A delicate tissue retraction system having a hollow tubular retractor, a hollow tubular introducer that is removably installed within the retractor, and a navigation module that is removably installed within the introducer. The navigation module has a shaft with a proximal shaft end and a distal sha
A delicate tissue retraction system having a hollow tubular retractor, a hollow tubular introducer that is removably installed within the retractor, and a navigation module that is removably installed within the introducer. The navigation module has a shaft with a proximal shaft end and a distal shaft end, and a navigation unit mounted to the proximal shaft end. When assembled, the distal shaft end is contained generally within the introducer and the navigation module outside the introducer. The navigation module indicates the location of one or more points on at least one of the retractor and the introducer to a navigation system.
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1. A delicate tissue retraction system comprising: a retractor comprising a hollow tubular retractor passage extending along a longitudinal centerline from a proximal retractor end to a distal retractor end;an introducer configured to be removably installed within the retractor and comprising a prox
1. A delicate tissue retraction system comprising: a retractor comprising a hollow tubular retractor passage extending along a longitudinal centerline from a proximal retractor end to a distal retractor end;an introducer configured to be removably installed within the retractor and comprising a proximal introducer end and a distal introducer end, wherein, when the introducer is installed within the retractor, the proximal introducer end and distal introducer end are located along the longitudinal centerline with the distal introducer end extending beyond the distal retractor end; anda navigation unit mounted to at least one of the retractor and the introducer and, when the introducer is installed within the retractor, the navigation unit is: positioned at a location that is offset in a direction perpendicular to the longitudinal centerline from the hollow tubular retractor passage, andconfigured to indicate the location of the distal introducer end. 2. The delicate tissue retraction system of claim 1, wherein the introducer comprises a hollow tubular introducer passage extending from the proximal introducer end to the distal introducer end. 3. The delicate tissue retraction system of claim 2, wherein the distal introducer end comprises an open tip. 4. The delicate tissue retraction system of claim 2, wherein the area of the hollow tubular introducer passage, as measured in a plane perpendicular to the longitudinal centerline, decreases from a relatively large size at the proximal introducer end to a relatively small size at the distal introducer end. 5. The delicate tissue retraction system of claim 4, wherein the introducer is formed by a wall having a generally uniform thickness along the length of the introducer from the proximal introducer end to the distal introducer end. 6. The delicate tissue retraction system of claim 4, wherein the hollow tubular introducer passage comprises a tapered first introducer region adjacent the proximal introducer end, a straight second introducer region extending from the first introducer region, and a tapered third introducer region extending from the second introducer region to the distal introducer end. 7. The delicate tissue retraction system of claim 6, wherein the straight second introducer region extends to the distal retractor end when the introducer is installed within the retractor. 8. The delicate tissue retraction system of claim 6, wherein the hollow tubular retractor passage comprises a tapered first retractor region adjacent the proximal retractor end, and a straight second retractor region extending from the first retractor region to the distal retractor end. 9. The delicate tissue retraction system of claim 1, wherein the introducer comprises a transparent distal tip to allow visualization of underlying tissue. 10. The delicate tissue retraction system of claim 1, wherein the distal introducer end and the hollow tubular retractor passage are transparent to allow visualization of underlying tissue therethrough. 11. The delicate tissue retraction system of claim 1, wherein the hollow tubular retractor passage has an oval shape as viewed along the longitudinal centerline. 12. The delicate tissue retraction system of claim 1, wherein, when the introducer is installed within the retractor, the navigation unit does not overlap any part of the hollow tubular retractor passage as viewed along the longitudinal centerline. 13. The delicate tissue retraction system of claim 1, wherein the navigation unit is mounted at a location where it does not interfere with visualization into the introducer and retractor when the introducer is installed within the retractor. 14. The delicate tissue retraction system of claim 1, wherein the navigation unit is mounted to a handle that extends from the retractor. 15. The delicate tissue retraction system of claim 14, wherein the navigation unit is mounted to a manipulation arm that is removably connected to the handle. 16. The delicate tissue retraction system of claim 15, wherein the manipulation arm comprises a clamp configured to selectively tighten onto the handle. 17. The delicate tissue retraction system of claim 15, wherein the navigation unit is mounted to the top of the manipulation arm. 18. The delicate tissue retraction system of claim 15, wherein the navigation unit is removable from the manipulation arm. 19. The delicate tissue retraction system of claim 1, wherein the navigation unit comprises a cluster of three or more reflectors. 20. The delicate tissue retraction system of claim 1, wherein, when the introducer is installed within the retractor, the proximal introducer end is adjacent the proximal retractor end.
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