JPH02302265A - Syringe - Google Patents

Abstract

PURPOSE: To provide a disposable injector with a safety cover by applying a lock means between a supplemental sleeve and a shell to safely lock the sleeve on its completely extended position so as to perfectly cover up a needle for the protection of a user, from an injury by the needle. CONSTITUTION: Inside of a sleeve 16 is processed a projection 18 to slightly extend out to its radial inside corresponding to a slit 19 processed on the outer side of the shell 11. The slit 19 extending in the axial direction along the shell, extends around at the inner edge and rotates the sleeve 16 a quarter by means of screws 24, 25 ending up locking it at a stable position. Depth of the extension sideways of the slit 19 is specified so that the projection 18 comes into and tightly friction-engaged with the extension. The friction engagement between the extension 30 and projection 18 serves as a lock means to hold the sleeve 16 on its backward position. On outer edge of the slit 19 is processed a ramp 31 to radically extend from the deepest depth of the slit 19 to a recessed part 32 meeting the projection 18 in shape and size.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to hypodermic injections, and more particularly to syringe assemblies, and particularly to such assemblies that are safe for use in the medical field.

BACKGROUND OF THE INVENTION A common means to ensure the sterility of hypodermic needles before use and to protect the handler after use is to use a conventional cap that sits on a collar surrounding the needle. There is. However, these caps do not reliably protect the syringe handler after use. There were many opportunities for users to slide the cap backwards while doing so and in doing so, injure their skin by pricking it, resulting in infection. In most cases, such wounds do little harm, but with the outbreak of autoimmune deficiency syndrome (AIDS), medical personnel are using blood from or after injecting patients with highly contagious diseases. After removal, the potentially contaminated needle is likely to puncture the skin of the syringe handler.

A typical modern syringe is a disposable device consisting of a plunger, a barrel, and a needle with a protective cap. To date, many attempts have been made to improve upon the conventional needle protection means described above, of which the closest known to the applicant is the Winstead - U.S. Patent No. 4.5 issued to Hall
No. 36.822. The syringe disclosed in this patent has a conventional barrel, plunger, and needle, but over which a separate sleeve can be slid. The primary purpose of this sleeve is to provide a means for accurately measuring the depth to which the gauge in FIG. 1 of this patent has penetrated into human tissue. Although the patentee is clearly concerned with safety, i.e. minimizing the possibility of inadvertent stick injuries by the user, this patent does not cover the sleeve when the sleeve is positioned over the needle after use of the syringe. No mention is made of safety issues.

There is a need for a disposable syringe having a safety cover that, once locked in place, cannot be removed from the locked position without the application of significant force.

SUMMARY OF THE INVENTION The present invention provides a locking means between the auxiliary sleeve and the barrel to safely lock the sleeve in a fully extended position where the needle is completely covered and prevents injury to the user due to the meter. By providing this, the drawbacks of the prior art as described above are overcome. More specifically, the present invention includes a cylinder having a transparent cylindrical shape over the main part in the longitudinal direction and having a hypodermic needle attached to one end thereof, and a cylinder mounted in the cylinder so as to be movable in the longitudinal direction, It consists of a piston connected to a handle projecting from the opposite end of the tube, and a sleeve dimensioned to fit over the tube and slidably mounted along the tube. concentrically surrounding the tube with an extended position extending beyond the needle from the one end;
The sleeve is axially movable between a retracted position exposing the needle for use, the sleeve having a length corresponding to the length of the barrel, and when in the retracted position, the sleeve a transparent cylindrical wall to permit unobstructed viewing of the entire extent and therefore the interior of the tube, and further to lock the sleeve against axial movement relative to the tube when in the retracted position; a first locking means;
and second locking means for safely locking the sleeve in the extended position where the needle is completely covered and prevents injury to the user by the needle.

(Operation and Effect) The first locking means locks the sleeve onto the transparent central portion of the sleeve so that the tube is unobstructed during and until use, thereby preventing inadvertent displacement of the sleeve. After use, the sleeve is moved to the extended position and the second locking means is engaged to securely lock the sleeve in this position.

Preferably, a threaded cap is provided to sit on the end of the sleeve once the sleeve is fully extended and locked in place.

The present invention provides an inexpensively manufactured disposable syringe with substantially improved safety such that the needle does not contaminate the user without deliberate and near-self-destructive action.

In the accompanying drawings, 10 is a syringe, which has a transparent cylindrical tube 1), a plunger 12 supporting a piston 15, and a needle 13. The mark 15 on the cylinder 1 is the piston 15
The end of the syringe indicates the amount of fluid drawn into the syringe.

The tubular cylindrical sleeve 16 is dimensioned to fit closely into the tube 1), so that when the sleeve is in its initial state it completely covers the tube 1), thus making a total of 13
protrudes beyond the end of the sleeve, ie to the left in FIG. Sleeve 16 is transparent and has a substantially uniform thickness over its major longitudinal portion, so that sleeve 16 has a substantially uniform thickness as shown in FIG.
- When in the first, retracted position, not only the indicator but also the entire barrel 1) and its contents can be easily seen. The packaged syringe is provided with a standard smaller sleeve 17 of the type known in the art, which in the present invention is removed prior to use.
After use, there is no need to reuse the tube, so it is discarded.
The l and sc hoops 16 are formed from a suitable plastic material.

The sleeve 16 is secured before use by a screw 24 on the outside of the tube 1) and a matching screw inside the distal end of the sleeve. When sleeve 16 is rotated a quarter of a turn relative to cylinder 1), cylinder 1
) to allow sleeve 16 to move axially.

In FIG. 2, sleeve 16 is fully extended to completely cover needle 13 and prevent physical contact with the needle due to accident. Preferably, a cap 8 is provided with an external thread 26 matching the thread 25, which cap is barcaged with the syringe 10 and is used to ensure the safety of the assembly after use.

On the outside of the tube 1) there is a structure formed in the plastic material forming the tube, which is an important feature of the invention, namely the safety locking means. Sleeve 16
A projection 18 is formed inside the cylinder 1), which extends a small distance in a radial inward direction corresponding to a recess 19 (FIG. 2) formed on the outside of the cylinder 1). 19 years old
extends axially along the cylinder and extends at the right or inner end 3
0, and the screw 24.25 allows the sleeve to be locked in the rest position by a quarter turn as described above. The lateral extension 30 of the groove 19 thus extends a quarter or slightly over a quarter of the inner circumference of the tube 1). The depth of the lateral extension 30 is approximately 19 mm.
is such that it enters and fits tightly into the extension, creating a frictional engagement. The protrusion is thus frictionally retained within the extension 30, and considerable force is required to dislodge the protrusion and move it into alignment with the groove. Extension 30 and protrusion 18
This frictional engagement between the sleeve 16 and the sleeve 16 provides another locking means for locking the sleeve 16 in the retracted position. Groove 19
At its opposite or outer end is formed a ramp 31 extending radially outward from a maximum depth of 19 to a recess 32 corresponding in size and shape to projection 18 . Therefore, by turning the sleeve a quarter turn to remove the sleeve from the screw 24 and from the groove portion 30, the sleeve can be pulled to the outermost or left-hand position with the projections 18 fully engaged. When the sleeve 16 is rotated to the zero degree, the protrusion 18 elastically climbs up the ramp 31 (this movement is caused by the movement of the sleeve 16 and/or tube 1).
(adjusted by the bending of the sleeve) into the recess so that the sleeve can be firmly locked in the discard position shown in FIG. It will be appreciated that the sleeve 16 cannot be removed from the locked position without the application of significant force, either torsionally or axially, thus protecting users such as cleaning personnel, after which the cap 8 Screw it into place inside the cylinder to complete the protective cover.

Although the present invention is primarily intended for use with syringes, other assemblies having percutaneous needles may similarly be provided with a protective sleeve.

[Brief explanation of drawings]

FIG. 1 is a side view of a syringe according to the present invention, and FIG. 2 is a side view of a syringe according to the present invention.
FIG. 3 is a view of the syringe with the sheath separated; FIG. 4 is a view similar to FIG. 1 with the protective sheath in an extended state;
FIG. 2 is a sectional view taken along line 4-4 in FIG. 2; 10...Syringe, 1)...Cylinder, 16...Sleeve, 18...Protrusion, 19...Groove, 30...
・Extension part.

Claims (10)

[Claims] (1) A tube that has a transparent cylindrical shape over its main longitudinal portion and has a hypodermic needle attached to one end, and an opposite end of the tube that is attached within the tube so as to be movable in the longitudinal direction. a piston connected to a handle projecting from the tube; and a sleeve sized to fit over the tube and slidably mounted along the tube, the sleeve extending from the one end of the tube to the needle. and a retracted position concentrically surrounding said barrel and exposing said needle for use, said sleeve having a length corresponding to the length of said barrel. having a transparent cylindrical wall so as to permit an unobstructed view of substantially the entire extent of the transparent portion and thus the interior of the tube when in the retracted position; a first locking means for locking said sleeve against axial movement against said sleeve; and locking means for safely locking said sleeve in said extended position where the needle is fully covered and prevents injury to the user by the needle. a second locking means. (2) said first and second locking means include rib and groove means that cooperate to guide said sleeve in moving said sleeve between a retracted position and an extended position; one has a detent and the other has a complementary locking recess approached by a circumferentially elongated sloping ramp, said detent being in contact with said ramp and said recess when said sleeve is in an extended position. When aligned and thus rotating the sleeve, the detent is brought into contact with the ramp and is thus guided into engagement with the locking recess, with the sleeve allowing the detent to move over the ramp. A syringe according to claim 1, comprising a plastic material shaped to adjust its elastic deflection. (3) the sleeve has an internal protrusion, the second locking means includes a wall defining a locking recess within the barrel, and the internal protrusion is such that the sleeve is in the extended position when the sleeve is in the extended position; 2. When the locking recess is moved a predetermined amount, the tube is located within the recess, and the tube has an inclined ramp that approaches the locking recess and guides the protrusion and facilitates entry into the groove. 1. The syringe according to 1. (4) The first locking means includes a screw formed in the end of the sleeve, which screw is connected to the cylinder when the sleeve is in the retracted position and locks the sleeve so that the sleeve does not move in the axial direction. 4. A syringe according to claim 1, 2 or 3, which is engageable with a complementary thread formed in the syringe. (5) The first locking means includes a complementary recess into which the protrusion can enter when the sleeve is rotated, and the recess frictionally engages with the protrusion to prevent the protrusion from coming off. or the syringe described in 3. (6) Consisting of a protrusion provided on the inner surface of the sleeve, a fitting groove extending along the outer surface of the tube and having both ends adjacent to both ends of the tube, and an inclined ramp extending from the groove and terminating in a recess; includes said second locking means and is dimensioned to receive and lock a projection, said projection extending along said groove as the sleeve moves along the barrel until said projection aligns with the ramp. 2. The syringe of claim 1, wherein the syringe is movable and as the sleeve moves further, the protrusion climbs the ramp and then falls into the recess, locking the sleeve in the extended position. (7) The first locking means is formed at an end of the sleeve and engages with a fitting screw formed on the cylinder when the sleeve is in a retracted position to lock the sleeve from moving in the axial direction. 7. The syringe of claim 6, including a removable thread and having a circumferential extension for accommodating said projection when said sleeve is rotated to engage or disengage said mating screw. 8. The syringe of claim 6, wherein the amount of rotation of the sleeve to fully engage the screw is approximately one-fourth of one rotation. 9. The syringe of claim 5, 6, 7 or 8, further comprising a threaded cap that engages the thread on the sleeve when the sleeve is in the extended position and the associated end of the sleeve is fully closed. (10) The sleeve is of a molded plastic material, and the cylindrical wall of the sleeve is of a substantially constant thickness over at least a major portion of its length so as to allow unhindered viewing of the tube through the wall. The syringe according to any one of claims 1 to 9.