Instrument for measuring living body components

• US 4,813,423 A
• Filed: 05/22/1987
• Issued: 03/21/1989
• Est. Priority Date: 12/23/1986
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Rayon Company Limited (Mitsubishi Chemical Holdings Corporation)
• Original Assignee: Mitsubishi Rayon Company Limited (Mitsubishi Chemical Holdings Corporation)
• Inventors: Katayama, Masao, Watanabe, Youjirou, Ooe, Akihiko, Uchida, Teruyoshi, Tashita, Junichi, Miyasaka, Katsuyuki, Yamamori, Hisayoshi
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US07/052,903
• Time in Patent Office: 669 Days
• Field of Search: 128/634, 128/632, 128/692, 128/673, 604/266 X
• US Class Current: 600/311
• CPC Class Codes: A61B 5/14503 invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors A61B5/1459, A61B5/1464, A61B5/1473, A61B5/1482, A61B5/14865 take precedence
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150992 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 tubing connectors and couplings A61M39/00
• 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: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3

Abstract

Disclosed is an instrument for measuring living body components, which has (i) a fine tube having at one end thereof a connection portion to be connected to an indwelling needle or indwelling catheter and an infusion portion, from which at least a blood anticoagulant solution can be infused, (ii) a fine linear sensor for measuring living body components, extended from the inferior of the fine tube to the outside through the connection portion, and (iii) a mechanism for introducing blood at least into the interior of a fine tube portion of the indwelling needle or catheter intermittently or periodically when the indwelling needle or catheter is connected to the fine tube and kept in the blood vessel and then discharging blood into the blood vessel. A sensing portion of the sensor is located within the fine tube portion of the indwelling needle or catheter when the indwelling needle or catheter is connected to the connection portion of the fine tube.

Claims

1. An instrument for measuring living body components, which comprises a (i) fine tube having at one end thereof a connection portion to be connected to an indwelling needle or indwelling catheter and an infusion portion, from which at least a solution of a blood anticoagulant can be infused;

(ii) a fine linear sensor for measuring living body components, which is extended from the interior of the fine tube to the outside through the connection portion; and

(iii) a mechanism for introducing blood at least into the interior of a fine tube portion of the indwelling needle or indwelling catheter intermittently or periodically when the indwelling needle or indwelling catheter is connected to the fine tube and kept in the blood vessel and then discharging blood into the blood vessel, said mechanism for introducing blood at least into the interior of the fine tube portion of the indwelling needle or indwelling catheter being a mechanism for intermittently or periodically applying a pressure to the wall of the fine tube and releasing said pressure, at least a part of the wall of the fine tube having an elasticity such that said part of the wall is deformed under application of an external pressure and then original shape of said part of the wall is restored when an external pressure different from said external pressure is applied or said external pressure is released; and

a sensing portion of the sensor being located within the fine tube portion of the indwelling needle or indwelling cathether is connected to the connection portion of the fine tube.

2. An instrument for measuring living body components according to claim 1, wherein the sensing portion of the sensor is located at a point distant by 10 mm or less from the top end of the indwelling needle or indwelling catheter.

3. An instrument for measuring living body components, which comprises a (i) fine tube having at one end thereof a connection portion to be connected to an indwelling needle or indwelling catheter and an infusion portion, from which at least a solution of a blood anticoagulant can be infused;

(ii) a fine linear sensor for measuring living body components, which is extended from the interior of the fine tube to the outside through the connection portion; and

(iii) a mechanism for introducing blood at least into the interior of a fine tube portion of the indwelling needle or indwelling cather intermittently or periodically when the indwelling needle or indwelling cathether is connected to the fine tube and kept in the blood vessel and then discharging blood into the blood vessel, said mechanism for introducing blood at least into the interior of the fine tube portion of the indwelling needle or indwelling catheter comprising means for defining a volume-variable hollow portion connected only to the interior of the fine tube and a mechanism for applying a pressure to said hollow portion and releasing the pressure; and

a sensing portion of the sensor being located within the fine tube portion of the indwelling needle or indwelling catheter when the indwelling needle or indwelling catheter is connected to the connection portion of the fine tube.

4. An instrument for measuring living body components according to claim 3, wherein the sensing portion of the sensor is located at a point distant by 10 mm or less from the top end of the indwelling needle or indwelling catheter.

5. An instrument for measuring living body components according to claim 3, wherein said means for defining a volume-variable hollow portion is a hollow balloon.

6. An instrument for measuring living body components according to claim 3, wherein said means for defining a volume-variable hollow portion is a syringe.