MINI SYRINGE

Abstract

A mini syringe includes a tubular base member, a microneedle unit including a microneedle device and a compressible pharmacy housing device and mounted in the bottom side of the base member, a plunger mounted in the base member and pressable to compress the pharmacy housing device, and an adjustment cover threaded onto the base member for controlling the moving distance of the plunger in a micro-adjustable manner.

Claims

1. A mini syringe, comprising: a base member comprising a center hole, a flange extended around a bottom side thereof, and an outer thread spirally extended around the periphery thereof; a microneedle unit is mounted in a bottom end of said center hole of said base member and consisting of a microneedle device and a pharmacy housing device, said microneedle device comprises at least one microneedle, said pharmacy housing device comprising at least one drug chamber respectively disposed corresponding to said at least one microneedle; a plunger mounted in an opposite top end of said center hole of said base member, said plunger comprising a plunger body axially slidably inserted into said center hole of said base member, a reduced outer diameter portion upwardly extended from a top side of said plunger body and at least one plunger tip aimed at said at least one drug chamber; an adjustment cover comprising an inner thread threaded onto said outer thread of said base member and a through hole for the passing of said reduced outer diameter portion of said plunger; and a spacer ring mounted between a bottom side of said adjustment cover and said flange of said base member.

2. The mini syringe as claimed in claim 1, wherein said microneedle device comprises a base panel and at least one microneedle; said pharmacy housing device comprises at least one drug chamber corresponding to said at least one microneedle.

3. The mini syringe as claimed in claim 1, wherein said plunger body of said plunger body fits said center hole of said base member and is axially movable relative to said base member by a thrust.

4. The mini syringe as claimed in claim 1, wherein said spacer ring is made of silicone rubber for fine adjustment of the axial displacement of said plunger by said adjustment cover.

5. The mini syringe as claimed in claim 1, wherein said pharmacy housing device is made of silicone rubber by molding.

6. The mini syringe as claimed in claim 2, wherein said base panel and said at least one microneedle of said microneedle device are selectively made of 304 or 316 series stainless steel.

7. The mini syringe as claimed in claim 2, wherein each said microneedle is about 1.3-2.0 mm high, 0.2-0.7 mm outer diameter, 0.1-0.5 mm inner diameter, and 0.05-0.15 mm wall thickness.

8. The mini syringe as claimed in claim 2, wherein said base panel and said at least one microneedle of said microneedle device are selectively formed by deep drawing of sheet metal, metal electroforming, stamping or 3D printing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 is an oblique top elevational view of a mini syringe in accordance with the present invention.

[0008] FIG. 2 is an exploded view of the mini syringe in accordance with the present invention.

[0009] FIG. 3 is a sectional elevation of the mini syringe in accordance with the present invention.

[0010] FIG. 4 is an oblique top elevational view of the microneedle unit of the mini syringe in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0011] Referring to FIGS. 1-4, a mini syringe in accordance with the present invention is shown. The mini syringe comprises a microneedle unit, a base member (1), a plunger (4), an adjustment cover (3) and a spacer ring (5). The base member (1) is a tubular member, comprising a center hole (11), a flange (12) extended around a bottom side thereof, and an outer thread (13) spirally extended around the periphery thereof. The microneedle unit is mounted in a bottom side of the center hole (11) of the base member (1), consisting of a microneedle device (2) and a pharmacy housing device (22). The microneedle device (2) comprises at least one microneedle (211). The pharmacy housing device (22) comprises at least one drug chamber (221) respectively disposed corresponding to the at least one microneedle (211). The plunger (4) is mounted in the opposite top end of the center hole (11) of the base member (1), comprising a reduced outer diameter portion (42) at a top side thereof. The adjustment cover (3) comprises an inner thread (31) threaded onto the outer thread (13) of the base member (1), and a through hole (32) for the passing of the reduced outer diameter portion (42) of the plunger (4). The spacer ring (5) is mounted between the bottom side of the adjustment cover (3) and the flange (12) of the base member (1). As the adjustment cover (3) and the base member (1) are threaded together, the spacer ring (5) limits the locking position of the adjustment cover (3), so that when the adjustment cover (3) is fastened tight, the at least one plunger tip (43) of the plunger (4) is moved into contact with the top edge of the at least one drug chamber (221) of the pharmacy housing device (22) and the plunger body (41) of the plunger (4) fits the center hole (11) of the base member (1) in a slightly tight manner. At this time, the plunger (4) needs to be axially moved by a certain thrust. Further, the spacer ring (5) is made of silicone rubber with appropriate compression for fine adjustment of the axial displacement of the plunger (4) by the adjustment cover (3). The pharmacy housing device (22) is made of silicone rubber by molding. The microneedle device (2) comprises a base panel (21) and at least one microneedle (211). The microneedle device (2) is made of 304 or 316 series stainless steel. The microneedle (211) is about 1.3-2.0 mm high, 0.2-0.7 mm outer diameter, 0.1-0.5 mm inner diameter, and 0.05-0.15 mm wall thickness.

[0012] The base panel (21) and microneedle (211) of the microneedle device (2) can be formed by deep drawing of sheet metal, metal electroforming, stamping or 3D printing.

[0013] When using the mini syringe, pressing the plunger (4) downwards will cause the at least one plunger tip (43) to squeeze the at least one drug chamber (221) of the pharmacy housing device (22), forcing the liquid medicine out of the at least one drug chamber (221) and the at least one microneedle (211) for painless injection in a safe manner.

[0014] In summary, the mini syringe of the present invention has at least one pharmacy chamber for accurately filling the dosage and a convenient and safe structural design. It is disposable for one single use and does not require professional medical personnel to perform injection.