Mainboard fixing structure and finger clip type oximeter

Abstract

The application provides a mainboard fixing structure and a finger clamp type blood oxygen meter, the mainboard fixing structure comprises a mainboard and a shell, the shell is provided with a bridge type hole and a limiting groove at the top end face of the shell in the height direction of the shell, the bridge type hole and the limiting groove are respectively arranged near the two sides of the shell in the length direction of the shell, the first end of the mainboard is detachably inserted into the bridge type hole in the length direction of the shell, the second end of the mainboard is electrically connected with a first conductive sheet, and the insertion end of the first conductive sheet away from the mainboard is detachably inserted into the limiting groove in the height direction of the shell and is used for electrically connecting with one end of a battery. The mainboard fixing structure can reduce the production cost, has a simple and compact structure, is small, exquisite and delicate, and can be maintained and replaced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a motherboard fixing structure and a finger clip pulse oximeter having the motherboard fixing structure. Background Technology

[0002] Finger clip pulse oximeters, a common medical testing device, measure the arterial oxygen saturation of the fingertips by detecting the ratio of the rate of change in absorbance of red and infrared light. Oxygen saturation can effectively assess a patient's lung oxygenation function and the oxygen-carrying capacity of hemoglobin. The light emitter used in finger clip pulse oximeters, capable of emitting both red and infrared light, is a key component and is located on the main board of the device.

[0003] To improve the portability and storage convenience of finger clip pulse oximeters, they need to be small and exquisite, resulting in very compact internal parts assembly space, sometimes even not enough room for a single screw. However, to secure the motherboard within the housing of the finger-clip pulse oximeter, the first existing method involves thermoforming the motherboard into the housing. This involves a plastic pillar in the housing, with the motherboard fitted onto it through mounting holes. The free end of the plastic pillar is then melted and molded into a mushroom-shaped head to secure the motherboard and prevent it from detaching. This method requires thermoforming equipment, skilled operators, and significant energy consumption, increasing production costs. The second method involves adding a fixing frame, which is detachably connected to the housing via clips or other structures, thus confining the motherboard between the frame and the housing. This method requires an additional fixing frame, adding a component and increasing the overall size of the finger-clip pulse oximeter, further increasing production costs. The third method uses adhesive to fix the motherboard to the housing. Once fixed with adhesive, disassembly, maintenance, and replacement are impossible. Summary of the Invention

[0004] To achieve the first objective of this invention, this invention provides a motherboard fixing structure that can reduce production costs, has a simple and compact structure, is small and exquisite in size, and is detachable, maintainable, and replaceable.

[0005] To achieve the second objective of this invention, this invention provides a finger clip pulse oximeter having the aforementioned motherboard fixing structure.

[0006] To achieve the first objective of this invention, the present invention provides a motherboard fixing structure, including a motherboard and a housing. The housing has a bridge-shaped hole and a limiting groove on its top surface in the height direction. The bridge-shaped hole and the limiting groove are respectively located near the two sides of the housing in the length direction. The first end of the motherboard is detachably inserted into the bridge-shaped hole in the length direction of the housing. The second end of the motherboard is electrically connected to a first conductive plate. The insertion end of the first conductive plate away from the motherboard is detachably inserted into the limiting groove in the height direction of the housing and is used for electrical connection with one end of a battery.

[0007] As can be seen from the above scheme, the motherboard fixing structure of the present invention inserts the first end of the motherboard into the bridge-shaped hole in the length direction of the housing, so that the outer peripheral wall of the bridge-shaped hole on the top surface of the housing can restrict the first end of the motherboard in the height direction and the width direction of the housing. At the same time, the outer peripheral wall of the bridge-shaped hole can restrict the side of the housing away from the limiting groove in the length direction. Furthermore, the insertion end of the first conductive piece electrically connected to the second end of the motherboard is inserted into the limiting groove in the height direction of the housing and is used to electrically connect to one end of the battery. Thus, the outer peripheral wall of the limiting groove can restrict the insertion end of the first conductive piece electrically connected to the second end of the motherboard in the length direction of the housing, and at the same time, the outer peripheral wall of the limiting groove can restrict one side of the insertion end of the first conductive piece in the height direction of the housing. Thus, the restricted first conductive piece can force the second end of the motherboard to be restricted on the top surface of the housing, thereby firmly restricting and assembling the entire motherboard to the top surface of the housing. Therefore, the motherboard fixing structure of this invention, by providing bridge-shaped holes and limiting grooves on the top surface of the housing, and by using a first conductive piece for electrical connection with one end of the battery, can securely fix and assemble the entire motherboard onto the top surface of the housing. Compared with the existing method of fixing the motherboard into the housing by hot-melt welding, the motherboard fixing structure of this invention eliminates the hot-melt welding process, thereby eliminating the investment in hot-melt equipment, the power consumption of hot-melt production, and the need for professional operators in hot-melt positions. At the same time, compared with the existing method that requires an additional fixing frame plate, the motherboard fixing structure of this invention does not require additional components. It only needs to provide bridge-shaped holes and limiting grooves on the top surface of the housing, making the housing structure simple, compact, and small in size. The injection molding process allows for the production of housings with bridge-shaped holes and limiting grooves, eliminating difficulties in mold processing and demolding. It adds virtually no cost to existing housing injection molds. Compared to existing dispensing methods for fixing the motherboard to the housing, this invention's motherboard fixing structure features a first end of the motherboard detachably inserted into the bridge-shaped hole along the length of the housing, and a first conductive plate, with its insertion end furthest from the motherboard, detachably inserted into the limiting groove along the height of the housing for electrical connection to one end of the battery. This allows the insertion end of the first conductive plate to be pulled out of the limiting groove, and the first end of the motherboard to be pulled out of the bridge-shaped hole, facilitating motherboard removal from the housing for easy maintenance and replacement. Therefore, this invention's motherboard fixing structure eliminates the need for investment in hot-melt equipment, electricity consumption during hot-melt production, and specialized operators for hot-melt operations, without requiring additional components, thus reducing production costs and giving the product a cost advantage in the market. Furthermore, the motherboard fixing structure is simple, compact, and small in size. The motherboard's detachable mounting on the housing further facilitates maintenance and replacement.

[0008] A further option is to provide a conductive spring at the plug end, and the plug end is electrically connected to the conductive spring. A through groove is provided in the side wall of the housing near the bridge-shaped hole along the length direction of the housing. The end of the conductive spring away from the plug end passes through the through groove in the length direction of the housing and is used to electrically connect with one end of the battery.

[0009] A further embodiment is that the plug end has multiple tilting arms protruding from it. These tilting arms are located inside the coil of the conductive spring and are arranged circumferentially around the coil. The end of each tilting arm away from the plug end extends tilted outward toward the coil. The multiple tilting arms form an annular hook groove between themselves and the wall of the plug end. The end of the conductive spring adjacent to the plug end is embedded in the annular hook groove and makes electrical contact with the tilting arms and the wall of the plug end. Alternatively, the end of the conductive spring adjacent to the plug end is welded to the plug end.

[0010] A further option is to have a first elastic arm protruding from the plug end, the first elastic arm being inclined relative to the height direction of the housing, and the first elastic arm pressing against the side wall of the limiting groove in the length direction of the housing.

[0011] A further option is to have a receiving groove on the top surface of the casing, and the motherboard is embedded in the receiving groove in the height direction of the casing.

[0012] A further embodiment is that the first conductive sheet includes an inclined section and a vertical section connected together. The end of the inclined section away from the vertical section is electrically connected to the second end of the main board. The inclined section extends inclinedly toward the bottom end face of the housing relative to the length direction of the housing. The bottom end face of the housing is positioned opposite to the top end face of the housing in the height direction of the housing. The vertical section is a plug-in end that extends in the height direction of the housing. The vertical section is inserted into the limiting groove and is used to electrically connect with one end of the battery.

[0013] To achieve the second objective of this invention, this invention provides a finger clip pulse oximeter, including a motherboard fixing structure, which is the motherboard fixing structure described above.

[0014] A further design includes a lower finger sleeve on the finger clip pulse oximeter. The lower finger sleeve is set on the top surface of the housing of the main board fixing structure. An avoidance groove is provided on the end face of the lower finger sleeve adjacent to the housing. One end of the bridge-shaped hole of the housing adjacent to the lower finger sleeve is located in the avoidance groove.

[0015] A further design includes a second conductive plate and two batteries in the finger clip pulse oximeter. The main board fixing structure has two first conductive plates and two limiting slots. The two limiting slots are arranged side by side in the width direction of the main board fixing structure housing. One first conductive plate is adapted to one limiting slot and one battery. A positioning slot is opened on the bottom end face of the housing. The second conductive plate is detachably inserted into the positioning slot in the height direction of the housing and electrically connected between the two batteries.

[0016] A further embodiment is that the second conductive sheet has a protruding second elastic arm, which is inclined relative to the height direction of the housing and presses against the side wall of the positioning groove in the length direction of the housing; and / or, the second conductive sheet has two protrusions in the height direction of the housing, which protrude through the positioning groove and press against the other end of the two batteries for electrical contact.

[0017] A further option is that the finger clip pulse oximeter also includes a face cover and an upper finger sleeve. The face cover is hinged to the housing and can be closed on the top surface of the housing. The upper finger sleeve is set on one end of the face cover near the top surface of the housing. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of an embodiment of the finger clip pulse oximeter of the present invention.

[0019] Figure 2 This is a first-view sectional view of an embodiment of the finger clip pulse oximeter of the present invention.

[0020] Figure 3 This is a second-perspective sectional view of an embodiment of the finger clip pulse oximeter of the present invention.

[0021] Figure 4 This is a first-view structural diagram of the motherboard fixing structure in an embodiment of the finger clip pulse oximeter of the present invention.

[0022] Figure 5 This is a second-view structural diagram of the motherboard fixing structure in an embodiment of the finger clip pulse oximeter of the present invention.

[0023] Figure 6 This is a first-view structural diagram of the housing in an embodiment of the finger clip pulse oximeter of the present invention.

[0024] Figure 7 This is a second-view structural diagram of the housing in an embodiment of the finger clip pulse oximeter of the present invention.

[0025] Figure 8 This is a cross-sectional view of the housing in an embodiment of the finger clip pulse oximeter of the present invention.

[0026] Figure 9 This is a third-view structural diagram of the housing in an embodiment of the finger clip pulse oximeter of the present invention.

[0027] Figure 10 This is a structural diagram of the second conductive sheet in an embodiment of the finger clip pulse oximeter of the present invention.

[0028] Figure 11 This is a structural diagram of the main board, the first conductive sheet, and the conductive spring in an embodiment of the finger clip pulse oximeter of the present invention.

[0029] Figure 12This is a structural diagram of the first conductive sheet and the conductive spring in an embodiment of the finger clip pulse oximeter of the present invention.

[0030] Figure 13 This is a cross-sectional view of the first conductive sheet and the conductive spring in an embodiment of the finger clip pulse oximeter of the present invention.

[0031] Figure 14 This is a structural diagram of the first conductive sheet in an embodiment of the finger clip pulse oximeter of the present invention.

[0032] Figure 15 This is a first-view structural diagram of the lower finger sleeve in an embodiment of the finger clip pulse oximeter of the present invention.

[0033] Figure 16 This is a second-view structural diagram of the lower finger sleeve in an embodiment of the finger clip pulse oximeter of the present invention.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0035] See Figures 1 to 16 This embodiment discloses a finger-clip pulse oximeter, including a motherboard fixing structure 16. The motherboard fixing structure 16 includes a motherboard 161 and a housing 164. The housing 164 has a bridge-shaped hole 1641 and a limiting groove 1642 on its top surface in the height direction Z. The bridge-shaped hole 1641 and the limiting groove 1642 are respectively located near both sides of the housing 164 in the length direction X. A first end of the motherboard 161 is detachably inserted into the bridge-shaped hole 1641 in the length direction X of the housing 164. A second end of the motherboard 161 is electrically connected to a first conductive plate 162. The insertion end of the first conductive plate 162, away from the motherboard 161, is detachably inserted into the limiting groove 1642 in the height direction Z of the housing 164 and is used for electrical connection to one end of a battery 17. The light emitter 1611 of the finger-clip pulse oximeter is disposed on the motherboard 161.

[0036] In this embodiment, the mainboard fixing structure 16 of the finger clip pulse oximeter inserts the first end of the mainboard 161 into the bridge-shaped hole 1641 in the length direction X of the housing 164. This allows the outer peripheral wall of the bridge-shaped hole 1641 on the top surface of the housing 164 to restrict the first end of the mainboard 161 in the height direction Z and the width direction Y of the housing 164. Simultaneously, the outer peripheral wall of the bridge-shaped hole 1641 restricts the housing 164 on the side away from the limiting groove 1642 in the length direction X. Furthermore, the insertion end of the first conductive piece 162, which is electrically connected to the second end of the mainboard 161, is located in the height direction X of the housing 164. The limiting groove 1642 is inserted into the Z-axis and used to electrically connect with one end of the battery 17. Thus, the outer peripheral wall of the limiting groove 1642 can restrict the insertion end of the first conductive piece 162 electrically connected to the second end of the main board 161 in the length direction X of the housing 164. At the same time, the outer peripheral wall of the limiting groove 1642 can restrict one side of the insertion end of the first conductive piece 162 in the height direction Z of the housing 164. Thus, the restricted first conductive piece 162 can force the second end of the main board 161 to be restricted on the top surface of the housing 164, thereby firmly restricting the main board 161 to be assembled on the top surface of the housing 164.

[0037] As can be seen, the motherboard fixing structure 16 in this embodiment, by providing a bridge-shaped hole 1641 and a limiting groove 1642 on the top surface of the housing 164, and by using a first conductive piece 162 for electrical connection with one end of the battery 17, can securely fix and assemble the motherboard 161 onto the top surface of the housing 164. Compared with the existing method of fixing the motherboard into the housing by hot melt welding, the motherboard fixing structure 16 in this embodiment eliminates the hot melt welding process, thereby eliminating the need for investment in hot melt equipment, power consumption in hot melt production, and professional operators in the hot melt position. At the same time, compared with the existing method that requires an additional fixing frame plate, the motherboard fixing structure 16 in this embodiment does not require additional parts. It only needs to provide the bridge-shaped hole 1641 and the limiting groove 1642 on the top surface of the housing 164, making the structure of the housing 164 simple, compact, and small in size. The bridge-shaped hole 1641 and the limiting groove 1642 are inserted by injection molding. This method can produce a housing 164 with bridge-shaped holes 1641 and limiting grooves 1642, eliminating the difficulties in mold processing and demolding. There is almost no cost increase on the original injection mold of the housing 164. Compared with the existing dispensing method for fixing the motherboard to the housing, in this embodiment, the first end of the motherboard 161 of the motherboard fixing structure 16 is detachably inserted into the bridge-shaped hole 1641 in the length direction X of the housing 164, and the plug end of the first conductive piece 162 away from the motherboard 161 is detachably inserted into the limiting groove 1642 in the height direction Z of the housing 164 for electrical connection with one end of the battery 17. Thus, the plug end of the first conductive piece 162 can be pulled out from the limiting groove 1642 of the housing 164, and the first end of the motherboard 161 can be pulled out from the bridge-shaped hole 1641 of the housing 164, thereby removing the motherboard 161 from the housing 164 for convenient maintenance and replacement. Therefore, the motherboard fixing structure 16 in this embodiment can eliminate the need for investment in hot-melt equipment, power consumption in hot-melt production, and professional operators in hot-melt positions, and does not require additional parts, thereby reducing production costs and giving the product a cost advantage in market competition. In addition, the motherboard fixing structure 16 in this embodiment has a simple and compact structure and a small and exquisite size. Furthermore, the motherboard 161 of the motherboard fixing structure 16 in this embodiment can be detached and mounted on the housing 164 for easy maintenance and replacement.

[0038] Specifically, in this embodiment, a battery compartment 1646 is provided on the bottom end face of the housing 164, and the battery 17 is detachably placed in the battery compartment 1646. The bottom end face of the housing 164 is positioned opposite to the top end face of the housing 164 in the height direction Z. Furthermore, the finger clip pulse oximeter in this embodiment also includes a battery cover 18, which is detachably connected to the housing 164 by a snap-fit ​​and covers the opening of the battery compartment 1646.

[0039] To ensure a tight electrical connection between the insertion end of the first conductive piece 162 and one end of the battery 17, a conductive spring 163 is provided at the insertion end of the first conductive piece 162 in this embodiment, and the insertion end of the first conductive piece 162 is electrically connected to the conductive spring 163. A through groove (not shown) is provided through the side wall of the housing 164 near the bridge-shaped hole 1641 in the length direction X. The end of the conductive spring 163 away from the insertion end passes through the through groove in the length direction X of the housing 164 and is used to electrically connect with one end of the battery 17. Thus, the elastic compression force of the conductive spring 163 enables the battery 17 to obtain a tight electrical connection, which plays a good conductive role.

[0040] In this embodiment, one end of the conductive spring 163 adjacent to the plug-in end can be welded to the plug-in end. Furthermore, in this embodiment, the plug-in end of the first conductive sheet 162 protrudes and is provided with multiple inclined arms 16222. These inclined arms 16222 are located inside the spring coil of the conductive spring 163 and arranged circumferentially around the spring coil. The end of each inclined arm 16222 away from the plug-in end of the first conductive sheet 162 extends obliquely outwards towards the spring coil of the conductive spring 163. An annular hook groove (not shown) is formed between the multiple inclined arms 16222 and the wall surface of the plug-in end of the first conductive sheet 162. One end of the spring coil connected to the insertion end of the first conductive piece 162 is embedded in the annular hook groove and makes electrical contact with the wall surface of the inclined arm 16222 and the insertion end of the first conductive piece 162. This ensures that one end of the conductive spring 163 adjacent to the first conductive piece 162 is firmly embedded in the annular hook groove formed between the insertion end of the first conductive piece 162 and the plurality of inclined arms 16222, and the electrical contact between the end of the conductive spring 163 adjacent to the first conductive piece 162 and the wall surface of the inclined arm 16222 and the insertion end is tight, thereby improving conductivity. Furthermore, in this embodiment, the connection end of the first conductive piece 162 is welded to the second end of the main board 161 by welding.

[0041] To improve the stability of the fit between the insertion end of the first conductive sheet 162 and the limiting groove 1642, in this embodiment, the insertion end of the first conductive sheet 162 is provided with a first elastic arm 16221. The first elastic arm 16221 is inclined relative to the height direction Z of the housing 164, and the first elastic arm 16221 presses against the side wall of the limiting groove 1642 in the length direction X of the housing 164, thereby making the insertion end of the first conductive sheet 162 stably held in the limiting groove 1642. Furthermore, since the first elastic arm 16221 has elastic deformation capability, it is also convenient for the insertion end of the first conductive sheet 162 to be pulled out from the limiting groove 1642.

[0042] To further improve the stability of the fit between the insertion end of the first conductive piece 162 and the limiting groove 1642, and to enhance the aesthetic appearance of the finger clip pulse oximeter, this embodiment of the finger clip pulse oximeter also includes a decorative cover 19. The decorative cover 19 is detachably connected to the housing 164 by a snap fastener, and the decorative cover 19 can cover the top surface of the housing 164 and press against the top of the first conductive piece 162 in the height direction Z of the housing 164, thereby making the insertion end of the first conductive piece 162 stably held in the limiting groove 1642, and thus making the main board 161 stably and securely assembled on the top surface of the housing 164.

[0043] To further simplify the structure of the motherboard fixing structure 16 and make it small and exquisite, the top surface of the housing 164 in this embodiment is provided with a receiving groove 1643. The motherboard 161 is embedded in the receiving groove 1643 in the height direction Z of the housing 164, so that the motherboard 161 is stably embedded in the top surface of the housing 164, thereby reducing the overall volume of the motherboard fixing structure 16.

[0044] In addition, the first conductive sheet 162 in this embodiment includes an inclined section 1621 and a vertical section 1622 connected to each other. The end of the inclined section 1621 away from the vertical section 1622 is electrically connected to the second end of the main board 161 by welding. The inclined section 1621 extends inclinedly towards the bottom surface of the housing 164 in the length direction X relative to the housing 164. The bottom surface of the housing 164 is opposite to the top surface of the housing 164 in the height direction Z. The vertical section 1622 is a plug-in end and extends in the height direction Z of the housing 164. The vertical section 1622 is inserted into the limiting groove 1642 and is used to electrically connect with one end of the battery 17. Therefore, in this embodiment, the first conductive sheet 162 includes an inclined section 1621 and a vertical section 1622 connected to each other. The inclined section 1621 extends inclinedly toward the bottom surface of the housing 164 in the length direction X relative to the housing 164, and the vertical section 1622 extends in the height direction Z of the housing 164. This makes the first conductive sheet 162 have a certain elastic deformation capability, which facilitates the operation of inserting or pulling out the vertical section 1622 of the first conductive sheet 162 into the limiting groove 1642.

[0045] Furthermore, this embodiment of the finger clip pulse oximeter also includes a face cover 11, an upper finger sleeve 12, and a lower finger sleeve 13. The lower finger sleeve 13 is disposed on the top surface of the housing 164 of the main board fixing structure 16. The lower finger sleeve 13 has a through groove 131 corresponding to the light emitter 1611, and an avoidance groove 132 is provided on the end face of the lower finger sleeve 13 adjacent to the housing 164. One end of the bridge-shaped hole 1641 of the housing 164 adjacent to the lower finger sleeve 13 is located in the avoidance groove 132, making the structure compact and reducing the overall height of the finger clip pulse oximeter in the height direction Z of the housing 164, thereby reducing the overall volume of the finger clip pulse oximeter. In this embodiment, the face cover 11 is hinged to the housing 164 and can be closed on the top surface of the housing 164. The upper finger sleeve 12 is disposed on the end face of the face cover 11 near the top surface of the housing 164, so that the upper finger sleeve 12 and the lower finger sleeve 13 can be clamped on the outer periphery of the fingertip. In this embodiment, both the upper finger sleeve 12 and the lower finger sleeve 13 are made of silicone. Specifically, the top surface of the housing 164 in this embodiment is provided with two pivots 1644. The two pivots 1644 are respectively located near the two sides of the housing 164 in the width direction Y. The face cover 11 is respectively hinged to the two pivots 1644 through two hinge holes (not shown). Each pivot 1644 is also fitted with a torsion spring 14. The first torsion arm of the torsion spring 14 is hooked on the face cover 11, and the second torsion arm of the torsion spring 14 is hooked on the housing 164, thereby forcing the face cover 11 and the housing 164 to move toward each other.

[0046] To ensure the working power of the finger clip pulse oximeter, the number of batteries 17 in this embodiment is two. Correspondingly, the number of first conductive plates 162, limiting grooves 1642, and conductive springs 163 in the main board fixing structure 16 in this embodiment are all two. The two limiting grooves 1642 are arranged side by side in the width direction Y of the housing 164 of the main board fixing structure 16. One first conductive plate 162 is adapted to one limiting groove 1642, one conductive spring 163, and one battery 17.

[0047] In order to connect the two batteries 17 in series, the finger clip pulse oximeter in this embodiment also includes a second conductive sheet 15. A positioning groove 1645 is provided on the bottom end face of the housing 164. The second conductive sheet 15 is detachably inserted into the positioning groove 1645 in the height direction Z of the housing 164 and electrically connected between the two batteries 17.

[0048] To improve the stability of the fit between the second conductive sheet 15 and the positioning groove 1645, in this embodiment, the second conductive sheet 15 is provided with a protruding second elastic arm 152. The second elastic arm 152 is inclined relative to the height direction Z of the housing 164, and the second elastic arm 152 presses against the side wall of the positioning groove 1645 in the length direction X of the housing 164, thereby making the second conductive sheet 15 stably held in the positioning groove 1645. Furthermore, due to the elastic deformation capability of the second elastic arm 152, it is also convenient for the second conductive sheet 15 to be pulled out of the positioning groove 1645. In addition, to ensure that the second conductive sheet 15 forms a tight electrical contact with the battery 17, in this embodiment, the second conductive sheet 15 has two protrusions 151 protruding in the height direction Z of the housing 164. The two protrusions 151 respectively extend through the positioning groove 1645 in the height direction Z of the housing 164 and press against the other end of the two batteries 17 for electrical contact.

[0049] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. A motherboard fixing structure, comprising a motherboard and a housing, characterized in that: The housing has a bridge-shaped hole and a limiting groove on its top surface in the height direction, and the bridge-shaped hole and the limiting groove are respectively located close to both sides of the housing in the length direction. The first end of the main board is detachably inserted into the bridge-shaped hole in the length direction of the housing, and the second end of the main board is electrically connected to a first conductive plate. The plug end of the first conductive plate away from the main board is detachably inserted into the limiting groove in the height direction of the housing and is used to electrically connect to one end of the battery. The plug end is provided with a conductive spring, and the plug end is electrically connected to the conductive spring. The limiting groove is provided with a through groove in the side wall of the housing near the bridge-shaped hole in the length direction of the housing. The end of the conductive spring away from the plug end passes through the through groove in the length direction of the housing and is used to electrically connect with one end of the battery. The plug end is provided with a plurality of inclined arms, which are located inside the coil of the conductive spring and arranged circumferentially on the coil. The end of each inclined arm away from the plug end extends inclinedly outward toward the coil. The plurality of inclined arms form an annular hook groove between the wall of the plug end and the wall of the plug end. The end of the conductive spring adjacent to the plug end is embedded in the annular hook groove and makes electrical contact between the inclined arms and the wall of the plug end.

2. The motherboard fixing structure according to claim 1, characterized in that: The plug end is provided with a first elastic arm, which is inclined relative to the height direction of the housing and presses against the side wall of the limiting groove in the length direction of the housing.

3. The motherboard fixing structure according to claim 1, characterized in that: The top surface of the housing has a receiving groove, and the motherboard is embedded in the receiving groove in the height direction of the housing.

4. The motherboard fixing structure according to any one of claims 1 to 3, characterized in that: The first conductive sheet includes an inclined section and a vertical section connected to each other. One end of the inclined section away from the vertical section is electrically connected to the second end of the main board. The inclined section extends inclinedly toward the bottom end face of the housing relative to the length direction of the housing. The bottom end face of the housing is disposed opposite to the top end face of the housing in the height direction of the housing. The vertical section is the plug-in end and extends in the height direction of the housing. The vertical section is inserted into the limiting groove and is used for electrical connection with one end of the battery.

5. A finger clip pulse oximeter, including a motherboard fixing structure, characterized in that: The motherboard fixing structure is the motherboard fixing structure as described in any one of claims 1 to 4.

6. The finger clip pulse oximeter according to claim 5, characterized in that: The finger clip pulse oximeter also includes a lower finger sleeve, which is disposed on the top surface of the housing of the main board fixing structure. An avoidance groove is provided on the end face of the lower finger sleeve adjacent to the housing, and one end of the bridge-shaped hole of the housing adjacent to the lower finger sleeve is located in the avoidance groove.

7. The finger clip pulse oximeter according to claim 5, characterized in that: The finger clip pulse oximeter also includes a second conductive sheet and two batteries. The number of the first conductive sheet and the limiting groove of the main board fixing structure are both two. The two limiting grooves are arranged side by side in the width direction of the housing of the main board fixing structure. One first conductive sheet is adapted to one limiting groove and one battery. The bottom surface of the housing is provided with a positioning groove, and the second conductive sheet is detachably inserted into the positioning groove in the height direction of the housing and electrically connected between the two batteries.

8. The finger clip pulse oximeter according to claim 7, characterized in that: The second conductive sheet has a protruding second elastic arm, which is inclined relative to the height direction of the housing and presses against the side wall of the positioning groove in the length direction of the housing. And / or, the second conductive sheet protrudes two protrusions in the height direction of the housing, and the two protrusions respectively pass through the positioning groove in the height direction of the housing and press against the other end of the two batteries for electrical contact.

9. The finger clip pulse oximeter according to any one of claims 5 to 8, characterized in that: The finger clip pulse oximeter also includes a face cover and an upper finger sleeve. The face cover is hinged to the housing and can cover the top surface of the housing. The upper finger sleeve is disposed on one end of the face cover near the top surface of the housing.

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