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US 7,604,640 B2Granted
Device and system for applying rotary impact
AssigneeZimmer Spine Austin, Inc.
InventorRichard J. Kana
Life of this patent
Estimating the term…
Abstract
A device and system for applying rotational impact to screws implanted in bony tissues. Specifically, embodiments of the present disclosure may provide medical professionals the ability to apply impact forces and torques to a threaded member in a rotational plane such that the surrounding tissues are not damaged from an axial impact or excessive rotational forces. The rotary impact driver may be used with thin and flexible shafts for percutaneous procedures.
Claims14
A device for applying rotary impact comprising:
- a torsion spring defined by a diameter and width and having a first end and a second end;
- a body comprising
- a proximal end configured for rigid attachment to a tool;
- a spring cavity disposed on a longitudinal axis for retaining at least a portion of the torsion spring;
- an opening configured for fixed connection to the first end of the torsion spring;
- and
- a shaft cavity disposed on the longitudinal axis for retaining at least a portion of a shaft;
- a shaft assembly comprising:
- a shaft comprising a proximal end adapted for rotatable connection to the body and a distal end adapted for connection to a driver tip;
- and
- an impact disk rigidly connected to the shaft comprising
- one or more contact sections defined by an arc length and profile for slidable contact with the second end of the torsion spring and one or more non-contact sections of selected arc length separating the one or more contact sections,
- wherein rotation of the body about the shaft when the second end is in contact with a first contact section changes the torsion spring configuration to generate potential energy in the torsion spring, and
- wherein further rotation of the body about the shaft causes the second end to be in a non-contact section, wherein the torsion spring is configured to convert the generated potential energy into kinetic energy when the second end is in the non-contact section, causing the second end to transition across the non-contact section and contact a second contact section, wherein the contact with the second contact section converts the kinetic energy in the torsion spring to a rotary impact on the shaft.
11 more elements
A method for applying rotational impact to a bone anchor comprising:
- detachably connecting a driver tip for a rotary impact driver to the head of a bone anchor, wherein the rotary impact driver comprises
- a torsion spring having a first end and a second end;
- a body comprising
- a spring cavity disposed on a longitudinal axis for retaining at least a portion of the torsion spring;
- an adaptation for fixed connection to the first end of the torsion spring;
- and
- a shaft cavity disposed on the longitudinal axis for retaining at least a portion of a shaft;
- a shaft assembly comprising
- a shaft comprising a proximal end adapted for rotatable connection to the body and a distal end adapted for connection to the driver tip;
- and
- an impact disk rigidly connected to the shaft comprising
- one or more contact sections defined by an arc length for slidable contact with the second end of the torsion spring and
- one or more non-contact sections of selected arc length separating the one or more contact sections;
- rotating the body about the shaft when the second end is in contact with a contact section, wherein such the torsion spring configuration changes to generate potential energy in the torsion spring;
- and
- further rotating the body about the shaft to cause the second end to be in a non-contact section, wherein the torsion spring is configured to convert the generated potential energy into kinetic energy when the second end is in the non-contact section, causing the second end to transition across the non-contact section and contact a second contact section, wherein the contact with the second contact section converts the kinetic energy in the torsion spring to a rotational impact on the shaft.
13 more elements
A system for applying rotational impact to a threaded anchor, comprising:
- a torsion spring defined by a diameter and width and having a first end and a second end;
- a body comprising
- a proximal end configured for rigid attachment to a tool;
- a spring cavity disposed on a longitudinal axis for retaining at least a portion of the torsion spring;
- an opening configured for fixed connection to the first end of the torsion spring;
- and
- a shaft cavity disposed on the longitudinal axis for retaining at least a portion of a shaft;
- a shaft assembly comprising
- a shaft comprising a proximal end adapted for rotatable connection to the body and a distal end adapted for connection to a driver tip;
- and
- an impact disk rigidly connected to the shaft comprising
- one or more contact sections defined by an arc length and profile for slidable contact with the second end of the torsion spring and
- one or more non-contact sections of selected arc length separating the one or more contact sections,
- wherein rotation of the body about the shaft when the second end is in contact with a first contact section changes the torsion spring configuration to generate potential energy in the torsion spring, and
- wherein further rotation of the body about the shaft causes the second end to be in a non-contact section, wherein the torsion spring is configured to convert the generated potential energy into kinetic energy when the second end is in the non-contact section, causing the second end to transition across the non-contact section and contact a second contact section, wherein the contact with the second contact section converts the kinetic energy in the torsion spring to a rotary impact on the shaft;
- and
- a tool configured for attachment to the proximal end of the body.
14 more elements
Dependencies are inferred from the claim text.