Automatic injection for syringe needle, and assembly

• US 4,601,708 A
• Filed: 09/09/1985
• Issued: 07/22/1986
• Est. Priority Date: 09/09/1985
• Status: Expired due to Fees

• Current Assignee: Pavel Jordan & Associates
• Original Assignee: Pavel Jordan & Associates
• Inventors: Jordan, Pavel
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/773,573
• Time in Patent Office: 316 Days
• Field of Search: 604/136, 604/134, 604/135, 604/186
• US Class Current: 604/136
• 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 injector device for a syringe and assembly is disclosed which enables the user to inject a syringe needle to a predetermined depth.

The device includes a pipe union bearing upper retaining arms that are adapted to interfit with a plunger of a standard injector syringe. The pipe union is slidably mounted along an inner tube through which the syringe and needle are projected. The pipe union and an attached screw nut form upper and lower shoulders along the inner tube. The pipe union is spring loaded for movement along the inner tube, and this movement is set between the upper and lower shoulders by means of a rotatable firing hammer. The hammer fixes the pipe union and attached syringe in the upper, spring loaded position, and when triggered, the hammer releases the pipe union to the lower position and fires the syringe needle into the user. A lower adjustable tube partly encloses the inner tube, and provides a lower flat surface that contacts the user'"'"'s body and enables the needle to be applied at the desired location.

Claims

1. An injection device for a syringe and needle, comprising

a. an inner tube for guiding a syringe and needle assembly therethrough, the inner tube including an outer surface and providing a hammer holder mounted on the tube surface, and a hammer rotatably mounted by the hammer holder, the hammer defining a stop end, and means for securing a spring loading element disposed on said tube;

b. a spring loading element secured at one end of the tube;

c. a pipe union providing upper arms for engagement with a syringe plunger, the pipe union being slidably mounted along the outer surface of the inner tube, and attached to the inner tube by the spring element, and being upwardly biased by said spring, the pipe union extending outwardly from the tube surface to define a peripheral shoulder;

d. a stop nut mounted upwardly of the pipe union and adjacent to the upper engagement arms, and providing an outwardly extending shoulder peripherally of the outer tube surface, the stop nut being adapted for rotation to secure and release the plunger and upper arms of the pipe union; and

,

e. an outer tube surrounding a portion of the inner tube, and being adjustably mounted thereon, the outer tube defining a flat end surface for pressing against a user'"'"'s body and providing a stable platform for projection of the needle therefrom;

whereby;

i. when the injection device is biased upwardly along the inner tube in a loaded position, the hammer at the stop end is adapted to bear against the shoulder of the pipe union and maintain the injector in the loaded position;

ii. when the hammer if tripped, the union tube is released and biased downwardly by the spring, thereby projecting the attached syringe and needle in a uniform manner along the inner tube;

iii. when the hammer at the stop end contacts the shoulder of the stop nut, the pipe union will be restrained from further movement; and

, iv. the adjustable mounting of the outer tube along the inner tube provides a projection length of the needle beyond the flat end of the outer tube, which is uniform from injection to injection.

2. The injection device of claim 1, in which a peripheral groove is defined around the outer tube surface, and the spring loading element is secured at one end within the groove.

3. The injection device of claim 1, in which a threaded hole is provided in the inner tube, and a longitudinal slot is provided along the outer tube, the inner and outer tubes being secured by a screw which passes through the slot and into the hole. the inner and outer tubes being adapted to move relative to each other by loosening the screw and adjustment of the tubes along the slot.

4. An assembly of an injection device and a syringe and needle, comprising:

a. a syringe and needle, including a syringe plunger element;

b. an inner tube for guiding the syringe and needle therethrough, the inner tube including an outer surface and providing a hammer holder mounted on the tube surface, and a hammer rotatably mounted by the hammer holder, the hammer defining a stop end, and means for securing a spring loading element disposed on said tube;

c. a spring loading element secured at one end of the tube;

d. a pipe union providing upper arms for engagement with a syringe plunger, the pipe union being slidably mounted along the outer surface of the inner tube, and attached to the inner tube by the spring element, and being upwardly biased by said spring, the pipe union extending outwardly from the tube surface to define a peripheral shoulder;

e. a stop nut mounted upwardly of the pipe union and adjacent to the upper engagement arms, and providing an outwardly extending shoulder peripherally of the outer tube surface, the stop nut being adapted for rotation to secure and release the plunger and upper arms of the pipe union; and

,

f. an outer tube surrounding a portion of the inner tube, and being adjustably mounted thereon, the outer tube defining a flat end surface for pressing against a user'"'"'s body and providing a stable platform for projection of the needle therefrom;

whereby;

i. when the injection device is biased upwardly along the inner tube in a loaded position, the hammer at the stop end is adapted to bear against the shoulder of the pipe union and maintain the injector in the loaded position;

ii. when the hammer is tripped, the union tube is released and biased downwardly by the spring, thereby projecting the attached syringe and needle in a uniform manner along the inner tube;

iii. when the hammer at the stop end contacts the shoulder of the stop nut, the pipe union will be restrained from further movement; and

, iv. the adjustable mounting of the outer tube along the inner tube provides a projection length of the needle beyond the flat end of the outer tube, which is uniform from injection to injection.

5. The injection device of claim 4, in which a peripheral groove is defined around the outer tube surface, and the spring loading element is secured at one end within the groove.

6. The injection device of claim 4, in which a threaded hole is provided in the inner tube, and a longitudinal slot is provided along the outer tube, the inner and outer tubes being secured by a screw which passes through the slot and into the hole, the inner and outer tubes being adapted to move relative to each other by loosening the screw and adjustment of the tubes along the slot.

7. A method for injecting a syringe and needle included in an assembly of an injection device, the assembly comprising:

a. a syringe and needle, including a syringe plunger element;

b. an inner tube for guiding the syringe and needle therethrough, the inner tube including an outer surface and providing a hammer holder mounted on the tube surface, and a hammer rotatably mounted by the hammer holder, the hammer defining a stop end, and means for securing a spring loading element disposed on said tube;

c. a spring loading element secured at one end of the tube;

d. a pipe union providing upper arms for engagement with a syringe plunger, the pipe union being slidably mounted along the outer surface of the inner tube, and attached to the inner tube by the spring element, and being upwardly biased by said spring, the pipe union extending outwardly from the tube surface to define a peripheral shoulder;

e. a stop nut mounted upwardly of the pipe union and adjacent to the upper engagement arms, and providing an outwardly extending shoulder peripherally of the outer tube surface, the stop nut being adapted for rotation to secure and release the plunger and upper arms of the pipe union; and

,

f. an outer tube surrounding a portion of the inner tube, and being adjustably mounted thereon, the outer tube defining a flat end surface for pressing against a user'"'"'s body and providing a stable platform for projection of the needle therefrom;

the method comprising;

i. upwardly biasing the injection device along the inner tube in a loaded position, the hammer at the stop end being adapted to bear against the shoulder of the pipe union and maintain the injector in the loaded position;

ii. tripping the hammer, the union tube being released and biased downwardly by the spring, thereby projecting the attached syringe and needle in a uniform manner along the inner tube;

iii. contacting the hammer at the stop end with the shoulder of the stop nut, thereby restraining the pipe union from further movement; and

, providing a projection length of the needle beyond the flat end of the outer tube, which is uniform from injection to injection, by means of the adjustable mounting of the outer tube along the inner tube.

8. The method of claim 7, in which a peripheral groove is defined around the outer tube surface, and the spring loading element is secured at one end within the groove.

9. The method of claim 8, in which a threaded hole is provided in the inner tube, and a longitudinal slot is provided along the outer tube, the inner and outer tubes being secured by a screw which passes through the slot and into the hole, the inner and outer tubes being adapted to move relative to each other by loosening the screw and adjustment of the tubes along the slot.