Exploration of the Application of a Fine-Tube Powder Direct-Insertion Drug Delivery Device in Vaginal, Anorectal, and Nasal Cavities

 I. Product Structure and Core Advantages in Drug Delivery  

        The disposable fine-tube powder direct-insertion drug delivery device shown in the figure consists of a transparent medical-grade polypropylene (PP) tube body, a sealed rubber piston, a push rod, and a protective outer cap. The entire tube features smooth walls without burrs. The inner cavity can be pre-filled with antibacterial or tissue-repairing powders, sterilized via ethylene oxide, and individually packaged—making it an ideal non-invasive local drug delivery tool for narrow human cavities. Compared to washes, sprays, and suppositories, powder formulations combined with straight-push tubes offer multiple unique advantages: powder adheres firmly to mucous membranes for prolonged duration, resisting loss through secretions or bodily fluids, thereby extending therapeutic effects; free from solvent carriers, it reduces risks of mucosal irritation and allergic reactions; dosage is precisely controllable, with the fine inner diameter suitable for loading minute amounts of powder, accurately meeting localized treatment needs; single-use, sterile packaging eliminates cross-contamination, simplifies operation, enables patients to self-administer at home, significantly improving treatment compliance.

 II. Application in Gynecological Vaginal Drug Delivery  

         In gynecological inflammatory treatments, the fine-tube powder delivery device has become a mainstream tool for managing vaginitis, cervical erosion, and post-surgical vaginal recovery. For fungal or bacterial vaginitis, antibacterial powders containing sophora root, silver ions, or probiotics can be pre-loaded into the tube. During administration, the slender tube is gently inserted deep into the vagina, and the push rod releases the powder, which evenly coats the vaginal walls and cervical lesions, adsorbs abnormal secretions, and provides long-lasting antimicrobial and anti-itch effects. Traditional irrigation solutions may disrupt vaginal microbiota balance and easily leak out, while suppositories often melt and stain clothing. In contrast, dry and powder remains in place for 4–6 hours, offering superior repair of damaged mucosa.  

         For post-minimally invasive cervical surgery wound care, hemostatic and reparative herbal powders are delivered directly to the lesion site via the fine tube, isolating the area from external secretions and accelerating scab formation and healing. For menopausal women experiencing dryness and mucosal atrophy, nourishing and regenerative powders help restore the vaginal mucosal barrier. The device’s tube diameter matches the physiological width of the vagina, eliminating foreign-body friction pain. Its individual sterile packaging makes it suitable for both clinical outpatient settings and home care, making it now a standard companion device for hospital-prepared gynecological medications and intimate care products.

 III. Clinical Value in Anorectal Drug Delivery  

         In anorectal applications, the device is used for localized powder therapy in conditions such as hemorrhoids, anal fissures, perianal eczema, and rectitis. For internal or mixed hemorrhoids, the fine-tube applicator can be inserted 3–5 cm into the anus, delivering anti-swelling, hemostatic, and tissue-regenerating powders directly onto the affected hemorrhoidal tissue. The powder adheres closely to the mucosa, rapidly relieving congestion, bleeding, and swelling. Patients with anal fissures benefit from tissue-healing powders that fill the fissure, isolating it from fecal friction and reducing healing time.  

         From a pharmacokinetic perspective, the rich vascular network of the rectal mucosa allows efficient absorption of powders, bypassing the hepatic first-pass effect associated with oral drugs, thus enhancing bioavailability and minimizing gastrointestinal irritation—ideal for chronic anorectal patients intolerant to oral medication. Unlike ointments, powders do not clog anal glands or cause damp, muggy discomfort around the anus, making them more suitable for individuals with perianal eczema or itching. The smooth, rounded tip of the tube prevents mucosal abrasion, enabling safe use even in children and elderly patients with constipation. A smaller version of this device can also deliver relief powders for constipation management. It has gained widespread acceptance in both clinical nursing and home-based hemorrhoid care.

 IV. Local Drug Delivery in Nasal and Respiratory Tract Applications  

         The nasal cavity is narrow and deeply recessed, making conventional nasal drops prone to dripping into the pharynx and causing bitter taste, while nasal sprays often result in uneven distribution. The fine-tube powder delivery device effectively addresses these issues and is widely used for allergic rhinitis, sinusitis, nasal mucosal erosion, and post-surgical nasal reconstruction. During administration, the tube is gently inserted into the nasal cavity, and the piston is pressed to release a small amount of antibacterial or reparative powder. The powder adheres to the turbinates and openings of the sinuses, providing sustained protection against allergens and suppressing inflammatory exudation, thereby alleviating symptoms such as sneezing, nasal congestion, and clear nasal discharge. 。

The nasal mucosa is richly vascularized and connected to the intracranial space, allowing powder formulations administered via the nose to bypass the blood-brain barrier. Some traditional Chinese medicine powders for nasal administration are absorbed through the nasal route, enabling systemic regulation with a dosage only one-fifth of that required orally, resulting in lower toxicity and side effects. Guangzhou University of Traditional Chinese Medicine... 。 For post-endoscopic sinus surgery wounds, the hemostatic repair powder reaches the sinus cavity directly through a fine tube, reducing nasal bleeding and adhesions. For pediatric allergic rhinitis, a miniature delivery device can be used—gentle and non-irritating, avoiding patient resistance caused by spray noise—making it a commonly used medication tool in otolaryngology outpatient clinics.

 V. Comprehensive Application Prospects and Industry Trends

         The powder delivery device with straight tube meets the medication needs of three major body cavities and combines both clinical medical and home care attributes, aligning well with current pharmaceutical trends toward non-invasive local drug delivery and long-term controlled release. From product characteristics, its medical-grade plastic material is acid- and alkali-resistant, suitable for sterilized packaging of various Chinese and Western medicine powders; the transparent barrel allows clear visualization of remaining dosage, while the uniform push force ensures smooth, clog-free powder dispensation.

         In the medical sector, primary clinics, gynecology, proctology, and otolaryngology departments frequently purchase these devices in bulk to support in-house preparation administration. In consumer markets, personal care, anal-rectal hygiene, and rhinitis care products under health product classification commonly incorporate this device to meet consumers’ at-home self-medication needs. Compared to liquid or ointment-based delivery systems, the powder combined with a fine-tube push mechanism offers stable storage, eliminates the need for preservatives, extends shelf life, and reduces production costs.

         Moreover, there remains room for optimization: multiple sizes can be designed based on cavity depth and width—short versions for nasal use, longer ones for vaginal or anal applications. Some models feature rounded tips and graduated markings to further enhance safety. As localized cavity therapies continue to gain popularity, these compact powder-pushing delivery devices will expand their application in chronic disease management across gynecology, proctology, and otolaryngology, becoming an essential foundational tool within non-invasive local drug delivery systems.