Telecentric Scale Projection System for Real-Time In-Situ Surgical Metrology

• US 20140031665A1
• Filed: 06/27/2013
• Published: 01/30/2014
• Est. Priority Date: 07/25/2012
• Status: Abandoned Application

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Pinto, Candido Dionisio, Durvasula, Ravi, Ma, Yong, Thomas, Jonathan, Power, James, Pandey, Ashwini Kumar
• Application Number:
  US13/928,667
• Publication Number:
  US 20140031665A1
• Time in Patent Office: Days
• US Class Current: 600/407
• CPC Class Codes: A61B 2090/061 for measuring dimensions, e.g. length
• CPC Class Codes: A61B 5/107 Measuring physical dimensions, e.g. size of the entire body or parts thereof
• CPC Class Codes: A61B 5/1075 for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer A61B8/0858 takes precedence
• CPC Class Codes: A61B 5/6841 by using templates
• CPC Class Codes: A61B 90/06 Measuring instruments not otherwise provided for
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G01B 11/02 for measuring length, width or thickness G01B11/08 takes precedence
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01B 11/2513 with several lines being projected in more than one direction, e.g. grids, patterns

Abstract

A system and method for determining endoscopic dimensional measurements including a projector assembly comprising a light source for projecting light through a telecentric lens and into a surgical site, and a mask coupled to the projector assembly. Light projected from the light source projects through the mask. The projected light through the mask may be a collimated pattern which does not significantly change in size as a function of the distance to a projected plane. The projected light patterns may include multiple wavelengths of light for measurements of different features of tissue and may be produced using a laser in conjunction with a light shaping optical diffuser, or using a light emitting diode in conjunction with a light shaping optical diffuser, or using a spatial filter. The projected light patterns may take the form of concentric rings with each ring representing a radius of a given dimension.

Claims

1. A metrology system for measuring a desired portion of a surgical site, comprising:

a projector assembly comprising a light source for projecting light through a telecentric lens and into the surgical site; and

a mask operably coupled to the projector assembly, wherein light projected from the light source projects through the mask.

2. The system of claim 1, wherein the projected light includes multiple wavelengths of light for measurement of different features of tissue within the surgical site.

3. The system of claim 1, wherein the mask has concentric rings and each ring represents a radius of a given dimension for projecting the concentric rings into the surgical site.

4. The system of claim 1, wherein the mask has a plurality of uniformly spaced lines for projecting the uniformly spaced lines into the surgical site.

5. The system of claim 1, wherein the mask has a single line for projecting the single line into the surgical site.

6. The system of claim 1, wherein the mask has uniformly spaces dots for projecting the uniformly spaced dots into the surgical site.

7. The system of claim 1, wherein the mask includes a scale and the scale is projected onto the desired portion of the surgical site.

8. The system of claim 1, wherein the light source includes at least one light emitter.

9. The system of claim 8, wherein the light source further includes a diffuser for diffusing the light produced by the at least one light emitter.

10. The system of claim 1, wherein the telecentric lens is formed of a flexible material.

11. The system of claim 1, wherein the mask is formed of a flexible material.

12. The system of claim 1, further including a polymetric scale configured to be positioned external to the surgical site, and to project the scale through the tissue for viewing within the surgical site.

13. The system of claim 1, further having an imaging unit configured to capture an image of the projected light in the surgical site.

14. The system of claim 13, wherein the imaging unit is a CMOS camera.

15. The system of claim 13, wherein the imaging unit is a raster scanning device.

16. The system of claim 13, further including a microprocessor operatively coupled to the imaging unit, the microprocessor configured to perform parallax corrections of the captured image.

17. The system of claim 16, further including a display operatively coupled to the microprocessor, the microprocessor configured to calculate measurement dimensions of the desired portion of the surgical site and transmit the measurement dimensions to the display.

18. The system of claim 1, further having a sensor configured to perform triangulation or distance sensing.

19. The system of claim 18, further including an interferometer operatively coupled to the sensor.

20. The system of claim 17, wherein the measurements of the desired portion are transmitted to a mesh printing device configured to create a surgical mesh according to the measurements.