Safety syringe having a manually activated retractable needle

Patent metadata

Field	Value
Publication number	US-9849251-B2
Application number	US-201213492245-A
Country	US
Kind code	B2
Filing date	Jun 8, 2012
Priority date	Jun 8, 2011
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A retractable needle assembly includes a housing having a sidewall defining a hollow bore, and an elongate plunger, the distal end of the plunger forming a reservoir within the hollow bore for containing a fluid therein. The plunger is adapted for slideable movement within the hollow bore. The assembly includes a hub disposed within the hollow bore and at least partially supporting a cannula therewith, and a needle retraction member engaged with the hub for manually selectable advancement with respect to a portion of the housing. The needle retraction member may be advanced from an initial position in which at least a portion of the needle is disposed outside the housing, to a retracted position in which the needle is fully surrounded by the housing. The elongate plunger may be advanced about the hub for extracting the fluid into the reservoir or expelling the fluid from the reservoir.

First claim

What is claimed is:

1. A retractable needle assembly for fluid collection, comprising:
a housing comprising:
a proximal end and a distal end,
a sidewall having a longitudinal groove defined within a portion of the sidewall, and
a hollow bore extending between the proximal end and the distal end of the housing;

an elongate plunger having a proximal end and a distal end, the distal end of the plunger defining a reservoir within the hollow bore for containing a fluid within the reservoir, the plunger adapted for slideable movement within the hollow bore from a deployed position in which the distal end of the plunger contacts the distal end of the housing to a maximum draw position;
a hub disposed at least partially within the hollow bore, wherein a cannula is connected to a portion of the hub;
a stopper connected to the distal end of the elongate plunger and slidably advanceable within the hollow bore to form a substantially fluid-tight seal with the hollow bore, the stopper disposed within the hollow bore at a location entirely distal to the hub; and
a needle retraction member, for manually selectable advancement of the cannula with respect to a portion of the housing, engaged with the hub,
wherein the needle retraction member may be advanced from an initial position in which at least a portion of the cannula is disposed outside the housing, to a retracted position in which the cannula is fully surrounded by the housing, wherein in the initial position and the retracted position the needle retraction member is aligned within the longitudinal groove,
wherein the elongate plunger may be advanced about at least a portion of the hub for extracting the fluid into the reservoir or expelling the fluid from the reservoir, and wherein once the needle retraction member is transitioned to the retracted position, the hub and the needle cannula remain stationary within the bore with respect to the housing throughout redeployment of the plunger to the deployed position.

2. The retractable needle assembly of claim 1 , wherein the needle retraction member extends at least partially through a portion of the sidewall of the housing.

3. The retractable needle assembly of claim 1 , wherein the hub and the needle retraction member are co-formed.

4. The retractable needle assembly of claim 1 , further comprising a seal disposed within the hollow bore and positioned about a portion of the cannula when the cannula is in the initial position so as to form a fluid-tight chamber within the reservoir.

5. The retractable needle assembly of claim 4 , wherein the cannula comprises a break surrounded by the reservoir to allow for fluid entering the cannula to pass into the reservoir.

6. The retractable needle assembly of claim 1 , wherein retraction of the elongate plunger from an initial position in which the plunger is substantially disposed within the hollow bore, to a retracted position in which the plunger is substantially disposed exterior to the hollow bore, induces a vacuum within the reservoir to draw fluid into the reservoir.

7. The retractable needle assembly of claim 6 , wherein transition of the needle retraction member from the initial position to the retracted position permits redeployment of the elongate plunger within the hollow bore to expel fluid from the reservoir.

8. The retractable needle assembly of claim 1 , wherein the elongate plunger comprises a pair of depending arms, with each arm comprising a protrusion slideably disposed within a corresponding side groove defined within the sidewall of the housing, each side groove spaced from the longitudinal groove.

9. The retractable needle assembly of claim 1 , further comprising a lock for preventing re-deployment of the needle retraction member once the needle retraction member has been transitioned from the initial position to the retracted position.

10. The retractable needle assembly of claim 1 , wherein the elongate plunger comprises a plurality of ramped stops disposed about a length of the plunger extending between the distal end and the proximal end of the elongate plunger, and wherein the proximal end of the housing defines at least one restraint adapted to receive a ramped stop, such that advancement of the plunger with respect to the proximal end of the housing in the proximal direction is permitted and advancement of the plunger with respect to the proximal end of the housing in the distal direction is restrained by the interaction of at least one ramped stop and at least one restraint.

11. The retractable needle assembly of claim 10 , wherein the needle retraction member further comprises at least one flange adapted to contact at least one protrusion when the elongate plunger is in a fully retracted position to permit re-deployment of the plunger within the hollow bore.

12. The retractable needle assembly of claim 1 , wherein the distal end of the housing includes a flash chamber for indicating venous access.

Assignees

• Crawford Jamieson W
• Ellis Robert G
• Becton Dickinson Co

Inventors

• Crawford Jamieson W
• Ellis Robert G

Classifications

• A61M5/3293

  characterised by features of the needle hub · CPC title

• A61B5/150244

  Rods for actuating or driving the piston, i.e. the cylindrical body that sits inside the syringe barrel, typically with an air tight seal, and slides in the barrel to create a vacuum or to expel blood · CPC title

• A61B5/150519

  Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device · CPC title

• A61B5/150404

  Specific design of proximal end · CPC title

• A61B5/15003

  for venous or arterial blood · CPC title