Assemblable compact syringe with side mounted plunger rod
The syringe design with a detachable plunger body and stopper assembly addresses the challenge of precise drug administration by enabling controlled actuation of the stopper, improving the syringe's precision and reliability.
Patent Information
- Authority / Receiving Office
- HK · HK
- Patent Type
- Applications
- Current Assignee / Owner
- PACTO MEDICAL INC
- Filing Date
- 2026-06-05
- Publication Date
- 2026-07-10
AI Technical Summary
Existing syringes lack a design that allows for efficient and reliable actuation of the stopper for precise drug administration, particularly in scenarios requiring high precision and control.
A syringe design featuring a plunger body with a first end coupled to a stopper or stopper insert and a second end reversibly attached to the syringe body, allowing for detachable assembly to actuate the stopper for precise injection.
Enables precise and reliable drug administration by facilitating controlled actuation of the stopper, enhancing the syringe's functionality for applications requiring high precision.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
A syringe, a reagent kit, and methods of manufacture and use thereof are provided. The syringe includes a syringe body defining an internal volume. The syringe body defines a first opening at a distal end for drug administration and a second opening at a proximal end. The syringe also includes a stopper disposed within a barrel, a stopper insert optionally coupled to the stopper, and a plunger body disposed externally on the syringe body. The plunger body has a first end, a second end, and an intermediate portion. The intermediate portion is arranged along the inner wall of the barrel. The first end of the plunger body is configured to be coupled to the stopper or the stopper insert, and the second end is reversibly attached to the distal or proximal end of the syringe body. The plunger body is detachably assembled to the stopper or the stopper insert to actuate the stopper for injection. Abstract
Claims
What is claimed is:
1. A syringe comprising: a syringe body having a distal end, a proximal end, and a barrel between the distal end and the proximal end and having a barrel wall defining an interior volume, the syringe body further defining a first opening at the distal end for dispensing and a second opening at the proximal end; a stopper disposed inside the barrel and configured to seal the interior volume; and a plunger rod disposed outside the syringe body, the plunger rod having a first end, a second end, and a middle section, the middle section disposed along the barrel wall, wherein the second end of the plunger rod is reversibly attached to the distal end or the proximal end of the syringe body, the plunger rod is configured to be detached and assembled by a user so as to drive the stopper in a direction from the proximal end to the distal end of the syringe body.
2. The syringe of claim 1, wherein the syringe body comprises a barrel flange on the proximal end.
3. The syringe of claim 2, wherein the plunger rod comprises a snap cylinder and defines a concave portion between the snap cylinder and the middle section, wherein the concave portion is configured to receive a portion of the barrel flange of the syringe body.
4. The syringe of claim 1, wherein the plunger rod is configured to be detached and assembled with the stopper.
5. The syringe of claim 1, further comprising a stopper insert having a distal portion and a proximal portion, the stopper insert disposed inside the barrel and coupled with the stopper at the distal portion, wherein the plunger rod is configured to be detached and assembled with the stopper insert.
6. The syringe of claim 5, wherein the first end of the plunger rod comprises a raised lip configured to form a mechanical interlock with a cantilever arm in the stopper insert through asnap mechanism, wherein the first end of the plunger rod is sized and configured to be coupled with the stopper insert,7. The syringe of claim 5, wherein the proximal portion of the stopper insert is flexible and having threads therein, and the first end of the plunger rod comprises a barb structure having angular edged structures, wherein the barb structure is configured to be inserted into and lock with the proximal portion of the stopper insert through the angular edged structures inside the threads.
8. The syringe of claim 5, wherein the proximal portion of the stopper insert comprises a protrusion in a middle and defines a trench around the protrusion, the first end of the plunger rod defines a hole, the first end of the plunger rod is configured to be disposed in the trench, and the protrusion is configured to be disposed inside the hole to provide a male / female interlocking structure.
9. The syringe of claim 1, wherein the first end of the plunger rod comprises a patterned tip structure, the proximal portion of the stopper insert defines a patterned depression having a shape complimentary to the patterned tip structure, and the first end of the plunger rod is configured to be twistedly fitted into the proximal portion of the stopper insert.
10. The syringe of claim 1, wherein the second end of the plunger rod comprises a plunger flange configured to be reversibly attached to the distal end or the proximal end of the syringe body.
11. The syringe of claim 10, wherein the plunger flange at the second end of the plunger rod defines a hole, and the second end of the plunger rod is attached to the distal end of the syringe body, wherein the distal end of the syringe is disposed through the hole.
12. The syringe of claim 1, wherein the second end of the plunger rod is attached to the distal end of the syringe body.
13. The syringe of claim 1, wherein the second end of the plunger rod is attached to the proximal end of the syringe body.
14. The syringe of claim 1, wherein the middle section of the plunger rod has a wall with a curved surface matching with a portion of an exterior surface of the barrel wall.
15. The syringe of claim 14, wherein the middle section of the plunger rod is proximal to or in contact with the portion of an exterior surface of the barrel wall.
16. The syringe of claim 1, wherein the syringe is a prefilled syringe comprising a therapeutic product disposed inside a portion of the interior volume between the distal end of the syringe body and the stopper.
17. The syringe of claim 1, further comprising a cap disposed at the distal end of the syringe body and configured to seal the first opening at the distal end for dispensing.
18. The syringe of claim 1, wherein the distal end of the syringe is configured to be attached with a needle.
19. A kit comprising the syringe of claim 1.
20. A method of making the syringe of claim 1, comprising: providing the syringe body, the stopper, and the plunger rod; and attaching the plunger rod to the syringe body.
21. The method of claim 20, further comprising providing a stopper insert; coupling the stopper insert and the stopper; and inserting the stopper insert and the stopper into the barrel of the syringe body from the second opening.
22. The method of claim 1, further comprising: filling a pre-determined amount of a therapeutic product into a portion of the interior volume between the distal end of the syringe body and the stopper.
23. A method of using the syringe of claim 1, comprising: detaching the plunger rod from the syringe body; and assembling the plunger rod with the stopper or a stopper insert inside the barrel, wherein the first end of the plunger rod is coupled with a proximal end of the stopper or the stopper insert.