Retractable needle cannula insertion set with refinements to better control leakage, retraction speed and reuse
Patent 5575777 Issued on November 19, 1996. Estimated Expiration Date: 
April 10, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 10, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re34416 2737950 3589361 Syringe filter and valve combination Filtered hub device for aspirating and injecting liquids Catheter valve Retractable safety needle Puncture needle assembly Cannula insertion set with safety retracting needle Assembly of needle catheter protector InventorsApplicationNo. 422662 filed on 04/10/1995US Classes:604/198, Cover or protector for body entering conduit movable axially relative to one another604/110, Having means for preventing reuse of device604/168.01, Having telltale for showing entry of blood into conduit604/190Having fluid filterExaminersPrimary: Green, Randall L.Assistant: Alexander, V. Attorney, Agent or FirmInternational ClassA61M 005/32AbstractLeakage of blood from the insertion set, during and after safety-needle retraction, is suppressed by components that receive and retain flash blood for viewing--notwithstanding forces developed within the device in retraction. One preferred such system includes a flash chamber that moves with the retracting needle, within a hollow handle, carrying a relatively high flow-impedance element which allows air exhaust from the chamber into the handle to admit flash blood--but isolates blood in the chamber from retraction-generated increase in air pressure in the handle. Energy-absorbing components control or compensate for retraction speed, to provide quiet smooth retraction--while yet enabling use of ample retraction force to make retraction reliable. Among several energy absorbing systems disclosed is a preferred one that includes a viscous material introduced within the hollow handle to damp the retracting motion; and an injection port to facilitate introduction of the viscous material. Needle reuse, and concomitant risk of spreading disease, are avoided through components that deter needle redeployment--by deterring access to or forward motion of the needle, or trigger reengagement.Field of SearchCommon cover or protector for body entering conduit and material syringe reservoirCover or protector for body entering conduit movable axially relative to one another Material conduit forced into body by spring Portion of conduit stored in material supply means Means for reducing piston sliding friction (e.g., oil applicator, use of low friction material, etc.) Having means for preventing reuse of device Having guard on piercing conduit for protecting body entering conduit Removable cover or protector for body inserted conduit Entire body entering conduit stored in cavity in piston or piston actuator inside syringe prior to use Material flow controlled by valve or movable closure (e.g., plug in orifice, etc.) Having fluid filter By hydrophilic or hydrophobic filters | |
