Airway secretion removing device for ICU (Intensive Care Unit)

Abstract

The invention discloses an airway secretion removal device for an ICU (intensive care unit), belongs to the technical field of airway secretion removal, and aims to solve the problem that friction is extremely easy to generate between a suction probe and the inner wall of an airway of a patient when the suction probe is inserted into and pulled out of the airway of the patient due to the fact that the suction probe needs to be close to the inner wall of the airway of the patient. A suction probe is clamped in an inner cavity of the front end of the second connecting sleeve in a sealed mode, an air bag is embedded in the periphery of the suction probe, a plurality of air bag holes are formed in the air bag, and hollow lubricating balls are connected to the positions, close to outer end openings, of the air bag holes through thin lines. In the process that a medical worker inserts the suction probe, the air bag and the hose into the airway of a patient, the outer diameter of the suction probe can be greatly reduced during insertion through the arrangement that the air bag is stored in the annular groove, the suction probe can be more conveniently inserted into the airway of the patient, and meanwhile damage to the inner wall of the airway of the patient can be greatly reduced; and the smoothness and the safety of intubation operation are improved.

Description

Technical Field

[0001] This invention relates to the field of airway secretion removal technology, specifically to an airway secretion removal device for ICU use. Background Technology

[0002] The ICU mainly admits critically ill patients who have undergone endotracheal intubation, tracheotomy, or respiratory failure. These patients have impaired natural airway humidification and ciliary clearance functions, and airway secretions are prone to accumulate, become thick and crusty. This not only increases airway resistance and obstructs ventilation, but also easily breeds bacteria, inducing serious complications such as ventilator-associated pneumonia. In some cases, suffocation may even occur due to airway obstruction caused by sputum crusts, seriously threatening the patient's life and affecting prognosis.

[0003] Currently, commonly used airway secretion removal devices in clinical practice clear airway secretions from patients. The removal method mainly involves inserting a suction probe and tubing into the patient's airway and using the negative pressure generated by a pump to draw out the secretions through the holes in the suction probe. However, in actual use, because the suction probe needs to be close to the inner wall of the patient's airway to ensure good suction of secretions, it is extremely easy for the suction probe to rub against the inner wall of the patient's airway when it is inserted and removed. This can cause airway mucosal damage, bleeding, and even mucosal edema and inflammatory reactions, aggravating the patient's airway irritation and discomfort. At the same time, the damaged airway mucosal barrier function decreases, which further increases the risk of bacterial infection and is not conducive to the patient's airway recovery.

[0004] To address the above issues, an airway secretion clearance device for ICU use is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an airway secretion removal device for ICU use. By using this device, the problem mentioned above is solved, which is that when the suction probe is inserted into or removed from the patient's airway, it is extremely easy for friction to occur between the suction probe and the patient's airway wall.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an airway secretion removal device for ICU use, comprising a bidirectional pump and a rigid tube fixedly installed at the output and input ports of the bidirectional pump. A collection tank is fixedly connected to the bottom of the rigid tube. A first connecting sleeve is fixedly sleeved at the front end of the rigid tube, and a changing sealing element is slidably installed through the first connecting sleeve. A connector is sealed and snapped into the inner cavity of the front end of the first connecting sleeve, and a flexible tube is connected and installed through the connector. A second connecting sleeve is fixedly sleeved at the front end of the flexible tube, and a suction probe is sealed and snapped into the inner cavity of the front end of the second connecting sleeve. An airbag is embedded in the outer periphery of the suction probe, and the airbag has a plurality of airbag holes. The airbag holes are respectively connected to the suction probe. A hollow lubricating sphere is connected to the outer opening of the airbag hole by a thin wire. The surface of the airbag is formed into a closed lubricating oil storage chamber by superposition and bonding.

[0007] Furthermore, the rigid tube is provided with an inflation port and an air intake port. The inflation port in the rigid tube is sealed to the inflation output end of the bidirectional pump, and the air intake port in the rigid tube is sealed to the air intake input end of the bidirectional pump. The collection tank is connected to the air intake port in the rigid tube.

[0008] Furthermore, a first slot is provided at the upper end of the front end of the first connecting sleeve, and a through groove is provided at the rear end of the first connecting sleeve, with a pair of first hemispherical grooves respectively provided on the inner walls on both sides of the upper end of the through groove.

[0009] Furthermore, a limiting inner groove is provided on the inner wall of one side of the inner end of the first card slot, and the front end side wall of the limiting inner groove is inclined, and a second hemispherical groove is provided on the inner side wall of the front end of the limiting inner groove.

[0010] Furthermore, a connecting hole is provided at the upper end of the changing sealing component, and pressing blocks are fixedly installed at the upper and lower ends of the changing sealing component, and receiving grooves are respectively provided on the upper outer walls on both sides of the changing sealing component, and a limiting block is elastically slidably installed at the opening of the receiving groove through a connecting spring, and the outer end of the limiting block is hemispherical.

[0011] Furthermore, a first small hole and a first large hole are respectively provided in the middle of the connector, and a first locking block is fixedly installed on the outer wall of the outer periphery of the connector, and a hemispherical locking block is fixedly installed on the outer wall of the front end of the first locking block.

[0012] Furthermore, the hose is provided with a second small hole and a second large hole, and the second small hole is connected to the first small hole, and the second large hole is connected to the first large hole.

[0013] Furthermore, a second slot is provided at the upper end of the front end of the second connecting sleeve, and a second block is fixedly installed on the outer rear wall of the outer periphery of the suction probe. The structure and connection method of the second block and the second slot are the same as those of the first slot and the first block, and the installation method between the second block and the second slot is the same as that between the first slot and the first block.

[0014] Furthermore, the suction probe has an annular groove in the middle for embedding and storing the airbag, an L-shaped inflation hole at the upper end of the rear end of the suction probe and a second small hole connected to it, a large suction hole at the lower middle end of the rear end of the suction probe and a second large hole connected to it, and several suction through holes are evenly arranged on the inner wall of the annular groove and are connected to the airbag holes.

[0015] Furthermore, a splitting groove is provided in the middle of the hollow lubricating sphere. The splitting groove extends along the diameter of the hollow lubricating sphere, and the bottom of the splitting groove does not penetrate the wall thickness of the hollow lubricating sphere. The wall thickness at the splitting groove is less than the wall thickness at other locations of the hollow lubricating sphere.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When medical personnel insert the suction probe, cuff, and tubing into the patient's airway, the cuff's placement within the annular groove greatly reduces the outer diameter of the suction probe during insertion. This not only makes insertion easier but also significantly reduces damage to the airway wall, improving the smoothness and safety of the intubation procedure. Furthermore, after inserting the suction probe, cuff, and tubing into the patient's airway, the cuff can be inflated first, bringing the cuff opening close to the airway wall. Then, the inhalation function is activated, allowing airway secretions to be suctioned and cleared through the cuff opening, ensuring effective clearance while minimizing damage to the airway wall. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the transformation sealing component and the first connecting sleeve of the present invention; Figure 4 This is a schematic diagram of the changing sealing member of the present invention in different states in the first connecting sleeve; Figure 5 This is a cross-sectional view of the first connecting sleeve of the present invention; Figure 6 This is a schematic diagram of the disassembled structure of the second connecting sleeve and the suction probe of the present invention; Figure 7 This is a cross-sectional view of the hose, connector, second connecting sleeve, and suction probe of the present invention; Figure 8 This is a side cross-sectional view of the inflated airbag of the present invention; Figure 9 This is a schematic diagram of the hollow lubricated sphere of the present invention being pulled apart; Figure 10 For the present invention Figure 9 Enlarged view of point A; Figure 11 This is a front cross-sectional view of the airbag inflation state changes of the present invention.

[0018] In the diagram: 1. Bidirectional pump; 2. Rigid pipe; 3. Collection tank; 4. First connecting sleeve; 41. First slot; 411. Restricting inner groove; 412. Second hemispherical groove; 42. Through groove; 43. First hemispherical groove; 5. Flexible hose; 51. Second small hole; 52. Second large hole; 6. Connector; 61. First small hole; 62. First large hole; 63. First locking block; 631. Hemispherical locking block; 7. Second connecting sleeve; 71. Second locking block 8. Groove; 81. Suction probe; 82. Annular groove; 83. L-shaped inflation hole; 84. Suction through hole; 85. Second locking block; 9. Airbag; 10. Changing sealing component; 101. Pressing block; 102. Retraction groove; 103. Connecting spring; 104. Limiting block; 20. Hollow lubricating ball; 201. Splitting groove; 30. Lubricating oil storage chamber; 40. Connecting hole; 50. Airbag hole; 60. Thin wire. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To address the technical problem that the suction probe 8 needs to be close to the patient's airway wall, which leads to friction between the suction probe 8 and the patient's airway wall during insertion and removal, such as... Figure 1 , Figure 2 and Figures 6-11 As shown, the following preferred technical solutions are provided: An ICU airway secretion clearance device includes a bidirectional pump 1 and a rigid tube 2 fixedly installed on the output and input ports of the bidirectional pump 1. A collection container 3 is fixedly connected to the bottom of the rigid tube 2, and the collection container 3 is connected to the inhalation port in the rigid tube 2 to collect airway secretions inhaled into the rigid tube 2. This is prior art and will not be described in detail here. A first connecting sleeve 4 is fixedly sleeved at the front end of the rigid tube 2, and a changing sealing element 10 is slidably installed through the first connecting sleeve 4. The changing sealing element 10 is used to ensure that the bidirectional pump 1 maintains airway secretion during inhalation. During inflation, a completely sealed operation can be performed independently. A connector 6 is sealed and snapped into the inner cavity of the front end of the first connecting sleeve 4, and a hose 5 is connected and installed on the connector 6. A second connecting sleeve 7 is fixedly sleeved at the front end of the hose 5, and a suction probe 8 is sealed and snapped into the inner cavity of the front end of the second connecting sleeve 7. An airbag 9 is embedded in the outer periphery of the suction probe 8, and the airbag 9 has several airbag holes 50. The airbag holes 50 and the airbag 9 are not interconnected, but the airbag holes 50 are respectively connected to the suction probe 8. A hollow lubricated sphere 20 is connected to the outer opening of the hole 50 by a thin thread 60. The position of the hollow lubricated sphere 20 is such that when the hollow lubricated sphere 20 is pulled into two hemispheres, the length of the thin thread 60 plus the length of the hemispheres cannot support the hemispheres to pass through the opening of the airbag hole 50, ensuring that the hemispheres will not damage the inner wall of the patient's airway. The thin thread 60 is made of medical-grade sterile soft material, and the hollow lubricated sphere 20 is preferably made of medical-grade easy-tear modified silicone material, ensuring that the hollow lubricated sphere 20 can be easily torn into two hemispheres. The hollow lubricating sphere 20 is filled with medical-grade lubricating oil to lubricate the airbag holes 50. The surface of the airbag 9 is bonded together to form a closed lubricating oil storage chamber 30, which stores medical-grade lubricating oil. The adhesive used for bonding is medical-grade adhesive, and its bonding strength is adapted to the requirements of the device. It can achieve stable bonding under static, sterilization and transportation conditions, ensuring the sealing of the lubricating oil storage chamber 30. It can also be easily debonded under the radial tension generated when the airbag 9 is inflated, thereby releasing the lubricating oil onto the surface of the airbag 9.

[0021] Among them, the hose 5, connector 6, second connecting sleeve 7, suction probe 8, air bag 9, thin wire 60 and hollow lubricating ball 20 are all disposable sterile medical consumables, for single use by a single person only, and are discarded after use to avoid cross-infection and ensure the safety of clinical use.

[0022] Specifically, during the inflation of the airbag 9, the lubricating oil storage chamber 30 is opened, allowing the lubricating oil to be released onto the surface of the airbag 9, thereby lubricating the surface of the airbag 9 and reducing the damage to the inner wall of the patient's airway when the airbag 9 slides in the patient's airway.

[0023] The rigid pipe 2 is provided with an air inlet and an air inlet. The air inlet in the rigid pipe 2 is sealed to the air output end of the bidirectional pump 1, and the air inlet in the rigid pipe 2 is sealed to the air input end of the bidirectional pump 1. The collection tank 3 is connected to the air inlet in the rigid pipe 2.

[0024] The hose 5 is provided with a second small hole 51 and a second large hole 52, and the second small hole 51 is connected to the first small hole 61, and the second large hole 52 is connected to the first large hole 62.

[0025] A second slot 71 is provided at the upper end of the front end of the second connecting sleeve 7. A second block 85 is fixedly installed on the outer wall of the rear end of the suction probe 8. The structure and connection method of the second block 85 and the second slot 71 are the same as those of the first slot 41 and the first block 63, respectively. The installation method between the second block 85 and the second slot 71 is the same as that between the first slot 41 and the first block 63.

[0026] An annular groove 81 for embedding and storing the airbag 9 is provided in the middle of the suction probe 8. An L-shaped inflation hole 82 is provided at the upper end of the rear end of the suction probe 8, and the L-shaped inflation hole 82 is connected to the second small hole 51. A large suction hole 83 is provided at the lower middle part of the rear end of the suction probe 8, and the large suction hole 83 is connected to the second large hole 52. A number of suction through holes 84 are evenly provided on the inner wall of the annular groove 81, and the suction through holes 84 are connected to the airbag hole 50. In the initial state, the airbag 9 is folded and stored in the annular groove 81.

[0027] A splitting groove 201 is provided in the middle of the hollow lubricated sphere 20. The splitting groove 201 extends along the diameter of the hollow lubricated sphere 20, and the bottom of the splitting groove 201 does not penetrate the wall thickness of the hollow lubricated sphere 20. The wall thickness at the splitting groove 201 is less than the wall thickness at other locations of the hollow lubricated sphere 20, which facilitates the hollow lubricated sphere 20 being pulled into two hemispheres along the splitting groove 201. The cross-sectional shape of the splitting groove 201 is preferably set in a "V" shape, wherein the strength of the thin wire 60 itself and its adhesion to the inner wall of the air bladder hole 50 is greater than the strength of the hollow lubricated sphere 20 being pulled into two hemispheres.

[0028] Specifically, during the process of medical personnel inserting the suction probe 8, the cuff 9, and the tubing 5 into the patient's airway, the setting of the cuff 9 being housed in the annular groove 81 can greatly reduce the outer diameter of the suction probe 8 during insertion. This not only makes it easier to insert the suction probe 8 into the patient's airway, but also greatly reduces damage to the inner wall of the patient's airway, improving the smoothness and safety of the intubation operation. Furthermore, after inserting the suction probe 8, cuff 9, and tubing 5 into the patient's airway, the inflation function of the bidirectional pump 1 can be activated. Gas is then injected into the cuff 9 through the inflation port, connecting hole 40, first small hole 61, second small hole 51, and L-shaped inflation hole 82 in the rigid tube 2. This causes the cuff 9 to continuously expand within the patient's airway until it reaches a preset size. At this point, the opening of the cuff orifice 50 is close to the inner wall of the patient's airway. For a detailed schematic diagram of the inflated cuff orifice 50, please refer to [link to schematic diagram]. Figure 8 and Figure 11 Then, turn off the inflation function of the bidirectional pump 1 and turn on the inhalation function. With the connection of the inhalation hole, connecting hole 40, first large hole 62, second large hole 52, inhalation large hole 83, inhalation through hole 84 and air bag hole 50 in the rigid tube 2, airway secretions can be inhaled and cleared, ensuring the clearing effect while greatly reducing damage to the inner wall of the patient's airway. Furthermore, during the inflation of the airbag 9, the airbag hole 50 will continuously expand along with the airbag 9. By setting the split groove 201, the thin line 60 can be used to pull the hollow lubricating ball 20 into two hemispheres, so that the lubricating oil in the hollow lubricating ball 20 flows into the airbag hole 50, ensuring the lubrication of the inner wall of the airbag hole 50 and preventing viscous secretions from clogging the airbag hole 50.

[0029] To address the technical problem of preventing damage to the patient's airway caused by continuous inflation and inhalation during the use of the bidirectional pump 1, such as... Figures 1-5 As shown, the following preferred technical solutions are provided: The first connecting sleeve 4 has a first slot 41 at the upper end of the front end, and a through groove 42 is provided at the rear end of the first connecting sleeve 4. A pair of first hemispherical grooves 43 are respectively provided on the inner walls on both sides of the upper end of the through groove 42.

[0030] A limiting inner groove 411 is provided on the inner wall of one side of the inner end of the first slot 41, and the front end side wall of the limiting inner groove 411 is inclined. For details, please refer to [link to relevant documentation]. Figure 5 A second hemispherical groove 412 is provided on the inner side wall of the front end of the inner cavity of the inner groove 411.

[0031] The upper end of the change sealing component 10 is provided with a connecting hole 40. Pressing blocks 101 are fixedly installed at the upper and lower ends of the change sealing component 10, and receiving grooves 102 are respectively provided on the upper outer walls on both sides of the change sealing component 10. Limiting blocks 104 are elastically slidably installed at the opening of the receiving grooves 102 through connecting springs 103. The outer end of the limiting blocks 104 is hemispherical. The limiting blocks 104 are respectively engaged in the first hemispherical grooves 43.

[0032] The connector 6 has a first small hole 61 and a first large hole 62 respectively in the middle part, and a first locking block 63 is fixedly installed on the outer wall of the outer rear end of the connector 6. The first small hole 61 corresponds to the air inlet in the rigid tube 2, and the first large hole 62 corresponds to the air inlet in the rigid tube 2. A hemispherical locking block 631 is fixedly installed on the outer wall of the front end of the first locking block 63. The hemispherical locking block 631 is made of medical soft plastic and can be deformed to a certain extent to ensure that it can be smoothly locked in the second hemispherical groove 412.

[0033] Specifically, when it is necessary to install the connector 6 on the first connecting sleeve 4, the first locking block 63 can be aligned with the first locking groove 41 and inserted. Then, medical personnel can rotate the connector 6 to make the first locking block 63 slide along the inner limiting groove 411 until the hemispherical locking block 631 is engaged in the second hemispherical groove 412, thus fixing the connector 6 on the first connecting sleeve 4. At the same time, because the front end side wall of the inner cavity of the inner limiting groove 411 is inclined, the rear end outer wall of the connector 6 will be pressed against the surface of the changing sealing component 10 during the sliding of the first locking block 63 along the inner limiting groove 411, ensuring airtightness. When removing, the above steps can be reversed. The installation method is quick and convenient.

[0034] Furthermore, by setting the changing sealing component 10, when medical personnel use the bidirectional pump 1 to inflate the airbag 9, the limiting block 104 can be engaged in the first hemispherical groove 43 at the upper end. At this time, the connecting hole 40 will be connected to the inflation hole and the first small hole 61 in the rigid tube 2, while the suction hole and the first large hole 62 in the rigid tube 2 are blocked, thus ensuring that the bidirectional pump 1 can inflate the airbag 9 normally. After inflation, by pushing the changing sealing component 10 downward, the connecting hole 40 will be connected to the suction hole and the first large hole 62 in the rigid tube 2, while the inflation hole and the first small hole 61 in the rigid tube 2 are blocked. This setting of single inhalation and inflation prevents the bidirectional pump 1 from malfunctioning during use and continuously inflating and inhaling, which could cause damage to the patient's airway.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An airway secretion clearance device for ICU use, comprising a bidirectional pump (1) and a rigid tube (2) fixedly installed on the output and input ports of the bidirectional pump (1), wherein a collection container (3) is fixedly connected to the bottom of the rigid tube (2), characterized in that: The front end of the rigid tube (2) is fixedly sleeved with a first connecting sleeve (4), and a changing sealing component (10) is slidably installed on the first connecting sleeve (4). A connector (6) is sealed and snapped into the inner cavity of the front end of the first connecting sleeve (4), and a hose (5) is connected and installed on the connector (6). The front end of the hose (5) is fixedly sleeved with a second connecting sleeve (7), and a suction probe (8) is sealed and snapped into the inner cavity of the front end of the second connecting sleeve (7). An airbag (9) is embedded in the outer periphery of the suction probe (8), and a plurality of airbag holes (50) are provided on the airbag (9). The airbag holes (50) are respectively connected to the suction probe (8). A hollow lubricating ball (20) is connected to the airbag hole (50) near the outer opening through a thin wire (60). The surface of the airbag (9) is formed by superimposed bonding to form a closed lubricating oil storage chamber (30).

2. The airway secretion clearance device for ICU use according to claim 1, characterized in that: The rigid tube (2) is provided with an air inlet and an air inlet. The air inlet in the rigid tube (2) is sealed to the air output end of the bidirectional pump (1), and the air inlet in the rigid tube (2) is sealed to the air input end of the bidirectional pump (1). The collection tank (3) is connected to the air inlet in the rigid tube (2).

3. The airway secretion clearance device for ICU use according to claim 1, characterized in that: The first connecting sleeve (4) has a first slot (41) at the upper end of the front end, and a through groove (42) is provided at the rear end of the first connecting sleeve (4). A pair of first hemispherical grooves (43) are respectively provided on the inner walls of the two sides of the upper end of the through groove (42).

4. The airway secretion clearance device for ICU use according to claim 3, characterized in that: A limiting inner groove (411) is provided on the inner wall of one side of the inner end of the first card slot (41), and the front end side wall of the limiting inner groove (411) is inclined. A second hemispherical groove (412) is provided on the inner side wall of the front end of the limiting inner groove (411).

5. The airway secretion clearance device for ICU use according to claim 1, characterized in that: The upper end of the changing sealing component (10) is provided with a connecting hole (40), and the upper and lower ends of the changing sealing component (10) are respectively fixedly installed with pressing blocks (101). The upper outer walls on both sides of the changing sealing component (10) are respectively provided with receiving grooves (102). The opening of the receiving groove (102) is elastically slidably installed with a limiting block (104) through a connecting spring (103). The outer end of the limiting block (104) is hemispherical.

6. The airway secretion clearance device for ICU use according to claim 3, characterized in that: The connector (6) is provided with a first small hole (61) and a first large hole (62) at the middle part, and a first locking block (63) is fixedly installed on the outer wall of the outer periphery rear end of the connector (6). A hemispherical block (631) is fixedly installed on the outer wall of the front end of the first block (63).

7. The airway secretion clearance device for ICU use according to claim 6, characterized in that: The hose (5) is provided with a second small hole (51) and a second large hole (52), and the second small hole (51) is connected to the first small hole (61), and the second large hole (52) is connected to the first large hole (62).

8. The airway secretion clearance device for ICU use according to claim 6, characterized in that: A second slot (71) is provided at the upper end of the front end of the second connecting sleeve (7); A second card block (85) is fixedly installed on the outer wall of the rear end of the suction probe (8). The structure and connection method of the second card block (85) and the second card slot (71) are the same as those of the first card slot (41) and the first card block (63). The installation method between the second card block (85) and the second card slot (71) is the same as that between the first card slot (41) and the first card block (63).

9. An ICU airway secretion clearance device according to claim 7, characterized in that: The suction probe (8) has an annular groove (81) for embedding and storing the airbag (9) at the middle part. An L-shaped inflation hole (82) is provided at the upper end of the rear end of the suction probe (8), and the L-shaped inflation hole (82) is connected to the second small hole (51). A large suction hole (83) is provided at the lower middle part of the rear end of the suction probe (8), and the large suction hole (83) is connected to the second large hole (52). A number of suction through holes (84) are evenly provided on the inner wall of the annular groove (81), and the suction through holes (84) are connected to the airbag holes (50).

10. An ICU airway secretion clearance device according to claim 1, characterized in that: The hollow lubricating sphere (20) has a splitting groove (201) in the middle. The splitting groove (201) extends along the diameter of the hollow lubricating sphere (20), and the bottom of the splitting groove (201) does not penetrate the wall thickness of the hollow lubricating sphere (20). The wall thickness at the splitting groove (201) is less than the wall thickness at other positions of the hollow lubricating sphere (20).

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