Surgical imaging systems
View Patent ↗Systems, methods and devices are provided for illuminating tissue with monochromatic or broadband light and imaging light that has been reflected back from the tissue. Imaging may be white-light imaging or hyperspectral imaging. The system can be a stand-alone hyperspectral imaging system, integrated as part of an external video scope, or as an auxiliary imaging module on an external videoscope. Various elements of a video scope that is particularly suited for minimally invasive surgery is first presented and then its configurations suitable for hyperspectral imaging are explained.
1. A surgical imaging system for imaging a surgical field within an access port during a medical procedure, the system comprising:
a surgical access port comprising a port wall and an elongate body having a corridor extending therethrough and configured to couple with anatomy of a patient, the corridor having a diameter selected to accommodate at least one hand operated surgical tool, wherein a distal end of the elongate body is configured such that exposed internal tissue is directly visible through the corridor from an external location, and the port wall comprising a light-diffusing surface texture, whereby reflectance of the port wall is decreasable;
an external optical imaging device for externally imaging internal tissue through said surgical access port, said external optical imaging device comprising:
a longitudinal housing;
an optical imaging assembly provided within said longitudinal housing; and
an imaging zoom camera interfaced with said longitudinal housing for detecting images collected by said optical imaging assembly,
said external optical imaging device being movable with respect to, and spaced away from, said surgical access port by a working distance to facilitate easy access by a surgeon to a surgical space located between said surgical port and said external optical imaging device,
wherein said optical imaging assembly and said imaging zoom camera are configured such that, when said external optical imaging device is positioned external to said surgical access port, a field of view associated with images collected by said imaging zoom camera is approximately equal to the diameter of the corridor of the surgical access port,
wherein the imaging zoom camera, operable in response to a processor, is configured to multiplex acquisition of hyperspectral data, white-light images, and video images at different wavelength bands,
wherein an illumination beam and a reflected beam, of the external optical imaging device, are collinear in relation to one another, and wherein the illumination beam is steerable by a beam-steering mechanism, whereby illumination is delivered to the bottom of the surgical access port, and
wherein a lens assembly, of the external optical imaging device, comprises a length, whereby intrusion to a user's field of view is minimized and access to a surgical space is facilitated.
2. The system according to claim 1 further comprising one or more illumination assemblies supported by said longitudinal housing, wherein an illumination axis associated with each illumination assembly is offset from an imaging axis of said optical imaging assembly.
3. The system according to claim 2 wherein each illumination assembly is longitudinally recessed from a distal end of said longitudinal housing.
4. The system according to claim 2 wherein each illumination assembly is coupled to a remote light source through a light guide.
5. The system according to claim 4 wherein said light guide is a fiber optic bundle.
6. The system according to claim 4 wherein each light guide is rotatably attached to a respective illumination mounting mechanism through a rotatable connector.
7. The system according to claim 2 wherein said one or more illumination assemblies comprise two illumination assemblies supported on opposite sides of said longitudinal housing.
8. The system according to claim 7 wherein a spacing between said two illumination assemblies is between approximately 30 mm and 35 mm.
9. The system according to claim 2 wherein said one or more illumination assemblies are connected to said longitudinal housing through a rotatable mounting mechanism that permits rotation of said one or more illumination assemblies in an annular path around said longitudinal housing.
10. The system according to claim 2 further comprising an attachment mechanism for connecting said longitudinal housing to a robotic positioning arm.
11. The system according to claim 1 , wherein said working distance is greater than approximately 25 cm.
12. The system according to claim 1 wherein said imaging zoom camera, operable in response to the processor, is configured to multiplex acquisition of the hyperspectral imaging data, white-light images, and the video images at different wavelength bands.
13. The system according to claim 1 wherein the different wavelength bands comprise a plurality of distinct wavelength bands, the plurality of distinct wavelength bands comprising at least one of a plurality of non-overlapping individual wavelength bands, a plurality of overlapping individual wavelength bands, and a combination of non-overlapping individual wavelength bands and overlapping individual wavelength bands, and
wherein the different wavelength bands comprise a plurality of distinct wavelength bands, the plurality of distinct wavelength bands comprising centers of approximately 400 nm, approximately 500 nm, approximately 600 nm, and approximately 700 nm, wherein each distinct wavelength band comprises a bandwidth of approximately 10 nm.
14. A surgical imaging system for imaging a surgical field within an access port during a medical procedure, the system comprising:
a surgical access port comprising a port wall and an elongate body having a corridor extending therethrough and configured to couple with anatomy of a patient, the corridor having a diameter selected to accommodate at least one hand operated surgical tool, wherein a distal end of the elongate body is configured such that exposed internal tissue is directly visible through the corridor from an external location, and the port wall comprising a light-diffusing surface texture, whereby reflectance of the port wall is decreasable;
an external optical imaging device for externally imaging internal tissue through said surgical access port, said external optical imaging device comprising:
a longitudinal housing,
an optical imaging assembly provided within said longitudinal housing, and
an imaging zoom camera interfaced with said longitudinal housing for detecting images collected by said optical imaging assembly,
said external optical imaging device being movable with respect to, and spaced away from, said surgical port by a working distance to facilitate easy access by a surgeon to a surgical space located between said surgical access port and said external optical imaging device,
wherein said optical imaging assembly and said imaging zoom camera are configured such that, when said external optical imaging device is positioned external to said surgical access port, a field of view associated with images collected by said imaging zoom camera is approximately equal to the diameter of the corridor of the surgical access port,
wherein the imaging zoom camera, operable in response to a processor, is configured to multiplex acquisition of hyperspectral imaging data, white-light images, and video images at different wavelength bands,
wherein the different wavelength bands comprise a plurality of distinct wavelength bands, the plurality of distinct wavelength bands comprising at least one of a plurality of non-overlapping individual wavelength bands, a plurality of overlapping individual wavelength bands, and a combination of non-overlapping individual wavelength bands and overlapping individual wavelength bands,
wherein the different wavelength bands comprise a plurality of distinct wavelength bands, the plurality of distinct wavelength bands comprising centers of approximately 400 nm, approximately 500 nm, approximately 600 nm, and approximately 700 nm, wherein each distinct wavelength band comprises a bandwidth of approximately 10 nm,
wherein an illumination beam and a reflected beam, of the external optical imaging device, are collinear in relation to one another, and wherein the illumination beam is steerable by a beam-steering mechanism, whereby illumination is delivered to the bottom of the surgical access port, and
wherein a lens assembly, of the external optical imaging device, comprises a length, whereby intrusion to a user's field of view is minimized and access to a surgical space is facilitated.
15. The system according to claim 14 , wherein said working distance is greater than approximately 25 cm.