52 results about "Venous cannula" patented technology

This invention relates to a venous cannula for use in conjunction with cardiovascular examinations, treatments and surgery. The venous cannula is configured for two-stage drainage of oxygen-depleted venous blood from a central venous location via a peripheral venous insertion site, such as a femoral vein. The venous cannula is optimized for use in a cardiopulmonary bypass system that includes a multichannel arterial perfusion catheter. The cardiopulmonary bypass system is advantageous for use in performing standard open chest or least invasive cardiac surgical procedures.

A switch valve for use in an extracorporeal blood flow circuit comprises a valve housing having a chamber, four openings communicating with the chamber, and a valve member located in the valve chamber. A first opening is to be connected to a patient via an arterial cannula, a second opening is to be connected to a patient via an venous cannula, a third opening is to be connected to a first inlet / oulet of a blood treatment device, and a fourth opening is to be connected to a second inlet / outlet of a blood treatment device. The valve member is movable within the valve housing to fluidly connect the first opening to either the third or the fourth opening and to fluidly connect the second opening to either the third or the fourth opening. The width of the valve member is smaller than a peripheral dimension of the openings.

Method and apparatus for the extracorporeal treatment of blood by utilizing a peripherally inserted dual lumen catheter assembly for the continuous removal and return of blood for renal replacement treatment, in particularly, treatment of congestive heart failure and fluid overload by ultrafiltration. A catheter is inserted in a peripheral vein and maneuvered upward through the vascular system to access the reservoir of blood in the large or great veins for continuous blood withdrawal and treatment. Air-tight connectors are incorporated in the catheter assembly to overcome the untoward effects of negative pressure in blood withdrawal.

This invention relates to a venous cannula for use in conjunction with cardiovascular examinations, treatments and surgery. The venous cannula is configured for two-stage drainage of oxygen-depleted venous blood from a central venous location via a peripheral venous insertion site, such as a femoral vein. The venous cannula is optimized for use in a cardiopulmonary bypass system that includes a multichannel arterial perfusion catheter. The cardiopulmonary bypass system is advantageous for use in performing standard open chest or least invasive cardiac surgical procedures.

The invention relates to an amphibian isolated heart perfusion device. The device comprises an arterial cannula, a venous cannula, a drip recording electrode and an electrocardio lead electrode, wherein the arterial cannula is formed by combining an arterial cannula trunk, an aorta inserting end and a liquid discharging pipe through a three-way valve; the venous cannula is formed by combining a liquid storage tank, a postcaval vein inserting end and a liquid adding pipe through a three-way valve, and parts of the arterial cannula and the venous cannula are inserted and combined into one. The drip recording electrode comprises a drip recording electrode head, a drip recording electrode rod and a signal input end; the electrocardio lead electrode comprises an electrocardio lead electrode head, an electrocardio lead electrode rod, a signal input end, a heart outer wall liquid adding pipe and a three-way valve. The multifunctional amphibian isolated heart perfusion device is suitable for one person to operate, facilitates perfusion liquid replacement, and is suitable for synchronously and dynamically detecting dynamical changes of the cardiac output, myocardial contraction tension, electrocardiogram and various cardiac function indexes.

The invention provides an intelligent ECMO treatment device based on a rolling type blood pump and a control method of a system.The intelligent ECMO treatment device comprises a vein cannula, the rolling type blood pump, a membrane lung and an arterial cannula, the vein cannula is connected to an inlet of the rolling type blood pump through a first connecting pipe, and the rolling type blood pump is connected to an outlet of the artery cannula through a second connecting pipe; a venous pressure sensor is arranged on the first connecting pipe; an outlet of the rolling type blood pump is connected to an inlet of the membrane lung through an arteriovenous bridge tube, an artery overpressure sensor is arranged on the arteriovenous bridge tube, the membrane lung is further connected with an air and oxygen mixer and a temperature changing device, an outlet of the membrane lung is connected to the arterial cannula through a second connecting tube, and the arterial cannula is connected with the air and oxygen mixer through a second connecting tube. The venous pressure sensor and the artery overpressure sensor are respectively connected with the rolling type blood pump through the central processing unit. According to the invention, the perfusion pressure can be intelligently and accurately controlled, and finally constant-flow perfusion is achieved.

A method for determining the hematocrit and / or blood volume during an extracorporeal blood treatment with an extracorporeal blood circuit, in which blood is taken with a blood pump via an arterial cannula and an arterial flexible-tube line and blood is fed back via a venous flexible-tube line and a venous cannula. Pressure is measured in the extracorporeal blood circuit and a change in the hematocrit is determined from a change in the pressure. The respective relationship between hematocrit HKT or blood volume RBV and pressure P in the extracorporeal circuit is stored for various cannula diameters and various blood-flow values. The respective relationship for a given cannula diameter and blood flow is selected. The hematocrit and / or blood volume is determined taking account of the selected relationship.

The invention relates to a method and to a device for recognition of paravasal bleeding upon a supplying of blood to a vascular access via a line and / or upon the removal of blood from a vascular access via a line, particularly paravasal bleeding during extra-corporeal blood treatment, such as for hemodialysis, hemofiltration or hemodiafiltration. The invention furthermore relates to a device for extra-corporeal blood treatment, particularly for hemodialysis, hemofiltration or hemodiafiltration, comprising a device for recognition of paravasal bleeding. The method according to the invention and the device according to the invention are based on the change of arterial pressure in the arterial branch (5) or the venous pressure in the venous branch (7) of the extra-corporeal circuit (I) being registered during the extra-corporeal blood treatment. If paravasal bleeding occurs during the blood treatment, it is shown that the positive dynamic pressure on the line leading to the vascular access rises on the venous cannula during the extra-corporeal blood treatment, or the suction pressure on the line leaving the vascular access, such as the arterial cannula during extra-corporeal blood treatment, rises; that is, the suction pressure becomes more negative. The pressure rise begins moderately at first and then becomes increasingly greater. Decisive for the method according to the invention and the device according to the invention, therefore, is that pressure changes that come from a pressure level exhibiting a large difference from the reference value find stronger consideration than those that come from a pressure level that exhibits only a minor difference from the reference value.

The invention provides a separating and culturing method of primary duck liver cells. The method comprises the following steps: (1) selecting male Chongqing sheldrake at the age of 1-2 months, and injecting pentobarbital sodium and heparin into enterocoelia; (2) fixing the narcotized sheldrake to a board with venter upward, and excising the enterocoelia in a sterile condition; (3) performing venous cannula, and pouring reheated HBSS buffering liquid through a constant-flow pump; (4) pouring preheated GBSS buffering liquid through the constant-flow pump; (5) pouring the preheated GBSS mixed enzyme solution through the constant-flow pump; (6) shearing the GBSS mixed enzyme solution for tissue; oscillating and digesting; filtering through a sieving net; centrifuging; and removing the supernatant; (7) detecting the cell activity of the cell filtrate through trypan blue staining; (8) counting the cells, and suspending and inoculating to a cladded culture flask through a complete culture medium; and culturing in an environment that the temperature of 37 DEG C, and 5% of CO2 is added; (9) identifying the cell forms; (10) performing through ELISA; and (11) performing RT-PCR detection. Theseparating and culturing method of the duck liver cells is simple to operate; a large amount of cells can be obtained; the survival rate is high; the method is an ideal separating and culturing methodof the primary duck liver cells; and reliable cell resources are provided to test.

An assembly for an extracorporeal life support system with a suction line that features a venous cannula and a pressure line that features an arterial cannula furthermore includes a pump that is arranged between the suction line and the pressure line. This assembly has a discharge line with a discharge cannula, wherein the discharge cannula is longer than the arterial cannula, and wherein the discharge line is connected to the suction line or the pressure line.

The invention discloses a central venous cannula with multiple holes, and relates to the related fields of venous cannulas. The frequently occurred problem that in the prior art, blood can be drawn, but the cannula cannot be inserted, and then the depth of a puncture needle cannot be judged is solved. The puncture needle comprises a puncture needle main body, a puncture needle head is arranged onone side of the puncture needle main body, a puncture needle tail is arranged on the other side of the puncture needle main body, the puncture needle head is provided with a first needle head hole anda second needle head hole, the first needle head hole is formed in one side of the second needle head hole, a fixed tube is arranged outside one side of the puncture needle main body, and a connecting variable diameter tube is arranged on one side of the fixed tube, and a syringe fixing tube is arranged on the one side of the connecting variable diameter tube, and the syringe fixing tube and a syringe locating ring are internally provided with fixed cavities respectively; a first blood drawing channel and a second blood drawing channel are arranged in the puncture needle main body.