US 11,684,482 B2Granted

Spondylolisthesis system and methods

AssigneeAdditive Implants, Inc.

InventorJohn R. Ehteshami

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Abstract

An intervertebral implant for spondylolisthesis correction includes a superior side with serrations angled superiorly and toward the implant insertion direction, an inferior side with serrations angled inferiorly and opposite the implant insertion direction, and an instrument connection feature. An instrument for connection to the implant includes an implant connection feature movable between unlocked and locked states, and a friction-reducing feature movable between disengaged and engaged states. The instrument has a first state, in which the implant connection feature is in the unlocked state and the friction-reducing feature is in the disengaged state; a second state, in which the implant connection feature is in the locked state and the friction-reducing feature is in the engaged state; and a third state, in which the implant connection feature is in the locked state and the friction-reducing feature is in the disengaged state. Methods of apparatus assembly and surgery are disclosed.

Claims22

Dependent claims

A system for spinal surgery in an intervertebral space between a superior vertebra and an inferior vertebra, comprising:

an implant for implantation in the intervertebral space, wherein the implant comprises a superior side for contacting the superior vertebra, an opposite inferior side for contacting the inferior vertebra, and an instrument connection feature;
and
an instrument comprising an implant connection feature and a friction-reducing feature, wherein the instrument is connectable to the implant, wherein the instrument comprises first, second, and third states;
wherein in the first state, the implant connection feature is in an unlocked state and the friction-reducing feature is in a disengaged state, wherein in the unlocked state, the implant connection feature is not fixed to the instrument connection feature, wherein when the instrument is connected to the implant and the friction-reducing feature is in the disengaged state, the friction-reducing feature is spaced apart from the implant so that no portion of the instrument extends over the superior side of the implant;
wherein in the second state, the implant connection feature is in a locked state and the friction-reducing feature is in an engaged state, wherein when the instrument is connected to the implant and the implant connection feature is in the locked state, the implant connection feature is fixed to the instrument connection feature, wherein when the instrument is connected to the implant and the friction-reducing feature is in the engaged state, the friction-reducing feature engages the superior side of the implant in a manner that reduces overall friction of insertion of the implant between the superior vertebra and the inferior vertebra;
wherein when the instrument is connected to the implant and the instrument is in the second state, no portion of the instrument extends over the inferior side of the implant;
wherein in the third state, the implant connection feature is in the locked state and the friction-reducing feature is in the disengaged state.

4 more elements

A system for spinal surgery in an intervertebral space between a superior vertebra and an inferior vertebra, the system comprising:

an implant for implantation in the intervertebral space, the implant comprising:
a superior side configured to contact the superior vertebra;
an opposite inferior side configured to contact the inferior vertebra;
and
an instrument connection feature;
and
an instrument comprising:
an implant connection feature connectable to the instrument connection feature;
and
a friction-reducing feature comprising:
an engaged state in which the friction-reducing feature covers at least part of the superior side in a manner that reduces friction between the superior side and the superior vertebra;
and
a disengaged state in which the friction-reducing feature is withdrawn such that the friction-reducing feature does not reduce the friction;
wherein, in the engaged state, the instrument does not cover any part of the inferior side.

11 more elements

A system for spinal surgery in an intervertebral space between a superior vertebra and an inferior vertebra, the system comprising:

an implant for implantation in the intervertebral space, the implant comprising:
a superior side configured to contact the superior vertebra;
an opposite inferior side configured to contact the inferior vertebra;
and
an instrument connection feature;
and
an instrument comprising:
an implant connection feature connectable to the instrument connection feature;
and
a friction-reducing feature comprising:
an engaged state in which the friction-reducing feature covers at least part of the superior side in a manner that reduces friction between the superior side and the superior vertebra;
and
a disengaged state in which the friction-reducing feature is withdrawn such that the friction-reducing feature does not reduce the friction;
wherein:
the superior side defines a superior profile;
the inferior side defines an inferior profile;
and
in the engaged state, the friction-reducing feature extends superiorly beyond at least part of the superior profile and the inferior profile is left exposed to the inferior vertebra.

15 more elements

A system for spinal surgery in an intervertebral space between a superior vertebra and an inferior vertebra, the system comprising:

an implant for implantation in the intervertebral space, the implant comprising:
a superior side configured to contact the superior vertebra;
an opposite inferior side configured to contact the inferior vertebra;
and
an instrument connection feature;
and
an instrument comprising:
an implant connection feature connectable to the instrument connection feature;
and
a friction-reducing feature comprising:
an engaged state in which the friction-reducing feature covers at least part of the superior side in a manner that reduces friction between the superior side and the superior vertebra;
and
a disengaged state in which the friction-reducing feature is withdrawn such that the friction-reducing feature does not reduce the friction;
wherein:
the superior side comprises superior teeth that extend superiorly to engage the superior vertebra;
the inferior side comprises inferior teeth that extend inferiorly to engage the inferior vertebra;
and
in the engaged state, the friction-reducing feature prevents the superior teeth from fully engaging the superior vertebra while allowing the inferior teeth to engage the inferior vertebra.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/717,840Filed 17 Dec 2019 · us provisional application
Priority: 20 Dec 2018
Published: US 2020/0197050 A125 Jun 2020
Granted: 27 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

A61F 2/4465
For the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages: having a circular or kidney shaped…
A61B 17/1757
Specially adapted for particular parts of the body: for the spine
A61B 17/8605
Pins or screws or threaded wires; nuts therefor: heads, i.e. proximal ends projecting from bone
A61F 2/44
Joints: for the spine, e.g. vertebrae or spinal discs