JP6402465B2 - Endoscope injection needle and method for manufacturing endoscope injection needle - Google Patents

Description

  The present invention relates to an endoscope injection needle and a method for manufacturing an endoscope injection needle.

When performing endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) to remove the mucosa of the esophagus, stomach, large intestine, etc. under the endoscope, separation of the mucosa and muscle layer is required There is a case. In this case, an endoscope injection needle having an inner tube having a needle body attached to the tip and an outer tube through which the inner tube can be inserted is inserted, and a physiological saline solution or a drug solution ( In the following, it is usually carried out.
The endoscope injection needle is inserted into a channel provided in a long endoscope having a length of about 1 to 2 m, for example, and punctures the needle body at a predetermined affected area. The liquid is discharged from the distal end of the needle body through the long inner tube from the proximal end side of the endoscope.

  For example, a needle body having an outer diameter of 0.65 mm or less is preferably used in order to reduce the damage when puncturing. On the other hand, in order to reduce the injection resistance, the inner diameter of the inner tube is preferably set to 0.8 mm or more, for example. As a result, a gap was formed between the outer surface of the needle body and the inner surface of the inner tube. An endoscope injection needle provided with a connection member for filling the gap and connecting the outer surface of the needle body and the inner surface of the inner tube is proposed.

For example, an endoscope injection needle (hereinafter also referred to as conventional art 1) described in Patent Document 1 below has a coiled member (connection member) externally fitted to the end opposite to the tip of the needle body. A coiled member is fixed to the needle body, and the inner tube is externally fixed to the coiled member.
By providing the coil-shaped member, a gap between the outer surface of the needle body and the inner surface of the inner tube is filled.

  Patent Document 1 describes that a coil-shaped member having an inner diameter smaller than the outer diameter of the needle body may be fitted onto the needle body. Patent Document 1 describes that the needle body and the coiled member (coil spring) may be fastened by being bonded and fixed using an adhesive.

JP 2009-172029 A

  However, an endoscope injection needle having a connection member that fills a gap between the needle body and the inner tube tube exemplified in the prior art 1 and connects the needle body and the inner tube tube has the following problems. Had.

That is, in the endoscope injection needle inserted through the endoscope, the liquid injected from the proximal end side of the long inner tube is carried to the needle body provided on the distal end side, and the needle body In order to be discharged from the tip, it is necessary to apply a strong discharge pressure to the liquid. The liquid flowing through the inner tube with a strong discharge pressure can give a strong pressure to the boundary between the needle body and the connecting member. As a result, there is a possibility that a gap through which the liquid can flow is formed between the needle body and the connection member. Alternatively, there is a possibility that a slight gap that cannot flow through the liquid formed between the needle body and the connecting member is expanded by the pressure and becomes a gap through which the liquid can flow.
Since the gap through which the liquid can flow is formed between the needle body and the connection member, the watertightness is lowered, and there is a possibility that the liquid leaks to the tip of the connection member.

  The present invention has been made in view of the above problems. That is, the present invention includes an endoscope injection needle having an excellent water-tightness and an internal syringe having a resin layer that joins the needle body and the connection member from the base end surface of the connection member to the space between the needle body and the connection member. Provided is a method for manufacturing an endoscope injection needle.

The endoscope injection needle of the present invention includes an inner tube for injecting a liquid, a needle body provided at the tip of the inner tube, and an insertion hole through which the needle body penetrates in the axial direction. A connecting member disposed between the inner surface of the inner tube and the outer surface of the needle body, and connecting the needle body and the inner tube tube, A resin layer is provided continuously from the base end surface to between the outer surface of the needle body and the inner surface of the connection member, and the distal side of the insertion hole is provided to join the needle body and the connection member. The opening is characterized by expanding from the proximal side to the distal side .

  The method for manufacturing an endoscope injection needle according to the present invention includes an inner tube for injecting a liquid, a needle provided at the tip of the inner tube, and an axial penetrating through the needle. An endoscope having an insertion hole and having a connecting member disposed between the inner surface of the inner tube and the outer surface of the needle body, and connecting the needle body and the inner tube tube A method of manufacturing an endoscope injection needle for manufacturing a medical injection needle, wherein the mold body is a cylindrical body having an inner diameter substantially equal to the outer diameter of the connection member while the needle body is inserted into the insertion hole. A member is externally fitted to the connection member such that the base end of the mold member is positioned closer to the base end side than the base end surface of the connection member, and the base end surface of the connection member and the needle body protruding from the base end surface are made of resin A resin filling step of pouring a resin member into the mold member so as to be embedded with the member, and the resin After the filling step, by inserting the tip of the inner tube tube between the inner surface of the mold member and the outer surface of the connecting member, and pushing the resin member poured into the mold member toward the tip side, The resin member is impregnated from the base end surface of the connecting member between the outer surface of the needle body and the inner surface of the connecting member to form a resin layer that joins the needle body and the connecting member. And a resin layer forming step.

  The endoscope injection needle of the present invention has excellent water-tightness between the needle body and the connection member by having the resin layer described above.

  The method for manufacturing an endoscope needle according to the present invention enables the manufacture of the endoscope needle according to the present invention including the resin layer described above.

1 is an overall view of an endoscope injection needle illustrating an endoscope injection needle according to a first embodiment of the present invention. 2a is an overall view of an endoscope injection needle illustrating the endoscope injection needle of the first embodiment of the present invention, and 2b is a tip of an endoscope injection needle 100 surrounded by a broken-line circle in 2a. It is a longitudinal cross-sectional view of a region. It is a longitudinal cross-sectional view in the front-end | tip area | region of the injection needle for endoscopes which illustrates the injection needle for endoscopes of 1st embodiment of this invention. It is a transverse cross section showing an IV-IV section in a tip field of an endoscope injection needle which illustrates an endoscope injection needle of a first embodiment of the present invention. It is a longitudinal cross-sectional view in the front-end | tip area | region of the injection needle for endoscopes which illustrates the injection needle for endoscopes of 2nd embodiment of this invention. It is explanatory drawing explaining the resin filling process in the manufacturing method of the injection needle for endoscopes of 3rd embodiment of this invention. It is explanatory drawing explaining the resin layer formation process in the manufacturing method of the injection needle for endoscopes of 3rd embodiment of this invention.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and redundant description will be appropriately omitted.
In the present embodiment, there are cases where a vertical direction is defined and illustrated as shown in the figure. However, this is provided for convenience in order to simply explain the relative relationship of the components, and does not limit the direction during the manufacture or use of the product implementing the present invention.
The various components of the endoscope injection needle of the present invention do not have to be independent of each other, a plurality of components are formed as a single member, and a single component is a plurality of members. It is allowed that a certain component is a part of another component, a part of a certain component overlaps a part of another component, and the like.
Further, the various components of the present invention do not exclude the provision of holes, slits, or the like not shown in the individual components as necessary.

In the present invention, the endoscope injection needle or the proximal end portion of each component constituting the endoscope injection needle refers to a predetermined length region including the proximal end of the endoscope injection needle. Similarly, the distal end portion of each of the elongated components constituting the endoscope injection needle or the endoscope injection needle is a predetermined length region including the distal end of the endoscope injection needle Say.
The proximal end of each configuration constituting the endoscope injection needle or the endoscope injection needle is the endoscope injection needle on the operator side of the endoscope injection needle or the configuration of each configuration. Means the end. Endoscopic injection needle or the distal end of each component constituting the endoscope injection needle means an end opposite to the proximal end, and is usually an endoscope injection needle or It means the front end portion on the operation side of the configuration.
Further, in explaining the present invention, unless otherwise specified, the proximal side means the proximal end side of the endoscope injection needle, and the distal side means the distal end side of the endoscope injection needle. means.
Further, in the description of the present invention, unless otherwise specified, the axial direction means the longitudinal direction of the inner tube.
In describing the present invention, the term “inner surface” or “outer surface” may be used as appropriate. Unless otherwise specified, the inner surface means a surface facing the central axis of the endoscope injection needle, and the outer surface has a surface not facing the axis of the endoscope injection needle. means.

<First embodiment>
Below, the main structure of the endoscope needle 100 which is 1st embodiment of the endoscope needle of this invention is demonstrated using FIGS. 1-4. FIG.
FIG. 1 is an overall view of an endoscope injection needle 100 illustrating a first embodiment of the present invention, and shows a state where the tip of a needle body 10 is located inside an outer tube 30.
FIG. 2 a is an overall view of an endoscope injection needle 100 illustrating the first embodiment of the present invention, and shows a state in which the tip of the needle body 10 protrudes more distally than the distal end of the outer tube 30. Show. 2b is a schematic cross-sectional view of the distal end region of the endoscope injection needle 100 surrounded by a broken-line circle in FIG. 2a. In FIG. 2b, the needle body 10 and the connection member 70 are illustrated in a side view for ease of illustration.
FIG. 3 is a longitudinal sectional view in the distal end region of the endoscope injection needle 100. FIG. 3 illustrates the needle body 10 in a side view and the outer tube 30 is omitted for ease of illustration. ing.
4 is a cross-sectional view taken along the line IV-IV in the distal end region of the endoscope injection needle 100 shown in FIG.

As shown in FIG. 3, the endoscope injection needle 100 includes an inner tube 20, a needle body 10, and a connection member 70.
The inner tube 20 is a tube for injecting liquid.
The needle body 10 is provided at the tip of the inner tube 20.
The connecting member 70 has an insertion hole 80 through which the needle body 10 is inserted in the axial direction, and is disposed between the inner surface of the inner tube tube 20 and the outer surface of the needle body 10. The tube 20 is connected.
The endoscope injection needle 100 is a resin layer that joins the needle body 10 and the connection member 70 continuously from the base end surface 73 of the connection member 70 to between the outer surface of the needle body and the inner surface of the connection member 70. 90 is provided.

  For example, the connection member 70 in the present embodiment has a connection portion main body 71 disposed in the inner tube 20 and an outer diameter larger than the inner diameter of the inner tube 20 and is farther from the distal end of the inner tube 20. A large-diameter portion 72 disposed on the rear side. However, the configuration of the connection member 70 is not limited to this, and can be changed as appropriate within a range in which the intended problem of the present invention can be solved.

  Since the endoscope injection needle 100 has the resin layer 90, the needle 10 and the connection member 70 are connected to each other on the proximal end side of the connection member 70 that is strongly influenced by the discharge pressure of the liquid flowing through the inner tube 20. The liquid is prevented from flowing in between. Therefore, the endoscope injection needle 100 is excellent in water tightness between the needle body 10 and the connection member 70.

  When the resin layer 90 is not provided, even if the outer surface of the needle body 10 and the inner surface of the connection member 70 are in close contact with each other before use, for example, the connection is made with the outer surface of the needle body 10 by the liquid discharge pressure. There is a possibility that cracks or peeling may occur between the inner surface of the member 70. A liquid discharge pressure is applied to the crack and the peeling portion, and the separation progresses or the crack progresses to form a gap, so that the watertightness can be lowered. In contrast, since the endoscope injection needle 100 is provided with the resin layer 90 in advance as described above, it can maintain good water tightness.

As shown in FIGS. 3 and 4, the endoscope injection needle 100 according to the present embodiment extends from the proximal end surface 73 of the connection member 70 to at least the vicinity of the proximal side of the insertion hole 80, and the resin layer 90 includes the needle. The entire outer periphery of the body 10 is covered.
According to this configuration, the entire boundary between the connection member 70 and the needle body 10 is covered with the resin layer 90 on the proximal end side of the insertion hole 80, so that the connection member 70 can be applied even when liquid discharge pressure is applied to the boundary. It is well prevented that a gap is formed between the needle body 10 and the needle body 10. Therefore, high water tightness is shown between the connecting member 70 and the needle body 10.

Here, the vicinity of the proximal side of the insertion hole 80 is not strictly limited, and means that it can be confirmed that the resin layer 90 has entered significantly between the needle body 10 and the connecting member 70 from the base end face 73. To do.
For example, the resin layer 90 continuous from the base end surface 73 is about the thickness dimension x (FIG. 3) of the wall surface of the connection member 70 disposed inside the inner tube 20 from the base end to the tip end of the insertion hole 80. More preferably, it extends over the entire outer periphery of the needle body 10 to a distance.
From the standpoint of maintaining higher water tightness, the axis of the connecting member 70 in which the resin layer 90 continuous from the base end face 73 is arranged inside the inner tube 20 from the base end to the tip end of the insertion hole 80. More preferably, it extends to a distance of about one half of the length.

The endoscope injection needle 100 according to the present embodiment has an outer tube 30 as shown in FIGS. 1 and 2a. The endoscope injection needle 100 further includes an operation unit 50 at the proximal end portion.
In the present embodiment, the operation unit 50 includes an outer cylinder grip 40 and an inner cylinder grip 60. The operation unit 50 is a part held by an operator of the endoscope injection needle 100.
The operation unit 50 includes a connector 51 attached to the proximal end side of the inner cylinder grip 60, and can connect a syringe (not shown). The inner tube 20 serves as a flow path for liquid injected from a syringe (not shown) connected to the connector 51. When the operator operates the operation unit 50, the needle body 10 can be stabbed into the affected part of the subject. In addition, an opening (not shown) is provided at the tip of the needle body 10, and an operator can inject liquid into the affected area by operating a syringe (not shown).

The inner cylinder grip 60 moves the needle body 10 back and forth inside and outside the outer tube 30. The inner tube 20 has a needle body 10 and is slidably inserted into the outer tube 30.
Here, when the needle body 10 is moved back and forth inside and outside the outer tube 30, a state in which at least a part of the needle body 10 protrudes from an opening provided somewhere in the outer tube 30 (a protruding state, see FIG. 2 a). ) And a state in which the needle body 10 is accommodated in the opening from the protruding state (accommodated state, see FIG. 1).
In the present embodiment, the opening is provided at the tip of the outer tube 30, but this is only an example, and an opening may be provided at another position.

  The inner cylinder grip 60 is accommodated in the outer cylinder grip 40 so as to be slidable from the proximal end side to the distal end side or from the distal end side to the proximal end side. Further, a guide groove 41 is provided on the side surface of the outer cylinder grip 40, and the protrusion 61 of the inner cylinder grip 60 is fitted into the guide groove 41 so as to be slidable.

In this embodiment, the outer cylinder grip 40 and the outer tube 30 are connected, and the inner cylinder grip 60, the inner tube 20 and the needle body 10 are connected. Therefore, the operator of the endoscope injection needle 100 can advance and retract the needle body 10 in the axial direction by sliding the outer cylinder grip 40 and the inner cylinder grip 60 in the axial direction.
More specifically, when the protruding portion 61 is positioned on the proximal end side of the guide groove 41 provided in the outer cylinder grip 40, the needle body 10 is in the retracted state, and when the protruding portion 61 is positioned on the distal end side of the guide groove 41, the needle body 10 is It protrudes from the outer tube 30.

  In general, the operation unit 50 has a structure for fixing at least one of a stored state and a protruding state. In the present embodiment, a fixing groove for fitting and fixing the protruding portion 61 on the proximal end side and the distal end side of the guide groove 41 is provided. And when the protrusion part 61 is located in the base end side or the front end side of the guide groove 41, the protrusion part 61 is fitted in the fixing groove by sliding the inner cylinder grip 60 and the outer cylinder grip 40 in the rotation direction. be able to. This is an example for fixing the storage state or the protruding state, and other forms may be used.

FIG. 2 b shows a cross-sectional view of the distal end region of the endoscope injection needle 100 in a protruding state. At the distal end of the outer tube 30, a contact portion 31 is provided on which the distal end of the inner tube 20 or the distal end of the connection member 70 can contact. The contact portion 31 is a tapered portion formed by, for example, inclining the distal end of the outer tube 30 about 45 ° radially inward from the proximal side to the distal side. The diameter of the tapered opening is smaller than the outer diameter of the inner tube 20 or the outer diameter of the tip of the connecting member 70.
The connection member 70 is provided with an insertion hole 80 through which the needle body 10 is inserted.

  As the needle body 10, a needle provided in an endoscope injection needle can be appropriately selected and used. In order to reduce the damage at the time of puncture, for example, an outer diameter of 0.65 mm or less is preferably selected, but is not limited thereto. Since the present invention has the connection member 70, the needle body 10 and the inner tube 20 can be connected via the connection member 70 even if there is a significant distance between the outer surface of the needle 10 and the inner tube 20. Can be connected. In other words, by adjusting the thickness of the connection member 70, the needle body 10 having a desired outer diameter can be appropriately selected and used for the inner tube 20 having a fixed inner diameter.

The inner tube 20 has a needle body 10 attached to the distal end thereof, and is slidably inserted through the outer tube 30.
In the present embodiment, the needle body 10 is illustrated as being attached to the forefront of the inner tube 20, but the present invention is not limited to this, and does not hinder the functions necessary for the endoscope injection needle 100. The attachment position may be changed.

The constituent members of the inner tube 20 are not particularly limited. However, since the inner tube 20 slides in the outer tube 30, it is preferable that the inner tube 20 has a certain low friction property and non-adhesiveness, and further has high chemical resistance. In general, a fluororesin such as tetrafluoroethylene polymer (PTFE) or tetrafluoroethylene / perfluoroalkoxyethylene copolymer (PFA), polyamide resin (nylon resin), or the like can be used as the member.
The outer diameter and inner diameter of the inner tube 20 are not particularly limited. For example, the outer diameter can be in the range of 1.2 mm to 1.7 mm, and the inner diameter can be in the range of 0.5 mm to 1 mm.

A portion of the outer tube 30 on the base end side is joined to the inner surface of the outer cylinder grip 40.
In the present embodiment, the inner surface of the outer tube grip 40 and the outer surface of the outer tube tube 30 are illustrated as being joined, but the outer surface of the outer tube grip 40 and the inner surface of the outer tube tube 30 are bonded. It doesn't matter. For joining the outer tube 30 and the outer cylinder grip 40, a fastener (not shown) may be used, or an adhesive may be used.

  Although the constituent member of the outer tube 30 is not particularly limited, it is preferable that the outer tube 30 has a certain low friction and non-adhesiveness because it is inserted into the treatment instrument insertion channel of the endoscope. In general, polyolefin resin, polyamide resin (nylon resin), polyurethane resin, or the like can be used as the constituent member. Moreover, the above-mentioned fluororesin may be used as a constituent member of the outer tube 30.

  An appropriate clearance is provided between the inner surface of the outer tube 30 and the outer surface of the inner tube 20 so that the inner tube 20 can slide smoothly inside the outer tube 30. For example, the outer diameter and inner diameter of the outer tube 30 are not particularly limited. For example, the outer diameter can be in the range of 2 mm to 2.6 mm, and the inner diameter can be in the range of 1.3 mm to 1.9 mm.

  As shown in FIG. 3, the connection member 70 in the present embodiment has a connection portion main body 71 disposed in the inner tube 20 and an outer diameter larger than the inner diameter of the inner tube 20, and is far from the inner tube 20. A large-diameter portion 72 disposed on the distal side of the distal end. In the endoscope injection needle 100, the resin layer 90 is continuously provided from the base end surface 73 to the inner surface of the large diameter portion 72.

That is, the resin layer 90 is provided in a wide range between the outer surface of the needle body 10 and the inner surface of the connection member 70. Therefore, high water tightness is exhibited.
Here, “continuous” means that the resin layer 90 covers the entire outer periphery of the needle body 10 and is provided continuously in the axial direction, and the outer periphery of the needle body 10 is intermittently provided. And the case where it is continuously provided in the axial direction.

The connection member 70 in this embodiment has a substantially uniform inner diameter. The inner diameter of the connecting member 70 is substantially the same as the outer diameter of the needle body 10. Here, “substantially equivalent” means that there is a difference that allows the resin layer 90 to be formed between the inner surface of the connecting member 70 and the outer surface of the needle body 10.
The outer diameter of the connecting portion main body 71 is substantially the same as the inner diameter of the inner tube 20.
The connection member 70 is a cylindrical body, for example, a cylindrical body.
The outer diameter of the large diameter portion 72 in the present embodiment is smaller than the outer diameter of the inner tube 20. Further, the axial length of the large diameter portion 72 is significantly shorter than that of the connecting portion main body 71. For example, when the axial length is in the protruding state (FIG. 2b), the contact portion 31 and the contact portion 31 It can be set to a dimension equal to or less than the distance from the tip of the inner tube 20 that abuts.
In this embodiment, both the connection part main body 71 and the large diameter part 72 have a cylindrical outer shape.

  The constituent members of the connecting member 70 are not particularly limited. For example, the connection member 70 is made of a resin member formed by insert molding, a coil made of a coil, in particular, a coil made of a metal linear member, or a metal material such as stainless steel, as in the prior art 1 described above. The aspect which consists of a cylindrical body with a substantially flat wall surface is included.

  For example, when the connection member 70 is an aspect formed of a resin member that covers the outer periphery of the needle body 10 by insert molding, the following resin layer 90 is preferably provided. That is, a gap along the outer surface of the needle body 10 may be formed in advance between the connection member 70 and the needle body 10 in a partial region on the proximal end side, and the resin layer 90 may be provided so as to fill the gap. . Thereby, since the interface which consists of a different material is formed in the outer surface of the needle body 10, and peeling progress from a base end side is prevented, watertightness improves.

  The resin layer 90 is composed of a resin member that can join the outer surface of the needle body 10 and the inner surface of the connection member 70. The resin member is not particularly limited. For example, a resin member that can be used as an adhesive such as an epoxy resin, a urethane resin, or a cyanoacrylate resin, or a thermoplastic resin such as an ABS resin, a polyamide resin, or a urethane resin can be given as an example. be able to.

As shown in FIG. 3, in the present embodiment, the needle body 10 has a proximal side extending portion 12 that extends to the proximal side with respect to the proximal end surface 73 of the connecting member 70. The endoscope injection needle 100 includes a resin filling portion 110 that is continuous from the resin layer 90 and fills between the outer surface of the proximal extension portion 12 and the inner surface of the inner tube 20.
The proximal extension portion 12 is a portion protruding from the connection member 70 on the proximal end side of the needle body 10.

  The resin filling part 110 can be integrally formed with the resin layer 90 by the same material as the resin member constituting the resin layer 90. In addition, the resin filling portion 110 is a mode in which a resin member that is the same as or different from the resin member constituting the resin layer 90 is used and formed at a step different from the step of forming the resin layer 90 and the interface thereof is joined. Also good.

In general, in the needle body 10 having the proximal side extending portion 12, the bending rigidity is small in the vicinity of the boundary between the needle body 10 in the connection member 70 and the needle body 10 in the proximal side extending portion 12. Therefore, when a force is applied in the bending direction on the proximal end side of the needle body 10, the needle body 10 may be plastically deformed in the vicinity of the boundary.
On the other hand, the resin filling portion 110 acts as a buffer region that can gradually change the difference in rigidity between the needle body 10 exposed in the space 130 and the needle body 10 existing in the connection member 70, and the problem of the plastic deformation described above. Can be avoided.

  Although the axial length of the resin filling part 110 is not particularly limited, it is preferable that the axial length of the connecting member 70 disposed in the inner tube 20 is approximately equal to or longer than the axial length of the connecting member 70. Thereby, the effect which avoids plastic deformation can be exhibited more favorably.

  The axial length of the resin filling portion 110 can be calculated, for example, by measuring four axial lengths at a 90 ° pitch on the outer peripheral surface of the resin filling portion 110 and averaging them. The axial length of the connecting member 70 and the axial length of the resin filling portion 110 are substantially equal to each other. The axial length of the resin filling portion 110 is in the range of 90% to 110% with respect to the axial length of the connecting member 70. including.

The endoscope injection needle 100 according to this embodiment further includes a second resin layer 92 in addition to the resin layer 90.
In other words, the endoscope injection needle 100 is formed between the stepped surface 74 formed by the difference between the outer diameter of the large diameter portion 72 and the outer diameter of the connection portion main body 71 and the distal end surface 75 of the inner tube 20. Two resin layers 92 are provided.

By having the second resin layer 92, the stepped surface 74 and the tip of the inner tube 20 can be reliably bonded. Therefore, a crack is prevented at the boundary between the large diameter portion 72 and the inner tube 20 tip, and a gap is prevented from being formed between them. Therefore, the water tightness between the stepped surface 74 and the inner tube 20 is good.
In addition, the needle body 10 and the connecting member 70 are joined via the resin layer 90, and the connecting member 70 and the inner tube tube 20 are joined via the second resin layer 92, whereby the needle body 10 and the inner tube are joined. The tube 20 can be indirectly connected.

  Although not shown in FIG. 3, in the present embodiment, a third resin layer may be provided between the outer surface of the connection member 70 and the inner surface of the inner tube 20. For example, the third resin layer can be provided continuously with the second resin layer 92. If the third resin layer is provided continuously with the second resin layer 92, the third resin layer is reliably formed between the outer surface of the connecting member 70 and the inner surface of the inner tube 20. This can be confirmed by visually confirming the second resin layer 92. By providing the third resin layer, the reliability of the bonding strength between the inner tube 20 and the connecting member 70 is improved. For the third resin layer described above, the third resin layer 98 shown in the third embodiment to be described later is referred to as appropriate.

<Second embodiment>
Next, an endoscope injection needle 200 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a longitudinal sectional view in the distal end region of the endoscope injection needle 200 according to the second embodiment of the present invention. The connecting member 70 is configured in the same manner as the endoscope injection needle 100 except that the shape of the connecting member 70 is different.

The endoscope injection needle 200 has a reduced diameter region 95 in which the insertion hole 80 in the connection member 70 is reduced in diameter in a predetermined region. In the endoscope injection needle 200, the outer surface of the needle body 10 and the inner surface of the connection member 70 are joined and fixed by abutting the axial intermediate portion of the reduced diameter region 95 with the outer surface of the needle body 10. Has been. A portion where the outer surface of the needle body 10 and the inner surface of the connecting member 70 are joined and fixed is referred to as a fixing portion 94.
In the endoscope injection needle 200 according to the present embodiment, the resin layer 90 is continuous over the vicinity of the proximal side of the fixing portion 94.
The reduced diameter region 95 is continuously reduced in diameter toward the fixing portion 94 on the proximal side and the distal side of the fixing portion 94.

If there is a gap on the proximal side of the fixing portion 94, stress due to the discharge pressure of the liquid concentrates on the proximal end of the fixing portion 94, and the fixing portion 94 is liable to crack. By providing the resin layer 90, it is possible to satisfactorily prevent the fixing portion 94 from being cracked.
Further, the resin layer 90 continuously extends from the base end face 73 to the vicinity of the proximal side of the fixing portion 94, whereby excellent water tightness is exhibited.

  Here, the vicinity of the proximal portion of the fixing portion 94 means a point closer to the fixing portion 94 than at least a half point between the proximal end of the fixing portion 94 and the base end surface 73, and the reduced diameter region shown in FIG. It includes either a point distal to the proximal end of 95 or a point proximal. From the viewpoint of ensuring a sufficient axial length distance of the resin layer 90, a mode in which a part of the distal end of the resin layer 90 enters the reduced diameter region 95 is preferable, and all the distal ends are contracted. A mode of entering the diameter region 95 is more preferable.

The fixing portion 94 directly or indirectly joins the outer surface of the needle body 10 and the inner surface of the connection member 70 to fix the positional relationship with each other. The means for forming the fixing portion 94 is not particularly limited.
For example, when the connecting member 70 is made of a resin member, a heat shrink member is arranged in the circumferential direction of the outer surface of the connecting member 70 through which the needle body 10 is inserted, and the heat shrink member is heated to make the connecting member 70 radial. The fixing portion 94 can be formed by tightening inward. When the connecting member 70 is made of a metal material, a predetermined region of the connecting member 70 through which the needle body 10 is inserted is heated in the circumferential direction to thermally melt the needle body 10 and the connecting member 70, thereby fixing the fixing portion 94. It may be formed. Alternatively, when the connection member 70 is made of a metal material, the fixing member 94 may be formed by caulking the connection member 70 through which the needle body 10 is inserted to physically contact the needle body 10 and the connection member 70. . By caulking the connection member 70, a recess 96 that is a caulking trace is formed on the outer surface of the connection member 70.

  In the case where the needle body and the connection member are fixed in the fixing portion 94 by physical means such as caulking, the water tightness in the fixing portion 94 may not be sufficient. For example, it is possible to form the fixing portion 94 that fixes the needle body 10 inserted through the inside and the connecting member 70 by caulking about two to four places in the circumferential direction on the outer surface of the connecting member 70. However, in such a case, in the circumferential direction of the fixing portion 94, there may be a portion where the needle body 10 and the connection member 70 are closely joined and a gap. Therefore, in the aspect of the endoscope injection needle 200 in which the fixing portion 94 is formed by physical means such as caulking, it is particularly effective to provide the resin layer 90 in order to solve the intended problem of the present invention. is there.

  The reduced diameter region 95 includes the fixing portion 94 and the proximal side and the distal side of the fixing portion 94, and the diameter of the insertion hole 80 is relatively reduced. For example, the diameter of the insertion hole 80 in the reduced diameter region 95 is smaller than the diameter of the insertion hole 80 in the proximal end portion of the connection member 70 as shown in FIG. The reduced diameter region 95 in the present embodiment is provided in the large diameter portion 72 as shown in FIG. 5, but may be provided in the connection portion main body 71 as a modified example not shown. The endoscope injection needle 200 has a concave portion formed on the outer surface of the large diameter portion 72 by caulking the outer peripheral surface of the large diameter portion 72. The inner surface protrudes inward in the radial direction in conjunction with the recess of the recess, and a fixing portion 94 is formed. The inner diameter surface of the insertion hole 80 on the distal side and the proximal side of the fixed portion 94 is inclined with the fixed portion 94 as an apex to form a reduced diameter region 95.

  In the endoscope injection needle 200 according to the present embodiment, a joint 97 that joins the outer surface of the needle body 10 and the inner surface of the connection member 70 may be provided on the distal side of the resin layer 90. In the present embodiment, the fixing portion 94 described above is also used as the joint portion 97. A space 140 is provided between the inner surface of the distal end including the distal end of the large diameter portion 72 and the outer surface of the needle body 10 facing the inner surface on the distal side of the joint 97. ing.

For example, as shown in FIG. 5, the joint portion 97 can be provided in the large diameter portion 72, but is not limited thereto, and may be provided in the connection portion main body 71.
At the joint 97, the outer surface of the needle body 10 and the inner surface of the connection member 70 are in direct or indirect contact. The contact state at the joint portion 97 includes the fixed state of the fixing portion 94. Further, the means for forming the joint portion 97 can follow the means for forming the fixing portion 94.
As a modification of the present embodiment, a joint portion 97 (not shown) that is different from the fixed portion 94 may be provided, or only the joint portion 97 may be provided in a mode in which the fixed portion 94 is not provided. .
The gap 140 is continuous from the distal end of the joint 97 to the distal end of the connecting member 70.

According to the endoscope injection needle 200 having the joint portion 97, the outer surface of the needle body 10 has at least two axial regions including the resin layer 90 and the joint portion 97 from the proximal end side of the connection member 70. Abuts the inner surface. When a force in the bending direction is applied to the needle body 10 on the distal side of the joint portion 97, the needle body 10 moves in the gap 140 and can be bent slightly. It is possible to avoid the needle body 10 from being damaged by the force due to the bending of the needle body 10 as described above.
Further, when the needle body 10 is bent by the force, a load is applied to the joint portion 97 located on the distal side of the resin layer 90, so that the needle body 10 fixed by the resin layer 90 and the connection member 70 are separated. Is prevented. Therefore, while maintaining the watertightness between the needle body 10 and the connecting member 70, which is an intended subject of the present invention, the tip of the needle body 10 is allowed to be slightly curved, and the needle body 10 is bent by a force in the bending direction. To prevent damage.

In the endoscope injection needle 200 having the joint portion 97, for example, as shown in FIG. 5, the distal opening of the insertion hole 80 may have a diameter increasing from the proximal side toward the distal side.
That is, the distal end portion of the gap 140 continuously increases in diameter from the proximal side toward the distal side, and opens at the distal end of the connection member 70. According to such a configuration, the tip of the needle body 10 can be bent more greatly, and thus the above-described damage prevention effect of the needle body 10 is great.

  As illustrated in FIG. 5, the outer diameter of the large diameter portion 72 in the second embodiment is substantially equal to the outer diameter of the inner tube 20. Further, the axial length of the large diameter portion 72 is substantially equal to or longer than the connection portion main body 71. For example, when the shaft length is in the protruding state, the contact portion 31 and the tip of the large diameter portion 72 can be contacted. The connection member 70 in the present invention is not limited to the embodiment specifically shown in the first embodiment and the second embodiment. For example, the connection member 70 does not have the large-diameter portion 72 and is substantially not illustrated. Alternatively, it may be a cylindrical body having a substantially uniform inner diameter and outer diameter.

<Third embodiment>
Next, a method for manufacturing an endoscope injection needle (hereinafter also simply referred to as “the present manufacturing method”) according to a third embodiment of the present invention will be described with reference to FIGS. This manufacturing method will be described taking a method of manufacturing the endoscope injection needle 200 as an example.
FIG. 6 is an explanatory view illustrating a resin filling step in the method for manufacturing an endoscope injection needle according to the third embodiment of the present invention.
FIG. 7 is an explanatory view illustrating a resin layer forming step in the method for manufacturing an endoscope injection needle according to the third embodiment of the present invention.

This manufacturing method is a method of manufacturing an endoscope injection needle having the inner tube 20, the needle body 10, and the connection member 70.
The inner tube 20 is a tube for injecting liquid, and the needle body 10 is provided at the tip of the inner tube 20. The connecting member 70 has an insertion hole 80 through which the needle body 10 is inserted in the axial direction, and is disposed between the inner surface of the inner tube tube 20 and the outer surface of the needle body 10. The tube 20 is connected.
For example, when the connection member 70 including the connection portion main body 71 and the large diameter portion 72 is used, the inner diameter of the mold member 300 described later is substantially equal to the outer diameter of the large diameter portion 72.

This manufacturing method includes a resin filling step and a resin layer forming step.
In the resin filling step, the needle body 10 is inserted into the insertion hole 80, and the mold member 300, which is a cylindrical body having an inner diameter substantially equal to the outer diameter of the connection member 70, is more proximal than the base end surface 73 of the connection member 70. The base end of the formwork member 300 is positioned on the side so as to be fitted on the connecting member 70 (large diameter portion 72). In addition, in the resin filling step, the resin member 120 is poured into the mold member 300 so that the base member 73 protruding from the base end surface 73 and the needle body 10 protruding from the base end surface 73 is embedded with the resin member 120.
The resin layer forming step is performed after the resin filling step. In the resin layer forming step, the tip of the inner tube 20 is fitted between the inner surface of the mold member 300 and the outer surface of the connection member 70 (connector body 71), and the resin member 120 poured into the mold member 300 is used. A step of pushing the tip into the tip side. By carrying out this process, the resin member 120 is impregnated from the base end face 73 of the connecting member 70 to the outer surface of the needle body 10 and the inner surface of the connecting member 70, so that the needle body 10 and the connecting member 70. A resin layer 90 is formed.

According to the resin filling process of this manufacturing method, by providing the mold member 300, it is not necessary to apply the resin member 120 to the outer surface of the needle body 10, and the resin member 120 can be easily placed around the needle body 10. Can be arranged. Further, by adjusting the axial length of the mold member 300, it is easy to dispose a larger amount of the resin member 120 around the needle body 10 than when the resin member 120 is applied to the outer surface of the needle body 10.
According to the resin layer forming step, the inner tube 20 can be externally fitted to the connection member 70 (connection portion main body 71) using the formwork member 300 as a guide. In addition, the resin member 120 can be filled in the gap between the needle body 10 and the connecting member 70 by pressing the resin member 120 in the distal direction by the pressure of the insertion of the inner tube 20 at the time of external fitting. .
According to this manufacturing method including the resin filling step and the resin layer forming step described above, the resin layer 90 can be easily formed in a slight gap between the outer surface of the needle body 10 and the inner surface of the connection member 70. By forming the resin layer 90, the needle body 10 and the connecting member 70 can be bonded together to manufacture the endoscope injection needle 200 with good water tightness.

  The details of this manufacturing method will be described below by taking the formation of the endoscope injection needle 200 as an example. In addition to the steps performed in the present manufacturing method described above, other steps that may optionally be performed will also be described.

The needle body 10 is inserted into the insertion hole 80 in the connection member 70, and the distal end region of the needle body 10 is projected from the distal end of the connection member 70 by a predetermined length. In such a state, two or more locations are caulked from the outer surface of the connection member 70 to form a fixing portion 94 that joins and fixes the needle body 10 and the connection member 70. By caulking, the insertion hole 80 is tightened inward in the radial direction at the fixing portion 94. A concave portion 96 that is a caulking trace is formed on the outer surface of the connection member 70. Therefore, the distal side and the proximal side of the fixing portion 94 are reduced in diameter relative to the diameter of the proximal end region of the insertion hole 80 to form a reduced diameter region 95.
The insertion hole 80 is previously provided with a tapered portion 150 whose diameter increases from the proximal end to the distal end of the connection member 70. The tapered portion 150 continues from the reduced diameter region 95 on the distal end side with respect to the fixed portion 94, and forms a gap 140.

The formwork member 300 is externally fitted to the connection member 70 so that the base end of the formwork member 300 is located on the base end side of the base end surface 73 of the connection member 70.
Specifically, as shown in FIG. 6, the mold member 300 is fitted on the large diameter portion 72 of the connection member 70. The mold member 300 is a cylindrical body having a cylindrical inner surface and an outer surface, and the diameters of the holes communicating with the interior are substantially uniform. The inner diameter of the mold member is substantially equal to the outer diameter of the connection member 70. In the present embodiment, specifically, the inner diameter of the mold member 300 is substantially equal to the outer diameter of the large-diameter portion 72, and between the inner surface of the mold member 300 and the outer surface of the connection portion main body 71. A significant gap is secured.
In the present embodiment, it is preferable to use a formwork member 300 provided with a vent hole 160 communicating with the inside and the outside in a region facing the connection portion main body 71. For example, the vent hole 160 is preferably formed on the distal end side in a region facing the connection portion main body 71.
The formwork member 300 can be a metal pipe, a tearable tube, or the like.

  A resin filling step of filling the resin member 120 into a region surrounded by the inner surface of the mold member 300, the stepped surface 74, and the outer surface of the connection portion main body 71 is performed. From the viewpoint of reliably forming the resin layer 90 covering the base end surface 73, it is preferable that the resin member 120 is poured from the base end surface 73 of the connection member 70 to the base end side (upper side in FIG. 6) in this step. In the present embodiment, the resin member 120 filled as described above covers the proximal end surface 73 and the filling amount is adjusted so as not to reach the proximal end side opening of the needle body 10.

The manufacturing method may include forming the resin filling portion 110.
That is, in the needle body 10, the space between the outer surface of the proximal extending portion 12 that extends to the proximal side from the proximal end of the connection member 70 and the inner surface of the mold member 300 are filled in advance. Fill like so.
And in the resin layer formation process mentioned later, the resin filling part 110 is formed between the inner surface of the inner tube 20 and the outer surface of the proximal side extension part 12. FIG.
Thereby, the resin layer 90 and the proximal side extension part 12 can be formed in the same process.

After performing the resin filling step as described above, the resin layer forming step is performed.
The inner tube 20 is prepared, and as shown in FIG. 7, the tip of the inner tube 20 is fitted between the inner surface of the mold member 300 and the outer surface of the connecting member 70 (connecting portion main body 71). The thickness of the inner tube 20 is slightly smaller than the gap between the inner surface of the mold member 300 and the outer surface of the connection portion main body 71. The inner tube tube 20 is fitted into the gap, and the resin member 120 is pushed toward the distal end of the connection member 70, and the resin member 120 is inserted into the gap formed between the outer surface of the needle body 10 and the inner surface of the connection member 70. Is impregnated to form the resin layer 90.
Since the distal end surface 75 of the inner tube 20 pushed in the distal direction directly or indirectly contacts the stepped surface 74, the end of the pushing operation can be easily known.

  Further, as shown in FIG. 7, a gap is also provided between the inner surface of the inserted inner tube 20 and the outer surface of the connecting member 70 (connecting portion main body 71), and the resin member 120 is impregnated in the gap. May be. Thereby, the 3rd resin layer 98 which joins the inner tube 20 and the connection member 70 can be formed.

The second resin layer 92 that joins the tip surface 75 and the step surface 74 may be formed by causing the resin member 120 pushed to the tip side of the connection member 70 by the inner tube 20 to reach the step surface 74. .
In this manufacturing method, the second resin layer 92 continuous with the third resin layer 98 is formed. As a modification of the manufacturing method, the formation of the third resin layer 98 may be omitted and only the second resin layer 92 may be manufactured.

  In the present manufacturing method, the vent hole 160 provided in the mold member 300 is preferably provided along the step surface 74 as shown in FIG. When the resin member 120 is pushed in the distal direction by the inner tube 20, the air present on the distal side of the resin member 120 can be released from the vent hole 160, so that the resin member 120 can be easily impregnated to a desired region. .

According to the resin layer forming step described above, the second resin layer 92 or the third resin layer 98 can be formed simultaneously with the resin layer 90.
However, the formation method of the 2nd resin layer 92 and the 3rd resin layer 98 is not limited to this. For example, as a modification of the present embodiment, the second resin layer may be preliminarily coated with the resin member 120 on the stepped surface 74 or the tip surface 75, and then the resin layer forming step may be performed. Alternatively, the distance between the inner surface of the mold member 300 and the outer surface of the connection member 70 (connection portion main body 71) and the thickness of the inner tube tube 20 are substantially reduced to the extent that the third resin layer 98 is not formed. Only the second resin layer 92 may be formed of the same resin member 120 that is pushed into the tip.

After performing the resin layer forming step, the mold member 300 is removed, and the excess resin member 120 is removed as appropriate.
Furthermore, the endoscope injection needle 200 can be manufactured by fitting the outer tube 30 to the inner tube 20.

The first to third embodiments of the present invention have been described above. The present invention is not limited to the above-described embodiment, and includes various modifications and improvements as long as the object of the present invention is achieved. The matters described in each embodiment can be applied to other embodiments as appropriate.
Moreover, the order of description of each process in 3rd embodiment does not limit this manufacturing method. As long as the desired endoscope injection needle can be manufactured, the order of the steps can be appropriately changed. Moreover, you may further add arbitrary processes suitably before or after each process demonstrated, or between one process and another process.
Moreover, although this manufacturing method demonstrated in 3rd embodiment shows the suitable example of the manufacturing method of the injection needle for endoscopes of this invention, what is the manufacturing method of the injection needle for endoscopes of this invention? It is not limited.

The above embodiment includes the following technical idea.
(1) an inner tube for injecting liquid;
A needle provided at the tip of the inner tube,
An insertion hole that penetrates in the axial direction and through which the needle body is inserted is disposed between the inner surface of the inner tube and the outer surface of the needle body, and connects the needle body and the inner tube. A connecting member for,
A resin layer is provided continuously from the base end surface of the connecting member to the outer surface of the needle body and the inner surface of the connecting member to join the needle body and the connecting member. Endoscopic injection needle.
(2) The endoscope according to (1), wherein the resin layer covers the entire outer periphery of the needle body from the base end face of the connection member to at least the vicinity of the insertion hole. Needle.
(3) The connection member has a connection portion main body disposed inside the inner tube, and an outer diameter larger than the inner diameter of the inner tube, and is more distal to the distal end of the inner tube. A large diameter portion to be disposed,
The endoscope injection needle according to (1) or (2), wherein the resin layer is continuous from the base end surface to the inner surface of the large diameter portion.
(4) The second resin layer is provided between the step surface formed by the difference between the outer diameter of the large diameter portion and the outer diameter of the connection portion main body and the tip of the inner tube (3) ) Endoscope injection needle.
(5) having a joint for joining the outer surface of the needle body and the inner surface of the connecting member on the distal side of the resin layer;
A space is formed between the inner surface of the distal end including the distal end of the large diameter portion and the outer surface of the needle body facing the inner surface on the distal side of the joint. The endoscope injection needle according to (3) or (4) above.
(6) The endoscope injection needle according to (5), wherein the distal opening of the insertion hole has a diameter that increases from the proximal side toward the distal side.
(7) The insertion hole in the connection member has a reduced diameter region that reduces the diameter in a predetermined region, and the axially intermediate portion of the reduced diameter region and the outer surface of the needle body abut on each other. A fixing portion for joining and fixing the outer surface of the needle body and the inner surface of the connecting member;
The injection needle for an endoscope according to any one of (1) to (6), wherein the resin layer is continuous over the vicinity of the proximal side of the fixing portion.
(8) The needle body has a proximal side extending portion that extends to a proximal side with respect to a proximal end surface of the connection member,
According to any one of (1) to (7), further comprising a resin filling portion that is continuous from the resin layer and fills a space between the outer surface of the proximal extension portion and the inner surface of the inner tube. Endoscopic needle.
(9) The endoscope injection according to (8), wherein an axial length of the resin filling portion is substantially equal to or longer than an axial length of the connecting member disposed inside the inner tube. needle.
(10) an inner tube for injecting liquid;
A needle provided at the tip of the inner tube,
An insertion hole that penetrates in the axial direction and through which the needle body is inserted is disposed between the inner surface of the inner tube and the outer surface of the needle body, and connects the needle body and the inner tube. An endoscope injection needle for manufacturing an endoscope injection needle having a connection member for
While inserting the said needle body into the said insertion hole, the mold member which is a cylindrical body which has an internal diameter substantially equal to the outer diameter of the said connection member is set to the base end side rather than the base end surface of the said connection member. Fit the connection member so that the proximal end is located,
A resin filling step of pouring the resin member into the mold member so as to embed the base end surface of the connection member and the needle body protruding from the base end surface with the resin member;
After the resin filling step, the distal end of the inner tube is fitted between the inner surface of the mold member and the outer surface of the connecting member, and the resin member poured into the mold member is pushed into the distal end side. Accordingly, the resin member is impregnated between the outer end surface of the needle body and the inner surface of the connection member from the base end surface of the connection member, and the resin that joins the needle body and the connection member And a resin layer forming step of forming a layer.
(11) In the resin filling step, an outer surface of a proximal-side extension portion formed by extending the needle body to a proximal side from a proximal end of the connection member, and an inner surface of the mold member Fill the resin member to fill
The endoscope injection according to (10), wherein the resin layer forming step includes forming a resin filling portion between an inner surface of the inner tube and an outer surface of the proximal extension portion. Needle manufacturing method.

DESCRIPTION OF SYMBOLS 10 ... Needle body 12 ... Proximal side extension part 20 ... Inner tube tube 30 ... Outer tube tube 31 ... Contact part 40 ... Outer cylinder grip 41 ... Guide groove 50 ... Operation part 51 ... Connector 60 ... Inner cylinder grip 61 ... Projection part 70 ... Connection member 71 ... Connection part main body 72 ... Large diameter part 73 ... Base end surface 74: Stepped surface 75 ... Tip surface 80 ... Insertion hole 90 ... Resin layer 92 ... Second resin layer 94 ... Fixed portion 95 ... Reduced diameter region 96 ... Concave portion 97: Joining part 98 ... Third resin layer 100 ... Endoscopic injection needle 110 ... Resin filling part 120 ... Resin member 130 ... Space 140 ... Gap 150 ... Tapered portion 160 ... vent 200 ... endoscope injection needle 300 ... mold member x ... dimensions

Claims (9)

An inner tube for injecting liquid;
A needle provided at the tip of the inner tube,
An insertion hole that penetrates in the axial direction and through which the needle body is inserted is disposed between the inner surface of the inner tube and the outer surface of the needle body, and connects the needle body and the inner tube. A connecting member for,
A resin layer is provided for joining the needle body and the connection member continuously from the base end surface of the connection member to the outer surface of the needle body and the inner surface of the connection member.
The endoscope injection needle, wherein the distal opening of the insertion hole has a diameter increasing from the proximal side toward the distal side. The injection needle for endoscope according to claim 1, wherein the resin layer covers the entire outer periphery of the needle body from the base end surface of the connection member to at least the vicinity of the proximal side of the insertion hole. The connecting member has a connecting portion main body disposed inside the inner tube and an outer diameter larger than the inner diameter of the inner tube, and is disposed on the distal side of the distal end of the inner tube. A large diameter portion, and
The endoscope injection needle according to claim 1 or 2 , wherein the resin layer is continuous from the base end surface to the inner surface of the large-diameter portion. 4. The second resin layer according to claim 3 , wherein a second resin layer is provided between a step surface formed by a difference between an outer diameter of the large-diameter portion and an outer diameter of the connection portion main body and a tip of the inner tube. Endoscopic needle. Having a joint for joining the outer surface of the needle body and the inner surface of the connection member on the distal side of the resin layer;
A space is formed between the inner surface of the distal end including the distal end of the large diameter portion and the outer surface of the needle body facing the inner surface on the distal side of the joint. The endoscope needle for endoscope according to claim 3 or 4 . The insertion hole in the connection member has a reduced diameter region that is reduced in diameter in a predetermined region, and an axially intermediate portion of the reduced diameter region and an outer surface of the needle body come into contact with each other. Having a fixing part for joining and fixing the outer surface and the inner surface of the connecting member;
The injection needle for an endoscope according to any one of claims 1 to 5 , wherein the resin layer is continuous over the vicinity of the proximal side of the fixing portion. The needle body has a proximal side extending portion that extends to a proximal side with respect to a proximal end surface of the connection member,
The endoscope according to any one of claims 1 to 6, further comprising a resin filling portion that is continuous from the resin layer and fills a space between an outer surface of the proximal extension portion and an inner surface of the inner tube. Needle. An inner tube for injecting liquid;
A needle provided at the tip of the inner tube,
An insertion hole that penetrates in the axial direction and through which the needle body is inserted is disposed between the inner surface of the inner tube and the outer surface of the needle body, and connects the needle body and the inner tube. An endoscope injection needle for manufacturing an endoscope injection needle having a connection member for
While inserting the said needle body into the said insertion hole, the mold member which is a cylindrical body which has an internal diameter substantially equal to the outer diameter of the said connection member is set to the base end side rather than the base end surface of the said connection member. Fit the connection member so that the proximal end is located,
A resin filling step of pouring the resin member into the mold member so as to embed the base end surface of the connection member and the needle body protruding from the base end surface with the resin member;
After the resin filling step, the distal end of the inner tube is fitted between the inner surface of the mold member and the outer surface of the connecting member, and the resin member poured into the mold member is pushed into the distal end side. Accordingly, the resin member is impregnated between the outer end surface of the needle body and the inner surface of the connection member from the base end surface of the connection member, and the resin that joins the needle body and the connection member And a resin layer forming step of forming a layer. A method of manufacturing an endoscope injection needle, comprising: In the resin filling step, the space between the outer surface of the proximally extending portion formed by extending the needle body to the proximal side of the base end of the connecting member and the inner surface of the mold member are filled. Filling the resin member so that
The endoscope injection needle according to claim 8 , wherein the resin layer forming step includes forming a resin filling portion between an inner surface of the inner tube and an outer surface of the proximal extension portion. Manufacturing method.

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