A tool shank sealing structure

Abstract

The present invention relates to a knife rod sealing structure, comprising a knife rod, the knife rod comprising a tail portion of a coaxial centerline connected in sequence to form a cylindrical shape, a first coupling region, a thick-thin alternating region, and a second coupling region, wherein the thick-thin alternating region is composed of cylinders of different diameters alternating with each other, a first sealing ring being detachably mounted on the first coupling region, a second sealing ring being detachably mounted on the second coupling region, and a sealing assembly being mounted on the thick-thin alternating region, the sealing assembly comprising two connected third sealing rings and an O-ring being detachably mounted between the two third sealing rings, a sealing ring protrusion being axially extending around the third sealing ring on one end face of the third sealing ring, the inner diameter of the sealing ring protrusion being larger than the inner diameter of the third sealing ring, and the two third sealing rings being fixedly mounted on the thick-thin alternating region and connected in such a manner that the sealing ring protrusions face each other. This invention solves the problem of airtightness between the knife rod and the inner tube in an ultrasonic knife and can achieve the function of reusing the knife rod.

Description

Technical Field

[0001] The invention relates to medical equipment, in particular to a knife rod sealing structure. Background Art

[0002] Ultrasonic scalpels have proven effective clinically and have become an essential tool for clinical surgery. However, they also present challenges. The airtight structure of the blade tube assembly in existing ultrasonic scalpels is achieved by injecting soft rubber into the blade shaft in sections. However, due to the characteristics of the soft rubber, this structure cannot be cleaned, disinfected, or sterilized for reuse, resulting in a waste of resources and increased costs. Summary of the Invention

[0003] In view of the existing deficiencies, the present invention provides a knife rod sealing structure.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a tool rod sealing structure, including a tool rod, the tool rod includes a tail of a coaxial centerline connected in sequence into a cylindrical shape, a first coupling area, a coarse and thin alternating area and a second coupling area, the coarse and thin alternating area is composed of cylinders of different diameters alternating, a first sealing ring is detachably mounted on the first coupling area, a second sealing ring is detachably mounted on the second coupling area, a sealing assembly is mounted on the coarse and thin alternating area, the sealing assembly includes two connected third sealing rings and an O-ring detachably arranged between the two third sealing rings, a sealing ring protrusion is provided on one end face of the third sealing ring along its axial direction and around the third sealing ring, the inner diameter of the sealing ring protrusion is larger than the inner diameter of the third sealing ring, and the two third sealing rings are fixedly mounted on the coarse and thin alternating area and connected in a manner that the sealing ring protrusions are opposite to each other.

[0005] Preferably, the sealing ring protrusion is a protrusion extending axially from the outer edge of the third sealing ring.

[0006] Preferably, the sealing ring is raised into a wave-shaped structure and has a plurality of wave crests in radially symmetrical positions.

[0007] Preferably, an inner wall groove surrounding the second sealing ring is provided on the inner side wall of the second sealing ring, and a tool rod protrusion radially surrounding the tool rod is provided on the second coupling area and capable of interference fit with the inner wall groove.

[0008] Preferably, the first sealing ring is provided with sealing ring through holes penetrating the side wall of the first sealing ring at two radially symmetrical positions, and the first coupling area is provided with a tool rod through hole penetrating the side wall of the tool rod in the radial direction, and a stop shaft in an I-shaped structure is installed in the tool rod through hole, with both ends extending out of the tool rod through hole and the diameters of both ends being larger than the diameter of the tool rod through hole. The first sealing ring is sleeved on the tool rod and the two ends of the stop shaft correspondingly pass through the two sealing ring through holes.

[0009] Preferably, an outer wall groove spaced apart from the sealing ring through hole is further provided on the outer wall of the first sealing ring along the circumference of the first sealing ring.

[0010] Preferably, the diameters of all coarse structures in the coarse-fine alternating region are equal, and the diameters of all fine structures are also equal.

[0011] Preferably, both the first coupling region and the second coupling region are connected to the coarse structure in the coarse-fine alternating region.

[0012] Preferably, the front end of the second coupling region is further connected to a cutter head.

[0013] Preferably, a rounded transition zone is provided between the coarse structure and the fine structure in the coarse-fine alternating zone.

[0014] The beneficial effects of the present invention are: the invention adopts three different detachable sealing structures in the three areas of the knife rod, which effectively prevents leakage, and the O-ring is arranged between the two third sealing rings. The installation structure of the two third sealing rings on the knife rod forms a sealing groove inside, and the O-ring is installed in the sealing groove, which can not only fix its position, but also prevent it from being brought out of the third sealing ring when the knife tube assembly slides. When the knife tube assembly is inserted, the O-ring is compressed and deformed and tightly fits with the inner wall of the knife tube assembly to play a sealing role. At the same time, the O-ring can also be replaced by pressing the bulge of the sealing ring, thereby achieving the purpose of reusing the knife rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of an embodiment of the present invention;

[0016] Figure 2 This is a schematic structural diagram of two third sealing rings arranged opposite to each other in an embodiment of the present invention;

[0017] Figure 3 2. It is a schematic structural diagram of an O-type sealing ring according to an embodiment of the present invention;

[0018] Figure 4 is a schematic structural diagram of the second sealing ring according to an embodiment of the present invention;

[0019] Figure 5 1 is a schematic structural diagram of a first sealing ring according to an embodiment of the present invention;

[0020] Figure 6 This is a schematic structural diagram of a stop shaft according to an embodiment of the present invention;

[0021] The names and serial numbers of the parts in the figure are: 1- knife rod 10- tail 11- first coupling area 12- thick and thin alternating area 13- second coupling area 14- rounded transition area 2- first sealing ring 20- sealing ring through hole 21- outer wall groove 3- second sealing ring 30- inner wall groove 4- sealing assembly 40- third sealing ring 41- O-ring 400- sealing ring protrusion 5- anti-rotation shaft 6- knife head. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments for a clear and complete description. Obviously, the embodiments described are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only references to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limitations on the present invention.

[0023] The present invention is implemented as follows Figures 1 to 6As shown in, a knife rod sealing structure includes a knife rod 1, and the knife rod 1 includes a tail portion 10 of a coaxial centerline in a cylindrical shape, a first coupling area 11, a coarse and thin alternating area 12 and a second coupling area 13 connected in sequence. Each part is integrally formed, and from back to front, they are the tail portion 10, the first coupling area 11, the coarse and thin alternating area 12 and the second coupling area 13 used to connect the transducer. The coarse and thin alternating area 12 resonates with the sound wave and transfers energy to the knife head 6 connected to the front end of the second coupling area 13, so that the knife head 6 generates strong vibration, and the coarse and thin structure helps to increase the longitudinal vibration and weaken the lateral vibration, so that the knife head 6 works more stably and enhances the cutting effect of the ultrasonic knife. The first coupling area 11 plays the role of transition conduction to avoid excessive stress on the knife rod 1. The problem of breakage occurs, the second coupling area 13 is used to connect the blade head 6, that is, the front end of the second coupling area 13 is connected to the blade head 6 to prevent the blade rod 1 from colliding with the wall of the surgical knife tube due to excessive amplitude during work, and the coarse and fine alternating area 12 is composed of cylinders of different diameters, wherein the lengths of the coarse structure and the fine structure are set accordingly according to the use requirements. The diameters of all coarse structures in the coarse and fine alternating area 12 are equal, and the diameters of all fine structures are also equal, ensuring that the vibration of the blade head 6 reaches the optimal level, improving the cutting effect of the ultrasonic knife, and reducing energy loss. It is preferred to control the diameter difference between them within 0.3mm, so that there will be no excessive stress between the two due to the large diameter difference, which will lead to the problem of blade breakage. A rounded transition zone 14 is provided between the coarse structure and the fine structure in the alternating zone 12, which makes the tool rod 1 smoother when vibrating, reduces the stress at the connection between the coarse and fine structures, and avoids the problem of the tool rod 1 being broken by stress. A first sealing ring 2 is detachably provided on the first coupling zone 11, that is, the first sealing ring 2 is detachably provided on the first coupling zone 11 of the tool rod 1 and is positioned at the provided position at the same time, so that it cannot move, thereby avoiding falling off during use, and facilitating the replacement of the first sealing ring 2. A second sealing ring 3 is detachably provided on the second coupling zone 13. Similarly, the second sealing ring 3 is also first provided on the second coupling zone 13 and then positioned, so as to maintain the stable installation of the second sealing ring 3 and avoid falling off during use. A sealing ring 2 is provided on the coarse and fine alternating zone 12 The sealing assembly 4 has multiple sealing structures distributed at intervals on the knife rod 1, which supports the knife rod 1 in the internal space balance of the knife tube assembly while achieving good sealing, closing the annular space between the knife rod 1 and the knife tube to achieve a sealing effect. The knife tube assembly slides during use, and there is a certain amount of air flow in the annular space inside the tube. When the knife tube assembly is immersed in liquid, the sealing structure on the knife rod 1 will prevent part of the liquid or contaminant particles from flowing back into the tube cavity. The sealing assembly 4 includes two connected third sealing rings 40 and an O-ring 41 arranged between the two third sealing rings 40. The two third sealing rings 40 have the same structure, both of which are annular structures. The O-ring 41 is arranged between the two third sealing rings 40, and they are connected to each other.In this way, both the front and rear ends of the O-ring 41 are blocked by a third sealing ring 40. A sealing ring protrusion 400 is extended along its axial direction on one end face of the third sealing ring 40 and surrounds the third sealing ring 40. That is, the sealing ring protrusion 400 is also an annular structure, which is located on the end face of the third sealing ring 40. At this time, the inner diameter of the sealing ring protrusion 400 is larger than the inner diameter of the third sealing ring 40, which means that a step-like structure is formed between the inner ring of the sealing ring protrusion 400 and the inner ring of the third sealing ring 40. The two third sealing rings 40 are fixedly sleeved on the coarse and fine alternating area 12 in a manner that the sealing ring protrusions 400 are opposite to each other. The two third sealing rings 40 are mounted on the tool rod 1 and are connected, that is, the two third sealing rings 40 are both mounted on the tool rod 1 and fixed, and the sealing ring protrusion 400 on one third sealing ring 40 faces the sealing ring protrusion 400 on the other third sealing ring 40, and the two sealing ring protrusions 400 are connected. In this way, after the two third sealing rings 40 are mounted on the tool rod 1, an accommodating space is formed between the inner rings of the two sealing ring protrusions 400 and the outer wall of the tool rod 1. This space is used to install the O-ring 41. When the tool rod 1 is inserted into the tool tube assembly, the sealing ring protrusion 400 on the third sealing ring 40 can prevent the O-ring 41 from being brought out of the third sealing ring 40. In this way, the problem of airtightness of the annular space formed by the tool rod 1 and the inner tube in the sealed tool tube assembly is solved, and the function of reusing the tool rod 1 can be achieved. This structure constitutes an extrusion-type sealing structure, which relies on the elastic deformation of the O-ring 41. Its contact pressure is greater than the internal pressure of the sealed tool tube assembly, which effectively prevents leakage.

[0024] Further improvements, such as Figures 1 to 3As shown in the figure, the sealing ring protrusion 400 is a protrusion extending axially from the outer edge of the third sealing ring 40, which ensures that there will be no steps at the position of the outer ring of the third sealing ring 40, and it can also form a good seal after the knife bar 1 is installed in the knife tube, maintaining a good sealing effect. The sealing ring protrusion 400 is in a wavy structure and has multiple wave crests in radially symmetrical positions, such as two wave crests, which means that the sealing ring protrusion 400 is in an ups and downs state in the circumferential direction. If there is a wave crest structure on one side, there is another wave crest structure in a radially symmetrical position. The two wave crests are centrally symmetrical. In this way, when the two third sealing rings 40 are connected, they can be connected at the wave crest position, or the wave crest on one third sealing ring 40 can correspond to the wave trough position on the other third sealing ring 40, so that the O-ring 41 can be better installed between the two third sealing rings 40. At this time, the two third sealing rings 40 can be connected by abutting or fixed connection at the inner ring, such as the two third sealing rings 40 are connected to the knife bar 1. After being fixed together through injection molding in the mold, the two third sealing rings 40 are in abutment with each other at the position of the outer ring. When the O-ring 41 needs to be installed, the sealing ring protrusion 400 is squeezed to deform it, and then the O-ring 41 is inserted into the accommodating cavity formed between the two sealing ring protrusions 400 and the knife rod 1. When the knife tube assembly is inserted, the compression deformation closely cooperates with the inner wall of the knife tube assembly to play a sealing role. In this way, the O-ring 41 is installed and its position is fixed. At the same time, when the knife tube assembly slides, the O-ring 41 will not be brought out of the accommodating cavity. When the O-ring 41 needs to be replaced, it can be manually squeezed to separate the outer rings of the two third sealing rings 40 and the O-ring 41 can be taken out, so that the knife rod 1 can be reused.

[0025] Further improvements, such as Figure 1 and Figure 4 As shown in the figure, an inner wall groove 30 is provided on the inner side wall of the second sealing ring 3, and a knife rod protrusion is provided on the second coupling area 13, which is radially around the knife rod 1 and can be interference fit with the inner wall groove 30. The interference fit will not prevent the second sealing ring 3 from falling off during repeated use. At the same time, the thickness of the second sealing ring 3 corresponding to the two sides of the inner wall groove 30 can be the same thickness or one side is thicker and the other side is thinner according to actual needs of use, which can better cooperate with the knife rod 1, improve the output of vibration energy, and enhance the cutting effect.

[0026] Further improvements, such as Figure 1 and Figure 5 、 Figure 6As shown in, the first sealing ring 2 is provided with sealing ring through holes 20 penetrating the side wall of the first sealing ring 2 at two radially symmetrical positions, that is, the sealing ring through holes 20 are provided on the first sealing ring 2, and are symmetrical at both ends in the same radial direction, and the first coupling area 11 is provided with a tool rod through hole penetrating the side wall of the tool rod 1 in the radial direction, the tool rod through hole is provided in the first coupling area 11 of the tool rod 1, and is penetrating the side wall of the tool rod 1, and a stop shaft 5 with an I-shaped structure with both ends extending out of the tool rod through hole and a diameter greater than the diameter of the tool rod through hole is installed in the tool rod through hole, the first sealing ring 2 is sleeved on the tool rod 1 and the two ends of the stop shaft 5 correspondingly pass through the two sealing ring through holes 20, that is, the stop shaft 5 is rotated on the tool rod In the through hole, the parts at both ends of the stop shaft 5 that are larger than the diameter of the tool rod through hole act as blocks, so that the stop shaft 5 will not fall out of the tool rod through hole. During production, the tool rod 1 and the stop shaft 5 can be fixed by in-mold injection molding. When in use, first put the first sealing ring 2 on the tool rod 1, and then move it to the position of the stop shaft 5, so that the two ends of the stop shaft 5 pass through the two sealing ring through holes 20 accordingly, and the first sealing ring 2 is fixed in the first coupling area 11. After inserting the knife tube assembly, the two ends of the stop shaft 5 will be connected to the inner wall of the catheter assembly and thus fixed. Such a structure reduces the impedance in the performance parameters of the tool rod 1, and the in-mold injection molding process can effectively tighten the stop shaft 5 and the tool rod 1, and no loosening or displacement will occur during repeated use. An outer wall groove 21 spaced apart from the sealing ring through hole 20 is further provided on the outer wall of the first sealing ring 2 along the circumference of the first sealing ring 2, that is, an outer wall groove 21 is provided between two adjacent sealing ring through holes 20. When the knife tube assembly is inserted, the end face of the groove wall of the outer wall groove 21 forms multiple contact surfaces with the inner wall of the knife tube, thereby improving the sealing performance and making the connection between the knife rod 1 and the knife tube assembly more firmly.

[0027] Further improvements, such as Figure 1 As shown in the figure, the first coupling area 11 and the second coupling area 13 are both connected to the coarse structure in the coarse-thin alternating area 12, so that the stress between the coupling area and the coarse-thin alternating area will not be too large, the diameter difference is established, and the fracture of the tool rod is effectively reduced.

[0028] It should be understood that those skilled in the art may make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A tool bar sealing structure, characterized in that: The invention comprises a tool rod, which comprises a tail portion of a coaxial centerline connected in sequence into a cylindrical shape, a first coupling area, a coarse-thin alternating area and a second coupling area, wherein the coarse-thin alternating area is composed of cylinders of different diameters alternatingly, a first sealing ring is detachably mounted on the first coupling area, a second sealing ring is detachably mounted on the second coupling area, a sealing assembly is mounted on the coarse-thin alternating area, the sealing assembly comprises two connected third sealing rings and an O-ring detachably arranged between the two third sealing rings, a sealing ring protrusion is provided on one end face of the third sealing ring along its axial direction and around the third sealing ring, the inner diameter of the sealing ring protrusion is larger than the inner diameter of the third sealing ring, and the two third sealing rings are fixedly mounted on the coarse-thin alternating area and connected in a manner that the sealing ring protrusions are opposite to each other.

2. The tool rod sealing structure according to claim 1, characterized in that : The sealing ring protrusion is a protrusion extending axially from the outer edge of the third sealing ring.

3. The tool rod sealing structure according to claim 1, characterized in that The sealing ring is raised into a wave-shaped structure and has a plurality of wave crests in radially symmetrical positions.

4. The tool rod sealing structure according to claim 1, characterized in that : An inner wall groove is provided on the inner side wall of the second sealing ring and surrounds the second sealing ring, and a tool rod protrusion is provided on the second coupling area and surrounds the tool rod in the radial direction and can be interference fit with the inner wall groove.

5. The tool rod sealing structure according to claim 1, characterized in that : The first sealing ring is provided with sealing ring through holes penetrating the side wall of the first sealing ring at two radially symmetrical positions, and the first coupling area is provided with a tool rod through hole penetrating the side wall of the tool rod in the radial direction, and the tool rod through hole is provided with an I-shaped anti-rotation shaft with two ends extending out of the tool rod through hole and the diameters of both ends being larger than the diameter of the tool rod through hole. The first sealing ring is sleeved on the tool rod and the two ends of the anti-rotation shaft pass through the two sealing ring through holes accordingly.

6. The tool rod sealing structure according to claim 5, characterized in that An outer wall groove spaced apart from the sealing ring through hole is also provided on the outer wall of the first sealing ring along the circumference of the first sealing ring.

7. The tool rod sealing structure according to claim 1, characterized in that : The diameters of all coarse structures in the coarse-fine alternating zone are equal, and the diameters of all fine structures are also equal.

8. The tool rod sealing structure according to claim 1, characterized in that The first coupling region and the second coupling region are both connected to the coarse structure in the coarse-fine alternating region.

9. The tool rod sealing structure according to claim 1, characterized in that :The front end of the second coupling area is also connected to a cutter head.

10. The tool rod sealing structure according to claim 1, characterized in that : In the coarse and fine alternating areas, a rounded transition area is provided between the coarse structure and the fine structure.

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