JPH0229944Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a mounting structure for a sealed terminal in a human body implantable power supply device such as a middle ear implant, which ensures the welding of the joint surface between the lid of the sealed case and the sealed terminal, and , the purpose is to make it cheaper.

Generally, devices to be implanted in a living body are required to be highly safe and reliable and have no tissue reaction with the living body. For this reason, for example:
In power supplies for middle ear implants, the various electrical circuit components are hermetically sealed in a stainless steel case, allowing implantation into living organisms.

That is, this type of compact rechargeable power supply device for middle ear implants is constructed as shown in FIGS. A sealed case 3 made of stainless steel (SUS316L) and a lid plate 4 made of stainless steel (SUS316L) that closes the opening of the sealed case 3,
An annular coil bobbin 6 that constitutes the exterior case of the power supply device and is attached to the board;
a secondary coil 7 wound around the coil bobbin 6;
A secondary battery 8 housed in the coil bobbin 6 and circuit components 9 such as a charging circuit, a filter, and a safety device.
Accordingly, the secondary side component 1 of the electromagnetically coupled charging device
0 is constructed, the upper case 1 and the lower case 2 are integrated by laser welding to form a sealed case 3, the secondary side component 10 is housed in the sealed case 3, and the sealed case 3 is closed with a lid. It is closed by a plate 4, and the lid plate 4 is hermetically fixed to the sealed case 3 by laser welding. When charging the secondary battery 8, a primary side component of an electromagnetic coupling type charging device consisting of a high frequency AC power source and a primary coil is provided, and the AC power source is driven to move the primary coil outside the sealed case 3. By coming close to the secondary coil 7, the secondary battery 8 is charged by electromagnetic coupling between the primary coil and the secondary coil 7.

In this way, in this type of power supply device, the case joint surfaces, that is, the upper case 1 and the lower case 2
Since the joint surfaces between the sealing case 3 and the lid plate 4 are airtightly joined by laser welding, complete sealing is possible and high reliability is achieved.

In the above-described rechargeable power supply device, when supplying power from the secondary battery 8 inside the sealed case 3 to an external load such as an amplifier, the terminal bar 11 of the power terminal is connected from the board 5 as shown in the figure. , 12 to the outside. In this case, it is necessary to use a hermetic terminal that is generally used for the terminal part of the case of a crystal resonator, that is, a sealed terminal 13 in which both terminal rods 11 and 12 are hermetically penetrated. Use the sealed terminal 13
is fixed to the cover plate 4. This sealed terminal 13 is
As shown in FIG. 3, an oblong terminal container 15 made of Kovar metal and having a flange 14 around the opening.
, two terminal rods 11 and 12 loosely inserted into two holes in the bottom wall of the terminal container 15, and a glass 16 sealed in the terminal container 15 and fixing both the terminal rods 11 and 12. and both terminal rods 11, 12
In addition to being insulated from each other, the spaces between both holes of the terminal container 15 and both terminal bars 11 and 12 are reliably sealed.

By the way, the conventional sealed terminal mounting device for fixing the sealed terminal 13 to the cover plate 4 has a terminal container 1 attached to the center of the cover plate 4, as shown in FIGS.
A horizontally long mounting hole 17 having a shape equal to the external shape of the terminal case 1 of the sealed terminal 13 is transparently provided in the mounting hole 17.
5 are fitted from above, and the annular joint surfaces of the cover plate 4 and the flange 14 of the terminal container 15 are welded by laser welding, and the sealed terminal 13 is hermetically fixed. Note that 18 indicates molten metal by laser welding.

However, according to the conventional mounting device, the lid plate 4
Although the mounting hole 17 is only transparently provided in the terminal, which simplifies the structure, the welding between the cover plate 4 and the flange 14 of the sealed terminal 13 requires welding of dissimilar metals such as stainless steel and Kovar metal. Furthermore, since there is a step in the joint surface, welding work becomes difficult, and cracks occur in the joint surface due to the difference in expansion and contraction rates of the two metals, making it impossible to obtain the desired airtight performance.

Therefore, in order to eliminate the above-mentioned drawbacks, as shown in FIG. The flange 14 of the sealed terminal 13 is fitted to the annular joint surface of the cover plate 4 and the flange 14 to form the same annular joint surface, and the joint surface is laser welded.

According to this, since there is no step between the joint surface of the cover plate 4 and the flange part 14, the inconvenience caused by conventional welding can be avoided, but the attachment hole 17' and the constricted part 19 of the cover plate 4 can be punched out with a mold. The height of the bent portion around the mounting hole 17' must be approximately twice the thickness of the cover plate 4, and there is no part for fixing the sealed terminal 13. There are drawbacks such as.

This idea was made with the above-mentioned points in mind; a mounting hole was made through the lid of the metal sealed case in which the electrical circuit components were housed, and the terminal rod was passed through the flange in an airtight manner. In the sealed terminal mounting device for fitting and fixing a sealed terminal into the mounting hole, a stepped portion is formed by etching on the outer periphery of the mounting hole of the lid, and the terminal is fitted into the mounting hole. The present invention provides a sealed terminal mounting device in which a joint surface of the same plane is formed between the flange portion of the sealed terminal and the step portion, and the sealed terminal is fixed by laser welding the joint surface.

Therefore, according to the sealed terminal mounting device of this invention, by forming a step by etching on the outer periphery of the mounting hole of the lid, the flange of the sealed terminal fitted into the lid and the mounting hole can be easily connected to each other. A coplanar joint surface can be formed between the two, and the laser welding of the joint surface can be performed reliably without cracking.
Furthermore, since the stepped portion can be easily formed by etching, it can be made at low cost, and the drawbacks of the conventional method can be overcome.

Next, this invention will be explained in detail with reference to FIG. 7 and subsequent drawings showing the main parts of an embodiment when applied to a rechargeable power supply device for a middle ear implant. Note that in these drawings, the same symbols as above indicate the same or corresponding items.

First, FIG. 7 and FIG. 8 showing one embodiment will be explained.

As shown in the figure, a sealed terminal 13 is installed in the center of the cover plate 4 made of stainless steel (SUS316L) with a thickness of 0.4 mm.
A horizontally long mounting hole 17 having a shape equal to the outer shape of the terminal container 15 is provided therethrough, and a flange 14 having a width equal to the width of the flange 14 of the sealed terminal 13 and a thickness equal to the width of the flange 14 of the sealed terminal 13 is provided at the upper edge of the mounting hole 17. An annular step 20 having a thickness of 0.2 mm is formed by etching, and the sealed terminal 1 is
The terminal container 15 of No. 3 is fitted into the mounting hole 17 of the cover plate 4 from above, and the flange 14 of the sealed terminal 13 is fitted into the stepped part 20 without any gap, so that the upper surface of the cover plate 4 and the upper surface of the flange 14 are fitted. Annular joint surface 2 of the same horizontal plane between
Form 1. In this case, the sealed terminal 13 is supported and fixed by fitting the flange portion 14 into the stepped portion 20. Then, the joint surface 21 is welded by laser welding, and the sealed terminal 13 is hermetically fixed to the cover plate 4 with the molten metal 18 by laser welding.

Therefore, according to the embodiment described above, since the joint surface 21 without steps and gaps can be formed between the cover plate 4 and the flange 14 of the sealed terminal 13, welding by laser welding can be performed reliably, and it is possible to perform welding by laser welding as required in the conventional method. No cracks will occur, and the step 2 of the cover plate 4
0 can be formed by etching, and this type of stepped portion 20 can be formed by etching.
Since the shape of the stepped portion 20 can be formed relatively freely,
This makes it extremely easy to form, and costs can be significantly reduced.

Next, FIG. 9 showing another embodiment will be explained.

What is shown in the figure is the upper surface of the outer periphery of the mounting hole 17 of the cover plate 4, that is, the upper surface of the outer periphery from a position shifted toward the outer periphery from the periphery of the mounting hole 17 by the width dimension of the flange 14 of the sealed terminal 13. , a step 22 is formed by etching, and the outer peripheral surface of the flange 14 of the sealed terminal 13 fitted in the mounting hole 17 and the step 2 are formed by etching.
An annular joint surface 23 having the same circumferential surface between the outer circumferential surface of 2 and the outer circumferential surface of
The sealed terminal 13 is hermetically fixed to the cover plate 4 by laser welding the joining surface 23.

Therefore, although the welding surface is different from that described above, the same effects as those described above can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view and an exploded perspective view of a general rechargeable power supply device for middle ear implants, Figures 3a and b are partially cutaway front and bottom views of a sealed terminal, Figures 4 and 2 are Figure 5 shows a conventional sealed terminal mounting device, Figure 4 is a front view, Figure 5 a and b
6 is a cutaway front view of another conventional sealed terminal mounting device, and FIG. 7 and the following drawings show the main parts of an embodiment of the sealed terminal mounting device of this invention. 7 and 8 show one embodiment, FIG. 7 is a cutaway front view, FIGS. 8a and b are a front view and plan view of the lid plate, and FIG. 9 is a cutaway of another embodiment. It is a front view. 3... Sealed case, 10... Secondary side component, 7
... Secondary coil, 8 ... Secondary battery, 9 ... Circuit components, 1 ... Upper case, 2 ... Lower case, 4 ... Lid plate, 17 ... Mounting hole, 14 ... Flange, 11 ,12
...Terminal bar, 13... Sealed terminal, 20, 22...
Stepped portion, 21, 23... joint surface.

Claims (1)

[Scope of utility model registration request] It consists of a metal sealed case, and charging circuit components including a secondary coil and a secondary battery that are housed in the case and constitute the secondary side of an electromagnetic coupling type charging device, and the sealed case is separated into upper and lower parts having an opening. It is composed of a case and a cover plate that closes the opening, a mounting hole is provided in the cover plate, and a sealed terminal having a flange and having a terminal rod passed through it in an airtight manner is fitted into the mounting hole. A stepped portion is formed by etching on the outer periphery of the mounting hole of the cover plate, and an identical step is formed between the flange of the sealed terminal fitted in the mounting hole and the stepped portion. A human body implantable power supply device, wherein a joint surface is formed and the sealed terminal is fixed by laser welding the joint surface.