Implant gun

• US 4,223,674 A
• Filed: 06/29/1978
• Issued: 09/23/1980
• Est. Priority Date: 06/29/1978
• Status: Expired due to Term

• Current Assignee: Arthur J. Mcintosh
• Original Assignee: Arthur J. Mcintosh
• Inventors: Fluent, Stewart L., Foley, Dan R.
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US05/920,381
• Time in Patent Office: 817 Days
• Field of Search: 128/217, 128/213, 128/221, 128/260
• US Class Current: 604/507
• 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
• CPC Class Codes: A61M 5/3286 Needle tip design, e.g. for improved penetration

Abstract

An implant gun for depositing pellets or the like subcutaneously. The gun includes a hollow needle through which a number of pellets are dispensed from a cartridge that is positioned either inside the needle or in an ante-chamber. The action of the gun is such that the pellets are gently deposited in the tissue as the needle is withdrawn from the cavity formed in the tissue at the time the needle was inserted. This technique practically eliminates any breaking of the fragile pellets and reduces the trauma of their insertion into the tissue. The implant gun also includes a unique ram activating mechanism that frees one of the hands of the operator so that the implanting procedure can be conducted without assistance. The implant gun is also easily adapted for use in implanting single items other than pellets, such as identification tags for animals.

Claims

1. An implant gun for depositing items such as pellets, identification means and the like subcutaneously, said implant gun comprising a movable carrier, a hollow needle extending from the forward end of said carrier and movable therewith for creating a cavity in the tissue at the implant site when said needle is inserted into said tissue, means for retaining the item to be implanted in position for implanting through said needle, ram means extending into said carrier and engagable with said item, said ram means and said carrier being relatively movable generally forwardly and rearwardly, and operating means for moving said needle and carrier rearwardly while holding said ram means stationary relative to the implant site so as to withdraw said needle from the implant site while holding the item to be implanted in the cavity created at the implant site as said needle is withdrawn.

2. The implant gun of claim 1 in which said carrier includes means located rearwardly of said needle for receiving a holder of a plurality of items to be implanted, said holder being received in said means so as to position an item for implanting through said needle.

3. The implant gun of claim 2 in which said means for receiving a holder of a plurality of items is adapted to receive a revolving cylinder having a plurality of chambers into which the items to be implanted can be inserted.

4. The implant gun of claim 2 in which said means for receiving a holder for a plurality of items is adapted to receive a cartridge having a chamber holding a plurality of items one on top of the other for depositing said items one by one from said chamber.

5. The implant gun of claim 1 in which said operating means includes an intermediate member slidably movable forwardly and rearwardly relative to said main body, and said ram means is affixed to and movable with said intermediate member.

6. The implant gun of claim 5 in which said operating means includes a handle slidably movable forwardly and rearwardly relative to said intermediate member, and connecting means interconnect said main body, intermediate member and handle so that as said handle moves forwardly relative to said intermediate member said main body moves rearwardly relative to said intermediate member, and as said handle moves rearwardly said main body moves forwardly.

7. The implant gun of claim 6 in which said connecting means includes an endless continuous path formed in said intermediate member, a first guide member is affixed to said main body and extends into said path, a second guide member is affixed to said handle and extends into said path, and means in said path interconnecting said first and second guide members so that movement of one of said guide members produces movement of said other guide member in an opposite direction.

8. The implant gun of claim 7 in which said path has an upper portion and a lower portion, and said first guide member extends into said upper portion and said second guide member extends into said lower portion.

9. The implant gun of claim 8 in which said path is filled with a plurality of rollable members freely movable in said path.

10. The implant gun of claim 1 in which said operating means includes a handle slidably movable forwardly and rearwardly relative to said carrier, said ram means being affixed to said handle.

11. The implant gun of claims 1, 5, 6, 7, 8, 9, or 10 in which said operating means includes locking means to selectively prevent relative movement between said carrier and said ram means.

12. The implant gun of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 in which the item to be implanted is a plurality of pellets contained in a cartridge, and said hollow needle has an interior diameter larger than the exterior diameter of said cartridge so as to receive said cartridge inside of said needle while allowing discharge of said pellets from said cartridge and needle.

13. The implant gun of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 in which the item to be implant is a plurality of individual pellets contained in a cartridge, and said hollow needle has an interior diameter larger than the exterior diameter of said pellets but smaller than the exterior diameter of said cartridge so that said cartridge remains rearwardly of said needle.

14. A method of implanting items subcutaneously, said method comprising:

inserting a hollow needle containing the item to be implanted into the tissue at the implant site to create a cavity at said site; and

holding said item stationary relative to said cavity while withdrawing said needle from the implant site so that said item remains in said cavity while said needle is withdrawn.

15. The method of claim 14 wherein a plurality of items are contained in said needle and are implanted in said cavity as said needle is withdrawn.