SYRINGE WITH A BLOCKING STRUCTURE

• US 20130338605A1
• Filed: 04/29/2013
• Published: 12/19/2013
• Est. Priority Date: 06/15/2012
• Status: Active Grant

• Current Assignee: Hshin Chung Lee, Hsiao I. Fan
• Original Assignee: Cho-Ying Chen
• Inventors: CHEN, CHO-YING
• Granted Patent: US 9,168,338 B2
• Time in Patent Office: Days
• US Class Current: 604/218
• CPC Class Codes: A61M 2005/3235 triggered by radial deflection of the anchoring parts between needle mount and syringe barrel or needle housing, e.g. spreading of needle mount retaining hooks having slanted surfaces by engagement with correspondingly shaped surfaces on the piston at the end of an injection stroke
• CPC Class Codes: A61M 2005/3236 Trigger provided at the distal end, i.e. syringe end for mounting a needle
• CPC Class Codes: A61M 5/31501 Means for blocking or restricting the movement of the rod or piston A61M5/5013 takes precedence
• CPC Class Codes: A61M 5/322 Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston devices for protecting guide needles in combination with catheters A61M25/0612
• CPC Class Codes: A61M 5/3234 Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user

Abstract

A syringe with a blocking structure, and the structure includes a one-way engagement unit having a propping portion, a flange extended outwardly from a rod and abutted with a cylindrical body, and a flexible bracket extended outwardly from the rod and isolated from the propping portion, and the flexible bracket has an external diameter greater than the propping portion. When the rod is moved forward with respect to the cylindrical body to pass through the flange, the flange abuts the flexible bracket to tilt backward. When the rod is moved backward with respect to the cylindrical body, the flange abuts the flexible bracket to tilt the flexible bracket forward, and the propping portion blocks the flexible bracket.

Claims

1. A syringe with a blocking structure, comprising:

a cylindrical body, including a flange;

a rod;

a one-way engagement unit, including a propping portion extended outwardly from the rod and contacted with the flange, and a flexible bracket extended outwardly from the rod and isolated from the propping portion, and the flexible bracket having an external diameter greater than the external diameter of the propping portion;

thereby, when the rod is pushed forward with respect to the cylindrical body to push the propping portion and the flexible bracket to pass through the flange, the flange abuts the flexible bracket to tilt backward, and when the rod is pushed backward with respect to the cylindrical body, the flange blocks the flexible bracket.

2. The syringe with a blocking structure according to claim 1, applicable in a cylindrical body, further comprising a barrel and a needle seat combined with the barrel, and the flange being formed on an internal surface of the barrel, characterized in that the rod comprises a rod body section, and an engagement section extended from the rod body section and accommodated in the needle seat, and the propping portion and the flexible bracket being extended outwardly from the rod body section, such that when the rod is pushed backward with respect to the cylindrical body, the flange abuts the flexible bracket to tilt the flexible bracket forward, and then the propping portion is blocked by the flexible bracket.

3. The syringe with a blocking structure according to claim 1, applicable in the cylindrical body, further comprising a barrel and a needle seat combined with the barrel, and the needle seat including a fitting section, and the flange being formed on an internal surface of the needle seat, characterized in that the rod comprises a rod body section, an engagement section extended from the rod body section and accommodated in the needle seat, and a top rod section extended from the engagement section and accommodated in the fitting section, and the propping portion and the flexible bracket are extended outwardly from the engagement section, such that when the rod is pushed backward with respect to the cylindrical body, the flange abuts the flexible bracket to tilt the flexible bracket forward, and then the propping portion is blocked by the flexible bracket.

4. The syringe with a blocking structure according to claim 1, applicable in a cylindrical body, further comprising a barrel, a needle seat combined with the barrel, and the needle seat including a fitting section, and the flange being formed on an internal surface of the fitting section, characterized in that the rod comprises a rod body section, an engagement section extended from the rod body section and accommodated in the needle seat, and a top rod section extended from the engagement section and accommodated in the fitting section, and the propping portion and the flexible bracket are extended outwardly from the top rod section, such that when the rod is pushed backward with respect to the cylindrical body, the flange abuts the flexible bracket to tilt the flexible bracket forward, and then the propping portion is blocked by the flexible bracket.

5. The syringe with a blocking structure according to claim 1, applicable in a cylindrical body, further comprising a barrel, a needle seat combined with the barrel and including a fitting section, and two flanges, and the three flanges are formed on internal surfaces of the barrel, the needle seat and the fitting section respectively, characterized in that the syringe further comprises two one-way engagement units, and the rod comprises a rod body section, an engagement section extended from the rod body section and accommodated in the needle seat, and a top rod section extended from the engagement section and accommodated in the fitting section, and the propping portions and the flexible brackets of the three one-way engagement units are extended from the rod body section respectively, and the engagement section and the top rod section are extended outwardly, such that when the rod is pushed backward with respect to the cylindrical body, each of the flanges abuts the corresponding flexible bracket to tilt the flexible bracket forward, and then the corresponding propping portion is blocked by the flexible bracket.

6. The syringe with a blocking structure according to claim 1, applicable in a cylindrical body with a flange disposed around the internal surface of the cylindrical body, wherein the rod has an external diameter smaller than the internal diameter of the cylindrical body, and the propping portion has an external diameter equal to the internal diameter of the flange.

7. The syringe with a blocking structure according to claim 1, wherein the flexible bracket is in a circular shape.

8. The syringe with a blocking structure according to claim 7, wherein the circular flexible bracket has a periphery formed by a plurality of hollow portions and serrated portions arranged alternately with one another.

9. The syringe with a blocking structure according to claim 1, wherein the flexible bracket is an arc bracket with a specific hardness and bent into a fingernail shape.

10. A syringe with a blocking structure, comprising:

a cylindrical body, comprising a barrel and a needle seat combined with the barrel, and a flange being formed at a middle position of the internal surface of the needle seat;

a rod, comprising a rod body section, an engagement section extended from the rod body section and accommodated in the needle seat, and a hollow cork cap covered onto the engagement section and plugged into the needle seat, wherein the engagement section has a circular groove, and a flexible bracket extended horizontally from the circular groove, and the flange having an internal diameter slightly greater than the external diameter of the flexible bracket, and the cork cap has a periphery with a thickness slightly smaller than the difference between the internal diameter of the flange and the external diameter of the flexible bracket, such that the periphery of the cork cap is protruded into the circular groove by the flange, and the protrusion has an internal diameter smaller than the external diameter of the flexible bracket, and the circular groove has a bevel extended slantingly backward from a groove wall at the rear of the flexible bracket, and the circular groove has a plane extended horizontally from a groove wall at the front of the flexible bracket;

such that the cork cap together with the engagement section are pushed forward and plugged into the needle seat, and when the flexible bracket is moved forward from the rear of the protrusion, the flexible bracket is moved by the protrusion to tilt backward, so that the flexible bracket can pass through the protrusion, and after the flexible bracket passes through the protrusion, the flexible bracket restores its original horizontal position, and when the rod is retracted from the barrel, the flexible bracket is moved backward from the front of the protrusion, and the protrusion has an internal diameter smaller than the external diameter of the flexible bracket, so that the flexible bracket blocks the protrusion and an end position of the plane, and the engagement section drives the needle seat to displace.

11. A syringe with a blocking structure, comprising:

a barrel, having a through hole formed at a front end of the barrel, and a plurality of dovetail grooves uniformly formed at an end of the through hole and in the barrel, and each dovetail groove passing from the barrel into an end of the through hole axially, and a barrel inverted hook plate disposed deeply into each dovetail groove in the barrel and at a position further than the internal side of the dovetail groove, and each barrel inverted hook plate extended in a direction slightly downwardly towards the through hole and warped to the outside, and each barrel inverted hook plate having a dovetail member disposed at an end and installed into the corresponding dovetail groove;

a circular body, with a square cross-section and a specific compressibility, and disposed in the barrel and at the bottom of an end of the through hole;

a needle seat, disposed at an end of the through hole of the barrel, and having a head holder section and a fitting section, and the periphery of the head holder section having a first circular portion and a second circular portion, and a circular groove being formed between the first circular portion and the second circular portion, and the front edge of the first circular portion abutting the circular body, and when the barrel inverted hook plate is warped and extended into the circular groove and blocked by the rear edge of the first circular portion, the periphery of the second circular portion pushes away the barrel inverted hook plate and drives the dovetail member into the dovetail groove, and the head holder section at the rear of the second circular portion abuts a seal ring of the barrel, and the fitting section is extended from the head holder section to the exterior of the through hole; and

a rod, comprising a rod body section, an engagement section extended from the rod body section and accommodated in the needle seat, and a hollow cork cap covered onto the engagement section and plugged into the needle seat.