Needle assembly

• US 4,435,176 A
• Filed: 02/09/1982
• Issued: 03/06/1984
• Est. Priority Date: 10/22/1981
• Status: Expired due to Fees

• Current Assignee: Soji Ishikawa
• Original Assignee: Soji Ishikawa
• Inventors: Ishikawa, Soji
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/347,160
• Time in Patent Office: 756 Days
• Field of Search: 604/188, 604/190, 604/206, 604/239, 604/240
• US Class Current: 604/190
• CPC Class Codes: A61M 5/3145 Filters incorporated in syringes
• CPC Class Codes: A61M 5/34 Constructions for connecting the needle , e.g. to syringe nozzle or needle hub connecting catheter tubes to hubs A61M25/0014

Abstract

A needle assembly for use with a hypodermic syringe having a snout, which comprises a needle, a needle holder having a flare bore section for coupling with the snout of the syringe and a hollow pipe provided in the flared bore section of the needle holder. The pipe is shaped and sized to be inserted in a snout hole when the needle holder couples with the snout through the flared bore section formed therein. The pipe has a passage which communicates with a needle bore through a narrow hole formed in the needle holder. A filter may be provided in the needle holder. The quantity of liquid medicine left in the needle holder and the snout hole of the syringe after the injection is made extremely small. When the filter is provided in the needle holder, impurities can be removed.

Claims

1. A needle assembly for use with a hypodermic syringe including a syringe barrel with a snout formed at its leading end, said snout being tapered towards its tip end and having a hole therein, which comprises:

a needle having a longitudinal bore extending throughout its length;

a needle holder receiving the needle at its one end and having a flared bore therein at its other end, said flared bore being shaped and sized to be press fitted over the tapered snout of the syringe barrel, said needle holder having a narrow hole in the needle receiving section which communicates with the flared bore;

a hollow pipe fixed in the flared bore at the innermost area thereof by means of a bulged portion formed at a base thereof, said pipe being shaped and sized to be inserted in the snout hold and having a passage which communicates with the needle bore through the narrow hole in the needle holder; and

a plate-like filter provided at the area in the needle holder which communicates with the needle and the pipe, the filter being carried by annular projections formed on the end walls of the pipe and the flared bore of the needle holder.

2. A needle assembly for use with a hypodermic syringe including a syringe barrel with a snout formed at its leading end, said snout being tapered towards its tip end and having a hole therein, which comprises:

a needle having a longitudinal bore extending throughout its length;

a needle holder receiving the needle at its one end and having a flared bore therein at its other end, said flared bore being shaped and sized to be press fitted over the tapered snout of the syringe barrel, said needle holder having a narrow hole in the needle receiving section which communicates with the flared bore;

a hollow pipe fixed in the flared bore at the innermost area thereof by means of a bulged portion formed at a base thereof, said pipe being shaped and sized to be inserted in the snout hole and having a passage which communicates with the needle bore through the narrow hole in the needle holder, the bulged portion being shaped and sized to define an empty space between an outer end thereof and the tapered end of the snout.

3. A needle assembly as defined in claim 2, wherein a filter is provided at the area in the needle holder which communicates with the needle and the small pipe.