Reaxon® Plus is indicated for repair of peripheral nerve discontinuities up to 10 mm and where gap closure can be achieved by flexion of the extremity.

Device Description

Reaxon® Plus is a flexible and transparent chitosan based implant designed for repair of peripheral nerve discontinuities up to 10mm and where gap closure can be achieved by flexion of the extremity.

Reaxon® Plus was developed to provide a protective environment for axonal growth across a nerve gap. When hydrated, Reaxon® Plus is an easy to handle, soft, pliable, transparent chitosan tube. Reaxon® Plus is provided sterile, non-pyrogenic, for single use in double blister packages in a variety of sizes as shown below.

AI/ML Overview

The provided text is a 510(k) Summary for the Reaxon® Plus device, a nerve cuff. This type of document is for regulatory purposes to demonstrate substantial equivalence to a predicate device, not typically for reporting on a clinical effectiveness study with acceptance criteria in the way medical AI devices often do (e.g., sensitivity, specificity for diagnostic tasks).

Therefore, some of the requested information, specifically related to "acceptance criteria" for diagnostic performance, "sample size for the test set," "number of experts," "adjudication method," "multi-reader multi-case (MRMC) comparative effectiveness study," "standalone performance," and "training set details" are not applicable or explicitly stated in this document because it outlines a series of biocompatibility and performance bench tests for a physical medical implant.

However, I can extract the "acceptance criteria" and "reported device performance" from the various tests conducted to demonstrate the safety and effectiveness of the Reaxon® Plus. These criteria are more about meeting safety standards and functional requirements compared to the predicate device.

Here's a breakdown of the available information:

1. Table of Acceptance Criteria and Reported Device Performance:

Test Name	Acceptance Criteria	Reported Device Performance
Cytotoxicity	Grade less than 2 (mild reactivity) - No evidence of cell lysis or toxicity.	No cytotoxicity. No evidence of cell lysis or toxicity. The test article extract met the requirements, with a grade less than a grade 2.
Acute Systemic Toxicity	No mortality or evidence of systemic toxicity.	No mortality or evidence of systemic toxicity from the extracts injected into mice. Each test article extract met the requirements.
Sensitization	No evidence of causing delayed dermal contact sensitization.	The test article extracts showed no evidence of causing delayed dermal contact sensitization in the guinea pig. It was not considered a sensitizer.
Irritation/Intracutaneous Reactivity	Difference between test extract overall mean score and corresponding control overall mean score is 0.0 for Sodium chloride and 0.2 for Sesame Oil.	No irritation. The stated differences were met.
Subacute Toxicity	No evidence of systemic toxicity. Classified as non-irritant compared to the control.	No subacute toxicity. No evidence of systemic toxicity from the test article following subcutaneous implantation in the rat. Classified as non-irritant compared to the control article.
Implantation (Local Tissue Response)	Macroscopic reaction not significant compared to negative control. Microscopically, classified as non-irritant compared to negative control.	The macroscopic reaction was not significant as compared to the negative control article. Microscopically, the test article was classified as a non-irritant as compared to the negative control article.
Pyrogenicity	Total rise of rabbit temperatures during the 3-hour observation period within acceptable USP limits.	Non-pyrogenic. The total rise of rabbit temperatures was within acceptable USP limits.
Genotoxicity (Bacterial Reverse Mutation)	No mutagenic changes (no two-fold or greater increase in revertants compared to negative control plates).	The DMSO and saline test article extracts were considered to be nonmutagenic to S. typhimurium and E. coli tester strains.
Genotoxicity (Mouse Lymphoma Assay)	No two-fold or greater increase in the mean mutant frequency.	The RPMIo and DMSO test article extracts did not cause a two-fold or greater increase in the mean mutant frequency of the L5178Y/TK* cell line. The test article was not mutagenic.
Genotoxicity (Mouse Peripheral Blood Micronucleus)	No induction of micronuclei.	The test article extracts did not induce micronuclei in mice.
Long-term Implantation	Slow degradation process and very mild tissue response. Stability, low macrophage count, and thin fibrotic layer.	Demonstrated slow degradation and very mild tissue response. Low number of activated macrophages, good stability, and marginal signs of degradation until 50 weeks, first significant macroscopic signs at 74/77 weeks. Biological tissue response stable at 3 months, with decreasing macrophages and fibrotic layer thickness.
Dimensional/Visual Inspection	Dimensions within specified tolerances following ethylene oxide sterilization.	Verified that the dimensions of the Reaxon® Plus were within specified tolerances following ethylene oxide sterilization.
Suture Retention Strength	Sufficient strength to resist suture pull-out under loads exceeding those anticipated in the intended use environment.	Suture retention strength testing verified that Reaxon® Plus has sufficient strength to resist suture pull-out under loads exceeding those anticipated in the intended use environment.
Compression and Rebound Analysis	Can withstand compressive forces greater than 0.25 N and will re-open following removal of compressive forces sufficient to collapse the nerve guide.	Compression and rebound analysis verified that the Reaxon® Plus can withstand compressive forces greater than 0.25 N and it will re-open following removal of compressive forces sufficient to collapse the nerve guide. The device is flexible to accommodate movement of joint while retaining its shape and is resistant to occlusive forces.

2. Sample Size Used for the Test Set and Data Provenance:

Cytotoxicity: Triplicate monolayers of L-929 mouse fibroblast cells.
Acute Systemic Toxicity: Five mice.
Sensitization: Ten test guinea pigs per extract, five control guinea pigs per vehicle.
Irritation/Intracutaneous Reactivity: Three rabbits, five separate injection sites on each.
Subacute Toxicity: Animals (rats) – specific number not provided but states "animals were observed."
Implantation (Local Tissue Response): Animals (rabbits) – specific number not provided.
Pyrogenicity: Three rabbits.
Genotoxicity (Bacterial Reverse Mutation): Triplicate plates for each of five tester strains (Salmonella typhimurium TA98, TA100, TA1535, TA1537, and Escherichia coli WP2uvrA) with and without metabolic activation. Parallel testing with negative and positive controls.
Genotoxicity (Mouse Lymphoma Assay): Duplicate tests for each test extract and negative control.
Genotoxicity (Mouse Peripheral Blood Micronucleus Study): Twelve mice per test article extract (six per sex), six animals per sex for negative control, and six animals per sex for positive control.
Long-term Implantation: Wistar rats, 10 mm rat sciatic nerve defect. Number of animals not specified, but various implantation times (12, 24, 50, 74/77 weeks) indicate a longitudinal study.
Dimensional/Visual Inspection: Reaxon® Plus tubes (number not specified).
Suture Retention Strength: Reaxon® Plus tubes (number not specified).
Compression and Rebound Analysis: 1 cm of each tube (number not specified).

Data Provenance: The studies are primarily in-vitro (cell cultures) and animal studies (mice, guinea pigs, rabbits, rats). The studies appear to be prospective, designed specifically for this regulatory submission. Country of origin not explicitly stated but Medovent GmbH is based in Germany.

3. Number of Experts Used to Establish Ground Truth and Qualifications:

Not applicable in the context of these biocompatibility and bench tests. The "ground truth" here is based on objective laboratory measurements, animal observations, and histological examinations by trained personnel.

4. Adjudication Method:

Not applicable. These are laboratory and animal studies with objective measurements, not subjective evaluations requiring adjudication.

5. Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study:

No, this type of study was not conducted as it is not relevant for a physical implant like a nerve cuff. This study design is typically for diagnostic imaging devices where human interpretation is involved.

6. Standalone Performance Study:

Yes, all the listed studies represent standalone performance evaluations of the Reaxon® Plus device itself, often compared against established negative/positive controls or, for mechanical aspects, against its predicate device (NeuraGen® Nerve Guide). The "standalone" here refers to the device's intrinsic properties and biological interactions as measured in a controlled setting, not an algorithm's performance.

7. Type of Ground Truth Used:

The ground truth for these studies is based on:

In-vitro measurements: (e.g., cell morphology, reactivity grades for cytotoxicity, revertant counts for genotoxicity)
Animal observations and clinical signs: (e.g., systemic toxicity, dermal reactions, body weight, pyrogenic response, general health)
Histopathology/Microscopic evaluation: (e.g., tissue response at implantation sites, cellular degeneration, macrophage presence, fibrotic layer thickness)
Mechanical and Physical Measurements: (e.g., dimensions, force required for suture retention, compression force, rebound)

8. Sample Size for the Training Set:

Not applicable. This is not an AI/machine learning device that would have a training set.

9. How the Ground Truth for the Training Set Was Established:

Not applicable.

Summary

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Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002

December 2, 2015

MEDOVENT GmbH Dr. Thomas Freier CEO Friedrich-Koenig-Str. 3 D-55129 Mainz, Germany

Re: K143711

Trade/Device Name: Reaxon® Plus Regulation Number: 21 CFR 882.5275 Regulation Name: Nerve Cuff Regulatory Class: Class II Product Code: JXI Dated: October 29, 2015 Received: November 2, 2015

Dear Dr. Freier:

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. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you; however, that device labeling must be truthful and not misleading.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to 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 listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical devicerelated adverse events) (21 CFR 803); 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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If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address

http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to

http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.

You may obtain other general information on your responsibilities under the Act from the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address

http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm.

Sincerely yours,

Carlos L. Pena -S

Carlos L. Peña, PhD, MS Director Division of Neurological and Physical Medicine Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Indications for Use

510(k) Number (if known) K143711

Device Name Reaxon® Plus

Indications for Use (Describe)

Reaxon® Plus is indicated for repair of peripheral nerve discontinuities up to 10 mm and where gap closure can be achieved by flexion of the extremity.

Type of Use (Select one or both, as applicable)
Prescription Use (Part 21 CFR 801 Subpart D)	Over-The-Counter Use (21 CFR 801 Subpart C)

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MED◎VENT GmbH
	Implants that care

Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany Tel. +496131-61769-0, Fax +496131-6176929 mail@medovent.com

Reaxon® Plus

510(k) Summary

Page 1 of 9

(as required by 21 CFR 807.92)

A. Submitted by:	MEDOVENT GmbH Friedrich-Koenig-Str. 3 D-55129 Mainz Germany Phone: +49 6131 617 690 Fax: +49 6131 617 6929 mail@medovent.com
B. Date Prepared:	Oct/16/2015
C. Contact Person:	Dr. Thomas Freier CEO Phone: + 49 6131 617 690
D. Product Name:	Reaxon® Plus
E. Common Name:	Nerve Guide
F. Classification number/name:	21 CFR 882.5275 / Nerve Cuff
G. Product Code:	JXI

H. Device description:

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Image /page/4/Picture/0 description: The image shows the logo for MEDOVENT GmbH. The logo is black, except for the "O" in MEDOVENT, which is gold. Below the company name is the tagline "Implants that care" in gray.

Page 2 of 9

Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany
Tel. +496131-61769-0, Fax +496131-6176929
mail@medovent.com

(as required by 21 CFR 807.92)

510(k) Summary

Item number	RP321	RP330	RP340	RP350	RP360
Inner diameter (mm)	2.1	3.0	4.0	5.0	6.0
Length (mm)	30	30	30	30	30
Schematics of the ID(mm) of each size	Image: circle	Image: circle	Image: circle	Image: circle	Image: circle
Real picture of eachmodel of Reaxon®Plus.

I. Intended Use:

Under supervision of a healthcare professional

Reaxon® Plus is indicated for repair of peripheral nerve discontinuities up to ● 10 mm and where gap closure can be achieved by flexion of the extremity.

J. Predicate Device:

Reaxon® Plus is substantially equivalent in function and intended use to:

. NeuraGen® Nerve Guide, which is a tubular device designed for repair of peripheral nerve discontinuities. Like the predicate device, Reaxon® Plus is provided sterile, for single use only. Reaxon® Plus and NeuraGen® Nerve Guide are both manufactured from bioresorbable materials. Reaxon® Plus meets ISO 10993 requirements for biocompatibility.
A table of comparative features may be found below.

Parameter	Device	Predicate Device
Device name	Reaxon® Plus	NeuraGen® Nerve Guide
Company Name	Medovent GmbH	Integra LifeSciencesCorporation
510(k) #	K143711	K011168
Material	Chitosan	Collagen
Indications For Use	Repair of peripheral nervediscontinuities up to 10 mmand where gap closure can	Repair of peripheral nervediscontinuities and wheregap closure can be achieved

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Image /page/5/Picture/0 description: The image shows the logo for MEDOVENT GmbH. The logo is black with a yellow circle in the middle of the word MEDOVENT. Below the company name is the tagline "Implants that care" in a smaller, gray font.

510(k) Summary

(as required by 21 CFR 807.92)

	be achieved by flexion of	by flexion of the extremity.
	the extremity.
Packaging	Double blister	Double blister
Sterilization Method	EO	EO

As indicated in the table of comparative features above, the difference between Reaxon® Plus and the predicate device is the material. As Reaxon® Plus is based on chitosan, the predicate device is based on collagen. Both chitosan and collagen are natural, animal-derived polymers that are biocompatible and biodegradable. In both Reaxon® Plus and the predicate device, the material is processed into sterile tubular nerve guides.

Given the difference between Reaxon® Plus and the predicate device, in vitro and in vivo biocompatibility testing according to ISO 10993 standards, long term implantation and bench tests on Reaxon® Plus have been performed to be used to establish substantial equivalence. These tests proved that Reaxon® Plus has a similar safety and effectiveness as its predicate device NeuraGen® Nerve guide.

Below there is a summary of each study that was performed.

Cytotoxicity

Purpose: To evaluate in vitro the cytotoxicity potential of Reaxon® Plus.

Method: A single preparation of the test article was extracted in single strength Minimum Essential Medium (IX MEM) at 37°C for 24 hours. Triplicate monolayers of L-929 mouse fibroblast cells were dosed with each extract and incubated at 37°C in the presence of 5% CO2 for 48 hours. Following incubation, the monolayers were examined microscopically for abnormal cell morphology and cellular degeneration.

Result: No cytotoxicity. No evidence of cell lysis or toxicity. The test article extract met the requirements of the test since the grade was less than a grade 2 (mild reactivity).

Acute systemic toxicity

Purpose: To evaluate for acute systemic toxicity in mice.

Method: A single dose of the extract of the test article was injected into a group of five animals, which were observed for signs of systemic toxicity immediately after injection and at 4, 24, 48 and 72 hours after injection. Body weights were recorded prior to dosing and on days 1, 2 and 3.

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Image /page/6/Picture/0 description: The image shows the logo for MEDOVENT GmbH, a company that specializes in implants. The logo is black and white, with the word "MEDOVENT" in bold letters. The "O" in MEDOVENT is a yellow circle. Below the company name is the tagline "Implants that care" in a smaller, gray font.

Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany
Tel. +496131-61769-0, Fax +496131-6176929
mail@medovent.com

510(k) Summary

Page 4 of 9

(as required by 21 CFR 807.92)

Result: There was no mortality or evidence of systemic toxicity from the extracts injected into mice. Each test article extract met the requirements of the study.

Sensitization

Purpose: to evaluate the potential of the test article to cause delayed dermal contact sensitization in the guinea pig maximization test.

Method: The test article was extracted in 0.9% sodium chloride USP and sesame oil, NF. Each extract was intradermally injected and occlusively patched to ten test guinea pigs (per extract). The extraction vehicle was similarly injected and occlusively patched to five control guinea pigs (per vehicle). Following a recovery period, the test and control animals received a challenge patch of the appropriate test article extract and the vehicle control. All sites were scored for dermal reactions at 24 and 48 hours after patch removal.

Result: The test article extracts showed no evidence of causing delayed dermal contact sensitization in the guinea pig. The test article was not considered a sensitizer in the guinea pig maximization test.

Irritation/Intracutaneous reactivity

Purpose: To evaluate for the potential to cause irritation following intracutaneous injection in rabbits.

Method: A 0.2 mL dose of the appropriate test article extract was injected intracutaneously into five separate sites on the right side of the back of each of three animals. The injection sites were observed immediately after injection. Observations for erythema and edema were conducted at 24, 48, and 72 hours after injection.

Result: No irritation. The test article met the requirements of the test since the difference between each test extract overall mean score and corresponding control overall mean score was 0.0 and 0.2 for the Sodium chloride and Sesame Oil test extracts, respectively.

Subacute toxicity

Purpose: The test articles were surgically implanted in rats to evaluate the potential systemic toxicity and local tissues response at the implantation site.

Method: Animals were observed for overt signs of toxicity. Detailed clinical examinations were conducted at pretreatment, weekly and at termination. A microscopic evaluation of the implantation sites and collected organs was conducted.

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Image /page/7/Picture/0 description: The image shows the logo for MEDOVENT GmbH. The logo is in black and bold font, with the "O" in MEDOVENT represented by a yellow circle. Below the company name is the tagline "Implants that care" in a smaller, gray font.

Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany

Tel. +496131-61769-0, Fax +496131-6176929

mail@medovent.com

510(k) Summary

Page 5 of 9

(as required by 21 CFR 807.92)

Result: No subacute toxicity. There was no evidence of systemic toxicity from the test article following subcutaneous implantation in the rat. The test article was classified as non-irritant as compared to the control article.

Implantation

Purpose: To evaluate the local tissue response of the test article implanted in muscle tissue of the rabbit.

Method: The test article and negative control were intramuscularly implanted and animals were euthanized 12 weeks later. Muscle tissues were excised and the implant sites examined macroscopically. A microscopic evaluation of representative implant sites from each animal was conducted to further define any tissue response.

Result: The macroscopic reaction was not significant as compared to the negative control article. Microscopically, the test article was classified as a non-irritant as compared to the negative control article.

Pyrogenicity

Purpose: To evaluated in the rabbit the potential for material mediated pyrogenicity.

Method: A single dose of 10 mL/kg was intravenously injected via the marginal ear vein into each of three animals. Rectal temperatures were measured and recorded prior to injection and at 30 minute intervals between 1 and 3 hours after injection.

Result: Non-pyrogenic. The total rise of rabbit temperatures during the 3 hour observation period was within acceptable USP limits. The test article was judged as non-pyrogenic.

Genotoxicity

Bacterial Reverse Mutation Study

Purpose: To evaluate whether a test article extract would cause mutagenic changes in Salmonella typhimurium tester strains TA98, TA100, TA1535, and TA1537, and Escherichia coli tester strain WP2uvrA in the presence and absence of mammalian metabolic activation.

Method: Tubes containing molten top agar were inoculated with culture from one of the five tester strains, along with the DMSO or saline extract. An aliquot of sterile water for injection or rat liver S9 homogenate, providing metabolic activation, was added. The mixture was poured across triplicate plates. Parallel testing was conducted with negative controls (extraction vehicle alone) and positive controls. The mean

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Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany
Tel. +496131-61769-0, Fax +496131-6176929
mail@medovent.com

510(k) Summary

Page 6 of 9

(as required by 21 CFR 807.92)

number of revertants for the test extract plates was compared to the mean number of revertants of the negative control plates for each of the five tester strains.

Result: The DMSO and saline test article extracts were considered to be nonmutagenic to S. typhimurium tester strains TA98, TA100, TA1535, and TA1537, and Escherichia coli tester strain WP2uvrA.

Mouse Lymphoma Assay

Purpose: To evaluate whether the test article extract induced gene mutations and chromosomal damage in mammalian cells.

Method: The test article was soaked in sufficient volume (100 mL for the extraction in DMSO and 500 mL for the extraction in RPMIo) of 0.9% sodium chloride (SC) to fully cover and submerge the sample. The test article was soaked for 10 minutes. The test article was removed from the saline, weighed, placed in a tightly capped vial, and delivered to the laboratory for immediate extraction. The test article and each of the negative controls (extraction vehicle without the test article) were subjected to the extraction. The RPMIo extract was supplemented to a 3% serum concentration prior to the 4 hour treatments and to a 10% serum concentration for the 24 hour treatment. The DMSO extract was diluted to a final concentration of 1.0% with RPMI3 for the 4 hour treatments and with RPMIo for the 24 hour treatment. Each test extract and the negative control were tested in duplicate.

Result: The RPMIo and DMSO test article extracts did not cause a two-fold or greater increase in the mean mutant frequency of the L5178Y/TK* cell line either in the presence or absence of metabolic activation. The test article was not mutagenic.

Mouse Peripheral Blood Micronucleus Study

Purpose: To evaluate the potential for a test article extract to cause damage to chromosomes or the mitotic apparatus of murine erythroblasts by measuring the frequency of micronucleated reticulocytes (MN-RETs) in mice. Erythroblasts are erythrocyte precursor cells in the bone marrow.

Method: The test article was soaked in a sufficient volume (90 mL) of 0.9% sodium chloride (SC) to fully cover and submerge the sample. The test article was soaked for 10 minutes. The test article was removed from the saline, weighed, placed in a tightly capped vial, and delivered to the laboratory for immediate extraction. Twenty two or twenty three test articles were used for each extraction. The test article was subjected to the following extraction conditions: 50℃ for 72 hours. The extracts were

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Image /page/9/Picture/0 description: The image contains the logo for MEDOVENT GmbH. The logo is in bold, black font, with the "O" in MEDOVENT represented by a golden circle. Below the company name is the tagline "Implants that care" in a smaller, gray font.

mail@medovent.com

510(k) Summary

(as required by 21 CFR 807.92)

continuously agitated during extraction. Fresh extracts were prepared for each day of dosing.

For three consecutive days, twelve mice per test article extract (six per sex) were injected intraperitoneally with the test article extracts. Similarly, six animals per sex were dosed with either the appropriate vehicle as the negative control or methyl methanesulfonate as a positive control. All animals were observed immediately following dosing and daily for assessment of general health. On day 4, blood was collected from the tail veins and reticulocytes were evaluated for the presence of micronuclei by flow cytometry.

Result: The test article extracts did not induce micronuclei in mice.

Long term implantation of Reaxon® Plus

Purpose: To evaluate the long term stability and tolerance of the implanted Reaxon® Plus.

Method: Reaxon® Plus was implanted in Wistar rats in a 10 mm rat sciatic nerve defect. After different implantation times (12, 24, 50 and 74/77 weeks) Reaxon® Nerve Guide was explanted and properties of the tubes, the connective tissue as well as the nerve cable analyzed to evaluate tissue reactions and the stability of the implanted nerve guide.

Results: The study demonstrated a slow degradation process and very mild tissue response after implantation of Reaxon® Plus. The analysis revealed a low number of activated macrophages at the implantation site of Reaxon® Plus showing low degradation activity in the chitosan tubes with good stability and only marginal signs of degradation until 50 weeks and first significant macroscopic signs of degradation at time point 74/77 weeks. The biological tissue response to Reaxon® Plus was found to be stable already at 3 months post-implantation, confirmed by the small and further decreasing number of macrophages and thickness of the fibrotic layer at the site of implantation which are indicators for a very mild tissue response.

Based on the results presented above we conclude that Reaxon® Plus has a similar safety as its predicate device NeuraGen® Nerve Guide.

Performance Characteristics

The mechanical and physical characteristics (bench tests) of Reaxon® Plus were evaluated in a series of tests. These tests were conducted to ensure that Reaxon® Plus possess the mechanical properties (suture retention and mechanical compression) as well as physical properties required for use in the human body. Testing has

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Image /page/10/Picture/0 description: The image contains the logo for MEDOVENT GmbH. The logo features the company name in bold, black letters, with the "O" in "MEDOVENT" represented by a golden circle. Below the company name is the tagline "Implants that care" in a smaller, gray font.

Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany
Tel. +496131-61769-0, Fax +496131-6176929
mail@medovent.com

510(k) Summary

Page 8 of 9

(as required by 21 CFR 807.92)

demonstrated that the nerve guide is able to hold a suture and resist repeated compression from surrounding tissues.

These tests were done in direct comparison between Reaxon® Plus and its predicate device NeuraGen® Nerve Guide.

Dimensional / visual inspection

Purpose: To evaluate the influence of ethylene oxide sterilization on the dimensions of Reaxon® Plus.

Method: Direct measurement of the dimensions of the tubes before and after sterilization.

Result: Dimensional analysis was completed to verify that the dimensions of the Reaxon® Plus were within specified tolerances following ethylene oxide sterilization.

Suture retention strength test

Purpose: To evaluate the suture retention strength of the Reaxon® Plus.

Method: After 24 hours in PBS (pH 7.4) at RT, the tubes were incubated for 1 hour at 37°C for the measurement of suture retention. One extremity of the tube was clamped at the lower clamp of the mechanical tester. A suture thread (USP 6/0 Prolene) was used to pierce the tube at 2 mm from the top extremity (in both sides of the extremity). The suture was clamped at the top clamp of the mechanical tester. The force required to pull out the thread at constant cross-head speed at 1mm/min was monitored.

Result: Suture retention strength testing was completed to verify that Reaxon® Plus has sufficient strength to resist suture pull-out under loads exceeding those anticipated in the intended use environment.

Compression and Rebound analysis

Purpose: To evaluate the compression and rebound properties of Reaxon® Plus.

Method: A transverse compression test was performed. After incubating the tubes for 1 h at 37°C, 1 cm of each tube was tested. A displacement perpendicular to the longitudinal axis of the conduit was applied at a crosshead speed of 1 mm/min to a final displacement of approximately 60 % of the diameter of the conduits. The force "F" versus displacement "d" is recorded.

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Friedrich-Koenig-Str. 3, D-55129 Mainz - Germany

Tel. +496131-61769-0, Fax +496131-6176929

mail@medovent.com

510(k) Summary

(as required by 21 CFR 807.92)

Result: Compression and rebound analysis was completed to verify that the Reaxon® Plus can withstand compressive forces greater than 0.25 N and it will re-open following removal of compressive forces sufficient to collapse the nerve guide.

K. Conclusion:

Reaxon® Plus is intended for use in repair of peripheral nerve discontinuities up to 10mm and where gap closure can be achieved by flexion of the extremity.

Reaxon® Plus is flexible to accommodate movement of joint while retaining its shape and it is resistant to occlusive forces from surrounding tissue.

Reaxon® Plus has sufficient strength to resist suture pull-out under loads exceeding those anticipated in the intended use environment.

Biocompatibility studies have demonstrated Reaxon® Plus to be non-cytotoxic, nonsensitizing, non-toxic, non-pyrogenic and non-genotoxic.

Based on the results of animal studies, in vitro product characterization studies, and in vitro and in vivo biocompatibility studies, we conclude that Reaxon® Plus has a similar safety and effectiveness profile as its predicate device NeuraGen® Nerve Guide.

Regulation Number and Section

§ 882.5275 Nerve cuff.

(a)
Identification. A nerve cuff is a tubular silicone rubber sheath used to encase a nerve for aid in repairing the nerve (e.g., to prevent ingrowth of scar tissue) and for capping the end of the nerve to prevent the formation of neuroma (tumors).(b)
Classification. Class II (performance standards).