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Cylinder-piston unit with adhesive disc II

  • US 9,415,166 B2
  • Filed: 05/13/2014
  • Issued: 08/16/2016
  • Est. Priority Date: 11/16/2011
  • Status: Active Grant
First Claim
Patent Images

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 rain (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, the bottom portion (33) of the cylinder (20) has a front end face (46),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 slidably arranged on the discharge tube (54, 55) and/or on the bottom portion (33), the bottom portion (33) has an annular web (51), which extends forwards in a continuation of the outer wall (32) of the cylinder (20), the annular web (51) has a cylindrical inner wall (52), the annular web (51) encloses a receiving space (53) for the elastic adhesive disc (110), the elastic adhesive disc (110) slideable within the receiving space (53), the elastic adhesive disc (110) in the installation position (111) having a first portion thereof occupying a front area of the receiving space (53) with the remainder of the receiving space (53) being unoccupied between the front end face (46) of the bottom portion (33) of the cylinder (20) and the elastic adhesive disc (110) and a second portion of the elastic adhesive disc (110) extending beyond the cylindrical inner wall (52), upon actuation of the at least one piston (80) the elastic adhesive disc (110) slips further into the receiving space (83), in the application position (112) the receiving space (53) being now fully occupied by the slideable elastic adhesive disc (110) with a third portion thereof extending beyond the cylindrical inner wall (52), the elastic adhesive disc (110) in the application position (112) bears on the front end face (46) of 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, andthe 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.

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