Preparation of Porous Anastomotic Nail Bioactive Coating

Research on the Application of Ultrasonic Spraying Technology in Preparing Bioactive Coatings for Porous Anastomotic Staples

Porous anastomotic staples serve as core implant devices for surgical anastomosis procedures. Benefiting from favorable tissue conformability and mechanical matching derived from their porous architecture, they are widely adopted for anastomosis and repair of soft tissues and bone tissues. Nevertheless, conventional staples made of metals or polymers feature inherent biological inertness. After implantation into the human body, they tend to trigger poor tissue attachment, delayed healing, mild foreign body reactions and long-term implant loosening. Surface modification via bioactive coating deposition can endow staples with critical properties including biocompatibility, healing acceleration and antibacterial capacity. Featuring distinctive merits of precise atomization and homogeneous deposition, ultrasonic spraying has emerged as one of the optimal manufacturing processes for functional coatings on porous staples, addressing multiple drawbacks inherent to conventional coating techniques.

Traditional staple coating fabrication predominantly relies on dipping, electrostatic spraying and high-temperature thermal spraying, which commonly suffer from uneven coating thickness, pore occlusion, low raw material utilization and substrate thermal deterioration. The micro-pored and irregular curved geometry of porous staples imposes stringent requirements on the precision and controllability of coating processes. Conventional methods frequently block staple micropores and impair the native air permeability and mechanical conformability of substrates; meanwhile, resultant coatings exhibit weak adhesion and high peeling tendency, failing to satisfy long-term clinical service requirements. Based on high-frequency ultrasonic atomization mechanism, ultrasonic spraying converts bioactive slurries into uniformly sized micron-scale droplets that deposit onto staple surfaces in a non-contact manner. It perfectly accommodates coating demands for porous and irregular configurations and eliminates core limitations of traditional processes.

Ultrasonic spraying is compatible with a wide spectrum of medical bioactive coating materials, such as hydroxyapatite, silicate bioceramics, collagen and antibacterial biological agents, all of which can form intact films stably with this technique. Bioceramic coatings mimic the inorganic composition of human bone to facilitate adhesion, proliferation and differentiation of osteoblasts, promoting biological osseointegration between staples and surrounding bone tissue. This transforms pure mechanical fixation into biological bonding and drastically cuts the risk of long-term implant loosening. Bioactive protein coatings like collagen improve interfacial biocompatibility with soft tissues, alleviate postoperative inflammation and tissue adhesion and accelerate wound regeneration. Composite antibacterial coatings enable sustained long-term antibacterial release to effectively prevent postoperative wound infection.

During coating operation, ultrasonic spraying equipment enables accurate regulation of ultrasonic frequency, atomization feed rate, spraying distance and moving path, achieving precise coating thickness control ranging from nanometers to micrometers with coating uniformity exceeding 95%. For the microporous structure of porous staples, fine droplets penetrate evenly into internal pores to form continuous, compact and thin bioactive coatings covering both exterior and interior surfaces. Such coatings avoid pore blockage and deterioration of the substrate’s original mechanical and breathable properties while maintaining robust bonding with staple substrates to resist delamination. In addition, the whole process proceeds at low temperature without thermal damage, fully preserving the bioactivity of raw biomaterials and stabilizing coating functional performance.

In terms of clinical value, porous staples surface-modified by ultrasonic spraying overcome the biological inertness of traditional implants. After implantation, optimized staples rapidly establish favorable biological interactions with host tissues, shorten wound healing cycles and reduce the incidence of postoperative complications including rejection, infection and loosening. Furthermore, the process boasts high material utilization, low raw material waste, excellent repeatability and operational stability, suitable for large-scale standardized manufacturing while balancing the safety, functionality and cost-effectiveness of medical devices.

In conclusion, with core strengths of precise controllability, non-destructive substrate treatment, broad material compatibility and superior coating quality, ultrasonic spraying is well-suited for fabricating bioactive coatings on porous anastomotic staples and overcomes technical bottlenecks of conventional surface modification methods. Driven by advances in minimally invasive surgery and precision medicine, this technology will undergo further technical refinement to advance the upgrading of porous staples toward high biocompatibility and multi-functional composite design. It will deliver safer and more reliable implant options for surgical anastomosis and tissue repair, promising extensive prospects in clinical translation and industrial commercialization.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

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