Surgical probe with increased fluid flow
View Patent ↗A surgical probe, e.g. a vitrectomy probe, and methods of making the same are disclosed. An exemplary surgical probe may include a tubular body and a cutting tool that is received within the body. The tubular body may define a cutting aperture that is adjacent a first end of the body and a fluid passage that extends through the body from the cutting aperture to a second end of the body. The cutting tool may be received within the body and disposed within the fluid passage. The cutting tool is generally configured to allow fluid flow through the cutting tool. The cutting tool may include a body portion and a blade portion that is configured to cut material entering the cutting aperture. The body portion may extend only partially about an inner circumference of the tubular body.
1. A vitrectomy probe, comprising:
a tubular body defining a cutting aperture adjacent a first end of the body and a fluid passage through the body from the cutting aperture to a second end of the body; and
a cutting tool disposed within the fluid passage, the cutting tool configured to allow fluid flow through the cutting tool and to reciprocate within the tubular body to move across the cutting aperture thereby cutting ophthalmic tissue that enters the cutting aperture, the cutting tool including:
a body portion;
a blade portion disposed at a first end of the body portion, the blade portion having a blade configured to cut material at the cutting aperture; and
a transitional portion disposed between the blade portion and the body portion, the transitional portion defining an angled surface extending between the blade and body portions, the angled surface defining an angle less than 90 degrees with a longitudinal axis of the cutting tool;
wherein the body portion extends only partially about an inner circumference of the tubular body; and
wherein the blade portion extends only partially about a cutting end of the cutting tool adjacent the cutting aperture, the cutting tool defining an opening in the cutting end, the opening positioned opposite the blade with respect to the circumference of the cutting end and defining a second angled surface, the second angled surface defining an angle less than 90 degrees with the longitudinal axis of the cutting tool.
2. The surgical probe of claim 1 , wherein the cutting tool defines a shape corresponding to an inner surface of the tubular body along the blade portion of the cutting tool.
3. The surgical probe of claim 1 , wherein the cutting tool extends about no more than one half of the inner circumference of the tubular body along the body portion of the cutting tool.
4. The surgical probe of claim 1 , wherein the body portion of the cutting tool cooperates with the tubular body to define a first cross-sectional area normal to a fluid flow through the tubular body, the first cross-sectional area being larger than a second cross-sectional area normal to the fluid flow defined by the cutting tool.
5. The surgical probe of claim 1 , wherein the body portion of the cutting tool defines a generally semi-circular shape.
6. The surgical probe of claim 1 , wherein the first end of the tubular body is configured to be inserted into a surgical incision, and the second end is configured to be secured to a surgical tool for fluid exchange therewith, the second end defining a fluid aperture in fluid communication with the cutting aperture.
7. The surgical probe of claim 1 , wherein the blade portion of the cutting tool is formed of a first material, and the body portion of the cutting tool is formed of a second material different from the first material.
8. The surgical probe of claim 1 , wherein the body portion of the length of the cutting tool is at least one half of the length.