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Injection port for single-use syringe

  • US 5,222,948 A
  • Filed: 09/09/1991
  • Issued: 06/29/1993
  • Est. Priority Date: 09/09/1991
  • Status: Expired due to Term
First Claim
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1. An injection port assembly insertable at a distal end of a prefilled medicament reservoir of a medical syringe in order to make the syringe substantially non-reusable by permitting substantial fluid flow out of the distal end of the syringe medicament reservoir and preventing substantial fluid flow into said distal end of the syringe medicament reservoir, said injection port assembly comprising:

  • a tubular wall having a proximal wall portion and a distal wall portion;

    a valve chamber in the proximal wall portion for forming a fluid-tight seal with the syringe, said valve chamber having a proximal chamber end and a distal chamber end, said distal chamber end having a central aperture for communicating with a hypodermic needle;

    a plurality of radial ribs surrounding the central aperture and extending from the central aperture to the tubular wall and defining both a central cavity extending in a proximal direction and a series of passages between the ribs, the passages communicating with the central cavity, a valve seat closing the proximal chamber end and having a valve seat surface surrounding a central opening for connecting the valve chamber with said medicament reservoir;

    a valve flap disposed in the valve chamber between the valve seat and the ribs, said valve flap being free to move between the valve seat and the ribs as pressure is applied to the valve flap by fluid entering the valve chamber, the valve flap having a diameter smaller than the inner diameter of the chamber and large enough to sealingly cover the central opening when in contact with the tubular wall of the chamber and also large enough to cover the central cavity but not all of the passages between the ribs; and

    means for positioning the injection port assembly in a syringe between a medicament reservoir and a hypodermic needle.

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