. A thrombolytic agent may also be injected before suction by the medical device 10 begins. When attempting to inject a liquid into a living body from the distal end of the tubular body 20, the proximal lumen 34 and the lumen 21 have large volumes. Therefore, if the fluid is injected directly from the connecting portion 30 of the medical device 10, a large amount of fluid will remain in the proximal lumen 34 and the lumen 21. Injecting the fluid using the second device 11 allows the fluid to flow from the distal end to the proximal end of the medical device 10, reducing waste of the injected fluid.

[0027] In FIGS. 8 and 9, the second device 11 is a dilator, but the second device 11 may be any device having a tubular body that can be inserted into the lumen 21 and the proximal lumen portion 34, such as a small-diameter catheter.

[0028] When using a medical device, a connecting part may be selected to match the inner diameter of the tubular body to be inserted. First, a long tubular body having a lumen communicating from the distal end to the proximal end is prepared. Next, from among the connecting parts having a proximal lumen, a connecting part having an inner diameter equal to or greater than the smallest diameter of the lumen of the tubular body over the entire length from the distal end to the proximal end is selected. Next, the selected connecting part is connected to the proximal end side of the tubular body. After the connecting part is connected to the tubular body, the tubular body is inserted into the living body and treatment is performed. Any type of connecting part can be selected as needed.

[0029] As described above, the medical device 10 according to this embodiment includes a long tubular body 20 having a lumen 21 that communicates from the distal end to the proximal end, a connecting portion 30 that is provided at the proximal end of the tubular body 20 and has a proximal lumen 34 that communicates with the lumen 21 of the tubular body 20, and a valve body 35 that is provided in the proximal lumen 34, the proximal lumen 34 having an inner diameter equal to or greater than the minimum diameter of the lumen 21, and the proximal end of the tubular body 20 has an abutment portion 25 that abuts against the distal end of a suction device inserted through the valve body 35. The connecting method for the medical device according to this embodiment includes preparing a long tubular body 20 having a lumen 21 that communicates from the distal end to the proximal end, selecting a connecting portion 30 from the connecting portions 30 that have the proximal lumen 34 and that has an inner diameter equal to or greater than the minimum diameter of the lumen 21 of the tubular body 20 over the entire length from the distal end to the proximal end, and connecting the selected connecting portion 30 to the proximal end of the tubular body 20. In the medical device 10 and the connection method for the medical device 10 configured in this manner, the base end lumen 34 of the connection part 30 connected to the tubular body 20 has an inner diameter equal to or greater than the minimum diameter of the lumen 21 of the tubular body 20. Therefore, even if the diameter of the tubular body 20 is increased, the inner diameter of the entire medical device 10 is sufficiently secured, and objects passing through the lumen 21 can pass through to the base end of the medical device 10 without hindrance.

[0030] The contact portion 25 may have a tapered portion 22 whose inner diameter increases from the distal end to the proximal end, and the proximal end 22a of the tapered portion 22 may be coupled to the connecting portion 30. This allows a tubular body such as a syringe inserted into the proximal lumen to abut against the tapered portion 22, reducing the step from the lumen 21 to the syringe 15 and enabling efficient suction. In the tapered portion 22, both the inner and outer diameters of the tubular body 20 may increase from the distal end to the proximal end, or the outer diameter of the tubular body 20 may be constant along the length and only the inner diameter may increase from the distal end to the proximal end.

[0031] The tapered portion 22 may have a step 23 on the inner surface along the circumferential direction, which allows the tubular body inserted into the proximal lumen to stably abut against the tapered portion, enabling more efficient suction.

[0032] Tapered portion 22 may have a groove 24 on its inner surface along the length direction. With this, even if the tip of syringe tube 40 abuts against tapered portion 22 when guidewire 18 is inserted into lumen 21, guidewire 18 is housed in groove 24, so no gap is generated between the inner surface of tapered portion 22 and syringe tube 40, and the efficiency of suction is not reduced.

[0033] The medical device may further include a second device 11 having a small-diameter shaft portion 50 that is inserted throughout the entire length of the lumen 21 of the tubular body 20 and the proximal lumen 34 of the connecting portion 30. When injecting a fluid into a living body, use of the second device 11 can prevent the fluid from remaining in the large-volume proximal lumen 34, thereby reducing waste of the injected fluid.

[0034] The present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art within the technical spirit of the present invention. In the above-described embodiment, the suction device abuts on the inner surface of the lumen 21 at the abutment portion 25, but it may also abut on the proximal end surface of the tubular body 20. [Explanation of symbols]

[0035] 10 Medical Devices 11 Secondary Device 15 syringes 18 Guidewire 20 Body 21 lumen 22 Tapered section 22a Proximal end 23 Step section 24 Groove 25 Contact part 30 Connection 31 Main body 32 Pressing section 32a opening 33 Tip 34 Proximal lumen 35 Valve body 40 Syringe tube body 41 Expanded diameter part 50 Small diameter shaft section 51 Hub

Claims

1. a long tubular body having a lumen communicating from the distal end to the proximal end; a connecting portion provided at a proximal end of the tubular body and having a proximal end lumen portion communicating with the lumen of the tubular body; a valve body provided in the proximal end lumen portion, the proximal lumen portion has an inner diameter equal to or greater than the minimum diameter of the lumen, a proximal end of the tubular body having an abutment portion against which a distal end of the suction device tubular body inserted from the valve body can abut; The contact portion has a tapered portion whose inner diameter increases from the distal end side to the proximal end side, a base end of the tapered portion is coupled to the connecting portion, The medical device is configured such that the tip of the suction device tube is placed against the inner surface of the tapered portion.

2. The medical device according to claim 1 , wherein the tapered portion has a step on the inner surface along the circumferential direction.

3. The medical device of claim 1 , wherein the tapered portion has a groove on the inner surface along the length thereof.

4. A first device which is the medical device according to any one of claims 1 to 3; a second device having a small diameter shaft portion that is inserted through the lumen of the tubular body and the entire length of the proximal lumen of the connecting portion.

Images