Light box

• US 5,309,330 A
• Filed: 01/11/1993
• Issued: 05/03/1994
• Est. Priority Date: 01/11/1993
• Status: Expired due to Fees

• Current Assignee: Citation Medical Corporation (Medtronic Plc)
• Original Assignee: Citation Medical Corporation (Medtronic Plc)
• Inventors: Bornhop, Darryl J., Pillers, Russell B., Clayton, John B., Middle, George H.
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): HEYMAN, LEONARD
• Application Number:
  US08/002,924
• Time in Patent Office: 477 Days
• Field of Search: 362/32, 385/53, 385/92, 385/93, 385/54, 385/88, 385/147, 385/43, 385/64, 385/66, 385/901
• US Class Current: 362/574
• CPC Class Codes: A61B 1/00126 optical, e.g. for light supply cables
• CPC Class Codes: A61B 1/00128 mechanical, e.g. for tubes or pipes
• CPC Class Codes: A61B 1/0669 at proximal end of an endoscope
• CPC Class Codes: A61B 1/07 using light-conductive means, e.g. optical fibres
• CPC Class Codes: G02B 6/0006 Coupling light into the fibre in general G02B6/4298
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

The present invention provides a light box for fiber optic illumination cables. The light box includes a light bulb mounted in a disposable bulb holder. The light from the bulb enters a light preparation train including an aperture to produce an initial light beam, a hot mirror to reflect infrared and ultraviolet light, and an optical taper to narrow the light beam to the input diameter of the fiber optic illumination cable. The resulting light beam is passed to the illumination cable via a connector which selectively retains the fiber optic cable. The connector allows the cable to rotate while retained in the connector and includes a receiving tube surrounded by a sliding tube. A void between the tubes contains a plurality of ball retainers which can selectively extend through the wall of the receiving tube to retain the fiber optic cable. Because the connector is spring loaded, the cable is securely retained unless the sliding tube is manually moved into the releasing position by the operator. The light box further includes an electrical connector providing a safety circuit interrupting the power line to the light box when the drawer is removed, as well as a single use hour meter resetting circuit.

Claims

1. A device for providing high intensity light to a fiber optic illumination cable having an outside diameter and a optical fiber portion having an input diameter, said device comprising;

a housing;

a light bulb for providing high intensity light, said bulb being mounted in a disposable bulb holder and said bulb holder being slidably mounted in said housing;

a light preparation train for producing a final light beam from said high intensity light, said final light beam having a final light beam diameter slightly larger than said input diameter of said optical fiber portion of said fiber optic illumination cable, said light preparation train including an aperture, a hot mirror and an optical taper through which said high intensity light passes, said light preparation train being mounted in said housing and defining a light path axis; and

means mounted in said housing along said light path axis for holding and aligning said optical fiber portion of said fiber optic illumination cable in optical communication with said light preparation train.

2. The device as recited in claim 1 wherein said aperture is sized to prevent a portion of said light from impinging said fiber optic illumination cable.

3. The device as recited in claim 2 wherein said hot mirror reflects infrared and ultraviolet light while allowing visible light to pass therethrough.

4. The device as recited in claim 3 wherein a portion of said light passes through said aperture and comprises an initial light beam having an initial light beam diameter, said optical taper converting said light beam having said initial light beam diameter to said light beam having said final light beam diameter.

5. The device as recited in claim 4 further comprising a heat sink attached to said optical taper to remove energy from said optical taper during operation of said device.

6. The device as recited in claim 5 wherein said hot mirror is intermediate said light bulb and said aperture.

7. The device as recited in claim 5 wherein said aperture is intermediate said light bulb and said hot mirror.

8. The device as recited in claim 1 wherein said disposable bulb holder further comprises;

a drawer member having two edges slidingly engaging a drawer receiving means attached to said housing;

a means attached to said drawer member for automatically resetting an hour meter attached to said housing when said bulb is installed in said device; and

a means attached to said drawer member for disconnecting said device from a power supply when said disposable bulb member is removed from or incorrectly installed in said device.

9. The device as recited in claim 8 wherein said resetting means can reset said hour meter only once.

10. The device as recited in claim 9 wherein said hour meter includes a reset pin and said hour meter is reset when an alternating current is applied to said reset pin.

11. The device as recited in claim 10 where said resetting means is a power line including a fuse, said fuse being sized to allow said current to pass to said reset pin for less than 1 second before interrupting said power line, said power line being connected to said power supply only when said drawer is correctly installed in said device.

12. The device as recited in claim 11 wherein said means for disconnecting comprises a safety circuit installed in a power line for said device, said circuit being connected to an electrical connector between said drawer member and said housing, said electrical connector opening said safety circuit when said drawer member is removed from said housing.

13. The device as recited in claim 1 wherein said holding and aligning means comprises;

a generally cylindrical receiving tube connected to said housing, said receiving tube defining a longitudinal axis coaxial with said light path axis, said receiving tube having two ends, a body portion, and an inside diameter slightly larger than said outside diameter of said fiber optic illumination cable; and

a means mounted on said receiving tube for selectively retaining said fiber optic illumination cable in said receiving tube, said retaining means allowing rotation of said fiber optic illumination cable about said longitudinal axis while retaining said fiber optic illumination cable in said receiving tube.

14. The device as recited in claim 13 wherein said body portion of said receiving tube is formed to include a plurality of openings, said fiber optic illumination cable has a proximal end forming a circumferential groove thereon, and said retaining means comprises;

a generally cylindrical sliding tube coaxial with and surrounding said receiving tube, said sliding tube having a retaining position and a releasing position, said receiving tube and said sliding tube being shaped to leave an annular void therebetween;

a plurality of substantially spherical balls located in said annular void, said balls being forced by said sliding tube to partially extend through said openings to engage said groove when said sliding tube is in said retaining position; and

a helical spring positioned in said annular void, said spring being compressed by an inwardly extending ridge formed by said sliding tube and an outwardly extending shoulder formed by said receiving tube, said spring urging said sliding tube toward said retaining position.

15. The device as recited in claim 14 wherein said sliding tube is formed to allow said balls to move outward to release said fiber optic illumination cable when said sliding tube is in said releasing position.

16. The device as recited in claim 14 wherein said receiving tube forms at least three openings and said retaining means comprises at least three spherical balls.

17. A device for providing high intensity light to a fiber optic illumination cable, said cable having an outside diameter, an input diameter defined within said outside diameter, and a proximal end formed to include a circumferential groove, said device comprising;

a light bulb providing high intensity light mounted in a bulb holder;

a light preparation train connected to said bulb holder to allow light produced by said light bulb to enter said light preparation train, said light preparation train producing final light beam from said high intensity light, said final light beam having a final light beam diameter slightly larger than said input diameter of said fiber optic illumination cable, said light preparation train defining a light path axis; and

a fiber optic cable connector attached to said light preparation train to selectively connect said fiber optic illumination cable to said light preparation train, said connector comprising;

a generally cylindrical receiving tube connected to said light preparation train, said receiving tube defining a longitudinal axis coaxial with said light path axis, said receiving tube being formed with a plurality of openings and having two ends, a body portion, and an inside diameter slightly larger than said outside diameter of said fiber optic illumination cable;

a generally cylindrical sliding tube coaxially surrounding said receiving tube, said sliding tube having a retaining position and a releasing position, said receiving tube and said sliding tube being shaped to leave an annular void therebetween;

a plurality of substantially spherical balls located in said annular void, said balls being forced by said sliding tube to partially extend through said openings to engage said groove when said sliding tube is in said retaining position; and

a helical spring positioned in said annular void, said spring being compressed between an inwardly extending ridge formed by said sliding tube and an outwardly extending shoulder formed by said receiving tube, said spring urging said sliding tube toward said retaining position.

18. The device as recited in claim 17 wherein said sliding tube is formed to allow said balls to move outward to release said fiber optic illumination cable when said sliding tube is in said releasing position.

19. The device as recited in claim 18 wherein said receiving tube forms at least three openings and said retaining means comprises at least three spherical balls.

20. The device as recited in claim 19 said light preparation train comprising an aperture, a hot mirror and an optical taper through which said light passes.

21. The device as recited in claim 20 wherein said aperture is sized to prevent a portion of said light from impinging said fiber optic illumination cable.

22. The device as recited in claim 21 wherein said hot mirror reflects infrared and ultraviolet light while allowing visible light to pass therethrough.

23. The device as recited in claim 22 wherein a portion of said light passes through said aperture and comprises an initial light beam having an initial light beam diameter, said optical taper converting said light beam having said initial light beam diameter to said light beam having said final light beam diameter.