Liquid administration tool

Patent metadata

Field	Value
Publication number	US-9950124-B2
Application number	US-201514640694-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Mar 11, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A liquid administration device includes a structure that includes an accommodation body configured to accommodate liquid therein and a needle configured to communicate with an inside of the accommodation body; an operation unit configured to discharge the liquid inside the accommodation body from the needle by moving toward the structure in a distal direction; a cover member that is movable between a protection position at which the needle is covered and an exposure position at which the needle is exposed; a first biasing member that biases the operation unit toward the structure in the distal direction; and a second biasing member that biases the cover member in the distal direction. The operation unit has a first contact portion and the structure has a second contact portion, the contact portions being configured to come into contact with each other when the operation unit moves toward the structure in the distal direction.

First claim

What is claimed is:

1. A liquid administration device for administering a liquid into a living body, comprising:
a structure that includes an accommodation body configured to accommodate a liquid therein and a needle configured to communicate with an inside of the accommodation body;
an operation unit configured to discharge the liquid inside the accommodation body from the needle by moving toward the structure in a distal direction;
a cover member that is movable between a protection position at which the needle is covered and an exposure position at which the needle is exposed;
a first biasing member that biases the operation unit toward the structure in the distal direction; and
a second biasing member that biases the cover member in the distal direction,
wherein the operation unit has a first contact portion and the structure has a second contact portion, the first contact portion and the second contact portion being configured to come into contact with each other when the operation unit moves toward the structure in the distal direction,
wherein the first contact portion and the second contact portion apply a pressing force against each other,
wherein the structure is rotatable with respect to the operation unit, and
wherein the liquid administration device is configured such that the first contact portion and the second contact portion do not come into contact with each other when the structure rotates with respect to the operation unit.

2. The liquid administration device according to claim 1 , wherein the first contact portion and the second contact portion are configured to intermittently come into contact with each other as the operation unit moves toward the structure in the distal direction.

3. The liquid administration device according to claim 1 , wherein the first contact portion and the second contact portion are configured to continuously come into contact with each other as the operation unit moves toward the structure in the distal direction.

4. The liquid administration device according claim 1 , wherein the liquid administration device is configured such that a contact resistance between the first contact portion and the second contact portion changes as the operation unit moves toward the structure in the distal direction.

5. The liquid administration device according to claim 4 ,
wherein the liquid administration device is configured such that a biasing force due to the first biasing member becomes smaller as the operation unit moves toward the structure in the distal direction, and
wherein the liquid administration device is configured such that the contact resistance between the first contact portion and the second contact portion becomes smaller as the operation unit moves toward the structure in the distal direction.

6. The liquid administration device according to claim 5 , wherein the liquid administration device is configured such that a difference between the contact resistance and the biasing force due to the first biasing member is maintained substantially constant as the operation unit moves toward the structure in the distal direction.

7. The liquid administration device according to claim 6 , wherein the liquid administration device comprises at least two first contact portions and at least two second contact portions, and
wherein the liquid administration device is configured such that the pressing forces generated by contact between the contact portions are constituted to be substantially canceled by each other in a direction along a plane orthogonal to a movement direction of the operation unit to the structure.

8. The liquid administration device according claim 2 , wherein the liquid administration device is configured such that a contact resistance between the first contact portion and the second contact portion changes as the operation unit moves toward the structure in the distal direction.

9. The liquid administration device according to claim 8 ,
wherein the liquid administration device is configured such that a biasing force due to the first biasing member becomes smaller as the operation unit moves toward the structure in the distal direction, and
wherein the liquid administration device is configured such that the contact resistance between the first contact portion and the second contact portion becomes smaller as the operation unit moves toward the structure in the distal direction.

10. The liquid administration device according to claim 9 , wherein the liquid administration device is configured such that the difference between the contact resistance and the biasing force due to the first biasing member is maintained substantially constant as the operation unit moves toward the structure in the distal direction.

11. The liquid administration device according to claim 10 , wherein the liquid administration device comprises at least two first contact portions and at least two second contact portions, and
wherein the liquid administration device is configured such that the pressing forces generated by contact between the contact portions are constituted to be substantially canceled by each other in a direction along a plane orthogonal to a movement direction of the operation unit to the structure.

12. The liquid administration device according claim 3 , wherein the liquid administration device is configured such that a contact resistance between the first contact portion and the second contact portion changes as the operation unit moves toward the structure in the distal direction.

13. The liquid administration device according to claim 12 ,
wherein the liquid administration device is configured such that a biasing force due to the first biasing member becomes smaller as the operation unit moves toward the structure in the distal direction, and
wherein the liquid administration device is configured such that the contact resistance between the first contact portion and the second contact portion becomes smaller as the operation unit moves toward the structure in the distal direction.

14. The liquid administration device according to claim 13 , wherein the liquid administration device is configured such that the difference between the contact resistance and the biasing force due to the first biasing member is maintained substantially constant as the operation unit moves toward the structure in the distal direction.

15. The liquid administration device according to claim 14 , wherein the liquid administration device comprises at least two first contact portions and at least two second contact portions, and
wherein the liquid administration device is configured such that the pressing forces generated by contact between the contact portions are constituted to be substantially canceled by each other in a direction along a plane orthogonal to a movement direction of the operation unit to the structure.

16. The liquid administration device according to claim 1 , wherein the liquid administration device comprises at least two first contact portions and at least two second contact portions, and
wherein the liquid administration device is configured such that the pressing forces generated by contact between the contact portions are constituted to be substantially canceled by each other in a direction along a plane orthogonal to a movement direction of the operation unit to the structure.

17. The liquid administration device according to claim 1 , wherein the operation unit comprises a cylindrical body that surrounds at least a portion of the structure.

18. The liquid administration device according to c

Assignees

• Terumo Corp

Inventors

• Imai Masaomi
• Iibuchi Ruriko
• ARINOBE Manabu

Classifications

• A61M5/3271

  with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position · CPC title

• A61M2005/3267

  Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body · CPC title

• A61M5/3272

  having projections following labyrinth paths · CPC title

• A61M2005/3247

  Means to impede repositioning of protection sleeve from needle covering to needle uncovering position · CPC title

• A61M5/3202

  Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001) · CPC title