Automated radioisotope seed cartridge

• US 6,616,593 B1
• Filed: 06/05/2000
• Issued: 09/09/2003
• Est. Priority Date: 06/05/2000
• Status: Expired due to Fees

• Current Assignee: Theragenics Corporation (Juniper Investment Co. LLC)
• Original Assignee: Mentor Corporation (Johnson & Johnson)
• Inventors: Hoedeman, George M., Berkey, John J., Elliott, Daniel M., Elliott, Jonathan D.
• Primary Examiner(s): Gilbert, Samuel G.
• Application Number:
  US09/587,642
• Time in Patent Office: 1,191 Days
• Field of Search: 600/1-8, 250/507.1, 604/57, 604/59-64, 976/DIG.350
• 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 2005/1009 Apparatus for loading seeds into magazines or needles
• CPC Class Codes: A61N 2005/101 Magazines or cartridges for seeds
• CPC Class Codes: A61N 2005/1011 Apparatus for permanent insertion of sources
• CPC Class Codes: A61N 5/1007 Arrangements or means for the introduction of sources into the body
• CPC Class Codes: A61N 5/1027 Interstitial radiation therapy

Abstract

An automated cartridge for use in an automated system for low dose radioisotope procedures is replaceable in the automated system and has a housing that contains a selectively positionable member having a plurality of radioisotope seeds preloaded in chambers defined in the positionable member. An aperture in the housing allows an elongated member to selectively eject radioisotope seeds from chambers in the positionable member when a given chamber is aligned with the aperture. A mechanism in the cartridge automatically positions the selectively positionable member in alignment with the aperture. Preferably, a feedback mechanism generates a positional feedback signal of a position of the chambers of the positionable member relative to the aperture.

Claims

1. An automnated cartridge for use in an automated system for low dose radioisotope procedures utilizing a plurality of implant needles, the automated cartridge comprising:

a housing arrangement, the housing arrangement including structure that mates with structure of the automated system;

a single selectively positionable member within the housing arrangement containing a plurality of chambers defined in the positionable member, each chamber being adapted to receive a seed, a spacer, or any combination thereof and the plurality of chambers being sufficient to contain the seeds and the spacers needed to load the plurality of implant needles;

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the positionable member when a given chamber it aligned with the aperture; and

automated means for positioning the selectively positionable member in alignment with the aperture,

wherein the housing arrangement substantially encloses the single selectively positionable member and the automated means to define the cartridge and the cartridge is a self contained drop-in unit for use with the automated system to load the plurality of implant needles.

2. The automated cartridge of claim 1 wherein the positionable member is a rotatable drum.

3. The automated cartridge of claim 2 wherein the chambers are positioned around a periphery of the rotatable drum.

4. The automated cartridge of claim 1 wherein each radioisotope seed is located in a unique chamber defined in the positionable member.

5. The automated cartridge of claim 1 wherein the automated cartridge further comprises an alignment structure oriented toward a tip of an implant needle to position the tip of the implant needle relative to the aperture of the cartridge.

6. The automated cartridge of claim 5 wherein the tip of the needle is beveled and the alignment structure comprises a matching beveled alignment needle guide.

7. The automated cartridge of claim 1 wherein the automated cartridge further comprises a locking mechanism for locking a rear of an implant needle to position the rear of the implant needle relative to the aperture of the cartridge.

8. The automated cartridge of claim 1 wherein the positionable member is a rotatable drum and wherein the plurality of radioisotope seeds and a plurality of spacers are preloaded into chambers that are spaced around a periphery of the rotatable drum.

9. The automated cartridge of claim 1 wherein the elongated member is a push rod.

10. An automated cartridge for use in an automated system for low dose radioisotope procedures comprising:

a housing arrangement, the housing arrangement including structure that mates with structure of the automated system;

a rotatable drum within the housing arrangement containing a plurality of radioisotope seeds and a plurality of spacers preloaded into chambers that are spaced around a periphery of the rotatable drum;

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the rotatable drum when a given chamber is aligned with the aperture; and

a stepper motor to selectively drive the rotatable drum into alignment with the aperture.

11. The automated cartridge of claim 10 further comprising a second stepper motor to drive a capstan assembly that operably drives the elongated member along a line of travel through a selectively indexed one of the chambers spaced around the periphery of the rotatable drum.

12. The automated cartridge of claim 11 wherein the rotatable drum has an associated encoder and related circuitry that generates a positional feedback signal.

13. An automated cartridge for use in an automated system for low dose radioisotope procedures comprising:

a housing arrangement, the housing arrangement including structure that mates with structure of the automated system;

a selectively positionable member within the housing arrangement containing a plurality of radioisotope seeds preloaded in chambers defined in the positionable member,

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the positionable member when a given chamber is aligned with the aperture;

automated means for positioning the selectively positionable member in alignment with the aperture; and

at least one position sensor located in the line of travel of the elongated member to detect movement of the elongated member.

14. An automated cartridge for use in an automated system for low dose radioisotope procedures comprising:

a housing arrangement, the housing arrangement including structure that mates with structure of the automated system;

a selectively positionable member within the housing arrangement containing a plurality of radioisotope seeds preloaded in chambers defined in the positionable member;

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the positionable member when a given chamber is aligned with the aperture;

automated means for positioning the selectively positionable member in alignment with the aperture; and

a machine readable storage medium that stores indicia representing at least the quantity and location of the plurality of radioisotope seeds preloaded into the cartridge.

15. The automated cartridge of claim 14 wherein the machine readable storage medium comprises an electrically erasable programmable read-only memory (EEPROM) accessible via an electrical connector.

16. An automated cartridge for low dose radioisotope procedures comprising:

a housing arrangement;

a selectively positionable member within the housing arrangement containing a plurality of radioisotope seeds preloaded in chambers defined in the positionable member;

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the positionable member when a given chamber is aligned with the aperture; and

a machine readable storage medium accessible via an electrical connector that stores indicia representing at least the quantity and location of the plurality of radioisotope seeds preloaded into the cartridge.

17. The automated cartridge of claim 16 wherein the machine readable storage medium comprises an electrically erasable programmable read-only memory (EEPROM).

18. A cartridge for use in an automated system for low dose radioisotope procedures comprising:

a housing arrangement, the housing arrangement including structure that mates with structure of the automated system;

a selectively positionable member within the housing arrangement containing a plurality of radioisotope seeds wherein each radioisotope seed is located in a unique chamber defined in the positionable member;

an aperture in the housing arrangement through which an elongated member selectively ejects individual radioisotope seeds from chambers in the positionable member when a given chamber is aligned with the aperture; and

a machine readable storage medium accessible via an electrical connector that stores indicia representing what is located in each chamber in the positionable member.

19. An automated cartridge for low dose radioisotope procedures comprising:

a housing arrangement;

a selectively positionable member within the housing arrangement containing a plurality of radioisotope seeds preloaded in chambers defined in the positionable member;

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the positionable member when a given chamber is aligned with the aperture;

automated means for positioning the selectively positionable member in alignment with the aperture, and

a feedback means for generating a positional feedback signal of a position of the chambers of the positionable member relative to the aperture that is communicated to the automated means.

20. The automated cartridge of claim 19 wherein the positionable member is a rotatable drum and the feedback means is an encoder for the rotatable drum that generates a positional feedback signal of an index of the chambers of the rotatable drum.

21. An automated cartridge for use in an automated system for low dose radioisotope procedures comprising:

a housing arrangement, the housing arrangement including structure that mates with structure of the automated system;

a rotatable drum positioned within the housing arrangement and containing a plurality of radioisotope seeds and a plurality of spacers preloaded in chambers defined around a periphery of the rotatable drum;

an aperture in the housing arrangement through which an elongated member selectively ejects radioisotope seeds from chambers in the rotatable drum when a given chamber is aligned with the aperture;

a first stepper motor operably connected to drive the rotatable drum;

a second stepper motor operably connected to drive a capstan assembly that operably drives the elongated member along a line of travel through a selectively indexed one of the chambers spaced around the periphery of the rotatable drum; and

an encoder for the rotatable drum that generates a positional feedback signal of an index of the chambers of the rotatable drum relative to the line of travel.

22. The automated cartridge of claim 21 further comprising a position sensor located in the line of travel of the elongated member to detect movement of the elongated member and generate a positional feedback signal of a position of the elongated member along the line of travel.

23. The automated cartridge of claim 21 wherein the elongated member is a push rod.

24. A method of operating an automated cartridge for use in an automated system for low dose radioisotope procedures comprising:

loading a replaceable cartridge into the automated system, the replaceable cartridge having an automated positionable member containing a plurality of radioisotope seeds preloaded in chambers defined in the positionable member and an aperture through which an automated elongated member selectively ejects radioisotope seeds from chambers;

automatically positioning the positionable member and generating a positional feedback signal of a position of the chambers relative to the aperture; and

automatically ejecting radioisotope seeds from the selected chamber using the elongated member when the positional feedback signal indicates that a selected chamber is in line with the aperture.

25. The method of claim 24 wherein each radioisotope seed is located in a unique chamber in the positionable member and wherein the radioisotope seeds are automatically ejected one seed at a time.

26. A method of operating an automated cartridge for use in an automated system for low dose radioisotope procedures comprising:

loading a replaceable cartridge into the automated system, the replaceable cartridge having a positionable member containing a plurality of radioisotope seeds preloaded in chambers defined in the positionable member and an aperture through which an elongated member selectively ejects radioisotope seeds from chambers;

automatically positioning the positionable member and generating a positional feedback signal of a position of the chambers relative to the aperture;

automatically ejecting radioisotope seeds from the selected chamber using the elongated member when the positional feedback signal indicates that a selected chamber is in line with the aperture;

storing a machine-readable indicia representing what is located in each chamber in the positionable member; and

using the machine-readable indicia to control an order in which the radioisotope seeds are ejected from the chambers.