JP4493126B2 - Endoscopic needle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope injection needle that is introduced into a body cavity through a channel of an endoscope and injects a drug into a tissue site in the body cavity.
[0002]
[Prior art]
An injection needle is introduced into a body cavity through a channel of an endoscope, and a drug solution is injected into an affected part or the like in the body cavity. An injection needle used in this case is known in Japanese Utility Model Laid-Open No. 6-81544. The injection needle has an outer sheath and an inner sheath, and a needle is attached to the distal end of the inner sheath that can be moved forward and backward with respect to the outer sheath. Then, when used, after being introduced into the body cavity through the channel of the endoscope, the inner sheath is pushed in, so that the needle protrudes from the distal end of the outer sheath and punctures the tissue site in the body cavity.
[0003]
[Problems to be solved by the invention]
This type of endoscope injection needle is mainly used with an outer diameter of 0.5 to 0.8 mm. However, needles with various needle diameters are required depending on the use conditions of the user. It is done.
[0004]
In a conventional endoscope injection needle, the inner tube has an inner diameter substantially the same as an outer diameter of the needle because the distal end portion of the inner tube is fitted and attached to the outer periphery of the needle. For this reason, when the needle diameter changes, it is necessary to change the inner diameter of the inner tube. That is, there is a situation in which an inner tube having a size suitable for each needle diameter must be prepared.
[0005]
Further, the inner tube to which the needle is attached not only allows the needle to advance and retreat, but also serves as a conduit for supplying the chemical solution to the needle, so the inner diameter cannot be reduced arbitrarily. Moreover, in order to ensure that the liquid feeding operation is performed with a light force, it is necessary to make the inner diameter of the inner tube as large as possible.
[0006]
However, as described above, when the inner tube is made to have the same inner diameter as the outer diameter of the needle, in the case of a small-diameter needle, the inner diameter of the inner tube is inevitably small, and the liquid feeding force is large. Becomes heavy. In order to solve this problem, it is possible to use an inner tube with a large inner diameter and make only the tip of the inner tube small, but in order to make only the tip of the inner tube small, This requires troublesome work such as thermoforming for shaping while applying, and takes a considerable amount of time, and on the contrary, it becomes an expensive instrument.
[0007]
The present invention has been made paying attention to the above circumstances, and an object of the present invention is to solve the above-mentioned problems and to provide an inexpensive endoscope injection needle.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an outer tube, an inner tube inserted in the outer tube so as to freely advance and retract, an operation unit for performing the advance / retreat operation of the inner and outer tubes, and a tip of the inner tube. An attached needle body, and a member that fills a clearance caused by a difference between an outer diameter of the needle body and an inner diameter of the inner tube and connects the inner tube and the needle body, and the needle body includes: Having a portion extending to the base end side of the inner tube in the inner tube beyond the base end surface of the member, applying an adhesive from the outer periphery of the member to a position covering the base end of the member, An endoscope injection needle characterized in that the inner tube and the needle body are connected by bonding the member and the needle body to the inner tube within the inner tube .
As a result, it is possible to make an inner tube having a large inner diameter as much as possible on a needle body having various needle diameters without performing a process such as thermoforming, and an endoscope injection needle can be provided at low cost.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
(Constitution)
FIG. 1 is an external view of the entire endoscope injection needle according to the present embodiment, FIG. 2 is a longitudinal sectional view of the vicinity of the distal end portion of the endoscope injection needle, and FIG. 3 is for the endoscope. It is a longitudinal cross-sectional view of the vicinity of the proximal end portion of the injection needle.
[0010]
The endoscope injection needle includes an outer tube 1, an inner tube 2 that can move forward and backward in the outer tube 1, a needle body 3 attached to the distal end of the inner tube 2, and a proximal end of the outer tube 1. And an attached operation unit 4.
[0011]
The outer tube 1 is made of a resin such as a fluorine tube or a nylon tube, and has an inner diameter of about 1.7 mm and an outer diameter of 2.4 mm. The inner tube 2 is also made of a resin such as a fluorine tube or a nylon tube, and has an inner diameter of about 0.85 mm and an outer diameter of 1.55 mm. The needle tip 5 of the needle body 3 attached to the tip of the inner tube 2 is formed in a sharp blade shape that is cut obliquely at an angle of 30 degrees.
[0012]
The operation unit 4 has a main body 6 fixedly attached to the proximal end of the outer tube 1, and is attached to the proximal end of the inner tube 2 via a stainless steel pipe 7, and has a base 8 at the proximal end. The base unit 9 is made of ABS. The main body 6 and the base unit 9 can freely move back and forth. As shown in FIG. 1A, when the base unit 9 is pulled toward the hand side with respect to the main body 6, the needle body 3 is accommodated in the outer tube 1. . As shown in FIG. 1B, when the base unit 9 is pushed into the main body 6, the needle body 3 protrudes from the distal end opening 10 of the outer tube 1.
[0013]
The distal end of the outer tube 1 is formed in a bowl shape in which a locking contact portion 11 composed of an edge projecting inward in the radial direction is integrated with the outer sheath 1 by thermoforming. Since the locking contact portion 11 is configured in a bowl shape, the distal end opening 10 of the outer tube 1 formed at the center of the locking contact portion 11 is smaller than the inner diameter of the outer tube 1. The tip opening 10 has a diameter larger than the outer diameter of the needle body 3 by about 0.05 mm to 0.3 mm.
[0014]
Further, a stepped cylindrical locking member 14 having a large diameter portion 12 and a small diameter portion 13 is fixed to the outer periphery of the needle body 3 by so-called caulking (caulking by tightening from two to four directions). ing.
[0015]
In this case, the outer diameter of the large-diameter portion 12 is smaller than the inner diameter of the outer tube 1 and larger than the diameter of the distal end opening 10, and the inner tube 2 with respect to the outer tube 1 is operated by the operation portion 4. When the tip of the needle body 3 is projected from the distal end opening 10 of the outer tube 1, the distal end surface of the locking member 14 abuts against the inner end surface of the locking contact portion 11 of the outer tube 1 and advances further. A means for regulating so as not to be configured is configured.
[0016]
The small-diameter portion 13 of the locking member 14 has an inner diameter substantially equal to the inner diameter of the inner tube 2, and the distal end portion of the inner tube 2 is tightly fitted on the outer circumference of the small-diameter portion 13, The part is fixed by an adhesive 15. In this case, the locking member 14 is a member that fills the clearance between the outer diameter (outer circumference) of the needle body 3 and the inner diameter (inner circumference) of the inner tube 2, and connects the inner tube 2 and the needle body 3 through the clearance. .
[0017]
The adhesive 15 is applied so as to cover a part of the outer peripheral surface of the needle body 3 beyond the base end surface of the locking member 14, and simultaneously with the adhesive bonding between the inner tube 2 and the locking member 14, Watertightness between the locking members 14 is also ensured.
[0018]
As shown in FIG. 3, the stainless steel pipe 7 is fixed to the tip side portion of the base unit 9 by insert molding. Further, two protrusions 16 facing sideways are formed at the base end of the base unit 9. As shown in FIG. 5, four ribs 18 that fit and slide with the four grooves 17 formed in the main body 6 are provided at the distal end portion of the base unit 9. Two claws 19 as shown in FIG. 3 are arranged at the tip.
[0019]
Further, a notch 20 is provided inside the claw 19 so that the claw 19 is elastically narrowed. The height L1 (see FIG. 3) of the claw 19 is larger than the height L2 (see FIG. 5) of the two opposing grooves 17 of the main body 6, and the claw 19 is elastically deformed by using the notch 20 described above. It can be pushed into the body 6.
[0020]
Further, when the base unit 9 is pushed into the main body 6, the claw 19 is aligned with the two slits 22 of the main body 6 shown in FIGS. 3 and 4 and functions as a slide guide for the main body 6 and the base unit 9. The claw 19 is restricted so as to be located only in the slit 22. For this reason, it functions also as a locking means for preventing the base unit 9 from falling off the main body 6.
[0021]
The two ribs 18 of the base unit 9 are provided with hemispherical convex portions 23 located in the vicinity of the claws 19. As shown in FIG. 3A, in a state where the base unit 9 is fully pulled with respect to the main body 6, the convex portion 23 seems to be caught on the lumen end engaging portion 24 of the main body 6 with a light force. It has become. The main body 6 described above has a finger hook portion 25 on the proximal end side.
[0022]
In addition, a fixing portion 26 having a height higher than that of the ribs 18 is formed at the base ends of the four ribs 18. When the base unit 9 is pushed into the main body 6 to the maximum, the fixing portion 26 becomes the main body. The inner diameter of the engaging portion 24 is made slightly smaller than the height of the fixing portion 26 so as to be engaged with and fixed to the six engaging portions 24.
[0023]
(Function)
The base unit 9 is pulled away from the main body 6 so that the needle body 3 is accommodated in the outer tube 1 (the state shown in FIG. 1, FIG. 2 and FIG. 3 (a)). The outer tube 1 is inserted into the forceps channel of the endoscope inserted into the body cavity, and the distal end portion of the outer tube 1 is projected from the distal end of the endoscope into the body cavity.
[0024]
Next, the base unit 9 is pushed into the main body 6, the engaging portion 24 of the main body 6 and the fixing portion 26 of the base unit 9 are engaged and fixed, and the needle body 3 protrudes from the tip of the outer tube 1. It fixes in a state (state shown in (b) of each figure of Drawing 1, Drawing 2 and Drawing 3). In this protruding state, the hand of the outer tube 1 protruding from the hand of the endoscopic forceps channel is pushed in, the needle body 3 is punctured into the target tissue, and a medicine or the like is delivered with a syringe previously attached to the base 8. Delivered, injected into tissue, and treated.
[0025]
(effect)
By providing the locking member 14 with the small-diameter portion 13 substantially equal to the inner diameter of the inner tube 2, the inner tube 2 having the largest inner diameter can be shared among products having different needle diameters, so that the performance is not degraded. It is possible to provide inexpensive products.
[0026]
By fixing the locking member 14 to the needle body 3, automatic production by a machine can be performed, and it can be manufactured at a much lower cost than a structure in which it is necessary to rely on manual work such as bonding. Become.
[0027]
By providing the base unit 9 with a hemispherical convex portion 23 and fixing the base unit 9 to the engaging portion 24 of the main body 6 while being pulled to the maximum with respect to the main body 6, It is possible to prevent the needle body 3 from protruding inadvertently.
[0028]
The needle tip 5 of the needle body 3 is generally cut obliquely at an angle of about 15 °. By making this an angle of about 30 ° (for example, 25 ° to 40 °), the needle The length from the tip of the opening portion at the tip is shortened. For this reason, there is an effect that there is no liquid leakage from the needle tip 5 even when the needle is pierced shallowly into the tissue.
[0029]
Further, by providing the notch 20 at the tip of the base unit 9, the base unit 9 and the main body 6 can be easily assembled using the elasticity of the notch 20.
[0030]
When the material of the base unit 9 is made of polypropylene or the like that easily contracts during molding, a gap may be formed between the outer periphery of the pipe 7 and the resin even if the pipe 7 is insert-molded, and liquid leakage may occur. Therefore, as in this embodiment, liquid leakage can be prevented by using ABS or the like that does not easily shrink during molding.
[0031]
By providing the two protrusions 16 facing sideways at the base end of the base unit 9, when screwing the syringe into the base 8, the base unit 9 can be easily held and the syringe can be easily attached.
[0032]
By providing the finger-hook portion 25 on the main body 6, the main body 6 can be reliably held when the needle body 3 is protruded.
[0033]
As described in the section of the above action, in order to puncture the needle body 3 into the tissue, it is performed by pushing the outer tube 1 into the endoscope channel. The pushing force is not transmitted to the needle body 3, and the puncture property is deteriorated. Even if the outer tube 1 is hard, if the inner tube 2 is soft, the inner tube 2 is pushed back into the outer tube 1 at the time of puncturing, so that the inner and outer tubes 1 and 2 are hardened with good balance. Therefore, the inner and outer diameter dimensions of the inner and outer tubes 1 and 2 shown in the above embodiment are suitable dimensions.
[0034]
In addition, this invention is not limited to the thing of embodiment mentioned above. According to the description of the above embodiment, at least the matters listed below and the matters of arbitrary combinations thereof can be obtained.
[0035]
<Appendix>
1. In an endoscope injection needle comprising an inner / outer tube that can be moved forward and backward, a needle attached to the tip of the inner tube, and an operation unit that performs the forward / backward operation of the inner / outer tube, the outer diameter of the needle body and the inner diameter of the inner tube An injection needle for an endoscope, wherein the inner tube and the needle body are connected via a member filling the clearance.
[0036]
2. An injection needle for an endoscope, characterized in that the distal end of the outer tube is recessed so that the distal end opening of the outer tube of item 1 is smaller than the lumen of the outer tube.
[0037]
3. An endoscope injection needle characterized in that stopper means having an outer diameter larger than that of the distal end opening of the outer tube according to item 2 is provided on the outer periphery of the needle body.
[0038]
4). 3. The endoscope injection needle according to claim 3, wherein the stopper means is a cylindrical member.
[0039]
5). 5. The endoscope injection needle according to claim 4, wherein a member that fills the clearance is provided integrally with a stopper means.
[0040]
6). The endoscope needle according to claim 5, wherein a small diameter portion having an outer diameter substantially the same as the inner diameter of the inner tube is provided at the proximal end of the stopper means.
[0041]
7). The endoscope needle according to Item 6, wherein the stopper means and the needle body are connected by caulking the stopper means from the outer periphery.
[0042]
8). In the endoscope injection needle according to Item 7, the small diameter portion of the stopper means and the inner tube are connected by an adhesive, and at the same time as the application of the adhesive, the proximal end of the stopper means and the needle body are connected. An endoscope injection needle characterized in that an adhesive is applied to fill the gap.
[0043]
【The invention's effect】
As described above, according to the present invention, by connecting the inner tube and the needle body through the member that fills the clearance between the outer diameter of the needle body and the inner diameter of the inner tube, the inner tube having the largest inner diameter is connected to the needle diameter. Can be shared between different products and can be easily connected, so that it is possible to provide an inexpensive product without reducing the liquid feeding performance of the inner tube.
[Brief description of the drawings]
FIG. 1 is an external view of an entire endoscope injection needle according to an embodiment of the present invention, in which (a) shows a state in which the needle is housed in an outer tube, and (b) shows an outer tube. It is a state in which the needle protrudes from the tip of the needle.
2 is a longitudinal sectional view of the vicinity of a distal end portion of an endoscope injection needle according to the embodiment, FIG. 2 (a) shows a state in which the needle is housed in an outer tube, and FIG. The needle protrudes from the tip of the tube.
FIG. 3 is a longitudinal sectional view of the vicinity of the proximal end portion of the endoscope injection needle according to the embodiment, where (a) shows a state in which the needle is housed in an outer tube, and (b) shows The needle protrudes from the tip of the outer tube.
4 is a longitudinal sectional view of a portion along the line AA in FIG. 1. FIG.
5 is a longitudinal sectional view of a portion along the line BB in FIG. 1. FIG.
FIG. 6 is a view of the endoscope injection needle as seen from the proximal end side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Outer tube, 2 ... Inner tube, 3 ... Needle body, 4 ... Operation part, 5 ... Needle tip,
9 ... base unit, 10 ... tip opening, 11 ... contact portion for locking, 12 ... large diameter portion,
13 ... small diameter part, 14 ... locking member.

Claims (1)

An outer tube,
An inner tube inserted into the outer tube so as to freely advance and retract;
An operation part for performing the advance / retreat operation of the inner and outer tubes;
A needle attached to the tip of the inner tube;
A member that fills a clearance caused by a difference between an outer diameter of the needle body and an inner diameter of the inner tube and connects the inner tube and the needle body;
Comprising
The needle body has a portion extending to the proximal end side of the inner tube beyond the proximal end surface of the member and extending from the outer periphery of the member to a position covering the proximal end of the member. An injection needle for an endoscope, wherein the inner tube and the needle body are connected by bonding the member and the needle body to the inner tube in the inner tube .

Images