Systems and methods for image magnification using relative movement between an image sensor and a lens assembly

• US 10,078,207 B2
• Filed: 03/18/2016
• Issued: 09/18/2018
• Est. Priority Date: 03/18/2015
• Status: Expired due to Fees

• Current Assignee: EndoChoice Incorporated (Boston Scientific Corporation)
• Original Assignee: EndoChoice Incorporated (Boston Scientific Corporation)
• Inventors: Aizenfeld, Amram, Krivopisk, Leonid
• Primary Examiner(s): Luo, Kate H
• Application Number:
  US15/074,807
• Publication Number:
  US 20160274350A1
• Time in Patent Office: 914 Days
• Field of Search: None
• CPC Class Codes: A61B 1/00096 Optical elements
• CPC Class Codes: A61B 1/00188 with focusing or zooming features
• CPC Class Codes: A61B 1/051 Details of CCD assembly
• CPC Class Codes: G02B 23/2438 Zoom objectives
• CPC Class Codes: G02B 23/2484 Arrangements in relation to a camera or imaging device processing or control of video signals generated by an endoscope H04N23/60, H04N23/70
• CPC Class Codes: H04N 23/51 Housings
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/555 for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
• CPC Class Codes: H04N 23/69 Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming

Abstract

The present specification describes a novel system for dynamically modifying the magnification power of optical devices used in high performance and critical applications such as medical procedures. The present specification describes an optical imaging system having a magnification control system connected to a sensor device for enabling movement of sensor device with respect to a lens assembly of the imaging system, wherein distance between the sensor device and the lens assembly is altered to enable different levels of magnification capability.

Claims

1. An endoscope comprising:

a proximal end comprising a control portion;

a distal end comprising a distal tip, wherein said distal tip comprises at least one objective lens assembly and at least one sensor configured to receive images captured by said objective lens assembly;

an insertion tube extending between the proximal end and distal end; and

a magnification control system comprising a first end positioned at the proximal end, a second end positioned at the distal end and a channel extending between the first end and second end, wherein said first end comprises a first member positioned within the channel, wherein said second end comprises a second member positioned within the channel and physically coupled to the sensor, and wherein the magnification control system is configured such that movement of the first member causes a corresponding movement of the second member and sensor;

wherein the channel is a first cylindrical unit, wherein the first member is a first hub, wherein the second member is a second hub, and wherein the second hub is coupled to the sensor and the first hub is coupled to a user control unit; and

wherein the user control unit is adapted to generate a signal that causes an actuator to move the first hub in a proximal or distal direction and thereby communicate a pressure change to the second member, causing a movement of the second hub which translates into a corresponding movement of the sensor coupled to the second hub.

2. The endoscope of claim 1 wherein the channel is air tight closed system.

3. The endoscope of claim 1 wherein the second hub is coupled to the sensor through a printed circuit board which is located on a horizontal portion of the sensor.

4. The endoscope of claim 1 wherein the channel is filled with a fluid and configured to be a fluid closed system such that no fluid is permitted to pass outside the channel and beyond the first hub or second hub.

5. The endoscope of claim 1 wherein said magnification control system has a first level of magnification capability and a second level of magnification capability, wherein the first level of magnification capability is defined by the sensor being located in a first position and the second level of magnification capability is defined by the sensor being in a second position such that the second position is further from the objective lens assembly than the first position.

6. The endoscope of claim 5 wherein, at the first position, a distance of the sensor from the objective lens ranges from 0.7 mm to 1.7 mm and, at the second position, a distance of the sensor from the objective lens ranges from 1.8 mm to 2.7 mm.

7. The endoscope of claim 5 wherein, at the first position, the sensor is at a distance ranging from 1 mm to 1.2 mm from the objective lens assembly and at the second position the sensor device is at a distance of 1.3 mm from the objective lens assembly.

8. The endoscope of claim 5 wherein the magnification control system is adapted to move the sensor from the first position to the second position in incremental steps of 0.01 mm.

9. The endoscope of claim 1 wherein the channel comprises a first cylindrical unit coupled to a piston based controller on a proximal end and a second hub on a distal end.

10. The endoscope of claim 9 wherein said piston based controller comprises a piston coupled to a control switch through a connecting rod and a spring.

11. The endoscope of claim 1 wherein said control portion, first end and first member are located in a handle portion of the endoscope and said second end and second member are located in said distal tip.

12. An endoscope comprising:

a lens assembly, wherein said lens assembly comprises a plurality of lenses;

a sensor configured to receive images captured by said lens assembly; and

,

a magnification control system coupled to said sensor comprising a first cylindrical unit coupled to a first hub and a second cylindrical unit coupled to a second hub, wherein the first cylindrical unit and second cylindrical unit are connected through an air-tight tube, wherein the first hub is coupled to a user control unit and the second hub is coupled to the sensor, and wherein the magnification control system is configured such that movement of the first hub translates into movement of the second hub and sensor device through a change in air pressure in the air-tight tube.

13. The endoscope of claim 12 wherein the first cylindrical unit and second cylindrical unit in combination with the tube comprise a fluid tight closed system.

14. The endoscope of claim 12 wherein the second hub is coupled to the sensor device through a printed circuit board which is located on a horizontal portion of the sensor.

15. The endoscope of claim 12 wherein said magnification control system has a first level of magnification capability and a second level of magnification capability, wherein the first level of magnification capability is defined by the sensor being located in a first position and the second level of magnification capability is defined by the sensor being in a second position such that the second position is further from the lens assembly than the first position.

16. An endoscope with an image magnification capability comprising:

a distal tip section comprising a plurality of objective lenses, a sensor configured to receive images captured by said plurality of objective lenses, and at least one expandable and retractable connector coupling the sensor to a lens holder and facilitating a movement of the sensor across a plurality of predefined positions; and

a magnification control system coupled to said sensor enabling said movement of the sensor relative to a position of said plurality of objective lenses to provide varying levels of magnification capability, wherein said magnification control system comprises a first unit coupled to a first hub located in a control handle portion of the endoscope and a second unit coupled to a second hub located in the distal tip section of the endoscope, wherein the first unit and second unit are connected through an air-tight tube, having a first level of air pressure, extending from said control handle portion to said distal tip section, and wherein said second hub is coupled to the sensor and the first hub is coupled to a user control system.

17. The endoscope in accordance with claim 16, wherein said expandable and retractable connector comprises a curved bended structure.

18. The endoscope in accordance with claim 16, wherein said sensor comprises a vertical portion, a first horizontal portion and a second horizontal portion.

19. The endoscope in accordance with claim 18, further comprising a second expandable and retractable connector, wherein said first horizontal portion comprises a first housing to accommodate a movement of the at least one expandable and retractable connector and said second horizontal portion comprises a second housing to accommodate a movement of the second expandable and retractable connector.

20. A method of operating an endoscope comprising a distal tip with an objective lens assembly and a sensor configured to receive images captured by said objective lens assembly, a control handle, an insertion tube extending between the distal tip and control handle, and a magnification control system comprising a first end in the control handle, a second end in the distal tip and coupled to the sensor, and a fluid-tight channel extending through the insertion tube and between the first end and second, the method comprising:

at the control handle, receiving an input to change a magnification level;

in response to said input, causing a pressure level at the first end to change; and

as a result of the pressure level change, communicating said pressure level change through the fluid-tight channel to the second end, wherein said pressure level change causes the second end to move and, correspondingly, the sensor to move, thereby altering a distance between the sensor and the objective lens assembly by an amount determined by said input.

21. The method of claim 20 wherein increasing the distance between the sensor and the objective lens assembly by a predetermined unit in response to the input increases a magnification of the endoscope.

22. The method of claim 20 wherein decreasing the distance between the sensor and the objective lens assembly by a predetermined unit in response to the input decreases a magnification of the endoscope.