JP4296759B2 - Endoscopic needle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope injection needle that inserts an injection needle into a body cavity via an endoscope and injects a drug solution or the like into an affected area.
[0002]
[Prior art]
In order to inject a drug solution or the like into an affected area in a body cavity, it is known to insert an injection needle through a forceps port of an endoscope, puncture the affected area, and inject a drug. Such an injection needle includes an inner tube catheter having a lumen in which a needle is fixed and a drug solution flows, an outer tube catheter that can be inserted in the lumen and moved back and forth in the longitudinal direction of the catheter, and the needle It consists of an operation part for projecting the tip from the distal end of the outer tube catheter, a stopper fixed to the distal end of the outer tube catheter to determine the position of the projected needle, and a proximal end for projecting the needle tip from the distal end of the outer tube catheter The needle protrudes from the distal end of the outer tube catheter by pushing the inner tube catheter in the longitudinal direction of the outer tube catheter at the operation section on the side. In addition, since the base of the needle abuts against the stopper at the distal end of the outer cylinder, the needle tip does not protrude any further, so that an accurate protrusion length is determined. Furthermore, since the inner tube catheter that has struck the stopper firmly is pushed from the operating portion toward the stopper, there is little return of the needle tip even when puncturing.
[0003]
However, since this type of endoscope injection needle has a fixed length of protruding needle tip, if you want to change the part to be used or change the protruding length of the needle tip immediately depending on the patient's condition, There is a problem that an endoscope injection needle having a protruding length of 5 mm must be newly prepared. In addition, there is a problem that the number of stocks increases because it is necessary to prepare endoscope needles with many different projecting lengths based on the site to be used and the condition of the patient as described above.
[0004]
In order to solve the above-mentioned problems, a mechanism for adjusting the length of the inner cylinder is provided at the operation portion located at the end of the catheter, and after setting a certain protrusion length as the operation portion, the needle tip protrudes. There are several types of catheters. This type has a structure in which the protruding length of the needle tip from the distal end of the outer tube catheter is lengthened or shortened by setting at the operation unit as described above. The structure that abuts the base of the needle against the stopper attached to the tip cannot be taken. For this reason, when the needle is punctured, the needle is fixed to the inner cylinder, and if the inner cylinder catheter itself is not waisted, the catheter is pushed back by the reaction of the puncture force, and the needle at the distal end of the inner cylinder catheter is also pushed back. There is a problem that it is difficult to understand the sense of puncturing the puncture site.
[0005]
In the structure in which the inner tube catheter and the outer tube catheter are combined, the needle is obtained by moving the inner tube catheter back and forth in the longitudinal direction of the outer tube catheter at the outer diameter portion of the inner tube catheter and the inner diameter portion of the outer tube catheter. A clearance is provided for projecting. In actual use, since the catheter is inserted from the forceps port into the curved endoscope, there is clearance of the catheter at the curved portion of the endoscope. Since it is curved along the outer peripheral side of the inner diameter of the tubular catheter (the large arc side of the curved endoscope) and both ends of the inner tubular catheter are pulled by the curved portion, it is attached to the distal end of the inner tubular catheter. Since the tip of the needle is pulled in the same manner, there is a problem that the protruding length is shortened. Therefore, although this clearance is narrowed, the dimensional tolerance of the inner and outer diameters of the catheter or the contact area between the inner tube catheter and the outer tube catheter is increased by narrowing the clearance. However, there is a problem that it is difficult to move back and forth in the longitudinal direction of the catheter.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to solve such a problem, and it is easy to operate, in which a needle tip does not return, and a medical solution or the like is injected into an affected part in a body cavity through an endoscope with high projection accuracy. An endoscope needle is provided.
[0007]
[Means for Solving the Problems]
That is, the present invention is fixed to the catheter (1), the first lumen for feeding the catheter (1) tip of the drug solution (2) having flexibility with a first lumen for feeding (2) the chemical needle (3), a protective cover for covering the needle (3) (5), the operation unit for back and forth in the longitudinal direction of the protective cover (5) of the catheter (1) to (6), and said operating unit (6) An endoscope injection needle comprising a protruding length determining grip (8) for fixing a position , wherein the catheter (1) further has a second lumen (4) , and the second lumen (4 ) member having flexibility is inserted into, one of the members having the flexible is fixed to the operating part (6), with the other one is fixed to the protective cover (5), wherein A protrusion (10) is provided on the outer periphery of the operation portion (6), and the protrusion length determination grip (8 That on the outer periphery of which is provided with a groove (12) in the radial direction for setting the projection length in a part of the groove the projections (10) back and forth in the longitudinal direction (11), and said groove (11) An endoscope needle for use as a feature.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an endoscope injection needle according to an embodiment of the present invention.
FIG. 1 shows an embodiment of an endoscope injection needle according to the present invention. The endoscope injection needle passes through the lumen of the catheter (1) having two lumens, the needle (3) attached to the first lumen (2) and the second lumen (4), and the distal end side is a protective cover (5). A flexible wire (7) fixed to the operating portion (6) at the proximal end side, and a protective cover that changes the protruding length of the needle by moving back and forth in the longitudinal direction of the catheter while protecting the needle tip 5), an operation section (6) for operating the protective cover on the proximal end side, a protrusion length determination grip (8) having a groove for setting the protrusion length, and a connector (9) for connecting a syringe for injecting a chemical solution Consists of
[0009]
As a method of operating the protrusion length, the tip cover is usually fixed at a position covering the needle tip, and the protrusion length determination grip (8) has a groove (11) corresponding to the position of the protrusion length in the longitudinal direction and the radial direction. In order to insert the projection (10) attached to the operation portion (6) into the groove (11), the operation portion (6) is inserted into the projection length determining grip (8) lumen. The protrusion length of the needle tip is adjusted by aligning the protrusion (10) of the operation portion with the radial groove (12) corresponding to each set protrusion length. At this time, since the wire (7) fixed to the operation unit (6) also moves in the same manner as the operation unit, the protective cover (5) fixed to the wire also follows and the projection length is determined. Then, a medicine or the like is injected into the affected part by a syringe (not shown) attached to the connector (9) located at the end of the operation part (6).
[0010]
After setting the protrusion length, the needle is inserted into the affected area, but the conventional endoscope injection needle composed of two catheters, the inner tube and the outer tube, has a needle fixed to the inner tube catheter. In addition, since there is a clearance between the inner tube catheter and the outer tube catheter, in the present invention, the outer diameter of the catheter (1) is the same as that of the outer tube catheter because it is composed of one catheter (1). Since the diameter can be increased, the waist is strong and the return of the needle when punctured is less than that of a catheter having a conventional inner and outer tube. Further, since the wire (7) is passed through the second lumen (4), the dimensional tolerance of the outer diameter of the wire is higher than that of the catheter, and the contact area between the wire and the second lumen (4) is as follows. Since the contact area of the catheter is small, the problem of shortening the protrusion length even in a curved endoscope is less than that of a catheter having a conventional inner and outer cylinders, so high protrusion accuracy is obtained and smooth protrusion adjustment is achieved. Is possible.
[0011]
The catheter (1) needs to be strong and has a high elastic modulus, and after the puncture, the catheter must be transparent because blood must flow back through the catheter through the catheter. The catheter is inserted from the forceps port of the endoscope and protruded from the distal end of the endoscope. In the second lumen (4) of the catheter in which the wire (7) is inserted, the length of the catheter is adjusted in order to adjust the protruding length. A material with good slippage is preferable because the wire moves back and forth. Polytetrafluoroethylene resin (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP), polyamide-based elastomer, soft polyvinyl chloride resin (PVC), polyurethane A synthetic resin such as (PU) is preferred. Also, the outer diameter of the catheter is inserted through the forceps port of the endoscope, and is used for suction and air supply from the clearance between the forceps port and the catheter. Therefore, the outer diameter of the catheter is about 0.2 to 1.0 mm. A thin outer diameter is preferred.
[0012]
The inner diameter of the second lumen (4) through which the wire (7) passes may be determined according to the outer diameter of the catheter, but is preferably 0.3 to 0.8 mm, and the wire inserted into the second lumen The outer diameter is preferably a wire outer diameter that is about 0.05 to 0.3 mm thinner than the lumen diameter.
[0013]
The wire (7) is used by being inserted into the second lumen (4) of the catheter, and considering that the catheter is inserted into the curved portion of the endoscope, it is a flexible wire and the operation unit. Must be transmitted to the protective cover. Therefore, the material is preferably stainless steel or nickel titanium alloy. Further, a wire obtained by twisting two or more wires is more preferable than a single wire because it is less likely to bend and has flexibility.
[0014]
The first lumen (2) through which the chemical solution passes is preferably a large inner diameter in order to reduce the pushing resistance when the viscosity of the chemical solution is high, and is preferably 0.5 to 1.2 mm. In addition, as the needle (3) located at the tip of one lumen, the diameter of the needle tip may be appropriately selected depending on the puncture site and the procedure. Moreover, it is preferable that the length of the needle tip protruding from the protective cover (5) can be adjusted to 2 to 10 mm, and the protruding length may be appropriately selected depending on the puncture site or the procedure.
[0015]
The protrusion length determination grip (8) and the operation portion (6) for adjusting the protrusion length are a method of cutting the groove (11) as the adjustment of the protrusion length and determining the protrusion length by the interval between the radial grooves (12). Although illustrated, there is no limitation as long as the projection length can be accurately set, such as a method of attaching a screw or the like and rotating it to move the position back and forth to determine the projection length.
[0016]
The outer diameter of the protective cover (5) is preferably the same as or smaller than the outer diameter of the catheter (1), and has flexibility through the operation portion (6) through the second lumen (4) of the catheter. A hole for attaching the member by bonding or the like and a through-hole for passing the needle are provided. Further, since the distal end side of the protective cover is in close contact with the affected part at the time of puncturing, it is preferable that the outer peripheral portion on the distal end side is chamfered. As the material, since it is necessary to visually recognize that the needle tip punctures the puncture portion, a transparent material is preferable. Polytetrafluoroethylene resin (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP), Synthetic resins such as polyamide-based elastomer, soft polyvinyl chloride resin (PVC), polyurethane (PU), and polycarbonate (PC) are preferable.
[0017]
【The invention's effect】
The endoscope injection needle according to the present invention has good operability, and since there is no return of the needle tip, it can be punctured reliably and has a high protruding accuracy.
[Brief description of the drawings]
FIG. 1 is a diagram showing an endoscopic puncture needle according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Catheter 2 1st lumen 3 Needle 4 2nd lumen 5 Protective cover 6 Operation part 7 Wire 8 Protrusion length determination grip 9 Connector 10 Protrusion 11 Groove 12 Radial groove

Claims (1)

The catheter has a flexible having a first lumen (2) for feeding the liquid medicine (1), said catheter (1) a first lumen to feed the leading end of the drug solution (2) which is fixed to the needle (3) , needle (3) protective cover covering (5), the operation unit for back and forth in the longitudinal direction of the protective cover (5) the catheter (1) (6), and to fix the position of the operating unit (6) a endoscope needle composed of the protruding length determining grip (8) of the catheter (1) further comprises a second lumen (4), flexible in said second lumen (4) The flexible member is inserted, one of the flexible members is fixed to the operating portion (6) , the other is fixed to the protective cover (5), and the operating portion (6) A protrusion (10) is provided on the outer periphery of the protrusion, and the protrusion is determined on the outer periphery of the protrusion length determining grip (8). An endoscope characterized in that (10) is provided with a groove (11) moving back and forth in the longitudinal direction, and a radial groove (12) for setting a protruding length in a part of the groove (11). Needle.

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