Ground wire structure of circuit board of medical instrument and endoscope comprising ground wire structure

Abstract

The ground wire structure of the circuit board of the medical instrument comprises a PCB hard board, the PCB hard board is formed by stacking a plurality of signal layers and ground wire layers, conductive areas of the ground wire layers are distributed on the whole board surface of the PCB hard board, and the positions, corresponding to the circumferential side edges of the PCB hard board, of the ground wire layers are all covered by the conductive areas. The FPC soft board is connected with the PCB hard board, a ground wire lead is arranged on the FPC soft board, one end of the ground wire lead is electrically connected with the ground wire layer, and the other end of the ground wire lead extends to one side, far away from the PCB hard board, of the FPC soft board. The conductive area of the ground wire layer is fully distributed on the whole board, and the circumferential side edge of the ground wire layer is also covered by the conductive area, so that static electricity can be effectively guided to flow along the ground wire layer, and electronic sensitive elements on the PCB are prevented from being damaged by the static electricity.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of medical instrument circuit board ground wire structure and endoscope containing the ground wire structure of this ground wire structure. BACKGROUND

[0002] In the use process of medical instrument, there can be multiple factors leading to the generation of static electricity, including but not limited to:

[0003] 1. Human activity: During human activity, especially when wearing clothes made of certain materials, static electricity may be generated and accumulated. When the human body contacts the medical instrument, these static electricity may discharge, affecting the normal operation of the equipment.

[0004] 2. Equipment materials: The materials used in medical instruments, especially insulating materials, may generate static electricity during friction or contact.

[0005] 3. Environmental conditions: Dry environments are more likely to generate static electricity, as static electricity is less likely to dissipate through air conduction when humidity is low.

[0006] 4. Device design: If the design of the medical instrument does not take into account the protection against static discharge, such as lack of adequate grounding or shielding measures, the device may be more susceptible to static electricity.

[0007] 5. Operator behavior: If the operator does not take appropriate anti-static measures when operating the medical instrument, static electricity may be introduced.

[0008] The damage of static electricity to medical instruments may include:

[0009] 1. Hardware damage: Static discharge may directly damage sensitive electronic components, such as semiconductor devices, causing permanent failure of the equipment.

[0010] 2. Performance interference: The electromagnetic field changes caused by static discharge may interfere with the normal operation of the equipment, causing the equipment to malfunction or display abnormally.

[0011] 3. Data loss: In some cases, static discharge may cause loss or error of equipment data, affecting the accuracy of diagnosis or treatment.

[0012] Reference Figure 1 In existing medical instrument circuit boards, the PCB hard board 1 is composed of a plurality of signal layers 11 and ground layers 12, and the ground layers 12 are generally not fully distributed on the entire surface of the PCB hard board 1, leaving a certain discharge distance n between the ground layers 12 and the board edge. The working principle of the ground wire is to provide a low-impedance path to safely conduct ESD energy to the ground. If there is a certain discharge distance n between the ground layer 12 and the board edge, the impedance of this path will increase, thereby reducing the ESD protection effect. Utility Model Content

[0013] The first technical problem to be solved by this utility model is to provide a ground wire structure for a medical device circuit board, wherein the conductive area of ​​the ground wire layer covers the entire board, and the circumferential side of the ground wire layer is also covered by the conductive area, which can effectively guide static electricity to flow along the ground wire layer, thereby protecting the electronic sensitive components on the PCB board from electrostatic damage.

[0014] The second technical problem to be solved by this utility model is to provide an endoscope containing the above-mentioned medical device circuit board ground wire structure, which has a reasonable structural design, high reliability, is easy to process and automate production, and has strong anti-interference ability during use.

[0015] To solve the first technical problem mentioned above, this utility model provides a circuit board ground structure suitable for medical devices, including a PCB rigid board. The PCB rigid board is composed of several signal layers and ground layers stacked together. The conductive area of ​​the ground layer covers the entire surface of the PCB rigid board, and the circumferential side of the PCB rigid board corresponding to the location of the ground layer is covered by the conductive area.

[0016] Preferably, the system also includes an FPC flexible board connected to the PCB rigid board. The FPC flexible board has a ground lead, one end of which is electrically connected to the ground layer, and the other end of which extends to the side of the FPC flexible board away from the PCB rigid board.

[0017] For the sake of simplicity, the ground wire structure of the medical device circuit board described in this utility model will be referred to as the local ground wire structure.

[0018] Advantages of the local ground plane structure: In the local ground plane structure, the conductive area of ​​the ground plane layer covers the entire surface of the PCB rigid board, with its edges extending to the edge of the PCB board, forming the boundary of the maximum outline. Furthermore, the circumferential sides of the ground plane layer are also covered by the conductive area. During use, the circumferential sidewalls of the PCB rigid board are in contact with the outer casing of the medical device. Using this PCB ground plane structure can effectively conduct static electricity on the outer casing to the ground through the ground plane layer, thereby protecting the electronically sensitive components on the PCB from electrostatic damage.

[0019] To solve the second technical problem mentioned above, this utility model provides an endoscope with a medical device circuit board ground wire structure, including a front end shell and a snake-bone tube arranged front to back and connected end to end. The rear side of the front end shell is open, and the front part of the front end shell is provided with a lens hole, a light source hole and an instrument channel. The rear part inside the front end shell is provided with a first PCB board arranged vertically with its normal direction running front to back. The front side of the first PCB board is mounted with a lens assembly and several light source assemblies using SMT. The lens assembly and the light source assembly are respectively directly opposite the lens hole and the light source hole. The rear side of the first PCB board is provided with a horizontally arranged FPC flexible board with its length direction running front to back. The FPC flexible board is located inside the snake-bone tube. The front side of the FPC flexible board is bent at 90° and connected to the first PCB board through a cover. A second PCB board that matches the FPC flexible board is attached near the rear side of the FPC flexible board. The second PCB board is connected to a signal adapter board through a male and female connector socket. The first PCB board is composed of several signal layers and ground layers stacked together. The conductive area of ​​the ground layer covers the entire surface of the first PCB board, and the ground layer is covered by the conductive area at the corresponding circumferential side of the first PCB board. The circumferential edge of the first PCB board is in contact with the inner wall of the tip shell. The FPC flexible board is provided with a ground lead. One end of the ground lead is electrically connected to the ground layer, and the other end of the ground lead extends to the side of the FPC flexible board away from the first PCB board.

[0020] For the sake of simplicity, the endoscope containing a medical device circuit board ground wire structure described in this utility model will be referred to as this endoscope.

[0021] Advantages of this endoscope: This endoscope adopts SMT surface mount technology, integrating the lens assembly and light source assembly onto the PCB board for high-density, high-precision integration. This replaces manual soldering, reducing human error and significantly improving the overall reliability of the endoscope. The connection between the FPC flexible board and the first PCB board (rigid PCB) uses a flip-top design, where the FPC flexible board is bent in the flip-top area and then concealed inside the rigid PCB board, leaving space for the conduit and preventing the FPC from being squeezed at the bend and breaking the internal conductive layer. The signal adapter board is connected to the second PCB board using a male-female connector, allowing for front-end assembly first, followed by connection of the signal adapter board, facilitating endoscope production and assembly. The ground plane extends to the circumferential edge of the first PCB board. Since the circumferential edge of the first PCB board contacts the inner wall of the tip shell, the ground plane of the first PCB board is conductive to the tip shell. External electrostatic discharge (ESD) can be directly conducted away through the ground plane, protecting the internal optoelectronic components.

[0022] To achieve better results with this endoscope, the preferred solution is as follows:

[0023] Preferably, a filler strip running in a left-right direction is provided on the rear side of the first PCB board corresponding to the inner corner of the FPC flexible board bend. The inner corner of the FPC flexible board bend is in close contact with the filler strip, and both ends of the filler strip are flush with the left and right edges of the FPC board. The circumferential side of the filler strip is provided with an arc-shaped chamfer at the contact point with the inner corner of the FPC flexible board bend.

[0024] Preferably, the filler strip has a circular cross-section.

[0025] The filler strip is placed at the inner corner of the FPC flexible board bend. The arc-shaped structure ensures that the inner corner of the FPC flexible board bend remains rounded, avoiding sharp corners that could break the internal conductive layer of the FPC flexible board. The filler strip can be made of polymer resin molding materials (such as PC, ABS, acrylic glue, epoxy glue, silicone, etc.) or hard metal molding materials (such as stainless steel, etc.). In addition, the filler strip can also be in the shape of an integral cylinder, so the contact surface with the FPC flexible board will necessarily be arc-shaped.

[0026] Preferably, a sealant strip is provided at the gap between the rear side of the first PCB board and the outer corner of the FPC board.

[0027] The sealant strip prevents the FPC flexible sheet from elastically returning to its original position. At the same time, the FPC flexible sheet is sandwiched between the sealant strip and the filler strip at the bending part, which also protects the structure of the bending part of the FPC flexible sheet.

[0028] Preferably, the FPC flexible board is fitted with a protective tube on its outer circumferential side.

[0029] The protective tube provides electrostatic, pressure-resistant, sealing, and abrasion-resistant protection, reducing wear on the FPC flexible circuit board during use and ensuring clinical safety and image transmission stability.

[0030] Preferably, the first PCB board has a recess at the position corresponding to the opening of the instrument channel in the front shell, and the depth of the recess matches the opening area.

[0031] The recess in the first PCB board serves to make way, leaving sufficient space for the instrument channel to facilitate clinical operation. In addition, the depth of the recess will not affect the opening area, meaning that the normal use of the instrument channel will not affect the mechanical strength of the connection between the FPC flexible board and the first PCB board. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the ground wire structure in an existing medical device circuit board.

[0033] Figure 2 This is a plan view of the local line structure.

[0034] Figure 3 It is a 3D diagram of the local line structure.

[0035] Figure 4 This is a schematic diagram of the local line structure in use.

[0036] Figure 5 This is an exploded view of the structure of this endoscope.

[0037] Figure 6 This is a schematic diagram of the internal structure of this endoscope (the tip shell, snake-bone tube, protective tube, and signal adapter plate are not shown).

[0038] Figure 7 This is a cross-sectional view of the structure at the bend of the FPC flexible plate of this endoscope.

[0039] Figure 8 This is another schematic diagram of the internal structure of this endoscope (the tip shell, snake-bone tube, and signal adapter plate are not shown).

[0040] Figure 9 This is a plan view of the ground plane structure in this endoscope.

[0041] Figure 10 This is a three-dimensional diagram of the ground plane structure in this endoscope.

[0042] Figure 11 This is a schematic diagram illustrating the usage principle of the grounding structure in this endoscope. Detailed Implementation

[0043] Example 1:

[0044] See Figures 2-4 A circuit board ground structure suitable for medical devices includes a PCB rigid board 1, which is composed of several signal layers 11 and ground layers 12 stacked together. The conductive area of ​​the ground layer 12 covers the entire surface of the PCB rigid board 1, and the circumferential side of the PCB rigid board 1 at the location of the ground layer 12 is covered by the conductive area.

[0045] Preferably, the system also includes an FPC flexible board 2 connected to the PCB rigid board 1. The FPC flexible board 2 is provided with a ground lead 21. One end of the ground lead 21 is electrically connected to the ground layer 12, and the other end of the ground lead 21 extends to the side of the FPC flexible board 2 away from the PCB rigid board.

[0046] Advantages of the ground plane structure: The conductive area of ​​the ground plane layer 12 covers the entire surface of the PCB rigid board 1, and its edge extends to the edge of the PCB rigid board 1, forming the boundary of the maximum outline. Moreover, the circumferential sidewalls of the ground plane layer 12 are also covered by conductive areas. During use, the circumferential sidewalls of the PCB rigid board 1 are in contact with the outer shell 3 of the medical device. This circuit board ground structure can effectively conduct static electricity on the outer shell 3 to the ground through the ground plane layer 12, thereby protecting the electronically sensitive components on the circuit board from electrostatic damage.

[0047] Example 2:

[0048] See Figures 5-11 An endoscope includes a front-end shell 1 and a snake-bone tube 3 arranged front to back and connected end to end. The rear side of the front-end shell 1 is open, and the front part of the front-end shell 1 is provided with a lens hole, a light source hole, and an instrument channel. The rear part inside the front-end shell 1 is provided with a first PCB board 2 arranged vertically with its normal direction running front to back. The front side of the first PCB board 2 is surface-mounted with a lens assembly 21 and two light source assemblies 22. (The lens assembly 21 generally includes a lens and an image sensor, which are either an integral structure or separate structures. The shape can be round, square, or other shapes. It is a mature technology in this field. For simplicity, it is described as lens assembly 21 in this embodiment.) The lens assembly 21 and the light source assembly 22 are respectively directly opposite the lens hole and the light source hole (the light source hole is generally a blind hole through which light passes). (The thin-walled end shell illuminates the target being photographed). The rear side of the first PCB board 2 is provided with a horizontally arranged FPC flexible board 4 with a front-to-back orientation along its length. The FPC flexible board 4 is located inside the snake tube 3. The front side of the FPC flexible board 4 is bent at 90° and connected to the first PCB board 2 through a cover. A second PCB board 42 matching the FPC flexible board 4 is attached near the rear side of the FPC flexible board 4. The second PCB board 42 is connected to a signal adapter board 5 through a male and female connector socket. In the attached figure, part 421 is the connector plug, i.e., the male head, and part 51 is the connector socket, i.e., the female head. (It should be noted that both the snake tube and the FPC flexible board can be bent. In this embodiment, they are described in a horizontal and front-to-back orientation to facilitate the representation of the positional relationship of each component. It can only represent one state.) The first PCB board 2 is composed of several signal layers and ground layers 26 stacked together. The conductive area of ​​the ground layer 26 covers the entire surface of the first PCB board 2, and the circumferential side of the first PCB board is covered by the conductive area at the position of the ground layer 26. The circumferential edge of the first PCB board is in contact with the inner wall of the tip shell. The FPC flexible board is provided with ground leads. One end of the ground lead is electrically connected to the ground layer, and the other end of the ground lead extends to the side of the FPC flexible board away from the first PCB board.

[0049] A left-right oriented filler strip 24 is provided on the rear side of the first PCB board 2, corresponding to the inner corner of the FPC flexible board 4 bend. The inner corner of the FPC flexible board 4 bend is in close contact with the filler strip 24. Both ends of the filler strip 24 are flush with the left and right edges of the FPC flexible board 4. The circumferential side of the filler strip 24 is provided with an arc-shaped chamfer at the contact point with the inner corner of the FPC flexible board 4 bend.

[0050] A sealant strip 25 is provided in the gap between the rear side of the first PCB board 2 and the outer corner of the FPC board bend.

[0051] The FPC flexible board is fitted with a protective tube 41 around its outer perimeter.

[0052] The first PCB board 2 is composed of several signal layers 261 and ground layers 26 stacked together. The conductive area of ​​the ground layer 26 covers the entire surface of the first PCB board 2, and the circumferential side of the first PCB board 2 is covered by the conductive area at the position of the ground layer 26. The circumferential edge of the first PCB board 2 is in contact with the inner wall of the tip shell 1. The FPC flexible board 4 is provided with a ground lead 43. One end of the ground lead 43 is electrically connected to the ground layer 26, and the other end of the ground lead 43 extends to the side of the FPC flexible board 4 away from the first PCB board 2.

[0053] The first PCB board 2 has a recess 23 at the corresponding instrument channel opening of the front shell 1, and the depth of the recess 23 matches the opening area.

[0054] Advantages of this endoscope: This endoscope adopts SMT surface mount technology, mounting the lens assembly 21 and the light source assembly 22 onto the PCB board to achieve high-density, high-precision integration, replacing manual soldering and reducing human error, thereby greatly improving the overall reliability of the endoscope. The connection between the FPC flexible board 4 and the first PCB board 2 adopts a flip-top design, that is, the FPC flexible board 4 is bent in the flip-top area, and after bending, the FPC is hidden inside the rigid PCB board, leaving room for the conduit and preventing the FPC from being squeezed at the bend and breaking the internal conductive layer. The signal adapter board 5 is connected to the second PCB board 42 using a male and female connector socket, which allows for front-end assembly first, and then connection of the signal adapter board 5 last, facilitating the production and assembly of the endoscope.

[0055] The filler strip 24 is placed at the inner corner of the FPC flexible board 4 bend. The arc-shaped structure can ensure that the inner corner of the FPC flexible board 4 bend remains arc-shaped, avoiding sharp corners from breaking the internal conductive layer of the FPC flexible board 4. The filler strip 24 can be made of polymer resin molding material (such as PC, ABS, acrylic glue, epoxy glue, silicone, etc.) or hard metal molding material (such as stainless steel, etc.). In addition, the shape of the filler strip 24 can also be an integral cylinder, so the contact surface with the FPC flexible board 4 must be arc-shaped.

[0056] The sealant strip 25 can prevent the FPC flexible board 4 from elastically returning to its original position. At the same time, the bent part of the FPC flexible board 4 is sandwiched between the sealant strip 25 and the filler strip 24, which also protects the structure of the bent part of the FPC flexible board 4. The sealant strip 25 can be made of acrylic, such as UV glue, or low-temperature epoxy glue, or silicone moisture-curing glue.

[0057] The protective tube 41 has the functions of static electricity protection, pressure resistance, sealing and wear resistance protection, which can reduce the wear of FPC flexible board 4 during use and ensure clinical safety and image transmission stability.

[0058] The ground layer 26 extends to the circumferential edge of the first PCB board 2. Since the circumferential edge of the first PCB board 2 is in contact with the inner wall of the tip shell 1, the ground line of the first PCB board 2 is connected to the tip shell 1. External electrostatic discharge through the thin wall can be directly conducted away through the ground line, protecting the internal optoelectronic devices.

[0059] The recess 23 of the first PCB board 2 serves to make way, leaving enough space for the instrument channel to facilitate clinical operation. In addition, the depth of the recess 23 will not affect the opening area, that is, the normal use of the instrument channel will not affect the mechanical strength of the connection between the FPC flexible board 4 and the first PCB board 2.

[0060] In the above embodiments: both the snake-bone tube and the FPC flexible board are bendable. In this embodiment, the horizontal orientation is only for the convenience of structural description.

Claims

1. A ground wire structure for a medical device circuit board, characterized in that: The PCB rigid board is composed of several signal layers and ground layers stacked together. The conductive area of ​​the ground layer covers the entire surface of the PCB rigid board, and the circumferential side of the PCB rigid board corresponding to the ground layer position is covered by the conductive area.

2. The ground wire structure of a medical device circuit board according to claim 1, characterized in that: It also includes an FPC flexible board connected to the PCB rigid board. The FPC flexible board has a ground lead, one end of which is electrically connected to the ground layer, and the other end of which extends to the side of the FPC flexible board away from the PCB rigid board.

3. An endoscope comprising the grounding structure as described in any one of claims 1 or 2, characterized in that: The system includes a front-end shell and a snake-bone tube arranged end-to-end. The rear of the front-end shell is open, and the front of the front-end shell has a lens hole, a light source hole, and an instrument passage. Inside the rear of the front-end shell is a vertically arranged first PCB board with its normal direction running front-to-back. The front of the first PCB board is surface-mounted with a lens assembly and several light source assemblies, which are directly opposite the lens hole and light source hole, respectively. The rear of the first PCB board has a horizontally arranged FPC flexible board with its length running front-to-back. The FPC flexible board is located inside the snake-bone tube, and its front side is bent at 90° and connected to the first PCB board through a cover. A second PCB board matching the FPC flexible board is attached near the rear side of the board. The second PCB board is connected to a signal adapter board via a male and female connector socket. The first PCB board is composed of several signal layers and ground layers stacked together. The conductive area of ​​the ground layer covers the entire surface of the first PCB board, and the circumferential side of the first PCB board is covered by the conductive area at the ground layer position. The circumferential edge of the first PCB board is in contact with the inner wall of the tip shell. The FPC flexible board is provided with a ground lead. One end of the ground lead is electrically connected to the ground layer, and the other end of the ground lead extends to the side of the FPC flexible board away from the first PCB board.

4. An endoscope with a medical device circuit board ground wire structure according to claim 3, characterized in that: A filler strip running in a left-right direction is provided on the rear side of the first PCB board at the inner corner of the FPC flexible board bend, and the inner corner of the FPC flexible board bend is in close contact with the filler strip.

5. An endoscope containing a medical device circuit board ground wire structure according to claim 4, characterized in that: Both ends of the filler strip are flush with the left and right edges of the FPC board.

6. An endoscope with a medical device circuit board ground wire structure according to claim 4, characterized in that: The circumferential side of the filler strip has a rounded chamfer at the contact point with the inner corner of the FPC flexible board bend.

7. An endoscope with a medical device circuit board ground wire structure according to claim 4, characterized in that: The filler strip has a circular cross-section.

8. An endoscope with a medical device circuit board ground wire structure according to claim 3, characterized in that: A sealant strip is provided in the gap between the rear side of the first PCB board and the outer corner of the FPC board.

9. An endoscope with a medical device circuit board ground wire structure according to claim 3, characterized in that: The FPC flexible board is fitted with a protective tube around its outer periphery.

10. An endoscope with a medical device circuit board ground wire structure according to claim 3, characterized in that: The first PCB board has a recess at the position corresponding to the opening of the instrument channel in the front shell, and the depth of the recess matches the opening area.

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