Medusa Orthopedics Boa External Fixation System

K252555 · Medusa Orthopedics, LLC · KTT · Nov 25, 2025 · Orthopedic

Device Facts

• Record ID: K252555
• Device Name: Medusa Orthopedics Boa External Fixation System
• Applicant: Medusa Orthopedics, LLC
• Product Code: KTT · Orthopedic
• Decision Date: Nov 25, 2025
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 888.3030
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

The Medusa Orthopedics Boa External Fixation System and its components are indicated for open and closed fracture fixation, pseudoarthrosis or nonunions of long bones, limb lengthening by epiphyseal or metaphyseal distraction, correction of bony or soft tissue deformities, and correction of segmental or nonsegmental bony or soft tissue defects. The Medusa Orthopedics Boa External Fixation System is for use on all long bones including: tibia, fibula, femur, humerus, radius and ulna.

Device Story

Ring fixator system for stabilization and alignment of bone fractures, soft tissue, and congenital extremity deformities; consists of two rings connected by four independently adjustable struts; surgeon adjusts strut length to guide bone orientation and position via osteogenesis; used in clinical settings by orthopedic surgeons; provides stable fixation; benefits patient by enabling controlled bone correction and healing.

Clinical Evidence

Bench testing only. Fatigue axial load testing performed in accordance with ASTM F1541-17 Annex 7. Subject device achieved 1,000,000 cycles at 1975N, compared to the predicate's 1350N.

Technological Characteristics

Ring fixator system; materials include 6061 Aluminum, 7075 Aluminum, 316LVM Stainless Steel, 17-4 Stainless Steel, and PEEK. Components: rings (140-200mm), struts, half pins (4-6mm), wires (2.0mm), and connectors. Mechanical assembly; non-MRI compatible; reusable instruments require end-user sterilization; single-use bridge/anchor/connector elements.

Indications for Use

Indicated for patients requiring open/closed fracture fixation, pseudoarthrosis/nonunions of long bones (tibia, fibula, femur, humerus, radius, ulna), limb lengthening via distraction, or correction of bony/soft tissue deformities and defects.

Regulatory Classification

Identification

Single/multiple component metallic bone fixation appliances and accessories are devices intended to be implanted consisting of one or more metallic components and their metallic fasteners. The devices contain a plate, a nail/plate combination, or a blade/plate combination that are made of alloys, such as cobalt-chromium-molybdenum, stainless steel, and titanium, that are intended to be held in position with fasteners, such as screws and nails, or bolts, nuts, and washers. These devices are used for fixation of fractures of the proximal or distal end of long bones, such as intracapsular, intertrochanteric, intercervical, supracondylar, or condylar fractures of the femur; for fusion of a joint; or for surgical procedures that involve cutting a bone. The devices may be implanted or attached through the skin so that a pulling force (traction) may be applied to the skeletal system.

Predicate Devices

• DNE External Fixation System (K113106)

Submission Summary (Full Text)

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FDA U.S. FOOD & DRUG ADMINISTRATION

November 25, 2025

Medusa Orthopedics, LLC
Penny Rasmussen
Consultant
8500 Belcher Road N
Apt. 807
Pinellas Park, Florida 33781

Re: K252555
Trade/Device Name: Medusa Orthopedics Boa External Fixation System
Regulation Number: 21 CFR 888.3030
Regulation Name: Single/multiple component metallic bone fixation appliances and accessories
Regulatory Class: Class II
Product Code: KTT
Dated: October 28, 2025
Received: October 28, 2025

Dear Penny Rasmussen:

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 (the 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. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database available at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. 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.

U.S. Food & Drug Administration
10903 New Hampshire Avenue
Silver Spring, MD 20993
www.fda.gov

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Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device" (https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).

Your device is also subject to, among other requirements, the Quality System (QS) regulation (21 CFR Part 820), which includes, but is not limited to, 21 CFR 820.30, Design controls; 21 CFR 820.90, Nonconforming product; and 21 CFR 820.100, Corrective and preventive action. Please note that regardless of whether a change requires premarket review, the QS regulation requires device manufacturers to review and approve changes to device design and production (21 CFR 820.30 and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).

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 device-related adverse events) (21 CFR Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reporting-combination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.

All medical devices, including Class I and unclassified devices and combination product device constituent parts are required to be in compliance with the final Unique Device Identification System rule ("UDI Rule"). The UDI Rule requires, among other things, that a device bear a unique device identifier (UDI) on its label and package (21 CFR 801.20(a)) unless an exception or alternative applies (21 CFR 801.20(b)) and that the dates on the device label be formatted in accordance with 21 CFR 801.18. The UDI Rule (21 CFR 830.300(a) and 830.320(b)) also requires that certain information be submitted to the Global Unique Device Identification Database (GUDID) (21 CFR Part 830 Subpart E). For additional information on these requirements, please see the UDI System webpage at https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance/unique-device-identification-system-udi-system.

Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-devices/medical-device-safety/medical-device-reporting-mdr-how-report-medical-device-problems.

For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-

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assistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email ([e-mail]) or phone [phone] or 301-796-7100).

Sincerely,

## Lixin Liu -S

Lixin Liu, Ph.D
Assistant Director
DHT6A: Division of Joint Arthroplasty Devices
OHT6: Office of Orthopedic Devices
Office of Product Evaluation and Quality
Center for Devices and Radiological Health

Enclosure

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DEPARTMENT OF HEALTH AND HUMAN SERVICES
Food and Drug Administration
Indications for Use
Form Approved: OMB No. 0910-0120
Expiration Date: 07/31/2026
See PRA Statement below.

Submission Number (if known)
K252555

Device Name
Medusa Orthopedics Boa External Fixation System

Indications for Use (Describe)
The Medusa Orthopedics Boa External Fixation System and its components are indicated for open and closed fracture fixation, pseudoarthrosis or nonunions of long bones, limb lengthening by epiphyseal or metaphyseal distraction, correction of bony or soft tissue deformities, and correction of segmental or nonsegmental bony or soft tissue defects.

The Medusa Orthopedics Boa External Fixation System is for use on all long bones including: tibia, fibula, femur, humerus, radius and ulna.

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)

## CONTINUE ON A SEPARATE PAGE IF NEEDED.

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K252555 (Page 1 of 8)

Traditional 510(k) Medusa Orthopedics Boa External Fixation System

## 510(k) Summary
Medusa Orthopedics Boa External Fixation System

**Company:**
Medusa Orthopedics. LLC
1055 Cetronia Road
Unit #W4
Breinigsville, PA. 18031

**Company Contact:**
Nicholas (Nico) V. Riccione, President
1044 Cetronia Road
Unit #W4
Breinigsville, PA. 18031
[e-mail]

**Company/Secondary Contact:**
Penny Rasmussen
8500 Belcher Road N
Apt.807
Pinellas Park, FL 33781
[e-mail]
901-317-9752

**Trade Name:**
Medusa Orthopedics Boa External Fixation System

**Common Name:**
External Fixation Frame

**Classification:**
Class II

**Regulation Number:**
21 CFR 888.3030

**Panel:**
Orthopedic

**Product Code:**
KTT

## Device Description

The Medusa Orthopedics Boa External Fixation System is a ring fixator device used to stabilize and maintain alignment of complicated bone fractures, soft tissue and/or congenital deformity repairs of an extremity. The fixator consists of two rings connected by four (4) struts that are lengthened and shortened independently. It is a modular system and facilitates a multitude of frame configurations to provide a wide variety of patient needs. The independent motion of the struts allows the surgeon to adjust the position of the proximal and distal rings. By utilizing the body's natural ability of osteogenesis to grow new bone tissue, the system guides the orientation and position of the new bone to the desired corrected location in a steady controlled manner.

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

## Indications For Use/Intended Use

The Medusa Orthopedics Boa External Fixation System and its components are indicated for open and closed fracture fixation, pseudoarthrosis or nonunions of long bones, limb lengthening by epiphyseal or metaphyseal distraction, correction of bony or soft tissue deformities, and correction of segmental or nonsegmental bony or soft tissue defects. The Medusa Orthopedics Boa External Fixation System is for use on all long bones including tibia, fibula, femur, humerus, radius and ulna.

## Predicate

The Subject Medusa Orthopedics Boa External Fixation System components are substantially equivalent with respect to the materials, design and indications for use to the following device, previously cleared by the FDA:

### Predicate:

- DNE External Fixation System – K113106

## Technological Characteristics Comparison

The subject components for the Medusa Orthopedics Boa External Fixation System are substantially similar to the DNE External Fixation system (K113106).

The Medusa Orthopedics Boa External Fixation System is substantially equivalent to the predicate device in indications for use, design, operational principles and materials.

The proposed subject device has the same intended use and similar technological characteristics to the predicate. Any differences do not raise different questions of safety and effectiveness, and the proposed device is at least as safe and effective as the legally marketed predicate device. The Subject and Predicate devices are listed below in Table 1.

Table 1. Comparison of Subject and Predicate Device

| | Subject Device | Predicate Device | Comparison |
| --- | --- | --- | --- |
| Device | Medusa Orthopedics Boa External Fixation System | D.N.E. External Fixation System | |
| Manufacturer | Medusa Orthopedics, LLC | D.N.E., LLC. | |
| 510(k) Number | K252555 | K113106 | |

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

| FDA Product Code | KTT | KTT | Same |
| --- | --- | --- | --- |
| Regulatory Class | II | II | Same |
| Regulation Number | 888.3030 | 888.3030 | Same |
| Intended Use / Indications for Use | The Medusa Orthopedics Boa External Fixation System and its components are indicated for open and closed fracture fixation, pseudoarthrosis or nonunions of long bones, limb lengthening by epiphyseal or metaphyseal distraction, correction of bony or soft tissue deformities, and correction of segmental or nonsegmental bony or soft tissue defects.
The Medusa Orthopedics Boa External Fixation System is for use on all long bones including: tibia, fibula, femur, humerus, radius and ulna. | The D.N.E. External Fixation System and its components are indicated for open and closed fracture fixation, pseudoarthrosis or nonunions of long bones, limb lengthening by epiphyseal or metaphyseal distraction, correction of bony or soft tissue deformities, and correction of segmental or nonsegmental bony or soft tissue defects.
The D.N.E. External Fixation System is for use on all long bones including: tibia, fibula, femur, humerus, radius and ulna. | The patient population is the same for the intended use /indications for use.
The subject and predicate systems have the same intended use /indications for use.
No new or increased risks identified. |
| Anatomical Sites | Long bones including tibia, fibula, femur, humerus, radius and ulna. | Same | The anatomical sites are the same for the subject and predicate. |
| --- | --- | --- | --- |

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

| | | | No new or increased risks identified. |
| --- | --- | --- | --- |
| Material | Aluminum, Ti 6061 and Stainless Steel and PEEK. | Same | The materials in the subject system are the same as the predicate. The materials are commonly used in many orthopedic devices currently on the market. No new or increased risks identified. |
| Principle of Operation | The Medusa Orthopedics Boa External Fixation System consists of the following elements: (1) bridge elements (2) anchor elements (3) connector elements. The Medusa Orthopedics Boa External Fixation System design allows freedom of wire and pin placement, ease of assembly, stable fixation of bone | Same | Same. No new or increased risks identified. |
| MRI | The Medusa Orthopedics Boa External Fixation System has not been evaluated for safety and compatibility in the MRI environment. | Same | Same. No new or increased risks identified. |
| Single Use | Bridge, Anchor and Connector Elements are single use. | Same | Same. No new or increased risks identified. |

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

| Reusable | Instruments are reusable and End User Sterilized. | Same | The subject and the predicate instruments are common components for orthopedic procedures. The subject and predicate instruments are general and not unique to the system.
The instruments have the same requirements for cleaning and end user sterilization.
No new or increased risks are identified. |
| --- | --- | --- | --- |

Bridge elements, anchor elements, and connector elements for the Medusa Orthopedics Boa External Fixation System are the same or similar in dimensions and materials as the D.N.E. Predicate device. The Technological Characteristics Comparisons for the Bridge Elements are listed below in Table 2.

Table 2.

| Bridge Elements | | | |
| --- | --- | --- | --- |
| Name | Subject | Predicate | Comments |
| Rings | The Medusa Orthopedics Boa External Fixation System rings are 8 mm thick and are provided in the following diameters: 140 mm, 160 mm, 180 mm, and 200 mm. | D.N.E. rings are 8 mm thick and are provided in the following diameters: 140 mm, 160 mm, 180 mm, and 200 mm. | There are no dimensional or material differences between the ring components. |
| | The material used is 6061 Aluminum | The material used is 6061 Aluminum | |
| Struts | Struts are 0.5-inch in thickness and are offered in the following lengths: 35 mm, 50 mm, | Struts are 0.5-inch in thickness and are offered in the following lengths: 35 mm, | |

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

The Technological Characteristics Comparisons for the Anchor Elements are listed below in Table 3.

Table 3.
| Anchor Elements | | | |
| --- | --- | --- | --- |
| Name | Subject | Predicate | Comments |
| Pins | 4mm, 5mm and 6mm half pins. | 4mm, 5mm and 6mm half pins. | Medusa Orthopedics Boa External Fixation System and the predicate anchor elements are sourced from the same supplier. There are no differences between material or dimensions. |
| | Thread Length 45MM Total Length 180MM | Thread Length 45MM Total Length 180MM | |
| | 316LVM Stainless Steel | 316LVM Stainless Steel | |
| Wires | Wires are 2.0 mm in diameter and composed of 316L stainless steel. | Wires are 2.0 mm in diameter and composed of 316L stainless steel. | There are no differences between material or dimensions. |

The Technological Characteristics Comparisons for the Connector Elements are listed below in Table 4.

Table 4.
| Connector Elements | | | |
| --- | --- | --- | --- |
| Name | Subject | Predicate | Comments |
| Bolts- | Half Pin | Half Pin | The Subject and |
| Half Pin | 12mm,16mm,20mm and 25mm .500" diameter 17-4 SS | 12mm,16mm,20mm and 25mm .500" diameter 17-4 SS | Predicate wire and half-pin fixation bolts utilize the same M6 × 1 thread and are manufactured from 17-4 stainless steel, same as the predicate. |
| Wires | Wires | Wires | |
| | .920" Length .500" diameter. 17-4 SS | .920" Length .500" diameter. 17-4 SS | |

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

| Hex Nut – Lock Nut | Hex Nut – 10mm length, .390" diameter and 316 SS
Lock Nut – 10mm length, .390" diameter and 316 SS and nylon | Hex Nut – 10mm length, .390" diameter and 316 SS
Lock Nut – 10mm length, .390" diameter and 316 SS and nylon | The Subject and Predicate have the same dimensions and material. |
| --- | --- | --- | --- |
| Fang Clamp
Plates | 2 ¼" Length
¾" Height
Aluminum 7075, 17-4 SS
Plates 2 and 4 holes.
.500" diameter 17-4 SS | Plates 2 and 4 holes. .500" diameter 17-4 SS | Similar to the predicate. The Fang Clamp is used in the same manner as the predicate’s plates. A clamp or plates is used when a doctor wants to size down the rings. Normally a larger proximal ring and a smaller distal ring are used. (Heavier calf and smaller ankle).
Testing showed that the fang clamp was stronger than a plate. |
| Washers | Round Washer
Flat Washer
Slotted Washer
316 SS | Round Washer
Flat Washer
Slotted Washer
316SS | The Subject and Predicate are the same. |

The information provided within this section demonstrates that the proposed Medusa Orthopedics Boa External Fixation System has the same intended use and indications for use as the legally marketed predicate device. The Subject and Predicate systems are similar in technological characteristics such as materials, design and application. The systems both apply the same established surgical techniques for repair of fractures or deformities utilizing a ring fixation system.

In addition, the comparison provides justification that no different questions of safety and effectiveness have been raised due to any differences, and the proposed device is at least as safe and effective as the legally marketed predicate device.

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Traditional 510(k) Medusa Orthopedics Boa External Fixation System

## Performance Testing

Mechanical testing and engineering analysis were conducted on the Medusa Orthopedics Boa External Fixation System to demonstrate substantial equivalence to the Predicate system.

The objective of this test battery was to characterize the Medusa External Boa Fixation System mechanical properties in Fatigue Axial Load Testing in accordance with ASTM F1541-17 Annex 7 to estimate the maximum run out force value at 1 000 000 cycles.

The assembled constructs were rigidly mounted in the test frame using self-leveling spacer jacks placed around the device approximately 90° apart accompanied with toe clamps tightened directly over the spacer jacks. The self-leveling spacer jacks were used to prevent stress risers and keep the long-axis of the device aligned with the test frame actuator axis.

The fatigue testing was to simulate how an external fixation is loaded in real life through weight bearing and ambulation. The test demonstrates that the rigidity of the Subject device's entire construct does not differ from the Predicate's design. The Medusa Orthopedics Boa External Fixation System achieved 1,000,000 cycles at 1975N, whereas the Predicate's runout at 1,000,000 cycles achieved 1350N.

## Conclusion

The Medusa Orthopedics Boa External Fixation System is shown to be substantially equivalent to its Predicate, DNE External Fixation System. The subject device has similar intended uses, indications, technological characteristics, and principles of operation as the predicate device. The minor differences in indications do not alter the intended use of the device and do not affect its safety and effectiveness when used as labeled. In addition, performance data demonstrates no different questions of safety or effectiveness. Thus, Medusa Orthopedics Boa External Fixation System is substantially equivalent with the predicate.

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