JPS63355Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blood centrifugal separator having a continuous rotor and having a rotary seal portion that isolates the inside of the rotor from outside air.

Generally, the rotor of a blood centrifuge that requires a rotary seal part is a continuous rotor or a zonal rotor, and is formally a mechanical seal type, which is complicated and expensive. In this conventional mechanical seal system, appropriate contact pressure is applied between two types of parts, one made of hard material and the other made of soft material, by the deformation of a spring or rubber.

In recent years, a method of continuously centrifuging blood to separate it into its components has attracted attention. In this case, since the separated blood components are transfused and the remaining components are returned to the donor, the rotor (seal portion) is required to be disposable. Therefore, there is a need for a seal part that is cheaper and has a simpler structure than conventional seal parts.

The present invention has been developed in view of the above-mentioned circumstances, and the purpose is to provide a blood centrifuge that is disposable, has a simple rotary seal structure, and is economically advantageous. .

The blood plasma centrifuge of the present invention includes an inlet pipe that is opened at the lower end of the vertical rotor at the center of rotation and held in a stopped state, and the rotor that has a core disposed inside and is driven to rotate. A liquid collecting chamber is provided in the reduced inner diameter part of the upper part of the core of the rotor and communicates with the outlet pipe fixed to the outer periphery of the inlet pipe, into which blood after blood cells have been separated from the blood supplied from the inlet pipe is guided. and a rotary seal portion formed in the upper part of the liquid collection chamber to isolate the inside and outside of the rotor, and the rotary seal portion is formed of a disk made of a hard material and formed on the outer periphery of the outlet pipe. and,
A ring member is fixed to a part of the rotor facing the upper and lower surfaces of the disk and has a lip portion made of an elastic material that makes low friction contact with the upper and lower surfaces of the disk.

An embodiment of the blood plasma centrifuge of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a sectional view of the main part of the rotor section, and FIG. 2 is a detailed view of the seal section. In FIG. 1, 1 is a rotor that is rotationally driven, and 2 is a rotor 1 at the center of rotation of the rotor 1.
This is an inlet pipe that is open at the lower inner end and is held in a stopped state. A core 3 is fixed within the rotor 1, and a separation chamber 10 is formed on the outer circumferential side of the core 3. A reduced inner diameter portion 11 of the rotor 1 is formed in the upper part of the core 3, and the reduced inner diameter portion 11 is provided at a predetermined interval to communicate with the outlet pipe 5 fixed to the outer periphery of the inlet pipe 2. A liquid collector 4 having two fixed blades 12, 12 is fixed to the outer periphery of the outlet pipe 2.
8 is a space formed above the liquid collector 4.

A rotary seal portion 13 is provided above the space 8 . As shown in FIG. 2, the rotary seal part 13 is fixed to a disk 7 made of a hard material that protrudes from the outer periphery of the outlet pipe 5, and to a portion of the rotor 1 that faces the upper and lower surfaces of the disk 7, respectively. The ring member 6 has a lip portion 14 formed to make low friction contact with the upper and lower surfaces of the rotor 7 and to isolate the inside of the rotor from outside air. Lip portion 14 and disk 7
A space 9 is formed around the outer periphery of the contact portion.

In this centrifuge, a pump (not shown)
The blood injected through the inlet pipe 2 passes through the bottom of the core 3, enters the separation chamber 10 from the channel at the end of the core 3 as indicated by the solid arrow, and flows upward. During this time, the particles (blood cells) in the blood are separated and the supernatant (blood serum) enters the liquid collector 4 as shown by the dotted line arrow, and from the liquid collector 4 passes through the liquid passage 5a and enters the outlet pipe 5 to the outside. is discharged.
In this case, blood is injected by the pump, separated within the rotor, becomes blood cells and clots, and sequentially moves within the rotor to reach the liquid collector 4 . At this time, the air remaining in the space 8 is sealed and the pressure increases. As a result, blood is introduced into the liquid collector 4 without flowing into the rotary seal portion 13 side. In addition, in the rotary seal portion 13, the lip portion 14 is connected to the disk 7.
The contact pressure is reduced by centrifugal force as the rotation speed increases, so the material is selected to ensure a sufficient seal. .

In this way, the blood plasma centrifuge of this example is
The conventional soft material in the rotary seal part is replaced with an elastic material, and disks made of hard material are mounted between the top and bottom, and contact pressure is generated by deformation of the elastic material, resulting in a simple structure and low cost. Can be manufactured.

3 and 4 respectively show other embodiments of the rotary seal portion, and the difference from the above embodiment is that in the above embodiment, as the rotation speed increases, the contact pressure of the lip portion 14 decreases. On the other hand, in the embodiment shown in FIG. 3, on the contrary, the contact pressure increases. That is, as the rotational speed increases,
The lip portion 14 deforms outward due to the centrifugal force, and the contact pressure also increases. However, since the air in the space 9 is compressed and the pressure increases, this amount is subtracted. Furthermore, 1
5 indicates the center of the rotation axis. Also, Fig. 4 is a combination of the embodiments shown in Figs. 2 and 3;
It works in the same way as in the figure. Both of the above embodiments have the same effects as those in FIGS. 1 and 2 by selecting the material, thickness, etc. so as to maintain proper contact.

As described above, the blood plasma centrifuge of the present invention has an economically advantageous effect in that the rotary seal part has a simple structure when it is disposable, and it also has seals on both the upper and lower surfaces of the disk. Therefore, even if the gap between one elastic ring member and the disk becomes larger than expected due to machine vibrations and the sealing effect in that area decreases, the other elastic ring member Since the gap between the disc and the disc becomes smaller than the expected one, the sealing effect in this area increases, so the sealing effect as a whole does not deteriorate.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the essential parts of an embodiment of the blood plasma centrifuge of the present invention, Fig. 2 is a detailed view of the rotary seal portion of Fig. 1, and Figs. FIG. 6 is a detailed view of another different embodiment of a rotary seal of a centrifuge; 1...rotor, 2...inlet pipe, 3...
... Core, 4 ... Liquid collector, 5 ... Outlet pipe, 6 ... Ring member, 7 ... Disk, 11 ... Inner diameter reduction part, 13 ... Rotating seal part, 14 ... Lip part.

Claims (1)

[Scope of utility model registration request] An inlet pipe that is opened at the lower end of the vertical rotor at the center of rotation and held in a stopped state; the rotor that has a core disposed inside and is driven to rotate; a liquid collecting chamber provided in the reduced inner diameter part and communicating with an output pipe fixed to the outer periphery of the inlet pipe, into which blood after blood cells have been separated from the blood supplied from the inlet pipe is guided; A blood centrifugal separator is provided with a rotary seal part formed in the upper part of the chamber to isolate the inside and outside of the rotor, the rotary seal part being made of a hard material and formed on the outer periphery of the outlet pipe. A blood centrifugal separator comprising a disk and a ring member fixed to the rotor and having a lip portion made of an elastic material that makes low friction contact with the upper and lower surfaces of the disk.