JP3198492B2 - Indwelling needle with wing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winged indwelling needle, and more particularly, to a winged holding cylinder in order to prevent an erroneous puncture accident that has occurred when the indwelling needle is moved to the protector after use. The present invention relates to a winged indwelling needle which can be housed in a winged holding cylinder and protected by simply sliding the indwelling needle.

[0002]

2. Description of the Related Art Conventionally, a medical needle is generally separated from a protector which accommodates and protects the medical needle. Therefore, when the protector is used after the protector is used, the protector is held by the needle tip. There has been a so-called puncture accident in which a finger is punctured, and as a result, a medical worker may be infected with AIDS or hepatitis. Therefore, in order to eliminate such an accidental puncture accident, a protector having a pair of slits is integrally attached to the winged indwelling needle, and the winged indwelling needle is slid rearward along the protector slit after use. The needle tip can be stored and protected (US Pat. No. 5,120,32)
No. 0) or an indwelling needle and a winged protector, a required position regulating means is provided between the indwelling needle and the winged protector, and the needlepoint can be stored and protected by sliding the winged protector in the tip direction. (Japanese Patent Laid-Open No. 1-2
No. 12561) has been proposed.

However, the former US Pat.
Since the wing fixed to the needle is fixed to the patient's skin with a tape or the like in No. 0,320, it is impossible to store the needle in the protector while the needle is indwelled. Therefore, it is necessary to remove the tape and pull out the needle, slide it, and store it in the protector. Also, the latter disclosed in Japanese Patent Application Laid-Open No. 1-212561 discloses a method for puncturing a patient with a needle. Structural defects such as the needle moving backward due to the resistance at the time of piercing, or the needle falling out of the protector when the needle is moved backward to accommodate the needle tip in the winged protector. There was a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a wing with which a needle tip can be housed in a winged holding cylinder and protected by simply sliding the indwelling needle. It is intended to provide an indwelling needle. It is another object of the present invention to provide a winged indwelling needle capable of storing and protecting a needle tip in a winged holding cylinder while the wing is fixed to the skin.

[0005]

According to the present invention, there is provided a cannula having a cutting edge at a distal end, and a hub having a distal end and a proximal end and supporting the proximal end side of the cannula at the distal end side. And a tube connected to the proximal end of the hub, and having a distal end and a proximal end, flexible wings are provided on the distal outer wall thereof,
The hub comprises a holding tube that accommodates and holds the hub therein, and the hub is such that the distal end of the cannula is accommodated in the holding tube from a first position where the cannula projects a predetermined length from the distal end of the holding tube. 2 is slidable along the inner wall of the holding cylinder to a position 2 ;
Prevents movement in the second position direction when in the first position
First engaging means for engaging the first position when in the second position;
Interlock comprising second engagement means for preventing movement in the mounting direction
Engaging means is provided, wherein the first engaging means is provided with a guide groove of the hub.
Due to the flexibility of the hub forming material provided more proximally,
Male engaging part that can be easily bent inside and holding cylinder
From the female engaging portion provided on the base end side of the engaging projection.
The female engaging portion is bent inward to
So that the engagement state with the mold engagement part can be released.
A winged indwelling needle is used.

[0006]

According to the above arrangement, when the indwelling needle is punctured into the skin of the patient, the hub is at the first position of the holding cylinder, and the hub and the holding cylinder are engaged by the mutual engaging means. So
The hub does not move in the second position direction, that is, in the proximal direction due to the force about the puncture resistance. Furthermore, after the indwelling needle used, even if the tip of the cannula moves the hub to a second position accommodated in the hold tube, the hub and the holding cylinder is engaged by interengaging means, The hub does not move in the first direction, that is, in the distal direction, unless the hub is moved in the first direction. Furthermore, the hub is the first
The hub can be moved only from the second position to the second position, so that the hub does not fall out of the holding cylinder.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a partially longitudinal plan view of a winged indwelling needle according to one embodiment of the present invention, FIG. 2 is a partially longitudinal side view of FIG.
FIG. 3 is a partially longitudinal plan view showing a state in which the hub is slid backward in FIG. 1 and the needle tip is accommodated in the holding cylinder, and FIG.
5 is a partially longitudinal plan view showing a state in which the hub is rotated in the direction of arrow B in FIG. 3 to engage the holding cylinder with the hub, and FIG. 6 is a partially longitudinal side view of FIG. FIG. 7 is a sectional view taken along line AA of FIG. FIG. 8 is a partially longitudinal plan view showing another embodiment of the present invention, and FIG. 9 is a partially longitudinal side view of FIG. As shown in FIGS. 1 to 9, a winged indwelling needle according to the present invention includes a cannula 1, a hub 2 supporting a proximal end 11 of the cannula 1, and a tube 3 connected to a proximal end 21 of the hub 2. , And a holding tube 4 for holding and holding the hub 2 therein, and the holding tube 4 is provided with wings 5 on the tip end 42 side. The hub 2 moves from the first position on the distal end 42 side of the holding cylinder 4 to the second position on the proximal end 41 side.
And the hub 2 and the holding cylinder 4 are provided with mutual engagement means. When the hub 1 is at the first position of the holding cylinder 4, the second position is attained. prevents movement in the direction, when the hub 2 is in the second position of the holding tube 4 is adapted to prevent movement in the first position.

The cannula 1 is made of metal such as stainless steel (SU).
S304 is preferable), and has a cutting edge 12 at the distal end, and the proximal end 11 side is supported by the distal end 22 side of the hub 2. The hub 2 is usually formed of a flexible resin such as polypropylene, polyester, or polyethylene, and has a guide groove 23 formed on its outer wall in a longitudinal direction from a position close to the front end 22 toward the base end 21. cage, engagement fovea 25 is provided in the 22-side end tip of the guide groove 23 laterally adjacent to the groove 23. The tube 3 is connected to the base end 21 of the hub 2.
An engagement arm 24 is provided on one side. The engaging arms 24 are normally provided as a pair of left and right sides as shown in the figure, but may be provided on either the right or left side. The shape is provided with a hook 241 at the tip as shown in FIG. Those that are separated from are adopted. By providing the slit 244, the hub 2 can be easily bent inward due to the flexibility of the forming material. The hook 241 has a U-shaped groove 242 as shown in FIGS. 1 and 4, and the hook 241 is disengaged from an engagement hole 44 described later by bending the engagement arm 24 inward with a finger. Even when the state is released, as shown in FIGS. 8 and 9, the engagement arm 24 has a spherical projection 245 outside the distal end portion, and the thin portion 247 is located closer to the distal end side than the base end 246 of the hook 241. The hook 241 is easily bent by pulling the hub 2, and the engagement hole 44 described later is provided.
(Or the engagement hole 45), the engagement state may be released. In addition, the engagement hole 25 of the tip 22 of the hub 2 is
It may be provided in accordance with the number of the engagement projection 43, thus engaging
One pair may be provided on both sides of the guide groove 23 corresponding to the number of the projections 43 , or only one may be provided on one side.

The holding cylinder 4 is a cylindrical member that accommodates and holds the hub 2 therein, and has flexible wings 5 on the outer wall on the tip 42 side. Then, the inner wall of the hub 2 and the second position to the holding cylinder 4 cannula 1 the tip of the cannula 1 from a first position to a predetermined length protrudes from the distal end 42 of the hold cylinder 4 is accommodated in the hold cylinder 4 Can be slid along. 2, 4, and 6 are provided on the inner wall of the holding cylinder 4 on the base end 41 side.
Engagement projection 4 which engages with engagement hole 25 of hub 2 as shown in FIG.
The engaging projection 43 is fitted in the guide groove 23 of the hub 2 and can move only from one end of the guide groove 23 to the other. In addition, the engagement protrusion 43
The hook 241 of the engaging arm 24 of the hub 2 is further closer to the base end 41.
Is provided with an engagement hole 44 that engages with. Hook 241
8 and 9 has a spherical projection 246 as shown in FIGS. 8 and 9, instead of the engagement hole 44, an engagement hole 45 having a shallow concave surface is formed inside the engagement projection 43 on the base end 41 side. It may be provided.

When the indwelling needle with wing is used, the positional relationship between the hub 2 and the holding cylinder 4 is as shown in FIGS. 1, 2 and 8. In this state, the hub 2 is located at the first position of the holding cylinder 4, and accordingly, the cutting edge 12 at the tip of the cannula 1 is positioned to protrude a predetermined length from the tip 42 of the holding cylinder 4. And the first
, The hub 2 and the holding cylinder 4 are engaged with the engagement arms 24 of the hub 2.
(Accurately, the hook 241 of the engaging arm 24) and the engaging hole 44 (or the engaging hole 45) of the holding cylinder 4 are mutually engaged by the first engaging means, and the winged indwelling needle is When the skin is punctured, the hub 2 does not move to the base end 41 side of the holding cylinder 4.

After the winged indwelling needle is used, in the case of the winged indwelling needle shown in FIGS. 1 to 6, when the engaging arm 24 is strongly pinched with a finger, the engaging arm 24 is bent inward and Since the hub 2 is disengaged from the engagement hole 44 and the hub 2 is moved toward the base end 21 with the engagement arm 24 pinched with a finger, the engagement protrusion 43 on the inner wall of the holding cylinder 4 is Move from position 1
At the second position, the engagement projection 43 collides with the end wall of the guide groove 23, and the movement of the hub 2 toward the base end 21 is stopped (see FIGS. 3 and 4). At this time, the cutting edge 12 of the cannula 1 is completely accommodated in the holding cylinder 4. In the case of the winged indwelling needle shown in FIGS. 8 and 9, when the engaging arm 24 is pinched with a finger and the hub 2 is pulled in the proximal direction, the hook 241 bends inward to engage the holding cylinder 4. The hub 2 comes off the base 2
Move in one direction. At this time, the engagement protrusion 4 on the inner wall of the holding cylinder 4
3 moves from the first position along the guide groove 23, and at the second position, the engaging projection 43 collides with the end wall of the guide groove 23, and the movement of the hub 2 toward the base end 21 is stopped. (See FIG. 9).

Next, as shown in FIGS. 5 and 6, when the hub 2 is turned in the direction of arrow B, the engaging projection 43 of the holding cylinder 4 is moved to the wall 26 between the guide groove 23 and the engaging hole 25 of the hub 2. , And moves into the engagement hole 25, and the engagement protrusion 43 and the engagement hole 25 are fitted. In this state, the hub 2 is provided with the engagement projections 4 having a low wall therebetween.
Although movement in three directions is possible, movement in other directions is not possible, and the cannula 1 is safely protected in the holding cylinder 4.

[0013]

As is apparent from the above description, the use of the winged indwelling needle of the present invention makes it possible to reliably prevent a medical worker from accidentally puncturing accidentally. Since the cutting edge can be accommodated in the holding cylinder simply by moving the blade along the base end thereof, it is possible to obtain effects such as easier operation as compared with the type in which the blade is removed.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal plan view of a winged indwelling needle according to one embodiment of the present invention.

FIG. 2 is a partial longitudinal side view of FIG.

FIG. 3 is a partially longitudinal plan view showing a state in which the hub is slid backward in FIG. 1 and a needle tip is accommodated in a holding cylinder.

FIG. 4 is a partial vertical side view of FIG. 3;

5 is a partially longitudinal plan view showing a state where the hub is rotated in the direction of arrow B in FIG. 3 to engage the holding cylinder and the hub.

FIG. 6 is a partial vertical side view of FIG. 5;

FIG. 7 is a sectional view taken along line AA of FIG. 1;

FIG. 8 is a partially longitudinal plan view showing another embodiment of the present invention.

FIG. 9 is a partial vertical side view of FIG. 8;

[Explanation of symbols]

 Reference Signs List 1 cannula 2 hub 23 guide groove 24 engaging arm 241 hook 25 engaging hole 3 tube 4 holding cylinder 43 engaging protrusion 44 engaging hole 45 engaging hole 5 wing

Claims (5)

(57) [Claims] 1. A cannula having a cutting edge at a distal end, a hub having a distal end and a proximal end and supporting a proximal end side of the cannula at the distal end side, a tube connected to a proximal end of the hub, and a distal end. A flexible wing is provided on the outer wall on the distal side having a proximal end,
The hub comprises a holding tube that accommodates and holds the hub therein, and the hub is such that the distal end of the cannula is accommodated in the holding tube from a first position where the cannula projects a predetermined length from the distal end of the holding tube. 2 is slidable along the inner wall of the holding cylinder to a position 2 ;
Prevents movement in the second position direction when in the first position
First engaging means for engaging the first position when in the second position;
Interlock comprising second engagement means for preventing movement in the mounting direction
Engaging means is provided, wherein the first engaging means is provided with a guide groove of the hub.
Due to the flexibility of the hub forming material provided more proximally,
Male engaging part that can be easily bent inside and holding cylinder
From the female engaging portion provided on the base end side of the engaging projection.
The female engaging portion is bent inward to
So that the engagement state with the mold engagement part can be released.
An indwelling needle with wings. 2. A guide groove in a longitudinal direction is formed on an outer wall of a hub, and an engaging protrusion is provided on an inner wall on a base end side of a holding cylinder, and the engaging protrusion is fitted with the guide groove and extends along the groove. The indwelling needle with a wing according to claim 1, which is configured to slide. 3. A male engaging portion having a hook outside the distal end.
Is formed with an engaging arm, and the female engaging portion is
Winged indwelling needle according to claim 1 or 2 comprising. 4. The method according to claim 1, wherein the male engaging portion is convex outside the front end.
It is composed of an engagement arm with a projection made of
The winged indwelling needle according to claim 1 or 2, comprising an engagement fossa having a shallow concave surface . 5. A second engaging means comprising a shallow engaging hole provided adjacent to a front end of a guide groove of the hub and an engaging protrusion of the holding cylinder, and rotating the hub about a longitudinal axis. 5. The engaging projection moves in the direction of the engaging cavity over the partition between the guide groove and the engaging cavity when engaged, and fits into the engaging cavity.
A winged indwelling needle according to any one of the above.