Plastic device for injection and obtaining blood samples

• US 4,858,607 A
• Filed: 10/16/1987
• Issued: 08/22/1989
• Est. Priority Date: 10/16/1987
• Status: Expired due to Fees

• Current Assignee: Pavel Jordan & Associates
• Original Assignee: Pavel Jordan & Associates
• Inventors: Muff, Janet, Jordan, Pavel, Strong, Bernard
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): Lewis, Ralph
• Application Number:
  US07/108,950
• Time in Patent Office: 676 Days
• Field of Search: 128/329 R, 128/314, 604/134, 604/136-138, 604/117, 604/156, 604/157
• 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 5/15113 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 5/15194 fully automatically retracted, i.e. the retraction does not require a deliberate action by the user, e.g. by terminating the contact with the patient's skin
• CPC Class Codes: A61M 2205/585 having magnification means, e.g. magnifying glasses
• CPC Class Codes: A61M 5/3287 Accessories for bringing the needle into the body; Automatic needle insertion A61M5/20, A61M5/31525 take precedence
• CPC Class Codes: A61M 5/46 having means for controlling depth of insertion

Abstract

An inexpensive injection device is provided which is manufactured of plastic components, and is adapted to fit various syringe sizes. The injection device is spring loaded, and provides a firing barrel which, in the cocked position, is offset slightly from the central bore of the device.

When the device is fired, the firing barrel is aligned with the central bore and projects the needle portion of the syringe into the user.

For obtaining blood samples, the syringe is replaced by a striker element, which actuates a spring loaded puncture module which punctures the skin and is quickly withdrawn.

Claims

1. A plastic injection device comprising:

a. an elongate, exterior hollow barrel;

b. a hollow, cylindrically-shaped depth gage means having a rearward end slidably received within the forward end of the exterior barrel such that the forward end of the depth gage means protrudes from the barrel;

c. a cylindrically-shaped spring loaded firing barrel, including first spring loading means positioned at the rearward end of the exterior barrel for projecting the firing barrel forward, the spring loading means of the firing barrel being axially disposed between the firing barrel and the exterior barrel;

d. an inwardly biased, spring loaded sleeve, including second spring loading means, said sleeve being mounted rearwardly and within the exterior barrel, the forward end of the firing barrel when cocked, resting on the said sleeve;

e. an inwardly moveable firing button mounted on the exterior barrel for biasing the spring loaded sleeve outwardly against the force of the second spring loading means, the firing button being positioned opposed to the second spring loading means of the said sleeve;

f. striker holder means mounted at the rearward end of the firing barrel for removeable attachment with a lancet striker means;

g. spring loading means to maintain a lancet striker under tension on the striker holder means; and

,

h. a lancet module removably mounted at the forward end of the depth gage, the module comprising a rearwardly biased lancet holder, including a spring biasing means adapted to support a removeable lancet mounting and attached lancet;

whereby;

i. when the firing barrel is retracted against the force of the first spring loading means, it rests in a cocked position, on the spring loaded sleeve;

ii. when the firing button is depressed inwardly, it outwardly biases the spring loaded sleeve and dislodges the firing barrel and thereby projects the lancet striker through the exterior barrel and depth gage to impact the lancet module against the force of the lancet spring biasing means, and thereby projects the lancet module forwardly and punctures a user'"'"'s skin with the lancet;

iii. the depth gage aligns the striker as it passes therethrough and adjusts the puncture depth of the lancet needle.

2. A lancet module, including a lancet needle, for producing a skin puncture and obtaining a blood sample, the module being adapted for attachment to a firing assembly, and including a hollow body portion, a rearwardly biased, spring loaded lancet holder slidably mounted within the hollow body portion and supported thereby, a lancet mounting and the attached said lancet being removovably connected to the lancet holder, whereby impact with a striker element of the firing assembly will project the lancet holder against the force of the spring loading means, and cause the lancet needle to puncture a user'"'"'s skin, and then retract to its initial firing position.