JP2557245B2 - Syringe with safety cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety cap for use with a hypodermic syringe.

The hypodermic needles of syringes typically have protective caps that are removed before injection and frequently replaced after the needle is used to prevent injury from exposed needles and narcotics. When capping a hypodermic needle, the exposed needle and cap move toward each other and are held manually in the cap. Then,
If the needle is not properly inserted into the cap, the used needle may stick into the skin, and this often causes injuries to the medical staff. This kind of needle sticking accident occurs most often when the cap is put on, and since the used needle is contaminated with pathogenic viruses and bacteria, it treats patients with infectious diseases such as hepatitis and AIDS. It is a serious health hazard to health care workers.

The present invention significantly reduces the risk of accidental contact with hypodermic needles, especially for medical personnel who cap used needles, thereby reducing the risk of contracting a disease during treatment of a patient. Is. The present invention was embodied as a safety syringe with a generally cylindrical safety sleeve provided over a hypodermic needle that is slidable along the syringe barrel, exposing the needle during use. After use, the safety sleeve can be slid forward along the syringe barrel and over the needle without the risk of medical personnel contacting the contaminated needle.

The safety sleeve is locked in the fully open and fully closed positions. At least a portion of the safety sleeve is transparent so that a scale indicating the amount of drug solution on the syringe is visible during use. INDUSTRIAL APPLICABILITY The present invention can be applied to syringes of any size and shape, is inexpensive to manufacture, easy to use,
Moreover, it significantly reduces the health risks for health care workers.

Regarding the Drawings FIG. 1 is a front view of a medical injector provided with a safety sleeve according to the principles of the present invention.

2 is an end elevational view of the syringe in FIG. 1 as viewed from the right.

FIG. 3 is an enlarged front view including a partial cross-sectional view of the syringe in FIG. 1 with the safety sleeve in the fully open position.

FIG. 4 is a partial cross-sectional view of another embodiment of a safety syringe according to the principles of the present invention.

FIG. 5 is a partial plan view of the device of FIG. 4 showing the orbital locking device.

In FIG. 1, a safety syringe of the present invention is shown as 10 and has a pair of finger stops 14 projecting in a direction intersecting the axis at the end 16 of the barrel, and along the hollow interior of the barrel 12 of the syringe. It has a plunger 18 that moves in. The position of the plunger 18 is a mark at regular intervals, namely the body 12
It is shown with a scale 20 engraved on the outer surface of the. The other end of the torso 22
A hypodermic needle 24 extends from and communicates with the inside of the body 12. The safety sleeve 26 is adjacent to the other end 22 of the torso
It extends axially around 24. As shown in FIG. 1, the safety sleeve 26 has one end 28 fixed to the body portion 12 and the other end 30 ahead of the tip of the hypodermic needle 18 when in the fully closed position to protect the needle. Do not allow the person handling the syringe 10 to touch the needle 18 by extending it toward. In one embodiment, the safety sleeve 26 has a non-slip surface 32 adjacent one end 28 thereof.

In FIG. 2, the safety sleeve 26 has a generally cylindrical shape,
It is shown to have an opening 34 at the end 30 from which the needle 24 is exposed when the safety sleeve is moved to the fully open position.

In the embodiment shown in FIG. 3, the barrel 12 has a threaded portion 36 adjacent the end 22. Similar threads 38, 40 are formed on the inner surface 42 adjacent the ends 28, 30 of the safety sleeve. When the safety sleeve 26 is in the fully closed position as shown by the solid line in FIG. 1 or the dotted line in FIG. 3, the threaded portion 38 engages over the threaded portion 36 of the barrel 12, resulting in a safety sleeve.
The 26 is securely attached to the syringe 10 and the
Prevent touching. By screwing the safety sleeve 26 by picking the non-slip surface 32 and the like, the screw portion 38 becomes the screw portion of the body portion.
Once uncoupled from 36, the safety sleeve 26 is then slid along the torso towards the finger stop 14 exposing the needle 24. The safety sleeve 26 is then rotated to screw its thread 40 onto the body thread 36, thus holding the safety sleeve 26 in the fully open position and the syringe 10 is ready for use. .

The end 30 of the safety sleeve has a tapered taper 44
Hold and hold the syringe to dehorn and inject. If the safety sleeve 26 is constructed to be somewhat shorter than the trunk 12,
It is convenient in that the finger can be placed freely on the 14th. Even if the safety sleeve 26 is provided in this manner, it does not hinder the use of the syringe 10.

After use, the safety sleeve 26 picks up the non-slip surface 32 and screw
Rotate in the opposite direction until 40 is disengaged from threaded portion 36 of barrel 12. The safety sleeve 26 is then slid forward and again threaded so that the threaded portion 38 engages the threaded portion 36 of the barrel 12 to secure the safety sleeve 26 in a position surrounding the needle 24. In this way, the device prevents the user's hand from touching the hypodermic needle 24 when attaching the cap.

The movement of the safety sleeve 26 is restricted so as not to cross between the fully open and fully closed positions, respectively. For example, at the end 30, the ring-shaped flange 46 extends inwardly of the opening 34 so that the safety sleeve 26 cannot go beyond the set fully open position. Similarly, a protrusion 48 is provided on the other end 28 of the safety sleeve to limit movement of the safety sleeve 26 beyond the fully closed position. In one embodiment, a protrusion 48 is provided extending inwardly at diametrically opposed positions at the end 28 such that, during assembly of the syringe 10, the safety sleeve 26 is initially in the barrel. While having the resilience to engage over the threaded portion 36 of section 12, the safety sleeve 26 cannot be completely removed from the syringe 10 once assembled.

Various locking devices for the syringe 10 and safety sleeve 26 combination are within the scope of the invention. For example, FIG. 4 shows a protrusion 50 extending inwardly from a safety sleeve 52 attached to a syringe 54. The protrusion 50 engages a groove 56 formed in the barrel 58 of the syringe 54. As can be seen more clearly from FIG. 5, the groove 56 extends along the length of the barrel 58 and includes locking portions 60, 62 bent at the ends of the groove 56. Small protrusions 64 and 66 are provided adjacent to the lock portions 60 and 62, and the width of the groove is slightly narrowed. The protrusion 50 is a small protrusion that is put in the lock parts 60 and 62.
It is held in that position by 64, 66. According to the embodiment of FIGS. 4 and 5, the safety sleeve 52 can be quickly released from its fully open or fully closed position by turning it slightly and sliding it, the projection 50 remaining in the groove 56, 52 can be alternated to any position. Conversely, the protrusion 50 may be provided on the syringe barrel 58 and the safety sleeve 52 may be provided with a groove 56 so that it slides therein.

The safety sleeve needs to be formed at least in part of a transparent material so that the fluid scale can be read during syringe use. In the embodiment of Figures 4 and 5, there is no threaded portion to lock the safety sleeve in place, so that the fluid scale on the barrel of the syringe can be read over the entire length of the safety sleeve.

Thus, the use of the safety syringe of the present invention reduces the risk of auto-infection by contaminated needles when medical personnel are engaged in the treatment of infectious diseases. If the safety sleeve is fixed in the fully closed position surrounding the needle, it may be accidentally punctured by the needle even if it is placed near the user after use of the syringe or if it is discarded. Disappears. There is less risk of accidentally touching the needle when moving the slidable safety sleeve between the fully open and fully closed positions.

As will be apparent from the above specification, the invention can be practiced with various modifications other than those described in this document. It is to be understood that all such modifications are, of course, within the scope of my contribution to the technology and that I would like to make them within the scope of the patents granted for this invention.

Claims (5)

(57) [Claims] 1. A hollow barrel having first and second opposite ends; slidable therethrough and extending from the first end of the barrel. A plunger; a hypodermic needle extending axially outwardly from a second, opposite end of the barrel and mounted in fluid communication with the interior of the barrel; a portion of the barrel An enclosing sleeve, the sleeve being slidable between a first position in which the needle projects from the sleeve and a second position in which the needle is housed within the sleeve; Rotational lock engaging means for engaging between the sleeve and the sleeve having locking means extending in the circumferential direction and projections coupled to the locking means extending in the circumferential direction at the second opposite end position. Hypodermic syringe, wherein the rotary locking engagement means are each A longitudinally extending groove with a transversely extending locking portion at the opposite end, and a groove extending in the groove for moving along the groove during the sliding movement of the sleeve and in the longitudinal groove. A projection which is always located and thus prevents free rotation of the sleeve with respect to the body, the longitudinal groove being formed on the outer surface of the body and the projection being movable along the groove. Thus extending inwardly from the inner surface of the sleeve, or the longitudinal groove is formed in the inner surface of the sleeve and the projection extends from the outer surface of the barrel so as to be movable along the groove. A hypodermic syringe characterized in that 2. A hypodermic syringe according to claim 1, wherein the barrel is provided with a liquid scale and at least part of the sleeve is transparent so that the scale can be read through the transparent part of the sleeve. . 3. The body includes first and second detents projecting from a first end thereof in a direction intersecting an axis, the sleeve being in a first position thereof. 2. The ridges are spaced from their finger stops.
Alternatively, the hypodermic syringe described in 2. 4. The end of the sleeve extending in the direction of the hypodermic needle is beveled inward to provide space for the syringe to move for use when the sleeve is in the first position. The hypodermic syringe according to claim 1, 2 or 3. 5. The rotatable locking engagement means selectively locks the sleeve in the second position to prevent the sleeve from unexpectedly slipping off the barrel during use of the hypodermic syringe. 3. The method according to claim 1, wherein
The hypodermic syringe according to 3 or 4.