Device for expelling a liquid or pasty substance

• US 20060264838A1
• Filed: 07/15/2004
• Published: 11/23/2006
• Est. Priority Date: 07/16/2003
• Status: Abandoned Application

• Current Assignee: David Weill
• Original Assignee: David Weill
• Inventors: Volckmann, Jean-Claude, Rosset, Yannick
• Application Number:
  US10/564,247
• Publication Number:
  US 20060264838A1
• Time in Patent Office: Days
• US Class Current: 604/209
• CPC Class Codes: A61C 5/62 Applicators, e.g. syringes or guns
• 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 5/31505 Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit
• CPC Class Codes: A61M 5/31581 performed by rotationally moving or pivoting actuator operated by user, e.g. an injection lever or handle
• CPC Class Codes: A61M 5/31595 Pre-defined multi-dose administration by repeated overcoming of means blocking the free advancing movement of piston rod, e.g. by tearing or de-blocking

Abstract

The device (1) for ejecting a liquid or pasty product, comprises a body (2), a part intended to contain the product and equipped with an orifice for ejecting the product, a drive cylinder (3) equipped with teeth (10), moving in a bore (23) passing through the body and causing the volume of the part intended to contain the product to vary and a mechanism for displacing the drive cylinder attached to the body, and comprises an articulated lever (4) acting on the teeth of the drive cylinder through an articulated pawl (16) articulated to the lever (4) and returned to a position of contact with the drive cylinder and a nonreturn pawl (18) returned to a position of contact with the drive cylinder. It is one wherein the lever (4) is connected to the body by means of a joint (14, 15) that can be dislocated.

Claims

1. A device (1) for ejecting a liquid or pasty product, comprising a body (2), a part intended to contain the product and equipped with an orifice for ejecting the product, a drive cylinder (3;

3′

;

3″

) equipped with teeth (10), moving in a bore (23) passing through the body and causing the volume of the part intended to contain the product to vary and a mechanism for displacing the drive cylinder attached to the body, comprising an articulated lever (4) acting on the teeth of the drive cylinder through an articulated pawl (16) articulated to the lever (4) and returned to a position of contact with the drive cylinder and a nonreturn pawl (18) returned to a position of contact with the drive cylinder, wherein the lever (4) is connected to the body by means of a joint (14, 15) that can be dislocated.

2. The ejection device (1) as claimed in claim 1, wherein the drive cylinder (3;

3′

;

3″

) has one end (22) shaped to engage in a slot (20) formed on the nonreturn pawl (18) when the latter is engaged the wrong way round in the body (2).

3. The ejection device (1) as claimed in claim 1, wherein the drive cylinder (3′

;

3″

) has a sector with no teeth along its entire length and is able to rotate in the bore (23).

4. The ejection device (1) as claimed in claim 1, wherein the profile of the teeth (10) between two consecutive crests comprises two straight segments (11, 13) connected by a radius (12).

5. The ejection device (1) as claimed in claim 1, and which comprises, in the body (2), a liner (25) able to rotate with respect to the body.

6. The ejection device (1) as claimed in claim 5, wherein the liner comprises an elastically deformable part (27) constituting the nonreturn pawl.

7. The ejection device (1) as claimed in claim 5, wherein the liner comprises at least one stud designed to act on at least one pawl and to release the drive cylinder as the liner turns.

8. The ejection device (1) as claimed in claim 1, and which comprises, in the body (2), a liner (25) capable of translational movement with respect to the body (2) and wherein the liner comprises at least one stud designed to act on at least one pawl and release the drive cylinder as the liner effects a translational movement.

9. The ejection device (1) as claimed in claim 5, wherein the liner comprises a means of connection to the part intended to contain the product.

10. The ejection device (1) as claimed in claim 1, wherein the body (2) and/or the lever (4) are made of a material that can be molded.