Device for the withdrawal and storage of individual fluid fractions lathered at given intervals

• US 5,066,283 A
• Filed: 03/08/1989
• Issued: 11/19/1991
• Est. Priority Date: 07/09/1987
• Status: Expired due to Term

• Current Assignee: AVL AG Grabenstrasse
• Original Assignee: AVL AG
• Inventors: Skrabal, Falko
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): Maglione, Corrine
• Application Number:
  US07/348,488
• Time in Patent Office: 986 Days
• Field of Search: 604/131, 604/149, 604/151, 604/152, 604/153, 604/48, 604/51, 604/65, 604/66, 604/67, 604/18, 604/19, 604/27, 128/762
• US Class Current: 604/152
• CPC Class Codes: A61B 10/0045 Devices for taking samples of body liquids devices for taking blood samples A61B5/15
• CPC Class Codes: A61B 10/007 for taking urine samples measuring urological functions A61B5/20; genital receptacles A61F5/451; urinals for bed-ridden persons A61G9/006
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence
• CPC Class Codes: A61B 5/1486 using enzyme electrodes, e.g. with immobilised oxidase
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150389 Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• CPC Class Codes: A61B 5/150511 Details of construction of shaft
• CPC Class Codes: A61B 5/150755 Blood sample preparation for further analysis, e.g. by separating blood components or by mixing
• CPC Class Codes: A61B 5/155 Devices specially adapted for continuous or multiple sampling, e.g. at predetermined intervals devices loaded with multiple lancets simultaneously A61B5/15146
• CPC Class Codes: A61B 5/4839 combined with drug delivery
• CPC Class Codes: A61M 1/77 Suction-irrigation systems aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208
• CPC Class Codes: A61M 5/1723 using feedback of body parameters, e.g. blood-sugar, pressure measurement of body parameters A61B5/00

Abstract

A device for withdrawing body fluids such as blood, urine and tissue fluid includes a withdrawal unit, a suction unit, and a storage system receiving the body fluid between the withdrawal unit and the suction unit, the storage system being divided into separate areas holding the fluid fractions gathered at given intervals and permitting the individual fluid fractions to be identified with regard to their time of withdrawal. In this way tests requiring repeated sampling at short intervals are made easier for doctor and patient.

Claims

1. A device for withdrawing body fluids, such as blood, urine, tissue fluid, comprising a withdrawal unit connected to a suction unit and a storage system which is situated between said suction unit and said withdrawal unit, said storage system comprises separable individual areas for respectively receiving and holding fractions of said body fluid gathered at certain sequential intervals, permitting said fluid fractions to be clearly identified with regard to their time of withdrawal, wherein said withdrawal unit is provided with an ingoing line for a liquid to be introduced into the body and an outgoing line for said body fluid to be gathered, and wherein said ingoing line is connected to a pressure unit.

2. A device according to claim 1, wherein said withdrawal unit is configured as a subcutaneous needle/catheter, or vascular needle, with two concentric channels, one of said channels is connected to said ingoing line and the other of said channels is connected to said outgoing line.

3. A device according to claim 1, comprising a reciprocating pump, being provided with a reservoir containing said liquid to be introduced into the body and serving as said pressure unit, and a suction chamber connected to said storage system and serving as said suction unit.

4. A device according to claim 3, comprising a receiving vessel of variable capacity, which is connected to said reservoir for said liquid to be introduced into the body via a flow-regulating element.

5. A device for withdrawing body fluids, such as blood, urine, tissue fluid, comprising a withdrawal unit connected to a suction unit and a storage system which is situated between said suction unit and said withdrawal unit, said storage system comprises separable individual areas for receiving and holding fractions of said body fluid gathered at certain intervals, permitting said fluid fractions to be clearly identified with regard to their time of withdrawal, wherein said withdrawal unit is provided with an ingoing line for a liquid to be introduced into the body and an outgoing line for said body fluid to be gathered, and wherein said ingoing line is connected to a pressure unit, said device further comprising drive units of said suction and said pressure unit, a control device for said storage system and a corresponding electronic control system, wherein said drive units, said control device and said electronic control system are located in a main housing, and wherein said storage system receiving said body fluid, said suction and pressure units and all connecting lines are located in a case which is detachable from said main housing.

6. A device according to claim 5, wherein said case is U-shaped, having halves being situated one on either side of said main housing, each including a number of individual branch lines, holding said fluid fractions.

7. A device according to claim 6, comprising a driving motor, which actuates said suction and pressure unit by means of a spindle drive, and which drives a camshaft via a reducing gear and a ratchet wheel, the cams of said camshaft cooperating with squeezer levers of said control device attached to said main housing, each of said cam-lifted lever giving access to one of said branch lines.

8. A device according to claim 6, wherein said branch lines and all flexible tubes of said storage system have small diameters, such that adhesive forces acting between the inner walls of said storage system and said body fluid are larger than exterior forces acting upon said device, such as gravitation or additional accelerating forces.

9. A device according to claim 6, wherein all said branch lines are connected to said suction unit via a manifold.

10. A device according to claim 5, wherein said case containing said storage system is connected to an adjustable cooling unit, which has a housing containing a cooling gel, and a wall of said housing facing said storage system is provided with openings having cross-sections, which are controlled via a thermostat, for admitting cooling air into said storage system.

11. A device according to claim 5, wherein said drive of said suction and pressure unit is reversible in order to withdraw said individual fluid fractions from said storage system.

12. A device according to claim 5, having a knob or crank cooperating with said suction and pressure unit and said control device of said storage system, in order to withdraw said individual fluid fractions from said storage system.

13. A device according to claim 5, wherein said withdrawal unit is configured as a subcutaneous needle/catheter, or vascular needle, with two concentric channels, one of said channels is connected to said ingoing line and the other of said channels is connected to said outgoing line.

14. A device according to claim 5, comprising a reciprocating pump, being provided with a reservoir containing said liquid to be introduced into the body and serving as said pressure unit, and a suction chamber connected to said storage system and serving as said suction unit.

15. A device according to claim 14, comprising a receiving vessel of variable capacity, which is connected to said reservoir for said liquid to be introduced into the body via a flow-regulating element.

16. A device according to claim 15, wherein said liquid to be introduced into the body is heparin and wherein said receiving vessel is provided with driving means ensuring a continuous supply of heparin to said withdrawal unit during a standstill of said suction and pressure unit.

17. An apparatus capable of withdrawing and storing separate samples of fluid taken from a body, said apparatus comprising:

an insertion device for insertion into a body,

a suction-generating means,

a storage means connected between said insertion device and said suction-generating means, said storage means including a plurality of parallel pipes in which separate samples of body fluid withdrawn by said insertion device from said body can be stored,

a pressure unit, and

an inlet line connected between said pressure unit and said insertion device, said pressure unit being capable of supplying liquid to said inlet line and said insertion device for introduction into said body.

18. An apparatus capable of withdrawing and storing separate samples of fluid taken from a body, said apparatus comprising:

an insertion device for insertion into a body,

a suction-generating means,

a storage means connected between said insertion device and said suction-generating means, said storage means including an elongated tube and means for introducing bubbles into said elongated tube for separating samples of body fluid therein which have been withdrawn by said insertion device from said body,

a pressure unit, and

an inlet line connected between said pressure unit and said insertion device, said pressure unit being capable of supplying liquid to said inlet line and said insertion device for introduction into said body.