Cutting guide for spinal osteotomy
Inventors
Siccardi, Francesco • Fiechter, Meinrad • INSINNA, Yuri
Assignees
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Publication Number
US-12343023-B2
Publication Date
2025-07-01
Expiration Date
Abstract
A cutting guide for spinal osteotomy comprises two polyhedral blocks, each polyhedral block comprising a respective tubular guide member, each tubular guide member extends from a proximal opening to a distal opening and has an axial cavity extending along a longitudinal axis; a connecting bridge which connects the two polyhedral blocks to each other and is adapted to surmount a spinous process of said vertebra; and contact members designed to match a corresponding plurality of points of contact on the patient's vertebra to define a unique coupling configuration of the cutting guide on the patient's vertebra. The two polyhedral blocks each comprise at least a first and a second slotted body, associated in pairs with a respective tubular guide member, arranged one opposite the other with respect to the corresponding tubular guide member associated therewith.
Core Innovation
The document describes a cutting guide for spinal osteotomy comprising two polyhedral blocks, each having a tubular guide member with a proximal opening, a distal opening, and an axial cavity. Each tubular guide member extends along a longitudinal axis to guide insertion of a surgical instrument on a patient's vertebra, and a connecting bridge connects the two polyhedral blocks to each other and is adapted to surmount a spinous process of the vertebra.
Contact members are designed to match a corresponding plurality of surfaces or points of contact on the patient's vertebra so as to define a unique coupling configuration of the cutting guide on the patient's vertebra. Each polyhedral block comprises at least a first and a second slotted body associated in pairs with the respective tubular guide member, and the first and second slotted bodies have respective extension surfaces that define cutting planes converging below the proximal opening of the respective tubular guide member.
Additional slotted bodies are described, including third and fourth slotted bodies, with extension surfaces that define cutting planes transverse to the cutting planes of the first and second slotted bodies. In some configurations, third and/or fourth slotted bodies communicate with the first or second slotted body to form a continuous U-shaped slot.
Claims Coverage
The document includes one independent claim. Its inventive structure comprises a patient-specific spinal osteotomy cutting guide with two polyhedral blocks, tubular guide members, a bridge surmounting the spinous process, and contact members that define a unique coupling configuration, together with slotted bodies whose extension surfaces define converging cutting planes and, in refinements, transverse cutting planes.
Two polyhedral blocks with tubular guide members
A cutting guide for spinal osteotomy comprising two polyhedral blocks, each comprising a respective tubular guide member extending from a proximal opening to a distal opening and having an axial cavity to guide insertion of a surgical instrument on a patient's vertebra, extending along a longitudinal axis.
Connecting bridge surmounting a spinous process
A connecting bridge connecting said two polyhedral blocks to each other and adapted to surmount a spinous process of said vertebra.
Contact members defining a unique coupling configuration
Contact members designed to match a corresponding plurality of surfaces or points of contact on the patient's vertebra to define a unique coupling configuration of the cutting guide on the patient's vertebra.
Paired first and second slotted bodies with converging cutting planes
Each polyhedral block comprise at least a first and a second slotted body associated in pairs with a respective tubular guide member and arranged one opposite the other with respect to the corresponding tubular guide member; said first and second slotted bodies having respective extension surfaces which define cutting planes converging below the proximal opening of the respective tubular guide member.
Third and fourth slotted bodies defining transverse cutting planes
The cutting guide comprises third and fourth slotted bodies associated with respective tubular guide members, where extension surfaces define cutting planes transverse to the extension surfaces of the first and second slotted bodies.
Continuous U-shaped slot formed by communicating slotted bodies
Third and/or fourth slotted bodies communicate with the first or second slotted body to form a continuous U-shaped slot.
Breakable connecting bridge with pre-weakening lines
A connecting bridge with pre-weakening lines and a breaking tool that breaks and removes the bridge itself.
Overall, the claim coverage centers on a spinal osteotomy cutting guide constructed from two polyhedral blocks with tubular guide members, linked by a bridge over the spinous process and coupled via contact members to define a unique coupling configuration. Slotted bodies associated with the tubular guide members provide extension surfaces that define cutting planes converging below a proximal opening, with optional transverse cutting planes from additional slotted bodies and optional formation of a continuous U-shaped slot. The connecting bridge is further refined as breakable using pre-weakening lines and a breaking tool.
Stated Advantages
Improved visibility of the operative area after breaking and removal of the bridge itself.
Documented Applications
Use as a patient-specific spinal osteotomy cutting/navigation guide for defining cutting planes for wedge-like resections in connection with vertebrae (including structures such as transverse process, lamina, and vertebral body) and for instrument guidance on a patient's vertebra.
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