JPH0725950Y2 - Medical needle tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a method for treating varicose vein diseases such as esophagus.
The present invention relates to a medical injection needle tube used for endoscopic sclerotherapy for stopping or preventing bleeding by locally injecting a drug solution into a varicose vein to cause thrombus.

[Conventional technology]

Conventionally, as an injection needle tube tool used for endoscopic sclerotherapy, a double tube structure of an inner tube and an outer tube, an inner tube has an injection needle at the tip and a grip portion having a connector function at the rear end, and an outer tube. Various types of tubes in which an inner tube is built in and which can slide forward and backward and have a grip portion at the rear end have been devised and provided to the operator.

These medical injection needle tubes are disclosed, for example, in Japanese Utility Model Application No. 62-16
As described in No. 2470, by advancing and retracting the inner tube holding part in the outer tube holding part and rotating and fixing it, the injection needle at the tip of the outer tube can be securely fixed in a protruding or housed state, and the desired It is characterized in that it can be fixed accurately by the amount of protrusion. Also, as in Japanese Utility Model Laid-Open No. 63-26351, there is no stopper mechanism that regulates the amount of injection needle projection at the tip of the outer tube, and the stroke of the inner tube gripping section that moves forward and backward into the outer tube gripping section is screwed. It is characterized in that the amount of protrusion of the injection needle can be adjusted by regulating it by using a strip mechanism.

With these conventional products, the operator can predict the depth from the mucosal surface to the varicose vein according to the degree of varicose veins, and freely adjust the protruding amount of the injection needle protruding from the tip of the outer tube as necessary. It is devised and devised so that the injection needle tip opening portion is inserted and positioned in the blood vessel of the aneurysm and the hardening agent is not injected into the extravascular mucosal tissue by selecting the method such as the above.

However, at the actual treatment site, a varicose vein swayed by the patient's body movements and respiratory movements is punctured, and
Since it is necessary to repeat this therapy several times to treat smaller blood vessels, there is often the problem that the needle tip will penetrate the blood vessels, and if you are not a skilled or surgeon,
It is difficult to accurately inject a drug solution into a blood vessel. Also,
Type of chemical used (eg ethanolamine oleate)
In some cases, when injected into mucosal tissues, there is a risk of causing serious devastation and necrosis, and causing serious medical malpractice such as perforation and infiltration of the esophageal wall and the like.

[Problems to be solved by the device]

In view of the above-mentioned drawbacks of conventional devices and the actual conditions at the treatment site, the present invention allows an operator to easily and safely perform selective injection of a medicinal solution into the blood vessel of a varicose vein, and at a low price. It is intended to provide a disposable medical needle tube.

[Means for Solving the Problems]

The present invention provides an inner tube having an injection needle at the front end and a grip portion having a connector function at the rear end, which communicates with the tube inner cavity, and an outer tube having an inner cavity capable of sliding the inner tube back and forth. A medical injection needle tube having a double-tube structure composed of, wherein an injection needle at the tip of the inner tube has a blade tip obliquely cut at an angle of 15 to 25 degrees, and a tip opening hole. In addition to the portion, the needle tube penetrates the side wall of the needle tube rearward of the start portion of the beveled surface in parallel to the beveled surface and leads to the lumen 2
The medical injection needle tube is characterized by having individual side openings.

Hereinafter, a medical injection needle tube according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a state in which the injection needle (1) at the tip is housed and fixed, and FIG. 2 is an overall view in a state in which the injection needle (1) is projected and fixed. An injection needle (1), an inner tube (2) connected to the injection needle (1) for conduction, and an outer tube having a tip stopper (3) for restricting the maximum protrusion amount of the injection needle (1) at the tip. (4), and the inner tube tube (2) and the outer tube tube (4) are connected to the inner tube handle (5) and the outer tube handle (6) at their rear ends, respectively. The tip of the inner tube handle (5) is connected and conducted to the inner tube (2) and is integrally conducted to the luer fitting connector part (7) of the terminal, and the injection tube is attached to the connector part (7). The structure is such that they can be fitted and connected to each other to inject a drug solution or the like into the injection needle (1), circulate the solution, and flow out to the varicose vein. The tip part of the outer tube handle (6) is connected to the outer tube tube (4) for conduction, and the injection needle (1), the inner tube tube (2) and the inner tube handle (5) are inserted from the rear end part, As shown in FIGS. 1 and 2, by driving the inner tube handle (5) back and forth from the outer tube handle (6), the injection needle (1) is moved to the tip stopper (3) at the tip of the outer tube (4). The structure is such that it can be protruded by the protrusion amount regulated by or can be housed in the outer tube (4). Moreover, the outer wall of the inner pipe handle (5) has a protrusion (8), and the outer pipe handle (6) has a handle groove (9) including the protrusion (8). The needle protrusion fixing position (10) at the front end of the groove (9) and the needle storage fixing position (11) at the rear are
A structure having a pocket into which the protrusion (8) is fitted and fixed by slightly rotating the inner tube handle (5), so that the injection needle (1) can be reliably fixed in a projected or housed state. Has become.

FIG. 3 is an enlarged view of the state where the injection needle (1) is projected and fixed at the tip of the outer tube (4). As shown in this figure, the injection needle (1) has an angle of 3 ° to 45 °, preferably 15 °.
Cutting edge that has a tip opening (1
3), and one or more side opening portions (12) that communicate with the inner wall of the injection needle (1) from the outer wall of the needle tube behind the beveled surface start portion (14). The side opening (12) may be opened in any direction with respect to the beveled surface of the cutting edge (13), but in the actual procedure, the beveled surface can be caught in the field of view of the endoscope and the varicose vein wall On the other hand, the injection needle (1) is often inserted in a direction in which the side opening part (2) is located on the back surface of the field of view of the endoscope, and the side opening part (12) is directly viewed. It is difficult to confirm that the is inserted under the mucous membrane. Therefore, it is preferable to make the direction of the side opening parallel to the beveled surface, and to form the side opening as a through hole for inexpensive manufacturing.

Generally, the outer tube (4) has an outer diameter of 0.5 to 5 mm,
Effective length 1 to 5M, injection needle (1) outer diameter 0.3 to 1.5mm
In the case of an esophageal varices, the inner diameter of 0.15 to 1.2 mm can be used.
Considering the properties of varicose veins, the viscosity of the drug solution used, etc., the outer tube (4) has an outer diameter of 1.5 to 3 mm and an effective length of 1.5 to 2
M, injection needle (1) has an outer diameter of 0.5 to 1.0 mm and an inner diameter of 0.25 to 1.0 mm
0.6mm, the amount of needle protrusion is preferably in the range of 3 to 6mm, and the side opening (12) is 0.3 to 1.5mm behind the beveled surface start (14) of the cutting edge (13). , Pore size 0.25 to 0.6m
A value of m is appropriate. The shape of the side opening portion (12) may be any of a circular shape, an oval shape, and a slit shape, but the circular shape is suitable for low cost and easy manufacturing.
As the material of the injection needle (1), stainless steel is used in the same way as a general-purpose medical injection needle from the viewpoints of chemical resistance, safety, and workability of the cutting edge (13).

The inner tube (2) and outer tube (4) have an effective length of 1
Considering the function of driving the injection needle (1) at the tip of the inner tube (2) back and forth by operating the handle at the rear end with a long double tube structure of up to 5M, the driving force is transmitted to the tip. It is required to have sufficient rigidity, hardness, and self-lubricating property as well as flexibility that does not easily bend. There is blood regurgitation in the inner tube (2) when it is punctured into a varicose vein, and it is clinically useful to confirm it under direct vision, and some degree of transparency is also preferred. Examples of such materials include fluororesins,
Thermoplastic resins such as polypropylene resin, polycarbonate resin and vinyl chloride resin are used. Although the manufacturing cost is high in consideration of durability in use, the outer tube (4) may be made of a metal spring tube processed by stainless steel or the like. The tip stopper (3) may be formed integrally with the outer tube (4) or may be combined with another component, but the strength is such that the stopper function is not impaired when the injection needle (1) is pressed by the projecting operation. Required. As such a material, a resin such as a fluororesin or a polypropylene resin, or a metal such as stainless steel is used.

With respect to the inner pipe handle (5), the outer pipe handle (6) and the connector portion (7), the protrusion portion (8) slides in the handle portion groove (9) by the handle operation, and the fixed position (10) or (11).
However, at that time, durability and strength are required so as not to cause scraping or damage. Further, since the lure of the injection cylinder is firmly fitted into the connector portion (7), it is required to have strength enough to prevent cracks and the like. As such a material, a thermoplastic resin such as an ABS resin or a polycarbonate resin is suitable in view of productivity.

In the above, the tip stopper (3) of the outer tube (4), the handle groove (9), the needle fixing positions (10), (11).
The example of the injection needle tube provided with the inner tube handle (5) and the protrusion (8) is described above, but the present invention is also applicable to an injection needle tube having a simple structure without them. Of course.

With a conventional injection needle tube, when a small-diameter varicose vein is punctured, it may be inserted through the blood vessel, and the open end of the injection needle may not be within the blood vessel and may be located behind the blood vessel. However, if the drug solution was injected without noticing it, the drug solution might be injected submucosally as a result. On the other hand, the injection needle tube of the present invention has side openings in the side wall of the needle tube in addition to the tip opening, and the drug solution injected from the handle side can flow out from a plurality of locations. Therefore, even when the needle tip penetrates the blood vessel, the outflow resistance in the blood vessel is lower than that in the mucous membrane, so that the drug solution is reliably injected into the blood vessel from any of the side openings located in the blood vessel. It will be. As a result, even an inexperienced operator can easily perform selective intravascular injection into a small blood vessel, which is extremely effective for the safety of the procedure and the prevention of medical malpractice.

Furthermore, in order to reduce bleeding at the insertion point when the needle is withdrawn after varicose vein puncture, the needle to be punctured should have a small diameter, but the hardening agent used is often a viscous drug solution. , In the conventional injection needle tube, it flows out only from the open end,
A high injection pressure is required, and the injection work needs to be injected in the shortest possible time in order to prevent excessive damage to the punctured mucous membrane, which requires a great deal of labor for the operator.
Being able to flow out from a plurality of places as in the present invention reduces injection resistance, which is effective in reducing labor and man-hours.

[Brief description of drawings]

FIGS. 1 and 2 are schematic views of an entire injection needle tube as an embodiment for explaining the present invention. FIG. 1 is a state in which a distal end injection needle is retracted and housed, and FIG. 2 is shown. The state which the injection needle protruded is shown. 3 is an enlarged view of the tip of the injection needle tube shown in FIG.

Claims (1)

[Scope of utility model registration request] 1. An inner tube having an injection needle at the tip and a handle having a connector function at the rear end that communicates with the tube lumen, and an outer tube having an lumen capable of sliding the inner tube back and forth. A medical injection needle tube having a double-tube structure composed of a tube, wherein the injection needle at the tip of the inner tube has a cutting edge that is beveled at an angle of 15 to 25 degrees, and has a tip opening. In addition to the hole part, the needle tube penetrates the side wall of the needle tube rearward of the start of the beveled surface parallel to the beveled surface and leads to the lumen 2
A medical injection needle tube having individual side openings.