JPH0119964Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an indwelling needle for infusing blood, medicinal solutions, etc. by inserting an inner needle into a patient's arm or the like.

As this type of indwelling needle, what is known as a winged indwelling needle as shown in FIGS. 1 and 2 has been known.

In the figure, the base of the large diameter portion 2a of the inner needle 2 is held in the inner needle base 1 made of transparent ABS resin or the like. The inner needle 2 is made of metal and has a hollow pipe shape, and has a large diameter portion 2a and a small diameter portion 2b. The tip of the small diameter portion 2b is cut diagonally to form a slope 2c.
In the illustration, the opening 3 of the inner needle 2 is visible on the slope 2c. Note that the inner needle base 1 is provided with an infusion passage communicating with the hollow portion of the inner needle 2. Further, a holding member 4 made of transparent ABS resin or the like and having a hollow interior holds one end portion of a tube 5 made of transparent vinyl chloride or the like. The other end of the tube 5 is a transparent tube with a hollow interior.
It is fitted into a holding member 6 made of ABS resin or the like. One end of this holding member 6 is a soft member having a hollow interior and integrally molded wing bodies 7 and 8 on both sides.
It is fitted into a cylindrical body 9 made of PVC resin or the like.
One end of a thin tube 10 made of transparent Teflon or the like is fitted into this cylindrical body 9.

By fitting the protrusion 11 provided on the inner needle base 1 into the recess 12 provided on the holding member 4, the direction of the slope 2c of the inner needle 2 is determined, and the inner needle 2 is attached to the holding member 4. , the tube 5, the cylindrical body 9, and the tube 10, and the slope 2c at the tip thereof protrudes from the tip of the tube 10.

When using the winged indwelling needle having the above configuration, first, hold the inner needle base 1 with your fingers while holding the inner needle 2.
The tip of the blade is inserted into the patient's arm with the slope 2c facing upward, and the wings 7 and 8 are fixed to the patient's arm with adhesive tape or the like. Next, after removing the inner needle base 1 and the inner needle 2 from the holding member 4, an infusion tube is connected to the holding member 4. In this state, blood, medicine, etc. sent from the infusion tube can be sent into the patient's body through the tubes 5 and 10.

Therefore, when inserting the inner needle 2 into the patient's body, the indwelling needle must be inserted with the slope 2c of the distal end facing upward. When inserting the inner needle 2, the tube 5 and the holding member 6 are fitted together in a slippery state, so the tube 5 easily rotates together with the holding member 4. When the holding member 4 rotates, this rotation is transmitted to the inner needle base 1 and the inner needle 2 through the fitting between the projection 11 and the recess 12, and the inner needle 2 ends up rotating. That is, when the tube 5 rotates with respect to the holding member 6 fixed to the arm, the holding member 4, the inner needle base 1, and the inner needle 2 all rotate together. As described above, in the conventional winged indwelling needle, the inner needle 2 easily rotates, making it difficult to insert the inner needle 2 into the patient's body in a predetermined direction.

The present invention solves the above problems, and embodiments of the present invention will be described below with reference to FIGS. 3 and 4. In FIGS. 3 and 4, the same members and parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and their explanations will be omitted.

In this embodiment, a stepped portion 2d is provided by chamfering a portion of the circumferential surface of the distal end of the large diameter portion 2a of the inner needle 2. The flat surface 2e formed by chamfering the stepped portion 2d is finished as a rough surface with fine irregularities and the like. At the same time, one end of the tube 5 is fitted into the insertion hole 15 of the holding member 6, and a part of the large diameter portion 2a is fitted therein. A flat surface 16a is formed by chamfering on a part of the inner peripheral surface of the insertion hole 16 into which the flat surface 2e of the holding member 6 is fitted. By fitting the large diameter portion 2a into the insertion hole 16 so that this plane 16a and the plane 2e are in contact with each other, the rotation of the large diameter portion 2a inside the holding member 6 is prevented. There is. When the protrusion 11 and the recess 12 are fitted together, the flat surface 16a and the flat surface 2e are in contact with each other, and the slope 2c of the tip of the inner needle 2 is directed upward. In addition, the above-mentioned plane 2e and the small diameter portion 2b
It is consistent with the aspects of That is, the length from the plane 2e to the center of the large diameter portion 2a and the small diameter portion 2b is equal to the radius of the small diameter portion 2b.

As described above, in the indwelling needle according to the present invention, the distal end of the large diameter portion of the inner needle is chamfered, and a part of the insertion hole of the holding member through which the distal end is fitted and inserted is chamfered. The large diameter portion is inserted into the insertion hole so that the processed portion and the chamfered portion of the large diameter portion come into contact with each other.

Therefore, according to the present invention, the tip of the inner needle can be easily positioned in a predetermined direction when the inner needle is inserted into the body, and once positioned, the inner needle does not rotate. This posture can be maintained. Therefore, compared to conventional indwelling needles, the insertion operation can be performed more easily, and safe infusion can be performed.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional indwelling needle, Fig. 2 is an external perspective view of a conventional indwelling needle, Fig. 3 is a partial cross-sectional perspective view of the main part showing an embodiment of the present invention, and Fig. 4 is an exploded perspective view of a conventional indwelling needle. FIG. 1 is a cross-sectional side view showing an embodiment of the present invention. In addition, in the symbols used in the drawings, 2...inner needle,
2a...Large diameter portion, 2b...Small diameter portion, 2d...Stepped portion, 2e...Flat surface, 6...Holding member, 16...Through hole, 16a...Flat surface.

Claims (1)

[Scope of utility model registration request] It has an inner needle in which a pipe-shaped small diameter part is integrally extended from the tip of a pipe-shaped large diameter part,
In the indwelling needle, the tip of the small diameter portion is inserted into the body to administer infusions, and the tip of the large diameter portion is provided with a stepped portion by chamfering and an insertion hole into which the tip is fitted. A holding member is provided, a part of the insertion hole is chamfered, and the large diameter portion is fitted into the insertion hole so that the chamfered portion and the chamfered portion of the large diameter portion are in contact with each other. An indwelling needle characterized in that the inner needle is prevented from rotating by being inserted therethrough.