JP6311479B2 - 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 that allows the inner tube to be inserted is inserted, and physiological saline or a drug solution is inserted into the living tissue. Etc. (hereinafter, also simply referred to as liquid) is generally practiced.
An 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 a needle body in a predetermined living tissue. 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 peripheral surface of the needle body and the inner peripheral surface of the inner tube. An endoscope injection needle provided with a connection member for filling the gap and connecting the needle body and 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, the gap between the needle body and the inner tube is filled and both are connected.
Patent Document 1 As shown in FIG. 4, the end face on the base end side of the coil-shaped member intersects substantially perpendicularly to the axial direction of the inner tube.

JP 2009-172029 A

  However, an endoscope injection needle having a connecting member that fills a gap between the needle body and the inner tube injection needle exemplified in the prior art 1 and connects the needle body and the inner tube tube is as follows. Had problems.

That is, when the liquid flowing from the proximal end side to the distal end side in the inner tube tube with a strong discharge pressure comes into contact with the proximal end surface of the connecting member, the connecting member is pressed toward the distal end side. As a result, the connection state between the outer peripheral surface of the connection member and the inner peripheral surface of the inner tube is poor, and the arrangement position of the connection member in the inner tube may be shifted to the tip side of the inner tube. Since the placement position of the needle inserted through the connection member is also displaced due to the displacement of the connection member placement position, the actual needle body tip position is changed to the tip side from the needle tip position planned in the design, and the procedure in the body is performed. There was a risk of causing trouble.
In addition, when the arrangement position of the connecting member is largely displaced toward the distal end side, the connecting member and the needle inserted through the connecting member may fall off from the distal end side of the inner tube.

  The present invention has been made in view of the above problems. That is, the present invention has the above-described problem that the arrangement position of the connecting member arranged in the inner tube and the needle body inserted through the connecting member arranged in the inner tube by the discharge pressure of the liquid flowing through the inner tube deviates to the tip side of the inner tube. Provided are an improved endoscope injection needle and 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 a tip of the inner tube, and a needle penetrating in the direction of the central axis of the inner tube. A connecting member for connecting the needle body and the inner tube, which is disposed between the inner peripheral surface of the inner tube and the outer peripheral surface of the needle body, A resin filling portion formed by filling a resin member between the outer peripheral surface of the needle body protruding from the base end surface of the connecting member to the base end side, the inner peripheral surface of the inner tube, and the base end surface of the connecting member. And a cross-sectional surface with respect to the inner peripheral surface of the inner tube, including the most proximal point of the peripheral edge of the base end surface of the resin-filled portion and the most distal point of the peripheral edge and intersecting the central axis The first normal that is the normal line of the first imaginary plane that is the cut surface that minimizes the intersection angle between the line and the central axis Line, and being inclined with respect to the central axis.

  The method for manufacturing an endoscope injection needle according to the present invention is a method for manufacturing an endoscope injection needle for manufacturing the endoscope injection needle according to the present invention, wherein the connection member is inserted into the insertion hole in the connection member. An insertion step of inserting the needle body so as to protrude from the distal end side and the proximal end side of the outer periphery, and an external fitting of a mold member having an inner diameter substantially equal to the outer diameter of the connection member on the proximal end side of the connection member The resin member is injected into the mold member in contact with the fitting step, the inner peripheral surface of the mold member, the outer peripheral surface of the needle body, and the proximal end surface of the connecting member, and the above-mentioned relative to the proximal end direction A resin filling portion forming step for forming the resin filling portion so that a base end surface of the resin filling portion is inclined, and an inner tube mounting for providing the inner tube so as to enclose at least a part of the connecting member and the resin filling portion. And a process.

The endoscope injection needle of the present invention is a cutting surface with respect to the inner peripheral surface of the inner tube, and includes the most proximal point of the peripheral edge of the proximal end surface of the resin-filled portion and the most distal point of the peripheral edge and intersects the central axis At the same time, the first normal line, which is the normal line of the first imaginary plane, which is the cut surface with the smallest intersection angle between the normal line and the central axis, is inclined with respect to the central axis. Therefore, the direction in which the discharge pressure of the liquid flowing through the inner tube is applied to the resin filling portion can be shifted from the axial direction of the inner tube.
If the liquid discharge pressure is applied in the axial direction to the boundary between the outer peripheral surface of the resin-filled portion and the inner peripheral surface of the inner tube, they may be separated and the bonding state may be poor. In contrast, in the endoscope injection needle of the present invention, the first virtual plane intersects the central axis at an angle exceeding 90 °, and the local force of the liquid discharge pressure is applied to the boundary. It is configured to be easily displaced in the lateral direction with respect to the axial direction.
Therefore, the arrangement position of the connecting member and the needle inserted through the connecting member is not easily shifted to the distal end side in the axial direction of the inner tube.

  The method for manufacturing an endoscope injection needle according to the present invention enables the manufacture of an endoscope injection needle according to the present invention.

(A) is the whole endoscope needle which illustrates the endoscope needle of 1st embodiment of this invention, and shows the state by which the whole needle body was accommodated in the inside of an outer tube tube FIG. 5B is an overall view of an endoscope injection needle illustrating the endoscope injection needle according to the first embodiment of the present invention, and a part of the needle body protrudes from the tip of the outer tube. Indicates the state. It is a longitudinal cross-sectional view of the front-end | tip area | region of the injection needle 100 for endoscopes enclosed with a broken line circle in FIG. It is explanatory drawing explaining the base end surface and 1st virtual surface of the resin filling part of the injection needle for endoscopes which are the modifications of 1st embodiment. (A) is explanatory drawing explaining the injection needle for endoscopes of 1st embodiment of this invention, (b) is IV-IV sectional drawing of (a). It is a partial longitudinal cross-sectional view of the injection needle for endoscopes of 1st embodiment of this invention. (A)-(d) is explanatory drawing explaining the manufacturing method of the injection needle for endoscopes of 2nd 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 and the manufacturing method thereof according to the present invention do not have to be independent of each other, and a plurality of components are formed as a single member. Is formed of a plurality of members, a certain component is a part of another component, a part of a certain component overlaps with a part of another component, etc. Allow.

In the context of the present invention, the proximal position of the endoscope needle or the components constituting the endoscope needle is a position close to the operator of the endoscope needle (that is, the position of the endoscope needle). The position on the proximal side). Similarly, the distal means a position far from the operator of the endoscope injection needle (that is, a position on the tip side of the endoscope injection needle).
Further, in the present invention, the proximal end side means a side close to the operator of the endoscope injection needle, and the distal end side means a side far from the operator, that is, the most distal end side of the needle body.
In describing the present invention, the term “inner peripheral surface” or “outer peripheral surface” may be used as appropriate. Unless otherwise specified, the inner peripheral surface means a surface facing the central axis, and the outer peripheral surface means a surface not facing the central axis of the endoscope injection needle.
In the description of the present invention, the direction from the proximal end side to the distal end side or the direction from the distal end side to the proximal end side may be appropriately referred to as a distal proximal end direction.

<First embodiment>
Hereinafter, an endoscope needle 100 which is a first embodiment of an endoscope needle according to the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1A is an overall view of an endoscope injection needle 100 illustrating the endoscope injection needle according to the first embodiment of the present invention, and the entire needle body 10 is accommodated in the outer tube 30. It shows the state that was done. FIG. 1B is an overall view of the endoscope injection needle 100 and shows a state in which a part of the needle body 10 protrudes from the distal end of the outer tube 30.
FIG. 2 is a longitudinal sectional view of the distal end region of the endoscope injection needle 100 surrounded by a broken-line circle in FIG. However, in FIG. 2, the needle body 10 is viewed from the side.
FIG. 3 is an explanatory diagram for explaining the base end surface 130A and the first virtual surface 140 of the resin filling portion 110 of the endoscope injection needle 100A, which is a modification of the first embodiment. In FIG. 3, illustration of the inner tube 20 is omitted, and only the inner peripheral surface 11 of the inner tube 20 is illustrated.
FIG. 4A is an explanatory view illustrating the endoscope injection needle 100 according to the first embodiment of the present invention, and FIG. 4B is a cross-sectional view taken along the line IV-IV in FIG. .
FIG. 5 is a partial longitudinal sectional view of the endoscope injection needle 100 according to the first embodiment of the present invention. However, FIG. 5 is a side view of the needle body 10, the connection member 70, and the resin filling portion 110.
In addition, the connection member 70 in the injection needle 100 for endoscopes has the connection part main body 71 and the large diameter part 72 as shown in FIG. However, in FIG. 3 to FIG. 5 and FIG.

  As shown in FIGS. 1A and 1B, an endoscope injection needle 100 according to the present embodiment includes an outer tube 30 containing the inner tube 20 and an operation provided on the proximal end side. Part 50. The inner tube 20 in the endoscope injection needle 100 can be inserted together with the outer tube 30 into an endoscope channel (not shown).

FIG. 2 shows a cut surface obtained by cutting the distal end side of the endoscope injection needle 100 along the central axis 138.
As shown in FIG. 2, the endoscope injection needle 100 includes an inner tube 20, a needle body 10, a connection member 70, and a resin filling portion 110.
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 that penetrates in the direction of the central axis 138 of the inner tube 20 and through which the needle body 10 is inserted, and is between the inner peripheral surface of the inner tube tube 20 and the outer peripheral surface of the needle body 10. The needle body 10 and the inner tube 20 are connected to each other.
The resin filling unit 110 is configured to place a resin member between the outer peripheral surface of the needle body 10 protruding from the base end surface 73 of the connecting member 70 toward the base end side, the inner peripheral surface of the inner tube 20, and the base end surface 73 of the connecting member 70. Filled.
In the endoscope injection needle 100 according to the present embodiment, a first normal line 136 that is a normal line of the first virtual surface 140 is inclined with respect to the central axis 138. The first imaginary surface 140 is a cut surface with respect to the inner peripheral surface of the inner tube 20, and includes the most proximal point 132 and the most distal point 134, intersects the central axis 138, and intersects the normal and the central axis 138. Is the cut surface that minimizes.
In the present embodiment, the peripheral edge of the proximal end surface 130 of the resin filling portion 110 has a nearest point 132 and a most distal point 134 that are at different positions in the distal end direction.

In the present embodiment, the peripheral edge of the base end surface 130 means an intersection line 131 on the proximal side of the inner peripheral surface of the inner tube 20 and the outer peripheral surface of the resin filling portion 110 as shown in FIG. . That is, the peripheral edge of the base end surface 130 is an annular edge portion where the end portion on the proximal side of the joint surface between the inner peripheral surface of the inner tube 20 and the outer peripheral surface of the resin filling portion 110 is continuous in the circumferential direction.
The base end surface 130 is on the base end side of the resin filling portion 110 included in the region enclosed by the peripheral edge formed by the intersection line on the proximal side of the inner peripheral surface of the inner tube 20 and the outer peripheral surface of the resin filling portion 110. Point to the surface.

The proximal end surface 130 of the resin filling portion 110 in the endoscope injection needle 100 is configured as a surface other than a surface that is perpendicular to the central axis 138. In other words, the base end face 130 is a curved or uneven surface (that is, a non-flat surface) and is a plane orthogonal to the central axis 138 and is flat but intersects the central axis 138 at an angle other than 90 °. Including faces.
For example, the base end face 130 may be a substantially smooth surface while intersecting with the central axis 138 as shown in FIG. Further, as shown in FIG. 3, the resin filling portion 110 may include a base end surface 130 </ b> A that is a surface having irregular irregularities. In the present embodiment, the peripheral edge of the base end face 130 of the resin filling portion 110 may form an elliptical trajectory in the circumferential direction with respect to the inner peripheral face of the inner tube 20 as shown in FIG. An irregular trajectory that makes one round in the circumferential direction may be formed like a base end face 130A shown.
The outer edge of the base end surface 130 </ b> A is an intersection line 131 </ b> A on the proximal side of the inner peripheral surface 11 (see FIG. 3) of the inner tube 20 shown in FIG. 3 and the outer peripheral surface of the resin filling portion 110.
The peripheral edge includes a nearest point 132 and a distal most point 134 of the peripheral edge. The nearest position point 132 is a point located on the most peripheral side on the periphery. The most distal point 134 is a point located on the peripheral edge and the most distal side. By removing the perfect circle from the shape of the peripheral edge, the closest point 132 and the most distal point 134 are located at positions shifted in the extending direction of the central axis 138.
Therefore, the first normal 136 that is the normal of the first virtual plane 140 that includes the closest point 132 and the most distal point 134 and intersects the central axis 138 is inclined with respect to the central axis 138.

  The first virtual surface 140 can be defined as follows. That is, a cut surface I (not shown) obtained by cutting along the central axis 138 through the most proximal point 132 and the most distal point 134 is obtained. A cut surface obtained by cutting the inner tube tube 20 in a direction normal to the cut surface I and passing through the nearest point 132 and the most distal point 134 with respect to the inner peripheral surface of the inner tube 20 in the present embodiment. This is the first virtual surface 140.

  The first virtual surface 140 in the present embodiment is a surface that includes an arc connecting the nearest point 132 and the most distal point 134 at the shortest on the inner peripheral surface of the inner tube 20 and intersects the central axis 138.

Note that, in the endoscope injection needle 100 according to the present embodiment, the base end surface 130 and the first virtual surface 140 are substantially the same as shown in FIG. However, this embodiment is not limited to this.
For example, the present invention includes an aspect in which the proximal end surface 130A and the first virtual surface 140 are different from each other like an endoscope injection needle 100A which is a modification of the present embodiment shown in FIG. The peripheral edge of the base end surface 130A forms an irregular trajectory that makes one round in the circumferential direction with respect to the inner peripheral surface of the inner tube 20 that is not shown in FIG. For example, as shown in FIG. 3, the most distal point 134 may exist at a location deviated from the position facing the most proximal point 132 via the central axis 138 (not shown). The outer edge of the first virtual surface 140 shown in FIG. 3 includes the shortest arc connecting the nearest point 132 and the most distal point 134 on the inner peripheral surface 11 of the inner tube 20 (not shown), and intersects the central axis. ing.

  Here, the first normal line 136 in the endoscope injection needle 100 is inclined with respect to the central axis 138. That is, the base end surface 130 of the resin filling portion 110 is substantially orthogonal to the central axis 138. It means that the aspect which is is excluded. In the present embodiment, the displacement of the positions of the most proximal point 132 and the most distal point 134 in the direction of the distal end is caused by the fine apex of the fine protrusion on the proximal end surface 130 and the fine recess caused by the manufacturing difference. Beyond the distance to the bottom of the.

The first virtual surface 140 assumed from the most proximal point 132 and the most distal point 134 of the base end surface 130 in the resin filling portion 110 is inclined with respect to the central axis 138 as described above. That is, the base end face 130 is not a plane orthogonal to the central axis 138. Therefore, the discharge pressure of the liquid flowing through the inner tube 20 can be applied to the base end surface 130 in a direction different from the axial direction. Therefore, the resin filling part 110 is not easily pressed in the distal direction by the discharge pressure of the liquid, and the arrangement position of the resin filling part 110 is difficult to shift to the distal end side of the inner tube 20.
By providing the resin filling portion 110 described above, in the present embodiment, the connecting member 70 disposed on the distal end side with respect to the resin filling portion 110 and the arrangement position of the needle body 10 inserted through the connecting member 70 are the inner tube tube. The conventional problem of shifting to the tip end side of 20 is improved.

  From the viewpoint of improving the conventional problem described above, the first intersection angle α (see FIG. 2), which is the angle at which the first normal 136 and the central axis 138 intersect, is greater than 0 ° and less than 90 °. . The first crossing angle α is preferably 15 ° or more and less than 90 °, more preferably 30 ° or more and less than 90 °, and particularly preferably 45 ° or more and less than 90 °.

In the present embodiment, as shown in FIG. 2, the first intersection angle α, which is the angle at which the first normal line 136 and the central axis 138 intersect, is the second normal line that is the normal line of the base end face 73 of the connecting member 70. It is preferably larger than the second intersection angle, which is the angle at which 738 and the central axis 138 intersect.
In FIG. 2, the second normal line 738 and the central axis 138 show the same direction, and the second crossing angle is 0 °.

  Since the first crossing angle α is configured to be larger than the second crossing angle, the tip of the connecting member 70 caused by the liquid discharge pressure is compared with the case where the first crossing angle α is equal to the second crossing angle. The displacement of the arrangement position in the direction can be favorably avoided.

The base end surface 73 of the connecting member 70 is generally formed to be flat and substantially orthogonal to the central axis 138. Therefore, the second normal line 738 can be understood as the normal line of the main surface of the base end face 73. However, even when the base end face 73 is curved and not flat, the first crossing angle α and the second crossing angle are compared by virtualizing the second virtual face 736 shown in FIG. Can do. In FIG. 2, since the base end surface 73 is a flat surface orthogonal to the central axis 138, it is shown as the same surface as the second virtual surface 736. When the base end surface 73 is a surface other than a flat surface orthogonal to the central axis 138, the second virtual surface 736 and the base end surface 73 are shown as different surfaces (not shown).
Here, the second virtual surface 736 is a surface that includes the nearest point 731 at the periphery of the base end surface 73 of the connection member 70 and the most distal point 732 at the periphery and intersects the central axis 138. The peripheral edge of the base end surface 73 is a line of intersection on the proximal side of the inner peripheral surface of the inner tube 20 and the outer peripheral surface of the connection member 70. When an arbitrary layer is provided between the inner tube 20 and the connecting member 70, as an alternative to the intersection line, the outer peripheral surface of the connecting member 70 on the proximal side is the inner peripheral surface of the inner tube 20. The edge sequence closest to is understood as the peripheral edge.
The second virtual surface 736 can be defined as follows. That is, a cut surface I (not shown) obtained by cutting along the central axis 138 through the closest point 731 and the most distal point 732 is obtained. A cut surface obtained by cutting the inner tube tube 20 at a position in the normal direction of the cut surface I and passing through the most proximal point 731 and the most distal point 732 with respect to the inner peripheral surface of the inner tube 20 is a second virtual surface. 736.
In other words, the second virtual surface 736 includes an arc connecting the nearest point 731 and the most distal point 732 at the shortest on the outer peripheral surface of the connection member 70, and extends the connection member 70 or the connection member 70 to the proximal end side. It is a cut surface formed by cutting a virtual connection member (not shown).

  As a preferred example of the present embodiment, an angle at which the central axis 138 intersects with a third normal line (not shown) that is a normal line of the average base end surface formed by the peripheral edge of the base end surface 130 of the resin filling portion 110. The third intersection angle (not shown) may be configured to be 30 ° or more and less than 90 °.

Here, the average base end surface is an annular flat surface obtained by approximating the coordinates of a plurality of points on the periphery of the base end surface 130 among the cut surfaces of the inner peripheral surface of the inner tube 20 by the least square method. The coordinates of the plurality of points are the coordinates of the plotted points at, for example, about 10 points on the periphery of the base end face 130. Three variables, which are two variables indicating one-dimensional coordinates on the central axis 138 and the normal direction of an arbitrary cut surface, can be determined using the least square method. More specifically, by determining the cut surface (that is, the average base end surface) of the inner peripheral surface of the inner tube 20 that most closely approximates the coordinates of the plurality of points by the least square method, the normal direction of the cut surface Can be requested. The intersection angle between the normal direction and the central axis 138 is the third intersection angle.
The average base end surface of the base end surface 130 includes a case where it is substantially the same as the first virtual surface 140 and a case where it is different. The average proximal end surface of the endoscope injection needle 100 according to the present embodiment is configured to be substantially the same surface as the first virtual surface 140. In this configuration, the third normal line in the endoscope injection needle 100 is substantially the same as the first normal line 136, and the third crossing angle is the same as the first crossing angle α.

  By obtaining the average base end face from the base end face 130, for example, even when the base end face 130 has irregularities exceeding the irregularities due to manufacturing differences, the base end face 130 can be recognized macroscopically. . When the angle at which the third normal, which is the normal of the average base end face, and the central axis 138 intersect is 30 ° or more and less than 90 °, the direction in which the liquid discharge pressure is applied to the base end face 130 is determined. It can be significantly shifted from the central axis 138, and the desired problem of the present invention can be solved satisfactorily.

In consideration of the fact that the endoscope injection needle 100 is inserted through the endoscope channel, the resin filling unit 110 preferably further includes the following configuration.
That is, as shown in FIG. 4A, the resin-filled portion 110 in the endoscope injection needle 100 has a half volume on the side to which the nearest point 132 on the peripheral edge of the proximal end surface 130 of the resin-filled portion 110 belongs, and the central axis 138. It is larger than the half volume to which the opposing point 142 at the peripheral edge facing the nearest point 132 via (see FIG. 2) belongs.
In other words, the resin member constituting the resin filling portion 110 is unevenly distributed on the nearest point 132 side rather than the most distal point 134 side.

FIG. 4A shows a first line segment 154 formed by connecting the nearest point 132 on the periphery of the base end face 130 and an opposing point 142 on the periphery facing the nearest point 132 via the central axis 138. . In the endoscope injection needle 100 shown in FIG. 4A, the opposite point 142 is the most distal point 134.
Here, the half volume on the side to which the nearest point 132 belongs is the resin filling portion 110 that is orthogonal to the first line segment 154 and divided in the vertical direction along the central axis 138, and is the nearest point. This is the volume of the first divided portion 144 on the side including 132. Further, the half volume on the side to which the facing point 142 belongs is the volume of the second divided portion 146 on the side including the facing point 142 in the resin filling portion 110 divided in the vertical direction as described above.
The sum of the volume of the first divided portion 144 and the volume of the second divided portion 146 described above indicates the volume of the resin filling portion 110 located on the proximal end side with respect to the proximal end surface 73 of the connecting member 70.

According to the endoscope injection needle 100 in which the resin member constituting the resin filling portion 110 is unevenly distributed on the closest point 132 side, when sliding in the proximal end direction in the channel of the bending endoscope, the resin member The second divided portion 146 having a small amount of uneven distribution is easier to bend than the first divided portion 144. Therefore, as shown in FIG. 5, the second divided portion 146 (see FIG. 4A) tends to be naturally positioned on the inner peripheral side in the path in the bending channel (not shown). That is, the most distal point 134 tends to be naturally located on the inner peripheral side of the path of bending of the endoscope injection needle 100.
As described above, the side that is easily bent in the resin-filled portion 110 is naturally positioned on the inner peripheral side, whereby the endoscope injection needle 100 smoothly moves while being bent in the channel of the bending endoscope. It is.

An inner portion of the base end face 130 is provided with a resin filling portion 110 in which the half volume on the side to which the nearest point 132 belongs is larger than the half volume to which the opposite point 142 on the periphery facing the nearest point 132 via the central axis 138 belongs. The endoscope injection needle 100 preferably further comprises the following configuration.
That is, as shown in FIGS. 4A and 4B, the endoscope injection needle 100 according to the present embodiment has the distal end surface 152 of the needle body 10 inclined with respect to the central axis 138. The most distal portion X of the distal end surface 152 is arranged on the side to which the nearest point 132 on the periphery of the base end surface 130 of the resin filling portion 110 belongs. The most advanced portion X is disposed on the first divided portion 144 side in a top view. Here, the top view means that the endoscope injection needle 100 is observed from the proximal end side toward the distal end side.

  According to the arrangement of the most advanced portion X, as shown in FIG. 5, when the endoscope injection needle 100 slides in the distal direction in the channel of the bending endoscope, the most advanced portion X bends. It tends to be located on the outer peripheral side of the outer tube 30. The most advanced portion X slides in the bending direction while being located near the inner peripheral surface of the outer tube 30 on the outer peripheral side. Therefore, the most distal portion X comes into contact with the inner peripheral surface of the outer tube 30 and the sliding of the needle body 10 with respect to the distal direction of the outer tube 30 becomes poor, or the needle body 10 protrudes from the tip of the outer tube 30 Problems such as poor operation can be reduced.

  For comparison, the most distal portion X of the needle body 10 is shown in FIG. 5 with the needle body 10B arranged on the side to which the most distal point 134 of the peripheral edge of the base end face 130 belongs as an imaginary line. Since the most distal portion X of the needle body 10B slides in the bending direction while being positioned on the inner peripheral side of the path where the outer tube 30 bends, it is close to the inner peripheral surface of the outer tube 30 and There is a risk of contact.

  Next, the detail of each structure in the injection needle 100 for endoscopes is demonstrated.

As shown in FIGS. 1A and 1B, an endoscope injection needle 100 according to this embodiment includes an outer tube 30 that encloses the inner tube 20 so as to be able to advance and retreat. “Advancing and retracting” means being slidable in the proximal direction.
The outer tube 30 is a long tube that can accommodate the inner tube 20 and the needle body 10. The outer tube 30 can store the needle body 10 so as to protrude from an opening provided at an arbitrary position of the outer tube 30. Therefore, for example, the needle body 10 is protruded from the opening of the outer tube 30 at the timing of treatment in the body tissue in the body cavity, and the needle body 10 is included until the needle body 10 reaches the body tissue. It is possible to avoid the tip of the needle body 10 from contacting the body cavity. Details of the outer tube 30 will be described later.

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 that is 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 inserted into the body tissue of the subject. Moreover, an opening (not shown) is provided at the tip of the needle body 10, and an operator can inject a liquid into a living tissue 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 (protruding state, FIG. b)), and shifting the needle body 10 from one of the protruding states to the other (the stored state, see FIG. 1A).
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 (FIG. 1B).

  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 shows a cross-sectional view of the distal end region of the endoscope injection needle 100 in a protruding state. An opening through which the needle body 10 can project is provided at the distal end of the outer tube 30. The tip having the opening is, for example, formed in a tapered shape by bending inward in the radial direction. In other words, the opening diameter of the tapered tip of the outer tube 30 is smaller than the outer diameter of the tip of the inner tube 20 or the outer diameter of the tip of the connecting member 70. When the inner peripheral surface of the tapered tip contacts the tip of the inner tube 20 or the tip of the connecting member 70, the movement of the inner tube 20 and the connecting member 70 in the tip direction can be restricted.

  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 connecting member 70, the needle body 10 and the inner tube 20 can be connected via the connecting member 70 even if there is a significant distance between the outer peripheral 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 inserted through the outer tube 30 so as to be able to advance and retreat.
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 peripheral surface of the outer tube 30 and the outer peripheral 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.

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 an optional thin resin layer to be formed between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the needle body 10. It is preferable that the said resin layer fulfill | performs joining of the needle body 10 and the connection member 70, for example, the resin connection part 90 mentioned later corresponds. The resin layer may have a function of improving water tightness between the needle body 10 and the connection member 70.
The connection member 70 is a cylindrical body, for example, a cylindrical body.

As shown in FIG. 2, the connection member 70 in the present embodiment has a connection portion main body 71 on the proximal end side, and has an outer diameter larger than the outer diameter of the connection portion main body 71 on the distal end side than the connection portion main body 71. A large-diameter portion 72 is provided. For example, the outer diameter of the large diameter portion 72 is larger than the inner diameter of the inner tube 20 and smaller than the outer diameter of the inner tube 20. The outer diameter of the connecting portion main body 71 is substantially the same as the inner diameter of the inner tube 20.
In this embodiment, both the connection part main body 71 and the large diameter part 72 have a cylindrical outer shape. However, the connection member 70 in the present embodiment is not limited to this, and may include at least the connection portion main body 71 and the large diameter portion 72 may be omitted.

  The connection member 70 is provided with an insertion hole 80 for inserting the needle body 10. In the present embodiment, the needle body 10 has a distal end and a proximal end protruding from both ends of the insertion hole 80. The needle body 10 is inserted into the insertion hole 80 and held by the connection member 70. The holding means for holding the needle body 10 in the connecting member 70 is not particularly limited.

For example, when the connecting member 70 is formed of a resin member by insert molding or the like, the following examples can be given as the holding means. That is, a heat shrinkable member can be arranged in the circumferential direction of the outer peripheral surface of the connecting member 70 through which the needle body 10 is inserted, and the heat shrinkable member can be heated to tighten the connecting member 70 inward in the radial direction (hereinafter, Also called heat shrinkage retention means). As a result, the needle body 10 inserted through the insertion hole 80 is unlikely to fall out of the insertion hole 80 and can be satisfactorily held by the connection member 70.
When the connection member 70 is made of a metal material, the connection member 70 through which the needle body 10 is inserted is caulked to physically connect a part of the outer peripheral surface of the needle body 10 and a part of the inner peripheral surface of the connection member 70. The needle body 10 can also be held by being brought into contact with (hereinafter also referred to as caulking holding means).

  The constituent members of the connecting member 70 are not particularly limited. For example, the connecting member 70 is an aspect made of a resin member formed by insert molding, a coil formed by spirally winding a metal linear member, or a tube having a curved and substantially flat wall surface made of a metal material such as stainless steel. The aspect which consists of a shape body is included.

Next, the resin filling unit 110 will be described. The endoscope injection needle 100 is formed between the outer peripheral surface of the needle body 10 protruding from the base end surface 73 of the connection member 70 to the base end side, the inner peripheral surface of the inner tube 20, and the base end surface 73 of the connection member 70. A resin filling unit 110 is provided that is filled with a resin member.
The resin filling part 110 in the present embodiment is continuous in the circumferential direction around the central axis 138. As described above, the first normal line 136 that is the normal line of the first virtual surface 140 in the resin filling portion 110 is inclined with respect to the central axis 138.

  In the present embodiment, the resin filling portion 110 has an inner peripheral surface of the inner tube 20 and an outer periphery of the needle body 10 between the position including the most distal point 134 in the distal proximal direction and the proximal end surface 73 of the connecting member 70. Between the surfaces, the resin member is substantially filled in a solid state.

  Here, as shown to Fig.4 (a), in this embodiment, the distance Y from the most distal point 134 of the periphery of the base end surface 130 of the resin filling part 110 to the periphery of the base end surface 73 of the connection member 70 is the following. The distance between the outer peripheral surface of the needle body 10 and the inner peripheral surface of the inner tube 20 is greater than or equal to Z. Therefore, it is difficult for the liquid to permeate to the tip side of the resin filling part 110 and the water tightness of the inner tube 20 is excellent.

  Although the resin material which comprises the resin filling part 110 is not specifically limited, For example, it is resin members which can be used as adhesives, such as an epoxy resin, a urethane resin, and a cyanoacrylate resin, or heat, such as ABS resin, a polyamide resin, and a urethane resin A plastic resin can be mentioned.

  In the present embodiment, a resin connection portion 90 made of a resin material that is located between the inner peripheral surface of the connection member 70 and the outer peripheral surface of the needle body 10 and that connects the connection member 70 and the needle body 10 may be further provided. Good. As shown in FIG. 2, the resin connection portion 90 can be provided so as to be continuous with the resin filling portion 110.

By providing the resin connection part 90, the connection member 70 and the needle body 10 can be favorably joined. Therefore, the needle body 10 can be prevented from dropping from the connecting member 70.
Here, the endoscope injection needle 100 according to the present embodiment includes the resin filling portion 110, thereby preventing the arrangement position of the connecting member 70 in the inner tube 20 from shifting to the distal end side due to the discharge pressure of the liquid. This is as described above. Thus, the needle body 10 that is favorably joined to the connecting member 70 that is prevented from being displaced in the distal end direction, together with the connecting member 70, has a favorable arrangement position in the proximal end direction that is initially planned. It can be maintained.

  Further, since the resin connecting portion 90 is provided, a gap between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the needle body 10 can be closed, so that the water tightness between the connecting member 70 and the needle body 10 is achieved. Will improve.

Although the resin member which comprises the resin connection part 90 is not specifically limited, For example, the resin member similar to the resin member for comprising the resin filling part 110 may be sufficient.
The resin connection part 90 and the resin filling part 110 may be comprised from the same resin member, and both may be integrally formed with the same resin. Moreover, as another aspect, the resin connection part 90 and the resin filling part 110 may be comprised by the different resin member. For example, the resin connecting portion 90 in the present embodiment is formed integrally with the resin filling portion 110 by the same resin member as the resin member constituting the resin filling portion 110 in the same step as the step constituting the resin filling portion 110. May be.

  In the endoscope injection needle 100 according to the present embodiment, a second resin connection portion (not shown) may be provided between the proximal end side surface of the large diameter portion 72 and the distal end surface of the inner tube 20. . By providing the second resin connection portion, it is possible to further ensure the bondability between the connection member 70 and the distal end of the inner tube 20. This prevents the liquid flowing through the inner tube 20 from leaking from the distal end side of the inner tube 20 into the body cavity, and allows body fluid to enter between the inner tube 20 and the connection member 70 from the body cavity side. Is prevented.

  Furthermore, in the endoscope injection needle 100 according to the present embodiment, a third resin connecting portion (not shown) may be provided between the outer peripheral surface of the connecting member 70 and the inner peripheral surface of the inner tube 20. The third resin connection portion may be provided continuously with the second resin connection portion described above. If the third resin connection portion is provided continuously with the second resin connection portion, the third resin connection portion is reliably formed between the outer peripheral surface of the connection member 70 and the inner peripheral surface of the inner tube 20. It can be confirmed by visually confirming the second resin connecting portion. By providing the third resin connecting portion, the connectivity between the inner tube 20 and the connecting member 70 is improved, and the water tightness between the inner tube 20 and the connecting member 70 is improved.

Although the resin member which comprises the 2nd resin connection part mentioned above and the 3rd resin connection part is not specifically limited, For example, the resin member similar to the resin member for comprising the resin filling part 110 may be sufficient.
For example, the second resin connection portion and the third resin connection portion are integrated with the resin filling portion 110 by the same resin member as the resin member constituting the resin filling portion 110 in the same step as the step of constituting the resin filling portion 110. It may be formed automatically. Alternatively, as another aspect, the resin filling part 110 may be formed of the same resin as the resin constituting the resin filling part 110 or a different resin in a process different from the process of forming the resin filling part 110. The endoscope injection needle 100 can exhibit excellent water-tightness by continuously providing the resin filling portion 110, the second resin connection portion, and the third resin connection portion.

<Second embodiment>
Next, a method for manufacturing an endoscope injection needle (hereinafter also simply referred to as “the present manufacturing method”) according to a second embodiment of the present invention will be described with reference to FIGS. 6 (a) to 6 (d). FIG. 6A to FIG. 6D are explanatory views for explaining the manufacturing method divided into several steps. This manufacturing method will be described taking a method of manufacturing the endoscope injection needle 100 as an example.

This manufacturing method includes an insertion step of inserting the needle body 10 into an insertion hole 80 (not shown), an external fitting step of externally fitting the mold member 300 to the connection member 70, and a resin filling for forming the resin filling portion 110. A part forming step and an inner tube attaching step for attaching the inner tube 20.
The insertion step is a step of inserting the needle body 10 into the insertion hole 80 in the connection member 70 so as to protrude from the distal end side and the proximal end side of the connection member 70.
The external fitting process is a process of externally fitting a mold member 300 having an inner diameter substantially equal to the outer diameter of the connection member 70 to the proximal end side of the connection member 70.
In the resin filling portion forming step, the resin member is injected into the mold member 300 in contact with the inner peripheral surface of the mold member 300, the outer peripheral surface of the needle body 10, and the proximal end surface 73 of the connecting member 70, and the proximal direction In contrast, the resin filling portion 110 is formed so that the base end face 130 of the resin filling portion 110 is inclined.
The inner tube attaching step is a step of providing the inner tube so as to enclose at least a part of the connecting member and the resin filling portion 110.

According to this manufacturing method, the injection needle 100 for endoscope provided with the resin filling part 110 can be manufactured.
Below, each process of this manufacturing method is demonstrated in detail suitably using FIG. 6 (a)-FIG.6 (d).

First, in order to carry out the insertion step, the needle body 10 and the connection member 70 are prepared, and the needle body 10 is inserted into an insertion hole 80 (not shown) provided in the connection member 70 in FIG. In the insertion step, the needle body 10 is inserted so as to protrude from the distal end side and the proximal end side of the connecting member 70 as shown in FIG. Although the protrusion length from which the needle body 10 protrudes from the connection member 70 is not particularly limited, the protrusion length of the needle body 10 on the proximal end side may be longer than the axial length of the resin filling portion 110 formed in a later step. desirable.
In the insertion step or after the insertion step, a holding step for holding the needle body 10 on the connecting member 70 may be further performed as appropriate. Examples of the holding step include, but are not limited to, implementation of the heat shrinkage holding means or the caulking holding means described in the first embodiment.
In addition, the needle body 10 used in the present embodiment has a distal end surface that is inclined with respect to the central axis and has the most advanced portion X.

  Although not shown in the drawing, the resin connection portion 90 (see FIG. 2) may be formed in a step subsequent to the insertion step. In this case, after the insertion step or the insertion step, a gap communicating in the distal direction from the proximal end surface 73 may be formed in advance between the outer peripheral surface of the needle body 10 and the inner peripheral surface of the connection member 70. For example, when the connection member 70 is formed by insert molding, the gap includes a wedge member having a predetermined thickness for securing the gap, and an outer peripheral surface of the needle body 10 and an inner peripheral surface of the connection member 70 made of a resin member. It can be formed by driving it into the boundary and removing it. Alternatively, the gap can be provided by caulking the connection member 70 made of a metal material into which the needle body 10 is inserted. That is, a part of the inner peripheral surface of the connection member 70 and a part of the outer peripheral surface of the needle body 10 are brought into contact with each other at the caulked portion, and the gap is formed between the portion and the base end surface 73. it can.

Next, the external fitting process will be described. First, a mold member 300 having an inner diameter substantially equal to the outer diameter of the connection member 70 is prepared. Here, “substantially equivalent” means that the gap where the outer diameter of the connecting member 70 and the inner diameter of the mold member 300 are substantially the same and the gap where the third resin connecting portion can be formed on the outer peripheral surface of the connecting member 70. This is intended to encompass the case where the inner diameter of the mold member 300 is larger than the outer diameter of the connecting member 70 to the extent that it can be secured.
The external fitting process is performed by externally fitting the mold member 300 to at least the base end side of the connecting member 70. FIG. 6A shows a mode in which the mold member 300 is fitted to the connection member 70 so as to cover a partial region on the proximal end side of the connection member 70. However, the present invention is not limited to this. The member 300 may be fitted so as to cover the entire outer peripheral surface of the connection member 70.

  In the resin filling portion forming step, the resin member is injected into the mold member 300 so as to be in contact with the inner peripheral surface of the mold member 300, the outer peripheral surface of the needle body 10, and the proximal end surface 73 of the connecting member 70, and the proximal direction In contrast, the resin filling portion 110 is formed so that the base end face 130 of the resin filling portion 110 is inclined. Here, the fact that the base end surface 130 is inclined is not limited to a mode in which the base end surface 130 that is a substantially smooth surface is inclined with respect to the axial direction as shown in FIG. As described in the first embodiment with reference to FIG. 2, the resin filling portion forming step is a cut surface with respect to the inner peripheral surface of the inner tube 20 and the nearest point 132 on the periphery of the proximal end surface 130 of the resin filling portion 110. In addition, the first normal line that is the normal line of the first virtual plane 140 that includes the most distal point 134 of the peripheral edge and intersects the central axis 138 and has a minimum crossing angle between the normal line and the central axis 138. The resin filling portion 110 is formed so that 136 inclines with respect to the central axis 138.

The following processes can be mentioned as an example of the preferable aspect of a resin filling part formation process.
That is, as shown in FIG. 6A, in the resin filling portion forming step, the tip of the injection tube 400 for injecting the resin member into the inside of the mold member 300 is placed close to the inner peripheral surface of the mold member 300. To do. Next, as shown in FIG. 6B, the resin member is poured into the mold member 300. It is possible to incline the base end surface 130 of the resin filling part 110 formed by this with respect to an axial direction.

When the mold filling member 300 is arranged substantially parallel to the direction of gravity and the resin filling portion forming step is performed, it is preferable to pay attention to the following points, for example. That is, before the base end surface of the resin member injected into the mold member 300 by the injection tube 400 is leveled, the injected resin member is at least semi-dried, or the base end surface of the resin member is leveled in a short time. It is preferable to adjust the viscosity of the resin member to such an extent that it is difficult.
By performing the resin filling part formation process mentioned above, the resin filling part 110 provided with the base end face 130 can be formed easily.

Furthermore, in the resin filling portion forming step, it is preferable to pay attention to the following points regarding the arrangement position of the tip of the injection tube 400.
That is, in the resin filling portion forming step, the top end of the injection tube 400 is arranged close to the side on which the most distal portion X of the needle body 10 is arranged in top view. Then, when the resin member is injected so that the half volume on the side to which the closest point 132 of the resin filling portion 110 (see FIG. 6C) formed in this step belongs is larger than the half volume to which the opposite point 142 belongs. Good.
Here, the top view means observing the foremost portion X direction of the needle body 10 from the opening side of the mold member 300. For example, when the mold member 300 is arranged substantially parallel to the weight direction. Means to observe from above in the weight direction.
For the description of the half volume on the side to which the closest point 132 belongs and the half volume to which the opposing point 142 belongs, the description on the first embodiment can be referred to as appropriate.

  Thus, by paying attention to the arrangement position of the distal end of the injection tube 400 and the arrangement position of the most distal end portion X of the needle body 10, as shown in FIG. It is possible to arrange the portion X on the side to which the nearest point 132 on the periphery of the base end face 130 belongs.

In the resin filling portion process, when the resin member is injected from the injection tube 400 into the mold member 300, the resin member is also filled in the gap formed between the needle body 10 and the connection member 70. Thus, the resin connection portion 90 (not shown) can be formed. Similarly, a third resin connection portion (not shown) can be formed by injecting the resin member into a gap formed between the connection member 70 and the mold member 300.
In the resin filling portion forming step, the resin filling portion 110 and the resin connecting portion 90 and / or the third resin connecting portion are formed by forming the resin connecting portion 90 and / or the third resin connecting portion together with the formation of the resin filling portion 110. Can be formed integrally.

After the resin filling portion forming step, as shown in FIG. 6D, an inner tube tube attaching step is performed.
The inner tube mounting step is a step of providing the inner tube 20 so as to enclose at least a part of the connecting member 70 and the resin filling portion 110.
More specifically, for example, after the resin filling portion forming step, the mold member 300 is extracted from the connecting member 70 (see FIG. 6C), and at least the proximal end side of the formed resin filling portion 110 and the connecting member 70 The inner tube 20 is externally fitted to cover

  For example, when the resin filling portion 110 is semi-cured, the inner tube tube mounting step is performed, and then the resin filling portion 110 is completely cured, whereby the inner peripheral surface of the inner tube 20 and the resin filling portion 110 are cured. Can be joined to the outer peripheral surface.

  As described above, the endoscope injection needle 100 can be manufactured by carrying out this manufacturing method.

The first embodiment and the second embodiment 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 2nd 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 2nd 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,
There is an insertion hole that penetrates in the direction of the central axis of the inner tube and passes through the needle body, and is disposed between the inner peripheral surface of the inner tube tube and the outer peripheral surface of the needle body, A connecting member for connecting the inner tube,
A resin filling portion formed by filling a resin member between the outer peripheral surface of the needle body protruding from the base end surface of the connection member to the base end side, the inner peripheral surface of the inner tube, and the base end surface of the connection member. When,
Have
A cutting surface with respect to the inner peripheral surface of the inner tube, which includes the most proximal point of the peripheral edge of the base end surface of the resin-filled portion and the most distal point of the peripheral edge and intersects the central axis, and a normal line and a central axis An endoscope needle, wherein a first normal, which is the normal of the first virtual plane, which is a cut surface having a minimum crossing angle, is inclined with respect to the central axis.
(2) The injection needle for endoscope according to (1), further including an outer tube that encloses the inner tube so as to be able to advance and retreat.
(3) The first intersection angle, which is the angle at which the first normal line and the central axis intersect, is the angle at which the second normal line, which is the normal line of the base end surface of the connection member, and the central axis intersect. The endoscope injection needle according to (1) or (2) above, which is larger than the second crossing angle.
(4) The third intersection angle, which is an angle at which the central axis and the third normal line that is the normal line of the average base end surface formed by the peripheral edge of the base end surface of the resin-filled portion, is 30 °. The endoscope needle according to any one of (1) to (3), which is less than 90 °.
(5) The resin filling portion is opposed to the peripheral edge where the half volume on the side to which the nearest point of the peripheral edge of the base end surface of the resin filling portion belongs is opposed to the nearest point via the central axis. The injection needle for endoscope according to any one of (1) to (4), wherein the needle is larger than a half volume to which the point belongs.
(6) The tip surface of the needle body is inclined with respect to the central axis,
The injection needle for endoscope according to (5), wherein the most distal end portion of the distal end surface is disposed on a side to which the nearest point of the peripheral edge of the base end surface of the resin filling portion belongs.
(7) The distance from the most distal point of the peripheral edge of the base end surface of the resin filling portion to the peripheral edge of the base end surface of the connection member is the distance between the outer peripheral surface of the needle body and the inner tube. The endoscope needle according to any one of (1) to (6), which is equal to or greater than a distance from a peripheral surface.
(8) having a resin connection portion made of a resin material located between the inner peripheral surface of the connection member and the outer peripheral surface of the needle body and connecting the connection member and the needle body;
The endoscope needle according to any one of (1) to (7), wherein the resin connection portion and the resin filling portion are continuous.
(9) A method for manufacturing an endoscope needle for manufacturing the endoscope needle according to (1) to (8) above,
An insertion step of inserting the needle body so as to protrude from the distal end side and the proximal end side of the connection member into the insertion hole in the connection member;
An external fitting step of externally fitting a mold member having an inner diameter substantially equal to the outer diameter of the connection member on the proximal end side of the connection member;
The resin member is injected into the mold member in contact with the inner peripheral surface of the mold member, the outer peripheral surface of the needle body, and the proximal end surface of the connecting member, and the resin filling portion A resin filling portion forming step of forming the resin filling portion so that the base end face is inclined;
An inner tube tube mounting step of providing the inner tube so as to enclose at least a part of the connecting member and the resin filling portion.
(10) In the resin filling portion forming step, the tip of an injection tube for injecting the resin member into the inside of the mold member is placed close to the inner peripheral surface of the mold member, and the resin member is The method for manufacturing an endoscope injection needle according to (9), wherein the base end surface of the resin filling portion to be formed is inclined with respect to the axial direction by being injected into a mold member.
(11) In the resin filling portion forming step, the top end of the injection tube is brought close to the side where the most distal end portion of the needle body is arranged in top view, and the closest point of the resin filling portion to be formed belongs to The method for manufacturing an endoscope injection needle according to (10), wherein the resin member is injected so that the half volume of the is larger than the half volume to which the opposing point belongs.

DESCRIPTION OF SYMBOLS 10, 10B ... Needle body 11 ... Inner peripheral surface 20 ... Inner tube tube 30 ... Outer tube tube 40 ... Outer cylinder grip 41 ... Guide groove 50 ... Operation part 51- ··· Connector 60 ··· Inner cylinder grip 61 ··· Projection portion 70 ··· Connection member 71 ··· Connection portion main body 72 ··· Large diameter portion 73 ··· Base end surface 80 ··· Insertion hole 90 · ···································································································· Endoscope injection needle 110 ··· resin filled portion 130, 130A ... proximal end surface 131, 131A ... · Distal point 136 ··· First normal line 138 ··· Central axis 140 ··· First imaginary plane 142 · · · Point 144 ··· First division portion 146 ··· Second division portion 152 ... tip end surface 154 ... first line segment 300 ... formwork member 400 ... injection tube 731 ... Proximal point 732 ... Distal point 736 ... Second imaginary plane 738 ... Second normal α ... First crossing angle X ... Most advanced portion Y ... Distance Z ... ·distance

Claims (11)

An inner tube for injecting liquid;
A needle provided at the tip of the inner tube,
There is an insertion hole that penetrates in the direction of the central axis of the inner tube and passes through the needle body, and is disposed between the inner peripheral surface of the inner tube tube and the outer peripheral surface of the needle body, A connecting member for connecting the inner tube,
A resin filling portion formed by filling a resin member between the outer peripheral surface of the needle body protruding from the base end surface of the connection member to the base end side, the inner peripheral surface of the inner tube, and the base end surface of the connection member. When,
Have
A cutting surface with respect to the inner peripheral surface of the inner tube, which includes the most proximal point of the peripheral edge of the base end surface of the resin-filled portion and the most distal point of the peripheral edge and intersects the central axis, and a normal line and a central axis An endoscope needle, wherein a first normal, which is the normal of the first virtual plane, which is a cut surface having a minimum crossing angle, is inclined with respect to the central axis.   The injection needle for endoscope according to claim 1, further comprising an outer tube that encloses the inner tube so as to be able to advance and retreat.   The first intersection angle, which is the angle at which the first normal line and the central axis intersect, is the angle at which the second normal line, which is the normal line of the base end surface of the connecting member, and the central axis intersect. The injection needle for an endoscope according to claim 1 or 2, which is larger than a two-intersection angle.   A third intersection angle, which is an angle at which the central axis and a third normal line that is a normal line of an average base end surface formed by the peripheral edge of the base end surface of the resin-filled portion, is 30 ° or more and 90 °. The injection needle for an endoscope according to any one of claims 1 to 3, wherein the injection needle is less than the number.   The resin-filled portion has an opposing point at the periphery where the half volume on the side to which the nearest point of the base end surface of the resin-filled portion belongs is opposed to the nearest point via the central axis. The injection needle for endoscope according to any one of claims 1 to 4, wherein the injection needle is larger than a half volume. The tip surface of the needle body is inclined with respect to the central axis,
6. The endoscope injection needle according to claim 5, wherein a most distal end portion of the distal end surface is arranged on a side to which the nearest point of the peripheral edge of the base end surface of the resin filling portion belongs.   The distance from the most distal point of the peripheral edge of the base end surface of the resin filling portion to the peripheral edge of the base end surface of the connecting member is the outer peripheral surface of the needle body and the inner peripheral surface of the inner tube. The injection needle for an endoscope according to any one of claims 1 to 6, which is equal to or greater than the distance. A resin connecting portion made of a resin material that is located between the inner peripheral surface of the connecting member and the outer peripheral surface of the needle body and connects the connecting member and the needle body;
The endoscope injection needle according to any one of claims 1 to 7, wherein the resin connection portion and the resin filling portion are continuous. An endoscope injection needle manufacturing method for manufacturing the endoscope injection needle according to claim 1,
An insertion step of inserting the needle body so as to protrude from the distal end side and the proximal end side of the connection member into the insertion hole in the connection member;
An external fitting step of externally fitting a mold member having an inner diameter substantially equal to the outer diameter of the connection member on the proximal end side of the connection member;
The resin member is injected into the mold member in contact with the inner peripheral surface of the mold member, the outer peripheral surface of the needle body, and the proximal end surface of the connecting member, and the resin filling portion A resin filling portion forming step of forming the resin filling portion so that the base end face is inclined;
An inner tube tube mounting step of providing the inner tube so as to enclose at least a part of the connecting member and the resin filling portion.   In the resin filling portion forming step, a tip of an injection tube for injecting the resin member into the inside of the mold member is placed close to an inner peripheral surface of the mold member, and the resin member is installed in the mold member The method for manufacturing an endoscope injection needle according to claim 9, wherein the base end surface of the resin filling portion to be formed is inclined with respect to the axial direction by being injected into the endoscope.   In the resin filling portion forming step, the top end of the injection tube is brought close to the side where the most distal portion of the needle body is arranged in top view, and the half of the side where the nearest point of the resin filling portion to be formed belongs The method for manufacturing an endoscope injection needle according to claim 10, wherein the resin member is injected so that a volume becomes larger than the half volume to which the opposing point belongs.

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