Medical surgical aspirator

Abstract

The invention belongs to the technical field of medical instruments, and discloses a medical surgical aspirator which comprises a feedback type pressure cavity, a second hollow pipe is mounted at the bottom of the feedback type pressure cavity, a first hollow pipe is mounted on the side face of the feedback type pressure cavity, a third hollow pipe is mounted at the bottom of the second hollow pipe, and a second hollow pipe is mounted at the bottom of the third hollow pipe. A linkage adjusting mechanism is arranged in the feedback type pressure cavity. Intelligent response and dynamic adjustment to negative pressure changes are achieved by setting the area difference between the outer-layer membrane and the inner-layer membrane and the lever ratio of the L-shaped lever, when negative pressure is increased, the outer-layer membrane is sunken inwards, the baffle is driven to move upwards, the annular gap is reduced and the flow is reduced under the action of the force amplification force of the L-shaped lever, on the contrary, when the negative pressure is reduced, the outer-layer membrane expands outwards, and the flow is reduced. Similarly, the baffle is driven to move downwards under the action of the force amplification force of the L-shaped lever, the annular gap is enlarged, the flow is increased, and the device can automatically adjust the flow according to the actual requirements in the operation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to a medical surgical aspirator. Background Technique

[0002] Medical surgical aspirators are key devices indispensable in modern surgical operations. Their core function is to remove foreign substances such as blood, tissue fluid, and bone chips in the surgical field through negative pressure suction, ensuring a clear surgical field and avoiding the risk of infection caused by blood accumulation or tissue residue. Traditional aspirator systems consist of a negative pressure pump, a liquid storage bottle, an aspiration pipeline, and a control unit. The working principle is that an electric pump generates a constant negative pressure (usually -20 kPa to -80 kPa), which is transmitted through the pipeline to the aspiration head at the surgical end, and the liquid or debris is sucked into the liquid storage bottle using the negative pressure difference.

[0003] In the evolution of technology, the negative pressure control system has gradually evolved from mechanical adjustment to electronic control, which generally includes: an electronic pressure sensor: continuously monitors the negative pressure in the pipeline, controls the opening of the solenoid valve through the PID algorithm, and adjusts the flow rate; variable frequency pump technology: dynamically adjusts the pump speed according to the sensor feedback to maintain a stable negative pressure; a multi-stage filtration system: sets a filter screen at the inlet of the liquid storage bottle to intercept large particulate matter and prevent blockage of the pump body. This set of systems performs well in routine surgeries, but its reliance on electronic components exposes significant limitations in complex surgical scenarios.

[0004] For example, traditional solenoid valves rely on coils to drive the movement of the valve core, and their mechanical response time is about 0.3 - 0.5 seconds. When a sudden blockage occurs in the pipeline during surgery (such as a tissue mass getting stuck in the aspiration head), the system cannot promptly reduce the negative pressure, resulting in the over-adsorption of the blockage and the need for manual dredging, interrupting the surgical process. And when the blockage is suddenly relieved (such as when a large amount of liquid is aspirated), the sudden drop in negative pressure will cause blood to surge back, forcing the surgeon to repeatedly adjust the aspiration intensity. Therefore, it is necessary to improve and optimize it. Summary of the Invention

[0005] To solve the problems in the above background technique that traditional solenoid valves have a slow response during surgery, are prone to difficult blockage handling, and blood surges back in the surgical field, affecting the surgical process, the present invention provides a medical surgical aspirator.

[0006] To achieve the above object, the present invention provides the following technical solution: A medical surgical aspirator, including a feedback pressure cavity, a hollow tube two is installed at the bottom of the feedback pressure cavity, a hollow tube one is installed on the side of the feedback pressure cavity, a hollow tube three is installed at the bottom of the hollow tube two, a linkage adjustment mechanism is arranged inside the feedback pressure cavity, and an anti-blocking mechanism is arranged inside the hollow tube three;

[0007] The linkage adjustment mechanism includes an outer diaphragm installed on the side of the feedback pressure cavity. An inner diaphragm is installed inside the feedback pressure cavity. A fixed block is installed on the bottom inner wall of the feedback pressure cavity. An L-shaped lever is installed inside the fixed block. The L-shaped lever and the fixed block are located between the outer diaphragm and the inner diaphragm. The long arm end of the L-shaped lever is hinged to the inner diaphragm. The short arm end of the L-shaped lever naturally extends vertically downward and is provided with a baffle, and the baffle extends into the third hollow tube.

[0008] Preferably, a circular ring piece is installed on the inner wall of the feedback pressure cavity. The circular ring piece and the inner diaphragm are elastically connected by a preloading spring.

[0009] Preferably, the length value of the upper arm end of the L-shaped lever is 20 mm, the length value of the short arm end of the L-shaped lever is 10 mm, and the leverage ratio of the L-shaped lever is 2:1.

[0010] Preferably, the diameter value of the outer diaphragm is 30 mm and the thickness is 0.5 mm. The diameter value of the inner diaphragm is 15 mm and the thickness value is 0.5 mm.

[0011] Preferably, the preloading spring is in a slightly compressed state under the initial state, and the compression amount of the preloading spring is 1 mm.

[0012] Preferably, the materials of the outer diaphragm and the inner diaphragm are both medical silica gel. The elastic modulus of the outer diaphragm and the inner diaphragm is between 0.5 - 10 MPa. The surfaces of the outer diaphragm and the inner diaphragm are both sprayed with a PTFE coating.

[0013] Preferably, the outer shape of the baffle is conical, with a small diameter at the upper end and a large diameter at the lower end, and the bottom of the lower end is arc-shaped.

[0014] Preferably, the material of the L-shaped lever is 316L stainless steel and its surface is polished.

[0015] Preferably, the anti-blocking mechanism includes a semi-circular block installed on the bottom outer wall of the third hollow tube. An installation groove is opened inside the semi-circular block. The top of the installation groove is communicated with the inside of the third hollow tube. The baffle is slidably connected to the installation groove.

[0016] Preferably, two arc-shaped pieces are arranged inside the third hollow tube. The two arc-shaped pieces and the inner wall of the adjacent installation groove are elastically connected by three springs respectively. Both of the two arc-shaped pieces are in contact with the outer wall of the baffle.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The present invention realizes intelligent response and dynamic adjustment to negative pressure changes by designing the area difference between the outer diaphragm and the inner diaphragm and the leverage ratio of the L-shaped lever. When the negative pressure increases, the outer diaphragm depresses inward, magnifies the force through the L-shaped lever, drives the baffle to move upward, reduces the annular gap, and decreases the flow rate. On the contrary, when the negative pressure decreases, the outer diaphragm expands outward, also magnifies the force through the L-shaped lever, drives the baffle to move downward, increases the annular gap, and increases the flow rate. This enables the device to automatically adjust the flow rate according to the actual needs during the surgical process, ensuring stable and efficient suction effect. In addition, through the setting of the preloading spring, the stability of the inner diaphragm is further enhanced, avoiding mis-triggering and improving the reliability of the device.

[0019] The present invention sets up an anti-blocking mechanism with components such as semi-circular blocks, installation grooves, arc-shaped pieces, and springs. When the baffle is adjusted in the vertical direction, the arc-shaped piece can closely adhere to the outer wall of the baffle, forming a barrier that effectively prevents impurities from entering the interior of the installation groove, thus avoiding the occurrence of blockage problems. At the same time, the elastic connection between the arc-shaped piece and the inner wall of the installation groove through the spring enhances the structural stability, enabling the arc-shaped piece to deform moderately according to the actual situation to adapt to different position states of the baffle. In addition, both the outer diaphragm and the inner diaphragm are made of medical-grade silicone material and sprayed with a PTFE coating, which improves the smoothness and wear resistance of the diaphragm surface and extends the service life.

[0020] Through the design of the area difference between the outer diaphragm and the inner diaphragm and the leverage ratio of the L-shaped lever, the present invention enables the device to amplify the pressure signal and improve the transmission efficiency, thereby achieving more precise control of the flow rate. At the same time, due to the use of high-quality materials such as medical-grade silicone, the elasticity and durability of the diaphragm are guaranteed, enabling the device to maintain stable performance during long-term use. In addition, the device also has a short response time and can respond to negative pressure changes within an extremely short time, ensuring stable and reliable suction effect during the surgical process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is a schematic side structural diagram of the present invention;

[0023] Figure 3 is a schematic front sectional structural diagram of the feedback pressure cavity, hollow tube one, hollow tube two, and hollow tube three of the present invention;

[0024] Figure 4 is a schematic front sectional structural diagram of the feedback pressure cavity of the present invention;

[0025] Figure 5 is a schematic structural diagram of the linkage adjustment mechanism of the present invention;

[0026] Figure 6 Schematic diagram of the partial side sectional structure of the semi-circular block of the present invention;

[0027] Figure 7 Schematic diagram of the semi-circular block and installation groove structure of the present invention;

[0028] Figure 8 Schematic diagram of the explosion structure of the anti-blocking mechanism of the present invention.

[0029] In the figure: 1, feedback pressure cavity; 101, circular ring piece; 102, hollow tube one; 103, hollow tube two; 104, fixed block; 2, outer diaphragm; 3, inner diaphragm; 4, preloading spring; 5, L-shaped lever; 6, baffle; 7, hollow tube three; 701, semi-circular block; 7011, installation groove; 8, arc-shaped piece; 9, spring. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figures 1 to 8 shown, the present invention provides a medical surgical aspirator, including a feedback pressure cavity 1. A hollow tube two 103 is installed at the bottom of the feedback pressure cavity 1. A hollow tube one 102 is installed on the side of the feedback pressure cavity 1. A hollow tube three 7 is installed at the bottom of the hollow tube two 103. A linkage adjustment mechanism is arranged inside the feedback pressure cavity 1. An anti-blocking mechanism is arranged inside the hollow tube three 7;

[0032] The linkage adjustment mechanism includes an outer diaphragm 2 installed on the side of the feedback pressure cavity 1. An inner diaphragm 3 is installed inside the feedback pressure cavity 1. A fixed block 104 is installed on the bottom inner wall of the feedback pressure cavity 1. An L-shaped lever 5 is installed inside the fixed block 104. The L-shaped lever 5 and the fixed block 104 are located between the outer diaphragm 2 and the inner diaphragm 3. The long arm end of the L-shaped lever 5 is hinged to the inner diaphragm 3. The short arm end of the L-shaped lever 5 naturally vertically faces downward and is provided with a baffle 6. The baffle 6 extends into the hollow tube three 7.

[0033] Through the design of the area difference between the outer diaphragm 2 and the inner diaphragm 3, the device can adapt to different ranges of negative pressure changes. When the negative pressure increases, such as when the pipeline suddenly becomes unobstructed, the outer diaphragm 2 is indented inward under the action of the negative pressure, generating a downward force F1. This force is amplified to 2F1 through the 2:1 lever ratio of the L-shaped lever 5, thereby driving the baffle 6 to move upward, reducing the annular gap and decreasing the flow rate. On the contrary, when the negative pressure decreases, such as when encountering tissue blockage, the outer diaphragm 2 expands outward, generating an upward force F2. Similarly, after being amplified by the L-shaped lever 5, it drives the baffle 6 to move downward, increasing the annular gap and increasing the flow rate. The surface of the baffle 6 is laser engraved with spiral flow guiding grooves, and the rotating air flow can strip the attachments.

[0034] As Figures 3 to 4 shown, a circular ring piece 101 is installed on the inner wall of the feedback pressure cavity 1, and the circular ring piece 101 is elastically connected to the inner diaphragm 3 through a preloading spring 4.

[0035] By setting the preloading spring 4, it is ensured that the inner diaphragm 3 remains flat without negative pressure, avoiding mis-triggering. When negative pressure acts on the inner diaphragm 3, the preloading spring 4 provides a reverse force to achieve dynamic adjustment.

[0036] As Figure 4 shown, the length value of the upper arm end of the L-shaped lever 5 is 20 mm, the length value of the short arm end of the L-shaped lever 5 is 10 mm, and the lever ratio of the L-shaped lever 5 is 2:1.

[0037] By designing the lever ratio of the L-shaped lever 5 to be 2:1, when a unit force acts on the upper arm end, the short arm end will generate a torque change twice that of the unit force. This not only improves the transmission efficiency of the L-shaped lever 5 but also enables it to respond more sensitively to changes in external driving forces, thereby achieving more precise control of the connected components or fluid channels.

[0038] As Figure 5 shown, the diameter value of the outer diaphragm 2 is 30 mm, the thickness is 0.5 mm, the diameter value of the inner diaphragm 3 is 15 mm, and the thickness value is 0.5 mm.

[0039] By setting the diameter value of the outer diaphragm 2 to 30 mm and the diameter value of the inner diaphragm 3 to 15 mm, the area difference between the outer diaphragm 2 and the inner diaphragm 3 is 4:1. Through the 2:1 lever ratio of the L-shaped lever 5, an 8-fold pressure signal amplification is achieved, making the response time < 0.1 second.

[0040] As Figure 4 shown, the preloading spring 4 is in a slightly compressed state in the initial state, and the compression amount of the preloading spring 4 is 1 mm.

[0041] By setting the compression amount of the preloading spring 4 to 1 mm, a pre-tightening force is established between the preloading spring 4 and the inner diaphragm 3 connected thereto, ensuring that the inner diaphragm 3 remains flat without negative pressure and avoiding mis-triggering.

[0042] As Figures 4 to 5 shown, the materials of the outer diaphragm 2 and the inner diaphragm 3 are both medical-grade silicone. The elastic moduli of the outer diaphragm 2 and the inner diaphragm 3 are between 0.5 - 10 MPa, and PTFE coatings are sprayed on the surfaces of the outer diaphragm 2 and the inner diaphragm 3.

[0043] By controlling the elastic moduli of the outer diaphragm 2 and the inner diaphragm 3 between 0.5 - 10 MPa, it is ensured that the outer diaphragm 2 and the inner diaphragm 3 can undergo appropriate elastic deformation when subjected to external forces, thus effectively responding to pressure changes. Also, it ensures that the outer diaphragm 2 and the inner diaphragm 3 can maintain stable shapes and properties during long-term use, and are not prone to permanent deformation or rupture. By spraying a layer of PTFE (polytetrafluoroethylene) coating on the surfaces of the outer diaphragm 2 and the inner diaphragm 3, the smoothness and wear resistance of the diaphragm surfaces are improved, reducing friction and wear, and also helping to prevent the erosion of the diaphragm surfaces by corrosive substances in liquids or gases, thereby extending the service lives of the outer diaphragm 2 and the inner diaphragm 3.

[0044] As Figures 7 to 8 shown, the outer shape of the baffle 6 is conical, with a smaller diameter at the upper end and a larger diameter at the lower end, and the bottom of the lower end is arc-shaped.

[0045] By changing the vertical height of the baffle 6, the dynamic adjustment of the annular gap between the baffle 6 and the hollow tube three 7 is achieved. Through the change of the annular gap, the cross-sectional area of the fluid passage inside the hollow tube three 7 is affected. Specifically, when the vertical height of the baffle 6 increases, the annular gap between it and the inner wall of the hollow tube three 7 gradually decreases, resulting in a corresponding reduction in the cross-sectional area of the fluid passage, which helps to slow down the fluid flow speed when needed. On the contrary, when the vertical height of the baffle 6 decreases, the annular gap increases, and the cross-sectional area of the fluid passage also expands, thereby allowing more fluid to pass through smoothly and improving the fluid flow efficiency. Since the baffle 6 is designed to be conical, its movement in the vertical direction not only changes the size of the annular gap but also maintains uniform contact with the inner wall of the hollow tube three 7. This characteristic ensures the continuity and stability of the change in the cross-sectional area of the fluid passage, avoiding fluid disturbance or pressure fluctuation caused by uneven gaps.

[0046] As Figures 4 to 5 shown, the material of the L-shaped lever 5 is 316L stainless steel, and its surface is polished.

[0047] By using 316L stainless steel as the main material of the L-shaped lever 5, 316L stainless steel has corrosion resistance, high strength and good mechanical properties. The surface of the L-shaped lever 5 is polished, which not only improves the appearance texture of the L-shaped lever 5, makes it smoother, effectively reduces the surface roughness, and lowers the friction coefficient, thus contributing to the smooth movement and reduced wear of the L-shaped lever 5 during operation.

[0048] As Figures 7 to 8 shown, the anti-blocking mechanism includes a semi-circular block 701 installed on the outer wall of the bottom of the hollow tube three 7. An installation groove 7011 is formed inside the semi-circular block 701. The top of the installation groove 7011 is communicated with the inside of the hollow tube three 7, and the baffle 6 is slidably connected to the installation groove 7011.

[0049] By forming an installation groove 7011 inside the semi-circular block 701, the top of this installation groove 7011 is communicated with the inside of the hollow tube three 7, forming a channel, thereby allowing the baffle 6 to move up and down flexibly within the installation groove 7011. The sliding connection mode of the baffle 6 with the installation groove 7011 enables the baffle 6 to adjust its position according to actual needs to effectively block or allow the fluid to pass through.

[0050] As Figure 7 shown, two arc-shaped pieces 8 are arranged inside the hollow tube three 7. The two arc-shaped pieces 8 are elastically connected to the inner walls of the adjacent installation grooves 7011 through three springs 9 respectively, and both of the two arc-shaped pieces 8 are in contact with the outer wall of the baffle 6.

[0051] By arranging two arc-shaped pieces 8, when the baffle 6 is under pressure and makes flexible adjustment in the vertical direction, these two arc-shaped pieces 8 can closely fit on the outer wall of the baffle 6, forming a barrier to prevent impurities from entering the inside of the installation groove 7011, thus ensuring the cleanliness and stability of the system. In addition, the elastic connection between the arc-shaped pieces 8 and the inner walls of the installation grooves 7011 through the springs 9 not only enhances the structural stability, but also enables the arc-shaped pieces 8 to deform moderately according to the actual situation to adapt to different position states of the baffle 6, further improving the sealing effect and the durability of the system.

[0052] The working principle and usage process of the present invention:

[0053] Device installation: The medical surgical aspirator device is installed in the negative pressure regulation module of the negative pressure device, located between the suction pipeline and the liquid storage bottle;

[0054] The outer diaphragm 2 has a diameter of 30 mm and an area of 706.5 mm 2 : It is flattened and unfolded, without being affected by negative pressure,

[0055] The inner diaphragm 3 has a diameter of 15 mm and an area of 176.7 mm 2:Flat and unfolded, the preloaded spring 4 is in a slightly compressed state with a compression amount of about 1 mm;

[0056] Baffle 6: The baffle 6 is located in the third hollow tube 7 and forms a 2-mm annular gap with the third hollow tube 7, allowing the maximum flow rate to pass through;

[0057] I. When the negative pressure increases, such as when the pipeline suddenly becomes unblocked

[0058] Response of the outer diaphragm 2: It is recessed inward under the action of negative pressure, generating a downward force F1 = P × A1; Amplification by the L-shaped lever 5: Through the lever mechanism with a lever ratio of 2:1, the force is amplified to 2F1; Movement of the baffle 6: The amplified force drives the baffle 6 to move upward; Flow regulation: The upward movement of the baffle 6 causes the annular gap to decrease, reducing the cross-sectional area of the fluid passage, thereby reducing the flow rate; Balance of the inner diaphragm 3: The inner diaphragm 3 generates a reverse displacement under the action of the preloaded spring 4 to balance the negative pressure.

[0059] II. When the negative pressure decreases, such as when encountering a tissue blockage

[0060] Response of the outer diaphragm 2, generating an upward force F2 = P × A2; Similarly, through the lever mechanism of the L-shaped lever 5, the force is amplified to 2F2; The amplified force drives the baffle 6 to move downward; The downward movement of the baffle 6 causes the annular gap to increase, expanding the cross-sectional area of the fluid passage, thereby increasing the flow rate.

[0061] Through the area difference of the double diaphragms (4:1) combined with the lever mechanism (2:1), an 8-fold amplification of the pressure signal is achieved. Using a pure mechanical structure, the response time is < 0.1 second, far exceeding that of traditional electronic control valves, enabling rapid adjustment of negative pressure when encountering sudden blockages or flow rate changes during surgery, avoiding blurred vision or tissue damage.

[0062] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0063] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made therein without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medical surgical aspirator, comprising a feedback pressure cavity (1), characterized in that: A hollow tube two (103) is installed at the bottom of the feedback pressure cavity (1), a hollow tube one (102) is installed on the side of the feedback pressure cavity (1), a hollow tube three (7) is installed at the bottom of the hollow tube two (103), a linkage adjustment mechanism is arranged inside the feedback pressure cavity (1), and an anti-blocking mechanism is arranged inside the hollow tube three (7); The linkage adjustment mechanism includes an outer diaphragm (2) installed on the side of the feedback pressure cavity (1), an inner diaphragm (3) is installed inside the feedback pressure cavity (1), a fixing block (104) is installed on the bottom inner wall of the feedback pressure cavity (1), an L-shaped lever (5) is installed inside the fixing block (104), the L-shaped lever (5) and the fixing block (104) are located between the outer diaphragm (2) and the inner diaphragm (3), the long arm end of the L-shaped lever (5) is hinged to the inner diaphragm (3), the short arm end of the L-shaped lever (5) naturally vertically faces downwards and is provided with a baffle (6), and the baffle (6) extends into the hollow tube three (7).

2. The medical surgical aspirator according to claim 1, characterized in that: A circular ring piece (101) is installed on the inner wall of the feedback pressure cavity (1), and the circular ring piece (101) is elastically connected with the inner diaphragm (3) through a preloading spring (4).

3. The medical surgical aspirator according to claim 1, characterized in that: The length value of the upper arm end of the L-shaped lever (5) is 20 mm, the length value of the short arm end of the L-shaped lever (5) is 10 mm, and the lever ratio of the L-shaped lever (5) is 2:

1.

4. The medical surgical aspirator according to claim 1, wherein: The diameter value of the outer diaphragm (2) is 30 mm and the thickness is 0.5 mm, the diameter value of the inner diaphragm (3) is 15 mm and the thickness value is 0.5 mm.

5. The medical surgical aspirator according to claim 2, wherein: The preloading spring (4) is in a slightly compressed state under the initial state, and the compression amount of the preloading spring (4) is 1 mm.

6. The medical surgical aspirator according to claim 1, wherein: The materials of the outer diaphragm (2) and the inner diaphragm (3) are both medical silica gel, the elastic modulus of the outer diaphragm (2) and the inner diaphragm (3) is between 0.5 - 10 MPa, and PTFE coatings are sprayed on the surfaces of the outer diaphragm (2) and the inner diaphragm (3).

7. The medical surgical aspirator according to claim 1, wherein: The outer shape of the baffle (6) is conical, the upper end diameter is small, the lower end diameter is large, and the bottom of the lower end is arc-shaped.

8. The medical surgical aspirator according to claim 1, wherein: The material of the L-shaped lever (5) is 316L stainless steel and the surface is polished.

9. The medical surgical aspirator according to claim 1, characterized in that: The anti-blocking mechanism includes a semi-circular block (701) installed on the bottom outer wall of the hollow tube three (7), an installation groove (7011) is opened inside the semi-circular block (701), the top of the installation groove (7011) is communicated with the inside of the hollow tube three (7), and the baffle (6) is slidably connected with the installation groove (7011).

10. The medical surgical aspirator according to claim 9, characterized in that: Two arc-shaped pieces (8) are arranged inside the hollow tube three (7), the two arc-shaped pieces (8) are elastically connected with the inner walls of the adjacent installation grooves (7011) through three springs (9) respectively, and the two arc-shaped pieces (8) are both in contact with the outer wall of the baffle (6).

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