53 results about "Blood withdrawal" patented technology

A blood withdrawal system for withdrawing blood for diagnostic purposes including a lancing device having a housing with an opening and a support surface, and a lancet holder movably mounted in the opening including a lancet and a bearing member that rests on the support surface. The device further includes a trigger unit which, when moved linearly, causes a rotational movement to initiate a lancing process.

A dual port vascular access assembly comprises a first access port and a second access port. The linkage is coupled between the first access port to close the second access port in the absence of an access tube in the first access port. Such port assemblies are particularly useful for implantation in patients receiving hemodialysis. By connecting the first access port to the blood withdrawal side of the system, blood withdrawal will be automatically terminated upon cessation of blood returned to due loss of the return access tube in the port assembly.

A blood withdrawal system for producing blood from a body part for diagnostic purposes, comprising a housing with a lancet guide capable of guiding a lancet on a predetermined puncturing path and a lancet drive for driving a puncturing movement of a lancet on the predetermined path. The lancet drive comprises a drive rotor driven by a drive spring and rotates about an axis during the puncturing movement, and a coupling mechanism which converts the rotational movement of the drive rotor into a puncturing movement, wherein the lancet is moved during a forward phase of the puncturing movement in the puncturing direction until its tip penetrates into the body part to create a wound and is retracted from the skin during a retraction phase of the puncturing movement. The coupling mechanism includes a translation element coupled to the lancet and guided by a guide on a movement path.

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.

In the apparatus and method for monitoring a vascular access (6) of an extracorporeal circuit (5; 10) of a patient, a control and calculation unit (17) varies a flow rate of a blood pump (9) predisposed to cause blood to circulate in the extracorporeal circuit. The control and calculation unit receives the pressure values in the blood withdrawal line (5) and the blood return line (10) from two pressure sensors (8, 12); the pressure values are a series of different values of the blood flow rate. The control and calculation unit processes the data gathered by means of a mathematical model which describes the variation of pressure in the vascular access as a function of the flow rate, in order to determine the blood flow rate in the vascular access. The invention detects the presence and location of a stenosis at the vascular access of a patient subjected to a hemodialysis treatment.

A peripherally inserted catheter assembly having multiple side holes to be inserted in a peripheral vein and maneuvered upward through the vascular system to access the reservoir of blood beyond and between the venous flappers for continuous blood withdrawal and treatment.

An intravenous system can be optimized to improve blood draw success and reduce hemolysis within the blood sample. Multiple optimizations can be made to an intravenous system, such as a peripheral intravenous catheter, to enhance the system's ability to provide blood samples having sufficient quality for many different tests. These optimizations can include features which enable an intravenous system, such as a peripheral intravenous catheter, to continue to perform efficiently when used to obtain blood samples even after the system has been placed within the patient's vasculature for a substantial duration of time. Also, these optimizations can include features for optimizing the fluid path and flow characteristics during blood withdrawal to minimize the amount of hemolysis that may be caused during withdrawal. Further, these optimizations can include features for integrating blood acquisition and dispense capabilities within the system.

The present invention provides a highly automated puncture system for inserting a cannula or a needle into a blood vessel of a person or an animal. The puncture system has an acquisition module that allows for determining at least a location of a blood vessel underneath of the surface of a skin and is further enabled to determine an optimal puncture location that is well suitable for inserting a cannula into the blood vessel. Further, the puncture system has an actuator for moving and aligning the cannula to a determined position. The system is further adapted to autonomously insert the cannula into the blood vessel for multiple purposes, such as blood withdrawal, venous medication and infusions.

A circuit for extracorporeal blood circulation, which is used for a single-needle dialysis, comprises a blood withdrawal line (2) having an arterial pump portion (23), and a blood return line (4) having a venous pump portion (43). Pump portions are designed to be coupled with corresponding peristaltic pumps (6), (7). An arterial expansion chamber (25) is arranged on the withdrawal line downstream from said arterial pump portion. A venous expansion chamber (45) is arranged on the return line upstream from said venous pump portion. The two expansion chambers are firmly joined one to the other into an integrated structure (9), which is equipped inside with two ducts connecting the arterial expansion chamber with two fluid connections attached outside to the integrated structure. The circuit can be assembled and disassembled from a dialysis machine easily and rapidly.

The invention discloses a painless blood collection device based on acupuncture in a negative pressure environment. The principle is to pre-set a vacuum environment before triggering the puncture needle. When preparing to take blood, the skin and the ejection shell form a closed space. When the puncture needle is triggered, the vacuum chamber and the closed space are connected to form a negative pressure environment. The blood collection needle only needs to puncture a very shallow area The skin, with the assistance of negative pressure, can achieve the required blood collection volume. After the finger releases the locking structure, the connected air hole can eliminate the negative pressure state and complete the blood collection process. This article provides two embodiments, one is a reusable negative pressure painless blood collection device, and the other is a disposable negative pressure painless blood collection device.

The present invention comprises methods and apparatuses that can provide accurate measurement of glucose or other analytes from a multilumen catheter in the presence of infusion of substances, including glucose. Examples of “multilumen catheters” include central venous catheters having multiple lumens, midline catheters having multiple lumens, multiple catheters configured or emplaced such that their lumens are in proximity to each other, and, in the case of indwelling analyte sensors, a catheter with a lumen for infusion and an indwelling sensor spaced apart from the infusion lumen. For blood withdrawal, anti-cross contamination controls can prevent the entrainment of blood which might be contaminated with feeding fluids or medications that are administered through other lumens within the catheter and in proximity of the blood sampling port. Cross contamination can occur under various situations, and is known to occur when the patient is connected to a ventilator. The ventilator cyclically raises the intra-thoracic pressure and diminishes blood flow rate in the central veins returning to the heart. The diminished flow can increase the chances for cross-contamination when additional lumens are introducing fluids during a draw sample.

An apparatus for extracorporeal treatment of blood (1) comprising a treatment unit, a blood withdrawal line, a blood return line, a preparation line and a spent dialysate line. A control unit (10) is configured to calculate values of a parameter relating to treatment effectiveness based on measures of the conductivity in the spent dialysate line. The value of the effectiveness parameter is calculated using one or more values representative of the conductivity in the spent dialysate line obtained relying on a mathematical model.

The invention relates to a blood withdrawal cannula (4) for connecting a pump (2) assisting or replacing activity of the heart to the inner volume of a heart ventricle (1), in particular the left ventricle. At the end thereof that is located in the ventricle the cannula has a pressure sensor (7a, 7b) for measuring the ventricle pressure and/or ventricle pressure differences and at the same end of the cannula has a volume sensor (3a, 3b, 5, 6) for measuring the volume and/or volume changes of the ventricle (1) in at least a partial region of the ventricle. The invention further relates to a measuring device for monitoring the ventricle contractions and/or the function of a pump replacing or assisting activity of the heart. The measuring device can be/is connected to the pressure sensor (7a, 7b) and to the volume sensor of a blood withdrawal cannula according to any one of the preceding claims and is designed to detect pressure changes and volume changes of a ventricle (1) as the heart is beating.

An apparatus for extracorporeal treatment of blood (1) comprising a filtration unit (2), a blood withdrawal line (6), a blood return line (7), an effluent fluid line (13), a pre and/or post-dilution fluid line (15, 25) connected to the blood withdrawal line, and a dialysis fluid line. Pumps (17, 18, 21, 22, 27) act on the fluid lines for regulating the flow of fluid. A control unit (10) is configured to periodically calculate a new value for the patient fluid removal rate to be imposed on an ultrafiltration actuator in order to keep a predefined patient fluid removal rate across a reference time interval irrespective of machine down times.

The present invention concerns a blood withdrawal device comprising a one-piece cap and lancet and a painless impulse generator. The object of the present invention is to withdraw blood painlessly and to reduce a risk of a secondary infection. In order to achieve the object of the present invention, the blood withdrawal device of the present invention comprises a cap, a hollow body and a painless blood withdrawal device. The cap comprises a one-piece cap and lancet within which a lancet is movably combined and a hollow body for a detachable connection with a painless impulse generator or a main body of a blood withdrawal device. The hollow body comprises open ends on both side of the body thereby allowing the lancet to be detachable and the movable axis to be inserted within the body. The painless impulse generator is connected with the main body of the blood withdrawal device through a means for connecting with the main body of the blood withdrawal device defined at one side of the body thereby allowing the movement of the lancet needle and the cap by the movable axis. Therefore painless blood withdrawal is possible.