PFSB/ELD/OMDE/CMS (Yakushokukisan) Notification 0925 No.1
September 25, 2015

Attn: Directors of Prefectural Public Health Departments/BureauxCounsellor of Minister’s Secretariat(for Medical Device and Regenerative Medicine Product Evaluation),
Ministry of Health, Labour and Welfare(official seal omitted)

Publication of Guidance for the Evaluation of Emerging Technology
Medical Devices/Regenerative Medical Products

The Ministry of Health, Labour and Welfare of Japan has sought to establish guidance
for the evaluation of selected emerging technology medical devices/regenerative medical
products for which there is a high demand in clinical practice, to facilitate efficient
product development and speed up the approval process of them through the advance
preparation and publication of documents, instructing technical standards used for thereview.
Here, we present guidance comprising the documents that may be required for theevaluation of nasal cartilage regeneration (Attachment 1), cardiac catheter ablationequipment (Attachment 2), and custom-made orthopedic implants (Attachment 3), andthe advice for evaluation. We would like your cooperation in promulgating these
documents among the relevant vendors and service providers under your jurisdiction foruse as a reference when filing an application for manufacturing/marketing approval.
Attention should be paid to the following points.
(For your reference, copies of this notification will also be sent to the Chief Executiveof the Pharmaceutical and Medical Devices Agency, Chairman of the Japan Federationof Medical Devices Associations, Chairman of the American Medical Devices andDiagnostics Manufacturers’ Association, the Chairman of the Medical Equipment
Committee of the Council of the European Business Community in Japan, and otherrelated associations.)

1.

The guidance makes recommendations regarding points that should be consideredin product evaluation (evaluation items) from the viewpoints of collecting
application documents for approval and accelerating the review process. The

2.

guidance is not positioned as a legal standard but are designed to suggest currently
recognized evaluation items for the emerging technology medical
devices/regenerative medical products. It has to be noted that other kinds ofevaluation may be needed, or there may be some exceptions to this guidance
depending on the product’s characteristics.
When collecting documents and data required for submission of an application for
approval of individual products, it is recommended that the issues presented in theguidance be discussed in advance, and to use of consultation service of thePharmaceutical and Medical Devices Agency (PMDA) at the earliest possible
opportunity.

(Attachment 3)
Guidance for Evaluation of Three-dimensional Additive Manufacturing
Technology-Based, Custom-made Orthopedic Implants Produced from Patients’
Image Data
1. Introduction
The Statistics Bureau of the Ministry of Internal Affairs and Communications (MIC)
issued a report on trends in the elderly in Japan on September 15, 2014, and describedthat the population of the elderly (65 years or older) has reached 32.94 million and thisaccounts for 25.9% of the total population (Statistical Topics No.84, Statistics Bureau,
MIC). Aging in Japan is predicted to continue to accelerate. In this situation, cases ofmotor impairments (osteoarthritis, or femoral neck fracture or spinal compression fractureassociated with osteoporosis) in Japan are monotonically increasing, and it has beenurgently needed to facilitate sophisticated orthopedic implants such as those for a bone ora joint, including prostheses and osteosynthetic materials used for the treatment ofarthropathy, fractures, or orthomorphia, and improve the treatment techniques.
Conventional orthopedic implants have been proved safe and effective, been shown tobe durable for 10 to 20 years after implantation, and contributed to the orthopedic
treatment and extension of healthy life expectancy. Current issues of implants, however,include the existence of incompatibilities to the bone due to mismatched geometry
because conventional implants are supplied in uniform sizes based on a design determinedby average bone geometries. Thus, after a long period has passed after implantation,
patients can experience complications such as a fracture, a loosened prosthesis, or abreakage, resulting in reimplantation. In addition, reconstruction with an existing implantcan be infeasible in some cases when the bone deficit is a result of wide excision of bonetumor or when reimplanting. With this background, to make advancement toward the goalof further extending the healthy life expectancy of the Japanese public and improving thequality of life, development of very-long-life implants with a durability of 30 years or
longer is desired. As an approach to achieve this, customization of implants’ geometry
has been proposed.
Recently, development of several innovative technologies has made it possible toproduce custom-made orthopedic implants in small lots (single production) and in a shortperiod of time using three-dimensional additive manufacturing technologies such as
electron beam additive manufacturing, laser additive manufacturing, or inkjet printermanufacturing. This necessitates establishment of new standards for review toappropriately and promptly evaluate the safety and efficacy of osteoarticular implants andassociated operation-assisting guides that are produced with 3D additive manufacturing.
While considerations for the evaluation of the safety and efficacy of orthopedic implants
produced through 3D additive manufacturing were included in September 2014 in a
Notification, titled Guidance on Evaluation of Orthopedic Implants Produced With Three-Dimensional Additive Manufacturing (PFSB/ELD/OMDE/CMS Notification 0912 No. 2
issued by the Counsellor of Minister’s Secretariat [for Medical Device and Regenerative
Medicine Product Evaluation], MHLW, dated September 12, 2014, Attachment 3;
hereinafter, referred to as the Counsellor Notification), in the present guidanceconsiderations required when a 3D bone geometry is reproduced from an individual
patient’s image data in producing a customized implant using a 3D additive
manufacturing technique are included.
2. Scope
This guidance covers 3D additive manufacturing technology-based, custom-madeorthopedic implants and associated operation-assisting guides (hereinafter, referred to as
custom-made orthopedic implants including the guides) made for the purpose of
improving the biocompatibility and/or fixation for particular individual patients bygeometrically modifying a base ready-made product so that the implant matches the bonegeometry of the individual patient. This guidance shows considerations for the design
aimed to reproduce a 3D model of a bone or a cartilage-containing joint using eachindividual patient’s image data.
Note that even if the intended custom-made orthopedic implants are to be produced
through a process other than 3D additive manufacturing, such as a cutting process, thisguidance may still be used as a reference if the production is done by using a 3D modelreconstructed from the patient’s image data.
3. Role of This Guidance
In recent years, thanks to 3D additive manufacturing, of which potential applications to
the production of medical devices have increasingly drawn attention, it has become
possible to produce medical devices with a complex geometry even in small lots and in awide variety of kinds; given this background, this guidance shows possible issues orpoints that may arise or should be evaluated or considered when designing and producing
custom-made orthopedic implants in a way that matches the osseous/cartilaginous
geometry of the individual patient using image data of the bone specific to the patient. As
a guidance covering an area experiencing significant technological innovations, it is not
to provide a comprehensive list of issues and considerations but to indicate currently
conceivable points. This guidance will therefore be revised as technological innovations
are made and knowledge accumulates, and it is not to restrict, e.g., the contents ofregulatory submission. Prior consultation with the Pharmaceuticals and Medical Devices
Agency (PMDA) is recommended when a regulatory submission is planned for a novel
technology that offers a function that may not be included in those assumed in thisguidance.
In evaluating custom-made orthopedic implants produced using a 3D additive
manufacturing technique or another, it is required to have a thorough understanding of
the individual production processes and the characteristics of individual products andwith this understanding, to handle the data in a flexible and scientifically rational manner.
It is also necessary to consult other relevant, currently available guidelines from Japanand overseas in addition to this guidance. It should therefore be noted that whether thecharacteristics of the individual product can be evaluated using available
guidance/guidelines or not should be thoroughly considered. For the evaluation oforthopedic implants produced using 3D additive manufacturing, the Counsellor
Notification should also be consulted; for the evaluation of custom-made orthopedic
implants, the following guidance should also be consulted:● Publication of Guidance for the Evaluation of Emerging Technology Medical
Devices (PFSB/ELD/OMDE Notification 1215 No.1 dated December 15, 2010),
Attachment 3 “Guidance on Evaluation of Custom-made Orthopedic Devices for
Osteosynthesis”● Publication of Guidance for the Evaluation of Emerging Technology Medical
Devices (PFSB/ELD/OMDE Notification 1207 No.1 dated December 7, 2011),
Attachment 2 “Guidance on Evaluation of Orthopedic Custom-made Artificial Hip
Joint Prosthesis”● Publication of Guidance for the Evaluation of Emerging Technology Medical
Devices (PFSB/ELD/OMDE/CMS Notification 1120 No.5 dated November 20,2012), Attachment 1 “Guidance on Evaluation of Orthopedic Custom-made
Artificial Knee Joint Prosthesis”
4. Considerations in Reproducing 3D Bone Model from Patients’ Image Data
(1) Acquisition of Image Data from Patients
In designing a custom-made orthopedic implant, it is, in principle, essential toobtain image data using an appropriate image modality such as computed
tomography (CT) or magnetic resonance imaging (MRI), and reconstructgeometrical data of the bone or the cartilage-containing joint of the patient, inorder to make necessary geometrical modifications to a base ready-made productin a way that the implant matches the geometry of the bone or cartilage-containing
joint of the individual patient. CT-based image extraction is the most common
practice at present, but regardless of the modality used, the data reconstruction
requires:● Optimization of the imaging conditions, and● Optimization of the image extraction and processing.
Presented below are general considerations.
1) Imaging and image construction conditions
In considering the balance between the exposure risk of the patient and thenecessity of taking quality images adequate for the data reconstruction,
imaging parameters listed below should be investigated to determine
recommended conditions for them. The recommended conditions should bedetermined on the basis of relevant performance tests. If some parameters areexcluded from the determination, its justification should be presented. The dateof taking images of the affected region should be specified.
A) For CT:
l Imaging equipmentl Voltage of X-ray tubel Current of X-ray tube
l Scan slice thickness
l Beam pitchl Scanning timel Scan field of view (SFOV)l Reconstruction slice thickness
l Reconstruction slice incrementl Reconstruction functionl Measures against artifactsB) For MRI:l Imaging equipmentl Coill Presence of absence of sequence fat suppression, and if present, its kindl Scan section’s echo time and repetition time (and if it exits, inversiontime)l Flip angle (for gradient echo)l Scan slice thickness
l Field of view (FOV)l Number of excitationsl Band widthl Sense factor or an analogous parameterl Imaging timel Reconstruction slice thickness
l Reconstruction slice incrementl Reconstruction directionl Measures against artifacts2) Image expiration
Although no specific restrictions exist for the timing of the 3D imaging, theimages taken should not be used if the physician judges that the anatomical
structure of the affected region may have changed, considering thecharacteristics of the concerned medical condition.
3) Effects of artifacts
If a foreign substance such as a metallic implant is seen in the image acquired,
there may be concern that the substance might cause an increase in the CT levelof the surrounding area, a filling defect, or another artifact, even if possible
measures are taken at the time of imaging. The possibility that these artifacts

affect the precision of the reconstructed 3D model cannot be ruled out. If such
image data need to be used, an appropriate action should be considered for it,
such as evaluating the effect of the artifact with an appropriate method or
stating clearly that the effect has not been evaluated and confirming that thephysician determines that the geometry of the product meets the productspecifications.
(2) Image Extraction and 3D Model Reconstruction
For the image extraction and 3D model reconstruction, the precision of the 3Dmodel data should be clearly determined and presented.
Regardless of what kind of program is used to construct 3D model data from CT
or other image data, the following points should be considered:
1) Handling of image data
If one intend to do image extraction and 3D model reconstruction on therequest of a medical institution, one should establish appropriate measures toprevent leakage of personal information. (A consideration at the time ofcontract)
2) Method for extraction of 3D model data and determination of geometry
Requirements include:● To enumerate the processes for the data extraction and the geometricaldetermination in detail and clearly indicate the responsible person for andthe content of each process.
● To identify the program used to construct 3D model data.
● To evaluate the precision of the program again, if a modification of analgorithm or a change of the program itself that may affect the precision of
the 3D model data occurs.
● To justify the method used for the 3D model segmentation (e.g., byexplaining how to guarantee the skill of the operator, or for an automatic
segmentation, by describing its precision and appropriateness).
● To show the precision of the process of the conversion to a geometricalshape. (Clarification of the condition required to guarantee the precision)3) Acceptance criteria for the precision of the clinically needed 3D model data
Appropriate and adequate acceptance criteria for the precision of the 3Dmodel data should be determined for each of the intended body regions towhich the product is applied and for each of the intended purposes. The
rationale for the criteria determined should be explained as scientifically as
possible because it is expected that the performance desired for a medical
device can vary depending on the body region.
(3) Design
Currently, some kinds of three-dimensional computer aided design (3D-CAD)
programs have been used to design custom-made orthopedic implants. In

designing a custom-made orthopedic implant, the physician who requests the
product is responsible for a significant part, but the MAH should also consider thefollowing points:
1) Basic principle on the design(For example, that the design is achieved by customizing only the surface ofthe bone-implant interface using a basic design based on the base ready-madeproduct’s image data, or that the design is made as an optimized design
achieved by making a customization after making a change(s) in an importantfunctional part, e.g., the geometry of the sliding surface of a joint.)
2) When using the basic design approach, the manufacturing conditions based on
the basic design used, how to evaluate the final product (the customized part)on the basis of relevant test results including those for mechanical safety andbiological safety, the appropriateness of this evaluation method, and themethod of validating the relevant conditions
3) When making a suitable design for each patient, what effects there are on therelevant factors such as the manufacturing conditions, mechanical safety, andbiological safety as a result of the customization from a basic design, and how
the non-inferiority to the basic design is evaluated
4) Conversion to manufacturing data
● Method of converting data to the Standard Triangulated Language (STL)
file format (Appropriateness of the method selection)● Presence or absence of geometry confirmation by means of visual inspection[Its necessity; if necessary, its method (e.g., superposition with a relevant
CT image); and the appropriateness of the method](4) Examination of Final Geometry and Structure
To prove that custom-made orthopedic implants produced coincide with theirdesign geometry within a certain error range, final products should be used toconfirm the geometrical precision; the manufacturer should indicate the tolerance
range and the appropriateness of the validation method for it in advance.
For the precision test, it is recommended to use a measuring method that allows
three-dimensional measuring. For some products, one-dimensional measuring
may be applicable depending on their shape, provided that its adequacy is shown.
For surface roughness or a complex shape such as a porous structure, anappropriate method suitable for the structure should be used to individually test
them, and therefore not only test results but the principle of the testing method,
and the rationale and appropriateness of its use should be shown.
(5) Information That Should be Disclosed to Physician
The manufacturers of custom-made orthopedic implants are required to haveestablished a procedure to disclose the following design-related information in
response to a request from the physician who requested production of a custommade implant. Additional disclosure may be required, as necessary.

1) The 3D image of the affected region and the final geometry of the designed
custom-made orthopedic implant (for confirmation purpose)
2) The precision of the 3D image (errors and their possible causes: Bone density,
cartilage, cartilage defect, etc.)
3) Details of image processing4) The precision guaranteed for the designed and produced, final product or test
results for it (e.g., cadaver study)5) Recommended or tested imaging conditions