BRIEF DESCRIPTION OF THE DRAWINGS
The drawing disclose illustrative embodiments of the present invention which serve to exemplify the various advantages and objects hereof, and are as follows:
FIG. 1 is an exploded view of the present invention;
FIG. 2 is a longitudinal cross sectional view of the present invention;
FIG. 3 is a schematic view of the present invention wherein the connecting sleeve and the push rod are conjoined together;
FIG. 4 is a transverse cross sectional view (1) of the present invention wherein the connecting sleeve and the push rod are conjoined together;
FIG. 5 is transverse cross sectional view (2) of the present invention wherein the connecting sleeve and the push rod are conjoined together;
FIG. 6 is schematic view in an embodiment of the present invention illustrating how to attach the needle base to the syringe tube;
FIG. 7 to FIG. 9 is schematic views in another embodiment of the present invention illustrating how to attach the needle base to the syringe tube;
FIG. 10 is a schematic view of the present invention illustrating how the needle base is tightly combined with the syringe tube by screwing;
FIG. 11 is a transverse cross sectional view of FIG. 10;
FIG. 12 is a transverse cross sectional view of the threaded section of the syringe tube according to the present invention;
FIG. 13 is a transverse cross sectional view of the connecting sleeve according to the present invention;
FIG. 14 is a schematic view of the present invention showing the push rod is completely separated from the needle base; and
FIG. 15 is an illustrative view of the present invention wherein the push rod is pulled out of the syringe tube and the push rod is broken at the frangible neck.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 is an exploded view of the present invention, which shows the safety syringe device, comprises a push rod 1, a connecting sleeve 2, a syringe tube 3, a needle base 4, and a needle cover 5.
As shown in FIG. 1 and FIG. 2, the push rod is further composed of the following parts orderly from top to bottom, namely a top post 11, a collar 12, a stem 13, a stop ring 14, a stop ring base 15, a frangible neck 16, a push rod proper 17, and an application plate 18. The stop ring 14 and the stop ring base 15 are upwardly tapered.
The connecting sleeve 2 having a main cavity 21 and a conical cavity 22 is just to sleeve over the top post 11, the collar 12 and the stem 13 of the push rod 1. As shown in FIG. 3 through FIG. 5, a dimple 221 formed at the bottom of the conical cavity 22 can be coupled with the stop ring 14. The dimple 221 formed at the conical cavity 22 is configured approximately into an ellipse with a total circumferential length shorter than that of the stop ring 14 of the push rod 1 such that the stop ring 14 can be retained tightly in the dimple 221 without the worry of separating accidentally. The connecting sleeve 2 is divided into a top section 23, a stepped middle section 24, and a joint section 25. The top section 23 and the stepped section 24 are tapered, while the joint section 25 is provided with several ribs 26 and at least two adjacent ribs 26 are mutually spaced each other with an angular distance smaller than that of two ribs 34 provided on the syringe tube 3 to be described below.
The syringe tube 3 has a tubular space 31 to serve as a container for drugs, the top end thereof is tapered to form a stop portion 32, and an internal annular protrusion 37, an open flared portion 38 are successively formed towards the bottom, and finally an application plate 39 is attached externally to the bottom end to be handled with fingers. The application plate 39 may be in a circular disc type or the like. The open flared portion 38 is for retaining the stop ring base 15 of the push rod 1 with the stepped annular protrusion 37 so as to prevent the push rod 1 to be tugged out accidentally.
The inner part of the stop portion 32 is forwardly tapered into a hollow conical shape to form, from top to bottom, a retainer ring 33, several ribs 34, an upper ring 35, and a threaded section 36 in order, wherein the ribs 34 are disposed in an equal angular spacing. The threaded section 36 is provided with a singular or a double threading. As shown in FIG. 6, after the connecting sleeve 2 is pushed to reach the stop portion 32 by the push rod 1, it is retained thereat stably by the retainer ring 33 and the upper ring 35 in the manner with its stepped section 24 to tightly bite the inner upper fringe of the upper ring 35 such that a hermetic space is formed between the push rod 1 and the connecting sleeve 2. After that the needle base 4 can be conjoined to the syringe tube 3 by screwing along the threaded section 36. In the conventional safety syringe device, an annular watertight rubber is necessary to be provided around the stepped section 24 of the connecting sleeve 2 so as to keep out moisture. Quite on the contrary, the present invention can do without such a watertight rubber, and instead, by closely urging the inner wall surface of the syringe tube 3 with the conical annular outer surface of the stepped section 24, the aim of water tight can be easily attained that leads to saving the additional component and assembling work.
Returning to FIG. 1 and FIG. 6, the needle base 4, consisting of a conical tunnel 41, an upper needle tip 42, and a lower retainer flange 43 can be easily screwed into the syringe tube 3 along the threaded section 36, and then coupled tightly with the top section 23 of the connecting sleeve 2 (see FIG. 10). As the retainer flange 43 is just located under the threaded section 36 and is confined there unable to be released from the threaded section 36, the needle base 4 including the needle tip 42 and the syringe tube 3 is conjoined in one unit. With this structure, to pull out the needle tip 42 from the patient skin after completion of syringe, there is no worry of remaining the needle tip 42 in the patient body by accidental separation of the needle tip 42 from the syringe device.
Referring to FIG. 7 through FIG. 9, other than forming the stop portion 32 to a tapered conical hollow body, alternatively, the retainer ring 33, the ribs 34 and the upper ring 35 are replaceable for the function of the threaded section 36. By doing without the threaded section 36, the user may directly push the needle base 4 into the top sleeve section 23 of the connecting sleeve 2 so as to simplify operation.
Referring to FIG. 11 through FIG. 13, when the connecting sleeve 2 is pushed to reach the stop portion 32 of the syringe tube 3 by the push rod 1, the ribs 34 thereat and the corresponding ribs 26 collaborate to hold the connecting sleeve 2 at position without slipping so as to facilitate assembling of the needle base 4.
As shown in FIG. 1 through FIG. 6, a needle cover 5 is formed into a hollow conical cavity 51 to protect the needle tip 42 by enclosing it. Several ribs 52 are formed along the external fringe of the needle cover 5. The needle cover 5 is either formed into a through type, or having only one opening.
Referring to FIG. 6, FIG. 10 and FIG. 14, After the connecting sleeve 2 is settled at the stop portion 32 of the syringe tube by push rod 1, the needle base 4 along with its needle cover 5 is screwed into the needle tube 3 via threaded section 36 so as to fix the needle base 4 to the top sleeve section 23 of the connecting sleeve 2. After that removing the needle cover 5, and inserting the needle tip 42 into the drugs or patient body, then slowly pulling back the push rod 1 to fill the syringe tube 3 with the drug or draw the blood from the patient's body (see FIG. 14).
Still referring to FIG. 14, as soon as the syringe is finished, the connecting sleeve 2 is again conjoined with the stem 13 by pushing the push rod 1, at this time the whole needle tip 42 enclosed by the needle cover 5, the push rod 1 is pulled backward and the needle cover 5 is pressed downward to push the whole needle cover 5 including the needle tip 42 into the syringe tube 5. Again pulling out the needle cover 5 and reversely inserting the needle cover 5 into the syringe tube 3 from the stop portion 32, finally breaking the push rod proper 17 of the push rod 1 emerging out of the syringe tube 3 from the frangible neck 16 (see FIG. 15).
Many changes and modifications in the above-described embodiments of the invention can, of course, be carried out without departing from the scope hereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.
Patent Application
20080058731
