Two-needle ceramic feed-through for deep brain stimulator

Abstract

The utility model relates to the field of feed-through connectors, in particular to a two-pin ceramic feed-through for a deep brain stimulator, which comprises a ceramic insulator, a flange and two probes, a first through hole is vertically arranged in the middle of the flange in a penetrating manner, the insulator is positioned in the first through hole, two second through holes are vertically arranged on the insulator in a penetrating manner and are probe placing holes, and the two probes are arranged in the first through hole in a penetrating manner. The two second through holes are formed in the base and penetrate through the two second through holes respectively, brazing filler metal containing holes are formed in one ends of the two second through holes, the two brazing filler metal containing holes are located in the different ends of the two second through holes respectively, and the brazing filler metal containing holes are symmetrically distributed, so that the machining stress can be reduced, it is guaranteed that brazing filler metal cannot interfere with each other during curing, and the product reliability is improved; the outer side of the flange is provided with a grounding pin, and the arrangement of the grounding pin can ensure the electrical safety of the whole device.

Description

Technical Field

[0001] The utility model relates to the technical field of feedthrough connectors, in particular to a 2-pin ceramic feedthrough for a deep brain stimulator. Background Art

[0002] Deep brain stimulators, also known as "brain pacemakers", are implantable devices that are mainly used to reversibly regulate the brain. Deep brain stimulators use electrodes to accurately send electrical pulses to specific areas of the brain. In the implant of a deep brain stimulator, a feedthrough is needed to connect the implanted chip to the target electrode. The implant feedthrough components need to have extremely high structural strength, reliability, airtightness, and insulation.

[0003] As a feedthrough component, the ceramic feedthrough connector has excellent insulation performance, can effectively provide electrical connection, and ensure the stable transmission of stimulation signals. Among them, the 2-pin ceramic feedthrough has a higher current carrying capacity and better insulation performance due to its larger diameter probe and longer probe distance. Compared with the 8-pin ceramic feedthrough, the 2-pin ceramic feedthrough is smaller in size, higher in strength and reliability, and is often used in micro-neurostimulator implants with a smaller number of channels.

[0004] Existing 2-pin ceramic feed-through connectors often adopt a single-sided countersunk hole solution, which will cause obvious stress concentration during the welding process and reduce the reliability of the product. At the same time, as a device implanted in the human body, the ceramic feed-through connector needs to work stably for a long time in the human body. When the human body comes into contact with a charged object or static electricity on the ground, it will affect the working performance of the ceramic feed-through connector and reduce the quality of signal transmission. Utility Model Content

[0005] The utility model provides a 2-pin ceramic feedthrough for a deep brain stimulator.

[0006] The technical solution of this utility model is as follows:

[0007] A 2-pin ceramic feedthrough for a deep brain stimulator, comprising a ceramic insulator, a flange, and a probe, characterized in that:

[0008] A first through hole is vertically penetrated in the middle of the flange, and the ceramic insulator is located in the first through hole;

[0009] The ceramic insulator is vertically provided with two second through holes as probe placement holes, and the probes are provided with two and are respectively arranged through the two second through holes;

[0010] One end of each of the two second through holes is provided with a solder placement hole, and the two solder placement holes are respectively located at different ends of the two second through holes;

[0011] A grounding pin is arranged on the outer side of the flange.

[0012] Specifically, a supporting ring is provided in the inner circle of the lower end of the first through hole, and the lower end of the ceramic insulator abuts against the upper side of the supporting ring.

[0013] Furthermore, the upper end of the ceramic insulator extends out of the upper end of the first through hole.

[0014] Preferably, a boss is arranged around the outer side of the flange.

[0015] Furthermore, the boss is at the same distance from the upper end of the ceramic insulator and the lower end of the flange.

[0016] Preferably, the ceramic insulator is a cylindrical structure.

[0017] Preferably, the two probes are at the same distance from the axis of the ceramic insulator.

[0018] Specifically, the depths of the two solder placement holes are set to be the same.

[0019] Furthermore, the height of the upper end of the ceramic insulator extending out of the first through hole is not greater than 1 / 2 of its total height.

[0020] Preferably, an annular groove is provided on the outer side of the upper end of the first through hole, and the lower end of the annular groove is inclined downward.

[0021] The beneficial effects of the utility model are:

[0022] (1) The utility model is a 2-pin ceramic feedthrough for a deep brain stimulator. Solder placement holes are set on both sides of the ceramic insulator, and the solder placement holes are symmetrically distributed, which effectively reduces the stress during the processing of the 2-pin ceramic feedthrough and ensures that the solder will not interfere with each other when solidifying, thereby increasing the reliability of the product. The structural setting of the utility model minimizes the volume of the ceramic feedthrough to the greatest extent, which is conducive to the miniaturization development of the ceramic feedthrough.

[0023] (2) A ground pin is provided on the outside of the flange to ensure the electrical safety of the entire 2-pin ceramic feedthrough, prevent interference in signal transmission caused by contact with charged objects and accumulation of static electricity, and further protect the electronic components inside the deep brain stimulator from electrical damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.

[0025] In the attached picture:

[0026] Figure 1 Schematic diagram of the structure of a 2-pin ceramic feedthrough for a deep brain stimulator in an embodiment;

[0027] The components represented by the reference numerals in the figure are:

[0028] 1. Ceramic insulator; 2. Flange; 3. Probe; 4. Grounding pin; 5. Boss; 6. Probe placement hole; 7. Solder placement hole; 8. Annular groove; 9. Support ring. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0030] Example

[0031] This embodiment provides a 2-pin ceramic feedthrough for a deep brain stimulator, see Figure 1 , comprising a ceramic insulator 1, a flange 2, and a probe 3, characterized in that:

[0032] A first through hole is vertically penetrated in the middle of the flange 2, and the ceramic insulator 1 is located in the first through hole;

[0033] The ceramic insulator 1 is vertically provided with two second through holes as probe placement holes 6, and the probes 3 are provided with two and are respectively arranged through the two second through holes;

[0034] One end of each of the two second through holes is provided with a solder placement hole 7, and the two solder placement holes 7 are located at different ends of the two second through holes;

[0035] A grounding pin 4 is disposed on the outer side of the flange 2 .

[0036] Specifically, a first through hole is vertically penetrated in the middle of the flange 2, and the ceramic insulator 1 is located in the first through hole. The ceramic insulator 1 uses more than 99% alumina ceramics, aluminum nitride ceramics or zirconium oxide ceramics, and the ceramic insulator has excellent insulation performance and high-temperature stability; the ceramic insulator 1 is a cylindrical structure with a diameter between 1.5-9mm and a thickness between 1-2mm.

[0037] Two second through holes are vertically provided on the ceramic insulator 1 as probe placement holes 6 for placing probes 3. Two probes 3 are provided, and they are respectively arranged through the two second through holes, and the distance between the two probes 3 and the axis of the ceramic insulator 1 is the same. This design allows two probes 3 to work simultaneously, and is suitable for the transmission of dual-channel signals. The probe 3 is used as a signal transmission medium, and the material is 99.95% Pt, 99.95% Nb or Pt90Ir10 alloy with low contact resistance, and has good biocompatibility; in this embodiment, the diameter of the probe 3 is 0.3-0.5mm, and the length is 10-50mm. In order to facilitate the subsequent soldering between the 2-pin ceramic feedthrough and the circuit board, the end of the probe can be pre-tinned, and the thickness of the tin plating is between 10-30um, and the length of the tin plating is between 3-7mm.

[0038] A solder placement hole 7 is provided at one end of each of the second through holes, and the two solder placement holes 7 are located at different ends of the two second through holes, and the depths of the two solder placement holes 7 are set to be the same. The two solder placement holes 7 are symmetrically distributed on both sides of the ceramic insulator 1, which minimizes the volume of the two-pin ceramic feedthrough without reducing the performance of the ceramic insulator 1 itself, and also reduces the stress during the processing, resulting in a higher yield rate and smaller welding stress after brazing.

[0039] In this embodiment, the solder used for brazing is 99.95% or more pure gold, and the probe 3, the ceramic insulator 1, and the flange 2 constituting the 2-pin ceramic feed-through connector are welded together under high temperature vacuum conditions.

[0040] Flange 2 is used to fix ceramic insulator 1, provide mechanical support, and ensure the structural stability of the entire 2-pin ceramic feedthrough. Flange 2 is made of Grade 2 pure titanium or pure Nb material. A boss 5 is arranged around the outer side of flange 2. The distance between boss 5 and the upper end of ceramic insulator 1 and the lower end of flange 2 is the same, that is, the distance between boss 5 and the upper surface of ceramic insulator 1 is the same as the distance between boss 5 and the lower surface of flange 2. The width of boss 5 is between 0.5-1.5mm, and the thickness is between 0.3-0.6mm. Boss 5 is placed in the middle of the entire product, which can effectively reduce the residual stress in the weld when it is subsequently welded with the shell of the implant.

[0041] In this embodiment, a support ring 9 is provided at the inner circle of the lower end of the first through hole, the lower end of the ceramic insulator abuts against the upper side of the support ring, the upper end of the ceramic insulator 1 extends out of the upper end of the first through hole, and the height of the upper end of the ceramic insulator 1 extending out of the first through hole is not greater than 1 / 2 of its total height. This structural setting can make the ceramic insulator 1 and the flange 2 firmly connected, and the circumferential size of the ceramic insulator 1 matches the size of the support ring 9. An annular groove 8 is provided on the outer side of the upper end of the first through hole, and the lower end of the annular groove 8 is tilted downward so that the brazing material can fill the annular groove 8 during brazing, so that the ceramic insulator 1 is tightly welded to the flange 2.

[0042] In the embodiment provided by the utility model, a grounding pin 4 is arranged on the outside of the flange 2. The grounding pin 4 is a Pt90Ir10 alloy or a pure Pt wire with a diameter of 0.254mm or 0.381mm. The setting of the grounding pin 4 can ensure the electrical safety of the entire 2-pin ceramic feedthrough connector. When the human body contacts the charged body, an electrostatic discharge phenomenon will occur. The electrostatic charge is transmitted to the 2-pin ceramic feedthrough, which will interfere with the normal transmission of the signal and cause damage to other electronic components of the deep brain stimulator. The 2-pin ceramic feedthrough implanted in the human body is connected to the earth through the grounding pin 4 to form a safe electrical circuit to prevent the accumulation of static electricity and the occurrence of electrical faults. The grounding pin 4 is welded to the outside of the flange 2 by laser spot welding, without the need to open a hole in the ceramic insulator 1. While simplifying the process and reducing costs, the volume of the 2-pin ceramic feedthrough is reduced. At the same time, the position of the grounding pin 4 is relatively flexible and can be set at any position on the outside of the flange 2.

Claims

1. A two-pin ceramic feedthrough for a deep brain stimulator, comprising a ceramic insulator (1), a flange (2), and a probe (3), characterized in that: A first through hole is vertically penetrated in the middle of the flange (2), and the ceramic insulator (1) is located in the first through hole; The ceramic insulator (1) is vertically provided with two second through holes which are probe placement holes (6), and the probes (3) are provided with two and are respectively arranged through the two second through holes; A solder placement hole (7) is provided at one end of each of the two second through holes, and the two solder placement holes (7) are respectively located at different ends of the two second through holes; A grounding pin (4) is arranged on the outer side of the flange (2).

2. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 1, characterized in that: A supporting ring (9) is provided at the inner circle of the lower end of the first through hole, and the lower end of the ceramic insulator abuts against the upper side of the supporting ring.

3. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 2, characterized in that: The upper end of the ceramic insulator (1) extends out of the upper end of the first through hole.

4. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 1, characterized in that: A boss (5) is arranged around the outer side of the flange (2).

5. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 4, characterized in that: The boss (5) is at the same distance from the upper end of the ceramic insulator (1) and the lower end of the flange (2).

6. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 1, characterized in that: The ceramic insulator (1) is a cylindrical structure.

7. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 6, characterized in that: The distances between the two probes (3) and the axis of the ceramic insulator (1) are the same.

8. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 1, characterized in that: The depths of the two solder placement holes (7) are set to be the same.

9. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 3, characterized in that: The height of the upper end of the ceramic insulator (1) extending out of the first through hole is no more than 1 / 2 of its total height.

10. A 2-pin ceramic feedthrough for a deep brain stimulator according to claim 1, characterized in that: An annular groove (8) is provided on the outer side of the upper end of the first through hole, and the lower end of the annular groove (8) is inclined downward.

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