A stapler cutter with safety function and a stapler cutter

Abstract

This invention discloses a stapler cutter and stapler cutter with a safety function. The stapler cutter includes a cutter head and a cutter body, which are connected in a relatively movable manner. This invention's stapler cutter and stapler cutter with a safety function effectively prevent the cutter head from re-entering the staple cartridge due to operational errors when the stapler cutter is not in a cutting state. Furthermore, the component implementing the safety function has a compact structure, occupies little space in the staple cartridge, and facilitates smooth cutting and suturing operations.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a stapler cutter and stapler cutter with a safety function. Background Technology

[0002] The laparoscopic anastomosis cutter is a commonly used cutting and suturing tool in clinical surgery. It mainly consists of a staple cartridge, a staple pusher slider, a cutting blade, a blade housing, and an advance rod. In use, the advance rod is pushed forward, and the cutting blade and the staple pusher slider slide in the staple cartridge under the action of the advance rod, thereby completing the cutting and suturing action. After completing the cutting and suturing action, the cutting blade generally needs to be retracted to its original position.

[0003] When the cutting blade is not in the cutting state, the blade tip should be prevented from re-entering the staple cartridge due to operational errors. In this case, a safety mechanism is often required in the staple cartridge or blade housing.

[0004] Although existing laparoscopic anastomosis cutters are designed with a safety mechanism, the structure of the safety mechanism is complex and takes up a lot of space, which can easily lead to uneven cutting and suturing movements.

[0005] Chinese Patent: A stapler cutting blade mechanism and stapler CN212661859U, in which a cutting blade is movably connected to the staple pusher slider in the staple chamber, and an elastic unit is provided on the staple pusher slider to ensure that the cutting blade is hidden in the non-cutting state. In this technical solution, the cutting blade and the cutting blade holder are separate structures. After the cutting and suturing actions are completed, the cutting blade and the staple pusher slider remain in the staple chamber, and the cutting blade and the staple pusher slider can be discarded together with the staple chamber. However, this structure still has defects: 1. Because the cutting blade and the cutting blade holder are separate, during the cutting and suturing actions, due to the resistance of the cut tissue, if the cutting blade holder retracts even slightly, a gap will be created between the cutting blade holder and the cutting blade, and the tissue can easily squeeze into the gap, thus affecting the cutting and suturing actions; 2. The cutting blade, the staple pusher slider, and the elastic component all move within the staple chamber, occupying a large amount of space, which is not conducive to the cutting and suturing actions.

[0006] As can be seen from the aforementioned patent documents, the separate structure of the cutting head and body (i.e., the cutting blade and cutting blade holder mentioned in the documents) of the cutting knife has many drawbacks. Therefore, the cutting head and body of existing anastomosis device cutting knives mostly adopt an integrated structure, mainly including the cutting head and body being welded together or connected by a snap-fit ​​method.

[0007] Chinese patent CN211213308U describes a novel stapler cutter. The cutter's connecting component includes a protrusion and a groove, one on the cutter head and the other on the cutter body. A drawback of this type of stapler cutter is that the cutter head cannot swing up and down. When cutting thicker tissue, the cutting resistance is significant. Furthermore, if the increased resistance at the cutter head is combined with the increased thrust from the rear of the push rod, the entire stapler cutter risks disintegrating. Summary of the Invention

[0008] The purpose of this invention is to provide a stapler cutter and stapler cutter with a safety function, which can effectively prevent the cutter head from re-entering the staple cartridge due to operational errors when the cutter is not cutting; and the component that realizes the safety function has a compact structure, occupies little space in the staple cartridge, and is conducive to the smooth operation of cutting and suturing.

[0009] To achieve the above objectives, the technical solution of the present invention is to design a stapler cutting knife with a safety function, comprising a blade head and a blade body, wherein the blade head and the blade body form a relative motion connection.

[0010] Furthermore, the blade head can swing up and down or swing left and right relative to the blade body, or slide up and down or slide left and right.

[0011] Furthermore, the connection between the cutter head and the cutter body can be one or more of the following: slot connection, pin connection, spherical connection, or sliding groove connection.

[0012] Furthermore, it also includes a movable component for assisting the movement of the cutter head; the movable component is disposed on the cutter head or cutter body, or disposed outside the cutter head or cutter body.

[0013] Furthermore, the movable part of the cutter head includes a structure that pulls the cutter head to move by a tension spring, a structure that attracts the cutter head to move by magnetic attraction, a structure that installs a coaxial gear on the cutter head and sets a rack that is fixed in a position relative to the cutter body, the gear meshes with the rack and the cutter head moves by the gear rotating relative to the rack, or a structure that lifts or presses the cutter head up by an arc-shaped spring.

[0014] Furthermore, the blade is composed of several outer blades and several inner blades, with the outer blades located outside the inner blades; at the connection point between the blade and the blade head, the inner and outer blades are welded together as a single unit.

[0015] Furthermore, the inner blade, outer blade, and blade head form a cylindrical hinge connection. The hinge surface of the outer blade is larger than that of the inner blade. The hinge surface of the outer blade restricts the left and right movement between the blade head and the inner blade, so that the blade head can only swing up and down (this structure is applied to Embodiment 1).

[0016] An anastomosis cutter equipped with the aforementioned cutting blade includes a staple cartridge, a blade housing, a cutting blade, and a push rod. A staple pusher slider is provided inside the staple cartridge. The rear end of the staple cartridge is connected to the blade housing, and the rear end of the cutting blade is connected to the push rod. The cutting blade and the push rod slide within a sliding cavity of the blade housing, and the cutting tip and the staple pusher slider slide within a sliding cavity of the staple cartridge. The sliding cavities of the staple cartridge and the blade housing are not on the same axial direction (specifically including two situations: 1. They are not at the same horizontal height, i.e., the sliding cavity of the staple cartridge is higher or lower than the sliding cavity of the blade housing. Correspondingly, after the cutting tip leaves the sliding cavity of the blade housing, it needs to be raised or lowered before it can enter the sliding cavity of the staple cartridge; 2. They are at the same horizontal height, but the sliding cavity of the staple cartridge is offset to the left or right from the sliding cavity of the blade housing. Correspondingly, after the cutting tip leaves the sliding cavity of the blade housing, it needs to be swung to the left or right before it can enter the sliding cavity of the staple cartridge).

[0017] The cutting blade has a front groove at the front end of the blade head, the blade is inside the front groove, and a protruding structure is provided at the upper end of the front groove; the pusher slider has a recess at the rear end, and the protruding structure on the blade head can be inserted into the recess at the rear end of the pusher slider.

[0018] The advantages and beneficial effects of the present invention are as follows: the stapler cutter and stapler cutter with safety function of the present invention can effectively prevent the cutter head from re-entering the staple cartridge due to operation error when the stapler cutter is not cutting; and the component that realizes the safety function has a small structure and occupies little space in the staple cartridge, which is conducive to the smooth progress of cutting and suturing operations. Attached Figure Description

[0019] Figure 1 This is an exploded view of the cutting blade of Example 1.

[0020] Figure 2 This is a partially enlarged exploded view of the cutting blade in Example 1.

[0021] Figure 3 This is a side and top cross-sectional view of the cutting blade in Example 1.

[0022] Figure 4 This is a cross-sectional schematic diagram of the cutter in Example 1.

[0023] Figure 5 This is a partially enlarged cross-sectional view of the cutter in Example 1.

[0024] Figure 6 This is an exploded view of the cutting blade in Example 2.

[0025] Figure 7 This is a partially enlarged cross-sectional view of the cutter in Example 2.

[0026] Figure 8 This is an exploded view of the cutting blade in Example 3.

[0027] Figure 9 This is a partially enlarged cross-sectional view of the cutter in Example 3.

[0028] The components include: 1. Cutting head; 2. Outer blade; 2-1. Outer blade retaining connector; 3. Inner blade; 3-1. Inner blade retaining connector; 4. Movement gap; 5. Retaining groove; 6. Cutting edge; 7. Cutting edge front groove; 8. Sliding block; 9. Retaining rib; 10. Push rod; 11. Pin magazine; 12. Cutting shell; 13. Arc-shaped spring; 14. Push pin slider; 15. Direction A; 16. Direction B; 17. Direction C; 18. Diameter H of outer blade retaining connector; 19. Diameter h of inner blade retaining connector; 10. Pin shaft; 11. Pin hole; 12. Tension spring; 13. Magnet. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0030] Example 1:

[0031] See attached document Figures 1-5 As shown, the anastomosis cutter includes a staple cartridge 11, a blade housing 12, a cutting blade, and a push rod 10. A staple pusher slider 14 is provided inside the staple cartridge 11. The rear end of the staple cartridge 11 is connected to the blade housing 12, and the rear end of the cutting blade is connected to the push rod 10. The cutting blade and the push rod 10 slide in the sliding cavity of the blade housing 12. The cutting blade tip 1 and the staple pusher slider 14 slide in the sliding cavity of the staple cartridge 11. The sliding cavity of the staple cartridge 11 is slightly higher than the sliding cavity inside the blade housing 12. An arc-shaped spring piece 13 is provided at the connection between the staple cartridge 11 and the blade housing 12. The arc-shaped spring piece 13 has an arc-shaped structure, and one end of the arc-shaped spring piece 13 is connected to the sliding cavity of the blade housing 12, while the other end is suspended.

[0032] The cutting knife includes a blade head 1 and a blade body. The blade head 1 has sliding blocks 8 at its upper and lower ends, and a cutting edge groove 7 at its front end. The cutting edge 6 is located inside the cutting edge groove 7. The blade body consists of two outer blades 2 and two inner blades 3. The front ends of the outer blades 2 and inner blades 3 are respectively provided with an outer blade retaining connector 2-1 and an inner blade retaining connector 3-1. The size of the outer blade retaining connector 2-1 is slightly larger than the size of the inner blade retaining connector 3-1 (i.e., the diameter of the outer blade retaining connector 2-1 is larger). H is slightly larger than the diameter h of the inner blade retainer 3-1); the rear end of the blade head 1 is provided with a retaining groove 5 for retaining the outer blade retainer 2-1 and the inner blade retainer 3-1. A retaining rib 9 is provided in the center of the retaining groove 5, so that the inner diameter of the center of the retaining groove 5 is smaller than the inner diameter of the outer side of the retaining groove 5. The inner blade retainer 3-1 is inserted into the center of the retaining groove 5 at the rear end of the blade head 1 (i.e., the position of the retaining rib 9), and the outer blade retainer 2-1 is inserted into the outer side of the retaining groove 5 at the rear end of the blade head 1.

[0033] The outer blade retainer 2-1 and the inner blade retainer 3-1 are provided with an movable gap 4 at their upper parts, so that the blade head 1 can be lifted upward in direction A;

[0034] The upper end of the blade front groove 7 has a protruding structure; the rear end of the push pin slider 14 has a recess.

[0035] The lower part of the blade 1 is attached to the curved spring piece 13.

[0036] See attached document Figure 5 As shown, when the push rod 10 fires forward for the first time, the cutter head 1 moves forward along the arc-shaped spring 13. Under the action of the arc-shaped spring 13, the cutter head 1 is lifted along direction A. Then, the protruding structure of the cutter head 1 engages with the recess at the rear end of the pusher slider 14 along direction B. Subsequently, the cutter head 1 and the pusher slider 14 move forward together in the sliding cavity of the staple cartridge 11 (moving along direction C), thereby completing the cutting and sewing action.

[0037] After the cutting and stitching actions are completed, the push rod 10 retracts, the cutter head 1 returns to its original position, and the pusher slider 14 remains at the front end of the staple cartridge 11.

[0038] Due to the presence of the arc-shaped spring piece 13, the cutter head 1 is raised upwards, and the lower part of the cutter head 1 abuts against the rear end of the sliding cavity of the staple cartridge 11. Without the staple pusher slider 14 on the rear side of the sliding cavity of the staple cartridge 11, the cutter head 1 cannot enter the sliding cavity of the staple cartridge 11, thus achieving the safety function.

[0039] Example 2:

[0040] See attached document Figure 6 As shown, the anastomosis cutter includes a staple cartridge 11, a blade housing 12, a cutting blade, and a push rod 10. A staple pusher slider 14 is provided inside the staple cartridge 11. The rear end of the staple cartridge 11 is connected to the blade housing 12, and the rear end of the cutting blade is connected to the push rod 10. The cutting blade and the push rod 10 slide within the sliding cavity of the blade housing 12. The cutting head 1 and the staple pusher slider 14 slide within the sliding cavity of the staple cartridge 11. The sliding cavity of the staple cartridge 11 is slightly higher than the sliding cavity inside the blade housing 12.

[0041] The cutting blade includes a blade head 1 and a blade body. The front end of the blade head 1 is provided with a cutting edge groove 7, and the cutting edge 6 is inside the cutting edge groove 7. The blade body is composed of two outer blade bodies 2 and two inner blade bodies 3. The front ends of the two outer blade bodies 2 are provided with pin holes 15, and the rear end of the blade head 1 is provided with a pin shaft 15. The blade head 1 is movably connected to the pin holes 15 at the front ends of the two outer blade bodies 2 through the pin shaft 15. The front ends of the two inner blade bodies 3 are left with a movable gap with the rear end of the blade head 1. One end of the tension spring 17 is connected to the rear end of the blade head, and the other end is connected to the front end of the inner blade body 3.

[0042] The upper end of the blade front groove 7 has a protruding structure; the rear end of the push pin slider 14 has a recess.

[0043] See attached document Figure 7 As shown, when the blade head 1 is located in the sliding cavity of the blade housing 12, the blade head 1 and the blade body are restricted by the blade housing 12, so that the blade head 1 and the blade body are kept on the same axis. When the blade body is pushed, the blade head 1 is disengaged from the blade housing 12. The blade head 1 is lifted by the action of the tension spring 17. Then, the protruding structure of the blade head 1 engages with the recess at the rear end of the push pin slider 14. The recess at the rear end of the push pin slider 14 restricts the lifting range of the blade head 1, so that the blade head 1 can smoothly enter the sliding cavity of the nail cartridge 11.

[0044] After the cutting and sewing process is completed, the cutter head 1 is retracted into the cutter housing 12. Since the pusher slider 14 is already stuck at the front end of the staple cartridge 11, the range of the pull spring 17 on the cutter head 1 is increased, and the cutter head 1 cannot enter the staple cartridge 11.

[0045] Example 3:

[0046] See attached document Figure 8 As shown, the anastomosis cutter includes a staple cartridge 11, a blade housing 12, a cutting blade, and a push rod 10. A staple pusher slider 14 is provided inside the staple cartridge 11. The rear end of the staple cartridge 11 is connected to the blade housing 12, and the rear end of the cutting blade is connected to the push rod 10. The cutting blade and the push rod 10 slide within the sliding cavity of the blade housing 12. The cutting head 1 and the staple pusher slider 14 slide within the sliding cavity of the staple cartridge 11. The sliding cavity of the staple cartridge 11 is slightly higher than the sliding cavity inside the blade housing 12.

[0047] The cutting knife includes a blade head 1 and a blade body. The front end of the blade head 1 is provided with a blade front groove 7, and the blade 6 is inside the blade front groove 7. A magnet 18 is provided at the rear of the blade head 1. The blade body is composed of two outer blade bodies 2 and two inner blade bodies 3. The front end of the blade body and the blade head 1 are connected by a snap-fit ​​connection. The blade head 1 can be lifted upward along the front end of the blade body.

[0048] The upper end of the blade front groove 7 has a protruding structure; the rear end of the push pin slider 14 has a recess.

[0049] A magnet 18 is provided on the front end face of the blade housing 12, which can attract the magnet 18 at the rear of the blade head 1.

[0050] See attached document Figure 9 As shown, when the rear part of the blade head 1 is in the sliding cavity of the blade housing 12, the blade housing 12 restricts the blade head 1, preventing the rear end of the blade head 1 from lifting. At this time, the magnet 18 at the rear of the blade head 1 and the magnet 18 on the blade housing 12 are not attracted together. When the blade body is pushed, the blade head 1 is separated from the blade housing 12. The blade head 1 is lifted upward under the attraction of the magnet 18. Then, the protruding structure of the blade head 1 engages with the recess at the rear end of the pusher slider 14. The recess at the rear end of the pusher slider 14 restricts the lifting range of the blade head 1, allowing the blade head 1 to smoothly enter the sliding cavity of the nail cartridge 11.

[0051] After the cutting and sewing process is completed, the cutter head 1 is retracted into the cutter housing 12. Since the pusher slider 14 is already stuck at the front end of the staple cartridge 11, once the cutter head 1 is removed from the cutter housing 12, without the restriction of the pusher slider 14, the cutter head 1 quickly rises and is attracted to the magnet 18 at the front end of the cutter housing 12, so that the cutter head 1 cannot enter the sliding cavity of the staple cartridge 11.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A stapler cutter with a safety function, used in a stapler cutter, the stapler cutter comprising a staple cartridge, a blade housing, a cutting blade, and a push rod, wherein a staple pusher slider is provided in the staple cartridge; the rear end of the staple cartridge is connected to the blade housing, the rear end of the cutting blade body is connected to the push rod, the cutting blade body and the push rod slide within a sliding cavity of the blade housing, and the cutting blade head and the staple pusher slider slide within a sliding cavity of the staple cartridge; the cutting blade comprises a blade head and a blade body, characterized in that: The blade head and blade body are connected in a relatively movable manner. The blade body is composed of several outer blades and several inner blades, with the outer blades located outside the inner blades. At the connection point between the blade body and the blade head, the inner and outer blades are welded together as a single unit. The inner and outer blades are connected to the blade head via a cylindrical hinge, with the hinge surface of the outer blade being larger than that of the inner blade. The hinge surface of the outer blade restricts the lateral movement between the blade head and the inner blade, allowing the blade head to only swing up and down. The connection between the blade head and the blade body is one or more of the following: slot connection, pin connection, spherical connection, or sliding groove connection. The cutting blade also includes a moving part for assisting the movement of the blade head.

2. The stapler cutter with a safety function according to claim 1, characterized in that: The movable part of the cutter head is located on the cutter head or the cutter body, or is located outside the cutter head or the cutter body.

3. The stapler cutter with a safety function according to claim 2, characterized in that: The movable part of the cutter head includes a structure that pulls the cutter head to move by a tension spring, a structure that attracts the cutter head to move by magnetic attraction, a structure that installs a coaxial gear on the cutter head and sets a rack that is fixed in a position relative to the cutter body, the gear meshes with the rack and the cutter head moves by the gear rotating relative to the rack, or a structure that lifts or presses the cutter head up by an arc-shaped spring.

4. The stapler cutter with a safety function according to claim 1, characterized in that: The blade consists of two outer blades and two inner blades. The front ends of the outer and inner blades are respectively provided with outer blade retaining connectors and inner blade retaining connectors, with the outer blade retaining connectors being slightly larger than the inner blade retaining connectors. The rear end of the blade head has a retaining groove for engaging the outer and inner blade retaining connectors. A retaining rib is provided in the center of the retaining groove, making the inner diameter of the center of the groove smaller than the inner diameter of the outer side. The inner blade retaining connector engages with the center of the retaining groove at the rear end of the blade head, and the outer blade retaining connector engages with the outer side of the retaining groove at the rear end of the blade head. The upper parts of the outer and inner blade retaining connectors have movable gaps, allowing the blade head to be lifted upwards.

5. The stapler cutter with a safety function according to claim 1, characterized in that: The blade consists of two outer blades and two inner blades. The front ends of the two outer blades are provided with pin holes, and the rear ends of the blade head are provided with pin shafts. The blade head is movably connected to the pin holes at the front ends of the two outer blades through the pin shafts. There is a movable gap between the front ends of the two inner blades and the rear ends of the blade head. One end of the tension spring is connected to the rear ends of the blade head, and the other end is connected to the front ends of the inner blades.

6. The stapler cutter with a safety function according to claim 1, characterized in that: The blade head is equipped with a magnet at the rear; the blade body is composed of two outer blades and two inner blades, and the front end of the blade body and the blade head are connected by a snap-fit ​​connection, allowing the blade head to be lifted upwards along the front end of the blade body; the front end face of the blade shell is equipped with a magnet that can attract the magnet at the rear of the blade head.

7. A stapler cutter equipped with the cutting blade according to any one of claims 1 to 6, comprising a staple cartridge, a blade housing, a cutting blade, and a push rod, wherein a staple pusher slider is provided in the staple cartridge; the rear end of the staple cartridge is connected to the blade housing, the rear end of the cutting blade is connected to the push rod, the cutting blade and the push rod slide within a sliding cavity of the blade housing, and the cutting tip and the staple pusher slider slide within a sliding cavity of the staple cartridge, characterized in that: The cutting blade has a front groove at the front end of the blade head, the blade is inside the front groove, and a protruding structure is provided at the upper end of the front groove; the pusher slider has a recess at the rear end, and the protruding structure on the blade head can be inserted into the recess at the rear end of the pusher slider.

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