Automatic retractable lancet assembly

• US 4,535,769 A
• Filed: 01/20/1984
• Issued: 08/20/1985
• Est. Priority Date: 03/23/1981
• Status: Expired due to Term

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Burns, James A.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US06/572,339
• Time in Patent Office: 578 Days
• Field of Search: 128/329 R, 128/314, 128/315, 128/329 A, 128/330, 128/638, 128/770, 128/637, 604/156, 604/157, 604/136, 604/137, 604/46, 604/47
• US Class Current: 606/182
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150908 by disconnecting components, e.g. breaking or rupturing of connected parts, e.g. piston and rod
• CPC Class Codes: A61B 5/15113 Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/1513 comprising linear sliding guides comprising tooth-shaped elements A61B5/15132
• CPC Class Codes: A61B 5/15144 comprising driving means, e.g. a spring, for retracting the piercing unit into the housing

Abstract

An automatic retractable lancet assembly includes a housing with a sharp-pointed lancet movably mounted therein. A depressible plunger and slide mechanism actuates the movement of the lancet outwardly from the housing. After this outward movement is completed, the actuator elements become dissociated from further movement of the lancet. Subsequently, the lancet is automatically retracted back inside the housing by virtue of a spring element.

Claims

1. An automatic retractable lancet assembly comprising

a housing having an aperture;

a lancet mounted for movement in said housing with its point lying substantially adjacent the interior side of said aperture;

a first spring mounted inside said housing in a substantially relaxed condition and adapted to be compressed in a biased condition and further adapted to decompress upon release to cause the movement of said lancet point outward of said aperture for penetration of the skin of a patient;

said first spring adapted to become dissociated from further movement of said lancet after said lancet completes its outward movement;

actuating means for compressing said first spring into a biased condition;

latching means connected to said actuating means for retaining said first spring in said biased condition until use;

release means slidable through said housing for releasing said first spring from its biased condition;

said release means including a sharp point for permanently severing said latching means;

a second spring inside said housing in a substantially relaxed condition before said first spring is released and adapted to become biased when said first spring becomes dissociated from further movement of said lancet to cause said lancet point to be automatically retracted back inside said housing.

2. The assembly of claim 1, wherein said first and second springs are leaf springs.

3. The assembly of claim 2 wherein said housing and said springs are formed of plastic material.

4. The assembly of claim 2 wherein said housing and said springs are formed as an integral, unitary structure.