PUROHIT NIRMALA (IN)
PUROHIT NIRMALA (IN)
| Claims 1.) This design of proposed optical tube assembly has been authenticated and optimized by simulation studies on Zemax and silico. 2.) Results of evaluation and simMati on studies have been found in accordance of targeted parameters and satisfactory. Comparative statement of parameters and specifications of conventional OTA and proposed OTA are tabulated in a separate table. 3.) We claim that the present invention is beter substitute of present generation OTAs and conventionai QTAs should be replaced by • proposed OTA s. 4.) Prototype of this novel OTA is under fabrication and clinical trialsfor their appheations . |
DETAILED DESCRIPTION OF INVENTION—
The terminology used herein is for the purpose of describing particular embodiments only. As used herein, the term "and/or” and is not intended to be limiting of invention includes any and all combinations of one and more of associated listed items. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well as singular forms, unless the context clearly indicates otherwise. It will be further understood that. the term "comprises" and /or "comprising" when used in this specification, specify the presence of stated features, steps, operations, elements and /or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components and/or groups thereof.
Unless and otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one having ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should it be interpreted as having a meaning that is consistent with their meaning in the context of relevant art and present disclosure and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In describing the invention, it will be understood that a number of techniques and steps are disclosed. Each has individual benefit, and each can also be used in conjunction with one or more, or in some cases all, of theother disclosed techniques. Accordingly for the sake of clarity, this description will refrain from repeating every possible combination of the individual steps in the unnecessary fashion. Nevertheless, the specifications and claims should be read with the understanding that such combinations are entirely within the scope of invention and claims.
New optic tube assembly devices, apparatuses, and methods for the development of endoscopes and other all similar instruments/appliances /Devices where this optical principle is applicable in any form are discussed herein. In the following description, for the purpose of explanation, numerous specific details are set so forth in order to provide a thorough understanding of the present invention. It will be evident however, to one skilled in the art that the present invention may be practiced without specific details.
The present disclosure is to be considered as an exemplification of the invention, and is not intended to limit the invention to the specific embodiments illustrated by the figures or the description below.
Present invention is related with development of optical tube assembly based on a different optical principle and configuration with changed parameters of component parts. Other components like illumination specifications, obturator, instrument channels have not been studied and hance are not mentioned.
The present invention is based upon application of the principle which states that—
"if an object is placed or focused at hvPer focal distance of a lens, depth of field with acceptable sharpness produced is maximum and this depth of field extends from half of hyPerfocal distance of this lens UP to infinity". HvPerfoca/ distance also has a property of consecutive depths of field which means that if distance of object focus is reduced to half of hyPerfocal distance, depth of field is reduced from one third of.hveerfocal distance to hyperfocal distance and so on.
In present invention, this optical principle is followed and optical
Implications of this principle on various performance parameters namely FOV, DOF, WO, EXPP, resolution and other relevant factors have been studied and have been found in accordance of desired resultant parameters.
Based on this optical principle a representative sample prototype has been conceptualized and optimized on zemax and is now in the stage of fabrication. This sample prototype is of hysteroscope, used for examination of uterine cavity.
Parameters of components selected for this prototype are as under¬
Parameters of objective lens assembly-
Type- positive, aspherical, achromat doublet
Material- Poly carbonate (any suitable material could be used )
Effective Focal length-0.5 mm
Back Focal Length .0.77 mm
F#. no.- . 3.6
Maximum image circle— 1.18 mm
Chief Ray Angle— . 14.5*
Field stop Location-Back focal plane
PMMA image fiber optic bundle- central core 1 .5mm
FST dia- - - suitable for 100*FOV
Ocular
Type . positive, achromatic, doublet
Material — crown + Flint glass,
Effective Focal Length— 9.0 mm,
Back focal Length .5.0 mm
Clear aperture - 5.3 mm All these components are arranged in proper order as per configuration and glued with UV LOCA.
While preferred material for elements have been described, the device is not limited by these materials Any ether suitable material may comprise some or all of the elements of optic tube assembly.
Although the present invention has been illustrated and; described herein, with reference to preferred embodiments and specific examples thereof, it will be readily apparent to those of ordinary skill in the art that other embodiments and examples may perform similar functions and/ or achieve like results. All such equivalent embodiments and examples are within the spirit and scope of present invention, are contemplated thereby, and are intended to be: covered by following claims.
COMPARISON OF EDMUND OCULAR WITH CUSTOM
OCULAR
Table-
Comparison of optical parameters between conventional and proposed endoscope —
S.No. Parameter conventional proposed endoscope endoscope
Object At nominal distance At hyperfocal length distance from from first focal plane or consecutive length the first focal of objective lens of of hyperfocal length of
1 plane of endoscope objective lens of objective lens endoscope of endoscope
Requirement field lenses required to Field lenses not of field lenses transmit rays to relay needed 2 lenses in rigid endoscopes.
Requirement of
Required to increase Not required
3 planoconcave field of view lens
Effective focal Comparatively larger Much smaller focal length of focal length because length due to smaller objective lens calculated as per hyper focal length assembly depth of field requirement requirement
5 Total tube Larger total tube Smaller total tube length length length F.O.V.at short smaller at short Large F.O.V. at short distance distance from distance objective lens sliced depth of field at single point of focus. Depth of field Extensive depth of Needs frequent shift field produced of focus
Working space
Limited Adeq uate
Zooming of Magnifier can be Magnifier can be image attached attached
Tissue invasion/dam
Moderate Minimal age
Applicability Specific and limited Extended applicability image quality for reliability
Normal Better of diagnosis
Expensive Economical
Next Patent: AUTONOMOUS ONSITE HYDROGEN GENERATION SYSTEMS