JP2015116242A - Injection needle for endoscope and manufacturing process of injection needle for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection needle for endoscopes and manufacturing process of the injection needle for endoscopes, when defining the length from an extraction/retraction section to a puncture needle to a desired size, capable of reducing press-in workload.SOLUTION: The injection needle for endoscopes includes: an extraction/retraction section (an inner tube grip 60) for operating to extract/retract the puncture needle outside/inside an outer tube 30; an inner tube 20 having the puncture needle and slidably inserted in the outer tube 30; a connecting tube 62 pressed in the inner tube 20 for connecting the extraction/retraction section (the inner cylinder grip 60) to the inner tube 20; and a spacer tube 70 fitted to the periphery of the connecting tube 62, and having one end face 75 coming into contact with the extraction/retraction section (the inner cylinder grip 60) and the other end face 76 coming into contact with an end face 21 of the inner tube 20.

Description

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

To remove the mucous membrane and muscle layer during endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) to remove the mucosa of the esophagus, stomach, and large intestine under the endoscope An endoscopic injection needle having an inner tube with a puncture needle attached to the tip, an outer tube that allows the inner tube to be inserted, and an advancing / retreating portion for performing the advancing / retreating operation of the puncture needle is inserted into the affected area. Injecting a saline solution or a chemical solution is usually performed.
Examples of this type of endoscope injection needle include Patent Document 1 and Patent Document 2 below.

Patent Document 1 describes an endoscopic high-frequency treatment instrument that can continuously perform a mucosal bulging treatment and a peeling treatment by using a puncture needle of an endoscope injection needle as a high-frequency electrode.
Patent Document 2 describes an endoscope injection needle having a structure for preventing a puncture needle from excessively protruding.

  In general, an endoscope injection needle has a connector to which a syringe can be attached at an advancing / retreating portion, and has a structure including a tubular body communicating from the connector to an inner tube. In some endoscope injection needles, the tubular body protrudes to form a connecting tube, and the inner tube is joined to the connecting tube. Here, the connecting pipe is, for example, a “tube base pipe” illustrated in FIG. 2 or the like in Patent Document 1 and a “pipe” illustrated in FIG. 1 in Patent Document 2.

When the inner tube and the connecting pipe are joined as described above, the inner tube is often press-fitted and fixed to the connecting pipe. This is because the press-fitting can be fixed without using a substance other than the member to be joined, and is less troublesome than other fixing methods. For example, in a fixing method using a fastener, there is an inconvenience of selecting a fastener in consideration of a size and shape that do not impede sliding of the inner tube in the outer tube. In addition, in the fixing method using an adhesive, there is an inconvenience of selecting the adhesive in consideration of the possibility that the solvent of the adhesive dissolves into the circulating chemical solution.

JP 2006-115966 A Japanese Utility Model Publication No. 6-81544

When manufacturing an endoscope injection needle, it is necessary to manufacture and manage the distance from the advancing / retreating portion to the puncture needle attached to the distal end of the inner tube in order to maintain the accuracy of the dimension that the puncture needle protrudes from the outer tube. .
Since the press-fitting length of the connecting tube with respect to the inner tube affects the distance from the advancing / retreating portion to the puncture needle, the press-fitting length of the inner tube is preferably set to a desired dimension. However, if the press-fitting ends at a midway position of the connecting pipe, it is difficult to adjust the press-fitting length, and there are cases where the press-fitting length of the inner tube is excessive or insufficient.
Further, in the press-fitting work, the inner tube is press-fitted to the connecting pipe by applying pressure, but the work load is not small.

  The present invention has been made in view of the above-described problems. An endoscope needle and an endoscope that can reduce the load of press-fitting work when the length from the advance / retreat portion to the puncture needle is set to a desired dimension. A method for manufacturing a mirror injection needle is provided.

  According to the present invention, the advancing / retreating part for advancing / retreating the puncture needle inside / outside the outer tube, the inner tube having the puncture needle and slidably inserted into the outer tube, and the inner tube A connection tube that is press-fitted to connect the advance / retreat portion and the inner tube, and is mounted around the connection tube, and one end surface is in contact with the advance / retreat portion, and the other end surface is in contact with the end surface of the inner tube. And an endoscope injection needle comprising:

  Further, according to the present invention, the advancing / retreating part for advancing and retracting the puncture needle inside and outside the outer tube, the inner tube having the puncture needle and slidably inserted in the outer tube, and the advance / retreat And a connecting pipe for connecting the inner tube to the inner tube, a method for manufacturing an endoscope injection needle, a mounting step of mounting a spacer tube around the connecting pipe, and the connecting pipe to the inner tube And a press-fitting step for press-fitting until one end surface of the spacer tube is in contact with the advancing / retreating portion and the other end surface is in contact with the end surface of the inner tube.

  According to the above invention, the press-fit length can be set to a desired dimension relatively easily by pressing the inner tube until it comes into contact with the end surface of the spacer tube as a reference. In addition, since the spacer tube becomes a pawl, excessive press-fitting can be prevented and the load of press-fitting work can be reduced.

  According to the present invention, when the length from the advancing / retreating portion to the puncture needle is set to a desired dimension, it is possible to reduce the load of press-fitting work.

It is a whole figure of the injection needle for endoscopes in the state where the puncture needle was stored. It is a whole figure of the injection needle for endoscopes in the state where the puncture needle protruded. It is a cross-sectional schematic diagram of the injection needle for endoscopes. It is a perspective view of a spacer tube. It is a flowchart of the manufacturing method of the injection needle for endoscopes.

  Hereinafter, embodiments 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 description thereof will be omitted as appropriate. Unless otherwise specified in the text, the “proximal end” is the proximal end of the endoscope injection needle 100, the right side of FIGS. 1 to 3, and the “distal end” is for the endoscope. It is the front end side of the injection needle 100, and the left side of FIGS.

<Configuration of Endoscopic Injection Needle 100>
First, the configuration of the endoscope injection needle 100 of the present embodiment will be described.
FIG. 1 is an overall view of an endoscope injection needle 100 in a state in which a puncture needle 10 is housed.
FIG. 2 is an overall view of the endoscope injection needle 100 with the puncture needle 10 protruding.
FIG. 3 is a schematic cross-sectional view of the endoscope injection needle 100 cut along the axial direction in the vicinity of the spacer tube 70. FIG. 3 shows a state where the puncture needle 10 protrudes. FIG. 3 is a schematic diagram, and the present invention is not limited to the dimensions and aspect ratios shown here.

The endoscope injection needle 100 includes a puncture needle 10, an inner tube 20, an outer tube 30, an inner cylinder grip 60 (advance / retreat part), and a connecting tube 62.
The inner cylinder grip 60 moves the puncture needle 10 in and out of the outer tube 30. The inner tube 20 has a puncture needle 10 and is slidably inserted into the outer tube 30. The connection pipe 62 is press-fitted into the inner tube 20 to connect the inner cylinder grip 60 and the inner tube 20. The spacer tube 70 is mounted around the connection pipe 62, and one end surface 75 is in contact with the inner cylinder grip 60 and the other end surface 76 is in contact with the end surface 21 of the inner tube 20.

Here, when the puncture needle 10 is advanced or retracted inside or outside the outer tube 30, the state in which at least a part of the puncture needle 10 protrudes from an opening provided somewhere in the outer tube 30 (protruding state), In other words, the puncture needle 10 is shifted from one of the protruding states (stored state) to the other.
In the present embodiment, the opening is provided at the tip of the outer tube 30, but this is an example, and an opening may be provided at another position.

  As shown in FIG. 1, in the present embodiment, a certain distance is provided from the distal end of the outer tube 30 to the distal end of the puncture needle 10 in a state where the puncture needle 10 is housed in the outer tube 30. This is to prevent the puncture needle 10 from unexpectedly protruding due to the outer tube 30 being bent or the like.

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

  The material of the inner tube 20 is 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) can be used.

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 a chemical solution or the like injected from a syringe (not shown) connected to the connector 51. When the operator operates the operation unit 50, the puncture needle 10 can be inserted into the affected area of the subject. In addition, an opening (not shown) is provided at the tip of the puncture needle 10, and an operator can inject a drug solution or the like into the affected part by operating a syringe (not shown).

A part of the proximal end side of the outer tube 30 is joined to the inner surface of the outer cylinder grip 40.
In the present embodiment, the inner surface of the outer cylinder grip 40 and the outer surface of the outer tube 30 are illustrated as being joined. However, the outer surface of the outer cylinder grip 40 and the inner surface of the outer tube 30 may be bonded together. Absent. 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.

  The material of the outer tube 30 is not particularly limited, but 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, a polyolefin resin, a polyamide resin (nylon resin), a polyurethane resin, or the like can be used. Moreover, you may use the above-mentioned fluororesin.

The connection pipe 62 is a member that is press-fitted into the inner tube 20 and connects the inner cylinder grip 60 and the inner tube 20.
Here, press-fitting refers to insertion into the inner tube 20 with a pressing force larger than the weight of the connection pipe 62. In addition, connecting here means that the inner cylinder grip 60 and the connecting pipe 62, the connecting pipe 62 and the inner tube 20 are joined to each other, and the respective internal spaces communicate with each other to become a flow path for a chemical solution or the like. Say.

The connection pipe 62 of the present embodiment is fitted so that a part of the base end side abuts against the bottom surface 66 of the recess 65 of the inner cylinder grip 60 and is joined to the inner cylinder grip 60. Further, the connecting pipe 62 protrudes from the one surface 63 of the inner cylinder grip 60 at a part on the tip side. The connecting pipe 62 is press-fitted into the inner tube 20 at a portion protruding from the inner cylinder grip 60, and connects the inner cylinder grip 60 and the inner tube 20.
For joining the connecting pipe 62 and the inner cylinder grip 60, a fastener (not shown) may be used, or an adhesive may be used. In the present embodiment, the inner cylinder grip 60 and the connecting pipe 62 are described as separate members, but may be integrated members.

The length in the longitudinal direction (the length from one surface 63 of the inner cylinder grip 60 to the bottom surface 66 of the recess 65) at the joining surface of the inner cylinder grip 60 and the connecting pipe 62 is at least twice the outer diameter of the connecting pipe 62. can do. This is because the connecting pipe 62 is stably fixed.
The press-fitting length of the connecting pipe 62 with respect to the inner tube 20 can be made twice or more the outer diameter of the connecting pipe 62. This is because the inner tube 20 and the connecting pipe 62 are stably fixed, the inner tube 20 is prevented from being bent in the vicinity of the connecting pipe 62, and the forward / backward operation is smoothly performed.

The deformation resistance of the connecting pipe 62 is preferably greater than the deformation resistance of the inner tube 20.
This is to prevent bending deformation of the connecting pipe 62 due to the inner tube pressure. Further, this is to prevent the diameter of the connecting pipe 62 from being reduced due to the pressure mounting of the inner tube 20.
Here, the deformation resistance includes bending rigidity when the connecting pipe 62 is cut out to a unit length and radial rigidity of the connecting pipe 62.
In the present embodiment, the connecting pipe 62 can be made of stainless steel (SUS).

  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.

As described above, in the present embodiment, the outer cylinder grip 40 and the outer tube 30 are connected, and the inner cylinder grip 60, the connection pipe 62, the inner tube 20, and the puncture needle 10 are connected. Therefore, the operator of the endoscope injection needle 100 can advance and retract the puncture needle 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 stab needle 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 puncture needle 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, and other forms may be used.
For example, the operation unit 50 can slide (advance and retract) the inner cylinder grip 60 and the outer cylinder grip 40 only in the axial direction, and fix the protrusion 61 to at least one of the proximal end side and the distal end side of the guide groove 41. The structure which has the site | part may be sufficient. This eliminates the need for sliding in the rotation direction, and therefore, the torsional load generated between the inner tube 20 and the connecting pipe 62 or between the connecting pipe 62 and the inner cylinder grip 60 is reduced, and the respective joints are more stable. Can be fixed.

The spacer tube 70 is attached around the connection pipe 62.
Here, being attached to the periphery means that the connecting tube 62 is inserted into the spacer tube 70 so that the spacer tube 70 covers a part or all of the connecting tube 62. The mounting may be press-fitting or loose insertion.

However, in a state where the spacer tube 70 is mounted around the connection tube 62, the bonding force between the connection tube 62 and the spacer tube 70 is smaller than the bonding force between the connection tube 62 and the inner tube 20. More desirable.
This is because the spacer tube 70 only needs to be substantially fixed in position by being sandwiched between the inner tube 20 and the inner cylinder grip 60, and does not necessarily have to be joined to the connection pipe 62. On the other hand, it is preferable that the inner tube 20 be appropriately fixed because the protrusion or storage operation of the puncture needle 10 may become impossible if the press-fitting length varies.
Here, the joining force is difficulty in separating the plurality of members, and specifically, it can be measured as a tensile load when a tensile test is performed in a state where the respective members are bonded.

The inner diameter of the spacer tube 70 is preferably smaller than the outer diameter of the inner tube 20.
This is because if the gap between the connecting pipe 62 and the spacer tube 70 is excessive, the inner tube 20 enters the gap, and the spacer tube 70 may not function sufficiently as a pawl when the inner tube 20 is press-fitted. Because. Moreover, it is because it may become an obstructive factor for the advance / retreat operation of the puncture needle 10 (sliding in the axial direction of the outer cylinder grip 40 and the inner cylinder grip 60).

In addition, with respect to the spacer tube 70, the end surface 75 on the proximal end side contacts the one surface 63 of the inner cylinder grip 60, and the end surface 76 on the distal end side contacts the end surface 21 of the inner tube 20. Both ends of the spacer tube 70 abut on the inner cylinder grip 60 and the inner tube 20 to prevent the inner tube 20 from moving to the proximal end side due to the frictional resistance of the outer tube 30 and the inner tube 20 during the advance / retreat operation. The relative positional relationship between the outer tube 30 and the inner tube 20 can be maintained.
In the present embodiment, the spacer tube 70 and the inner cylinder grip 60 and the spacer tube 70 and the inner tube 20 are in contact with each other. However, the present invention is allowed with dimensional accuracy from the inner cylinder grip 60 to the puncture needle 10. It does not exclude the minute gaps below the forming error. For example, a minute gap caused by temperature deformation of each component or a minute gap less than the dimensional accuracy may be allowed.
In the present embodiment, the one surface 63 of the inner cylinder grip 60 is illustrated as an end surface on the distal end side of the inner cylinder grip 60, but the present invention is not limited thereto. That is, the surface with which the end face 75 on the proximal end side of the spacer tube 70 of the present invention is in contact may be in the vicinity of the portion where the connecting pipe 62 and the inner cylinder grip 60 are joined, and the position is not necessarily the end face. . For example, if the inner tube grip 60 has a recess on the distal end side and the connection pipe 62 protrudes from the bottom surface, the base end side end surface 75 of the spacer tube 70 may be in contact with the bottom surface. I do not care.

In the present embodiment, the length in the longitudinal direction of the spacer tube 70 can be configured to be larger than the press-fitting length of the inner tube 20.
Since the press-fitting length of the inner tube 20 is reduced as the length of the spacer tube 70 is increased, the work load of the press-fitting work can be reduced. It is preferable to reduce the press-fitting length to such an extent that the press-fitting and fixing of the inner tube 20 is not hindered.

The compression rigidity of the spacer tube 70 of this embodiment can be made higher than the compression rigidity of the inner tube 20.
Since the spacer tube 70 is provided as a pawl when the inner tube 20 is press-fitted, it is desirable that the spacer tube 70 has higher deformation resistance than the inner tube 20.
Here, the compression rigidity is the difficulty of compressive deformation in the longitudinal direction of the spacer tube 70 or the axial direction of the inner tube 20, and more specifically, the spacer tube 70 or the inner tube 20 is cut out in a unit length. It can be measured as a compression load when a compression test is performed.

FIG. 4 is a perspective view of the spacer tube 70.
The spacer tube 70 is provided with one or a plurality of fragile portions 71 to 74.
In the present embodiment, three weak portions 71 to 73 are provided at intervals from the end portion (end surface 75 or end surface 76) of the spacer tube 70, and the weak portion 74 is formed in parallel to the axial direction of the spacer tube 70 from the end portion. The fragile portions 71 to 73 and the fragile portion 74 intersect at right angles.

  In this embodiment, the fragile portions 71 to 74 are half-cut grooves that are cut and molded to a partial depth of the thickness of the spacer tube 70. It may replace with this and the structure which provided the weak parts 71-74 by the perforation in the spacer tube 70 may be sufficient.

  By attaching the spacer tube 70 processed in this way to the connection pipe 62, the spacer tube 70 can be easily separated at any location of the fragile portions 71 to 74 even after the attachment. Can be prepared.

The positions and number of the weak parts 71 to 74 described here are merely examples, and may be changed as appropriate. However, as described above, it is desirable that the spacer tube 70 has a certain rigidity, and it is more preferable to provide the weakened portions 71 to 74 only in a partial region from the tip of the spacer tube 70 as in the present embodiment.
Moreover, although the shape of the spacer tube 70 of this embodiment was illustrated as a cylinder, this is an example and may be changed as appropriate.

The structure of the endoscope injection needle 100 has been described so far, but this embodiment is an example. The various components of the present invention do not need to be individually independent, that a plurality of components are formed as one member, that one component is formed of 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.

<Method for Manufacturing Endoscopic Injection Needle 100>
FIG. 5 is a flowchart showing a method for manufacturing the endoscope injection needle 100.
First, the spacer tube 70 is attached around the connection pipe 62 (attachment step, step S1). Next, the connecting pipe 62 is press-fitted into the inner tube 20 until one end surface 75 of the spacer tube 70 is in contact with the operation unit 50 and the other end surface 76 is in contact with the end surface 21 of the inner tube 20 (press-in process, step S2). .
In this embodiment, step S2 is performed after step S1, but this may be changed. For example, when the spacer tube 70 has a slit on its side surface, the cross section is C-shaped, and has a certain flexibility, the spacer tube 70 is connected to the connecting tube 62 from the slit in the middle of step S2. It is possible to carry out the step S1 by mounting it so as to push it into.

It is desirable that the frictional force acting between the connection pipe 62 and the spacer tube 70 in step S1 is smaller than the frictional force acting between the connection pipe 62 and the inner tube 20 in step S2. This is for facilitating the mounting of the spacer tube 70 and reducing the burden on the connection pipe 62.
The frictional force mentioned here means a frictional load generated between the members when the spacer tube 70 is attached to the connecting pipe 62 or when the inner tube 20 is press-fitted into the connecting pipe 62, and is different from the above-described joining force.

In the present embodiment, a step of measuring a dimension indicating the length from the inner cylinder grip 60 to the puncture needle 10 (measurement step, step S3), and the length of the spacer tube 70 based on the dimension measured in step S3. (Preparation step, step S5).
More specifically, step S3 is performed after step S2, and it is determined whether or not the length of the spacer tube 70 needs to be adjusted based on the dimension measured in step S3 (determination step, step S4). If it is determined in step S4 that preparation is required (if step S4 is Yes), step S5 is performed. After step S5, the connecting tube 62 is press-fitted into the inner tube 20 until one end surface 75 of the spacer tube 70 contacts the inner cylinder grip 60 and the other end surface 76 contacts the end surface 21 of the inner tube 20 (re-pressing step, Step S6).
If it is determined in step S4 that preparation is not required (if step S4 is No), that is, if the length of the spacer tube 70 attached in step S1 is appropriate, steps S5 and S6 are performed. It does not have to be.

Here, the dimension indicating the length from the inner cylinder grip 60 to the puncture needle 10 may be a value obtained by directly measuring the length from the inner cylinder grip 60 to the puncture needle 10, or the measured dimension was used. The value from which the length from the inner cylinder grip 60 to the puncture needle 10 can be known by calculation may be sufficient.
The dimension measured in step S <b> 3 of the present embodiment is the length from one surface 63 of the inner cylinder grip 60 to the tip of the puncture needle 10. In step S4, the determination is made by comparing the dimension measured in step S3 with the desired dimension from one surface 63 of the inner cylinder grip 60 to the tip of the puncture needle 10. As a result of the comparison, if the dimension measured in step S3 and the desired dimension fall within the allowable error, it is determined as Yes, and if not, it is determined as No.

This is because the measurement position in step S3 and the determination criterion in step S4 of the present embodiment are based on the premise that the length from one surface 63 of the inner cylinder grip 60 to the tip of the puncture needle 10 is manufactured and managed. In the manufacturing method of the present invention, the measurement position in step S3 and the determination criterion in step S4 may be suitably changed in accordance with manufacturing specifications, manufacturing management standards, and the like.
For example, in the measurement process, the length of the spacer tube 70 in the longitudinal direction and the length from the end surface 21 of the inner tube 20 to the tip of the puncture needle 10 may be measured. By adding these two together, the length from the inner cylinder grip 60 to the puncture needle 10 can be known. With this measurement method, measurement is possible even before the spacer tube 70 is attached to the connection pipe 62.
Further, step S3 may be performed before the puncture needle is attached. In this case, the length from one surface 63 of the inner cylinder grip 60 to the tip of the inner tube 20 can be manufactured and managed.

In step S <b> 5, the spacer tube 70 can be prepared by cutting it off at any one or a plurality of weakened portions 71 to 74 provided on the spacer tube 70.
More specifically, the length of the spacer tube 70 to be shortened is determined by obtaining a difference between the length measured in step S3 and a desired dimension from one surface 63 of the inner cylinder grip 60 to the tip of the puncture needle 10. be able to. Then, the spacer tube 70 can be cut and prepared at a position corresponding to the determined shortened length (any one of the fragile portions 71 to 74).
By doing so, it is possible to adjust the inner tube 20, the spacer tube 70, and the connecting pipe 62 appropriately according to variations in length.

In step S <b> 6, the spacer tube 70 is press-fitted into the connecting pipe 62 until the end surface 75 contacts the one surface 63 of the inner cylinder grip 60 and the end surface 76 contacts the end surface 21 of the inner tube 20.
Here, the description is made until the contact is made, but a minute gap may be allowed as described above.

  The endoscope injection needle 100 of this embodiment can be manufactured by the manufacturing method including the steps S1 to S6. Of course, when the endoscope injection needle 100 is manufactured, other steps related to the components such as the outer cylinder grip 40 and the outer tube 30 are also necessary, but the description here is omitted.

The manufacturing method of this embodiment is an example, and the manufacturing method of the present invention is not limited to this.
For example, the measurement process and the preparation process can be performed before the mounting process and the press-fitting process. In this case, in the measurement step, the length from the end surface 21 of the inner tube 20 to the tip of the puncture needle 10 may be measured. In the preparation process, the length of the spacer tube 70 is determined based on the difference between the desired dimension from the one surface 63 of the inner cylinder grip 60 to the tip of the puncture needle 10 and the dimension measured in the measurement process. An appropriate one may be selected from the spacer tubes 70 prepared in advance. In the case of this example, the endoscope injection needle 100 can be manufactured without including the above-described determination process and re-pressing process.
Alternatively, the spacer tube 70 may be detached from the connection pipe 62 in the adjustment step, and the spacer tube 70 may be cut to a desired size.

  In addition, the manufacturing method of the present invention is not limited to the above-described example, and the manufacturing method of the present invention allows changes such as changing the order of the above-described steps, adding other steps, and paralleling a plurality of steps.

This embodiment includes the following technical ideas.
(1) An advancing / retreating part for advancing / retracting a puncture needle inside / outside of the outer tube, an inner tube having the puncture needle and slidably inserted into the outer tube, and press-fitted into the inner tube, A connecting pipe connecting the advance / retreat portion and the inner tube, and a spacer tube mounted around the connection pipe, one end surface of which is in contact with the advance / retreat portion, and the other end surface of which is in contact with the end surface of the inner tube, An endoscope injection needle provided.
(2) The endoscope injection needle according to (1), wherein a bonding force between the connection tube and the spacer tube is smaller than a bonding force between the connection tube and the inner tube.
(3) The endoscope injection needle according to (1) or (2), wherein an inner diameter of the spacer tube is smaller than an outer diameter of the inner tube.
(4) The endoscope needle according to any one of (1) to (3), wherein a length of the spacer tube in a longitudinal direction is larger than a press-fitting length of the inner tube.
(5) The endoscope injection needle according to any one of (1) to (4), wherein the compression rigidity of the spacer tube is higher than the compression rigidity of the inner tube.
(6) The endoscope injection needle according to any one of (1) to (5), wherein one or more fragile portions are provided in the spacer tube.
(7) An advancing / retreating part for advancing / retreating the puncture needle inside / outside of the outer tube, an inner tube having the puncture needle and slidably inserted into the outer tube, the advance / retreat part, and the inner tube A connecting tube that connects the connecting tube, the mounting step of mounting a spacer tube around the connecting tube, the connecting tube to the inner tube, and the spacer tube A press-fitting step of press-fitting until one end surface is in contact with the advancing and retracting portion and the other end surface is in contact with the end surface of the inner tube.
(8) The frictional force acting between the connection tube and the spacer tube in the mounting step is smaller than the frictional force acting between the connection tube and the inner tube in the press-fitting step. Of producing an endoscope injection needle.
(9) a measurement step of measuring a dimension indicating the length from the advance / retreat portion to the puncture needle, and a preparation step of adjusting the length of the spacer tube based on the dimension measured in the measurement step. The manufacturing method of the injection needle for endoscopes as described in (7) or (8).
(10) The method for manufacturing an endoscope injection needle according to (9), wherein in the preparation step, the spacer tube is cut off at one or a plurality of fragile portions provided on the spacer tube. .
(11) After the mounting step, the press-fitting step is performed, and after the press-fitting step, the measurement step and the preparation step are performed, and after the preparation step, one end face of the spacer tube is in contact with the advance / retreat portion. The method for manufacturing an endoscope injection needle according to (9) or (10), wherein a re-pressing step of press-fitting the connection pipe into the inner tube is performed until the other end surface contacts the end surface of the inner tube.

DESCRIPTION OF SYMBOLS 100 Endoscope injection needle 10 Puncture needle 20 Inner tube 21 End surface of inner tube 30 Outer tube 40 Outer cylinder grip 41 Guide groove 50 Operation part 51 Connector 60 Inner cylinder grip 61 Projection part 62 Connection pipe 63 One side of inner cylinder grip 65 Inner cylinder grip recess 66 Bottom of recess 70 Spacer tube 71-74 Fragile portion 75, 76 End face of spacer tube

Claims (11)

An advancing / retreating part for advancing / retreating the puncture needle into / outside of the outer tube;
An inner tube having the puncture needle and slidably inserted into the outer tube;
A connection pipe that is press-fitted into the inner tube and connects the advancement and retraction part and the inner tube;
An endoscope injection needle comprising: a spacer tube that is mounted around the connection tube and has one end surface in contact with the advancing / retreating portion and the other end surface in contact with the end surface of the inner tube.   The injection needle for an endoscope according to claim 1, wherein a bonding force between the connection tube and the spacer tube is smaller than a bonding force between the connection tube and the inner tube.   The injection needle for endoscope according to claim 1 or 2, wherein an inner diameter of the spacer tube is smaller than an outer diameter of the inner tube.   The endoscope needle according to any one of claims 1 to 3, wherein a length of the spacer tube in a longitudinal direction is larger than a press-fitting length of the inner tube.   The injection needle for endoscopes according to any one of claims 1 to 4, wherein the compression rigidity of the spacer tube is higher than the compression rigidity of the inner tube.   The injection needle for an endoscope according to any one of claims 1 to 5, wherein one or more fragile portions are provided in the spacer tube. An advancing / retreating part for advancing / retreating the puncture needle into / outside of the outer tube;
An inner tube having the puncture needle and slidably inserted into the outer tube;
A connecting pipe connecting the advance / retreat portion and the inner tube; and a manufacturing method of an endoscope injection needle comprising:
A mounting step of mounting a spacer tube around the connecting pipe;
A press-fitting step in which the connecting tube is inserted into the inner tube, one end surface of the spacer tube is in contact with the advancing / retreating portion, and the other end surface is in contact with the end surface of the inner tube. Production method.   8. The internal view according to claim 7, wherein a frictional force acting between the connection tube and the spacer tube in the mounting step is smaller than a frictional force acting between the connection tube and the inner tube in the press-fitting step. A method for manufacturing a mirror injection needle. A measurement step of measuring a dimension indicating a length from the advance / retreat portion to the puncture needle;
The manufacturing method of the injection needle for endoscopes of Claim 7 or 8 including the preparation process which adjusts the length of the said spacer tube based on the dimension measured at the said measurement process.   The method for manufacturing an endoscope injection needle according to claim 9, wherein in the preparation step, the spacer tube is prepared by cutting off at one or a plurality of fragile portions provided on the spacer tube. After the mounting step, perform the press-fitting step,
After the press-fitting step, perform the measurement step and the preparation step,
10. The re-pressing step of press-fitting the connecting pipe into the inner tube until one end surface of the spacer tube is in contact with the advancing / retreating portion and the other end surface is in contact with the end surface of the inner tube after the preparing step. Or a method for producing an endoscope injection needle according to 10.

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