Reagent-introducing medical device configured to create laminar flow and rotating flow

• US 20070140914A1
• Filed: 12/21/2005
• Published: 06/21/2007
• Est. Priority Date: 12/21/2005
• Status: Abandoned Application

• Current Assignee: Asahi Intecc Company Limited
• Original Assignee: Asahi Intecc Company Limited
• Inventors: Taketani, Satoshi, Sawa, Yoshiki, Ozawa, Shinji, Watanabe, Nobuyoshi, Toyota, Yoshiho
• Application Number:
  US11/314,493
• Publication Number:
  US 20070140914A1
• Time in Patent Office: Days
• US Class Current: 422/100
• CPC Class Codes: A61M 25/0026 Multi-lumen catheters with stationary elements catheter assemblies comprising a catheter in combination with a guide tube, sheath or sleeve A61M2025/0681; catheters comprising telescoping coaxial elements A61M2025/0175
• CPC Class Codes: A61M 25/0084 being one or more injection needles
• CPC Class Codes: A61M 25/1002 characterised by balloon shape A61M25/1006, A61M25/1009 take precedence

Abstract

The invention provides a reagent-introducing medical device that can guide a reagent into a reagent injector while maintaining all biological materials contained in the reagent in a healthy state. In an embodiment of the reagent-introducing medical device, an apparatus body (12) comprises a channel (77, 78, 80, 50e) through which a reagent flows, as well as a reagent inlet (76) and outlet (21), and further comprises a first control mechanism (58, 64) for controlling the flow of the reagent to create a laminar reagent flow in the channel (77, 78, 80, 50e) and a second control mechanism (70) for further controlling the laminar reagent flow in the channel to create a rotational reagent flow.

Claims

1. A reagent-introducing medical device for controlling the injection of a reagent into the human body, comprising:

an apparatus body having a channel through which the reagent flows, an inlet through which the reagent enters the channel, and an outlet through which the reagent exits from the channel; and

a pressure control valve configured to elastically control pressure of the reagent in the channel of the apparatus body.

2. The reagent-introducing medical device of claim 1, wherein the pressure control valve is disposed upstream of the channel.

3. The reagent-introducing medical device of claim 1, wherein the channel has a ring-shaped cross section.

4. The reagent-introducing medical device of claim 3, wherein the apparatus body comprises a cylindrical body and a plunger member inserted in the cylindrical body, and the channel is defined between an inner wall of the cylindrical body and an outer wall of the plunger member.

5. The reagent-introducing medical device of claim 4, wherein the pressure-control valve is provided on or constituted by an upstream end of the plunger member which is elastically movable in an axial direction as the pressure of the liquid in the channel is controlled by the pressure-control valve.

6. The reagent-introducing medical device of claim 5, wherein the apparatus body further comprises a plunger cap having a through-hole, and a distance between the plunger cap and the pressure-control valve is elastically changeable.

7. The reagent-introducing medical device of claim 6, wherein the pressure-control valve is coupled to the plunger cap with an elastic member.

8. The reagent-introducing medical device of claim 1, wherein the inlet, the pressure-control valve, the channel, and the outlet are configured to maintain the maximum Reynolds number of the reagent flowing through the channel below the Reynolds number at which the reagent flow changes from laminar flow to turbulent flow.

9. The reagent-introducing medical device of claim 8, wherein the maximum Reynolds number, Re=vd/ν

, of the reagent flowing through the channel is between about 50 and about 2,300 wherein v is fluid velocity of the reagent, d is effective channel diameter, and ν

is dynamic coefficient of viscosity of the reagent, as measured when ν

is about 1.05×

10<sup>−

6</sup> m²/s and a flow rate is about 10.0 to about 25.0 mL/min wherein.

10. The reagent-introducing medical device of claim 1, further comprising a flow-direction control mechanism configured to apply rotational motion to the reagent when flowing through the channel in the apparatus body.

11. The reagent-introducing medical device of claim 10, wherein the flow-direction control mechanism comprises flow-regulating surfaces that contact the reagent upstream of the channel in the apparatus body and change the flow direction of the reagent, each of the flow-regulating surfaces having a curved or angled surface formed by twisting a plane parallel with the flow direction of the reagent around an axis running in parallel with the flow direction.

12. The reagent-introducing medical device of claim 11, wherein the flow-regulating surfaces are disposed at the pressure-control valve.

13. The reagent-introducing medical device of claim 10, wherein the flow-direction control mechanism comprises flow-regulating surfaces that contact the reagent when flowing through the channel in the apparatus body and change the flow direction of the reagent, each of the flow-regulating surfaces having a curved surface extending spirally along the flow direction of the reagent.

14. The reagent-introducing medical device of claim 4, wherein the plunger member has an outer surface having flow-regulating surfaces that change the flow direction of the reagent when flowing through the channel, each of the flow-regulating surfaces having a curved surface extending spirally along the flow direction of the reagent.

15. The reagent-introducing medical device of claim 1, which is configured to be connected between a syringe nozzle and a reagent injection catheter connector.

16. A reagent-introducing medical device for controlling the injection of a reagent into the human body, comprising:

an approximately cylindrical apparatus body for introducing the reagent from an inlet and discharges the reagent from an outlet;

a plunger member arranged inside the apparatus body, which is movable in a direction of separation from the inlet when the reagent is introduced from the inlet;

a rotational-flow generation mechanism installed on the plunger member and causing the reagent introduced into the apparatus body to form a rotational flow inside the apparatus body; and

an elastic member positioned between the plunger member and the apparatus body and applying a force to the inlet side of the plunger member.

17. The reagent-introducing medical device of claim 16, wherein the rotational-flow generation mechanism comprises a modified polygonal cylinder formed by twisting a polygonal cylinder extending in the axial direction of the plunger by a specified angle around the center of axis of the plunger, and wherein the polygonal cylinder comes into contact with the reagent flowing in the apparatus body and imparts a rotational flow thereto.

18. The reagent-introducing medical device of claim 16, wherein the plunger member comprises a body having an approximately cylindrical exterior periphery.

19. A reagent-introducing medical device for controlling the injection of a reagent into the human body, comprising:

an apparatus body having a channel through which the reagent flows, an inlet through which the reagent enters the channel, and an outlet through which the reagent exits from the channel; and

a first control means for causing laminar flow of the reagent through the channel in the apparatus body.

20. The reagent-introducing medical device of claim 19, further comprising a second control means for applying rotational motion to the reagent flow through the channel in the apparatus body.

21. The reagent-introducing medical device of claim 20, wherein the second control means comprises flow-regulating surfaces that contact the reagent flowing through the channel in the apparatus body and change the flow direction of the reagent, each of the flow-regulating surfaces having a curved or angled surface formed by twisting a plane parallel with the flow direction of the reagent around an axis running in parallel with the flow direction.

22. The reagent-introducing medical device of claim 20, wherein the second control means comprises flow-regulating surfaces that contact the reagent flowing through the channel in the apparatus body and change the flow direction of the reagent, each of the flow-regulating surfaces having a curved surface extending spirally along the flow direction of the reagent.

23. The reagent-introducing medical device of claim 19, wherein the first control means comprises a flow-rate control means for controlling the flow rate of the reagent by limiting the cross-section area of the channel using a channel cross-section area limiting mechanism.

24. The reagent-introducing medical device of claim 23, wherein the channel cross-section area limiting mechanism comprises a plunger member arranged inside the channel to be movable in a direction of separating from the inlet when the reagent flows into the channel, while the flow-rate control means comprises the plunger member and an elastic member that applies a force to the inlet side of the plunger member.

25. The reagent-introducing medical device of claim 24, wherein the plunger member and the elastic member are integrated with each other.

26. The reagent-introducing medical device of claim 24, wherein the elastic member is positioned at the inlet and between the apparatus body and the plunger member.

27. The reagent-introducing medical device of claim 24, wherein the plunger member is configured to block the inlet when the reagent does not flow into the channel.

28. A method for controlling the injection of a reagent into a human body, comprising:

passing the reagent through a channel configured to cause laminar flow of the reagent before injection of the reagent into the human body.

29. The method of claim 28, further comprising imparting rotational motion to the reagent as it passes through said channel.

30. The method of claim 28, wherein the passing step comprises maintaining the maximum Reynolds number of the reagent flowing through the channel within a range of about 50 to less than about 2,300.