Light guide or image guide components for disposable endoscopes

Patent metadata

Field	Value
Publication number	US-11510553-B2
Application number	US-202017037402-A
Country	US
Kind code	B2
Filing date	Sep 29, 2020
Priority date	Mar 29, 2018
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

The disclosure relates to diagnostic, surgical, and/or therapeutic devices for being introduced into the human or animal body or for in vitro examination of human or animal blood samples or other body cells, in particular to an endoscope or a disposable endoscope that includes at least one illumination light guide and/or image guide for transmitting electromagnetic radiation, the illumination light guide or image guide having a proximal end face for incoupling or outcoupling of electromagnetic radiation and a distal end face for incoupling or outcoupling of electromagnetic radiation. The proximal and/or distal end faces consist of plastic elements that are transparent at least partially or in sections thereof, the transparent plastic being biocompatible and/or having non-toxic properties to human or animal cell cultures for exposure durations of less than one day. This allows for the production of assemblies for disposable endoscopes, inter alia.

First claim

The invention claimed is:

1. A device for being introduced into the human or animal body or for in-vitro examination of human or animal blood samples or other body cells, comprising:
a guide for transmitting electromagnetic radiation, wherein the guide has a proximal end face for incoupling or outcoupling of electromagnetic radiation and has a distal end face for incoupling or outcoupling of electromagnetic radiation,
wherein at least one of the proximal end face and the distal end face are elements that are made of a plastic that is at least partially a transparent plastic or are overmolded with a transparent plastic,
wherein the transparent plastic is biocompatible and/or non-cytotoxic to human or animal cell cultures over exposure durations of less than one day and is selected from the group consisting of cyclo-olefin copolymers, polycarbonates, polyethylene terephthalates, perfluoroalkoxy polymers, polyvinylidene fluorides, polymethyl methacrylates, polymethyl methacrylimides, acrylic-styrene-acrylonitrile copolymers, or room temperature crosslinking silicone, hot crosslinking liquid silicones, epoxy casting resins or adhesives, thermally or UV crosslinking acrylate casting resins, polyurethane casting resins, polyester casting resins, and combinations thereof.

2. The device of claim 1 , wherein at least one of the proximal end face and the distal end face of the guide further comprises a mechanical interface, wherein the mechanical interface is a ferrule contour made of a ferrule plastic, and
wherein the ferrule plastic differs from the transparent plastic at least partially with respect to its material, transparency, and/or color.

3. The device of claim 1 , wherein the transparent plastic has a surface roughness R a of ≤1.0 μm.

4. The device of claim 1 , wherein the transparent plastic has a refractive index which substantially matches that of a core material of fibers or fiber components used in the guide, with a deviation thereto of not more than ±0.1.

5. The device of claim 1 , wherein the guide comprises at least one of:
a fiber bundle consisting of glass optical fibers, quartz optical fibers, or plastic optical fibers; and
individual fibers made of glass, quartz, or plastic, wherein the individual fibers are enclosed at least partially or in sections thereof by any of a jacket, tube, shrink tube, or netting tube, or are protected by a shaft of the endoscope.

6. The device of claim 5 , wherein the jacket is made of a jacket plastic and is an extruded cable.

7. The device of claim 6 , wherein the jacket plastic is a plastic that is translucent, opaque, or colored at least partially.

8. The device of claim 5 , wherein the guide consists of the fiber bundle, and the fiber bundle is flexible or semi-flexible.

9. The device of claim 1 , wherein the guide consists of drawn fiber rods or pressed fiber rods and is a rigid guide.

10. The device of claim 5 , wherein the fibers of the fiber bundle and/or the individual fibers are made of a Pb-free or heavy metal-free core glass and cladding glass.

11. The device of claim 5 , wherein the fibers of the fiber bundle and/or the individual fibers are made of a glass system which has an acceptance angle 2α of greater than 80° for the light to be carried.

12. The device of claim 1 , wherein the distal end face and/or the proximal end face with the mechanical interface comprise a ferrule that is formed separately and is fixed on a fiber bundle end or fiber rod end of the guide with an adhesive or casting resin,
wherein the adhesive is a thermally curing or UV light curing adhesive which has an optical refractive index substantially matching that of the core material of the fibers or fiber components used in the guide, with a deviation thereto of not more than ±0.1, and
wherein the refractive index of the ferrule is lower than that of the adhesive or casting resin.

13. The device of claim 12 , wherein the ferrule comprises receptacle areas for accommodating a fiber bundle,
wherein the receptacle areas comprise a conical portion transitioning into a portion that has substantially parallel side walls,
wherein the ferrule furthermore has seats for electronic components, and
wherein the receptacle areas at least partially surround the seats.

14. A process of making the device of claim 2 , comprising the steps of:
forming the distal and/or proximal end faces with the mechanical interface in the form of a ferrule by injection molding on cable sections previously cut to length so that the cable has a cable end;
fixing the cable end at least at two opposite points by tools adapted to the outer contour of the cable;
overmolding the cable end at least partially or in sections thereof with a first plastic;
molding a geometry of the ferrule to the cable end with a second plastic; and
optionally, molding the distal and/or proximal end faces with the transparent plastic in any one of said forming, fixing, overmolding, and molding steps.

15. The device of claim 1 , wherein the proximal end face and/or the distal end face of the guide further comprises an active electronic component that is selected from the group of an LED, a laser diode, a sensor, a camera chip, and combinations thereof, wherein the active electronic component is integrated into the overmolded ferrules or can be fitted thereto with a snap-in connection.

16. The device of claim 15 , further comprising additional glass or plastic components on the proximal end face and/or the distal end face for covering the active electronic components.

17. The device of claim 1 , wherein the proximal end face and/or the distal end face is an optical element to achieve specific beam shaping.

18. The device of claim 6 , wherein the extruded cable is a hybrid cable.

19. The device of claim 18 , wherein the hybrid cable is a multi-lumen cable that separately routes fiber bundles, individual quartz fibers, and media in the form of gases or liquids into at least one of a fluid passage and an electrical lines.

20. The device according to claim 19 , wherein the multi-lumen cable defines a flexible portion of the endoscope; or
wherein the multi-lumen cable is made of a plastic that is rigid at room temperature and defines a rigid shaft of the endoscope.

21. The device of claim 18 , wherein the hybrid cable is produced by a co-extrusion process so as to be transparent or opaque in segments thereof.

22. A process for making the device of claim 1 , comprising the steps of:
in a continuous process, overmolding a double contour ferrule on a previously extruded cable at specific intervals corresponding to a length of a mechanical interface;
severing the cable at the length of the mechanical interface to produce a cable section;
molding the proximal end face and/or the distal end face to the cable section in an injection molding process using clear transparent plastic.

23. The process of claim 22 , wherein the cable section has a fiber bundle enclosed therein, and the fiber bundle has been offset in from an edge of the cable section, the method further comprising the step of:
filling the space between the fiber bundle end and the edge of the cable section with a transparent self-leveling plastic.

24. The process of claim 23 ,
wherein the cable section has a fiber bundle enclosed therein, and the fiber bundle has been offset in from an edge of the cable section, the method further comprising the step of:
filling the space between the fiber bundle

Assignees

• Schott Ag

Inventors

• Schultheis Bernd
• Bleisinger Björn
• Dietrich Andreas
• Kappel Markus
• Russert Hubertus
• Cramer Martin
• Weingärtner Thomas

Classifications

• A61B1/00103 Primary

  designed for single use · CPC title

• G02B23/26

  using light guides {(for illumination G02B23/2469)} · CPC title

• G02B6/262

  Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements · CPC title

• G02B6/325

  comprising a transparent member, e.g. window, protective plate · CPC title

• B29D11/00663

  Production of light guides · CPC title