Expandable parenchymal bolt with lever activation
First Claim
1. A bolt for insertion into an opening in a skull, the bolt comprising:
- an expandable body having an instrument lumen, the lumen having an inner diameter having a size for slidably accepting an instrument;
a cap in contact with one end of the body;
a base in contact with another end of the body; and
an expansion activating device that interconnects the cap with the base and comprises a lever, wherein the expansion activating device causes the cap and base to move closer together when the lever is moved in a predetermined direction thereby causing the expandable body to increase its outer diameter and decrease the diameter of the instrument lumen wherein an instrument received in the instrument lumen is clamped in the lumen by the expandable body, and the expansion activating device allows the cap and base to move farther apart when the lever is moved in a second predetermined direction thereby allowing the expandable body to decrease its outer diameter and increase the diameter of the instrument lumen wherein an instrument received in the instrument lumen can slide in the lumen;
whereby when the expansion activation device is engaged, the outer diameter of the body makes contact with the skull opening.
1 Assignment
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Accused Products
Abstract
A low profile parenchymal bolt having a cap, a body, and a base with two rods located through the cap that the base. Levers are located at the cap and are interconnected with the rods. Moving the levers outwardly pulls the rods and base towards the cap compressing the body and causing its outer diameter to increase into contact with an opening in the skull of a patient to form a fluid-tight seal and fixing the bolt in position. A lumen permits mounting an instrument through the bolt and when the body is compressed, the lumen reduces in size thus clamping the instrument in place in the bolt and forming a fluid-tight seal. Through use of non-ferric materials, artifacts in MRI are reduced.
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Citations
16 Claims
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1. A bolt for insertion into an opening in a skull, the bolt comprising:
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an expandable body having an instrument lumen, the lumen having an inner diameter having a size for slidably accepting an instrument; a cap in contact with one end of the body; a base in contact with another end of the body; and an expansion activating device that interconnects the cap with the base and comprises a lever, wherein the expansion activating device causes the cap and base to move closer together when the lever is moved in a predetermined direction thereby causing the expandable body to increase its outer diameter and decrease the diameter of the instrument lumen wherein an instrument received in the instrument lumen is clamped in the lumen by the expandable body, and the expansion activating device allows the cap and base to move farther apart when the lever is moved in a second predetermined direction thereby allowing the expandable body to decrease its outer diameter and increase the diameter of the instrument lumen wherein an instrument received in the instrument lumen can slide in the lumen; whereby when the expansion activation device is engaged, the outer diameter of the body makes contact with the skull opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A bolt for insertion into an opening in a skull and for receiving and clamping an instrument also intended to be inserted into the opening in the skull, the bolt comprising:
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an expandable body having an instrument lumen, the lumen having an inner diameter having a size for slidably accepting an instrument; a cap in contact with one end of the body, the cap being larger in diameter than the opening in the skull, the cap having a cap aperture aligned with the lumen of the expandable body; a strain relief located at the cap in alignment with the cap aperture such that an instrument inserted through the aperture will be engaged by the strain relief; a base in contact with another end of the body; and an expansion activating device that interconnects the cap with the base and comprises a lever, wherein the expansion activating device causes the cap and base to move closer together when the lever is moved in a predetermined direction thereby causing the expandable body to increase its outer diameter and decrease the diameter of the instrument lumen wherein an instrument received in the instrument lumen is clamped in the lumen by the expandable body, and the expansion activating device allows the cap and base to move farther apart when the lever is moved in a second predetermined direction thereby allowing the expandable body to decrease its outer diameter and increase the diameter of the instrument lumen wherein an instrument received in the instrument lumen can slide in the lumen. - View Dependent Claims (15, 16)
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Specification