A pull rod drive structure and a bipolar insulated surgical forceps mechanism containing the same

Abstract

The present invention relates to the field of medical device technology, and in particular to a pull rod drive structure, including a fixed handle and a movable handle, a pull rod is slidably provided on the fixed handle, a slider is provided on the fixed handle and slides along the axial direction of the pull rod, a connecting rod assembly is provided between the slider and the movable handle, and the slider is connected to a swinging piece for pulling or releasing the pull rod, and the rotation center axis of the swinging piece is perpendicular to the axial direction of the pull rod. The pull rod drive structure of the present invention ensures the linear motion of the pull rod and reduces the wear of the pull rod.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a pull rod driving structure and a bipolar insulating surgical forceps mechanism containing the same. Background Art

[0002] The pull rod drive structure in the prior art generally does not have a guiding function. For example, the patent application number 201320297853.7 discloses a clamp for endoscopic surgery, which drives and adjusts the range of motion of the pull rod by adjusting the screw. Without the restriction of the drive structure, the pull rod is prone to deflection or wear, affecting its service life. Summary of the Invention

[0003] In order to solve the problem of easy wear of the pull rod in the prior art, the present invention provides a pull rod driving structure with a guiding function and a bipolar insulating clamp head assembly.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A pull rod drive structure includes a fixed handle and a movable handle, a pull rod is slidably provided on the fixed handle, a slider is provided on the fixed handle and slides along the axial direction of the pull rod, a connecting rod assembly is provided between the slider and the movable handle, the slider is connected to a swinging piece for pulling or releasing the pull rod, and the rotation center axis of the swinging piece is perpendicular to the axial direction of the pull rod.

[0006] Furthermore, the swinging member has a slot. When the slider moves away from the pull rod, the swinging member swings so that the slot clamps the convex portion at the end of the pull rod. A reset spring is connected between the slider and the fixed handle, and after the slider is reset, the convex portion disengages from the slot.

[0007] Furthermore, the swinging member is rotatably connected to the slider, and a driving mechanism for driving the swinging member to swing during the sliding of the slider is also provided in the fixed handle.

[0008] Furthermore, the driving mechanism includes a guide block fixedly connected to the fixed handle, the guide block is provided with a wedge surface for causing the swinging member to swing toward the pull rod, and a spring is provided between the swinging member and the slider to reset the swinging member.

[0009] Furthermore, the connecting rod assembly includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the fixed handle, the other end of the first connecting rod is hinged to the movable handle, one end of the second connecting rod is hinged to the first connecting rod, and the second end of the second connecting rod is hinged to the slider, and the first connecting rod is in contact with the slider and transmits power to each other.

[0010] Furthermore, the sliding block is provided with a plurality of guide posts, and the fixed handle is provided with guide grooves matching the guide posts.

[0011] Furthermore, a support seat is fixed on the slider for supporting the pull rod in the direction of the swinging member.

[0012] A bipolar insulated surgical forceps mechanism includes the above-mentioned pull rod drive structure, and also includes a bipolar insulated forceps head and a pipe fitting connected to a fixed handle, the pull rod is movably arranged in the pipe fitting, the bipolar insulated forceps head includes a first forceps head and a second forceps head, an insulating assembly is provided between the first forceps head and the second forceps head, the insulating assembly includes a first insulating part and a second insulating part that are fixedly connected, the first insulating part is provided with a through hole for rotatably connecting to the second forceps head, the first insulating part and the second insulating part cooperate to wrap the first forceps head part, the first insulating part is provided with a first accommodating groove for accommodating the second insulating part, and the second insulating part faces the first insulating part. The end face is provided with a second accommodating groove for inserting the first pliers head, the shape of the second accommodating groove matches the first pliers head, the depth of the first accommodating groove is set along the axial direction of the through hole, the second insulating part and the first pliers head both conflict with the bottom of the first accommodating groove of the first insulating part, the first pliers head has a first leg and a second leg, the second leg and the first leg are respectively located on both sides of the through hole, the pull rod is hinged to the first pliers head, the first end of the pipe fitting is equipped with a pliers seat, the second pliers head is hinged to the pliers seat, the second end of the pipe fitting is provided with a first insulating sleeve for guiding the pull rod, and the pliers seat is provided with a second insulating sleeve for limiting the pull rod.

[0013] Furthermore, the inner diameter of the second insulating sleeve is larger than the inner diameter of the pull rod, and the inner diameter of the second insulating sleeve is smaller than the inner diameter of the clamp seat.

[0014] Furthermore, the first and second pliers heads have teeth for clamping tissue and pliers tips for cutting tissue. In addition to the teeth and pliers tips, the first and second pliers heads are provided with an insulating layer at other positions. The insulating layer is a frosted insulating layer. The pull rod is provided with a plastic coating layer, and the plastic coating layer extends to a position close to the hinge of the pull rod and the first pliers head.

[0015] Beneficial effects:

[0016] (1) The pull rod driving structure of the present invention ensures the linear motion of the pull rod and reduces the wear of the pull rod;

[0017] (2) In the bipolar insulated surgical forceps mechanism, the structure of the swinging member + support seat of the pull rod driving structure of the present invention ensures that the pull rod moves in a straight line, reducing the contact probability between the pull rod and the clamp seat from the perspective of movement form; in addition, the inner diameter of the second insulating sleeve between the pipe fitting and the pull rod is larger than the inner diameter of the pull rod, and the inner diameter of the second insulating sleeve is smaller than the inner diameter of the clamp seat. The technical feature is that the pull rod will not contact the clamp seat, preventing the pull rod from rubbing against the clamp seat after swinging, and even wearing away the plastic coating to cause breakdown, thereby ensuring isolation between the pull rod and the clamp seat from the perspective of physical structure, thereby ensuring better isolation effect; moreover, the inner diameter of the second insulating sleeve is larger than the inner diameter of the pull rod, and the inner diameter of the second insulating sleeve is smaller than the inner diameter of the clamp seat, thereby preventing the pull rod from being over-positioned and ensuring smooth movement of the pull rod;

[0018] (3) The present invention uses an insulating member to achieve insulation between the two clamp heads, which has the advantages of high hardness, high wear resistance, high adhesion, high temperature resistance, high insulation performance, and long service life. In addition, there is an insulating sleeve between the pull rod and the pipe fitting, and a plastic coating is provided on the pull rod. The withstand voltage between the two clamp heads can reach 1800V, which is safe and reliable.

[0019] (4) There are several guide columns and guide grooves between the slider and the fixed handle to ensure the movement accuracy of the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a front view of the pull rod drive structure of Example 1 of the present invention;

[0022] Figure 2 It is a first perspective view of the pull rod driving structure of embodiment 1 of the present invention;

[0023] Figure 3 A second perspective view of the pull rod driving structure of embodiment 1 of the present invention;

[0024] Figure 4 is a structural diagram of the first handle;

[0025] Figure 5 is a structural diagram of the second handle;

[0026] Figure 6 It is an assembly stereoscopic structure of the first clamp head, the first insulating member and the second insulating member. Figure 1 ;

[0027] Figure 7It is an assembly stereoscopic structure of the first clamp head, the first insulating member and the second insulating member. Figure 2 ;

[0028] Figure 8 It is an assembled front view of the first clamp head, the first insulating member and the second insulating member;

[0029] Figure 9 for Figure 8 Cross-sectional view along AA;

[0030] Figure 10 for Figure 8 Cross-sectional view along CC;

[0031] Figure 11 A structural diagram of the first clamp head;

[0032] Figure 12 Another structural diagram of the first clamp head;

[0033] Figure 13 It is a front cross-sectional view of the overall structure of the bipolar insulation assembly;

[0034] Figure 14 for Figure 13 A partial enlarged view of point B in the middle;

[0035] Figure 15 It is a side view of the overall structure of the bipolar insulation assembly;

[0036] Figure 16 It is a partial cross-sectional view of the overall structure of the bipolar insulation assembly from the front;

[0037] Figure 17 It is a three-dimensional diagram of the pull rod driving structure of embodiment 2 of the present invention.

[0038] Among them, 1. first pliers head, 11. first leg, 12. second leg, 2. second pliers head, 3. first insulating member, 31. through hole, 32. first accommodating groove, 4. second insulating member, 41. second accommodating groove, 5. pipe fitting, 6. pull rod, 61. protrusion, 7. pliers seat, 8. first insulating sleeve, 9. second insulating sleeve, 10. fixed handle, 101. guide groove, 102. first handle, 103. second handle, 20. movable handle, 30. slider, 31. guide column, 40. connecting rod assembly, 401. first connecting rod, 402. second connecting rod, 50. swinging member, 51. slot, 60. guide block, 61. wedge surface, 70. support seat. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0042] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] Example 1:

[0046] like Figures 1 to 5 A pull rod drive structure of the present invention includes a fixed handle 10 and a movable handle 20. The fixed handle 10 is formed by splicing a first side handle 102 and a second side handle 103. A pull rod 6 is slidably provided on the fixed handle 10. A slider 30 that slides along the axial direction of the pull rod 6 is provided on the fixed handle 10. A connecting rod assembly 40 is provided between the slider 30 and the movable handle 20. The slider 30 is connected to a swinging member 50 for pulling or releasing the pull rod 6. The rotation center axis of the swinging member 50 is perpendicular to the axial direction of the pull rod 6.

[0047] The swing member 50 has a slot 51. When the slider 30 moves away from the pull rod 6, the swing member 50 swings, causing the slot 51 to engage the protrusion 61 at the end of the pull rod 6. A return spring is connected between the slider 30 and the fixed handle 10, and after the slider 30 is reset, the protrusion 61 is disengaged from the slot 51. In the present invention, the protrusion 61 is a spherical protrusion.

[0048] The swinging member 50 is rotatably connected to the slider 30. A drive mechanism is also provided within the fixed handle 10 for driving the swinging member 50 to swing as the slider 30 slides. The drive mechanism can be self-driven (e.g., driven by a motor). In the present invention, a mechanical drive mechanism is employed. The drive mechanism includes a guide block 60 fixedly connected to the fixed handle 10. The guide block 60 is provided with a wedge surface 61 for causing the swinging member 50 to swing toward the pull rod 6 while sliding with the slider 30. A spring is provided between the swinging member 50 and the slider 30 to reset the swinging member 50.

[0049] The connecting rod assembly 40 includes a first connecting rod 401 and a second connecting rod 402. One end of the first connecting rod 401 is hinged to the fixed handle 10, and the other end of the first connecting rod 401 is hinged to the movable handle 20. One end of the second connecting rod 402 is hinged to the first connecting rod 401, and the second end of the second connecting rod 402 is hinged to the slider 30. The first connecting rod 401 contacts the slider 30 and transmits power to the slider 30. To ensure smooth transmission between the two, a groove is formed on one side of the slider 30, and the first connecting rod 401 is placed in the groove of the slider 30. When the movable handle 20 is grasped, the first connecting rod 401 drives the slider 30 to slide. When the movable handle 20 is released, the slider 30's return spring causes the slider 30 to return to its original position, and the slider 30 drives the first connecting rod 401 to return to its original position.

[0050] A support seat 70 is fixed to the slider 30 for supporting the pull rod 6 in the direction of the swing member 50. The support seat 70 can be a telescopic support column, that is, a spring is provided between the support column and the slider 30. When the pull rod 6 is inserted, the protrusion 61 of the pull rod 6 causes the support column to retract. The pull rod 6 continues to be inserted, and the support column extends and presses on a rod smaller than the protrusion behind the protrusion 61 of the pull rod 6, thereby supporting the pull rod 6 from below to prevent it from shaking. In cooperation with the swing member 50, the pull rod 6 is limited to prevent it from loosening.

[0051] The slider 30 is provided with several guide posts 31, and the fixed handle 10 is provided with guide grooves 101 that match the guide posts 31. The fixed handle 10 is formed by the splicing and fixing of a first handle 102 and a second handle 103. The first handle 102 and the second handle 103 are both provided with guide grooves 101. Furthermore, the guide posts 31 are not aligned in a straight line, and one of the guide posts 31 also serves as the hinge of the swing member 50, thereby achieving a more integrated structure.

[0052] The present invention also provides a bipolar insulated surgical forceps mechanism, comprising the above-mentioned pull rod driving structure, such as Figures 6 to 16, also includes a bipolar insulated pliers head and a pipe fitting 5 connected to the fixed handle 10, the pipe fitting 5 includes a mounting sleeve and a steel pipe, and a pull rod 6 is movably arranged in the pipe fitting 5. The bipolar insulated pliers head includes a first pliers head 1 and a second pliers head 2. An insulating assembly is provided between the first pliers head 1 and the second pliers head 2. The insulating assembly includes a first insulating part 3 and a second insulating part 4. In the present invention, the first insulating part 3 and the second insulating part 4 are fixed by snapping. Of course, if for the sake of safety, the first insulating part 3 and the second insulating part 4 can be reinforced by glue after being snapped fixed. The first insulating member 3 is provided with a through hole 31 for rotatably connecting with the second pliers head 2. The first insulating member 3 and the second insulating member 4 cooperate to partially wrap the first pliers head 1. The first insulating member 3 is provided with a first receiving groove 32 for accommodating the second insulating member 4. The end surface of the second insulating member 4 facing the first insulating member 3 is provided with a second receiving groove 41 for inserting the first pliers head 1. The shape of the second receiving groove 41 matches the first pliers head 1. The depth of the first receiving groove 32 is set along the axial direction of the through hole 31. The second insulating member 4 and the first pliers head 1 both conflict with the bottom of the first receiving groove 32 of the first insulating member 3. The first pliers head 1 has a first leg 11 and a second leg 12. The second leg 12 and the first leg 11 are respectively located in the through hole 31 On both sides, the pull rod 6 is hinged to the first clamp head 1, and a clamp seat 7 is installed at the first end of the pipe fitting 5. The clamp seat 7 can be fixed to the steel pipe thread of the pipe fitting 5. The second clamp head 2 is hinged to the clamp seat 7, and the second end of the pipe fitting 5 is provided with a first insulating sleeve 8 for guiding the pull rod 6. The clamp seat 7 is provided with a second insulating sleeve 9 for limiting the pull rod 6. The surfaces of the pipe fitting 5 and the clamp seat need to be insulated by spraying or wrapping insulating materials.

[0053] The inner diameter of the second insulating sleeve 9 is larger than the inner diameter of the pull rod 6 , and the inner diameter of the second insulating sleeve 9 is smaller than the inner diameter of the clamp seat 7 .

[0054] The first pliers head 1 and the second pliers head 2 have teeth for clamping tissue and pliers tips for cutting tissue. Except for the teeth and the pliers tips, the first pliers head 1 and the second pliers head 2 are provided with an insulating layer at other positions. The insulating layer is a frosted insulating layer. The pull rod 6 is provided with a plastic coating layer, and the plastic coating layer extends to the hinge position near the pull rod 6 and the first pliers head 1.

[0055] In addition to the structure of embodiment 1, the swing member 50 may also have other structures, for example, the swing member 50 is rotatably connected to the fixed handle 10, and the swing member 50 is transmission-connected to the slider 30. Two embodiments are used to illustrate this:

[0056] Example 2:

[0057] The swinging member 50 of this embodiment is rotatably connected to the fixed handle 10, and the swinging member 50 is connected to the slider 30 through an intermediate connecting rod. Specifically, the swinging block 50 is hinged to the intermediate connecting rod, and the intermediate connecting rod is hinged to the slider 30. When the slider 30 slides, it drives the swinging member 50 to rotate so as to buckle the protrusion 61 of the pull rod 6. The swinging member 50 can also adopt the form of a slot as in Example 1. When the swinging member 50 rotates, the slot clamps the protrusion 61 of the pull rod 6, and then pulls the pull rod 6. Because the protrusion 61 has a certain size, when the swinging member 50 rotates at a small angle, the slot will not disengage from the protrusion 61, and the slider 30 is reset under the action of the reset spring, and the slider 30 drives the swinging member 50 to rotate in the opposite direction until the pull rod 6 is freed from the slot. The slider 30 of this embodiment is smaller than the slider 30 of Example 1 because it needs to avoid the intermediate connecting rod. The other structures of this embodiment are the same as those of Example 1.

[0058] Example 3:

[0059] The swing member 50 of this embodiment is rotatably connected to the fixed handle 10 , and the swing member 50 is transmission-connected to the slider 30 by means of tooth engagement or the like. Other aspects are the same as those of the second embodiment.

[0060] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A pull rod drive structure, characterized in that : It comprises a fixed handle (10) and a movable handle (20), wherein a pull rod (6) is slidably provided on the fixed handle (10), a slider (30) is provided on the fixed handle (10) and slides along the axial direction of the pull rod (6), a connecting rod assembly (40) is provided between the slider (30) and the movable handle (20), and the slider (30) is connected to a swinging member (50) for pulling or releasing the pull rod (6), and the rotation center axis of the swinging member (50) is perpendicular to the axial direction of the pull rod (6); a slot (51) is provided on the swinging member (50), and when the slider (30) moves in a direction away from the pull rod (6), the swinging member (50) swings so that the slot (51) clamps the convex portion of the end of the pull rod (6), a reset spring is connected between the slider (30) and the fixed handle (10), and after the slider (30) is reset, the convex portion is disengaged from the slot (51); the swinging member (50) is rotatably connected to the slider (30), and a connecting rod assembly (40) is provided in the fixed handle (10). There is a driving mechanism for driving the swinging member (50) to swing during the sliding process of the slider (30); the driving mechanism includes a guide block (60) fixedly connected to the fixed handle (10), the guide block (60) is provided with a wedge surface (61) for prompting the swinging member (50) to swing toward the pull rod (6) while following the sliding of the slider (30), and a spring is provided between the swinging member (50) and the slider (30) to reset the swinging member (50); the connecting rod assembly (40) includes a first connecting rod (401) and a second connecting rod (402), one end of the first connecting rod (401) is hinged to the fixed handle (10), the other end of the first connecting rod (401) is hinged to the movable handle (20), one end of the second connecting rod (402) is hinged to the first connecting rod (401), and the second end of the second connecting rod (402) is hinged to the slider (30), and the first connecting rod (401) and the slider (30) are in contact and transmit power to each other; A support seat (70) is fixed on the slider (30) for supporting the pull rod (6) in the direction of the swinging member (50).

2. The pull rod drive structure according to claim 1, characterized in that: The sliding block (30) is provided with a plurality of guide posts (31), and the fixed handle (10) is provided with guide grooves (101) matching the guide posts (31).

3. A bipolar insulated surgical forceps mechanism, characterized in that: The invention comprises a pull rod driving structure as claimed in claim 1 or 2, and further comprises a bipolar insulating pliers head and a pipe fitting (5) connected to a fixed handle (10), wherein the pull rod (6) is movably arranged in the pipe fitting (5), the bipolar insulating pliers head comprises a first pliers head (1) and a second pliers head (2), an insulating assembly is provided between the first pliers head (1) and the second pliers head (2), the insulating assembly comprises a first insulating part (3) and a second insulating part (4) which are fixedly connected, the first insulating part (3) is provided with a through hole for rotatably connecting with the second pliers head (2), the first insulating part (3) and the second insulating part (4) cooperate to wrap the first pliers head (1), the first insulating part (3) is provided with a first accommodating groove (32) for accommodating the second insulating part (4), and the end face of the second insulating part (4) facing the first insulating part (3) is provided with a groove for accommodating the first pliers head (1) ), the shape of the second accommodating groove (41) matches the first pliers head (1), the depth of the first accommodating groove (32) is set along the axial direction of the through hole, the second insulating member (4) and the first pliers head (1) both conflict with the bottom of the first accommodating groove (32) of the first insulating member (3), the first pliers head (1) has a first leg (11) and a second leg (12), the second leg (12) and the first leg (11) are respectively located on both sides of the through hole, the pull rod (6) is hinged to the first pliers head (1), the first end of the pipe (5) is equipped with a clamp seat (7), the second pliers head (2) is hinged to the clamp seat (7), the second end of the pipe (5) is provided with a first insulating sleeve (8) for guiding the pull rod (6), and the clamp seat (7) is provided with a second insulating sleeve (9) for limiting the pull rod (6).

4. A bipolar insulated surgical forceps mechanism according to claim 3, characterized in that: The inner diameter of the second insulating sleeve (9) is larger than the inner diameter of the pull rod (6), and the inner diameter of the second insulating sleeve (9) is smaller than the inner diameter of the clamp seat (7).

5. The bipolar insulated surgical forceps mechanism according to claim 3, characterized in that: The first pliers head (1) and the second pliers head (2) are provided with teeth for clamping tissue and pliers tips for cutting tissue. In addition to the teeth and pliers tips, the first pliers head (1) and the second pliers head (2) are provided with an insulating layer at other positions, wherein the insulating layer is a frosted insulating layer. The pull rod (6) is provided with a plastic coating layer, and the plastic coating layer extends to a hinge position close to the pull rod (6) and the first pliers head (1).

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