JP2011004977A - Catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter which can ameliorate the blocking of a through-hole by bio-tissue while retaining the effective size of the through-hole necessary for discharging and suction.SOLUTION: The catheter 1 is inserted into the bio-tissue of a mammal including a human being, and has a lumen 7 in the interior and a slender body 2 having at least one through-hole 6 communicating with the lumen 7. In the through-hole 6, the cross-sectional area in the direction vertical to the axis (a) of the through-hole 6 is unevenly formed, and a narrowest site A exists in the position other than the position where the depth from the surface of the body 2 is zero, and the brim of a site B nearer to the surface of the body 2 than to the narrowest site A in the through-hole 6 functions as a contact prevention portion which prevents the narrowest site A of the through-hole 6 from coming into direct contact with the bio-tissue.

Description

  The present invention relates to a catheter that is punctured into a living tissue of a mammal including a human.

  2. Description of the Related Art Conventionally, catheters that are punctured into living tissues of mammals including humans and are used for administration of drugs and aspiration of body fluids are known. Such a catheter has a lumen inside, and has at least one through hole communicating with the lumen at the tip or side. Then, administration of a drug or the like into the living tissue or suction of a body fluid or the like from the living tissue is performed via the through hole.

  In Patent Document 1, a portion of the main body portion placed in the abdominal cavity is made of a shape memory resin, and expands outward with respect to the main body portion at a temperature higher than the memory shape recovery temperature. The catheter which has the latching | locking part used as the shape which can be latched in is described.

JP-A 64-68275

  However, the conventional catheter has a problem in that when the biological tissue directly contacts the through hole, the through hole is blocked by the biological tissue, and there is a case where the discharge of the medicine or the like or the suction of the body fluid may be hindered. .

  Here, if the cross-sectional area of the through hole is increased in order to improve the blockage of the through hole, the discharge amount of the medicine or the like increases, and the discharge amount may exceed the desired discharge amount into the living tissue. was there.

  The present invention has been made in view of the above, and provides a catheter capable of improving the blockage of a through-hole by a living tissue while maintaining the effective through-hole size necessary for ejection and suction. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, a catheter according to the present invention is a catheter that is pierced into a living tissue of a mammal including a human, and has a lumen therein, and communicates with the lumen. And a contact prevention unit that has an elongated casing formed with at least one through hole and prevents the narrowest part of the through hole from coming into direct contact with the living tissue. To do.

  Further, in the catheter according to the present invention, in the above invention, the through hole has a non-uniform cross-sectional area in a direction perpendicular to the axis of the through hole, and the depth from the surface of the casing is other than zero. The narrowest part is located at a position, and an edge of a part closer to the housing surface than the narrowest part in the through-hole is the contact preventing portion.

  Further, in the catheter according to the present invention, in the above invention, a concave portion is provided on the side surface of the casing, the through hole is located inside the concave portion, and an edge of the concave portion is the contact preventing portion. It is characterized by.

  The catheter according to the present invention is characterized in that, in the above invention, the concave portion is provided over the entire circumference of the catheter.

  In the catheter according to the present invention as set forth in the invention described above, the through hole is provided on a side surface of the housing, and the contact prevention portion is a protrusion provided on the side surface of the housing.

  In the catheter according to the present invention as set forth in the invention described above, the protrusion is an annular protrusion surrounding the through hole.

  In the catheter according to the present invention, the protrusion is a flange.

  Further, in the catheter according to the present invention, the casing has an area where irregularities can be formed on the surface by applying external force on at least a part of the side surface, and the through hole is located in the area, and the contact The prevention unit is realized by unevenness formed in the region.

  The catheter according to the present invention is characterized in that, in the above invention, the catheter has a porous material interposed between the through hole and the living tissue.

  According to the present invention, there is an elongated casing having a lumen inside and at least one through hole communicating with the lumen, and the narrowest part of the through hole is in direct contact with the living tissue. The contact prevention part is provided, and this contact prevention part can improve the blockage of the through-hole due to the living tissue while maintaining the effective through-hole size necessary for ejection and suction. .

1 is a perspective view showing the configuration of a catheter according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view showing the overall configuration of the catheter shown in FIG. 1 and an enlarged configuration of a through hole provided in the catheter. FIG. 3 is a perspective view illustrating a state where a porous material sheet is provided on the catheter illustrated in FIG. 1. FIG. 4 is a cross-sectional view showing the configuration in the vicinity of the through hole of the catheter according to the second embodiment of the present invention. FIG. 5A is a perspective view illustrating a state in which the concave portion of the catheter illustrated in FIG. 4 is filled with a porous material. FIG. 5-2 is a perspective view showing a modification in which the shape of the concave portion of the catheter shown in FIG. 4 is changed. FIG. 5-3 is a perspective view showing a modification in which the shape of the concave portion of the catheter shown in FIG. 4 is changed. FIG. 5-4 is a perspective view illustrating a configuration in which two through holes are provided in the concave portion of the catheter illustrated in FIG. 5-5 is a perspective view illustrating a configuration in which a through hole having a rectangular cross section is provided in the concave portion of the catheter illustrated in FIG. 5-6 is a perspective view illustrating a configuration in which the concave portion of the catheter illustrated in FIG. 5-5 is replaced with a weight having a rectangular cross-sectional shape. FIG. 6A is a perspective view illustrating a configuration in which the concave portion of the catheter illustrated in FIG. 5A is a concave portion formed over the entire circumference of a part of the side surface of the catheter. FIG. 6B is a perspective view illustrating a configuration in which a plurality of through holes provided in the concave portion of the catheter illustrated in FIG. 6A are provided. FIG. 7-1 is a perspective view illustrating a configuration in the vicinity of the through hole of the catheter according to the third embodiment of the present invention. 7-2 is a cross-sectional view illustrating a configuration in the vicinity of the through hole of the catheter illustrated in FIG. FIGS. 8-1 is a perspective view which shows the structure of the through-hole vicinity of the catheter concerning the modification of Embodiment 3 of this invention. FIGS. FIG. 8-2 is a cross-sectional view illustrating a configuration in the vicinity of the through hole of the catheter illustrated in FIG. FIG. 9-1 is a perspective view illustrating a configuration in the vicinity of a through hole of a catheter according to a modification of the third embodiment of the present invention. 9-2 is a cross-sectional view illustrating a configuration in the vicinity of the through hole of the catheter illustrated in FIG. FIG. 10 is a perspective view showing a configuration in the vicinity of a through hole of a catheter according to a modification of the third embodiment of the present invention. FIG. 11: is a perspective view which shows the structure of the through-hole vicinity of the catheter concerning Embodiment 4 of this invention. FIG. 12 is a perspective view showing a configuration in the vicinity of a through hole of a catheter according to a modification of the fourth embodiment of the present invention.

  Hereinafter, with reference to drawings, the catheter which is a form for carrying out this invention is explained.

(Embodiment 1)
1 is a perspective view showing the configuration of a catheter according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view showing the overall configuration of the catheter shown in FIG. 1 and an enlarged configuration of a through hole provided in the catheter. The catheter 1 is punctured into a living tissue of a mammal including a human. The catheter 1 has an elongated cylindrical housing 2 and is provided with a distal end portion 3 having a pointed tip 4 at the distal end. The casing 2 is formed of a material such as silicon, Teflon (registered trademark), polyvinyl chloride, or polyethylene. A lumen 7 is formed inside the housing 2, and at least one through hole 6 that communicates the lumen 7 with the outside of the catheter 1 is formed. The lumen 7 is formed with a proximal end opening 5 on the proximal end side of the catheter 1.

  When a drug or the like is administered to a living tissue using the catheter 1, the drug or the like sent from a pump (not shown) enters the lumen 7 from the proximal end side opening 5 and passes through the through hole 6 to the outside of the catheter 1. It is discharged toward the living tissue. Further, when a body fluid or the like is sucked from the living tissue using the catheter 1, the body fluid or the like of the living tissue is passed through the through-hole by sucking the lumen 7 from the proximal end side opening 5 by a pump or the like (not shown). 6 is sucked out of the body through the lumen 7 and the proximal opening 5. In addition, in FIG. 1 and FIG. 2, although the two through holes 6 are shown, it is not restricted to this, The through hole 6 may be one or more.

  As shown in FIG. 2B, the through hole 6 has a non-uniform cross-sectional area in a direction perpendicular to the axis a of the through hole 6. That is, the through-hole 6 is not a straight columnar space, and the diameter of the through hole 6 is d on the surface of the housing 2, but the narrowest part A is c (c <d) at a deeper position. Is provided. In this way, the through hole 6 has the narrowest portion A formed at a position where the depth from the surface of the housing 2 is not zero, and the portion closer to the surface of the housing 2 than the narrowest portion A. There is a part B wider than A.

  Here, regarding the discharge amount of the medicine or the like in the through hole 6 and the suction amount of the body fluid or the like, the diameter c of the narrowest part A acts as the effective diameter of the through hole 6. On the other hand, the possibility of blocking the through-hole 6 by the living tissue functions as a contact prevention unit that prevents the portion A having the narrowest edge 6b of the portion B from coming into direct contact with the living tissue. For this reason, the site | part A does not contact a biological tissue directly, but the outermost diameter d of the site | part B which contacts a biological tissue acts as a diameter of the effective through-hole 6 with respect to a biological tissue. Therefore, the catheter 1 can improve the blockage of the through-hole 6 due to the living tissue while maintaining the effective through-hole size related to discharge and suction. Furthermore, since the through-hole 6 is formed so that the cross-sectional shape expands from the part B toward the part A, it is possible to spread the medicine or the like widely to the living tissue. However, although the cross-sectional shape of the through hole 6 has been described as a circular shape, the cross-sectional shape of the through hole 6 is not limited to a circular shape. For example, the cross-sectional shape of the through hole 6 may be a rectangle or an ellipse.

  In addition, as shown in FIG. 3, the sheet | seat of the porous material (For example, PTFE, specifically expanded porous PTFE (ePTFE: Japan Gore-Tex Co., Ltd. product)) interposed between the through-hole 6 and the biological tissue. 8 may be provided. In this way, the discharge amount and speed of the medicine and the like are leveled, and more stable discharge is possible over a long period of time.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the cross-sectional shape of the through hole 6 itself is formed non-uniformly. However, in this second embodiment, the recess 10 is formed on the side surface of the housing 2 as shown in FIG. In addition, a through hole 11 having a simple shape such as a cylindrical shape is formed inside the recess 10. In the second embodiment, the edge 10b of the recess 10 functions as a contact prevention unit. And since the through-hole 11 is provided in the lumen 7 side rather than the contact prevention part, while being able to improve obstruction | occlusion of the through-hole 11 by a biological tissue, when discharging a chemical | medical agent etc., a chemical | medical agent with respect to a biological tissue Etc. can be spread widely.

  In addition, as shown in FIG. 3, you may provide the sheet | seat 8 of a porous material so that the recessed part 10 may be covered. Moreover, you may make it fill the inside of the recessed part 10 or the inside of the recessed part 10 and the through-hole 11 with a porous material. For example, as shown in FIG. 5A, the recess 10 may be filled with a porous material 12. As a result, similarly to the first embodiment, the discharge amount and speed of the medicine and the like are leveled, and more stable discharge can be performed over a long period of time.

  Moreover, the recessed part 10 or the through-hole 11 can be made into various shapes, as shown to FIGS. 5-2-FIGS. 5-6, and the number of the through-holes 11 is also arbitrary. In FIG. 5B, a conical recess 10-2 having a substantially cross-shaped cross section is formed, and a porous material 12-2 is filled in the recess 10-2. Moreover, in FIG. 5-3, it is set as the recessed part 10-3 whose cross-sectional shape is a rectangular box shape, and the porous material 12-3 is filled in this recessed part 10-3. Further, in FIG. 5-4, a conical concave portion 10-4 having an elliptical cross-sectional shape is formed, and the porous material 12-5 is filled in the concave portion 10-4 and two through holes 11 are formed. Provided. 5-5, the concave portion 10-5 is the same as that shown in FIG. 5-4, and the concave portion 10-5 is filled with the porous material 12-5, and has a slot shape, that is, an elongated rectangular cross-sectional shape. A through hole 11-5 having the above is provided. Further, in FIG. 5-6, a pyramid-shaped recess 10-6 having a rectangular cross-sectional shape is formed, and the recess 10-6 is filled with a porous material 12-6, and the recess 10-6 Similarly to the through hole 11-5 shown in FIG. 5-5, a through hole 11-6 having a slot-like cross-sectional shape is provided at the bottom.

  Moreover, the recessed part 11 shown in FIG. 4 is good also as the recessed part 13 formed over the perimeter of the housing 2, as shown to FIGS. 6-1 and 6-2. The number of through holes 11 may be one as shown in FIG. 6A or a plurality of through holes 11 as shown in FIG. 6-2.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. In the second embodiment described above, the concave portion 10 is formed and the through hole 11 is provided in the vicinity of the bottom of the concave portion 10. In the third embodiment, the through hole is provided on the side surface of the housing 2, and A protrusion that functions as a contact prevention portion is provided on the side surface of the housing 2.

  FIG. 7-1 is a perspective view of a partial configuration of the catheter according to the third embodiment of the present invention. FIG. 7-2 is a cross-sectional view showing a configuration in the vicinity of the through hole of the catheter shown in FIG. As shown in FIG. 7A and FIG. 7B, this catheter is provided with a through hole 21 on the side surface of the housing 2, and an annular protrusion on the side surface of the housing 2 around the outlet side of the through hole 21. 20 is provided. This annular protrusion 20 functions as a contact prevention part. The protrusion 20 forms a recess 20a on the inside thereof, and the through hole 21 is located at the bottom of the recess 20a. In FIG. 7-2, the porous material 22 is filled in the space formed by the recess 20 a and the through hole 21.

  The protrusion 20 is not limited to an annular shape, and may be a conical protrusion 30 in the vicinity of the outlet side of the through hole 31 corresponding to the through hole 21 as shown in FIGS. 8A and 8B, for example. . In this case, the protrusion 30 functions as a contact prevention part. Further, as shown in FIG. 8B, a porous material 32 is provided in the surface of the housing 2 on the through hole 31 side of the protrusion 30 and in the through hole 31.

  Furthermore, as shown in FIGS. 9A and 9B, when a plurality of through holes 41 are provided, a plurality of conical projections 40 may be provided around the group of through holes 41. Also in this case, the plurality of protrusions 40 function as a contact prevention unit. Further, the height and arrangement of the protrusions 40 in this case are preferably such a height and arrangement that the through hole 41 is not covered by the body tissue. In FIG. 9-2, the porous material 42 covers the gaps between the protrusions 40 and the through holes 41.

  Further, as shown in FIG. 10, a flange-like protrusion 50 may be provided around the through hole 51 and on the entire periphery of the housing 2. In this case, the protrusion 50 functions as a contact prevention part. When providing flange-like projections 50 at both ends in the longitudinal direction of the through hole 51, it is preferable to provide a porous material between the projections 50. Further, when the flange-shaped protrusion 50 is provided at one end in the longitudinal direction of the through hole 51, it is preferable to provide a porous material on the side of the housing 2 on the through hole 51 side of the protrusion 50.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. In this Embodiment 4, as shown in FIG. 11, the deformation | transformation part 102 which can form an unevenness | corrugation in the surface of the housing | casing 2 by providing external force is provided in at least one part of the side surface of the housing 2, The through-hole 61 is this It is located in the region within the deformable portion 102.

  In FIG. 11A, by applying a pressing force F that is an external force from both ends of the housing 2, the foldable bellows-shaped deformable portion 102 is deformed, and a projection 71 as shown in FIG. A deformed portion 102 a having a concavo-convex shape is formed on part of the side surface of the housing 2. The through hole 61 is provided in a recessed area sandwiched between the protrusions 71 when the protrusions 71 are formed. Here, the protrusion 71 serves as a contact prevention portion. Note that the shape of the deformable portion 102a is not easily returned to the shape of the deformable portion 102 and is maintained.

  The external force may be a twisting force, heat or electric energy in addition to the pressing force F. In the case of twisting force, for example, by weakening the circumferential strength of a part of the side surface of the housing 2, the weak portion forms a recess, and a through hole is provided in the formed recess. To do. In the case of heat or electric energy, a part of the side surface of the housing 2 can be used as a shape memory member, and by applying heat or electric energy, projections or recesses having a desired shape can be formed.

  In addition, as shown in FIG. 12, by forming a deformed portion 112 having a heat shrink member 82 on a part of the side surface of the housing 2 and applying heat H, as shown in FIG. The heat-shrinkable member 82 may be heat-shrinked, and thereby, a portion of the heat-shrinkable member 82 may form a deformed portion 112a that forms the recess 83. In this case, the edge of the recessed part 83 functions as a contact prevention part. The through hole 81 is disposed so as to be formed in the recess 83.

DESCRIPTION OF SYMBOLS 1 Catheter 2 Housing | casing 3 Front-end | tip part 4 Protrusion end 5 Base end side opening 6, 11, 11-5, 11-6, 21, 31, 41, 51, 61, 81 Through hole 6b, 10b Edge 7 Lumen 8 Sheet 10, 10 -2 to 10-6, 13, 20a, 83 Recess 12, 12-2 to 12-6, 22, 32, 42 Porous material 20, 30, 40, 50, 71 Protrusion 82 Heat shrink member 102, 102a, 112 , 112a Deformation part A, B part a axis c, d diameter

Claims (20)

A catheter that is pierced into the biological tissue of a mammal, including a human,
An elongated housing having a lumen therein and having at least one through hole communicating with the lumen;
A catheter having a contact prevention part for preventing the narrowest part of the through hole from coming into direct contact with the living tissue. The through hole has a non-uniform cross-sectional area in a direction perpendicular to the axis of the through hole, and there is the narrowest part at a position where the depth from the surface of the housing is other than zero,
The catheter according to claim 1, wherein an edge of a portion closer to the surface of the housing than the narrowest portion of the through hole serves as the contact prevention portion. A concave portion is provided on the side surface of the casing,
The through hole is located inside the recess,
The catheter according to claim 1, wherein an edge of the concave portion serves as the contact prevention portion.   The catheter according to claim 3, wherein the concave portion is provided over the entire circumference of the catheter. The through hole is provided on the side surface of the housing,
The catheter according to claim 1, wherein the contact prevention portion is a protrusion provided on a side surface of the housing.   The catheter according to claim 5, wherein the protrusion is an annular protrusion surrounding the through hole.   The catheter according to claim 5, wherein the protrusion is a flange. The casing has a region where irregularities can be formed on the surface by applying external force to at least a part of the side surface,
The through hole is located in the region;
The catheter according to claim 1, wherein the contact prevention unit is realized by unevenness formed in the region.   The catheter according to claim 1, further comprising a porous material interposed between the through hole and the living tissue. A catheter that is pierced into the biological tissue of a mammal, including a human,
An elongated housing having a lumen therein and having at least one through hole communicating with the lumen;
The through hole has a non-uniform cross-sectional area in a direction perpendicular to the axis of the through hole, and has a narrowest part at a position other than zero in depth from the surface of the housing. .   The catheter according to claim 10, further comprising a porous material interposed between the through hole and the living tissue. A catheter that is pierced into the biological tissue of a mammal, including a human,
An elongated housing having a lumen therein and having at least one through hole communicating with the lumen;
A concave portion is provided on the side surface of the casing,
The catheter, wherein the through hole is located inside the recess.   The catheter according to claim 12, wherein the concave portion is provided over the entire circumference of the catheter.   The catheter according to claim 12, further comprising a porous material interposed between the through hole and the living tissue. A catheter that is pierced into the biological tissue of a mammal, including a human,
An elongated housing having a lumen therein and at least one through hole communicating with the lumen on a side surface;
A catheter having protrusions for preventing the living tissue from coming into direct contact with a through hole on a side surface of the housing.   The catheter according to claim 15, wherein the protrusion is an annular protrusion surrounding the through hole.   The catheter according to claim 15, wherein the protrusion is a flange.   The catheter according to claim 15, further comprising a porous material interposed between the through hole and the living tissue. A catheter that is pierced into the biological tissue of a mammal, including a human,
An elongated housing having a lumen therein and at least one through hole communicating with the lumen on a side surface;
The casing has a region where irregularities can be formed on the surface by applying external force to at least a part of the side surface,
The catheter, wherein the through hole is located in the region. A catheter that is pierced into the biological tissue of a mammal, including a human,
An elongated housing having a lumen therein and at least one through hole communicating with the lumen on a side surface;
The catheter further comprising a porous material interposed between the at least one through hole and the living tissue.

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