High-frequency electrotome switch assembly and high-frequency electrotome

Abstract

The switch assembly comprises a contact switch, a control circuit board, a first spring, a second spring and a protective cover, the contact switch is fixed on the control circuit board and electrically connected with the control circuit board, and the protective cover covers the periphery of the contact switch and is in sliding connection with the control circuit board. The protection cover slides in the direction close to or away from the control circuit board, the first spring and the second spring are arranged between the contact switch and the protection cover, the first spring is sleeved with the second spring, one end of the first spring abuts against a contact of the contact switch, and the other end of the first spring abuts against the inner wall of the protection cover; one end of the second spring abuts against the fixed frame outside the contact of the contact switch, and the other end of the second spring abuts against the inner wall of the protective cover. The protection cover slides in the direction close to the control circuit board to compress the first spring and the second spring, in the initial state, the first spring is compressed by a first preset amount to keep first pre-pressure, and the second spring is compressed by a second preset amount to keep second pre-pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, and more specifically, to a high-frequency electric knife switch component and a high-frequency electric knife. Background Art

[0002] With the continuous innovation and development of medical technology, minimally invasive surgery technology has become increasingly mature and has gradually become a new trend in surgical operations. High-frequency electrosurgical unit is a device that uses high-frequency arc tunnels to blast and coagulate tissue cells to achieve cutting and hemostasis effects. Compared with traditional mechanical scalpels, it has fast cutting speed, good hemostasis effect, wide range of surgical applications, simple operation, safety and convenience, and can meet the basic requirements of surgical operations such as cutting, hemostasis, and injury reduction. The use of high-frequency electrosurgical units in clinical practice can greatly shorten the operation time, reduce the amount of blood loss and blood transfusion of patients, reduce the incidence of complications, and save surgical costs. Due to the reasonable hemostasis principle and excellent hemostasis effect of high-frequency electrosurgical units, it has become the preferred device for surgeons to stop bleeding during surgery. However, although the switch assembly of the current high-frequency electric knife is equipped with a stabilizing spring to prevent shaking, the excitation force and the prompt sound are completely determined by the standard contact switch, which is not conducive to free adjustment in design; moreover, there is a risk of disconnecting the switch if some pressure on the handle is accidentally released; in addition, the excitation force of the contact switch is about 20N, and a "mutation" of force occurs at the moment of excitation. Therefore, the handle will feel a "clicking" when the switch is excited, affecting the stability of operation. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model innovatively provides a high-frequency electric knife switch assembly and a high-frequency electric knife, which have an anti-shake function. Even when the trigger returns slightly, for example, when the trigger moves a slight distance away from the handle, the biasing force of the first spring will maintain the contact switch in an activated state. Therefore, accidental release of some pressure on the handle will not disconnect the switch, thereby improving operational stability; it has smoother switch excitation and better operating experience; the force gradually increases during the spring compression process, effectively reducing the "mutation" force at the moment of contact switch excitation; the second spring bears part of the pressing force, and a contact switch with a small excitation force can be selected. The arrangement of the contact switch excitation force and the second spring force allows the designer to freely adjust the tactile feel during the switch excitation process.

[0004] In order to achieve the above technical objectives, the utility model discloses a high-frequency electric knife switch assembly in the first aspect, including a contact switch, a control circuit board, a first spring, a second spring and a protective cover.

[0005] The contact switch is fixed on the control circuit board and electrically connected to the control circuit board. The protective cover is arranged on the periphery of the contact switch and is slidably connected to the control circuit board. The protective cover slides in a direction close to or away from the control circuit board.

[0006] The first spring and the second spring are arranged inside the protective cover and are located between the contact switch and the protective cover, the second spring is sleeved outside the first spring, one end of the first spring is against the contact of the contact switch, and the other end of the first spring is against the inner wall of the protective cover; one end of the second spring is against the fixed frame outside the contact of the contact switch, and the other end of the second spring is against the inner wall of the protective cover; the protective cover slides toward the direction close to the control circuit board to compress the first spring and the second spring, and in the initial state, the first spring is compressed by a first preset amount to maintain a first preload, and the second spring is compressed by a second preset amount to maintain a second preload.

[0007] Furthermore, the protective cover comprises a protective cover body and a plurality of claws connected to an open end of the protective cover body, and the plurality of claws hold the control circuit board and slide in a direction perpendicular to the control circuit board.

[0008] Furthermore, the claw comprises a claw support and a claw rod perpendicular to the control circuit board, and the claw support is fixed to an end of the claw rod away from the protective cover body.

[0009] Furthermore, the protective cover body includes a cover body, an inner sleeve column and an outer sleeve column, the inner sleeve column and the outer sleeve column are fixed on the inner end surface of the closed end of the cover body, the outer sleeve column is annular and is sleeved on the outside of the inner sleeve column, the first spring is sleeved on the inner sleeve column and is located in the gap between the inner sleeve column and the outer sleeve column, and the second spring is sleeved on the outer sleeve column.

[0010] Furthermore, the inner wall of the outer sleeve is in a step shape, and the end of the first spring abuts against the step surface of the outer sleeve.

[0011] Furthermore, the contact switch is welded to the control circuit board.

[0012] Furthermore, the excitation force of the contact switch is 5 to 30 N, and the stroke is 0.5 to 2 mm.

[0013] Furthermore, the stiffness coefficient of the first spring is 0.5-2N / mm, and the first preload is 0.05N-2N.

[0014] Furthermore, the stiffness coefficient of the second spring is 0.5-2N / mm, and the second preload is 1N-10N.

[0015] In order to achieve the above technical purpose, the second aspect of the utility model discloses a high-frequency electric knife, including the high-frequency electric knife switch assembly described in the first aspect.

[0016] The beneficial effects of the utility model are:

[0017] The high-frequency electric knife switch assembly of the utility model has an anti-shake function. Even when the trigger returns slightly, for example, when the trigger moves a slight distance in the direction away from the handle, the biasing force of the first spring will maintain the contact switch in an activated state. Therefore, accidental release of some pressure on the handle will not disconnect the switch, thereby improving operational stability; it has smoother switch excitation and better operating experience; the force gradually increases during the spring compression process, effectively reducing the "mutation" force at the moment of contact switch excitation; the second spring bears part of the pressing force, and a contact switch with a small excitation force can be selected. The arrangement of the contact switch excitation force and the second spring force allows the designer to freely adjust the tactile feel during the switch excitation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a high-frequency electric knife switch assembly according to an embodiment of the utility model.

[0019] Figure 2 yes Figure 1 AA section view.

[0020] Figure 3 It is a cross-sectional view of a high-frequency electric knife according to an embodiment of the utility model.

[0021] Figure 4 It is a comparison diagram of the switch reaction force of the switch assembly of the embodiment of the utility model and the existing switch assembly which is only provided with one spring.

[0022] Figure 5 The figure is a comparison diagram of the trigger holding force of the switch assembly of the embodiment of the utility model and the existing switch assembly which is only provided with one spring.

[0023] In the figure,

[0024] 1. Contact switch; 11. Contact; 12. Fixed frame; 2. Control circuit board; 3. First spring; 4. Second spring; 5. Protective cover; 51. Protective cover body; 511. Cover body; 512. Inner sleeve column; 513. Outer sleeve column; 52. Claw; 521. Claw support; 522. Claw rod; 6. Handle; 7. Host; 8. Trigger. DETAILED DESCRIPTION

[0025] The high-frequency electric knife switch assembly and the high-frequency electric knife provided by the utility model are explained and illustrated in detail below in conjunction with the drawings in the specification.

[0026] This embodiment specifically discloses a high-frequency electric knife switch assembly, such as Figure 1 and 2 As shown, it includes a contact switch 1, a control circuit board 2, a first spring 3, a second spring 4 and a protective cover 5. The contact switch 1 has a suitable trigger force, return force and stroke, and provides obvious tactile feedback and prompt sound during the triggering process. The contact switch 1 is fixed on the control circuit board 2 and is electrically connected to the control circuit board 2. In this embodiment, the control circuit board 2 is a PCB board. Preferably, the contact switch 1 is welded to the control circuit board 2. The welding method can realize both mechanical connection and electrical connection between the contact switch 1 and the control circuit board 2, and the welding process is simple. The welding is stable and reliable. The protective cover 5 is arranged on the periphery of the contact switch 1 and is slidably connected to the control circuit board 2. The protective cover 5 slides in a direction close to or away from the control circuit board 2. The protective cover 5 covers the contact switch 1 inside to protect the contact switch 1.

[0027] The first spring 3 and the second spring 4 are arranged inside the protective cover 5 and between the contact switch 1 and the protective cover 5. The second spring 4 is sleeved outside the first spring 3. Preferably, the first spring 3 and the second spring 4 are sleeved coaxially and arranged coaxially with the protective cover 5. One end of the first spring 3 is against the contact 11 of the contact switch 1, and the other end of the first spring 3 is against the inner wall of the protective cover 5 facing the contact 11; one end of the second spring 4 is against the fixed frame 12 outside the contact of the contact switch 1, and the other end of the second spring 4 is against the inner wall of the protective cover 5 facing the contact 11. The second spring 4 increases the triggering force of the switch assembly and adjusts the tactile feeling when the doctor activates the switch assembly; at the same time, the second spring 4 provides a reaction force, which effectively reduces the "mutation" force at the moment of activation of the contact switch 1, providing smoother switch activation and better operation experience. The protective cover 5 slides in the direction close to the control circuit board 2 to compress the first spring 3 and the second spring 4. By pressing the protective cover 5 to move it in the direction of the control circuit board 2, the force of the first spring 3 acts on the contact 11 of the contact switch 1 to activate the contact switch 1, and the second spring 4 adjusts the touch. The protective cover 5 slides in the direction away from the control circuit board 2 to release the first spring 3 and the second spring 4. In the initial state (the protective cover 5 is not pressed), the first spring 3 is compressed by the first preset amount to maintain the first preload, and the second spring 4 is compressed by the second preset amount to maintain the second preload, that is, when the switch assembly does not apply external force, the first spring 3 and the second spring 4 are also in a compressed state, but are not completely compressed, and maintain a certain preload, but the preload is not enough to activate the switch. When in use, the trigger 8 is pressed to press the protective cover 5 to activate the contact switch 1. Even if the trigger 8 moves a slight distance away from the handle 6 (i.e., the first spring 3 and the second spring 4 rebound a slight distance), the biasing force of the first spring 3 (the sum of the first pre-pressure and the external force) will maintain the contact switch 1 in an activated state. Therefore, accidental release of some pressure on the handle 6 will not disconnect the switch, thereby preventing the switch assembly from being broken due to shaking during the doctor's operation, thereby improving the operational stability.

[0028] The present application is provided with two springs, which provide a greater reaction force when the protective cover 5 is pressed. The force gradually increases during the spring compression process, effectively reducing the "mutation" force of the contact switch 1 at the moment of excitation; it has smoother switch excitation and better operating experience. The switch assembly of the present application is provided with a spring, which also has the function of anti-shake; moreover, the second spring 4 is set to bear part of the pressing force, and a contact switch 1 with a small excitation force can be selected. The arrangement of the contact switch excitation force and the second spring 4 force allows the designer to freely adjust the tactile feel during the switch excitation process. You can flexibly select the excitation force for activating the contact switch and the stiffness coefficient of the second spring 4, and then freely adjust the tactile feel during the switch excitation process.

[0029] Optionally, the excitation force of the contact switch 1 is 5 to 30 N, more preferably 8 to 12 N, most preferably 10 N; the stroke is 0.5 to 2 mm, more preferably 0.9 mm.

[0030] Optionally, the stiffness coefficient of the first spring 3 is 0.5-2N / mm, more preferably 0.8N / mm; the first preload is 0.05N-2N, more preferably 0.2N.

[0031] Optionally, the stiffness coefficient of the second spring 4 is 0.5-2N / mm, more preferably 0.96N / mm; the second preload is 1N-10N, more preferably 3.8N.

[0032] In this embodiment, a contact switch 1 with an excitation force of about 10N can be selected, and another force of about 10N can be distributed to the second spring 4. A contact switch 1 with other excitation forces and a second spring 4 with other stiffness coefficients can also be selected to freely adjust the tactile feeling during the switch excitation process.

[0033] like Figure 1 and 2 As shown, the protective cover 5 includes a protective cover body 51 and a plurality of claws 52 connected to the open end of the protective cover body 51. The plurality of claws 52 hold the control circuit board 2 and slide in a direction perpendicular to the control circuit board 2 to achieve smooth sliding and compress the first spring 3 and the second spring 4. Preferably, the number of claws 52 is 4 and they are distributed in a rectangular shape. Two groups of claws 52 are located on the same side of the control circuit board 2, and the two groups are distributed on different sides of the control circuit board 2 to hold the control circuit board 2. Specifically, the claws 52 include a claw support 521 and a claw rod 522 perpendicular to the control circuit board 2. The claw support 521 is fixed to one end of the claw rod 522 away from the protective cover body 51. Preferably, the claw support 521 is flat and perpendicular to the claw rod 522. The claw support 521 holds the control circuit board 2, and the claw rods 522 on both sides of the control circuit board 2 form a guide mechanism to apply external force to the protective cover body 51. The claw rods 522 slide in a direction perpendicular to the control circuit board 2 to ensure accurate pressing of the contacts of the contact switch 1, thereby stimulating the contact switch 1.

[0034] Alternatively, if Figure 2 As shown, the protective cover body 51 includes a cover body 511, an inner sleeve column 512 and an outer sleeve column 513, the inner sleeve column 512 and the outer sleeve column 513 are fixed on the inner end surface of the closed end of the cover body 511, the outer sleeve column 513 is annular and sleeved outside the inner sleeve column 512, the first spring 3 is sleeved on the inner sleeve column 512 in the gap between the inner sleeve column 512 and the outer sleeve column 513, and the second spring 4 is sleeved on the outer sleeve column 513. The inner sleeve column 512 fixes the first spring 3 and plays a guiding role, the outer sleeve column 513 fixes the second spring 4 and plays a guiding role, and the gap between the inner sleeve column 512 and the outer sleeve column 513 plays a limiting role. Preferably, the inner wall of the outer sleeve column 513 is stepped, and a gap is formed between the larger diameter portion and the outer wall of the inner sleeve column 512, and the smaller diameter portion can be in close contact with the inner sleeve column 512. The outer sleeve column and the inner sleeve column can be formed as one piece, and the end of the first spring 3 rests on the step surface of the outer sleeve column 513 to facilitate the installation of the first spring 3.

[0035] Optionally, the two ends of the first spring 3 can be fixedly connected to the contact 11 of the contact switch 1 and the cover 511 respectively, and the two ends of the second spring 4 can be fixedly connected to the fixed frame 12 of the contact switch 1 and the cover 511 respectively to ensure the stability of the connection.

[0036] The present application also discloses a high-frequency electric knife, such as Figure 3 As shown, it includes the high-frequency electric knife switch assembly described in the above embodiment, the switch assembly is arranged on the handle 6, the control circuit board 2 is arranged inside the handle 6 and connected to the host 7, the protective cover 5 is embedded in the handle 6 and can slide relative to the handle 6, the end of the protective cover 5 away from the control circuit board 2 protrudes outside the handle 6, that is, part of the protective cover body 51 protrudes outside the handle 6, after the doctor holds the handle 6, he presses the trigger 8, and the trigger 8 close to the side of the protective cover 5 contacts and presses the outer wall of the protective cover 5, thereby pressing the first spring 3 and the second spring 4, and activating the contact switch 1.

[0037] The mechanical analysis of the trigger 8 during operation is as follows: Figure 4 and 5 As shown, the switch assembly of the present application has smoother switch activation, better operating experience, and better tactile feel.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and simple improvement made to the essential content of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-frequency electric knife switch assembly, characterized in that: The invention comprises a contact switch (1), a control circuit board (2), a first spring (3), a second spring (4) and a protective cover (5). The contact switch (1) is fixed on the control circuit board (2) and is electrically connected to the control circuit board (2); the protective cover (5) is arranged on the periphery of the contact switch (1) and is slidably connected to the control circuit board (2); the protective cover (5) slides in a direction approaching or moving away from the control circuit board (2); The first spring (3) and the second spring (4) are arranged inside the protective cover (5) and between the contact switch (1) and the protective cover (5); the second spring (4) is sleeved outside the first spring (3); one end of the first spring (3) abuts against the contact (11) of the contact switch (1), and the other end of the first spring (3) abuts against the inner wall of the protective cover (5); one end of the second spring (4) abuts against the fixed frame (12) outside the contact of the contact switch (1), and the other end of the second spring (4) abuts against the inner wall of the protective cover (5); the protective cover (5) slides in a direction approaching the control circuit board (2) to compress the first spring (3) and the second spring (4); in an initial state, the first spring (3) is compressed by a first preset amount to maintain a first preload, and the second spring (4) is compressed by a second preset amount to maintain a second preload.

2. The high-frequency electric knife switch assembly according to claim 1, characterized in that: The protective cover (5) comprises a protective cover body (51) and a plurality of claws (52) connected to the open end of the protective cover body (51); the plurality of claws (52) hold the control circuit board (2) and slide in a direction perpendicular to the control circuit board (2).

3. The high-frequency electric knife switch assembly according to claim 2, characterized in that: The claw (52) comprises a claw support (521) and a claw rod (522) perpendicular to the control circuit board (2); the claw support (521) is fixed to an end of the claw rod (522) away from the protective cover body (51).

4. The high-frequency electric knife switch assembly according to claim 2 or 3, characterized in that: The protective cover body (51) comprises a cover body (511), an inner sleeve column (512) and an outer sleeve column (513); the inner sleeve column (512) and the outer sleeve column (513) are fixed on the inner end surface of the closed end of the cover body (511); the outer sleeve column (513) is annular and is sleeved outside the inner sleeve column (512); the first spring (3) is sleeved on the inner sleeve column (512) and is located in the gap between the inner sleeve column (512) and the outer sleeve column (513); and the second spring (4) is sleeved on the outer sleeve column (513).

5. The high-frequency electric knife switch assembly according to claim 4, characterized in that: The inner wall of the outer sleeve column (513) is in a step shape, and the end of the first spring (3) abuts against the step surface of the outer sleeve column (513).

6. The high-frequency electric knife switch assembly according to claim 1, characterized in that: The contact switch (1) is welded to the control circuit board (2).

7. The high-frequency electric knife switch assembly according to claim 1, characterized in that: The excitation force of the contact switch (1) is 5 to 30 N, and the stroke is 0.5 to 2 mm.

8. The high-frequency electric knife switch assembly according to claim 1 or 7, characterized in that: The stiffness coefficient of the first spring (3) is 0.5-2N / mm, and the first preload is 0.05N-2N.

9. The high-frequency electric knife switch assembly according to claim 8, characterized in that: The stiffness coefficient of the second spring (4) is 0.5-2N / mm, and the second preload is 1N-10N.

10. A high-frequency electric knife, characterized in that: A high-frequency electric knife switch assembly comprising any one of claims 1-9.

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