CYLINDER-PISTON UNIT WITH ADHESIVE DISC II

• US 20140249471A1
• Filed: 05/13/2014
• Published: 09/04/2014
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: LTS Lohmann Therapie-Systeme AG
• Original Assignee: LTS Lohmann Therapie-Systeme AG
• Inventors: MATUSCH, RUDOLF
• Granted Patent: US 9,415,166 B2
• Time in Patent Office: Days
• US Class Current: 604/68
• CPC Class Codes: A61M 2005/3022 Worn on the body, e.g. as patches pressure infusion of the skin patch type A61M5/14248
• CPC Class Codes: A61M 2205/19 Constructional features of carpules, syringes or blisters
• CPC Class Codes: A61M 5/30 Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
• CPC Class Codes: A61M 5/3007 with specially designed jet passages at the injector's distal end

Abstract

A cylinder-piston unit, with at least one cylinder accommodating an injection solution, at least one piston, and an adhesive coating arranged in the area of the free end face of the cylinder. The cylinder has a bottom portion, on which a discharge tube is arranged. An adhesive disc, which is displaceable in the direction of the centre line of the cylinder-piston unit between an installation position and an application position, is arranged on the discharge tube and/or on the bottom portion. On its end face directed away from the bottom portion, the adhesive disc has an adhesive coating. In the storage position, the adhesive disc has at least one sealing element or a sealing area for closing the discharge tube, the effect of which sealing element or sealing area is no longer present in the application position. In the application position, the front edge of the end face of the discharge tube protrudes at least 0.5 mm beyond the adhesive coating of the adhesive disc. A cylinder-piston unit of an injector is developed whose discharge system is suitable for safely penetrating the outer layers of skin, covered by the term “dermis”, in order to convey the injection solution into or under the skin and keep it there for a definable period of time.

Claims

1. Cylinder-piston unit (10) of a needle-free injector, including at least one cylinder (20) for accommodating an injection solution and at least one piston (80), a piston actuating ram (7) for actuating the at least one piston (80), and an adhesive coating (121) arranged in the area of a free end face of the cylinder (20), the improvement which comprises:

the cylinder (20) has a bottom portion (33), on which a discharge tube (54, 55) is arranged,

an elastic adhesive disc (110), which is displaceable in the direction of a centre line (5) of the cylinder-piston unit (10) between an installation position (111) and an application position (112), is arranged on the discharge tube (54, 55) and/or on the bottom portion (33),

the elastic adhesive disc (110), on its end face (113) directed away from the bottom portion (33), has the adhesive coating (121) for affixing to the skin (200) of a patient,

the elastic adhesive disc (110), in the installation position (111), has at least one sealing element (116) or a sealing area (117) for closing the discharge tube (54, 55), and in the application position (112) the closing effect of the sealing element (116) or sealing area (117) is no longer present,

a front edge (59) of a free end face (58) of the discharge tube (54, 55), in the application position (112) protrudes at least 0.5 mm beyond the adhesive coating (121) of the elastic adhesive disc (110), for indenting the skin (200) of a patient without damaging the patient'"'"'s skin,

the at least one piston (80) upon actuation for causing an expansion of the elastic adhesive disc (110) and/or the protrusion of the discharge tube (54, 55) for tensioning the skin (200) of the patient, and

the elastic adhesive disc (110), remaining on the skin (200) of the patient after the cylinder-piston unit has been taken away, can be removed separately.

2. Cylinder-piston unit with adhesive disc according to claim 1, wherein the elastic adhesive disc (110) located in the installation position (111) is at a distance of at least one millimetre from a front end face (46) of the bottom portion (33) directed towards it.

3. Cylinder-piston unit with adhesive disc according to claim 1, wherein the elastic adhesive disc (110), in the application position (112), bears on a front end face (46) of the bottom portion (33).

4. Cylinder-piston unit with adhesive disc according to claim 1, wherein the outer wall (57) of the discharge tube (54, 55) is shaped cylindrically at least in part.

5. Cylinder-piston unit with adhesive disc according to claim 1, wherein the bottom portion (33) has an annular web (51), which extends forwards in a continuation of the outer wall (32) of the cylinder (20).

6. Cylinder-piston unit with adhesive disc according to claim 5, wherein the annular web (51) has a cylindrical inner wall (52).

7. Cylinder-piston unit with adhesive disc according to claim 1, wherein the elastic adhesive disc (110) has two bores (126) and (127) which lie coaxially one behind the other and which are separated by a sealing element (116) in the form of a membrane.