Implantation Testing (ISO 10993-6)
Implantation studies are designed to assess the local response of living tissue to a medical device or biomaterial in direct contact with the implant site. Unlike systemic toxicity, which looks at the whole body, implantation testing focuses on the interface between the tissue and the device to identify signs of inflammation, infection, or tissue integration.
At EBI, all studies are conducted in strict accordance with ISO 10993-6, involving both macroscopic and microscopic (histopathological) analysis by certified experts.
Local Effects After Implantation
The biological response to an implanted material is a dynamic process. EBI provides detailed assessments of the tissue’s reaction over specified time intervals, ranging from short-term (acute) to long-term (chronic) exposure. Our studies help manufacturers determine the degree of fibrosis, inflammation, and the presence of specialized cell types such as giant cells or macrophages.
We offer three primary routes for implantation testing, depending on the intended clinical use of your device:
1. Subcutaneous Implantation
This is the most common route for evaluating the local tissue response to materials that will be placed under the skin or for initial screening of new biomaterials.
- Species: Typically conducted in rats (6 animals per study).
- Process: The test items and control materials are implanted into the subcutaneous tissue of the back.
- Evaluation: After the designated period, the implant site and surrounding tissue are excised for histopathological processing.
- Turnaround Time: Individually determined based on the study duration and Ethics Committee approval.
2. Muscle Implantation
Muscle implantation is used for devices that will have contact with muscle tissue or as a more sensitive alternative to subcutaneous testing for certain types of materials.
- Species: New Zealand White Rabbits.
- Procedure: Materials are implanted directly into the paravertebral muscles.
- Duration: Standard intervals are typically 4 weeks (short-term) or 13 weeks (long-term).
- Key Feature: Allows for a direct comparison between the test item and a legally marketed control material within the same animal.
- Turnaround Time: Individually determined based on the study duration and Ethics Committee approval.
3. Bone Implantation
Crucial for orthopedic, dental, and bone-grafting materials, this study evaluates the integration of the device with bone tissue (osteointegration) and the reaction of the bone marrow.
- Species: New Zealand White Rabbits.
- Procedure: The test items are implanted into the femur (distal, medial, or proximal locations).
- Analysis: Focuses on bone resorption, formation, and the presence of any adverse inflammatory responses within the cortical or trabecular bone.
- Turnaround Time: Minimum of 12 to 21 weeks, depending on the mineralization state of the samples and the duration of the study.
Histopathological Expertise
The most critical component of an ISO 10993-6 study is the final histopathological report. At EBI, our process includes:
- Macroscopic Observation: Macroscopic observation during gross necropsy of the tissue for signs of hemorrhage, necrosis, or encapsulation.
- Microscopic Evaluation: Detailed scoring of cell types (neutrophils, lymphocytes, plasma cells, macrophages, etc.).
- Comparative Scoring: Evaluation of the test item relative to a control material to determine the „Biological Reactivity Rating.”
Technical Study Overview
| Implantation Route | Primary Species | Common Intervals | Key Parameters |
|---|---|---|---|
| Subcutaneous | Rats | 1, 4, or 13 weeks | Fibrosis, inflammation, encapsulation |
| Muscle | Rabbits | 4 or 13 weeks | Local toxicity, muscle fiber degeneration |
| Bone | Rabbits | 4, 13, or 26+ weeks | Osteointegration, bone marrow response |
Sample Requirements
Due to the variety of shapes and sizes of medical devices, sample requirements for ISO 10993-6 are determined individually.
- Solid materials: Often required in the form of rods, discs, or the finished device itself.
- Degradable materials: May require additional time points to evaluate the degradation profile.
- Packaging: Samples must be provided in their final sterile packaging to ensure the results reflect clinical reality.
Regulatory Compliance and Ethics
EBI operates under the highest ethical standards. All in vivo implantation studies require:
- Ethics Committee Approval: We manage the submission to the Local Ethics Committee to ensure the study is justified.
- ISO 10993-12 Compliance: For sample preparation and selection of appropriate control materials.
- 3Rs Principle: We optimize study designs to use the minimum number of animals necessary to achieve statistically significant results.
How We Work
Discovery & Insight
We begin with an in-depth consultation to understand your needs, challenges, and objectives. This helps us define the right strategy and scientific approach for your project.
Design & Development
Our experts translate your vision into actionable plans — combining innovative research, data, and technology to build precise and reliable solutions.
Delivery & Support
We implement the solution with full transparency and ongoing communication. After delivery, we stay involved — supporting you with optimization, updates, and future improvements.
FAQ: Implantation Testing
How is the duration of the implantation study determined?
The duration depends on the intended clinical exposure of the device. For prolonged contact (>24h to 28 days), short-term implantation (1-4 weeks) is usually sufficient. For permanent implants, long-term studies (13 or 26 weeks) are required to assess steady-state tissue response.
What is a „Biological Reactivity Rating”?
This is a calculated score that compares the tissue reaction of your device to a known negative control. It categorizes the device’s reactivity as No reaction or Minimal, Mild, Moderate, or Severe.
Can you test non-solid materials, such as gels or bone cements?
Yes. ISO 10993-6 provides protocols for testing non-solid materials. In these cases, the materials are often injected or placed in specialized carriers to ensure they remain at the target site.
How is the duration of the implantation study determined?
The duration depends on the intended clinical exposure of the device. For prolonged contact (>24h to 28 days), short-term implantation (1-4 weeks) is usually sufficient. For permanent implants, long-term studies (13 or 26 weeks) are required to assess steady-state tissue response.
What is a "Biological Reactivity Rating"?
This is a calculated score that compares the tissue reaction of your device to a known negative control. It categorizes the device’s reactivity as No reaction or Minimal, Mild, Moderate, or Severe.
Can you test non-solid materials, such as gels or bone cements?
Yes. ISO 10993-6 provides protocols for testing non-solid materials. In these cases, the materials are often injected or placed in specialized carriers to ensure they remain at the target site.
Contact with us
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Location:
Europejski Instytut Biomedyczny sp. z o.o.
ul. Bartycka 63A lok. 6, 00-716 Warszawa
Mail:
contact@ebi.bio
Phone:
+48 22 780 06 32
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