TRI-POLAR SYSTEM

K991990 · Biomet, Inc. · KWY · Sep 10, 1999 · Orthopedic

Device Facts

• Record ID: K991990
• Device Name: TRI-POLAR SYSTEM
• Applicant: Biomet, Inc.
• Product Code: KWY · Orthopedic
• Decision Date: Sep 10, 1999
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 888.3390
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

The Tri-Polar System is indicated for use in patients requiring total reconstruction of the hip joint due to the following: a.) Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis b.) Rheumatoid arthritis. c.) Correction of functional deformity. d.) Treatment of non-union, femoral neck fracture, and trochanteric fractures of the proximal femur with head involvement, unmanageable using other techniques. e.) Revision of previously failed total hip arthroplasty due to recurrent dislocations. The Tri-Polar System is intended for cemented or press-fit application for general use in skeletally mature individuals undergoing surgery for rehabilitating hip joints.

Device Story

Tri-Polar System is a hip arthroplasty implant; combines Bi-Polar femoral head with acetabular liner and shell. Input: surgical site anatomy; Output: artificial hip joint articulation. Operates by adding an acetabular bearing component to a Bi-Polar hip replacement; liner locks into acetabular shell via RingLoc mechanism; prevents rotation via scalloped semi-circles. Used in clinical orthopedic surgery by physicians. Benefits: provides stable hip joint reconstruction; utilizes polyethylene thickness of 4.8mm (exceeds 4.0mm standard).

Clinical Evidence

No clinical data provided; bench testing only.

Technological Characteristics

Materials: polyethylene, metal-backed acetabular shells. Components: Bi-Polar femoral head, acetabular liner, femoral stem. Features: RingLoc locking mechanism, scalloped semi-circles for rotation prevention, embedded wire for x-ray visualization, concentric rings for cement interdigitation. Polyethylene thickness: 4.8mm. Sterilization: not specified.

Indications for Use

Indicated for skeletally mature patients requiring total hip reconstruction due to non-inflammatory degenerative joint disease (osteoarthritis, avascular necrosis), rheumatoid arthritis, functional deformity, or proximal femur fractures (non-union, femoral neck, trochanteric) unmanageable by other techniques, and for revision of failed total hip arthroplasty due to recurrent dislocations.

Regulatory Classification

Identification

A hip joint femoral (hemi-hip) metal/polymer cemented or uncemented prosthesis is a two-part device intended to be implanted to replace the head and neck of the femur. This generic type of device includes prostheses that have a femoral component made of alloys, such as cobalt-chromium-molybdenum, and a snap-fit acetabular component made of an alloy, such as cobalt-chromium-molybdenum, and ultra-high molecular weight polyethylene. This generic type of device may be fixed to the bone with bone cement (§ 888.3027) or implanted by impaction.

Predicate Devices

• THARIES Surface Replacement System
• Indiana Conservative Hip
• Mallory Head Total Hip

Submission Summary (Full Text)

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SEP 1 0 1999

# SUMMARY OF SAFETY AND EFFECTIVENESS

| SPONSOR: | Biomet, Inc.<br>P.O. Box 587<br>Airport Industrial Park<br>Warsaw, Indiana 46581-0587 |
|----------------------|--------------------------------------------------------------------------------------------------------------------------|
| CONTACT PERSON: | Michelle L. McKinley |
| DEVICE NAME: | Tri-Polar System |
| CLASSIFICATION NAME: | Prosthesis, hip, semi-constrained metal/polymer, cemented<br>Prosthesis, hip, semi-constrained metal/polymer, uncemented |

#### INTENDED USE:

The Tri-Polar System is indicated for use in patients requiring total reconstruction of the hip joint due to the following:

- a.) Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis
- b.) Rheumatoid arthritis.
- c.) Correction of functional deformity.
- d.) Treatment of non-union, femoral neck fracture, and trochanteric fractures of the proximal femur with head involvement, unmanageable using other techniques.
- e.) Revision of previously failed total hip arthroplasty due to recurrent dislocations.

The Tri-Polar System is intended for cemented or press-fit application for general use in skeletally mature individuals undergoing surgery for rehabilitating hip joints.

#### DEVICE DESCRIPTION:

The Tri-Polar prosthesis consists of a Bi-Polar femoral head, which articulates with a mating acetabular liner that fits into any standard line acetabular component. Once the Bi-Polar femoral head is used with an acetabular component the device becomes the Tri-Polar.

The Tri-Polar System consists of an all polyethylene or metal backed acetabular cup with a polyethylene liner designed to fit on a Bi-Polar head. The Bi-Polar femoral head component

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contains a modular head, which is attached to the femoral stem component. In other words, the Tri-Polar system adds an acetabular bearing component to a Bi-Polar hip replacement.

The Tri-Polar liners fit into any currently approved Biomet RingLoc® acetabular shells. The liner is retained in the shell by means of Biomet's standard RingLoc® mechanism. (A current listing of shells is found in Exhibit I). The liner and shell are properly aligned with one another and then locked into position with a metal ring (RingLoc®). The metallic shell has six to eight scalloped semi-circles, which mate with analogous semi-circular cutouts on the liner for prevention of rotation.

Biomet's all polyethylene acetabular cup has two outer concentric rings to facilitate cement interdigitation and an embedded wire for x-ray visualization. The all polyethylene has two outer concentric rings to facilitate cement interdigitation and an embedded wire for x-ray visualization. The all polyethylene acetabular component is intended to be cemented in the aceatabulum or used with a Biomet recovery cage.

The Bi-Polar femoral head consists of a larger outer shell with a polyethylene insert, which contains within it a modular head. The modular head is captured by the polyethylene insert, which is captured by means of a RingLoc® mechanism similar to that previously described above. The 22mm Bi-Polar component c. 1 be used with either size 24 or 25 Tri-Polar liners or the 54, or 57 all polyethylene cup. While the 28mm Bi-Polar component can be used with either size 26, 27, or 28 Tri-Polar liners or the 63, 66, or 69 all polyethylene cup. A polyethylene thickness of 4.0mm is the general standard for a hip prosthesis. The Tri-Polar system utilizes a minimum thickness of 4.8mm, which is greater than the general standard.

The Tri-Polar System does not incorporate any new technology that has not previously been available. The device simply combines this technology.

### POTENTIAL RISKS:

The potential risks associated with this device are the same as with any joint replacement device. These include, but are not limited to:

- Fracture of the component Cardiovascular disorders Implant loosening/migration Soft tissue imbalance Deformity of the joint Tissue growth failure Delayed wound healing Metal sensitivity
- Bone fracture Hematoma Blood vessel damage Nerve damage Excessive wear Infection Dislocation Breakdown of the porous surface

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## SUBSTANTIAL EQUIVALENCE:

The Tri-Polar Acetabular System is similar to previously marketed devices. The device is similar to a traditional hip device consisting of a femoral stem, modular head, and metal backed polyethylene component, with the addition of a Bi-Polar bearing surface between the modular head and acetabular bearing surface. Direct comparison was made with the following predicates:

THARIES Surface Replacement System Indiana Conservative Hip Mallory Head Total Hip

# 000137

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Image /page/3/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo features a stylized eagle or bird-like symbol with three curved lines representing its body and wings. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" is arranged in a circular fashion around the symbol.

Public Health Service

SEP 1 0 1999

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

Ms. Michelle L. McKinley Regulatory Specialist Biomet, Inc. P.O. Box 587 Warsaw, Indiana 46581-0587

Re: K991990 Trade Name: TriPolar System Regulatory Class: II Product Code: KWY and LPH Dated: June 4, 1999 Received: June 14, 1999

Dear Ms. McKinley:

We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to 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). 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 (Premarket Approval), 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 895. A substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirement, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic (QS) inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.

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#### Page 2 - Ms. Michelle L. McKinley

This letter will allow you to begin marketing your device as described in your 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 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at [phone]. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at [phone]. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number [phone] or [phone] or at its Internet address "http://www.fda.gov/cdrh/dsmamain.html".

Sincerely yours,

to colle

Celia M. Witten, Ph.D., M.D. Director Division of General and Restorative Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Page | of |

510(k) Number if Known:_K991990 Device Name: Tri-Polar System

The indications for use are:

ﻟﻢ ﺍﻟﻤﺴﺎﻫﻤﺔ ﺍﻟﻤﺴﺘﻤﺮ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍﻟﻤﺴﺘﻮﻯ ﺍ .

- a.) Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis.
- b.) Rheumatoid arthritis
- c.) Correction of functional deformity
- d.) Treatment of non-union, femoral neck fracture, and trochanteric fractures of the proximal femur with head involvement, unmanageable using other techniques.
- e.) Revision of previously failed total hip arthroplasty due to recurrent dislocation.

The Tri-Polar System is intended for cemented or ress-fit application for general use in skeletally mature individuals undergoing surgery for rehabilitating hip joints.

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

Concurrence of CDRH, Office of Device Evaluation (ODE)

Prescription Use _ X (Per CFR 801.109)

or Over the Counter Use (Optional Format 1-2-96)

bcoolly
Division Sign-Off

(Division agn-om
Division of General Restorative Devices K991990
510(k) Number.

000004