Slide device, mechanical seal, pump and auxiliary artificial heart system

• US 10,010,661 B2
• Filed: 12/05/2014
• Issued: 07/03/2018
• Est. Priority Date: 02/19/2014
• Status: Active Grant

• Current Assignee: Sun Medical Technology Research Corporation (Misuzu & Sun Medical Holdings Co., Ltd.)
• Original Assignee: Sun Medical Technology Research Corporation (Misuzu & Sun Medical Holdings Co., Ltd.)
• Inventors: Kinoshita, Hisa, Kitano, Tomoya, Kaneshima, Keiichiro
• Primary Examiner(s): Manuel, George
• Application Number:
  US15/119,709
• Publication Number:
  US 20170049944A1
• Time in Patent Office: 1,306 Days
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/178 drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
• CPC Class Codes: A61M 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/441 generated by an electromotor
• CPC Class Codes: A61M 60/824 Hydrodynamic or fluid film bearings
• CPC Class Codes: A61M 60/827 Sealings between moving parts
• CPC Class Codes: A61M 60/829 having a purge fluid supply
• CPC Class Codes: A61M 60/857 Implantable blood tubes
• CPC Class Codes: A61M 60/88 Percutaneous cables
• CPC Class Codes: F04D 1/00 Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps adapted for pumping specific fluids F04D7/00; priming or boosting F04D9/00
• CPC Class Codes: F04D 29/0473 for radial pumps
• CPC Class Codes: F04D 29/061 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/126 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/128 with special means for adducting cooling or sealing fluid
• CPC Class Codes: F05D 2250/192 bevelled

Abstract

Provided is a slide device which includes a fixed-side slide member having an annular-shaped first slide surface, and a rotary-side slide member having an annular-shaped second slide surface, with the slide device being configured such that the first slide surface and the second slide surface are positioned opposite to each other, and an outer peripheral side of the fixed-side slide member and an outer peripheral side of the rotary-side slide member are brought into contact with a liquid containing a blood component, and a region where the first slide surface and the second slide surface face each other along the rotary-side slide member, the first slide surface and the second slide surface are brought into contact with each other on an outermost periphery of the opposite-facing region of the first and second slide surfaces.

Claims

1. A slide device comprising:

a fixed-side slide member having an annular-shaped first slide surface; and

a rotary-side slide member having an annular-shaped second slide surface, wherein the slide device is configured to be used in a state where the first slide surface and the second slide surface are made to opposedly face each other, and an outer peripheral side of the fixed-side slide member and an outer peripheral side of the rotary-side slide member are brought into contact with a liquid containing a blood component, wherein

assuming a region where the first slide surface and the second slide surface opposedly face each other as viewed in a direction along an axis of rotation of the rotary-side slide member as an opposedly facing region, the first slide surface and the second slide surface are brought into contact with each other on an outermost periphery of the opposedly facing region.

2. The slide device according to claim 1, wherein a gap is formed between the first slide surface and the second slide surface on an inner peripheral side of a contact position where the first slide surface and the second slide surface are brought into contact with each other, a size of the gap being increased as a distance toward the inner peripheral side from the contact position is increased, and

to express the size of the gap at an innermost periphery of the opposedly facing region along a direction parallel to the axis of rotation of the rotary-side slide member, the size of the gap at the innermost periphery is set to a value which falls within a range of from 0.2 μ

m to 0.8 μ

m.

3. The slide device according to claim 2, wherein an arithmetic average roughness of the first slide surface and an arithmetic average roughness of the second slide surface are set smaller than the size of the gap on the innermost periphery.

4. The slide device according to claim 1, wherein one slide surface out of the first slide surface and the second slide surface is formed in a flat surface shape perpendicular to the axis of rotation of the rotary-side slide member, and the other slide surface out of the first slide surface and the second slide surface is formed in a shape where the more the other slide surface extends toward the outer peripheral side, the more the other slide surface projects toward said one slide surface.

5. The slide device according to claim 1, wherein the first slide surface is formed in a shape where the more the first slide surface extends toward the outer peripheral side, the more the first slide surface projects toward the rotary-side slide member, and the second slide surface is formed in a shape where the more the second slide surface extends toward the outer peripheral side, the more the second slide surface projects toward the fixed-side slide member.

6. The slide device according to claim 1, wherein at least one slide member out of the fixed-side slide member and the rotary-side slide member is made of silicon carbide.

7. The slide device according to claim 1, wherein the slide device is a slide device which is used in a state where a predetermined liquid is made to pass on an inner peripheral side of the fixed-side slide member and on an inner peripheral side of the rotary-side slide member.

8. The slide device according to claim 1, wherein antithrombotic treatment is applied to an outer periphery of the fixed-side slide member and an outer periphery of the rotary-side slide member.

9. A mechanical seal equipped with the slide device according to claim 1.

10. A pump equipped with the mechanical seal according to claim 9.

11. The pump according to claim 10, wherein the pump is a blood pump.

12. An auxiliary artificial heart system equipped with the blood pump according to claim 11.