Pressure reduction mechanism, puncture device, blood analysis device, and sensor mounting mechanism

• US 8,469,881 B2
• Filed: 10/15/2009
• Issued: 06/25/2013
• Est. Priority Date: 12/09/2008
• Status: Active Grant

• Current Assignee: PHC Holdings Corporation
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Fujiwara, Masaki, Hashimoto, Yohei
• Primary Examiner(s): DOUGHERTY, SEAN PATRICK
• Application Number:
  US13/133,258
• Publication Number:
  US 20110245635A1
• Time in Patent Office: 1,349 Days
• Field of Search: 600/583, 600/584, 606/181, 606/182
• US Class Current: 600/181
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150099 by negative pressure, other than vacuum extraction into a syringe by pulling on the piston rod or into pre-evacuated tubes
• CPC Class Codes: A61B 5/150198 Depth adjustment mechanism at the proximal end of the carrier of the piercing element
• CPC Class Codes: A61B 5/150221 Valves
• CPC Class Codes: A61B 5/150236 Pistons, i.e. cylindrical bodies that sit inside the syringe barrel, typically with an air tight seal, and slide in the barrel to create a vacuum or to expel blood
• CPC Class Codes: A61B 5/150358 Strips for collecting blood, e.g. absorbent optical reagent test strips G01N21/8483; chemical reagent test strips G01N33/4875, G01N33/52
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/151 Devices specially adapted for taking samples of capillary blood, e.g. by lancets , needles or blades
• CPC Class Codes: A61B 5/15111 Semi-automatically triggered, e.g. at the end of the cocking procedure, for instance by biasing the main drive spring or when reaching sufficient contact pressure, the piercing device is automatically triggered without any deliberate action by the user
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/15136 by use of radiation, e.g. laser
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit
• CPC Class Codes: A61B 5/15194 fully automatically retracted, i.e. the retraction does not require a deliberate action by the user, e.g. by terminating the contact with the patient's skin
• CPC Class Codes: A61B 5/157 Devices characterised by integrated means for measuring characteristics of blood

Abstract

Provided are a decompression mechanism capable of performing a desired pressure reduction by simple operation and having improved operability, a puncture device, a blood analysis device, and a sensor mounting mechanism. A needle puncturing device (100) is provided with: a piston (121) having at one end thereof an end part (121a) for forming a part of a sensor mounting mechanism (130) and at the other end an end part (121b) for slidably supporting a rod (112) of a lancet section (111); a cylinder (122) for slidably containing therein the end section (121b) of the piston (121); and packing (125) mounted to the inner periphery of the end part (121b) of the piston (121) and maintaining the air-tightness of the outer periphery of the rod (112). When the piston (121) is moved in the direction toward the cylinder (122) with a skin contact part (131) in contact with the skin, the volumes of an internal space (140) and a pressure reduction chamber (150) which are sealed by packing (123, 124) are increased to produce a reduced pressure.

Claims

1. A puncturing apparatus comprising:

a housing;

a puncturing section that is provided in the housing and punctures skin;

a puncturing mechanism that operates the puncturing section;

a cylinder having a bottom;

a piston having a first end part projecting from the bottom and a second end part that is located in the cylinder and slides along an axis of the cylinder;

a first sealing section that seals between the bottom and an outer surface of the piston;

a second sealing section that seals between the second end part and an inner surface of the cylinder;

a third sealing section that is located in a joint between the piston and the puncturing mechanism and seals between a hollow space opening in the first end part and the puncturing mechanism; and

an air chamber that is sealed with the first and second sealing sections and surrounded by the outer surface of the piston and the inner surface of the cylinder, wherein the piston has a connection hole that connects the air chamber with the hollow space.

2. The puncturing apparatus according to claim 1, wherein the first sealing section, the second sealing section or the third sealing section is packing.

3. The puncturing apparatus according to claim 1, wherein the first sealing section is a convex part that makes the bottom tightly contact the outer surface of the piston.

4. The puncturing apparatus according to claim 1, wherein the second sealing section is a convex part that makes the second end part tightly contact the inner surface of the cylinder.

5. The puncturing apparatus according to claim 1, wherein the first end part is a contacting part that can contact skin.

6. The puncturing apparatus according to claim 1, wherein the puncturing section is a laser emitting device that punctures skin with laser light.

7. The puncturing apparatus according to claim 1, wherein the puncturing section is a needle puncturing device that punctures skin with a puncturing needle.

8. The puncturing apparatus according to claim 7, further comprising:

a puncturing needle holder that holds the puncturing needle; and

a rod that slides the puncturing needle holder in the piston by puncturing operation of the puncturing mechanism, wherein the third sealing section slides the rod in the piston while keeping the rod airtight.

9. The puncturing apparatus according to claim 8, wherein the third sealing section is packing and adheres to the puncturing needle holder at a time of pressure reduction.

10. The puncturing apparatus according to claim 8, wherein the third sealing section is elastically deformable packing and deforms to wrap around the puncturing needle holder at a time of pressure reduction.

11. The puncturing apparatus according to claim 8, wherein:

the third sealing section is packing; and

the packing or the puncturing needle holder has a ring-like convex part on a surface adhering to the packing.

12. The puncturing apparatus according to claim 8, wherein:

the third sealing section is packing; and

the puncturing needle holder has a sucker structure on a surface adhering to the packing.