Medical seed implantation instrument

• US 5,242,373 A
• Filed: 09/17/1991
• Issued: 09/07/1993
• Est. Priority Date: 09/17/1991
• Status: Expired due to Fees

• Current Assignee: Mick, Felix W., Walter P. Scott
• Original Assignee: Mick, Felix W., Walter P. Scott
• Inventors: Mick, Felix W., Scott, Walter P.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Lacyk, John P.
• Application Number:
  US07/760,986
• Time in Patent Office: 721 Days
• Field of Search: 600/1-8, 604/60-64, 604/51, 604/59, 604/93, 604/164, 604/16-18, 128/654, 128/655, 128/659
• US Class Current: 600/7
• 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: A61N 2005/1011 Apparatus for permanent insertion of sources
• CPC Class Codes: A61N 5/1001 using radiation sources introduced into or applied onto the body; brachytherapy
• CPC Class Codes: A61N 5/1007 Arrangements or means for the introduction of sources into the body

Abstract

Medical instrument for implantation of radioactive seeds in a body, the instrument including an elongated support rod and an elongated stylet rod spaced apart from and parallel to the support rod, and being held in that relationship by a stop block and a slide block spaced apart from each other and longitudinally slidable with respect to both the support rod and the stylet rod. The stop block is attached to the support rod and the slide block is clampable to each of the support rod and the stylet rod. A seed cartridge with transverse spaced passageways and a central longitudinal through bore receives, stores, and discharges a plug of spaced radio-active seeds by the stylet rod through a connectible hollow elongated implantation needle through which the plug may be implanted in body tissue.

Claims

1. A radio-active seed implantation instrument comprising the combination of an elongated support rod having a distal end, a proximal end, and a longitudinal axis, a thin elongated stylet rod spaced apart from and parallel to said support rod, said stylet rod having a distal end, a proximal end, and a longitudinal axis;

a stop block positioned longitudinally on said support rod and said stylet rod, a slide block slidable longitudinally along said support rod and said stylet rod and having a first clamping means to clamp said slide block to said support rod at any longitudinal position along said support rod and a second clamping means to clamp said slide block to said stylet rod at any longitudinal position along said stylet rod, a hollow implantation needle having a sharpened distal end and a proximal end, and a seed cartridge having a central bore adapted to receive and store a plug containing a plurality of spaced radio-active seeds, and means for rapid attachment/detachment of said seed cartridge to said proximal end of said implantation needle, said stylet rod being slidable through said central bore of said seed cartridge to move said plug from said cartridge to said distal end of said needle.

2. The instrument of claim 1 wherein said support rod at its distal end has a shoe generally perpendicular to said support rod and adapted to rest against a flat surface to stabilize said instrument.

3. The instrument of claim 1 wherein said distal end of said support rod including means for connections to a medical instrument employed to precisely locate the internal body position for deposition of spaced radio-active seeds adapted to be loaded in said seed cartridge.

4. The instrument of claim 1 wherein said seed cartridge has a proximal portion adapted to contain a plug containing a plurality of spaced radio-active seeds and a distal portion containing said rapid attachment/detachment means.

5. The instrument of claim 4 wherein said seed cartridge portions are coupled together by screw threads in each portion.

6. The instrument of claim 1 wherein said implantation needle includes a flange means at its proximal end adapted to be engaged by said rapid attachment/detachment means in said seed cartridge.

7. The instrument of claim 1 wherein said cartridge has an outer jacket of stainless steel and an inner core of a polyfluorocarbon.

8. A radio-active seed implantation instrument having a proximal end and a distal end and comprising the combination of a stylet plunger and a seed cartridge;

said stylet plunger including an elongated support rod and an elongated stylet rod spaced apart from and parallel to said support rod and maintained in that spaced parallel relationship by a stop block and a slide block spaced apart longitudinally on said support rod and said stylet rod respectively, said slide block being located between said stop block and said proximal end of the instrument and having a first clamping means to selectively clamp said slide block to said support rod at any position between said stop block and said proximal end, and having a second clamping means to selectively clamp said slide block to said stylet rod at any position along said stylet rod, and said seed cartridge being a container with a longitudinal through bore adapted to receive and store a plug of spaced radio-active seeds, and said stylet rod and said seed cartridge being positioned such that said stylet rod is slidable through said longitudinal through bore of said seed cartridge.

9. The instrument of claim 8 wherein said cartridge has a stainless steel outer jacket and a core of a polyfluorocarbon.

10. The instrument of claim 8 wherein said support rod includes means adjacent said distal end to stabilize said support rod against lateral movement.

11. The instrument of claim 10 wherein said means to stabilize is a base with a flat support surface attached perpendicular to said rod.

12. The instrument of claim 10 wherein said means to stabilize further include means for attachment of said support rod to an immobile surface of a medical device employed to locate an implantation needle accurately.

13. The instrument of claim 8 wherein said seed cartridge comprise two coupled couplable portions, one of which is the seed carrying portion, and the other of which contains a quick coupling means for attachment of a hollow implantation needle thereto.

14. A medical instrument comprising an elongated support rod having a proximal end and a distal end and an elongated stylet rod maintained in a spaced parallel relationship to each other by means of a stop block and a slide block longitudinally spaced apart from each other, said slide block being slidably mounted on each of said rods, said stop block being located at a predetermined position between said proximal and distal ends of said support rod and being affixed thereto, said stylet rod being slidably mounted to said stop block, said slide block having a first means to clamp said slide block to said support rod at any longitudinal position along said support rod between said stop block and said proximal end, and said slide block having a second means to clamp said slide block to said stylet rod at any longitudinal position along said stylet rod.

15. The instrument of claim 14 which additionally includes a shoe perpendicular to and connected .to said distal end of said support rod and having a flat support surface adapted to contact another object and stabilize said support rod against lateral movement.

16. The instrument of claim 14 which additionally includes a support member and means at said distal end of said support rod to rigidly attach said support rod to said support member to stabilize said support rod against lateral movement.

17. The instrument of claim 14 which additionally includes a support member having at least one passageway therethrough, and means at said distal end of said support rod including a reduced projection to fit within said passageway of said support member.

18. A radio-active seed implantation instrument comprising an elongated support rod having a distal end, a proximal end, and a longitudinal axis, a thin elongated stylet rod spaced apart from and parallel to said support rod and having a distal end, a proximal end, and a longitudinal axis, a stop block attached to said support rod and said stylet rod, a slide block slidable longitudinally along said support rod and said stylet rod, a clamping means to clamp in position said slide block to said support rod at any longitudinal position along said support rod between said stop block and said proximal end of said support rod, and another clamping means to clamp in position said slide block to said stylet rod at any longitudinal position along said stylet rod, a plug containing a plurality of spaced radio-active seeds, a seed cartridge having a central bore receiving and storing said plug, an implantation needle having a hollow extending from a sharpened distal end to a proximal end thereof, and means adjacent said proximal end for removably attaching said proximal end of said implantation needle to said seed cartridge, said stylet rod being slidable through said hollow and said central bore to move said plug from said cartridge to said distal end of said needle.

19. The instrument of claim 18 wherein said seed cartridge has a proximal portion containing said plug and a distal portion, said distal portion being removably attached by said means adjacent said proximal end of said implantation needle, and means for releasably securing said proximal and distal end portions of said seed cartridge to inhibit said seeds from inadvertent removal from said seed cartridge.

20. The instrument of claim 18 wherein said seed cartridge includes a pair of spaced lateral bores respectively above and below said plug to receive a stop means for said plug during storage and sterilization of said plug which is removed prior to use of said instrument.