A push rod adaptive structure

Abstract

The present application relates to a push rod adaptive structure, including multiple push rods, a center rod joint and a push rod joint, wherein the multiple push rods are installed in the center rod joint through the push rod joint, wherein when the multiple push rods have a front-to-back misalignment, the push rod joint can compensate for the misalignment through rotational movement, so that the multiple push rods are always in contact with the push rod joint at the same time. The push rod adaptive structure of the present application is applied to rotary instrument products, improves the force of the flexible push rod in the instrument, ensures that the multiple push rods can be evenly stressed during the movement, reduces the deformation of the single-piece push rod, and ensures the smooth movement of the firing push rod.

Description

Technical Field

[0001] The present application relates to an adaptive structure for a rotary instrument, wherein the rotary instrument is a rotary laparoscopic cutting stapler, and the present application specifically relates to an adaptive structure of a push rod in the rotary laparoscopic cutting stapler. Background Art

[0002] Staplers are the main medical devices used in medicine to replace traditional manual suturing. They are easy to use, fast, tight, moderately tight, and have few side effects and surgical complications. Among them, the head end of the rotary laparoscopic cutting stapler can be rotated, which can be more flexibly applied to more anastomotic areas, such as open or laparoscopic resection, transection and anastomosis of lung, stomach and intestinal tissues.

[0003] In a rotary laparoscopic stapler, a flexible firing push rod is a necessary component to achieve the turning function. Currently, the joints of the push rods in rotary staplers in the industry are basically several push rods connected to a flat joint, such as Figure 1 As shown. In this rotary stapler, when the stapler jaws are in a straight line state, several push rods are in contact with the flat joint at the same time, and several push rods are subjected to the thrust from the flat joint at the same time. Figure 2 As shown; but when the stapler jaws rotate, Figure 1 As shown in the figure, the push rod will bend and deform. At this time, due to the difference in inner and outer diameters caused by the bending, there will be a front-to-back error between the push rods, resulting in only one push rod among several push rods contacting this plane, as shown in the figure. Figure 3 As shown, there is only one push rod to bear the thrust from the plane joint, which causes the push rod to undergo relatively large deformation, making the push rod not smooth during forward and backward movement, and posing a greater challenge to the push rod. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide an adaptive push rod structure with a unique structural design for use in rotary instruments in response to the deficiencies in the prior art. The present application can improve the force applied to the flexible push rod in the rotary instrument, ensure that multiple push rods can be evenly stressed during movement, reduce deformation of a single push rod, and ensure smooth movement of the firing push rod.

[0005] According to the present application, a push rod adaptive structure is provided, comprising a plurality of push rods, a center rod joint and a push rod joint, wherein the plurality of push rods are installed in the center rod joint via the push rod joint, wherein when the plurality of push rods have front and rear misalignments, the push rod joint can compensate for the misalignments through rotational movement, so that the plurality of push rods are always in contact with the push rod joint at the same time.

[0006] Furthermore, the plurality of push rods are 3 inner push rods and 2 outer push rods.

[0007] Furthermore, the plurality of push rods are 2 inner push rods and 2 outer push rods.

[0008] Furthermore, the plurality of push rods include one inner push rod and two outer push rods.

[0009] Furthermore, a joint installation component is provided at the proximal ends of the plurality of push rods, and the push rod joint is connected to the push rod via the joint installation component.

[0010] Furthermore, the push rod joint has at least a portion of a cylindrical section, and the center rod joint has a cylindrical cut hole matching the cylindrical section of the push rod joint, the center axis of the cylindrical cut hole is located in the vertical direction, and the push rod joint can be installed in the cylindrical cut hole and can rotate around its center axis in the cut hole.

[0011] Furthermore, the joint mounting component of the push rod is a cross mounting hole located at the proximal end of the push rod.

[0012] Furthermore, the joint mounting component of the push rod is an I-shaped mounting hole located at the proximal end of the push rod.

[0013] Furthermore, the push rod joint is formed by cutting off a part of a cylinder, so that the push rod joint can be stuck in the cross or I-shaped mounting hole.

[0014] Specifically, the cut-out parts on the push rod joint are four parts that are symmetrical in the up and down, far and near directions. Each cut-out part is cut in a direction parallel to the central axis of the cylinder but not passing through the central axis and in a direction perpendicular to the central axis but not passing through the central axis, so that the upper and lower sides of the push rod joint are both knob-shaped, including a cylindrical section located in the middle area, and knob sections located at the upper and lower ends.

[0015] Furthermore, the larger upper and lower distances of the cross mounting hole are slightly larger than the maximum height of the push rod joint, and the larger distance from the proximal end to the distal end of the cross mounting hole is slightly larger than the cylindrical diameter of the center rod joint; the width of the knob section on the push rod joint is basically consistent with the smaller width from the proximal end to the distal end of the cross hole, and a pulling force or a pushing force is generated on the knob section when the push rod moves back and forth. When the push rod bends, the forces generated by each push rod are different, so that the push rod joint can rotate freely in the cylindrical cut hole in the center rod joint, so that when the multiple push rods are misaligned front and back, the push rod joint can compensate for the misalignment through rotational movement, so that the multiple push rods are in contact with the push rod joint at the same time.

[0016] Furthermore, the center rod joint also includes a first groove along its longitudinal axis, the first groove is connected to the cylindrical cut hole, the distal end of the first groove is open, and the proximal end is closed; when the push rod joint is inserted into the cylindrical cut hole of the center joint, the proximal end of the push rod is located at the closed proximal end of the first groove.

[0017] The push rod adaptive structure of the present application is used in a rotary instrument, which improves the force applied to the flexible push rod in the instrument, ensures that multiple push rods can be evenly stressed during movement, reduces the deformation of a single push rod, and ensures the smooth movement of the firing push rod.

[0018] Furthermore, the push rod adaptive structure of the present application is applied in a rotary laparoscopic stapler product, which improves the force on the flexible firing push rod in the stapler, ensures that multiple push rods can be evenly stressed during the firing process, reduces the deformation of the single-piece push rod, and ensures the smooth movement of the firing push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the bending and assembly of the stapler jaws;

[0021] Figure 2 It is a joint form of a rotary stapler in the prior art;

[0022] Figure 3 It is a schematic diagram of the state of the push rod of the rotary stapler in the prior art when there is a front-to-back misalignment;

[0023] Figure 4 is a schematic diagram of the assembly of the push rod according to the present application;

[0024] Figure 5 This is a schematic diagram of the structure when the push rod is in a normal state in this application;

[0025] Figure 6 This is a schematic diagram of the structure when the push rod is in a front-to-back misalignment in this application.

[0026] In the figure: 1, 5: outer push rods; 2-4: inner push rods; 6: push rod joint; 7: center rod joint. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration". Any implementation described herein as "exemplary" is not necessarily to be interpreted as being superior or superior to other implementations. Moreover, "proximal", "proximal side", and "rear" herein refer to the end close to the operator, and "distal", "distal side", and "front" refer to the end away from the operator, and the entire device is placed horizontally.

[0029] For the sake of simplicity, the rotary laparoscopic cutting stapler is used as an example to illustrate the device of the present application. Those skilled in the art can understand that the push rod adaptive structure of the present application is not limited to the rotary laparoscopic cutting stapler, but is also applicable to other rotary devices.

[0030] The push rod adaptive structure according to the present application includes a plurality of push rods, Figure 4 There are five push rods in the figure. Those skilled in the art will easily understand that the number of push rods is only illustrative and can be selected according to needs. Figure 4 Among the five push rods, those located on both sides are outer push rods 1 and 5, and those located in the middle are inner push rods 2, 3, and 4. The five push rods 1-5 are installed in the center rod joint 7 through the push rod joint 6. Specifically, a joint installation component is provided at the proximal end of the push rods 1-5, and the push rod joint 6 is fixedly connected to the push rods through the joint installation component. The push rod joint 6 has at least a part of a cylindrical section, and the center rod joint 7 has a cylindrical cut hole matching the cylindrical section of the push rod joint 6, and the central axis of the cylindrical cut hole is located in the vertical direction. The push rod joint 6 can be installed in the cylindrical cut hole and can rotate around its central axis in the cut hole.

[0031] Figure 4 The joint installation part of the middle push rod is a cross mounting hole located at the proximal end of the push rod. The push rod joint 6 is formed by cutting out a part of the cylinder, so that the push rod joint 6 can be stuck in the cross mounting hole. The cut-out part on the push rod joint 6 is four parts that are symmetrical in both up and down and near and far directions. Each cut-out part is cut in a direction parallel to the central axis of the cylinder but not passing through the central axis and in a direction perpendicular to the central axis but not passing through the central axis, so that the upper and lower sides of the push rod joint 6 are both knob-shaped, specifically including a cylindrical section located in the middle area, and a knob section located at the upper and lower ends. The maximum distance between the upper and lower sides of the cross mounting hole on the push rod is slightly larger than the maximum height of the push rod joint 6, and the maximum distance from the proximal end to the distal end of the cross mounting hole is slightly larger than the cylindrical diameter of the center rod joint 6. The width of the knob section on the push rod joint 6 is basically consistent with the smaller width from the proximal end to the distal end of the cross hole. When the push rod moves forward and backward, it will generate a pulling force or a pushing force on the knob section. When the push rod is bent, the forces generated by each push rod are different, so that the push rod joint 6 can rotate freely in the cylindrical cut hole in the center rod joint 7. Therefore, when the five push rods are misaligned front and back, the push rod joint can compensate for the misalignment through rotational movement, so that the five push rods 1-5 are in contact with the push rod joint 6 at the same time.

[0032] It is easy for a person skilled in the art to understand that the cross mounting hole at the proximal end of the push rod in the present application can also be designed into other shapes, such as an I-shape, as long as the push rod joint can be fixed on the push rod and the rotation of the push rod joint can cause the front and rear misalignment of each push rod.

[0033] See attached Figure 4-6 The center rod joint 7 further comprises a first groove along its longitudinal axis, the first groove being connected to the cylindrical cut hole, the distal end of the first groove being open, and the proximal end being closed. When the push rod joint 6 is inserted into the cylindrical cut hole of the center joint 7, the proximal end of the push rod is located at the closed proximal end of the first groove, see the attached Figure 5 , 6 .

[0034] See Appendix for further information. Figure 5-6 When the center rod joint 7 moves in the direction of the arrow, the center rod joint 7 transmits the force to the push rod joint 6, and the push rod joint 6 transmits the force to the outer push rods 1, 5 and the inner push rods 2, 3, 4. When the outer push rods 1, 5 and the inner push rods 2, 3, 4 are in a normal state, the force-bearing surfaces of the outer push rods 1, 5 and the inner push rods 2, 3, 4 are aligned with each other and jointly bear the force from the push rod joint 6, such as Figure 5 When the outer push rods 1, 5 and the inner push rods 2, 3, 4 are misaligned, the push rod joint 6 will rotate in the center rod joint 7 to adapt to and compensate for the misalignment of the five push rods. At this time, the push rod joint is still in contact with the five push rods at the same time. Figure 6 .

[0035] The push rod adaptive structure of the present application is applied in the rotary laparoscopic stapler product, which improves the force of the flexible firing push rod in the stapler, ensures that multiple push rods can be evenly stressed during the firing process, reduces the deformation of the single-piece push rod, and ensures the smooth movement of the firing push rod.

[0036] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A push rod adaptive structure of an instrument, comprising a plurality of push rods, a center rod joint and a push rod joint, wherein the plurality of push rods are installed in the center rod joint through the push rod joint, wherein when the plurality of push rods have a front-to-back misalignment, the push rod joint can compensate for the misalignment through adaptive movement, so that the plurality of push rods are always in contact with the push rod joint at the same time; The push rod joint has at least a portion of a cylindrical section, and the center rod joint has a cylindrical cut hole matching the cylindrical section of the push rod joint, the center axis of the cylindrical cut hole is located in the vertical direction, and the push rod joint can be installed in the cylindrical cut hole and can rotate around its center axis in the cut hole.

2. The push rod adaptive structure according to claim 1, wherein the push rod joint is rotatable relative to the center rod joint to compensate for the misalignment. 3 . The push rod adaptive structure according to claim 2 , wherein the proximal ends of the plurality of push rods are provided with joint mounting components, and the push rod joints are connected to the push rods via the joint mounting components.

4. According to the push rod adaptive structure of claim 3, the joint mounting component of the push rod is a mounting hole located at the proximal end of the push rod.

5. The push rod adaptive structure according to claim 4, wherein the push rod joint is formed by cutting off a part of a cylinder, so that the push rod joint can be stuck in the mounting hole.

6. According to the push rod adaptive structure according to claim 5, the cut-out parts on the push rod joint are four parts that are symmetrical in up and down, far and near directions, and each cut-out part is cut through a direction parallel to the central axis of the cylinder but not passing through the central axis and a direction perpendicular to the central axis but not passing through the central axis, so that the upper and lower sides of the push rod joint are both knob-shaped, including a cylindrical section located in the middle area, and knob sections located at the upper and lower ends.

7. According to the push rod adaptive structure of claim 6, the larger upper and lower distances of the mounting hole are slightly larger than the maximum height of the push rod joint, and the larger distance from the proximal end to the distal end of the mounting hole is slightly larger than the cylindrical diameter of the center rod joint; the width of the knob section on the push rod joint is basically consistent with the smaller width from the proximal end to the distal end in the mounting hole, and a pulling force or a pushing force is generated on the knob section when the push rod moves back and forth. When the push rod bends, the forces generated by each push rod are different, so that the push rod joint can rotate freely in the cylindrical cut hole in the center rod joint, so that when the multiple push rods are misaligned front and back, the push rod joint can compensate for the misalignment through rotational movement, so that the multiple push rods are in contact with the push rod joint at the same time.

8. According to the push rod adaptive structure according to any one of claims 4-7, the center rod joint also includes a first groove along its longitudinal axis, the first groove is connected to the cylindrical cut hole, the distal end of the first groove is open, and the proximal end is closed; when the push rod joint is inserted into the cylindrical cut hole of the center joint, the proximal end of the push rod is located at the closed proximal end of the first groove.

9. According to any one of claims 3 to 7, the push rod adaptive structure, the joint mounting component of the push rod is a cross mounting hole or an I-shaped mounting hole located at the proximal end of the push rod.

10. A rotary surgical instrument comprising the push rod adaptive structure according to any one of claims 1 to 7, characterized in that: The surgical instrument includes a push rod adaptive structure.

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