Multiple implant injector

• US 4,661,103 A
• Filed: 03/03/1986
• Issued: 04/28/1987
• Est. Priority Date: 03/03/1986
• Status: Expired due to Fees

• Current Assignee: Endocon, Inc.
• Original Assignee: Engineering Development Associates, Ltd.
• Inventors: Harman, S. Mitchell
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/835,369
• Time in Patent Office: 421 Days
• Field of Search: 604/60-64, 604/59, 221/186, 221/187, 221/198, 221/232
• US Class Current: 604/62
• CPC Class Codes: A61M 37/0069 Devices for implanting pellets, e.g. markers or solid medicaments for introducing of radioactive sources for interstitial radiation therapy, i.e. brachytherapy A61N5/1027

Abstract

An improved magazine type implant injector having a slotted barrel element slidably mounting an integral magazine element and cannula. The barrel element mounts an obturator which projects into the magazine element to serially advance elongated implants to the cannula, each implant advancing a previously engaged implant through the distal end of the cannula for implantation.

Claims

1. An improved multiple medicinal implant injector comprising:

a hollow cannula having distal and proximal ends, an elongated implant magazine element having an elongated hollow hub member thereon defining a through bore extending between first and second ends thereof, one of said ends having means thereon engaging said proximal end of said cannula;

said magazine element having a hollow laterally extending shell defining a void for retaining elongated implants in stacked relation;

an elongated hollow barrel element having a distal end and a closed proximal end, an elongated obturator supported at one end thereof by said closed end of said barrel element, and having an effective length approximating that of an implant;

said barrel element having an axially disposed slot therein having first and second transversely extending surfaces, said magazine element being slidably positioned within said barrel element with said shell projecting through said slot for reciprocating movement between first and second positions defined by said transversely extending surfaces; and

a plurality of implants positioned in stacked relation within said shell whereby reciprocating movement of said magazine element between said first and second positions serves to move said obturator from beneath stacked implants within said shell to permit successive implants to be aligned with said cannula, subsequent movement of said barrel serving to cause said cannula to move successive implants into the proximal end of said cannula, each successive implant transmitting motion to the immediately proceding implant to result in said implants being moved outwardly of said cannula through the distal end thereof.

2. An injector in accordance with claim 1, further comprising a spring member surrounding said obturator and serving to resiliently urge said magazine element to one of said positions relative to said barrel element, wherein said obturator is withdrawn from beneath said implants in said shell.

3. An injector in accordance with claim 2, further comprising manually engageable grips on outer surfaces of said shell to facilitate one handed operation.

4. An injector in accordance with claim 1, further characterized in said slot in said base element having a third transversely extending surface, said magazine element being rotatable relative to said barrel to prevent unintentional relative axial movement therebetween.

5. An injector in accordance with claim 1, further characterized in said magazine element being integrally moulded from synthetic resinous materials.