Medical endoscopic instrument
AssigneeRichard Wolf GmbH
InventorsBernd Claus Weber, Moritz Tewes
Life of this patent
Estimating the term…
Abstract
A medical endoscopic instrument includes a distal elongated insertion section (1) for minimally invasive insertion into a human or animal body, with at least one LED (5) arranged in a distal end section of the insertion section (1), and a lens system (19) arranged distally of the LED (5) with an optical axis (x). The lens system (19) includes a first lens (29) and a second lens (31) arranged distally of the first lens (29). The second lens (31) has a proximally extending sleeve extension (35). The sleeve extension (35) has a first reference surface for positioning the second lens (31) in relation to the insertion section (1) and a second reference surface (39) for positioning the first lens (29) in relation to the second lens (31).
Claims24
A medical endoscopic instrument comprising:
- a distal elongated insertion section configured for minimally invasive insertion into a human or animal body;
- a LED arranged in a distal end section of the insertion section;
- a lens system arranged distally of the LED, the lens system having an optical axis, wherein the lens system comprises a first lens and a second lens arranged distally of the first lens, and wherein the second lens includes a proximally extending sleeve extension and wherein the first lens includes a sleeve extension with a distal section and a proximal section, wherein the sleeve extension of the second lens includes a first reference surface for positioning the second lens in relation to the insertion section and a second reference surface for positioning the first lens in relation to the second lens, wherein the second lens is a plano-concave lens with a planar surface, the planar surface of the second lens facing in a proximal direction;
- and
- a shortpass filter being arranged at the planar surface of the second lens, wherein the sleeve extension of the second lens surrounds the shortpass filter, the first lens, the LED and the distal section of the sleeve extension of the first lens.
A method of producing a lens system, which is suitable for use in a distal end of a medical endoscopic instrument and comprises at least one lens, wherein a sleeve extension of the at least one lens is created by removing a core of a blank by means of an ablative process, the medical endoscopic instrument comprising a shortpass filter and a distal elongated insertion section, wherein the lens system further comprises another lens arranged distally of the at least one lens, the another lens including a proximally extending sleeve extension and wherein the sleeve extension of the at least one lens includes a distal section and a proximal section, wherein the proximally extending sleeve extension includes a first reference surface for positioning the another lens in relation to the insertion section and a second reference surface for positioning the at least one lens in relation to the another lens, wherein the another lens is a plano-concave lens with a planar surface, the planar surface of the another lens facing in a proximal direction, the shortpass filter being arranged at the planar surface of the another lens, wherein the sleeve extension of the another lens surrounds the shortpass filter, the at least one lens, an LED and the distal section of the sleeve extension of the at least one lens.
A method of producing a lens system, which is suitable for use in a distal end of a medical endoscopic instrument, with at least one lens and a sleeve extension, wherein in a first additive step, quartz glass particles are mixed with a certain quantity of liquid plastic and, by way of stereolithography, are hardened by means of light at desired points, and a core of a blank in a form of material that had remained liquid, is then washed out in a solvent bath in a second ablative step so only a desired, hardened structure is left as the at least one lens with the sleeve extension, the medical endoscopic instrument comprising a shortpass filter and a distal elongated insertion section, wherein the lens system further comprises another lens arranged distally of the at least one lens, the another lens including a proximally extending sleeve extension and wherein the sleeve extension of the at least one lens includes a distal section and a proximal section, wherein the proximally extending sleeve extension includes a first reference surface for positioning the another lens in relation to the insertion section and a second reference surface for positioning the at least one lens in relation to the another lens, wherein the another lens is a plano-concave lens with a planar surface, the planar surface of the another lens facing in a proximal direction, the shortpass filter being arranged at the planar surface of the another lens, wherein the sleeve extension of the another lens surrounds the shortpass filter, the at least one lens, an LED and the distal section of the sleeve extension of the at least one lens.
Dependencies are inferred from the claim text.