Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-01-19
1992-09-15
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 43, 6048911, A61M 500
Patent
active
051473216
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for atraumatic access to the blood circuit. More particularly, the device comprises an implantable device for percutaneous removal of blood and a mechanism for controlling the flow of blood. The device makes it possible to treat, as often as necessary, an extra-corporal circulation of the blood, for example by an apparatus intended to compensate poor functioning of the kidneys.
Several devices for atraumatic access to the blood circuit are already known and in use, including devices similar to the present invention, having a rigid, biologically compatible, percutaneous body. For example, the prior art discloses devices like the present invention, having a central tubular segment which intersects and connects with the midpoint of another tubular segment, thereby bisecting the other tubular segment into two lateral segments.
The two lateral segments are each connected to an artificial line which is compatible with blood, and capable of being sutured onto an artery or a vein so as to form an arterio-venous shunt constantly traversed by a flow of blood.
The central segment of the T, which passes through the skin of the patient, comprises one or more obturation parts and a means for attaching a removable taking head. The removable head is typically connected to the circuit outside of the patient's body, and is capable of connecting at least one taking line and one reinjection line within the removable head with an internal blood circuit.
Like the present invention, previously known devices have shown blood taking and reinjection lines borne by a removable head and positioned so that an arterio-venous shunt with an internal blood circuit is achieved. The shunt is achieved either through an obturation part contained within the central segment, which passes through the skin, or by a passage in the axial direction through an obturation part and then through taking and reinjection lines.
One object of the present invention is to provide a device having taking and reinjection lines borne by a removable head which may be connected to an arterio-venous shunt by a simultaneous rotation of a removable head and an obturation part.
The atraumatic access devices disclosed by the prior art suffer from one or more of the following principal drawbacks:
Difficulty in applying disinfectant to complex obturation parts during cleaning procedures;
Low blood flow rates;
Complex methods and complicated tools needed for connecting and disconnecting the removable head, so that the patient is normally incapable of utilizing the device correctly with one hand;
Poor external bonding between the skin and the central segment of the device, creating a risk of microbial penetration;
Considerable mechanical stress placed upon the elastomer parts.
SUMMARY OF THE INVENTION
The present invention relates to a device for atraumatic access to the blood circuit. More particularly, the device comprises an implantable device for percutaneous removal of blood and a mechanism for controlling the flow of blood. The device makes it possible to treat, as often as is necessary, an extra-corporal circulation of the blood, for example by an apparatus intended to compensate poor functioning of the kidneys.
The present invention is extremely easy to use, the patient being able to operate it easily with one hand. The design of the present invention is conducive to maintaining asepsis, partly because the implanted device comprises only one mobile part, made of elastomer which is very easy to clean. Asepsis is further promoted because of a circuit which enables disinfection and rinsing so as to eliminate the risk of contamination by microbes contained in the air. In addition, because of the simplicity of the removable head and of the stopper, it is possible to make these parts consumable equipment.
There is minimal mechanical stress applied to the elastomer parts during operation of the present invention. In addition, there is a relatively high blood flow rate due to larger passage sections.
REFERENCES:
patent: 4092983 (1978-06-01), Silvenko
patent: 4108173 (1978-08-01), Silvenko et al.
patent: 4654033 (1987-03-01), Lapeyre et al.
patent: 4804369 (1989-02-01), Lapeyre et al.
Hamann Sylvie
Slonina, deceased Jean-Pierre
Biomasys
Maglione C.
Rosenbaum C. Fred
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