JP5966709B2 - Trocar catheter, outer catheter used therefor, and inner needle - Google Patents

Description

  The present invention relates to a trocar catheter, a mantle catheter used therefor, and an inner needle.

  In the medical field, drainage means drainage, which discharges blood, pus, exudate, fire-extinguishing fluid, air, etc. out of the patient's body. A medical tube to be inserted for drainage is called a drain catheter, and various drain catheters are used by medical departments. In particular, a drain catheter in which an inner needle and an outer catheter are combined is commonly called a trocar catheter, and an outer catheter having a side hole at the distal end and an inner needle in combination are generally used. This trocar catheter is used to puncture the body, then remove the inner needle, leave only the outer catheter in the body, and continuously drain fluid and the like.

JP 2002-272755 A Japanese Examined Patent Publication No. 2-17185 JP 2009-247766 A

  However, in the conventional trocar catheter, since suction is performed by the side hole and the tip hole, an organ or the like, which is a soft tissue, is sucked and this may adhere to the side hole or the like. As a result, there is a problem that the liquid cannot be drained or exhausted, and the catheter must be removed and reinserted. As a result, there is a risk of invasion to the patient and a burden on the operator. (For example, see Patent Document 1)

  Further, in order to eliminate the drainage trouble due to the close contact in the wound catheter for the wound part, the proximal end part is formed in a cylindrical shape, and the liquid collection part placed in the patient's wound part is divided across the central axis. Further, those formed in a plurality of flow paths have been proposed. A slit is formed in the liquid collecting part of the drain catheter for the wound part by notching the outer peripheral part of the wall part forming each flow path. When such a slit is provided, the opening of the wound drainage catheter becomes larger, so that the drainage can be efficiently sucked (for example, see Patent Documents 2 and 3).

  However, the shape of the above-mentioned wound drain catheter cannot be combined with a simple inner needle that has been conventionally used for a trocar catheter, and thus cannot be used as a trocar catheter. The present invention has been made in view of the above problems, and an object thereof is to provide a trocar catheter excellent in drainage / exhaust performance, an outer catheter used therein, and an inner needle.

  The trocar catheter according to the present invention includes a mantle catheter and an inner needle inserted into the mantle catheter, and the mantle catheter is connected to a cylindrical drainage portion and a distal end side of the drainage portion. A liquid collecting portion, and the liquid collecting portion has a plurality of flow paths partitioned by partition walls in cross section, and the plurality of flow paths include at least one main flow path and at least one sub-flow path. The main flow path and the sub flow path are both in communication with the internal space of the drainage part, and the axial end of each main flow path is formed at the tip of the liquid collection part. Opening to the outside through the tip opening, the axial end of each sub-flow channel terminates inside the liquid collection unit, and at least one of the sub-flow channels is connected to the liquid collection unit Open to the outside in the radial direction through the peripheral surface opening formed on the outer peripheral surface The inner needle is inserted into each main flow path, and is accommodated so as to protrude from the front end opening of the liquid collection part, and at least one main needle inserted into each sub flow path. A sub-inner needle, and the main inner needle and the sub-inner needle are held in a state in which at least the tip side is bundled so as to be separated from each other.

  According to this configuration, a plurality of flow paths are formed in the liquid collecting portion of the outer catheter, and the inner needle is provided with the main inner needle and the sub inner needle that are inserted into the respective flow paths. Therefore, a trocar catheter combining a conventional wound catheter drain catheter and an inner needle can be provided. In particular, since the main inner needle and the sub inner needle are held in a state where at least the distal ends thereof are bundled so as to be separable from each other, they can be individually inserted into a plurality of channels of the outer catheter. Moreover, the intensity | strength of the whole inner needle can be improved by comprising an inner needle with a some needle as mentioned above. Therefore, the strength of the outer catheter into which the inner needle is inserted can be improved, and when the outer catheter is inserted into the body, it is possible to prevent a situation where insertion becomes difficult due to bending or the like.

  Although the said surrounding surface opening can be made into various shapes, for example, it can be formed in the slit shape extended along the axial direction of a liquid collection part. Thereby, a suction area can be expanded.

  In any one of the above trocar catheters, the distal end of the sub-flow channel can be disposed on the distal end side with respect to the circumferential surface opening. If comprised in this way, if the sub inner needle will be inserted to the front-end | tip of a sub flow path, the front-end | tip of a sub inner needle will not be exposed from a surrounding surface opening. Therefore, it is possible to prevent the auxiliary inner needle from protruding from the circumferential surface opening to the outside during the storage of the catheter.

  In any one of the above trocar catheters, the number of main flow paths, sub flow paths, main inner needles, and sub inner needles is not particularly limited. For example, one main flow path and one main inner needle are provided, and one sub flow path is provided. In addition, 2 to 4 sub-inner needles can be provided, and each sub-channel can be opened to the outside through the peripheral surface opening.

  In any one of the above trocar catheters, the inner wall surface of the drainage portion of the outer catheter can be formed to correspond to the outer shape of the inner needle in cross section. Accordingly, when the inner needle is inserted into the outer catheter, the inner needle can be prevented from rotating in the direction around the axis with respect to the outer catheter. Therefore, when the inner needle is inserted, the main inner needle and the sub inner needle can be reliably inserted into the corresponding flow paths.

  In any of the above trocar catheters, a linear mark extending in the axial direction along the main channel or the sub-channel can be provided on the outer peripheral surface or the inner peripheral surface of the outer catheter. Thus, when the inner needle is inserted into the outer catheter, the main inner needle or the auxiliary inner needle can be accurately inserted into the corresponding flow path of the outer catheter with reference to the mark.

  In addition, in any one of the above trocar catheters, a connecting mechanism for detachably connecting the proximal end portion of the outer catheter and the proximal end portion of the inner needle can be further provided. Thereby, since the inner needle and the outer catheter are detachably integrated, it is possible to prevent the inner needle from shifting in the longitudinal direction with respect to the outer catheter.

  An outer catheter according to the present invention is an outer catheter into which an inner needle having at least one main inner needle and at least one auxiliary inner needle and having at least a distal end side thereof bundled together so as to be separable from each other is inserted. A cylindrical drainage section and a cylindrical liquid collection section connected to a distal end side of the drainage section, wherein the liquid collection section is divided into a plurality of streams partitioned by a partition wall in cross section. The plurality of flow paths are composed of at least one main flow path and at least one sub flow path, and both the main flow path and the sub flow path communicate with the internal space of the drainage part, The axial end of each main channel opens to the outside through a tip opening formed at the tip of the liquid collection unit, and the axial end of each sub-flow channel is the liquid collection unit And at least one of the sub-flow paths It opens to the outside in the radial direction through a peripheral surface opening formed on the outer peripheral surface of the liquid collection part, and each main inner needle is inserted into each main flow path and protrudes from the front end opening of the liquid collection part And the sub inner needles are inserted into the sub flow paths.

  An inner needle according to the present invention includes a cylindrical drainage part and a cylindrical liquid collection part connected to a distal end side of the drainage part, and the liquid collection part is partitioned by a partition wall in a cross section. A plurality of flow paths, the plurality of flow paths including at least one main flow path and at least one second flow path, and the main flow path and the sub flow path are both internal spaces of the drainage section. The axial end of each main flow channel opens to the outside through a tip opening formed at the tip of the liquid collection portion, and the axial end of each sub flow channel is In addition to terminating in the liquid collection part, at least one of the sub-flow paths is configured to open to the outside in the radial direction through a peripheral surface opening formed on the outer peripheral surface of the liquid collection part. An inner needle to be inserted into the outer sheath catheter, which is inserted into each of the main flow paths, and the distal end opening of the liquid collection part At least one main inner needle accommodated so as to protrude from the at least one sub-passage and at least one sub-inner needle inserted into each of the sub-channels. It is held in a state of being bundled so as to be separable.

  According to the present invention, drainage / exhaust performance can be improved.

It is a perspective view which shows one Embodiment of the trocar catheter of this invention. It is the schematic which shows the whole figure of an example of a mantle catheter used for this invention. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is the CD sectional view taken on the line in FIG. It is the schematic which shows the whole figure of an example of the inner needle used for this invention. It is the DD sectional view taken on the line in FIG. FIG. 3 is a cross-sectional view showing the positional relationship between an outer catheter and an inner needle corresponding to FIG. 2. FIG. 5 is a cross-sectional view showing a positional relationship between an outer catheter and an inner needle corresponding to FIG. 4. It is sectional drawing which shows the other example which concerns on the trocar catheter of this invention.

  Hereinafter, an embodiment of a trocar catheter according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a trocar catheter according to the present embodiment, FIG. 2 is a side view of an outer catheter constituting a part of the trocar catheter, FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a cross-sectional view taken along the line BB in FIG. In the following description, the left side in FIG. 2 is referred to as the front end side or the front side, and the right side is referred to as the base end side or the rear side, and other drawings will also be described based on this. A line passing through the center of the cross section of the outer sheath catheter is defined as an axis X.

  As shown in FIG. 1, the trocar catheter 1 includes an outer catheter 2 formed in a cylindrical shape, and an inner needle 13 accommodated in the outer catheter 2. First, the outer catheter 2 will be described. As shown in FIG. 2 to FIG. 5, the mantle catheter 2 is composed of a molded body extending in a long shape with an outer peripheral portion formed in a substantially circumferential shape. Specifically, as shown in FIG. 2, the hub 3, the drainage portion 4, the transition portion 5, the slit portion 6, and the tip portion 7 are connected from the base end side toward the tip end side. These members are joined by adhesion, heat fusion, or the like. Further, the tip portion 7 and the slit portion 6 may be collectively referred to as a liquid collection portion 8. Hereinafter, each part will be described.

  The hub 3 is provided at the tail end of the outer catheter 2 and is formed in a cylindrical shape by a hard resin material. And the base end part side of the hub 3 is connected with the base end part of the inner needle 13 mentioned later so that attachment or detachment is possible. Specifically, a pair of protrusions 3 a are formed on the peripheral edge of the rear end portion of the hub 3 so as to protrude radially outward with the axis X therebetween. And this protrusion 3a is screwed into the internal thread formed in the base end part of the inner needle 13 so that it may mention later.

  A cylindrical drainage portion 4 is attached to the distal end side of the hub 3. The drainage part 4 is formed of a transparent flexible resin material, and occupies most of the length of the outer catheter 2. As shown in FIG. 3, the cross-sectional shape of the internal space 10 of the drainage part 4 is circular. And the liquid collection part 8 is connected to the edge part of the front end side of this drainage part 4 via the transfer part 5. FIG. The liquid collection part 8 includes a slit part 6 and a front end part 7 connected to the front end thereof, and is formed of a flexible resin material colored transparent or white. The slit portion 6 is formed in a cylindrical shape, and as shown in FIG. 4, two slits 13a and 13b communicating with the inside are formed on the outer peripheral surface 11a. Each slit 13a, 13b extends in the axial direction and is formed at a predetermined interval in the circumferential direction. Although the number of slits is not particularly limited, the number of flow paths branching increases as the number of slits increases, and as a result, the flow path becomes narrower when the diameter is the same. Therefore, as will be described later, the main inner needle and the sub inner needle to be combined become thinner, the strength of the inner needle is lowered, and it is difficult to insert into the body. Therefore, the number of slits is preferably 2 to 6, more preferably 2 to 4, and particularly preferably 2.

  In addition, the transition part 5 is arrange | positioned between the drainage part 4 and the slit part 6, and connects both, The drainage part 4 and the slit part 6 are members, such as the same kind or different resin material. It is configured. For example, it can be configured to have at least one of a lumen corresponding to the internal space 10 of the drainage portion 4 and a lumen corresponding to each of the flow paths 12 a to 12 c of the slit portion 6. However, when the drainage part 4 and the slit part 6 can be directly connected, the transition part 5 is not particularly necessary. The length of the transition portion according to this embodiment is preferably 0 mm to 20 mm, preferably 0 mm to 10 mm, and more preferably 0 mm to 5 mm (0 mm means a case where no transition portion is provided).

  As shown in FIG. 4, the slit portion 6 has an outer peripheral surface 11a having substantially the same outer diameter as the drainage portion 4, and the inside thereof has three partition walls 11b, 11c, 11d as shown in FIG. And has three flow paths that extend in the axial direction. More specifically, the three partition walls, that is, the first, second, and third partition walls 11b, 11c, and 11d extend radially outward from the axis X of the slit portion 6 and are connected to the inner wall surface of the slit portion 6. ing. The partition walls 11b, 11c, and 11d are connected at an angle of about 120 degrees, thereby forming three substantially fan-shaped cross-section flow paths inside the slit portion 6. . Hereinafter, these are referred to as first, second and third flow paths 12a, 12b and 12c. Further, these three flow paths 12 a, 12 b, 12 c communicate with the internal space 10 of the drainage part 4. Of the three channels 12a, 12b, and 12c, the slits 13a and 13b described above are formed on the outer peripheral surface 11a of the slit portion 6 corresponding to the first and second channels 12a and 12b.

  A cylindrical tip 7 having a taper is integrally formed on the tip of the slit 6. The slits 13a and 13b formed in the slit portion 6 terminate in the vicinity of the distal end side of the slit portion 6, but as shown in FIGS. It extends to the inside. Of the three flow paths, the first flow path 12a communicates with the distal end port 71 formed at the distal end of the distal end portion 7 and is opened to the outside. On the other hand, the 2nd and 3rd channel 12b and 12c are terminated inside tip part 7, and are not open outside. And the front-end | tip of the sub inner needle 15 of the inner needle 13 mentioned later latches to the front-end | tip of these 2nd and 3rd flow paths 12b and 12c. As shown in FIG. 2, the tips of the second and third flow paths 12b and 12c are in front of the tips of the slits 13a and 13b. Not exposed from. That is, the tips of the second and third flow paths 12b and 12c are formed in a pocket shape. And in the front-end | tip part 7, the taper is formed in the front side rather than the front-end | tip of the 2nd and 3rd flow paths 12b and 12c, and it is what is so thin that it goes to a front-end | tip. At the end portion of the tip portion 7 thus narrowed, a tip opening 71 through which the first flow path 12a described above is opened is formed. In order to improve the insertion into the body, a tip hard tip harder than the material of the drainage portion 4 or the slit portion 6 may be joined to the tip of the tip portion 7 (not shown).

  As shown in FIGS. 2 and 3, a linear mark 9 made of an impermeable material that does not allow X-rays to pass through from the drainage part 4 to the liquid collection part 8 of the outer catheter 2. Is provided. This mark 9 extends along the axial direction, and is used for recognizing the position of the first flow path 12a of the liquid collection part 4. In addition, when the outer catheter 2 is placed in the patient's body, X-rays are used. This is also used as a contrast marker when a predetermined confirmation operation is performed by irradiation. The mark 9 is provided in the range from the drainage part 4 to the tip part 7 or in the drainage part 4 so that the flow path of the liquid collection part 8 can be recognized. When the mark 9 is provided on the inner wall surface of the mantle catheter 2, it is necessary to form the portion with a transparent material so that the mark 9 can be visually recognized from the outside.

  The material of the drainage part 4, the transition part 5, and the liquid collection part 6 of the outer catheter 2 described above may be any material that is safe and elastic when placed in the body, particularly in a blood vessel. Examples of such materials include polyurethane, silicone, polyvinyl chloride, polybutadiene, polyamide, ethylene-vinyl acetate copolymer, etc., but have the property of maintaining hardness and flexibility in the body. It is preferable to use polyurethane.

  Further, the outer catheter 2 may be subjected to an antithrombotic treatment in order to prevent the formation of a thrombus upon contact with blood during placement. Antithrombotic treatment is a method in which a plasminogen activator such as urokinase is immobilized on the catheter surface of the base material by a chemical bonding method (for details, refer to Japanese Patent No. 1406830), and an anticoagulation factor such as heparin is immobilized on the catheter surface. Various methods have been developed, such as a method for realizing the above, but the method is not limited to a specific method. Further, the antithrombotic treatment range may be the inner surface, the outer surface, or both of the outer catheter 2 as long as it is a portion that comes into contact with the living body.

  Further, the outer catheter 2 is subjected to a lubrication treatment such as coating the surface of a base material with a hydrophilic polymer compound in order to facilitate insertion into a subcutaneous tissue or a blood vessel (for example, Japanese Patent Laid-Open No. Hei 10). -2491919). Many methods have been developed for the lubricity treatment, and any method may be selected. The range of the lubrication treatment may be any part as long as it is a part that comes into contact with the human body or a part that comes into contact with a tool or the like for placing the catheter.

  The outer catheter can have various lengths, for example, a total length of about 50 to 500 mm, preferably 100 to 300 mm, and an outer diameter of about 1 to 10 mm, more preferably 2 to 6 mm, still more preferably 2 to 4 mm. Can be set to Further, the inner diameter is 90% to 30% of the outer diameter, preferably 70% to 50%, except for the liquid collecting part 8 which is about 20 to 300 mm, preferably 25 to 200 mm, more preferably 30 to 100 mm. It consists of a set single tubular drainage section 4. And as shown in FIG. 3, the drainage part side lumen | bore 10 with a circular cross-sectional shape is formed in the inside.

  Next, the inner needle 13 will be described with reference to FIGS. 6 is a perspective view of the inner needle, FIG. 7 is a side view of FIG. 6, and FIG. 8 is a cross-sectional view taken along the line DD of FIG. As shown in FIGS. 6 to 8, the inner needle 13 includes a main inner needle 14 made of stainless steel or the like and a pair of auxiliary inner needles 15. A cylindrical needle base 16 is attached to the base end portions of the main inner needle 14 and the sub inner needle 15, and the main inner needle 14 and the sub inner needle 15 are integrally held by the needle base 16. Yes. Specifically, as shown in FIG. 8, the main inner needle 14 and the pair of sub inner needles 15 are bundled so that the outer peripheral surfaces are in close contact with each other, and extend in the axial direction. At this time, the pair of sub inner needles 15 are arranged so as to contact each other, and further, both the sub inner needles 15 are arranged so as to contact the main inner needle 14. In addition, a flow path extending in the axial direction is formed inside the main inner needle 14, but the sub inner needle 15 is solid without any internal space.

  The outer diameter of the needle base 16 is formed larger than that of the main inner needle 14 and the sub inner needle 15, and a cylindrical lock ring 17 is attached to the distal end side of the needle base 16 so as to be rotatable around the axis. It has been. The lock ring 17 is disposed so as to cover the outer peripheral surface of the needle base 16 and further cover the main inner needle 14 and the sub inner needle 15. An internal thread is formed on the inner wall surface of the lock ring 17, and the protrusion 3 a of the hub 3 of the outer catheter 2 described above is screwed into the internal thread of the lock ring 17. The lock ring 17 is used for detachably fixing the inner needle 13 and the outer catheter 2 as described above, but the lock ring 17 may not be attached.

  In the inner needle 13, the main inner needle 14 is longer than the sub inner needle 15 and has a sharp shape with its tip cut off obliquely. That is, the main inner needle 14 extends from the sub inner needle 15 on the distal end side. For example, the main inner needle 14 is about 3 to 20 mm, preferably 5 to 15 mm, more preferably 8 to 12 mm. The inner needle 15 may be extended. However, this length is not particularly limited. As will be described later, the length is appropriately optimized depending on the positional relationship with the second and third flow paths 12b and 12c in which the tip of the auxiliary inner needle 15 is accommodated. Can be set.

  The tip of the auxiliary inner needle 15 is not sharp but has a flat shape or a rounded shape. Further, as shown in FIG. 7, at the distal end portions of the main inner needle 14 and the sub inner needle 15, the sub inner needles 15, and both the sub inner needles 15 and the main inner needle 14 are not fixed to each other. It is configured to be separated (non-fixed area). However, the main inner needle 14 and the sub inner needle 15 are fixed so as not to be separated from each other on the base end side from this portion (non-fixed region). For example, the main inner needle 14 and the sub inner needle 15 can be fixed on the base side from a position of about 60 mm from the tip of the main inner needle 14. The longer the fixing range, the higher the elastic modulus and the better the insertion property, so it is preferable that the fixing range is as long as possible. It is preferable that the drainage part 8 is formed to a position advanced from the distal end to the base end side by a predetermined length, that is, the length + α of the drainage part 8. For example, the range of α is preferably 10 to 100 mm, more preferably 10 to 50 mm, and particularly preferably 10 to 30 mm.

  The main inner needle 14 and the sub inner needle 15 may have a shape in which only a tip portion is branched by bonding, welding or the like, or by cutting or laser processing. Moreover, as a material which comprises the inner needle 13, plastics, such as a polypropylene and a polyvinyl chloride other than metals, such as stainless steel, can also be used.

  Next, the usage method of the trocar catheter comprised as mentioned above is demonstrated. First, the inner needle 13 is inserted into the outer catheter 2. At this time, the main inner needle 14 of the inner needle 13 is accommodated in the first flow path 12a so that the distal end of the main inner needle 14 protrudes from the distal end 71 of the outer catheter 2. Further, the auxiliary inner needle 15 is accommodated in the second and third flow paths 12b and 12c, respectively. At this time, the positional relationship between the outer catheter 2 and the inner needle 13 is as shown in FIGS. 8 corresponds to FIG. 3, and FIG. 9 corresponds to FIG. In this state, the lock ring 17 of the outer catheter 2 is rotated, and the protrusion 3 a of the hub 3 is screwed into the female screw of the lock ring 17. Thus, as shown in FIG. 1, the outer catheter 2 and the inner needle 13 are fixed to form a trocar catheter 1.

  Next, local anesthesia is performed on the insertion site, a small incision is made in the skin, and the trocar catheter 1 is inserted to a desired depth. Subsequently, the lock ring 17 is rotated to release the fixed state with the protrusion 3a. In this state, the inner needle 13 is removed, and a suction device (not shown) is connected to the hub 3. Then, by operating the suction device, drainage or gas generated in the chest cavity of the patient is removed. In this case, the drainage is sucked from the first flow path 12a and the slits 13a and 13b, passes through the outer catheter 2 and is sucked into the storage container of the suction device.

  Further, in the present embodiment, drainage and gas can also be sucked from the slits 13a and 13b to the portions corresponding to the distal end side channels 12a and 12b in the outer peripheral portion 11a of the outer catheter 2 respectively. This enables effective drainage and gas discharge by the outer catheter. The tip-side flow path 12c without a slit can be used as a hole through which the main needle of the inner needle passes, and the other flow paths 12a and 12b can be used as a route through the sub needle of the inner needle.

  As described above, according to the present embodiment, the plurality of flow paths 12a to 12c are formed in the liquid collection part 8 of the outer catheter 2, and the inner needle 13 is inserted into each of the flow paths 12a to 12c. A needle 14 and a sub-inner needle 15 are provided. Therefore, a trocar catheter combining a conventional wound catheter drain catheter and an inner needle can be provided. In particular, the main inner needle 14 and the sub inner needle 15 are held in a state in which at least the distal end sides are bundled so as to be separated from each other, and therefore, these are individually inserted into the plurality of flow paths 12 a to 12 c of the outer catheter 2. Can do. Further, by configuring the inner needle 13 with a plurality of needles as described above, it is possible to improve the strength of the entire inner needle 13 as compared to the case where the inner needle 13 is configured with only the main inner needle 14. Therefore, the strength of the outer catheter 2 into which the inner needle 13 is inserted can be improved, and when the outer catheter 2 is inserted into the body, it is possible to prevent a situation where the insertion becomes difficult due to bending or the like.

  In addition, since the outer catheter according to the present embodiment has three flow paths, for example, even if one flow path sucks soft tissue and is blocked, suction from the other flow paths is not possible. Since it is possible, it is possible to prevent the drainage failure and the exhaust failure. Moreover, since the external shape of the slit part 6 is supported by the partition walls 11b to 11d constituting the three flow paths, kinking when the catheter is bent can be prevented. Furthermore, since the flow paths into which the main inner needle 14 and the sub inner needle 15 are inserted are respectively determined, the inner needle 13 can be positioned with respect to the outer catheter 2, and the inner needle 13 can be positioned in the outer catheter 2. , Rotation around the axis X can be prevented.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible unless it deviates from the meaning. For example, the outer catheter 2 may be formed by molding the respective portions along the longitudinal direction and then joining them, or may be formed by integral molding.

  In the above embodiment, as shown in FIG. 3, the cross section of the internal space of the drainage part 4 is circular, but for example, as shown in FIG. It can form so that the outer diameter of this may be followed. In this example, three concave portions 41 corresponding to the main inner needle 14 and the pair of sub inner needles 15 of the inner needle 13 are formed on the inner wall surface of the inner space in a cross-sectional view so that these concave portions 41 extend in the axial direction. Is formed. If it does in this way, it will become easy to insert the main needle 14 in the 1st channel 12a intended. Furthermore, during the treatment, there is a case where the inner needle 13 is slightly shifted toward the hand side to confirm whether or not the target depth can be inserted. There is a case where the needle 13 is returned to the original position and pushed forward. In such a case, if the concave portion 41 as described above is provided, the main inner needle 14 of the inner needle 13 can be easily reinserted into the flow path 12a.

  In the above embodiment, the main inner needle 14 and the sub inner needle 15 are fixed except for the distal end side. However, the present invention is not limited to this. It can also be.

  Further, in the above embodiment, since the main inner needle 14 is formed in a pipe shape having a lumen, it is possible to confirm whether the drainage or the like is sucked from the distal end portion of the main inner needle 14 and reaches the target site. Yes, but not limited to this. That is, the main inner needle 14 can be formed of a rod-shaped material having no lumen. Further, the secondary inner needle 15 may be either a pipe shape having a lumen or a rod-shaped material having no lumen.

  Further, the number of flow paths, the number of main inner needles, and the number of sub inner needles are not particularly limited, and the fixing positions of the main inner needle and the sub inner needle are not particularly limited. That is, the auxiliary inner needles may not contact each other. Moreover, it is not necessary to provide slits in all the sub-flow channels. The opening of the sub-channel may not be slit-like, and for example, a plurality of small holes may be arranged in the axial direction, or may be formed by one opening such as a circle or a rectangle. Furthermore, an opening can be formed on the outer peripheral surface of the outer catheter 2 at a position corresponding to the first flow path 12a into which the main inner needle 14 is inserted. That is, at least one slit 13a, 13b formed in the second and third flow paths 12b, 12c and other shapes (circular, rectangular, elliptical, etc.) can be formed. In addition, the number of sub-channels and the number of sub-inner needles of the present invention do not necessarily match, and the number of sub-channels may be large.

1 Trocar Catheter 12a First channel (main channel)
12b Second channel (sub-channel)
12c 3rd channel (sub-channel)
13a, 13b Slit (peripheral surface opening)
13 Inner needle 14 Main inner needle 15 Sub inner needle 17 Lock ring (coupling mechanism)
2 Mantle catheter 3 Hub (coupling mechanism)
4 Drainage part 6 Slit part 71 Tip opening 8 Liquid collection part 9 Mark

Claims (8)

A sheath catheter,
An inner needle inserted through the outer catheter;
With
The mantle catheter is
A cylindrical drainage section;
A cylindrical liquid collection part connected to the distal end side of the drainage part,
The liquid collection part has a plurality of flow paths partitioned by partition walls in a cross section,
The plurality of flow paths are composed of at least one main flow path and at least one sub flow path, and both the main flow path and the sub flow path communicate with the internal space of the drainage part,
The axial end of the main channel opens to the outside through a tip opening formed at the tip of the liquid collection part,
An end portion in the axial direction of the sub-flow channel terminates inside the liquid collection unit, and at least one of the sub-flow channels passes through a peripheral surface opening formed on the outer peripheral surface of the liquid collection unit. Open to the outside in the radial direction,
The inner needle is
At least one main inner needle that is inserted into each of the main flow paths and accommodated so as to protrude from the tip opening of the liquid collection part;
And at least one sub-inner needle inserted into each sub-channel,
The main inner needle and the sub inner needle are held in a state where at least the tip side is bundled so as to be separated from each other ,
A trocar catheter in which a linear mark extending in the axial direction along the main flow path or the sub flow path is provided on an outer peripheral surface or an inner peripheral surface of the outer catheter.   The trocar catheter according to claim 1, wherein the peripheral surface opening is formed in a slit shape extending along an axial direction of the liquid collection part.   The trocar catheter according to claim 1 or 2, wherein a distal end of the sub-flow channel is disposed on a distal end side with respect to the peripheral surface opening. The main flow path and the main inner needle are provided one by one,
2 to 4 each of the sub-channel and the sub-inner needle are provided,
The trocar catheter according to any one of claims 1 to 3, wherein each of the sub-flow channels opens to the outside through the peripheral surface opening. The inner wall surface of the drainage portion of the mantle catheter, trocar catheter according to the cross-section, the inner needle is formed so as to correspond to the outer shape, any of claims 1 to 4. The trocar catheter according to any one of claims 1 to 5 , further comprising a connection mechanism for detachably connecting a proximal end portion of the outer catheter and a proximal end portion of the inner needle. An outer catheter having an at least one main inner needle and at least one auxiliary inner needle held in a state where at least the distal ends thereof are bundled so as to be separable from each other,
A cylindrical drainage section;
A cylindrical liquid collection part connected to the distal end side of the drainage part,
The liquid collection part has a plurality of flow paths partitioned by partition walls in a cross section,
The plurality of flow paths are composed of at least one main flow path and at least one sub flow path, and both the main flow path and the sub flow path communicate with the internal space of the drainage part,
The axial end of the main channel opens to the outside through a tip opening formed at the tip of the liquid collection part,
An end portion in the axial direction of each sub-flow channel terminates inside the liquid collection unit, and at least one of the sub-flow channels passes through a peripheral surface opening formed on the outer peripheral surface of the liquid collection unit. Open to the outside in the radial direction,
Each main inner needle is inserted into each main flow path and accommodated so as to protrude from the tip opening of the liquid collection part, and each sub inner needle is inserted into each sub flow path Configured ,
A sheath catheter, wherein a linear mark extending in the axial direction along the main channel or the sub-channel is provided on an outer peripheral surface or an inner peripheral surface of the sheath catheter. A cylindrical liquid collection part and a cylindrical liquid collection part connected to the distal end side of the liquid discharge part, the liquid collection part has a plurality of flow paths partitioned by a partition wall in a cross section; The plurality of flow paths are composed of at least one main flow path and at least one second flow path, and the main flow path and the sub flow path are both in communication with the internal space of the drainage unit, The axial end of each sub-flow channel opens to the outside through a tip opening formed at the tip of the liquid collection part, and the axial end of each sub-flow channel terminates inside the liquid collection part. In addition, at least one of the sub-flow paths is configured to open to the outside in the radial direction through a peripheral surface opening formed on the outer peripheral surface of the liquid collection part, and is formed on the outer peripheral surface or the inner peripheral surface. is mantle catheter to the primary flow passage or linear marks extending in the axial direction along the sub-passage is provided To, a inner needle to be inserted,
At least one main inner needle that is inserted into each of the main flow paths and accommodated so as to protrude from the tip opening of the liquid collection part;
And at least one sub-inner needle inserted into each sub-channel,
The main inner needle and the sub-inner needle are inner needles that are held in a state where at least the distal ends are bundled so as to be separated from each other.