JPH0513668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a synthetic resin introduction needle used when introducing and indwelling a rod-shaped medical device such as a catheter or guide wire into a blood vessel or the like.

(Prior Art) Conventionally, a flexible introduction needle made of synthetic resin has been used, for example, when introducing and indwelling a catheter into a blood vessel. That is, as shown in FIG. 8, the introduction needle (the same applies hereinafter) 1 is inserted into the inner needle 3 of the syringe 2 with the tip of the inner needle 3 protruding, and then the introduction needle 1 is inserted as shown in FIG. The inner needle 3 is inserted into the blood vessel 4 until the tip of the inner needle 1 is inserted into the blood vessel 4. Next, as shown in FIG. 9, the inner needle 3 is removed from the blood vessel 4 while the introduction needle 1 is kept in that state. With the introduction needle 1 secured in the blood vessel 4 in this way, the desired catheter 5 is inserted as shown in FIG.
is inserted into the introduction needle 1, and its distal end is inserted into the blood vessel 4. In this way, the catheter 5
After indwelling the catheter at a predetermined position within the blood vessel 4, it is desirable to remove the unnecessary introduction needle 1 from the blood vessel 4 and also from the catheter 5. This is because it is not sanitary to leave the unnecessary introduction needle 1 removed from the blood vessel 4, and it also interferes with subsequent operations.

However, it is impossible to withdraw the introduction needle 1 from the catheter 5 due to the presence of an enlarged part, such as the connector 6 of the catheter.

Therefore, several proposals have been made for removing the introduction needle 1 that is no longer needed from the catheter 5. For example, Japanese Patent Application Laid-Open No. 56-11069 discloses that a pair of strips made of a plastic different from the other parts are formed at radially opposite parts of the introduction needle, and the base of the introduction needle is covered with strips. The fitting part is connected to the inner needle hub which has a slit connected to the inner needle hub, and the unnecessary introduction needle is divided into two by tearing it from the lever strip having the fitting part. A new version has also been proposed.

(Problems to be Solved by the Invention) However, in the conventional method of dividing the introduction needle by providing a strip as described above, when the strip is removed from the introduction needle body, the color of the strip is Since the color of the strip is similar to that of the introducing needle body, it is difficult to immediately confirm the position of the strip, and there are problems such as the time-consuming operation of dividing the introducing needle.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention colors at least the strip that is to be peeled off, and colors the other part of the hollow tube constituting the introduction needle. On the other hand, the strips can be clearly distinguished by color.

That is, the present invention relates to a medical device introduction needle for introducing a rod-shaped medical device into a living body, which comprises a hollow tubular body made of synthetic resin into which the rod-shaped medical device can be inserted, and the entire length of the tubular body in the longitudinal direction is or at least a portion of the hollow tube over the entire length in the longitudinal direction excluding the tip is made of a different material from other parts of the hollow tube,
The present invention also provides a needle for introducing a medical device, characterized in that the needle is colored in a color clearly different from the other portions.

In this specification, "at least a part of the hollow tube constituting the needle for introducing a medical device is colored in a color clearly different from the other part of the hollow tube" means When the other parts of the hollow tube are substantially the same color as the synthetic resin itself, and at least a part of the hollow tube mentioned above is colored in a chromatic color or a deep achromatic color. , when these are colored so that there is a significant difference in brightness, or when they are colored so that they are opposite colors, etc.

(Example) First, the present invention will be described with reference to an example shown in FIGS. 1 to 6. FIG. 1 is a perspective view of a medical device introduction needle 11 according to the present invention, and shows a first
and a second material, and is formed into a substantially tube shape with the strip portion 12 remaining.
As shown in FIGS. 1 and 2, a second strip made of a third material and colored in a chromatic color is formed along the longitudinal direction of the medical device introduction needle 11. It consists of a strip body 14. Note that this introduction needle 11 is made by simultaneously molding portions with different diameters by extrusion molding with different diameters.

As the first material, for example, a polyolefin resin such as high density polyethylene, polypropylene, or ethylene-propylene copolymer is used. The second material is one that can form a blend polymer with the first material and has good adhesion with the third material described below, that is,
When introduced into the body, the first strip and the second strip of the introduction needle are
The adhesive surface of the strip does not separate and has adhesive properties that allow smooth introduction without blood leakage. As such, for example, olefin resins such as high density polyethylene, polypropylene, and ethylene-propylene copolymers modified with maleic acid or the like are used. Furthermore, the second
It is preferable to select a material whose base polymer is the same as that of the first material. The third material has substantially no adhesiveness to the first material, that is, it weakens the adhesiveness to the second material and connects the first strip of the introduction needle with the third material. The adhesive surface of the two strips can be separated by a predetermined force, and the material has good adhesion to the second material, such as 6-nylon, 6,6-nylon,
Polyamide resins such as 11-nylon and polyester resins such as polyethylene terephthalate and polybutylene terephthalate are used.

In addition, the first material is selected from polypropylene, polyethylene, and ethylene vinyl acetate, and the second and third materials are both selected from polypropylene, polyethylene, and ethylene vinyl acetate, and the first material and You may choose one that is incompatible.

As the material, synthetic resin is preferable from the viewpoint of processability, etc., but any material can be used as long as it satisfies the above-mentioned conditions.

In this way, the first strip body 13 and the second strip body 1
4, the adhesion or releasability between them will depend on the type of the second material and the blending ratio with the first material. By appropriately adjusting the shape and thickness of these strips 13 and 14,
The adhesiveness and peelability between the first strip 13 and the second strip 14 can be freely adjusted to desired strength.

For example, if a polyolefin resin is used as the first material, a maleic acid-modified polyolefin resin is used as the second material, and a polyamide resin or polyester resin is used as the third material, the combination of the first material and the second material is The ratio is adjusted in the range of 10:1 to 2:1, more preferably 6:1 to 3:1.

Furthermore, when a blend polymer of ethylene vinyl acetate copolymer and polypropylene is used as the first and second materials and polypropylene is used as the third material, the ethylene vinyl acetate copolymer:polypropylene ratio is preferably 1:11:5. It can be adjusted within a range, more preferably within a range of 1:3 to 1:5. When the blending ratio is in the range of 1:1 to 1:5, products with good moldability and appropriate divisibility can be obtained. In other words, when the ethylene vinyl acetate copolymer is 1, the proportion of polypropylene is 1.
When it is less than 1, the strength of the divided part becomes weak and problems such as blood leakage occur when introducing the catheter.
On the other hand, when the ratio of polypropylene exceeds 5 when the ethylene vinyl acetate copolymer is 1, it becomes difficult to divide and the operability becomes poor.

As the coloring agent for coloring the second strip 14, any dye or pigment can be used as long as it does not have an adverse effect on the human body. There are no particular restrictions on the color of the colorant, and it can be selected as appropriate depending on the type of product.

The medical device introduction needle 11 is manufactured using, for example, an extruder as shown in FIG. That is, this extruder includes a first extrusion device 22 having an annular die 21 at its tip, and a nozzle 23 that opens in the middle of the molten resin passage upstream of the die 21.
It consists of a second extrusion device 24 equipped with a. These first and second extrusion devices 22,2
4 at the same time, a colored second strip 14 as shown in FIG.
The tube embedded in the slit portion 12 can be taken out from the die 21. The cross-sectional shape of the strip 14 corresponds to the discharge rate ratio of the extrusion devices 22 and 24 and the cross-sectional shape of the opening of the nozzle 23, so it can be arbitrarily selected as required.

Next, a method of using the medical device introduction needle of the present invention will be explained.

First, the introduction needle 11 is inserted into a syringe as shown in FIG. 8 in the same manner as shown in FIGS. 8 to 10, and then the inner needle is inserted into a blood vessel etc. is removed, the introduction needle 11 is secured in a blood vessel, etc., and then a catheter or the like is inserted into this introduction needle 11, and the catheter or the like is introduced into the blood vessel or the like.

Next, when removing the unnecessary introduction needle 11 from the catheter or the like, pinch the second strip 14 portion with the colored second strip 14 facing upward as shown in FIG. By pulling this upward as shown in FIG.
2, the introduction needle 11 can be easily removed from the catheter 15. In this case, the peeling operation of the second strip 14 is performed when the first strip 13 is substantially the color of the resin itself (for example, pale white) and the second strip 14 is Since it is colored, the position of the second strip 14 can be immediately confirmed, and the second strip 14 can be quickly peeled off.

In addition, in the above embodiment, a case was explained in which a catheter was introduced as a needle for introducing a medical device.
Needless to say, the present invention is applicable not only to catheters but also to the introduction of all kinds of rod-shaped medical devices into the human body.

The second strip 14 is not limited to the one provided on the introduction needle 11 as in the above embodiment, but may be provided with two or more strips in the radial direction as shown in FIG. The relationship between the width of the first strip 13 and the width of the second strip 14 is not limited to the illustrated example and can be selected as appropriate.

Furthermore, in the above embodiment, a case was explained in which the first, second and third materials were used to adjust the peelability between the first strip and the second strip. The material of the first strip and the second strip may be simply made of a single different material, and the releasability between them may be adjusted. In addition, as shown in Figure 7, there is a weld line 1 inside one of the strips that is easy to peel along the longitudinal direction.
6 may be formed, and the medical device introduction needle may be divided via this weld line 16.
This weld line 16 is formed by providing a diagonal plate (not shown) in the molding resin flow path near the discharge port of the die 21 in the molding apparatus shown in FIG. 5 to substantially divide the resin flow. It can be formed by molding. When the weld line 16 is formed in this manner, the coloring density naturally increases at this weld line portion due to light reflection, etc., and the position of the weld line 16 can be easily confirmed.

(Effects of the Invention) As described in detail above, according to the present invention, a long band is formed in a part of the hollow tube constituting the main body of the needle for introducing a medical device, and the band In the needle for introducing a medical device in which the hollow tube body is divided through the needle, at least this band part is colored in a color clearly different from other parts. It becomes easy to confirm the position of the strip portion, and this division or dividing operation can be performed more reliably and quickly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a needle for introducing a medical device according to the present invention, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1,
3 and 4 are perspective views illustrating the operation of peeling the strip from the introduction needle, FIG. 5 is a sectional view showing an example of the manufacturing apparatus for the medical device introduction needle of the present invention, and FIG. 6 and FIG. 7 are cross-sectional views of a needle for introducing a medical device according to another embodiment of the present invention, and FIGS.
The figure is a schematic diagram for explaining how the needle for introducing a medical device is used. DESCRIPTION OF SYMBOLS 1... needle for introduction, 2... syringe, 3... inner needle, 4... blood vessel, 5... catheter, 6... connector, 11... needle for medical device introduction, 12... slit part, 13... ...First strip, 14...Second strip, 15...Catheter, 16...Weld line, 21...Dice, 22...First extrusion device, 23...Nozzle, 24... ...Second extrusion device.

Claims (1)

[Scope of Claims] 1. A medical device introduction needle for introducing a rod-shaped medical device into a living body, which is made of a hollow tubular body made of synthetic resin into which the rod-shaped medical device can be inserted, and which has a longitudinal axis of the tubular body. At least a part of the hollow tube is made of a material different from other parts of the hollow tube over the entire length in the direction or the entire length in the longitudinal direction excluding the tip, and is colorally distinct from the other parts. A needle for introducing a medical device characterized by being colored in different colors. 2. The hollow tube body consists of a plurality of strips integrally formed in a liquid-tight manner along the longitudinal direction, one of the strips being a molded body of a mixed material of a plurality of materials, and At least one material of the other strip that is in contact with the strip is made of a material that has substantially no adhesiveness to each other and a material that has good adhesiveness to each other; The needle for introducing a medical device according to claim 1, wherein the other strip is colored so that the strips are distinguished from each other by color. 3. The medical device introduction needle according to claim 1, wherein at least a portion of the hollow tube has a weld line approximately in the center of its width, which is joined with a relatively weak force.