Guide apparatus for tangential entry into suprachoroidal space
An apparatus includes a body and a pair of rigid legs extending from the body. The body includes an engagement feature configured to engage a deployment instrument. The legs are parallel with each other. Each leg has a sharp tip. The legs both extend along a plane. The body defines a guide opening. The guide opening is oriented transversely relative to the plane associated with the legs. The guide opening is sized to receive a cannula having a generally flat profile. The guide opening is configured to guide the cannula through a sclerotomy at a substantially tangential orientation.
1. An apparatus for guiding a cannula through an incision in an eye, wherein the cannula has a generally rectangular or elliptical cross-section, comprising:
(a) a body, wherein the body includes an engagement feature configured to engage a deployment instrument; and
(b) a pair of rigid legs extending from the body, wherein the rigid legs are parallel with each other, wherein each rigid leg has a sharp tip dimensioned for insertion through a surface of the eye, wherein the rigid legs both extend along a plane;
wherein the body has inner walls defining a guide opening, wherein the guide opening is oriented transversely relative to the plane associated with the pair of rigid legs, wherein the guide opening is sized to receive the cannula having the generally rectangular or elliptical cross-section such that the guide opening is configured to maintain the cannula in a substantially tangential orientation relative to the incision when the pair of rigid legs are inserted through the surface of the eye, wherein the guide opening is tapered such that a cannula entry region of the guide opening is wider than a cannula exit region of the guide opening.
2. The apparatus of claim 1 , wherein the engagement feature comprises a first retaining pin opening, wherein the first retaining pin opening is configured to receive a retaining pin of the deployment instrument.
3. The apparatus of claim 2 , wherein the engagement feature further comprises a second retaining pin opening, wherein the second retaining pin opening is further configured to receive the retaining pin of the deployment instrument.
4. The apparatus of claim 3 , wherein the first and second retaining pin openings are coaxially aligned with each other.
5. The apparatus of claim 3 , wherein the first retaining pin opening is located at an upper side of the guide opening, wherein the second retaining pin opening is located at a bottom side of the guide opening.
6. The apparatus of claim 1 , wherein the pair of rigid legs comprise a ferrous material.
7. The apparatus of claim 1 , wherein the body further includes at least one chamfer.
8. The apparatus of claim 1 , wherein the body further includes at least one rib in the guide opening, wherein the at least one rib is configured to reduce contact between the guide opening and the cannula disposed in the guide opening.
9. The apparatus of claim 8 , wherein the at least one rib is positioned on an upper side of the guide opening.
10. The apparatus of claim 8 , wherein the at least one rib comprises a pair of ribs positioned on opposite lateral sides of the guide opening.
11. The apparatus of claim 1 , wherein the body further includes at least one chamfered surface leading into the guide opening.
12. The apparatus of claim 1 , wherein the pair of rigid legs have straight lower portions and bent upper portions, wherein the straight lower portions include the sharp tips, wherein the bent upper portions are located in the body.
13. The apparatus of claim 12 , wherein the bent upper portions are bent outwardly relative to a centerline of the body.
14. The apparatus of claim 1 , further comprising the deployment instrument, wherein the deployment instrument comprises:
(i) a shaft, and
(ii) a head portion located at an end of the shaft, wherein the head portion comprises:
(A) an engagement component configured to releasably engage the engagement feature of the body, and
(B) a marking feature configured to mark a sclerotomy site on the eye.
15. The apparatus of claim 14 , wherein the engagement component of the deployment instrument comprises a retaining pin.
16. The apparatus of claim 14 , wherein the engagement component of the deployment instrument comprises one or more magnets.
17. A method of using the apparatus of claim 1 , the method comprising:
(a) inserting the rigid legs into an eye of a patient, the rigid legs being inserted adjacent to an incision formed in the eye;
(b) inserting a cannula through the body via the cannula entry region of the guide opening such that the cannula exits the body via the cannula exit region of the guide opening; and
(c) further inserting the cannula into the incision formed in the eye.
18. An apparatus, comprising:
(a) a unitary body; and
(b) a pair of rigid legs, the pair of rigid legs extend from the unitary body in parallel with each other along a plane, the pair of rigid legs proximally terminating in the unitary body and being unitarily fixed to the unitary body;
wherein the unitary body defines a guide opening such that the guide opening passes through the unitary body, wherein the guide opening is oriented transversely relative to the plane associated with the pair of rigid legs, wherein the guide opening is sized to receive a cannula having a substantially flat profile, wherein the guide opening comprises inner walls within the unitary body, wherein the inner walls are all obliquely oriented relative to the plane.
19. The apparatus of claim 18 , wherein the inner walls are oriented obliquely relative to a plane perpendicular to the plane associated with the pair of rigid legs.
20. An apparatus, comprising:
(a) a cannula having a generally rectangular or elliptical cross-section; and
(b) a cannula guide configured to guide the cannula through an incision in an eye, the cannula guide comprising:
(i) a body, wherein the body includes an engagement feature configured to engage a deployment instrument, wherein the body further includes inner walls defining a guide opening, wherein the guide opening is sized to receive the cannula having the generally rectangular or elliptical cross-section, and
(ii) a pair of rigid legs extending from the body, wherein the rigid legs are parallel with each other, wherein each rigid leg has a sharp tip dimensioned for insertion through a surface of the eye, wherein the rigid legs both extend along a plane, wherein the guide opening is oriented transversely relative to the plane associated with the pair of rigid legs,
wherein the guide opening is configured to maintain the cannula in a substantially tangential orientation relative to the incision when the pair of rigid legs are inserted through the surface of the eye.