Stent inspection system
View Patent ↗Apparatus, systems, and methods for inspecting longitudinal surfaces and sidewalls of cut tubes are disclosed. In some embodiments, the apparatus includes a line camera, the line camera being configured to capture images of longitudinal surfaces of the cut tubes, an area camera joined with the line camera, the area camera being configured to capture images of sidewalls of the cut tubes, a mandrel and drive, a multi-axis motion stage, a vertical motion stage, and a rotating motion stage. In some embodiments, the system includes a camera module, a tube positioning module, a motion control module, and an analysis module. In some embodiments, the method includes positioning a line and area cameras, moving the cut tubes, capturing images of the longitudinal surfaces and sidewalls of the cut tubes, providing comparable images of a template cut tube, and comparing the images of the cut tubes to those of the template cut tube.
1. An apparatus for capturing images of longitudinal surfaces and sidewalls of cut tubes, said apparatus comprising:
a line camera, said line camera being configured to capture images of longitudinal surfaces of the cut tubes;
a rotatable, 360 degree area camera joined with said line camera, said area camera being configured to capture images of sidewalls around 360° of the cut tubes;
a mandrel and drive adapted to hold and axially rotate the cut tubes about a Y-axis for positioning the cut tubes with respect to said line camera and said area camera;
a multi-axis motion stage for moving the mandrel, drive, and cut tubes along an X-axis and along said Y-axis for positioning the mandrel, drive, and cut tubes with respect to said line camera and said area camera;
a vertical motion stage for moving said line camera and said area camera along a Z-axis for positioning said line camera and said area camera with respect to the cut tubes; and
a rotating motion stage for rotating said line camera and said area camera substantially about an X′-axis for positioning said line camera and said area camera with respect to the cut tubes.
2. An apparatus according to claim 1 , further comprising a motion control system for controlling said multi-axis motion stage, said vertical motion stage, and said rotating motion stage.
3. An apparatus according to claim 1 , wherein said line camera is configured to capture images of the longitudinal surfaces of a stent.
4. An apparatus according to claim 1 , wherein said area camera is configured to capture images of the sidewalls surfaces of a stent.
5. An apparatus according to claim 1 , further comprising a rotating mandrel stage for rotating said mandrel, drive, and cut tubes about an X″-axis for positioning said mandrel, drive, and cut tubes with respect to said line and area cameras.
6. An apparatus according to claim 1 , further comprising a rotating mechanism for rotating said area camera.
7. A system for inspecting longitudinal surfaces and sidewalls of cut tubes, said system comprising:
a camera module including a line camera and a rotatable, 360 degree area camera, said line camera being configured to capture images of longitudinal surfaces of the cut tubes and said area camera being configured to capture images of sidewalls around 360° of the cut tubes;
a tube positioning module including a mandrel and drive adapted to hold and axially rotate the cut tubes about a first axis, a multi-axis motion stage for moving the mandrel, drive, and cut tubes, along said first axis and along a second axis, and a vertical motion stage for moving said line camera and said area camera along a Z-axis;
a motion control module for controlling said multi-axis motion stage and said vertical motion stage to position the cut tubes with respect to said line and area cameras; and
an analysis module for comparing said images of the longitudinal surfaces and sidewalls of the cut tubes to images of longitudinal surfaces and sidewalls of a template cut tube.
8. A system according to claim 7 , wherein said motion control module includes a rotating motion stage for rotating said line camera and said area camera about a second axis, wherein said second axis is adapted to be positioned substantially perpendicular to said first axis.
9. A system according to claim 7 , wherein said line camera is configured to capture images of the longitudinal surfaces of a stent.
10. A system according to claim 7 , wherein said area camera is configured to capture images of the sidewalls surfaces of a stent.
11. A system according to claim 7 , wherein said camera module includes a rotating mechanism for rotating said area camera.
12. The system of claim 7 wherein said analysis mode warps said images to match templates and then compares said warped images to template images of said longitudinal sides and sidewalls.
13. A method for inspecting longitudinal surfaces and sidewalls of cut tubes having a conical shape, said method comprising: providing a line camera to capture trapezoidal pixel images of longitudinal surfaces of said cut tube; providing an area camera to capture images of sidewalls of said tube; reconfiguring said trapezoidal images to square pixels for analysis: and subsequent to said reconfiguring step, utilizing a computer to compare said images of longitudinal surfaces and said images of sidewalls with images of longitudinal surfaces and images of sidewalls of a template cut tube, wherein a non-transitory computer readable recording medium having housed thereon has a computer program that, compares an image of said cut tube with that cut tube's CAD model and locates imperfections on longitudinal surfaces and sidewalls of the cut tube, said computer program further compensates for general and for low frequency deviations in the comparison between said cut tube and the CAD model in a section-by-section overlay and best-fit of corresponding sections of a CAD data set and an actual data set so that defects in said cut tube are indicated by deviation from a minimum amplitude or slope of said low frequency deviations.