JP6831955B2 - Branch pipe - Google Patents

Description

The present invention relates to a branch tube used by connecting to a tubular member introduced into the body such as a puncture needle. Specifically, one of the branching passages is used as a passage for drug solution flow, and the other is an introduction to the tubular member lumen. Regarding the branch pipe that was used as the insertion passage.

As a branch pipe connected to the tubular member, one of which is a passage for the flow of the drug solution and the other of which is an insertion passage for the introduction material into the tubular member, for example, the puncture position when puncturing an organ under endoscopic observation. There is a Y-shaped tube (branch tube) used for the light emitting injection needle to confirm the image on the image, and this is a chemical solution tube inserted into one passage of the branch tube connected to the injection needle and injected into the other passage. It is configured by inserting a plurality of optical fibers to be introduced into the needle. (Patent Document 1)

Further, as a means of observing and identifying the tip position of a tubular member such as a puncture needle inserted into the body by recent technology, a light guide member (optical fiber or the like) is inserted into the tubular member as an introduction to the tip. By setting a light absorbing member that absorbs light at the tip of the light guide member and detecting a photoacoustic wave generated from the light absorbing member, the tip position can be clearly observed and specified from outside the living body. Inserts (piercing needle instruments, etc.) suitable for photoacoustic imaging technology are disclosed. (Patent Document 2)

JP-A-2000-312719 Japanese Patent No. 5819387

Here, when an insert for specifying the tip position of a tubular member is to be provided with a chemical solution injection function by photoacoustic imaging of Patent Document 2, one is guided as a connecting tube to the tubular member and the other is guided. A branch tube such as Cited Document 1 used as an insertion passage for an optical member may be applied, but the instrument of Cited Document 1 is premised on use under endoscopic observation, and illuminates an organ with optical fiber light. Appropriate brightness is required to visually recognize the puncture position, and multiple small-diameter optical fibers are used as a bundle in the passage through which the optical fiber of the branch tube passes. Naturally, the needle tube of the puncture needle becomes thick and punctures the human body. Not suitable for entering. On the other hand, in photoacoustic imaging, it is sufficient to detect the photoacoustic wave generated by the light absorbing part, so one optical fiber as an introduction member is sufficient, and the function of one optical fiber in this way is to reduce the diameter of the puncture needle. Although it is advantageous in terms of cost, damage such as breakage is not allowed to maintain the function because there is only one, and it is extremely important to protect the light guide member from damage, so the conventional one is applied as it is. Can't be done.

Therefore, the present invention is a branch tube preferably used for an injection device used by detecting the tip position of a tubular member introduced into the body by photoacoustic imaging and inserting the drug solution into the human body at that position. An object of the present invention is to provide a branch pipe that can be easily incorporated into the injection device without damaging the introduction member (optical fiber or the like).

The branch pipe of the present invention is a branch pipe composed of a main pipe portion and a side pipe portion having a lumen passage in which the tip portion serves as a connecting portion with a tubular member introduced into the body and branches from the tip end side to the proximal end side. there are, said main portion of the lumen passages within that branches a chemical that can flow passage, formed as a through passage for introduction member introduced the side tube portion into the tubular member, the insertion passage of the introducing member Is a small diameter portion that is the first inner diameter portion, a large diameter portion that is a second inner diameter portion that is set on the opening side with a diameter larger than the small diameter portion, and a taper that connects the small diameter portion and the large diameter portion. The inner peripheral surface of the small-diameter portion of the insertion passage was formed by alternately providing a plurality of rows of convex and concave surfaces each formed in the axial direction .

The concave surface and the convex surface formed in the insertion passage of the introduction member have the convex surface as the contact surface with the introduction member and the concave surface as the non-contact surface.

Further, the concave surface and the convex surface formed in the insertion passage of the introduction member have an arcuate shape in which the convex surface is directed from the base surface to the inside of the insertion passage when the concave surface is a circular base surface of the insertion passage. It is preferably formed as a wavy circular shape with a protruding portion.

According to the branch pipe of this means, the insertion passage of the introduction member is provided with the concave surface and the convex surface alternately formed in a plurality of rows in the axial direction, and the convex surface serves as a contact surface with the introduction member and is a concave portion. When the introduction member is inserted into the insertion passage when the diameter of the introduction member and the diameter of the insertion passage are almost the same because the surface becomes the non-contact portion, the introduction member is held by the contact portion and the passage. Since the contact area of the introduction member is reduced, friction is reduced and the insertion is smooth and easy. In addition, the introduction member is fixed in the passage by alternately forming the convex surface and the concave surface in the axial direction. The connection can be ensured by allowing the adhesive to enter the recessed surface.

Since the second inner diameter portion on the opening side has a larger diameter than the first inner diameter portion on the branch portion side and the transition portion is formed as a tapered portion, the inner diameter of the insertion passage of the introduction member and the introduction member Even when the difference in outer diameter is small, it is easy to insert the introduction member into the passage, and when the adhesive is injected into the passage and the introduction member adheres, it is easy to apply the adhesive. The attachment of the member can be facilitated.

In this way, the introduction member can be smoothly and reasonably and smoothly inserted into the insertion passage of the introduction member of the branch pipe, and the introduction member can be reliably held and fixed at an appropriate position, for example, for photoacoustic imaging. Even if only one light guide member (optical fiber or the like) having a small diameter suitable for the injection device is used, it can be easily attached to the injection device and can be a branch pipe that does not damage the light guide member.

The block diagram which shows the embodiment of the branch pipe of this invention. A cross-sectional view of the above-described embodiment in the axial direction. An enlarged view of a side pipe portion in the cross-sectional view. FIG. 3 is a cross-sectional view of a dd cut surface of the above-described embodiment. An enlarged view of the side tube portion within the two-dot chain line circle in the cross-sectional view. An injection needle for photoacoustic imaging using the branch tube of the above form. The block diagram which shows the setting state of the introduction member to the branch pipe of the injection needle.

Hereinafter, embodiments of the branch pipe of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing the appearance of the present embodiment, in which A is a side view and B is a bottom view. FIG. 2 shows a cross-sectional view of the side view in the axial direction, and FIG. 3 shows a partially enlarged view of a side pipe portion of the cross-sectional view. Further, FIG. 4 is a cross-sectional view showing a dd cut surface of FIG. 1, and FIG. 5 is a partially enlarged view of a side pipe portion of the cross-sectional view.

When the puncture needle is inserted into a specific position of the human body, the branch tube of this embodiment is inserted while observing the position of the photoacoustic wave generating part (puncture needle tip) from outside the body using a photoacoustic image. , It is suitably used as a needle base provided with an injection passage for a chemical solution and an insertion passage for a light guide member (optical fiber), which is required for an injection needle for injecting a chemical solution at the specific position. The application of this branch pipe is not limited to this, and may be used for an injection needle or an injection catheter into which a long linear introduction material such as a guide wire is inserted.

The branch pipe 1 includes a tip portion 12 that serves as a connection portion with the puncture needle 2, a main pipe portion 10 that serves as a grip portion of the puncture needle 2 and a main shaft of the branch pipe that extends straight from the tip portion 12, and the main pipe. It is composed of each part of the side tube part 11 that branches at an angle of 30 ° with the axis of the part 10, and is preferably formed as an integrally molded product made of a resin (polycarbonate in this example). Then, in this example, the side tube portion 11 is fitted to the lumen passage described later, the branch portion side is a small diameter portion 111 with a small outer diameter, the opening side is a large diameter portion 112 with a large outer diameter, and the middle is It is formed as a tapered transition portion 113 that inclines from the small diameter portion 111 to the large diameter portion 112.

The puncture needle adhesive portion 120 is opened in the lumen of the branch pipe 1 corresponding to the tip portion 12, and the drug solution injection passage 101 that communicates coaxially with the adhesive portion 120 and serves as the lumen of the main pipe portion 10 extends. At the rear end 13 of the main pipe, the main pipe opening 130 is opened as a connection insertion port for the chemical solution tube 6. On the other hand, the lumen of the side tube portion 11 is formed as an introduction member insertion passage 1110, 1130, 1120 formed by branching and communicating the passage at an angle of 30 ° of the central axis at the branch portion 102 in the middle of the chemical solution injection passage 101. At the rear end portion 14 of the side pipe, the side pipe opening 140 is opened as an insertion port of the insertion member 3.

The chemical injection passage 101 is usually formed by inclining a transition portion having a diameter larger than the opening hole of the puncture needle adhesive portion 120 in a tapered shape, and the rear end side serves as a connection portion with the chemical liquid tube 6 and serves as a main pipe opening. The chemical solution tube 6 is inserted from 130, but in order to facilitate the insertion and to improve the circumference of the adhesive, the vicinity of the opening 130 is formed so as to taper toward the opening side, and the injection passage 101. A step 1011 was provided in the middle to serve as an insertion stopper for the chemical solution tube 6.

In the introduction member insertion passages 1110, 1130, and 1120 branched from the chemical injection passage 101 at the branch portion 102, in this example, the optical fiber 3 and the protective tube (protective tube 4 and reinforcing tube 51) for protecting the optical fiber 3 are inserted and inserted. The first inner diameter portion 1110 which becomes a passage and has a predetermined length on the branch portion 102 side set to an inner diameter slightly larger than the introduction member to be inserted (in this example, the optical fiber 3 covered with the protective tube 4). The predetermined length on the side tube opening 140 side is the second inner diameter portion 1120 set to an inner diameter larger than the first inner diameter portion 1110, and the first inner diameter portion 1110 and the second inner diameter portion 1120. A predetermined length between the two was inclined as a tapered portion 1130 to form a series of passages. Further, in this example, it is easy to insert an introduction member (in this example, an optical fiber 3 coated with a protective tube 4 and further coated with a reinforcing tube 51) in the vicinity of the opening 140 side of the second inner diameter portion 1120. In order to improve the circumference of the adhesive, the adhesive was formed so as to be tapered toward the opening, and the inner diameter thereof was set to a diameter slightly larger than that of the reinforcing tube 51 to be inserted.

In this way, the inner diameter of the introduction member insertion passages 1110, 1130, and 1120 is made larger on the opening side 1120 than on the branch portion side 1110, and the transition portion 1120 is formed in a tapered shape, so that the introduction member is thinly damaged when it is attached. The structure can be such that an easy-to-use optical fiber (including a protective tube) can be easily inserted into the passage and an adhesive can be easily injected.

Further, on the inner peripheral surface of the first inner diameter portion 1110 of the introduction member insertion passage, a plurality of rows (three rows in this example) of convex portion surfaces 1111 and concave surface surfaces 1112 are alternately arranged and formed in the axial direction. The uneven surface of this example is formed as a wavy circular shape in which the concave surface 1112 is the circular base surface of the passage and the convex surface 1111 is the arcuate protruding portion from the base surface toward the inside of the passage.

In this way, the concave surface 1112 and the convex surface 1111 are alternately provided in the axial direction of the introduction member insertion passage, and the convex surface 1111 is provided as the contact surface with the introduction member and the concave surface 1112 in accordance with the outer diameter of the introduction member. By using a non-contact surface, even if the introduction member is thin and easily damaged such as optical fiber 3 (including a protective tube), the contact area at the time of insertion is reduced, so that insertion is smooth and damage is possible. The sex can be reduced. Further, since the introduction member can be reliably held at a specific position by the contact surface during the attachment of the introduction member, the manufacturing can be facilitated by adjusting the position or the like. Further, when the introduction member is adhesively fixed in the insertion passage, the adhesive circulates in the recessed surface 1112 to ensure reliable adhesion.

Next, an embodiment of the injection needle for photoacoustic imaging using the branch tube of the present embodiment will be described with reference to the drawings.
FIG. 6 shows an overall configuration diagram of the injection needle of the present embodiment, and FIG. 7 shows a partially enlarged view showing a state in which an introduction member and a chemical solution tube are attached to the branch pipe. In FIG. 7, the puncture needle is omitted, and only the branch tube is shown as a cross-sectional view.

The injection needle for photoacoustic imaging is a nerve block that can detect the position of the needle tip inserted into the body from outside the body by the photoacoustic wave generated at the needle tip and can inject the drug solution into the position. The puncture needle 2 having a sharp cutting edge at the tip 21, the branch pipe 1 serving as the needle base of the puncture needle 2, and the chemical solution tube 6 connected to the main pipe portion 10 of the branch pipe 1. In addition, the injection group 7 which is the base of the chemical solution tube 6, the optical fiber 3 which is an introduction member of the branch tube 1 to the side tube portion 11, the protective tube 4 and the reinforcing tubes 51 and 52 for protecting the optical fiber 3, and the reinforcing tubes 51 and 52, and It is composed of an optical connector 8 that connects the optical fiber 3 to the light source device.

The piercing needle 2 is made of a stainless steel pipe, and the rear end thereof is inserted into the piercing needle adhesive portion 120 of the branch pipe tip portion 12 and connected by an adhesive, and the optical fiber 3 (in this example, quartz) serves as a light guide member in the lumen. A fiber coated with polyimide) was inserted, and the tip of the optical fiber 3 serving as a light emitting portion was formed by adhering and fixing the tip of the optical fiber 3 serving as a light emitting portion to the inner wall of the tip portion of the needle tube with an adhesive serving as a light absorbing member and fixing the optical fiber 3. .. Here, as the adhesive serving as the light absorbing member, an epoxy resin, a polyurethane resin, a fluororesin, a silicone rubber or the like mixed with a black pigment having good light absorption is used, and the adhesive is pierced by a photoacoustic wave generated from the light absorbing member. The tip of the needle is detected and imaged. The light absorbing member does not have to be an adhesive as long as it is black. In that case, the light absorbing member is bonded to the inner wall of the needle tip with a transparent adhesive.

The optical fiber 3 adhesively fixed to the tip of the piercing needle 2 lumen extends outward from the piercing needle 2 lumen through the optical fiber insertion passages 1110, 1130, and 1120 which are the lumens of the branch tube 1 side tube portion 11. The end is connected to the optical connector 8 to be formed, and the optical fiber 3 is a portion other than the cavity of the piercing needle 2 and the chemical solution injection passage 101, which are required to have a small diameter, and is inserted through an optical fiber. The outer surface, which is the portion after the first inner diameter portion 212 of the passage, is covered with a protective tube 4 for protecting the fiber 3, and further, a connection portion with a branch pipe to which a force such as bending is easily applied, and an optical connector 8 The outer surface of the protective tube 4 is coated with reinforcing tubes 51 and 52 to further protect the optical fiber 3.

Then, the tip of the protective tube 4 covering the optical fiber 3 is inserted into the first inner diameter portion 1110 of the optical fiber insertion passage and fixed by adhesive. At this time, the optical fiber 3 fixed to the tip of the puncture needle 2 with an adhesive is attached. It is held and fixed in a position where there is as little slack as possible in the needle tube lumen. At this time, as described above, the convex surface 1111 and the concave surface 1112 are alternately provided in the axial direction of the first inner diameter portion 1110, and the protective tube 4 is inserted by providing the tapered portion 1130. It is easy to hold at a specific position, and the adhesive easily turns around the tapered portion 1130 and the recessed surface 1112, so that the connection and fixing at the specific position are ensured.

On the other hand, the protective tube 4 is connected and fixed to the first inner diameter portion 1110 in the second inner diameter portion 1120 of the optical fiber insertion passage, and then the reinforcing tube 51 covering the protective tube 4 is inserted and connected and fixed by an adhesive. did.

Further, a chemical solution tube 6 having an injection group 7 at the end is inserted into the chemical solution injection passage 101, which is the lumen of the main pipe portion 10 of the branch pipe 1, up to the step 1011 of the chemical solution injection passage 101, and is connected by an adhesive. Fixed.

1. 1. Branch pipe 10. Main section 101. Chemical injection passage 1011. Step 102. Branch 11. Side tube 111. Small diameter part 1110. Introduction member (optical fiber) insertion passage (first inner diameter part)
1111. Convex surface 1112. Recessed surface 1120. Introduction member (optical fiber) insertion passage (second inner diameter part)
1130. Introduction member (optical fiber) insertion passage (tapered part)
112. Large diameter part 113. Transition part 12. Tip 120. Puncture needle adhesive part 13. Rear end of main pipe 130. Main pipe opening 14. Rear end of side tube 140. Side tube opening 2. Puncture needle 3. Optical fiber 4. Protective tube 51.52. Reinforcing tube 6. Chemical solution tube 7. Injection group 8. Optical connector

Claims (3)

Becomes a connecting portion of the tubular member distal end portion is introduced into the body, from the tip side in the branch pipe comprising a main portion and a side tube portion having a luminal path inner branches proximally of bore path among which the branch The main pipe side is formed as a passage through which the chemical solution can flow, and the side pipe side is formed as an insertion passage for the introduction member introduced into the tubular member, and the insertion passage for the introduction member is a small diameter portion having a first inner diameter portion. It is formed from a diameter portion, a large diameter portion which is a second inner diameter portion set on the opening side with a diameter larger than the small diameter portion, and a tapered portion connecting the small diameter portion and the large diameter portion, and the insertion passage is thin. A branch pipe characterized in that a plurality of rows of convex and concave surfaces, each of which is formed in the axial direction, are alternately provided on the inner peripheral surface of the diameter portion. The branch pipe according to claim 1, wherein the concave surface and the convex surface formed in the insertion passage of the introduction member have the convex surface as the contact surface with the introduction member and the concave surface as the non-contact surface. The concave surface and the convex surface formed in the insertion passage of the introduction member are arcuate protruding portions whose convex surface is directed from the base surface to the inside of the insertion passage when the concave surface is a circular base surface of the insertion passage. The branch pipe according to any one of claims 1 and 2, which is formed as a wavy circular shape.

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