Surgery – Devices transferring fluids from within one area of body to...
Reexamination Certificate
2011-08-16
2011-08-16
Deak, Leslie (Department: 3761)
Surgery
Devices transferring fluids from within one area of body to...
Reexamination Certificate
active
07998103
ABSTRACT:
A shunt system for implantation of retrograde ventriculo-sinus shunts to establish a water tight connection that drains excess cerebrospinal fluid from hydrocephalic brain ventricles and delivers it, against the direction of blood flow, in a dural sinus comprising a valveless shunting catheter and a styforator. Retrograde ventriculo-sinus shunts mimic natural drainage of cerebrospinal fluid; they utilize natural forces to regulate the intraventricular pressure and to maintain it more than the sinus pressure, to prevent regurgitation of blood in the shunting catheter as a result of changes in posture or intra-thoracic pressure, to maintain a steady flow of cerebrospinal fluid to the venous circulation at a rate equal to and dependent upon the rate of it's formation, to discourage stagnation and clotting of blood at the venous end of the connection and to prevent siphonage in the erect posture.
REFERENCES:
patent: 2969066 (1961-01-01), Holter et al.
patent: 3020913 (1962-02-01), Heyer
patent: 3288142 (1966-11-01), Hakim
patent: 3769981 (1973-11-01), Schults
patent: 5385541 (1995-01-01), Kirsch et al.
patent: 5405316 (1995-04-01), Magram
patent: 6283934 (2001-09-01), Børgesen
Ismail L. El Shafei, et al., “Ventriculo-Jugular Shunt Against the Direction of Blood Flow, I. Role of the Internal Jugular Vein as an Antisiphonage Device”, Childs Nervous System, 3:282-284 (1987).
A. L Noordergraaf, Circulatory System Dynamics, Ch. 5, (1978).
W.L. McCabe, J.C. Smith, Unit Operations of Chemical Engineering, 2nd Edition, Ch. 3 “Fluid-flow Phenomena”, (1967) pp. 47-67.
Ismail L. El-Shafei and Mahmound A El-Rifaii, “Ventriculo-jugular shunt against the direction of blood flow. II Theoretical and experimental basis for shunting the cerebrospinal fluid against the direction of blood flow”, Child's Nervous System, (1987) 3:285-291.
Azza Mohamed Abdel Hamid El Shaarawy, “Study of Alternative Methods for Cerebrospinal Fluid Shunting to the Venous Circulation. Experimental Modeling”. Thesis submitted to the faculty of Engineering at Cairo University in partial fulfillement of the requirements for the degree of Doctor of Philosophy in Chemical Engineering, Mar. 1997.
Ismail L. El Shafei, “Ventriculo-jugular shunt against the direction of blood flow, III Operative technique and results”, Child's Nervous System, (1987) 3: 342-349.
Ismail El Shafei and Mohamed Hafez, “Ventriculo-jugular shunt against the direction of blood flow, IV Technical modifications and policy for treatment”, Child's Nervous system (1991) 7:197-204.
El Shafei IL, El Shafei HI, The retrograde ventriculo-sinus shunt. Concept and technique for treatment of hydrocephalus by shunting the cerebrospinal fluid to the superior sagittal sinus againt the direction of blood flow. Preliminary report. Child's nervous system (2001) 17:456-465.
Ismail L El Shafei, Hassan I El SHafei, “The retrograde ventriculo-sinus shunt (El Shafei RVS Shunt). Rationale, Evolution, Surgical technique and long term results.” Pediatric Neurosurgery 2005;41:305-317.
El Shafei Hassan Ismail
El Shafei Ismail Lotfy
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