Completely-depredated medicine carrying nasolacrimal stent and implantation system thereof
A completely degradable, nasolacrimal duct technology, applied in the field of medical devices, can solve the problems of increased patient pain and easy damage to the nasolacrimal duct intima when the nasolacrimal duct stent is taken out, achieves targeted drug release, relieves patient pain, pain relief effect
Inactive Publication Date: 2015-03-11
PUYI (SHANGHAI) BIOTECHNOLOGY CO LTD
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- Abstract
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Problems solved by technology
[0005] In order to solve the problem that the implantation of the nasolacrimal duct stent in the prior art easily damages the intima of the nasolacrimal duct, and the removal of the
Method used
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no. 1 example
[0062] For the first embodiment, after the nasolacrimal duct stent 1 is disengaged from the nasolacrimal duct dilator outer tube 41 in step S8, its fixed end is automatically stretched and becomes expanded to be supported in the nasolacrimal duct.
no. 2 example
[0063] For the second embodiment, step S9 is also included, the push rod 5 is stretched into the nasolacrimal duct of step S8, and the first half pipe 211 or the second half pipe 212 is promoted by means of the push rod 5 so that the first half pipe 211 and the second half pipe The half tubes 212 are aligned with each other, so that the nasolacrimal duct stent 1 is transformed from a compressed state to an expanded state to be supported in the nasolacrimal duct.
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Abstract
The invention relates to a completely-depredated medicine carrying nasolacrimal stent. The completely-depredated medicine carrying nasolacrimal stent comprises a sleeve-shaped drainage tube made of biodegradable high polymer materials; a medicine carrying groove is formed in the outer surface of the drainage tube; the drainage tube is of a structure capable of being compressed or expanded; and the diameter of at least a part of the drainage tube in the expanded state is larger than that of the part of drainage tube in the compressed state. After lumen rebuilding is completed, water and carbon dioxide are finally generated by the completely-depredated medicine carrying nasolacrimal stent to be discharged through the nasal cavity, and secondary operations are avoided, so that pains of a patient are omitted. The nasolacrimal stent is suitable for approaching the body from the nasal cavity, so that injuries, caused by the fact that the nasolacrimal stent approaches the body from the positions above the eyes, to the lacrimal ductile and the nasolacrimal canal inner membrane are avoided. According to the completely-depredated medicine carrying nasolacrimal stent, medicines are loaded through the medicine carrying groove, the medicine targeting release function is achieved, and the nasolacrimal canal is accordingly treated in a fixed point manner.
Description
technical field [0001] The invention relates to a medical device for eye diseases, more particularly to a fully degradable drug-loaded nasolacrimal duct stent and its implantation system. Background technique [0002] Nasolacrimal duct obstruction and chronic dacryocystitis are common eye diseases. The current treatment methods mainly include lacrimal duct probing and nasal dacryocystorostomy. Lacrimal duct probing is less invasive and easy to operate, but it requires repeated probing, which increases the pain of the patient, and has a high recurrence rate and poor therapeutic effect. Dacryocystorhinostomy is a classic surgical method. The purpose is to directly anastomose the lacrimal sac with the nasal mucosa, so that secretions and tears can directly enter the middle nasal passage from the lacrimal sac, so as to eliminate the purulent lesions of the lacrimal sac and relieve epiphora. This surgical method is the most effective method for the treatment of nasolacrimal duct...
Claims
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Login to view more IPC IPC(8): A61F2/90A61M31/00A61F2/95
Inventor 黄彬谢建李建军
Owner PUYI (SHANGHAI) BIOTECHNOLOGY CO LTD
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