Advantages of PP Hemorrhoid Drug Delivery Device Design in Anorectal Medication Administration

           Hemorrhoids are classified into internal, external, and mixed types. Internal hemorrhoids are located deep within the anal canal, making it difficult to deliver medication effectively using manual application of ointments. Traditional administration methods suffer from poor hygiene, drug waste, and the risk of mucosal abrasion. The integrated PP syringe-type hemorrhoid drug delivery device shown in the figure leverages the properties of polypropylene (PP) material and a user-centered structural design to address various challenges in anorectal medication delivery, offering significant advantages in both clinical and home care settings.

            From a material standpoint, the device is made from medical-grade PP polypropylene, ensuring safe use. PP exhibits excellent chemical stability and does not react with hemorrhoid gels, ointments, or medical dressings, preventing the release of harmful substances that could contaminate medications. It is compatible with various water-soluble gels and traditional Chinese medicine ointments. The material is highly resilient, smooth, and soft, free from sharp edges or rigid corners. Additionally, its strong heat resistance meets the requirements for ethylene oxide sterilization, making it ideal for disposable sterile devices. Compared to conventional hard plastics, PP offers a gentle tactile sensation, minimizing irritation to the sensitive, inflamed hemorrhoidal mucosa during insertion and reducing discomfort such as stinging or foreign-body sensation. The semi-transparent shell allows users to clearly observe the remaining medication volume, enabling accurate dosing and avoiding under- or overdosing.

            The front-end drug delivery tip features a key design innovation: a tapered, elongated, and smoothly rounded conduit. The distal end is bluntly rounded without burrs or sharp edges, differing significantly from the sharp tips of standard syringes. Since the inner anal mucosa around hemorrhoids is often swollen, fragile, and prone to bleeding, sharp instruments can easily cause damage. The gradually tapering conduit facilitates smooth, gradual insertion into the anal canal, allowing lubricated gel to guide the device gently into the affected area and reach deep into internal hemorrhoids—overcoming the limitations of superficial topical application. A separate protective cap seals the tip during medication loading, storage, and transportation, preventing drug desiccation and loss while blocking environmental dust and bacterial contamination, ensuring each dose remains clean and uncontaminated.

            The integrated piston-based push mechanism enables precise and controlled drug delivery. The device employs a simple structure consisting of a barrel and an internal plunger piston, requiring minimal operation—users can administer medication with just one hand. The plunger stroke is uniform and stable, delivering medication at a steady pressure without sudden high-pressure spraying, thus preventing backflow or leakage. Many users currently apply ointments directly with their fingers, which not only leaves most of the medication on the anal opening but also risks introducing external bacteria and causing perianal infections. In contrast, this device requires no finger contact with either the lesion or the medication; instead, the drug travels directly through the conduit into the deeper parts of the anal canal, significantly reducing drug waste and ensuring sufficient coverage over the hemorrhoidal tissue, thereby improving local therapeutic outcomes. Limiting stoppers on both sides of the plunger control insertion depth, preventing excessive penetration into the lower rectum and balancing effective drug delivery with safety.

            The hygienic and single-use nature of the device aligns well with the needs of anorectal disease care. Hemorrhoid lesions involve open wounds, making them highly susceptible to cross-infection, especially when reusable devices are involved. PP material offers moderate production costs, making it suitable for mass manufacturing of individually packaged disposable products. After single use, the device can be discarded immediately, eliminating the need for cleaning or disinfection and completely avoiding secondary infection risks associated with inadequate instrument sanitation. For patients with postoperative perianal wounds or ruptured hemorrhoids, this sterile, single-use solution minimizes infection risks. The compact size and discreet design make it convenient to carry and use at home, during travel, or at work, effectively reducing user embarrassment and enhancing medication adherence.

             From a clinical efficacy perspective, this push-delivery method allows simultaneous retraction of the tube and medication injection, enabling even distribution of the drug along the inner walls of the anal canal while covering both internal hemorrhoids and the anal margin. In contrast, traditional topical application results in short drug retention time and rapid loss during defecation. The medication applicator delivers the drug directly to the affected area, prolonging contact time between the medication and mucous membranes, thereby enhancing absorption of active ingredients and more effectively relieving symptoms such as swelling, pain, heaviness, itching, and rectal bleeding. The device is highly versatile, with a standardized cylinder volume compatible with mainstream 2g and 3g hemorrhoid gels, and widely adaptable to medical-grade dressings, traditional Chinese medicine hemorrhoid ointments, and other products, supporting integrated filling production for pharmaceutical manufacturers.

             Overall, this PP hemorrhoid medication applicator combines safe materials, ergonomically designed tubing, and a controllable injection mechanism, ensuring safety, ease of use, precise dosing, and high hygiene standards—addressing the shortcomings of traditional administration methods. It meets the daily home care needs of general hemorrhoid patients while also being suitable for post-anal surgery wound treatment. This practical and cost-effective solution represents a leading choice for localized anal and rectal drug delivery and has become the standard accessory for hemorrhoid gel products.