K Number
K052131
Manufacturer
Date Cleared
2005-09-28

(54 days)

Product Code
Regulation Number
888.3050
Reference & Predicate Devices
Predicate For
AI/MLSaMDIVD (In Vitro Diagnostic)TherapeuticDiagnosticis PCCP AuthorizedThirdpartyExpeditedreview
Intended Use

The EXPEDIUM™ Spine System is intended for noncervical pedicle fixation and nonpedicle fixation for the following indications: degenerative disc disease (defined as back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies); spondylolisthesis; trauma (i.e., fracture or dislocation); spinal stenosis; curvatures (i.e., scoliosis, kyphosis, and/or lordosis); tumor; pseudoarthrosis; and failed previous fusion in skeletally mature patients.

The MOSS MIAMI™ Spine System is a pedicle screw system intended to provide immobilization and stabilization of spinal segments in skeletally mature patients as an adjunct to fusion in the treatment of the following acute and chronic instabilities or deformities of the thoracic, lumbar, and sacral spine: degenerative spondylolisthesis with objective evidence of neurological impairment, fracture, dislocation, scoliosis, kyphosis, spinal tumor, and failed previous fusion (pseudarthrosis). The MOSS MIAMI™ Spine Systems is also indicated for pedicle screw fixation for the treatment of severe spondylolisthesis (Grades 3 and 4) of the L5-S1 vertebra in skeletally mature patients receiving fusion by autogenous bone graft having implants attached to the lumbar and sacral spine (L3 to sacrum) with removal of the implants after the attainment of a solid fusion. The MOSS MIAMI™ Spine System is also a hook and sacral/iliac screw fixation system of the noncervical spine indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (fracture and/or dislocation), spinal stenosis, deformities (scoliosis, lordosis and/or kyphosis), tumor, and previous failed fusion (pseudarthrosis). The EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods may be used with mating titanium alloy components of the MOSS MIAMI™ Spine System which can accept a 5.5 mm diameter rod.

The MONARCH™ Spine System is a pedicle screw system intended to provide immobilization and stabilization of spinal segments in skeletally mature patients as an adjunct to fusion in the treatment of the following acute and chronic instabilities or deformities of the thoracic, lumbar, and sacral spine: degenerative spondylolisthesis with objective evidence of neuroloqical impairment, fracture, dislocation, scoliosis, kyphosis, spinal tumor, and failed previous fusion (pseudarthrosis). The MONARCH™ Spine System is also indicated for pedicle screw fixation for the treatment of severe spondylolisthesis (Grades 3 and 4) of the L5-S1 vertebra in skeletally mature patients receiving fusion by autoqenous bone graft having implants attached to the lumbar and sacral spine (L3 to sacrum) with removal of the implants after the attainment of a solid fusion. The MONARCH™ Spine System is also a hook and sacralliliac screw fixation system of the noncervical spine indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (fracture and/or dislocation), spinal stenosis, deformities (scoliosis, lordosis and/or kyphosis), tumor, and previous failed fusion (pseudarthrosis). The MONARCH™ Spine System when used with pedicle screws are indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies). Levels of fixation are for the thoracic, lumbar and sacral spine. The MONARCH™ Spine System Dual Rod Connectors can be used to connect MONARCH Spine System Rods to rods of other DePuy Spine 4.75mm, 5.5mm, and 6.35mm diameter rod systems. The EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods may be used with mating titanium alloy components of the MONARCH™ Spine System which can accept a 5.5 mm diameter rod.

Device Description

The EXPEDIUM™ Spine System Commercially Pure Titanium Spinal Rods are 5.5mm diameter rods available in various lengths. The rods are designed for use with previously cleared titanium alloy components of the EXPEDIUM™ Spine System, MOSS MIAMI™ Spinal System, and MONARCH™ Spine System which can accept a 5.5mm spinal rod, including monoaxial and polyaxial screws, hooks, and connectors. The rods will be labeled as components of the EXPEDIUM™ Spine System.

The Commercially Pure Titanium Rods are 5.5mm diameter spinal rods available in various lengths. The rods are designed for use with previously cleared titanium alloy components of the MOSS MIAMI™ Spinal System which can accept a 5.5mm spinal rod, including screws, hooks, and connectors.

The Commercially Pure Titanium Rods are 5.5mm diameter spinal rods available in various lengths. The rods are designed for use with previously cleared titanium alloy components of the MONARCH™ Spinal System which can accept a 5.5mm spinal rod, including screws, hooks, and connectors.

AI/ML Overview

Here's an analysis of the provided text regarding the acceptance criteria and study for the EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Spinal Rods:

Based on the provided 510(k) summary, the device is a medical implant (spinal rods), and the "acceptance criteria" and "study" are related to biomechanical performance rather than diagnostic accuracy or AI performance. Therefore, many of the requested fields (like sample size for test set, data provenance, number of experts, adjudication method, MRMC study, standalone study, and training set details) are not applicable in this context.

Acceptance Criteria and Device Performance

Acceptance CriteriaReported Device Performance
Biomechanical characteristics (Implied)Biomechanical test data were submitted to characterize the EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Spinal Rods. (This implies that the device met pre-defined biomechanical standards or was demonstrated to be equivalent to predicate devices based on these tests, though the specific criteria and results are not detailed in the summary.) The materials used conform to ASTM F-67 (Grade 3 commercially pure titanium), which is a material standard.

Study Details (Biomechanical Performance)

  1. Sample size used for the test set and the data provenance: Not explicitly stated. Biomechanical testing typically involves a set number of samples for various tests (e.g., fatigue, static bending), but the exact numbers are not detailed in this summary. The data provenance would be from laboratory testing.
  2. Number of experts used to establish the ground truth for the test set and the qualifications of those experts: Not applicable. For biomechanical testing of an implant, the "ground truth" is defined by standardized test methods (e.g., ASTM standards) and engineering principles, not expert medical consensus.
  3. Adjudication method for the test set: Not applicable. Biomechanical tests rely on objective measurement and predetermined pass/fail criteria based on engineering standards.
  4. If a multi-reader multi-case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance: Not applicable. This is a biomechanical study, not a diagnostic imaging or AI-assisted clinical study.
  5. If a standalone (i.e., algorithm only without human-in-the-loop performance) was done: Not applicable. This is a biomechanical study, not related to an algorithm's performance.
  6. The type of ground truth used (expert consensus, pathology, outcomes data, etc.): The ground truth for this type of device (spinal rods) is based on engineering standards and established biomechanical properties (e.g., strength, stiffness, fatigue resistance) as determined through laboratory testing against predicate devices and relevant ASTM standards.
  7. The sample size for the training set: Not applicable. This is not an AI/machine learning study, so there is no "training set."
  8. How the ground truth for the training set was established: Not applicable.

Summary of what the document indicates regarding the study:

The 510(k) summary states, "Biomechanical test data were submitted to characterize the EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Spinal Rod." This indicates that laboratory tests were performed to evaluate the physical and mechanical properties of the spinal rods. These tests would have been designed to ensure the rods meet the necessary performance requirements for their intended use and demonstrate substantial equivalence to the predicate devices (EXPEDIUM™ Spine System, MOSS MIAMI™ Spinal System, MONARCH™ Spine System). The material conformance to ASTM F-67 is also a key part of the characterization. The acceptance criteria would likely be implicit in demonstrating equivalent biomechanical performance to the predicate devices as per FDA guidance for spinal systems.

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・K052i31 [EXPEDIUM Spine System] Page 1 of 1

510(k) Summary

SUBMITTER:DePuy Spine, Inc.325 Paramount DriveRaynham, MA 02780
CONTACT PERSON:Liz Lavelle
DATE PREPARED:August 4, 2005
CLASSIFICATION NAME:Appliance, Fixation, Spinal InterlaminalOrthosis, Spinal Pedicle Fixation
PROPRIETARY NAME:EXPEDIUM™ Spine System 5.5mm Commercially PureTitanium Spinal Rods
PREDICATE DEVICES:EXPEDIUM™ Spine System (Merlin Spine System) -K033901MOSS MIAMI™ Spinal System - K955348MONARCH™ Spine System - K024348, K021148
DEVICE DESCRIPTION:The EXPEDIUM™ Spine System Commercially PureTitanium Spinal Rods are 5.5mm diameter rods availablein various lengths. The rods are designed for use withpreviously cleared titanium alloy components of theEXPEDIUM™ Spine System, MOSS MIAMI™ SpinalSystem, and MONARCH™ Spine System which canaccept a 5.5mm spinal rod, including monoaxial andpolyaxial screws, hooks, and connectors. The rods will belabeled as components of the EXPEDIUM™ SpineSystem.
INTENDED USE:The EXPEDIUM™ Spine System is intended for noncervicalpedicle fixation and nonpedicle fixation for the followingindications: degenerative disc disease (defined as back painof discogenic origin with degeneration of the disc confirmedby history and radiographic studies); spondylolisthesis;trauma (i.e., fracture or dislocation); spinal stenosis;curvatures (i.e., scoliosis, kyphosis, and/or lordosis); tumor;pseudoarthrosis; and failed previous fusion in skeletallymature patients.
MATERIALS:Manufactured from Grade 3 commercially pure titaniumconforming to ASTM F-67.
PERFORMANCEDATA:Biomechanical test data were submitted to characterize theEXPEDIUM™ Spine System 5.5mm Commercially PureTitanium Spinal Rod.

{1}------------------------------------------------

510(k) Summary

IX. 510(k) Summary

SUBMITTER:DePuy Spine, Inc.325 Paramount DriveRaynham, MA 02780
CONTACT PERSON:Liz Lavelle
DATE PREPARED:August 4, 2005
CLASSIFICATION NAME:Appliance, Fixation, Spinal InterlaminalOrthosis, Spinal Pedicle Fixation
PROPRIETARY NAME:5.5mm Commercially Pure Titanium Spinal Rods
PREDICATE DEVICES:EXPEDIUM™ Spine System (Merlin Spine System) -K033901MOSS MIAMI™ Spinal System - K955348MONARCH™ Spine System - K024348, K021148
DEVICE DESCRIPTION:The Commercially Pure Titanium Rods are 5.5mmdiameter spinal rods available in various lengths. The rodsare designed for use with previously cleared titanium alloycomponents of the MOSS MIAMI™ Spinal System whichcan accept a 5.5mm spinal rod, including screws, hooks,and connectors.
INTENDED USE:The MOSS MIAMI™ Spine System is a pedicle screwsystem intended to provide immobilization and stabilizationof spinal segments in skeletally mature patients as anadjunct to fusion in the treatment of the following acute andchronic instabilities or deformities of the thoracic, lumbar,and sacral spine: degenerative spondylolisthesis withobjective evidence of neurological impairment, fracture,dislocation, scoliosis, kyphosis, spinal tumor, and failedprevious fusion (pseudarthrosis).The MOSS MIAMI™ Spine Systems is also indicated forpedicle screw fixation for the treatment of severespondylolisthesis (Grades 3 and 4) of the L5-S1 vertebra inskeletally mature patients receiving fusion by autogenousbone graft having implants attached to the lumbar andsacral spine (L3 to sacrum) with removal of the implantsafter the attainment of a solid fusion.

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· K052131 [Moss Miami Spine System] Page 2 of 2

The MOSS MIAMI™ Spine System is also a hook and sacral/iliac screw fixation system of the noncervical spine indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (fracture and/or dislocation), spinal stenosis, deformities (scoliosis, lordosis and/or kyphosis), tumor, and previous failed fusion (pseudarthrosis).

The EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods may be used with mating titanium alloy components of the MOSS MIAMI™ Spine System which can accept a 5.5 mm diameter rod.

MATERIALS: Manufactured from Grade 3 commercially pure titanium conforming to ASTM F-67.

PERFORMANCE DATA:

Biomechanical test data were submitted to characterize the 5.5mm Commercially Pure Titanium Spinal Rods.

{3}------------------------------------------------

510(k) Summary

'

SUBMITTER:DePuy Spine, Inc.325 Paramount DriveRaynham, MA 02780
CONTACT PERSON:Liz Lavelle
DATE PREPARED:August 4, 2005
CLASSIFICATION NAME:Appliance, Fixation, Spinal InterlaminalOrthosis, Spinal Pedicle Fixation
PROPRIETARY NAME:5.5mm Commercially Pure Titanium Spinal Rods
PREDICATE DEVICES:EXPEDIUM™ Spine System (Merlin Spine System) -K033901MOSS MIAMI™ Spinal System - K955348MONARCH™ Spine System - K024348, K021148
DEVICE DESCRIPTION:The Commercially Pure Titanium Rods are 5.5mmdiameter spinal rods available in various lengths. The rodsare designed for use with previously cleared titanium alloycomponents of the MONARCH™ Spinal System whichcan accept a 5.5mm spinal rod, including screws, hooks,and connectors.
INTENDED USE:The MONARCH™ Spine System is a pedicle screwsystem intended to provide immobilization and stabilizationof spinal segments in skeletally mature patients as anadjunct to fusion in the treatment of the following acute andchronic instabilities or deformities of the thoracic, lumbar,and sacral spine: degenerative spondylolisthesis withobjective evidence of neurological impairment, fracture,dislocation, scoliosis, kyphosis, spinal tumor, and failedprevious fusion (pseudarthrosis).The MONARCH™ Spine System is also indicated forpedicle screw fixation for the treatment of severespondylolisthesis (Grades 3 and 4) of the L5-S1 vertebra inskeletally mature patients receiving fusion by autogenousbone graft having implants attached to the lumbar andsacral spine (L3 to sacrum) with removal of the implantsafter the attainment of a solid fusion.

.

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The MONARCH™ Spine System is also a hook and sacral/iliac screw fixation system of the noncervical spine indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (fracture and/or dislocation), spinal stenosis, deformities (scoliosis, lordosis and/or kyphosis), turnor, and previous failed fusion (pseudarthrosis).

The MONARCH™ Spine System when used with pedicle screws are indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies). Levels of fixation are for the thoracic, lumbar and sacral spine.

The MONARCH™ Spine System Dual Rod Connectors can be used to connect MONARCH™ Spine System Rods to rods of other DePuy Spine 4.75mm, 5.5mm, and 6.35mm diameter rod systems.

The EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods mav be used with mating titanium alloy components of the MONARCH™ Spine System which can accept a 5.5 mm diameter rod.

  • MATERIALS: Manufactured from Grade 3 commercially pure titanium conforming to ASTM F-67.
    PERFORMANCE DATA:

Biomechanical test data were submitted to characterize the 5.5mm Commercially Pure Titanium Spinal Rods.

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Image /page/5/Picture/1 description: The image is a black and white logo for the U.S. Department of Health and Human Services. The logo features a stylized eagle with three curved lines representing its body and wings. The eagle is facing to the left. The text "DEPARTMENT OF HEALTH AND HUMAN SERVICES USA" is arranged in a circular pattern around the eagle.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

SEP 2 8 2005

Ms. Liz Lavelle Senior Regulatory Affairs Associate Depuy Spine 325 Paramount Drive Raynham, Massachusetts ()2767

Rc: K052131

Trade Name: Expedium™ Spine System, Moss Miami™ Spine System and Monarch™ Spine System (Addition of 5.5 CP Ti Rods) Regulation Number: 21 CFR 888.3070 Regulation Name: Pedicle Screw Spinal System Regulatory Class: III Product Code: NKB. MNI. MNH. KWP. KWQ Dated: September 2. 2005 Received: September 6, 2005

Dear Ms. Lavelle:

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976. the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food. Drug. and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations. Title 21, Parts 800 to 898. In addition. FDA may publish further announcements concerning your device in the Federal Register.

Please be advised that FDA`s issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act s requirements, including, but not limited to: registration and fisting (21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

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Page 2 -- Ms. Liz Lavelle

This letter will allow you to begin marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Office of Compliance at (240) 276-0120. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrl/industry/support/index.html.

Sincerely yours,

Mark N. Milhim

Mark N. Melkerson Acting Director Division of General, Restorative and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosures

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Indications for Use lll.

510(k) Number (if known): K052131

Device Name: EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods

Indications For Use:

The EXPEDIUM™ Spine System is intended for noncervical pedicle fixation and nonpedicle fixation for the following indications: degenerative disc disease (defined as back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies); spondylolisthesis; trauma (i.e., fracture or dislocation); spinal stenosis; curvatures (i.e., scoliosis, kyphosis, and/or lordosis); tumor; pseudoarthrosis; and failed previous fusion in skeletally mature patients.

Prescription Use × (Part 21 CFR 801 Subpart D) AND/OR

Over-The-Counter Use (21 CFR 807 Subpart C)

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

510(k) Number_

Martin H. Wilkinson

(Division Sign-Off) Division of General, Restorative, and Neurological Devices

K053131

{8}------------------------------------------------

III. Indications for Use

510(k) Number (if known): K052131

Device Name: 5.5mm Commercially Pure Titanium Rods to MONARCH™ Spine System

Indications For Use:

The MONARCH™ Spine System is a pedicle screw system intended to provide immobilization and stabilization of spinal segments in skeletally mature patients as an adjunct to fusion in the treatment of the following acute and chronic instabilities or deformities of the thoracic, lumbar, and sacral spine: degenerative spondylolisthesis with objective evidence of neuroloqical impairment, fracture, dislocation, scoliosis, kyphosis, spinal tumor, and failed previous fusion (pseudarthrosis).

The MONARCH™ Spine System is also indicated for pedicle screw fixation for the treatment of severe spondylolisthesis (Grades 3 and 4) of the L5-S1 vertebra in skeletally mature patients receiving fusion by autoqenous bone graft having implants attached to the lumbar and sacral spine (L3 to sacrum) with removal of the implants after the attainment of a solid fusion.

The MONARCH™ Spine System is also a hook and sacralliliac screw fixation system of the noncervical spine indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (fracture and/or dislocation), spinal stenosis, deformities (scoliosis, lordosis and/or kyphosis), tumor, and previous failed fusion (pseudarthrosis).

The MONARCH™ Spine System when used with pedicle screws are indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies). Levels of fixation are for the thoracic, lumbar and sacral spine.

The MONARCH™ Spine System Dual Rod Connectors can be used to connect MONARCH Spine System Rods to rods of other DePuy Spine 4.75mm, 5.5mm, and 6.35mm diameter rod systems.

The EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods may be used with mating titanium alloy components of the MONARCH™ Spine System which can accept a 5.5 mm diameter rod

Prescription Use X (Part 21 CFR 801 Subpart D) AND/OR

Over-The-Counter Use (21 CFR 807 Subpart C)

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

DePuy Spine, Inc. Special 510(k)

510(k) Number

{9}------------------------------------------------

lll. Indications for Use

510(k) Number (if known): K052131

Device Name: 5.5mm Commercially Pure Titanium Rods to MOSS MIAMI™ Spine System

Indications For Use:

The MOSS MIAMI™ Spine System is a pedicle screw system intended to provide immobilization and stabilization of spinal segments in skeletally mature patients as an adjunct to fusion in the treatment of the following acute and chronic instabilities or deformities of the thoracic, lumbar, and sacral spine: degenerative spondylolisthesis with objective evidence of neurological impairment, fracture, dislocation, scoliosis, kyphosis, spinal tumor, and failed previous fusion (pseudarthrosis).

The MOSS MIAMI™ Spine Systems is also indicated for pedicle screw fixation for the treatment of severe spondylolisthesis (Grades 3 and 4) of the L5-S1 vertebra in skeletally mature patients receiving fusion by autogenous bone graft having implants attached to the lumbar and sacral spine (L3 to sacrum) with removal of the implants after the attainment of a solid fusion,

The MOSS MIAMI™ Spine System is also a hook and sacral/iliac screw fixation system of the noncervical spine indicated for degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (fracture and/or dislocation), spinal stenosis, deformities (scoliosis, lordosis and/or kyphosis), tumor, and previous failed fusion (pseudarthrosis).

The EXPEDIUM™ Spine System 5.5mm Commercially Pure Titanium Rods may be used with mating titanium alloy components of the MOSS MIAMI™ Spine System which can accept a 5.5 mm diameter rod.

Prescription Use × (Part 21 CFR 801 Subpart D)

AND/OR

Over-The-Counter Use (21 CFR 807 Subpart C)

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

Mar-

(Division Sign-Off) and Ne

DePuy Spine, Inc. Special 510(k)

510(k) Number

§ 888.3050 Spinal interlaminal fixation orthosis.

(a)
Identification. A spinal interlaminal fixation orthosis is a device intended to be implanted made of an alloy, such as stainless steel, that consists of various hooks and a posteriorly placed compression or distraction rod. The device is implanted, usually across three adjacent vertebrae, to straighten and immobilize the spine to allow bone grafts to unite and fuse the vertebrae together. The device is used primarily in the treatment of scoliosis (a lateral curvature of the spine), but it also may be used in the treatment of fracture or dislocation of the spine, grades 3 and 4 of spondylolisthesis (a dislocation of the spinal column), and lower back syndrome.(b)
Classification. Class II.