ntegrating an intraoral scanner, combined with cutting-edge equipment, simplifies the manufacturing of prostheses and orthodontic devices, reduces delays, improves patient comfort and optimizes practitioner ergonomics.

Here you will discover how the advanced optical technologies integrated by PISÉO guarantee images of exceptional quality.

High-Resolution Imaging Sensor

After an in-depth study of their optical and electrical characteristics, PISÉO experts chose and integrated very small, high-resolution imaging sensors. To this end, the PISÉO imaging laboratory evaluated the performance of these advanced sensors by carrying out measurements of MTF 50 on the object side, SNR and distortion. The tests also made it possible to assess the deformations generated by the rolling-sutter of the sensors. The results of these evaluations were taken into account to size and develop the LED lighting, as well as the electronics and on-board software. These characterizations associated with the development work ultimately made it possible to produce images of unrivaled quality for the client’s application.

LED lighting

In order to be able to produce optimal quality images in the oral environment, an efficient lighting system is required. For this project, PISÉO engineers, specialized in LED lighting, therefore designed specific lighting which provides, in all circumstances, all the illumination, colorimetry and contrasts necessary for the image sensor. In addition, to overcome the problems of image distortion linked to the use of rolling-shutter CMOS sensors, LED control electronics have been designed specifically for this product.

Development of the Intraoral Scanner

PISÉO’s structured innovation process made it possible to resolve the technical challenges of the project, with risk analyzes and action plans.

Calculations, optical simulations, and models and prototypes were carried out to test the functions of the scanner before industrialization, paying particular attention to performance, waterproofing, “manufacturability”, and compliance with CE medical regulations.

The results of this project highlight the importance of a tailor-made approach in close collaboration with the Client. Opt for a personalized and efficient solution and trust the expertise of PISÉO and its valued partners for the development and manufacturing of your dental or medical devices.

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Finding a suitable lens

PISÉO experts used their global database of lens manufacturers to find off-the-shelf (COTS) components meeting the criteria of field of view, working distance, depth of field, and bulk. The final choice was made by comparing the expected image qualities (resolution, aberrations, chromatism) and Chief Ray Angle (CRA). This last characteristic is particularly critical for the performance of the sensor-lens pair.

Optical and mechanical engineering

Once the characteristics of the sensor and the lens had been defined, PISÉO proceeded with the development of the endoscope demonstrator. For this, PISÉO engineers mobilized their skills in optical and mechanical engineering. They also specified suitable LED lighting using optical fibers.

The extremely small dimensions of the system represented a significant challenge for the mechanical assembly of the optical components. It was necessary to define totally new solutions to ensure the very precise assembly of the whole.

Assembly and testing of the endoscope demonstrator

The specific mechanical components were manufactured by a trusted PISÉO partner. The assembly of the endoscope involved specialized bonding techniques and was carried out in the PISÉO laboratory. To ensure image quality, the performance of the endoscope was rigorously tested in the PISÉO optical imaging laboratory.

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Enhancement of the medical endoscope sensor

Despite an extremely tight schedule, PISÉO met the expectations of the Teledyne e2V marketing teams. 2 endoscopes were delivered on time to the client, who was able to use them at the COMPAMED Trade Fair in Dusseldorf in November 2023.

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This collaboration demonstrates the importance of a tailor-made approach to realize the most out of available optical components, ensuring optimal endoscope performance. Like Teledyne e2V, for personalized and efficient solutions in the field of medical imaging, you can trust PISÉO and its partners.

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However, it is often difficult to find commercial LED lights that meet the specific requirements of these diagnostic systems. This frequently leads to the custom design of lighting, particularly in the case of devices for diagnosing skin cancer by imaging.

Search for Optical and LED Solutions

PISÉO experts explored different original solutions by combining light sources and dedicated optical systems. Architectures were pre-sized, modeled, and their performances were simulated using LightTools software. In parallel, a search for LED components was carried out, evaluating several candidates according to various criteria.

optical design and prototype

Based on the results obtained in the previous phase, a detailed optical design was carried out, defining the optical surfaces and mechanical interfaces. Specific “freeform” lenses have been designed to optimize illumination. The optical system was modeled in LightTools and performance simulations performed. The prototype was then specified and its components assembled in the PISÉO laboratory. Subassemblies such as the LED card and optics were manufactured by trusted partners. A thermal study was also carried out by PISÉO to size the heatsink used to cool the LEDs.

Testing and validation of the medical lighting system

To guarantee quality, optical performance tests were carried out in the PISÉO photometry laboratory. Illuminances, uniformity and spectral distribution were verified using calibrated measuring equipment. The test report validated the design, paving the way for controlled industrialization.

Photobiological risk for medical devices

All lighting systems containing light sources must be assessed from the point of view of photobiological risk. Thanks to their expertise in optical risks, our engineers carried out this assessment in parallel with the design. They were thus able to guarantee the development of lighting that complied with regulations on medical devices.

This collaboration between PISÉO experts and the client illustrates the importance of a tailor-made approach to meet the specific needs of imaging skin cancer diagnostic systems, thus ensuring optimal performance.

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Test benches are essential tools for measuring the optical performance of medical devices such as illumination systems used particularly in medical applications, more specifically surgery.

After devising a light projector integrated into an endoscope-type surgical robot, the customer wanted to measure the relative illumination delivered by this projector during its manufacture. PISÉO designed and produced a dedicated optical measurement bench for this purpose.

To meet the customer’s needs, PISÉO designed the measurement bench  to manage the plurality of lighting profiles produced by the projector. The projector uses LED-type light sources that have various emission lobe angles, but also laser-type light sources whose beam is collimated. PISÉO therefore had to consider all the wavelengths between 400 nm and 850 nm emitted by these different light sources to design and build this test bench.

Specification and opto-mechanical design of the test bench

To meet the customer’s expectations, the PISÉO experts imagined an imaging system capable of reading the lighting profiles projected on a diffusing surface. The profiles measured in this way make it possible to verify in a simple and robust way, in production, that the light emission profiles of the projector comply with the characteristics expected of the projector once integrated. They then specified the architecture of the bench and its components including camera, lens, mechanical and electrical interfaces, then carried out the detailed design.

Validation of the test bench

Once the measurement bench was assembled, PISÉO engineers carried out a series of tests to check its performance.

First, they did geometric and radiometric calibrations. The verifications focused on the calculations of the illumination profiles produced by a diffuse light source and by a collimated light source, which were compared with the profiles measured by devices in the PISÉO laboratory. The difference observed was less than the precision required by the customer, so the measuring bench was validated.

At the end of these tests, PISÉO recorded the geometric and radiometric calibrations in the measuring bench. The engineers set up management by serial number to manage the different copies of the measuring bench. They also compiled a user manual, a manufacturing file and a technical report gathering all the results of the tests carried out on the bench to allow the customer to understand the device’s performance.

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Multiple innovations have largely contributed to the improvement of the endoscope. The camera associated with the endoscope has, in particular, seen numerous developments. A true product of technology, it has benefited from improvements made to mobile phone cameras in terms of size and image quality. More compact, with better image definition and fields of view of up to 170°, endoscopic cameras are particularly appreciated by surgeons. They provide access to additional areas of the patient’s body with less trauma and faster recovery times.

In order to offer patients and the medical profession less invasive and more efficient solutions, manufacturers of medical equipment face real challenges. They must not only find innovative solutions in miniaturization and improvement of image quality but also ensure that these solutions are reliable and manufacturable .

It is in this context that PISÉO , a center of innovation and expertise specializing in the integration of optical-photonic technologies, was entrusted with a project to develop an optical system for rigid endoscopes. This included the study of a set of very small lenses adapted to the characteristics of a new sensor and the specific needs of one of its customers while taking into account integration and manufacturability constraints.

Optical design of imaging systems for endoscope

The dual objectives of miniaturization of the optical system and performance is a real challenge in the design of the optical system of an endoscope. In this project, the design phase involved taking into account specific technical constraints such as the diameter of the endoscope and the lenses, the size of the image, and the resolution of the sensor (number of pixels, frequency, contrast, spectral response, …), as well as working distance and depth of field.

Obtaining a quality image results as much from an optical design adapted to the system’s envelope as from the integration of a sensor, the characteristics of which must be perfectly known (angle of acceptance of the rays, resolution, etc.). The specifications required consideration of the integration of the optical part in two endoscope channels placed in parallel, with sensors arranged side-by-side or back-to-back using prism systems. It was, therefore, necessary to take into account not only the optical quality of the cameras but also the adaptation of the two channels and the size constraints of the final system. The optimization of the design and performance of the system was carried out through simulations using the optical design software ZEMAX.

The endoscope’s lighting system is stronger. It must be adapted to the area studied and as integrated as possible. The light must be white and bright, optimal for distinguishing the most subtle tissue lesions, for example. It may also be necessary for the system to produce wavelengths close to infrared to detect fluorescent markers, in particular facilitating the diagnosis of cancerous or pre-cancerous lesions. PISÉO ‘s expertise in the field of LED technology and its applications provided access to solutions that are particularly optimized in terms of the light spectrum and lighting levels.

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With their experience in creating optical illumination systems using LEDs or laser diodes (UV, VIS, IR) and the high-level technical means at their disposal, PISEO experts support you in developing systems optimized formedical and paramedical applications.

What is phototherapy

Phototherapy, unlike light therapy, is a treatment that uses visible and non-visible optical radiation from light (UVA, UVB, near infrared) to produce effects on human tissue.Its applications are numerous: cancer treatment, psoriasis, eczema, infant jaundice, ophthalmology … The light sources used for these treatments can be of the laser, laser diode or LED type.

Within the framework of this project, we worked on a product intended to accelerate the cicatrization of the skin thanks to a targeted optical radiation in visible and near infrared and functioning autonomously by use of a battery.In particular, we have optimized the optical coupling between the LEDs and the light guide to significantly improve the radiation on the skin and the autonomy of the device.

To carry out a critical analysis of the construction of the system, quantify and improve energy efficiency and radiation effect by optimizing the integration of the LED light sources.

Performed services

• Critical analysis of the existing system (performance, construction, LED components).
• Integration of product architecture in ZEMAX OpticStudio and simulation of optical performance.
• Consolidation of performance objectives (spectral distribution and irradiation level) to be achieved in relation to physiological needs.
• Optical System Redesign by use of ZEMAX OpticStudio: System Efficiency multiplied by 3 as a result.
• Support for the realization of the prototype.
• Characterization of optical performances in PISEO’s photometric test lab (irradiance, spectral power distribution, energy) by means of a large spectral band Instrument Systems spectroradiometer CAS 140D (300nm-1100nm)

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Performed services

• Definition of application requirements (energy levels, uniformity, cost)
• Component scouting LED UV (Viosys, Vishay, LG, Luminous, Rayvio…) and selection of appropriate LEDs.
• Design of the illuminator board (type and # UVA and UVC LEDs, electrical and thermal functional points , PCB type of PCB, driver…).
• Prototype realization.
• Photobiological risk assessment.

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