PCD device for monitoring sterilization effect

Abstract

The invention discloses a PCD device for monitoring a sterilization effect, and belongs to the technical field of medical disinfection and sterilization. The PCD device for monitoring the sterilization effect comprises a PCD pipe, and the PCD pipe comprises a reaction pipe and a gas guide pipe communicated with the reaction pipe; the indicator cabin is mounted in the reaction tube; the first cabin body which can be movably sealed by the second cabin body is arranged, the pressure jacking assembly driven by the pressure effect is further arranged, and linkage control is conducted between the first elastic piece and the second cabin body; the pressure jacking assembly can automatically respond according to the change of the internal pressure of the sterilization equipment and drive the second cabin body to communicate with the first cabin body, and meanwhile, the first elastic piece can ensure that the second cabin body and the first cabin body keep staggered after sterilization is finished, so that the first cabin body is closed; the sterilized biological indicator is prevented from being in contact with the external environment in the process of being taken out for culture, and the accuracy of a monitoring result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of medical disinfection and sterilization, and in particular to a PCD device for monitoring sterilization effects. Background Art

[0002] The PCD device, whose full name is Process Challenge Device, is a sterilization process verification device. It is a device specially designed to evaluate the effectiveness of the sterilization process. It can simulate the challenges and difficulties encountered in the process of the sterilization medium effectively contacting the surface of a device to be sterilized.

[0003] PCD devices can be divided into biological PCD devices and chemical PCD devices. The core of biological PCD devices is that they contain biological indicators carrying microorganisms. When verifying the sterilization process, the PCD device with biological indicators inside and the instrument to be sterilized are placed in the same sterilization equipment for sterilization. The medium in the sterilization equipment enters the PCD device and contacts the biological indicator to react. After the reaction is completed, the biological indicator is cultured. If the microorganisms carried on the biological indicator are killed, it indicates that the sterilization process has achieved the expected effect.

[0004] The defect of the existing PCD device is that the biological indicator lacks effective airtight protection after sterilization, so that the biological indicator is exposed to the environment and contacts with the external environment during the process of being taken out for cultivation after sterilization, resulting in the mixing of microorganisms, bacteria and other substances existing in the environment, which affects the final cultivation result of the biological indicator, thereby causing misjudgment of the sterilization performance of the sterilization equipment, making it impossible to know the true sterilization effect of the sterilization equipment, and causing distortion of the monitoring results. Summary of the invention

[0005] The object of the present invention is to provide a PCD device for monitoring the sterilization effect to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A PCD device for monitoring sterilization effect, comprising:

[0008] A PCD tube, wherein the PCD tube comprises a reaction tube and an air guide tube connected to the reaction tube;

[0009] The indicator chamber is installed in the reaction tube, and comprises a first chamber body for loading the biological indicator and a second chamber body which can be slidably covered on the outside of the first chamber body, and the first chamber body side wall and the second chamber body side wall are provided with a first through hole and a second through hole which can be connected with each other;

[0010] A first elastic member is used to connect the first cabin and the second cabin. Under normal conditions, the first elastic member is stretched so that the first through hole and the second through hole are staggered, and the inner wall of the first elastic member fits with the outer wall of the first cabin to close the first cabin;

[0011] The pressure lifting assembly includes a movable plate, a connecting rod and a piston. The movable plate is arranged in the reaction tube and the top surface of the movable plate abuts against the bottom surface of the second cabin. The connecting rod is movably arranged in the air guide tube and the bottom is connected to the piston. The other end of the piston is sealed against the end of the air guide tube to close the PCD tube under normal pressure. The gas in the high pressure state pushes the piston upward, driving the movable plate to lift the second cabin so that the first through hole and the second through hole are aligned and connected.

[0012] The second elastic member is arranged in the reaction tube, the top end of the second elastic member abuts against the top wall in the reaction tube, and the bottom end abuts against the top surface of the movable plate, and is used to drive the movable plate to reset under normal conditions.

[0013] Furthermore, the indicator cabin also includes a mounting portion, the bottom end of the mounting portion has a mounting rod, the mounting rod is provided with a mounting hole, the interior of the mounting hole has a first internal thread, the outer wall of the top of the first cabin body has a first external thread matching the first internal thread, the first cabin body and the mounting portion are detachably connected via threads, and the mounting portion is also provided with a second sealing ring on the inner wall of the mounting hole for enhancing the sealing of the connection between the first cabin body and the mounting portion.

[0014] Furthermore, an axially extending guide slot is provided on the side wall of the first cabin body, and a guide slider matching the guide slot is provided on the inner side wall of the second cabin body to guide the second cabin body to move along the guide slot relative to the first cabin body.

[0015] Furthermore, the top of the reaction tube has an opening, the upper end of the opening is provided with an outwardly protruding connecting end, the inner wall of the connecting end is provided with a second internal thread, the outer wall of the mounting rod is provided with a second external thread matching the second internal thread, the second internal thread and the second external thread are threadedly connected, so that the indicator cabin is detachably fixedly connected to the reaction tube.

[0016] Furthermore, a first sealing ring is sleeved on the root of the external thread of the mounting rod. When the mounting rod is threadedly connected to the connecting end, the first sealing ring abuts against the top surface of the connecting end to seal the opening of the reaction tube.

[0017] Furthermore, an annular groove is provided on the bottom wall of the reaction tube, a third sealing ring is installed in the groove, the top surface of the third sealing ring protrudes from the bottom wall end surface of the reaction tube, and under normal pressure, the bottom surface of the movable plate abuts against the top surface of the third sealing ring to seal the reaction tube.

[0018] Furthermore, the reaction tube is coaxial with the air guide tube and integrally connected, the air guide tube is provided with an air guide channel connected to the reaction tube along the axis, the connecting rod is arranged in the air guide channel and is coaxial with the air guide channel, the end of the air guide tube is provided with a limiting ring radially protruding from the inner wall of the air guide channel, the center of the limiting ring is provided with an air inlet hole, and the piston at the bottom of the connecting rod is against the air inlet hole for closing or opening the air inlet hole.

[0019] Furthermore, a clamping ring is mounted on the outer periphery of the side wall of the piston, the diameter of the clamping ring matches the inner diameter of the air guide channel, the clamping ring is slidably connected to the air guide channel, and a plurality of first air holes are provided on the outer periphery of the clamping ring, and the first air holes are arranged through the upper and lower end surfaces of the clamping ring.

[0020] Furthermore, the end of the air guide tube is detachably connected to a capillary assembly, and the end of the air guide channel away from the reaction tube is connected to the capillary assembly through an air inlet hole.

[0021] Furthermore, the capillary tube assembly includes a joint and a capillary hose connected to the joint, the top of the joint has a connecting hole, the inner wall of the connecting hole is provided with a third internal thread, and the outer wall of the end of the air guide tube is provided with a third external thread matching the third internal thread, for realizing a detachable connection between the capillary tube assembly and the air guide tube.

[0022] Compared with the prior art, the present invention provides a PCD device for monitoring the sterilization effect, which has the following beneficial effects:

[0023] 1. The present invention provides a first cabin that can be movably closed by a second cabin, and also provides a pressure-driven pressure-lifting assembly and a first elastic member that are respectively linked and controlled with the second cabin. The pressure-lifting assembly can automatically respond to changes in the internal pressure of the sterilization equipment and drive the second cabin to communicate with the first cabin. At the same time, the first elastic member can ensure that the second cabin and the first cabin remain misaligned after the sterilization is completed, thereby closing the first cabin, avoiding the sterilized biological indicator from contacting the external environment during the process of being taken out for cultivation, and ensuring the accuracy of the monitoring results.

[0024] 2. The present invention integrates multiple components such as reaction tubes, air ducts, indicator cabins, elastic parts, pressure lifting components, etc., which can simulate the difficult-to-enter, semi-enclosed narrow cavity environment in the sterilized equipment, making the sterilization process closer to extreme usage conditions and meeting the monitoring needs in complex sterilization environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a PCD device for monitoring sterilization effect proposed by the present invention;

[0026] Figure 2A schematic cross-sectional view of a three-dimensional structure of a PCD device for monitoring sterilization effect proposed by the present invention;

[0027] Figure 3 A cross-sectional view of the indicator compartment structure of a PCD device for monitoring sterilization effect proposed by the present invention;

[0028] Figure 4 This is a schematic diagram of a three-dimensional explosion structure of an indicator compartment of a PCD device for monitoring sterilization effect proposed by the present invention;

[0029] Figure 5 A PCD device for monitoring sterilization effect proposed by the present invention Figure 2 A partial enlarged schematic diagram of the structure at center A;

[0030] Figure 6 A PCD device for monitoring sterilization effect proposed by the present invention Figure 2 A partial enlarged schematic diagram of the structure at B in the middle;

[0031] Figure 7 A schematic diagram of the three-dimensional structure of a pressure lifting component of a PCD device for monitoring sterilization effect proposed by the present invention;

[0032] Figure 8 It is a front view schematic diagram of the connection state of the first through hole and the second through hole in the indicator cabin structure of the PCD device for monitoring the sterilization effect proposed by the present invention.

[0033] In the figure: 1. indicator cabin; 11. mounting portion; 111. first internal thread; 112. second external thread; 113. first sealing ring; 114. second sealing ring; 12. first cabin body; 121. guide slide groove; 122. first through hole; 123. first external thread; 13. second cabin body; 131. guide slider; 132. second through hole; 14. first elastic member; 2. PCD tube; 21. reaction tube; 211. third sealing ring; 212. second internal thread; 22. air guide tube; 221. third external thread; 3. capillary assembly; 31. joint; 311. third internal thread; 32. capillary hose; 4. pressure lifting assembly; 42. movable plate; 43. connecting rod; 431. clamping ring; 432. first air hole; 44. piston; 5. second elastic member. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] Example:

[0037] like Figure 1 - Figure 8 As shown, a PCD device for monitoring sterilization effect comprises:

[0038] PCD tube 2, PCD tube 2 includes a reaction tube 21 and an air guide tube 22 connected to the reaction tube 21;

[0039] The indicator chamber 1 is installed in the reaction tube 21, and includes a first chamber 12 for loading biological indicators and a second chamber 13 slidably covered on the outside of the first chamber 12. The side walls of the first chamber 12 and the second chamber 13 are provided with a first through hole 122 and a second through hole 132 that can be connected to each other.

[0040] The first elastic member 14 is used to connect the first cabin 12 and the second cabin 13. Under normal conditions, the first elastic member 14 is stretched to stagger the first through hole 122 and the second through hole 132, and the inner wall of the first elastic member 14 fits the outer wall of the first cabin 12 to seal the first cabin 12;

[0041] The pressure lifting assembly 4 includes a movable plate 42, a connecting rod 43 and a piston 44. The movable plate 42 is arranged in the reaction tube 21 and the top surface of the movable plate 42 abuts against the bottom surface of the second cabin 13. The connecting rod 43 is movably arranged in the air guide tube 22 and the bottom is connected to the piston 44. The other end of the piston 44 abuts against the end of the air guide tube 22 in a sealed manner, and the PCD tube 2 is sealed under normal pressure. The gas in the high pressure state pushes the piston 44 to move upward, driving the movable plate 42 to lift the second cabin 13 so that the first through hole 122 and the second through hole 132 are aligned and connected;

[0042] The second elastic member 5 is disposed in the reaction tube 21, the top end of the second elastic member 5 abuts against the top wall of the reaction tube 21, and the bottom end abuts against the top surface of the movable plate 42, and is used to drive the movable plate 42 to reset in normal state;

[0043] When in use, the biological indicator is placed in the first cabin 12 in the indicator cabin 1. The first cabin 12 and the second cabin 13 are connected by a first elastic member 14. The first elastic member 14 is an elastic rubber sleeve that is fitted on the outer wall of the first cabin 12. Under normal circumstances, the first elastic member 14 is in an extended state, so that the first through hole 122 on the first cabin 12 and the second through hole 132 on the second cabin 13 are staggered with each other, and the inner wall of the first elastic member 14 fits the first cabin 12, so that the first cabin 12 is in a closed state to prevent the biological indicator from contacting the outside world.

[0044] like Figure 3 , Figure 4 As shown, the indicator cabin 1 also includes a mounting portion 11, the bottom end of the mounting portion 11 has a mounting rod, the mounting rod is provided with a mounting hole, the interior of the mounting hole has a first internal thread 111, the outer wall of the top of the first cabin body 12 has a first external thread 123 matching the first internal thread 111, the first cabin body 12 and the mounting portion 11 are detachably connected through threads, and the mounting portion 11 is located on the inner wall of the mounting hole and is further provided with a second sealing ring 114, which is used to enhance the sealing performance of the connection between the first cabin body 12 and the mounting portion 11;

[0045] When in use, the biological indicator is placed from the top of the first cabin 12 by disassembling the mounting portion 11 .

[0046] like Figure 3 , Figure 4 As shown, an axially extending guide slot 121 is provided on the side wall of the first cabin 12, and a guide slider 131 matching the guide slot 121 is provided on the inner side wall of the second cabin 13 to guide the second cabin 13 to move along the guide slot 121 relative to the first cabin 12;

[0047] When in use, the second cabin body 13 moves under the guidance of the guide groove through the guide slider 131 to avoid deviation when the first through hole 122 and the second through hole 132 are aligned and connected.

[0048] like Figure 2 , Figure 5 As shown, the top of the reaction tube 21 has an opening, the upper end of the opening is provided with an outwardly protruding connecting end, the inner wall of the connecting end is provided with a second internal thread 212, the outer wall of the mounting rod is provided with a second external thread 112 matching the second internal thread 212, the second internal thread 212 and the second external thread 112 are threadedly connected, so that the indicator chamber 1 is detachably fixedly connected to the reaction tube 21.

[0049] like Figure 5 As shown, the root of the external thread of the mounting rod is also covered with a first sealing ring 113 . When the mounting rod is threadedly connected to the connecting end, the first sealing ring 113 abuts against the top surface of the connecting end to close the opening of the reaction tube 21 .

[0050] like Figure 2 As shown, an annular groove is provided on the bottom wall of the reaction tube 21, and a third sealing ring 211 is installed in the groove. The top surface of the third sealing ring 211 protrudes from the end surface of the bottom wall of the reaction tube 21. Under normal pressure, the bottom surface of the movable plate 42 abuts against the top surface of the third sealing ring 211 to close the reaction tube 21.

[0051] like Figure 2 As shown, the reaction tube 21 is coaxial with the air guide tube 22 and is connected in one piece. The air guide tube 22 is provided with an air guide channel connected to the reaction tube 21 along the axis. The connecting rod 43 is arranged in the air guide channel and is coaxial with the air guide channel. The end of the air guide tube 22 is provided with a limiting ring radially protruding from the inner wall of the air guide channel. The center of the limiting ring is provided with an air inlet hole. The piston 44 at the bottom of the connecting rod 43 is against the air inlet hole for closing or opening the air inlet hole.

[0052] like Figure 2 , Figure 6 , Figure 7 As shown, a clamping ring 431 is mounted on the outer periphery of the side wall of the piston 44. The diameter of the clamping ring 431 matches the inner diameter of the air guide channel. The clamping ring 431 is slidably connected to the air guide channel, and a plurality of first air holes 432 are provided on the outer periphery of the clamping ring 431. The first air holes 432 are arranged through the upper and lower end surfaces of the clamping ring 431.

[0053] like Figure 2 As shown, the end of the air guide tube 22 is detachably connected to the capillary assembly 3, and the end of the air guide channel away from the reaction tube 21 is connected to the capillary assembly 3 through the air inlet hole;

[0054] When in use, it is used to simulate the difficult-to-access, semi-enclosed narrow cavity environment in the sterilized device.

[0055] like Figure 6 As shown, the capillary assembly 3 includes a connector 31 and a capillary hose 32 connected to the connector 31. The top of the connector 31 has a connecting hole, and the inner wall of the connecting hole is provided with a third internal thread 311. The outer wall of the end of the air guide tube 22 is provided with a third external thread 221 matching the third internal thread 311, which is used to realize a detachable connection between the capillary assembly 3 and the air guide tube 22.

[0056] When in use, the PCD device is placed in the sterilization equipment together with the instrument to be sterilized. At this time, the second elastic member 5 in the reaction tube 21 is in an extended state under normal pressure, and its lower end abuts against the movable plate 42, so that the movable plate 42 pushes the piston 44 through the connecting rod 43 to abut against the air inlet hole on the limit ring at the end of the air guide tube 22 under normal conditions, thereby closing the air guide channel of the PCD tube 2. During the sterilization process, the sterilization equipment is pressurized so that the sterilizing gas can enter the gaps and lumens of the instrument to be sterilized under pressure; as the internal pressure of the sterilization equipment gradually increases, the sterilizing gas enters the PCD device through one end of the capillary hose 32 and enters the PCD device. The piston 44 is pushed upward by the pressure, and the seal between the piston 44 and the air inlet is broken, so that the sterilizing gas flows through the first air hole 432 on the clamping ring 431 and flows to the reaction tube 21 along the air guide channel. When the piston 44 moves upward, it is pushed by the connecting rod 43 to make the movable plate 42 move upward synchronously to compress the second elastic member 5 and lift the second cabin 13 upward. The second cabin 13 moves upward so that the first elastic member 14 is compressed by the force. Under the further action of the pressure, the sterilizing gas pushes the movable plate 42 to gradually rise and lift the second cabin 13 to slide upward, so that the first through hole 122 and the second through hole 132 are gradually aligned and connected, so that the sterilizing gas After the sterilization is completed, as the internal pressure of the sterilization equipment decreases, the second elastic member 5 starts to drive the movable plate 42 to reset downward, and the piston 44 also resets downward under the combined action of the gas pressure reduction and the first elastic member 14, and the air inlet hole of the air guide channel is reclosed. The first elastic member 14 is no longer subjected to the force that compresses it, and then pushes the second cabin 13 downward, so that the first through hole 122 and the second through hole 132 are staggered again, and the first cabin 12 is closed by the stretched first elastic member 14, thereby preventing the sterilized biological indicator from being removed. During the cultivation process, the sterilizing gas is in contact with the external environment, resulting in the mixing of microorganisms existing in the environment, which affects the final evaluation and judgment of the sterilization performance of the sterilization equipment; after the first cabin 12 is closed, a small amount of sterilization gas remains inside it to continue to react with the biological indicator, simulating the diffusion, penetration and reaction of the sterilization gas with the biological indicator under the complex narrow cavity, blind hole and other environmental conditions in the instrument to be sterilized. The whole process is crucial to verifying the effect of the sterilization equipment, and can reflect whether the sterilization gas can effectively penetrate into every corner of the instrument to be sterilized to kill potential microorganisms under complex and harsh conditions.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PCD device for monitoring sterilization effect, characterized in that: include: A PCD tube (2), the PCD tube (2) comprising a reaction tube (21) and an air guide tube (22) connected to the reaction tube (21); An indicator chamber (1) is installed in a reaction tube (21), comprising a first chamber (12) for loading a biological indicator and a second chamber (13) slidably covered on the outside of the first chamber (12), wherein a first through hole (122) and a second through hole (132) which are in communication with each other are provided on the side walls of the first chamber (12) and the second chamber (13); A first elastic member (14) is used to connect the first cabin (12) and the second cabin (13); in a normal state, the first elastic member (14) is stretched so that the first through hole (122) and the second through hole (132) are staggered, and the inner wall of the first elastic member (14) fits the outer wall of the first cabin (12) to close the first cabin (12); The pressure lifting assembly (4) comprises a movable plate (42), a connecting rod (43) and a piston (44); the movable plate (42) is arranged in the reaction tube (21) and the top surface of the movable plate (42) is in contact with the bottom surface of the second chamber (13); the connecting rod (43) is movably arranged in the air guide tube (22) and the bottom is connected to the piston (44); the other end of the piston (44) is in sealing contact with the end tube (2) of the air guide tube (22) to seal the PCD tube (2) under normal pressure; under high pressure, the gas pushes the piston (44) upward, driving the movable plate (42) to lift the second chamber (13) so that the first through hole (122) and the second through hole (132) are aligned and connected; The second elastic member (5) is arranged in the reaction tube (21), the top end of the second elastic member (5) abuts against the inner top wall of the reaction tube (21), and the bottom end abuts against the top surface of the movable plate (42), and is used to drive the movable plate (42) to reset in a normal state.

2. The PCD device for monitoring sterilization effect according to claim 1, characterized in that: The indicator chamber (1) also includes a mounting portion (11), the bottom end of the mounting portion (11) has a mounting rod, the mounting rod is provided with a mounting hole, the interior of the mounting hole has a first internal thread (111), the outer wall of the top of the first chamber body (12) has a first external thread (123) matching the first internal thread (111), the first chamber body (12) and the mounting portion (11) are detachably connected via threads, and the mounting portion (11) is also provided with a second sealing ring (114) on the inner wall of the mounting hole, which is used to enhance the sealing of the connection between the first chamber body (12) and the mounting portion (11).

3. The PCD device for monitoring sterilization effect according to claim 2, characterized in that: An axially extending guide groove (121) is provided on the side wall of the first cabin body (12), and a guide slider (131) matching the guide groove (121) is provided on the inner side wall of the second cabin body (13) to guide the second cabin body (13) to move along the guide groove (121) relative to the first cabin body (12).

4. The PCD device for monitoring sterilization effect according to claim 3, characterized in that: The top end of the reaction tube (21) has an opening, and the upper end of the opening is provided with an outwardly protruding connection end, and the inner wall of the connection end is provided with a second internal thread (212), and the outer wall of the mounting rod is provided with a second external thread (112) matching the second internal thread (212), and the second internal thread (212) and the second external thread (112) are threadedly connected, so that the indicator chamber (1) is detachably fixedly connected to the reaction tube (21).

5. The PCD device for monitoring sterilization effect according to claim 4, characterized in that: The root of the external thread of the mounting rod is also sleeved with a first sealing ring (113); when the mounting rod is threadedly connected to the connecting end, the first sealing ring (113) abuts against the top surface of the connecting end to seal the opening of the reaction tube (21).

6. The PCD device for monitoring sterilization effect according to claim 5, characterized in that: An annular groove is provided on the bottom wall of the reaction tube (21), and a third sealing ring (211) is installed in the groove. The top surface of the third sealing ring (211) protrudes from the end surface of the bottom wall of the reaction tube (21). Under normal pressure, the bottom surface of the movable plate (42) abuts against the top surface of the third sealing ring (211) to seal the reaction tube (21).

7. The PCD device for monitoring sterilization effect according to claim 1, characterized in that: The reaction tube (21) and the air guide tube (22) are coaxial and integrally connected; the air guide tube (22) is provided with an air guide channel connected to the reaction tube (21) along the axis; the connecting rod (43) is arranged in the air guide channel and is coaxial with the air guide channel; the end of the air guide tube (22) is provided with a limit ring radially protruding from the inner wall of the air guide channel; the center of the limit ring is provided with an air inlet hole; the piston (44) at the bottom of the connecting rod (43) abuts against the air inlet hole and is used to close or open the air inlet hole.

8. The PCD device for monitoring sterilization effect according to claim 7, characterized in that: A clamping ring (431) is sleeved on the outer periphery of the side wall of the piston (44); the diameter of the clamping ring (431) matches the inner diameter of the air guide channel; the clamping ring (431) is slidably connected to the air guide channel; and a plurality of first air holes (432) are provided on the outer periphery of the clamping ring (431); the first air holes (432) are provided through the upper and lower end surfaces of the clamping ring (431).

9. The PCD device for monitoring sterilization effect according to claim 8, characterized in that: The end of the air guide tube (22) is detachably connected to a capillary assembly (3), and the end of the air guide channel away from the reaction tube (21) is connected to the capillary assembly (3) through an air inlet hole.

10. The PCD device for monitoring sterilization effect according to claim 9, characterized in that: The capillary tube assembly (3) comprises a joint (31) and a capillary hose (32) connected to the joint (31); the top end of the joint (31) has a connection hole; the inner wall of the connection hole is provided with a third internal thread (311); the outer wall of the end of the air guide tube (22) is provided with a third external thread (221) matching the third internal thread (311), so as to realize a detachable connection between the capillary tube assembly (3) and the air guide tube (22).

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