Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/153—Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
  • A61B5/154—Devices using pre-evacuated means
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/150007—Details
  • A61B5/150015—Source of blood
  • A61B5/15003—Source of blood for venous or arterial blood
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/150007—Details
  • A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
  • A61B5/150229—Pumps for assisting the blood sampling
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/150007—Details
  • A61B5/150946—Means for varying, regulating, indicating or limiting the speed or time of blood collection
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/150992—Blood sampling from a fluid line external to a patient, such as a catheter line, combined with an infusion line; blood sampling from indwelling needle sets, e.g. sealable ports, luer couplings, valves
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/150007—Details
  • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
  • A61B5/150381—Design of piercing elements
  • A61B5/150389—Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/15—Devices for taking samples of blood
  • A61B5/150007—Details
  • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
  • A61B5/150381—Design of piercing elements
  • A61B5/150503—Single-ended needles

Definitions

• the present invention relates to a device for continuous bloods pling for a longer period of time.
• Said systems are used for monitoring or mapping the level of bod substances in blood, which are secreted rythmically and thus appear in different concentrations during 24 hours.
• examples of such substances are especially hormones such as gro.wth hormon (GH) , luteotropic hormon (LH) , follicle stimulating hormon (FSH) prolactin and thyreoidea stimulating hormon, but also other puls tive substances of the body such as blood sugar and free fatty acids may be monitored.
• hormones such as gro.wth hormon (GH) , luteotropic hormon (LH) , follicle stimulating hormon (FSH) prolactin and thyreoidea stimulating hormon, but also other puls tive substances of the body such as blood sugar and free fatty acids may be monitored.
• the internal and external diameter is stepwise enlarged by replacing the first thin tube by a thicker tube, which in return is replaced by a thicker tube, having a diameter adjus ⁇ ted to the pumping device.
• the present invention relates to a portable device for continuou blood sampling, which consists of an antithrombogenic catheter tube, a means for controlling a continuous withdrawal of a deter mined blood quantity at even speed for a certain period of time, means for collecting the blood, said device being characterized a flexible tube placed at one end of the catheter tube, which flexible tube is connected to the patient's bloodvessle, and sai flexible tube has a connective means by which said flexible tube is fixed to the catheter tube by a corresponding connective mean which flexible tube further envelops a removable needle, and sai catheter tube has an internal diameter which is constant or con ⁇ tinuously rising or stepwise constant and evenly rising from the end connected to the patient to the withdrawal means.
• the external diameter of the catheter tube may possibly be in ⁇ creased to fit the withdrawal means. It is especially convenient to use a small, portable, rotating pumping device as the with ⁇ drawal means.
• an internal and external diameter of the catheter tube which at one end is ad ⁇ justed to the dimension of the blood vessle and at the other end, which cooperates with the withdrawal means, has an external diam ter which is adjusted to said withadrawal means. It appears to be especially convenient to place a hollow needle at that end of the catheter tube which is connected to a collective means for the blood.
• the hollow needle may perforate the cover of an evacuated collective means.
• This is preferably a test tube having a rubber stopper as cover. The change of test tubes may thereby be conducted by an automatized process.
• the needle, enveloped by the flexible tube, which is used to connect the catheter tube to the blood vessle, may be a Vasculon R or a Venflon R needle from Viggo AB.
• These needles are usually employed for intravenous administration of fluids, such as nutri ⁇ tional or medicinal solutions. They consist of a metal needle which protude somewhat from a closely fitting, flexible, plastic tube.
• the tube has a connective means which in this case is a screw joint making it possible to connect a ca ⁇ theter tube by means of a corresponding threaded joint, such as a Luer-lock joint.
• the needle enveloped by the plastic tube punctua ⁇ tes the blood vessle, whereafter the needle is removed and the plastic tube remains in the blood vessle.
• the catheter tube is thereafter positioned in the blood vessle through the flexible tube. If the catheter tube should become clotted, it can be re ⁇ moved from the blood vessle and replaced by a new catheter tube through the flexible tube without the need for punctuating the blood vessle of the patient again; thus avoiding pain and stress for the patient and resulting in a more comfortable sampling situation.
• cathether tube with a flange at the end which is introduced into the blood vessle, in order to mini ⁇ mize the risk of damaging the wall of the blood vessle. Further this reduces the risk that the catheter tube should be sucked on to the wall.
• An evenly increased inter ⁇ nal or also external diameter can be achieved by either using evenly increasing connective stages or by gradually increased streching of one end of the tube at production before the hepar nization process.
• the external diameter of the flexible tube inside the blood vessle should not exceed 1mm, and for smaller children it will b necessary to use a diameter of 0.8mm or less.
• Figure I shows the needle 5 enveloped by a flexible tube 2, whic tube is surmounted by a connective means 3.
• the needle 5 has a handle 6, which makes it easier to remove the needle 5 from of t tube 2.
• Figure II shows the catheter tube 1 with its connective means 4 before it is placed in the flexible tube 2.
• the catheter tube 1 has a connective stage 7 through which is achieved an increased internal and/or external diameter, which thereby is adjusted to fit the withdrawal means 8. This is prefe ably a pumping device.
• the catheter tube is surmounted by a holl needle 9, which makes it convenient to collect the blood in eva- cuated collective means.
• Figure III shows the catheter tube after it has been positioned in the tube 2 and with the two connective means, 3 and 4, connected to each other.
• a protective tube 12 has been arranged over the thinnest part of the catheter tube.
• the hollow needle 9 is placed in a collective means 10 through a piercable cover 11.
• Figure IV shows one possible transition stage in the catheter tube from one part of the tube having a smaller, constant internal and external diameter, adjusted to the diameter of the blood vessle, to another part of the tube, being larger and having a larger diameter, adjusted to fit the pumping device.
• Figure V shows another possible transition stage in a catheter tube from one part of the tube having an internal and external diameter, adjusted to the diameter of the blood vessle and an increasing internal and external diameter to another part of the tube, being larger and having an external diameter adjusted to fit the pumping device.
• the internal and external diametere of the tube may be raised continuously over the totale length, so that the necessary diameter correlated to the pumping device is achieved.
• a further possibility is that the internal diameter is held constant while the external diameter is increased evenly. This is achived by pulling out one end of the catheter tube at production.
• Both diameters may also be held constant if a pumping device is used with correspondingly small dimensions as the dimensions of the catheter tube inside the blood vessle.

Applications Claiming Priority (2)

Publications (1)

Family

ID=19893039

Family Applications (1)

Country Status (3)

Cited By (3)

Citations (8)

• 1990
  • 1990-03-30 NO NO90901472A patent/NO901472L/no unknown
• 1991
  • 1991-03-25 WO PCT/NO1991/000048 patent/WO1991015153A1/en unknown
  • 1991-03-25 AU AU75464/91A patent/AU7546491A/en not_active Abandoned

Patent Citations (8)

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