A short-range open ultrasonic surgical knife central rod

Abstract

The present invention belongs to the field of medical device technology, and in particular relates to a short-range open ultrasonic scalpel center rod. The present invention comprises a scalpel body, on which a first center rod segment, a second center rod segment, a third center rod segment, a fourth center rod segment, a fifth center rod segment, and a sixth center rod segment are provided. The sixth center rod segment is connected to the scalpel body, the first center rod segment is provided with a primary amplitude amplification structure, the second center rod segment is provided with an amplitude reduction control structure, the third center rod segment is provided with a slowdown transition structure, and the fourth center rod segment is provided with an amplitude expansion structure. The present invention is applied to open abdominal surgery, using a short-range center rod. By providing a primary amplitude amplification structure, an amplitude reduction control structure, a slowdown transition structure, an amplitude expansion structure, a conduction structure, and a high-amplitude output structure, the center rod emission response is reduced by 8 to 12 dB, thereby significantly reducing the center static impedance and achieving instantaneous tissue dehydration and coagulation.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices and relates to a short-range open ultrasonic scalpel center rod. Background Art

[0002] Ultrasonic surgical knife equipment is generally composed of a main unit, a transducer, a center rod, and operating mechanical accessories. It is mainly composed of three core components: the main unit, the transducer, and the center rod. Among them, the main unit generates a high-frequency drive signal, and the transducer converts the high-frequency drive signal into high-frequency mechanical vibration. The high-frequency mechanical vibration is then transmitted to the blade part at the tip of the center rod through the center rod. The vibration energy is amplified by the designed center rod structure, and finally the blade part produces high-amplitude high-frequency vibration to achieve the purpose of use. In specific surgical scenarios corresponding to open surgery, a short-range center rod is required as a surgical tool. The requirements for the emission response of the center rod are high. During use, the existing short-range center rod has problems such as uneven energy distribution and stress dispersion under high-frequency and high-amplitude output. It is difficult to achieve the effect of reducing the emission response of the center rod by 8 to 12dB. The stress and structural impedance at the transition between the blade rods vary greatly, and the energy and stress of the center rod are uneven.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses an ultrasonic surgical scalpel shaft, an ultrasonic scalpel handle, and a surgical instrument [Application Number: 201921215046.X]. The ultrasonic surgical scalpel shaft is provided with a pin hole. In a cross section passing through the center point of the pin hole, the ratio of the height of the pin hole to the height of the ultrasonic surgical scalpel shaft is less than or equal to a preset ratio value. However, this solution is not suitable for the specific surgical scenario corresponding to open surgery. During use, it still suffers from problems such as uneven energy distribution and stress dispersion under high-frequency and high-amplitude output. It is still difficult to achieve the effect of reducing the center rod emission response by 8 to 12 dB. The stress and structural impedance at the transition between the scalpel shafts vary greatly, and there is a defect of uneven energy and stress in the center rod. Summary of the Invention

[0004] The purpose of the present invention is to provide a short-range open ultrasonic surgical knife center rod in order to solve the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A short-range open ultrasonic scalpel center rod comprises a scalpel body, wherein the scalpel body is provided with a first center rod segment, a second center rod segment, a third center rod segment, a fourth center rod segment, a fifth center rod segment and a sixth center rod segment, wherein the sixth center rod segment is connected to the scalpel body, the first center rod segment is provided with a primary amplitude amplification structure, the second center rod segment is provided with an amplitude reduction control structure, the third center rod segment is provided with a slowing transition structure, the fourth center rod segment is provided with an amplitude expansion structure, the fifth center rod segment is provided with a conduction structure, and the sixth center rod segment is provided with a high-amplitude output structure.

[0007] In the above-mentioned short-range open ultrasonic surgical knife center rod, the first-stage amplitude amplification structure includes a first catenary body arranged on the first center rod segment.

[0008] In the above-mentioned short-range open ultrasonic surgical knife center rod, the first center rod segment includes a first rod body and a second rod body, one end of the first catenary body is connected to the first rod body, and the other end is connected to the second rod body, and the diameter of the first rod body is greater than the diameter of the second rod body.

[0009] In the above-mentioned short-range open ultrasonic surgical knife center rod, the amplitude reduction control structure includes a third rod body, a fourth rod body and a fifth rod body arranged on the second center rod segment, the diameter of the fourth rod body is greater than the diameter of the third rod body, the diameter of the fourth rod body is greater than the diameter of the fifth rod body, and the length of the third rod body is greater than the length of the fifth rod body.

[0010] In the above-mentioned short-range open ultrasonic surgical knife center rod, the slowing transition structure includes a Gaussian parabola structure arranged on the third center rod segment.

[0011] In the above-mentioned short-range open ultrasonic surgical knife center rod, the third center rod segment is further provided with a first cone and a second cone, and the first cone and the second cone are connected to form a dumbbell-shaped structure.

[0012] In the above-mentioned short-range open ultrasonic surgical knife center rod, the expansion structure includes a sixth rod body and a seventh rod body arranged on the fourth center rod segment, and the diameter of the sixth rod body is larger than the diameter of the rod body between the sixth rod body and the second cone body.

[0013] In the above-mentioned short-range open ultrasonic surgical knife center rod, the diameter of the fifth center rod segment is greater than the diameter of the seventh rod body.

[0014] In the above-mentioned short-range open ultrasonic surgical knife center rod, the high-amplitude output structure includes an eighth rod body, a ninth rod body, a second catenary body and a tenth rod body arranged on the sixth center rod segment.

[0015] In the above-mentioned short-range open ultrasonic surgical knife center rod, the diameter of the ninth rod body is greater than the diameter of the eighth rod body, and the diameter of the tenth rod body is smaller than the diameter of the ninth rod body.

[0016] Compared with the existing technology, the advantages of the present invention are:

[0017] 1. The present invention is applied to open surgery and adopts a short-range central rod. By setting a first-level amplitude amplification structure, an amplitude reduction control structure, a slowing transition structure, an amplitude expansion structure, a conduction structure, and a high-amplitude output structure, the central rod emission response is reduced by 8 to 12 dB, thereby greatly reducing the central static impedance and achieving instantaneous dehydration and coagulation of the tissue.

[0018] 2. The transition arcs between all the tool bar steps in the present invention adopt a catenary design, which can reduce the stress during the amplitude change process and reduce the structural impedance, and the energy and stress of the center bar are more uniform.

[0019] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a structural diagram of another aspect of the present invention.

[0022] Figure 3 It is the amplitude curve distribution diagram of the present invention.

[0023] In the figure: a scalpel body 1, a first central rod segment 2, a second central rod segment 3, a third central rod segment 4, a fourth central rod segment 5, a fifth central rod segment 6, a sixth central rod segment 7, a primary amplitude amplification structure 8, an amplitude reduction control structure 9, a slowdown transition structure 10, an amplitude expansion structure 11, a high-amplitude output structure 13, a first catenary body 14, a first rod body 15, a second rod body 16, a third rod body 17, a fourth rod body 18, a fifth rod body 19, a Gaussian parabola structure 20, a first cone body 21, a second cone body 22, a sixth rod body 23, a seventh rod body 24, an eighth rod body 25, a ninth rod body 26, a second catenary body 27, and a tenth rod body 28. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-3As shown, a short-range open ultrasonic scalpel center rod includes a scalpel body 1, on which a first center rod segment 2, a second center rod segment 3, a third center rod segment 4, a fourth center rod segment 5, a fifth center rod segment 6 and a sixth center rod segment 7 are provided. The sixth center rod segment 7 is connected to the scalpel body 1, the first center rod segment 2 is provided with a primary amplitude amplification structure 8, the second center rod segment 3 is provided with an amplitude reduction control structure 9, the third center rod segment 4 is provided with a slowing transition structure 10, the fourth center rod segment 5 is provided with an amplitude expansion structure 11, the fifth center rod segment 6 is provided with a conduction structure, and the sixth center rod segment 7 is provided with a high-amplitude output structure 13.

[0026] In this embodiment, the central rod model is determined according to the required operating frequency, amplitude output, size control, horizontal dimension emission response and other requirements, and a parabolic structure of various overall shapes (conical, exponential, catenary, Gaussian, etc.) is selected. Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0027] The first central rod section 2 is used to ensure that the energy is fully transmitted to the central rod by the transducer. For the first half wavelength of the connection, a large diameter change is made by setting a first-stage amplitude amplification structure 8. At the same time, the first-stage amplitude amplification structure 8 can also eliminate the stress problem, which not only fully transmits energy without overflow, but also amplifies the energy amplitude, and is also the first-stage amplitude amplification.

[0028] The second center rod section 3 is designed to ensure that the energy is fully transmitted to the center rod by the transducer and effectively control the amplification of the shear wave ratio. This section needs to be designed to reduce the amplitude. By setting the amplitude reduction control structure 9, this structure effectively slows down the amplification of the amplitude, while ensuring the generation of shear waves and avoiding energy overflow.

[0029] The third central rod section 4 is designed to ensure effective growth of the amplitude. At the same time, this section needs to slowly amplify the amplitude to avoid the generation of overflow shear waves. By setting a slowing transition structure 10, the amplitude can transition smoothly. This section also adopts a unique parabolic structure design at the node to achieve stress concentration control and avoid abnormal noise or tearing of the metal internal crystal structure caused by the central rod during operation.

[0030] The fourth center rod section 5 is designed to ensure effective growth of the amplitude. This section belongs to the middle and rear section of the center rod. In this section, a half-wavelength structure is designed. The amplitude of this section expands the gain amplification ratio, which plays a good role in the amplitude amplification ratio of the center rod. This section adopts an expansion structure 11. The front section directly inherits the energy of the previous section, and the half-wavelength rear end is designed with a stepped ratio amplification, so that the amplitude is effectively expanded and the minimum energy spillover is guaranteed.

[0031] The fifth central rod section 6 is to ensure the integrity of the overall amplitude transmission. This section of the structure plays a role of connecting the previous and the next. The conductive structure can make the energy transition smoothly.

[0032] In order to ensure the stable output of energy, the sixth central rod section 7 adopts a high-amplitude output structure 13 at the end of the central rod, so that the central rod can obtain high-amplitude energy output, stable output of high longitudinal wave and low shear wave, thereby achieving the cutting and coagulation effect on soft tissue.

[0033] The transition arcs between all tool bar steps adopt catenary design, which can reduce the stress and structural impedance during the amplitude change process.

[0034] This structure is used in open surgery and adopts a short-range central rod, which achieves the effect of reducing the central rod emission response by 8 to 12dB, thereby greatly reducing the central static impedance and achieving instantaneous dehydration and coagulation of tissue.

[0035] Combine Figure 1 、 Figure 3 As shown, the primary amplitude amplification structure 8 includes a first catenary body 14 arranged on the first central rod segment 2, and the first central rod segment 2 includes a first rod body 15 and a second rod body 16. One end of the first catenary body 14 is connected to the first rod body 15, and the other end is connected to the second rod body 16. The diameter of the first rod body 15 is larger than the diameter of the second rod body 16.

[0036] In this embodiment, according to Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0037] When X=1, the first central rod segment 2 undergoes a larger diameter change for the first half wavelength of the connection to ensure that the energy is fully transmitted to the central rod by the transducer. That is, the diameter of the first rod body 15 is larger than the diameter of the second rod body 16, forming a step. In order to eliminate stress problems, the structural change design of the first catenary body 14 is selected, which not only fully transmits energy without overflow, but also amplifies the energy amplitude, which is also the first level of amplitude amplification.

[0038] The damping control structure 9 includes a third rod 17, a fourth rod 18 and a fifth rod 19 arranged on the second central rod segment 3. The diameter of the fourth rod 18 is larger than the diameter of the third rod 17, the diameter of the fourth rod 18 is larger than the diameter of the fifth rod 19, and the length of the third rod 17 is larger than the length of the fifth rod 19.

[0039] In this embodiment, according to Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0040] When X=2, in order to ensure that the energy is fully transmitted to the center rod by the transducer and effectively control the amplification of the shear wave ratio, the second center rod section 3 needs to be designed to reduce the amplitude. The diameter of the fourth rod 18 is greater than the diameter of the third rod 17, and the diameter of the fourth rod 18 is greater than the diameter of the fifth rod 19. The length of the third rod 17 is greater than the length of the fifth rod 19, so that a step is formed between the third rod 17 and the fourth rod 18, and a step is formed between the fourth rod 18 and the fifth rod 19. The length of the former step is greater than the length of the latter step, and an asymmetric push-pull structure is formed between the two steps. The half-wavelength tail adopts a unique parabolic design. This structure effectively slows down the amplification of the amplitude, while ensuring the generation of shear waves and avoiding energy spillover.

[0041] Combine Figure 2-3 As shown, the slowing transition structure 10 includes a Gaussian parabola structure 20 arranged on the third center rod segment 4. The third center rod segment 4 is also provided with a first cone 21 and a second cone 22. The first cone 21 and the second cone 22 are connected to form a dumbbell-shaped structure.

[0042] In this embodiment, according to Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0043] When X=3, in order to ensure the effective growth of the amplitude, the third center rod section 4 needs to slowly amplify the amplitude at the same time to avoid the generation of overflow shear waves. The structure of this section is combined with the double-step amplitude slowdown design of the half-wavelength front section, that is, the amplitude reduction control structure 9. The half-wavelength rear end adopts the first cone 21 and the second cone 22 to form a dumbbell-shaped structure and a step-type composite design, so that the amplitude transitions smoothly. This section also adopts the unique parabolic structure design of the Gaussian parabola structure 20 at the node to achieve stress concentration control and avoid abnormal noise or tearing of the internal crystal structure of the metal caused by the center rod when working.

[0044] The expansion structure 11 includes a sixth rod body 23 and a seventh rod body 24 arranged on the fourth central rod segment 5. The diameter of the sixth rod body 23 is larger than the diameter of the rod body between the sixth rod body 23 and the second conical body 22. The diameter of the fifth central rod segment 6 is larger than the diameter of the seventh rod body 24.

[0045] In this embodiment, according to Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0046] When X=4, the fourth center rod segment 5 is designed to ensure effective growth of the amplitude. This segment belongs to the middle and rear sections of the center rod. In this segment, a half-wavelength structure is used. The amplitude of this segment expands the gain amplification ratio and plays a good role in the amplitude amplification ratio of the center rod. The diameter of the sixth rod body 23 is larger than the diameter of the rod body between the sixth rod body 23 and the second cone-shaped body 22. The diameter of the fifth center rod segment 6 is larger than the diameter of the seventh rod body 24. This segment adopts a separate step design. The front section directly inherits the energy of the previous section, and the half-wavelength rear end is designed with a step-by-step ratio amplification, so that the amplitude is effectively expanded to ensure minimal energy spillover.

[0047] When X=5, the fifth central rod segment 6 ensures the integrity of the overall amplitude transmission. This segment of the structure plays a role of connecting the previous and the next. The conductive structure is a complete rod body with a uniform diameter, which can ensure a smooth transition of energy.

[0048] Combine Figure 1-3 As shown, the high-amplitude output structure 13 includes an eighth rod 25, a ninth rod 26, a second catenary 27 and a tenth rod 28 arranged on the sixth central rod segment 7. The diameter of the ninth rod 26 is larger than that of the eighth rod 25, and the diameter of the tenth rod 28 is smaller than that of the ninth rod 26.

[0049] In this embodiment, according to Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0050] When X=6, in order to ensure stable energy output, the sixth central rod segment 7 has a ninth rod body 26 at the end of the central rod with a diameter greater than that of the eighth rod body 25, and a tenth rod body 28 with a diameter smaller than that of the ninth rod body 26, forming a stepped structure. The structure adopts a half-wavelength stepped design and a large-scale amplified catenary design. The stepped design cooperates with the second catenary body 27 to enable the central rod to obtain high-amplitude energy output and stable output of high longitudinal waves and low shear waves, thereby achieving the cutting and coagulation effect on soft tissue.

[0051] The working principle of the present invention is:

[0052] according to Where x represents the horizontal coordinate of the model, y represents the vertical coordinate of the model, and A represents the model parameter, which determines the vertical and horizontal proportional relationship of the model. The central rod is composed of multiple (X half wavelength, X>0 and X is an integer) amplitude amplification or reduction structures. The various structures meet the final overall structural design requirements and are the result of the fusion of multiple structural forms.

[0053] When X=1, the first central rod segment 2 is subjected to a large diameter change for the first half wavelength of the connection to ensure that the energy is fully transmitted to the central rod by the transducer. That is, the diameter of the first rod body 15 is larger than the diameter of the second rod body 16, forming a step. In order to eliminate the stress problem, the structural change design of the first catenary body 14 is selected. This not only fully transmits energy without overflow, but also amplifies the energy amplitude, which is also the first level of amplitude amplification.

[0054] When X=2, in order to ensure that the energy is fully transmitted to the center rod by the transducer and effectively control the amplification of the shear wave ratio, the second center rod section 3 needs to be designed to reduce the amplitude. The diameter of the fourth rod 18 is greater than the diameter of the third rod 17, and the diameter of the fourth rod 18 is greater than the diameter of the fifth rod 19. The length of the third rod 17 is greater than the length of the fifth rod 19, so that a step is formed between the third rod 17 and the fourth rod 18, and a step is formed between the fourth rod 18 and the fifth rod 19. The length of the former step is greater than the length of the latter step, and an asymmetric push-pull structure is formed between the two steps. The half-wavelength tail adopts a unique parabolic design. This structure effectively slows down the amplification of the amplitude, while ensuring the generation of shear waves and avoiding energy spillover.

[0055] When X=3, in order to ensure the effective growth of the amplitude, the third central rod section 4 needs to slowly amplify the amplitude at the same time to avoid the generation of overflow shear waves. The structure of this section is combined with the double-step amplitude slowdown design of the half-wavelength front section, namely the amplitude reduction control structure 9. The half-wavelength rear end adopts the first cone 21 and the second cone 22 to form a dumbbell-shaped structure and a stepped composite design, so that the amplitude transition is smooth. This section also adopts the unique parabolic structure design of the Gaussian parabola structure 20 at the node to achieve stress concentration control and avoid abnormal noise or tearing of the internal crystal structure of the metal caused by the central rod when working.

[0056] When X=4, the fourth center rod segment 5 is designed to ensure effective amplitude growth. This segment belongs to the middle and rear sections of the center rod. In this segment, a half-wavelength structure is used. The amplitude of this segment expands the gain amplification ratio, which plays a good role in the amplitude amplification ratio of the center rod. The diameter of the sixth rod body 23 is larger than the diameter of the rod body between the sixth rod body 23 and the second cone 22. The diameter of the fifth center rod segment 6 is larger than the diameter of the seventh rod body 24. This segment adopts a separate step design. The front section directly inherits the energy of the previous section, and the half-wavelength rear end is designed with a step-by-step ratio amplification, so that the amplitude is effectively expanded and the minimum energy spillover is guaranteed.

[0057] When X=5, the fifth central rod segment 6 ensures the integrity of the overall amplitude transmission. This segment plays a role of connecting the previous and the next. The conductive structure is a complete rod with a uniform diameter, which can make the energy transfer smooth.

[0058] When X=6, in order to ensure the stable output of energy, the diameter of the ninth rod body 26 at the end of the center rod is larger than that of the eighth rod body 25, and the diameter of the tenth rod body 28 is smaller than that of the ninth rod body 26, forming a stepped structure. The half-wavelength stepped design and the large-scale amplified catenary design are adopted. The stepped design cooperates with the second catenary body 27 to enable the center rod to obtain high-amplitude energy output, stable output of high longitudinal waves and low shear waves, thereby achieving the cutting and coagulation effect on soft tissue. Among them, X=1, X=2, X=3, X=4, X=5, and X=6 are all Figure 3 The amplitude curve distribution diagram in the figure corresponds to the X=1, X=2, X=3, X=4, X=5, and X=6 segments.

[0059] This structure is used in open surgery, using a short-range central rod to achieve an 8-12dB reduction in the central rod's emission response, thereby significantly reducing the central static impedance and achieving instant dehydration and coagulation of the tissue.

[0060] The transition arcs between all tool bar steps adopt catenary design, which can reduce the stress and structural impedance during the amplitude change process.

[0061] The energy and stress distribution of the finished product center rod are nearly uniform, thereby improving the uniformity of the proportional transmission of longitudinal and shear waves, achieving stable cutting and hemostasis.

[0062] The center rod can be flexibly adjusted according to the two designed windows to meet the differences between different batches of the same material, thereby enhancing production efficiency.

[0063] The integrated algorithm design of the center rod amplitude, frequency and stress has been realized, which greatly reduces the problem of external interference in actual application, greatly reduces the processing defective rate, and improves the production yield.

[0064] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods without departing from the spirit of the present invention.

[0065] Although the present invention generally uses the terms such as the scalpel body 1, the first central rod segment 2, the second central rod segment 3, the third central rod segment 4, the fourth central rod segment 5, the fifth central rod segment 6, the sixth central rod segment 7, the first amplitude amplification structure 8, the amplitude reduction control structure 9, the slowing transition structure 10, the amplitude expansion structure 11, the high amplitude output structure 13, the first catenary 14, the first rod 15, the second rod 16, the third rod 17, the fourth rod 18, the fifth rod 19, the Gaussian parabola structure 20, the first conical 21, the second conical 22, the sixth rod 23, the seventh rod 24, the eighth rod 25, the ninth rod 26, the second catenary 27, and the tenth rod 28, the possibility of using other terms is not excluded. The use of these terms is merely to more conveniently describe and explain the essence of the present invention, and interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A short-range open ultrasonic surgical knife center rod, comprising a surgical knife body (1), characterized in that: The scalpel body (1) is provided with a first central rod segment (2), a second central rod segment (3), a third central rod segment (4), a fourth central rod segment (5), a fifth central rod segment (6) and a sixth central rod segment (7); the sixth central rod segment (7) is connected to the scalpel body (1); the first central rod segment (2) is provided with a first-stage amplitude amplification structure (8); the second central rod segment (3) is provided with an amplitude reduction control structure (9); the third central rod segment (4) is provided with a slowing transition structure (10); the fourth central rod segment (5) is provided with an amplitude expansion structure (11); the fifth central rod segment (6) is provided with a conduction structure; and the sixth central rod segment (7) is provided with a high-amplitude output structure (13); The first-stage amplitude amplification structure (8) comprises a first catenary-shaped body (14) arranged on the first central rod segment (2); The first central rod section (2) comprises a first rod body (15) and a second rod body (16); one end of the first catenary body (14) is connected to the first rod body (15), and the other end is connected to the second rod body (16); the diameter of the first rod body (15) is larger than the diameter of the second rod body (16).

2. The short-range open ultrasonic surgical knife center rod according to claim 1, characterized in that: The damping control structure (9) comprises a third rod (17), a fourth rod (18) and a fifth rod (19) arranged on the second central rod section (3); the diameter of the fourth rod (18) is greater than the diameter of the third rod (17); the diameter of the fourth rod (18) is greater than the diameter of the fifth rod (19); and the length of the third rod (17) is greater than the length of the fifth rod (19).

3. The short-range open ultrasonic surgical knife center rod according to claim 2, characterized in that: The slowing transition structure (10) comprises a Gaussian parabola structure (20) arranged on the third central rod segment (4).

4. The short-range open ultrasonic surgical knife center rod according to claim 3, characterized in that: The third central rod segment (4) is further provided with a first cone (21) and a second cone (22), and the first cone (21) and the second cone (22) are connected to form a dumbbell-shaped structure.

5. The short-range open ultrasonic surgical knife center rod according to claim 4, characterized in that: The expansion structure (11) comprises a sixth rod (23) and a seventh rod (24) arranged on the fourth central rod segment (5); the diameter of the sixth rod (23) is larger than the diameter of the rod between the sixth rod (23) and the second conical body (22).

6. The short-range open ultrasonic surgical knife center rod according to claim 5, characterized in that: The diameter of the fifth central rod section (6) is greater than the diameter of the seventh rod body (24).

7. The short-range open ultrasonic surgical knife center rod according to claim 6, characterized in that: The high-amplitude output structure (13) comprises an eighth rod body (25), a ninth rod body (26), a second catenary body (27) and a tenth rod body (28) arranged on the sixth central rod segment (7).

8. The short-range open ultrasonic surgical knife center rod according to claim 7, characterized in that: The diameter of the ninth rod (26) is greater than the diameter of the eighth rod (25), and the diameter of the tenth rod (28) is smaller than the diameter of the ninth rod (26).

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