Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
1999-10-12
2001-05-22
Nguyen, Anhtuan T. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S110000, C604S164120
Reexamination Certificate
active
06235003
ABSTRACT:
BACKGROUND OF THE INVENTION
There are many safety syringe designs available today. All of these designs that have various types of latching devices are Z. M. Roehr et al U.S. Pat. No. 3,008,570, Z. M. Roehr U.S. Pat. No. 3,107,785, Bartner, et al U.S. Pat. No. 3,895,633, G K Burke U.S. Pat. No. 3,306,291, Gyure et al U.S. Pat. No. 4,300,678, Winstead Hall U.S. Pat. No. 6,356,822, Sampson U.S. Pat. No. 4,425,120, Larson U.S. Pat. No. 4,639,249, Harbaugh U.S. Pat. No. 4,655,751, Strauss U.S. Pat. No. 4,664,654, Braginetz U.S. Pat. No. 466,435, Spencer U.S. Pat. No. 4,702,738, Milorad U.S. Pat. No. 4,702,739, Spencer U.S. Pat. No. 4,801,295, Poncy U.S. Pat. No. 4,815,022, and Hughes U.S. Pat. No. 4,840,619.
Other designs have a retractable needle such as Weltman U.S. Pat. No. 3,306,290, and Dent U.S. Pat. No. 4,392,859. These designs do not have a means whereby the needle is extended from the syringe and held in place in a positive and rigid position in order to first inject the needle prior to injecting the medication. Still other designs have methods of bending the needle to render it harmless after the medication has been injected. Most of these designs have one major purpose and that is to prevent the spread of infectious diseases such as aids, hepatitis, or other diseases from an accidental injection with a contaminated needle into others after the needle of the syringe has been inserted into a patient with the above mentioned diseases. These various designs all work well up to a degree, but they all fall short of their intended purpose during the act of covering the needle, or removing the needle, which requires two hands.
Other devices such as Tsao U.S. Pat. No. 5,019,044, Tsao U.S. Pat. No. 5,084,018, Shaw U.S. Pat. No. 5,267,961, Shaw U.S. Pat. No. 5,389,076, Shaw U.S. Pat. No. 5,385,551, Shaw U.S. Pat. No. 5,120,310, Dysarz U.S. Pat. No. 4,978,343, and Dysarz U.S. Pat. No. 4,973,316 are capable of releasing the needle cannula if the container that they are packaged in is dropped or jarred severely. These devices do not have a positive latching means but they rely on friction to restrain the needle cannula with the biased spring.
All of these designs also combine the needle cannula with the syringe and therefore create a storage problem. At present, needle cannulas are fixed to the hub but not to the syringe so that a variety of lengths and gauges of needle cannulas are stored in one locker or storage cabinet which may contain about twenty various lengths and gauges of needle cannulas; an inventory of about twenty or more of each gauges and lengths of needle cannulas may be stored in each section. There may also be about ten sizes of syringes with about twenty or more of each syringe stored in the same locker. When a given quantity of a given medicament is required, the proper size of needle cannula is fitted to the proper syringe thereby combining the right length and gauge of needle cannula with the right size of syringe.
All of the above inventions would require an inventory ten times of that of the present invention. Each needle cannula size would have to be fixed to each syringe size and each syringe size would have to be fixed to each needle cannula size and this would be hundreds of needle cannula syringe combinations which would be multiplied by ten each the numbers required for the necessary inventory in a given floor of a hospital would be astronomical. The need has developed for a safety needle cannula that would be a module apart from the syringe.
SUMMARY
It is the object of this invention is to provide a safe, dependable and a positive latch and release means for a needle cannula wherein the needle cannula that is used is independent of the syringe and is retracted into the module hub chamber and protects others from an accidental pricking after the needle cannula has been used, the needle can be retracted into the module hub chamber with the use of only one hand and that one hand being the hand that was used to inject the needle into the patient.
Another object of the present invention is to render the needle cannula useless after the needle cannula is retracted into the module hub chamber and to further prevent the reuse and abuse by users of illicit drugs.
It is still another object of the present invention to further prevent the accidental release of the needle cannula after the needle cannula is in the hub chamber.
It is still yet another object of the present invention to provide a safety needle cannula and a latch and release means without modifying the syringe.
The foregoing and other objects and advantages are attained by a spring needle cannula, a hub chamber, a hub to fix the device to a standard syringe, an inclined plane latching means and a latch release means wherein when said needle cannula is used to inject a drug, medicament, or other material into a body the latch release means is activated and the coiled spring cannula withdraws the distal end of said spring needle cannula into the hub chamber rendering the spring needle cannula harmless to prevent the accidental pricking of others and to prevent the contaminated spring needle cannula from being removed from the hub chamber.
The features of the present invention can be best understood together with further objects and advantages by reference to the following descriptions when taken in connection with accompanying drawings, wherein like numerals indicate like parts.
REFERENCES:
patent: 3306290 (1967-02-01), Weltman
patent: 4392859 (1983-07-01), Dent
patent: 4973316 (1990-11-01), Dysarz
patent: 4978343 (1990-12-01), Dysarz
patent: 5019044 (1991-05-01), Tsao
patent: 5084018 (1992-01-01), Tsao
patent: 5120310 (1992-06-01), Shaw
patent: 5267961 (1993-12-01), Shaw
patent: 5385551 (1995-01-01), Shaw
patent: 5389076 (1995-02-01), Shaw
patent: 5997507 (1999-12-01), Dysarz
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