A linear cutting stapler with automatic stroke compensation

Abstract

The present invention discloses a linear cutting anastomosis device with automatic stroke compensation, comprising a body shell, a linear drive motor disposed in the body shell, a micro switch fixed in the body shell, the linear drive motor connected to the rear end of a short pusher rod located in the body shell, a micro switch trigger block provided on the short pusher rod, a front end of the short pusher rod connected to the rear end of a long pusher rod disposed in the pusher rod shell, a front end of the long pusher rod connected to the rear end of a pusher positioning sleeve located in a cutter head shell, a pusher blade provided at the front end of the pusher positioning sleeve, a slide bar provided on the side of the pusher positioning sleeve, a limit locking block fixed to the inner wall of the cutter head shell, a slide groove adapted to the slide bar provided on the limit locking block, the slide bar embedded in the slide groove and capable of moving back and forth along the slide groove. The present invention has a universal stroke, avoids the risk of misoperation caused by swiping a card or manually selecting the motor stroke, prevents medical accidents that may be caused by misselecting the stroke, and improves the safety of surgery.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a linear cutting stapler with automatic stroke compensation. Background Art

[0002] A linear cutting stapler is a medical device used for segmenting, resecting, and / or establishing anastomosis of gastrointestinal or lung tissue during open or laparoscopic surgery. In practice, different stapler lengths are required depending on the application environment, and different stapler lengths require different blade assembly lengths. Existing linear cutting staplers typically require a card or button to identify the blade assembly model and select different motor strokes. This increases complexity, makes it prone to errors, and increases the cost of the electric stapler. Summary of the Invention

[0003] The present invention aims to address the above-mentioned problems existing in the prior art and provide a linear cutting stapler with automatic stroke compensation. The above-mentioned object of the present invention is achieved by the following technical means:

[0004] A linear cutting stapler with automatic stroke compensation comprises a body shell, a linear drive motor is arranged in the body shell, a micro switch is fixed in the body shell, the linear drive motor is connected to the rear end of a short push knife rod located in the body shell, a micro switch trigger block is provided on the short push knife rod, the front end of the short push knife rod is connected to the rear end of a long push knife rod arranged in the push rod shell, the front end of the long push knife rod is connected to the rear end of a push knife positioning sleeve located in the blade head shell, the front end of the push knife positioning sleeve is provided with a push blade, the side of the push knife positioning sleeve is provided with a slide bar, a limit locking block is fixed to the inner wall of the blade head shell, the limit locking block is provided with a slide groove adapted to the slide bar, the slide bar is embedded in the slide groove and can move back and forth along the slide groove;

[0005] A spring clamp is provided on the outer wall of the front end of the long pusher rod, the spring clamp is connected to the compression spring provided inside the long pusher rod, and the spring clamp is clamped in the clamping groove provided at the rear end of the pusher positioning sleeve;

[0006] The limit locking block is provided with a protrusion, and the tail end of the slide is provided with a blocking portion. When the push knife positioning sleeve moves backward and is blocked by the blocking portion provided at the tail end of the slide, the protrusion squeezes the spring clamp head, so that the long push knife rod is disconnected from the push knife positioning sleeve.

[0007] There are two micro switch trigger blocks, which are respectively arranged at the front end and the rear end of the short pusher rod, and the micro switch is arranged between the two micro switch trigger blocks;

[0008] The push blade includes a push blade rod and a blade head arranged at the front end of the push blade rod. The front end surface of the blade head shell is provided with a push blade blade head placement groove. The push blade rod is located in the blade head shell and the front end passes through the push blade blade head placement groove and is connected to the blade head. The push blade blade head placement groove blocks the blade head from entering the blade head shell.

[0009] A limit locking block positioning groove is provided in the cutter head housing, the limit locking block is clamped in the limit locking block positioning groove, and the distance from the limit locking block positioning groove to the push blade head placement groove is adapted to the length of the push blade;

[0010] The material of the limit locking block is polyurethane;

[0011] There are two spring clamps and they are symmetrically arranged relative to the central axis of the long pusher rod, and there are two corresponding limit locking blocks;

[0012] When the long knife pusher rod is at the starting position and is disconnected from the knife pusher positioning sleeve, an idle travel interval is provided between the front end of the long knife pusher rod and the rear end of the knife pusher positioning sleeve.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention uses a micro switch and a micro development trigger block to automatically control the stroke length of the linear drive motor. An idle stroke interval is set between the long push blade rod and the push blade positioning sleeve, which can adapt to push blades of different lengths. This avoids the risk of misoperation caused by the need to swipe a card or manually select the motor stroke of the linear drive motor corresponding to push blades of different lengths in the prior art, thereby effectively reducing medical accidents that may be caused by misselection of the stroke and improving the safety of surgery. It shortens operation time, improves work efficiency, and reduces human intervention. It eliminates the complicated card swiping recognition process and chip program setting, is simple to operate, and saves costs.

[0015] 2. The limit locking block is made of polyurethane (PU) material, and its buffering effect can reduce the vibration of the forceps head and reduce the tearing and bleeding of the clamped tissue.

[0016] 3. A plurality of limit locking block positioning grooves are provided on the cutter head housing. The limit locking blocks are clamped in different limit locking block positioning grooves to meet different push blade lengths, thereby reducing costs and improving versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is an exploded view of the overall structure of the present invention;

[0019] Figure 3It is a structural diagram of the push knife positioning sleeve and the limit locking block;

[0020] Figure 4 It is a structural diagram of the front end of the long pusher rod;

[0021] Figure 5 It is a structural diagram of the push knife positioning sleeve and the long push knife rod;

[0022] Figure 6 It is a structural diagram of the long pusher rod and the limit locking block;

[0023] Figure 7 It is a structural diagram of a micro switch and a micro switch trigger block;

[0024] Figure 8 This is a structural diagram of the length of the staple cartridge clamp head assembly and the length of the push blade when the length of the staple cartridge clamp head assembly and the length of the push blade are longer;

[0025] Figure 9 A schematic diagram of the structure of the staple cartridge clamp head assembly length and the push blade length when the staple cartridge clamp head assembly length and the push blade length are shorter;

[0026] Figure 10 This is a structural diagram of the push blade head placement slot and the limit locking block positioning slot.

[0027] In the figure: 1-cutter head assembly, 101-cutter head housing, 2-push rod assembly, 201-push rod housing, 3-body, 301-body housing, 4-push blade, 401-cutter head, 402-push blade rod, 5-push blade positioning sleeve, 501-slot, 502-slide, 6-limit locking block, 601-protrusion, 602-slide, 7-long push blade rod, 8-short push blade rod, 9-drive control assembly, 10-nail magazine clamp head assembly, 11-micro switch, 12-micro switch trigger block, 13-spring clamp, 14-idle travel range, 15-limit locking block positioning groove, 16-push blade head placement groove. DETAILED DESCRIPTION

[0028] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below with reference to the embodiments. The embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0029] Example 1:

[0030] like Figure 1-7 A linear cutting stapler with automatic stroke compensation includes a body 3, a push rod assembly 2, a cutter head assembly 1 and a staple cartridge clamp head assembly 10.

[0031] The fuselage 3 includes a fuselage shell 301 and a drive control component 9 arranged inside the fuselage shell 301. The drive control component 9 includes a linear drive motor and a micro switch 11. The linear drive motor is connected to the rear end of the short pusher rod 8. The short pusher rod 8 is located in the fuselage shell 301. A micro switch trigger block 12 is provided on the short pusher rod 8. When the linear drive motor drives the short pusher rod 8 to move, so that the micro switch trigger block 12 hits the micro switch 11, the linear drive motor stops working, the short pusher rod 8 stops moving, and the micro switch 11 is fixed in the fuselage shell 301.

[0032] In some embodiments, there are two micro switch trigger blocks 12, which are respectively arranged at the front end and the rear end of the short push blade rod 8. The distance between the micro switch trigger blocks 12 is the stroke of the linear drive motor. The micro switch 11 is fixed in the body shell 301 and is located between the two micro switch trigger blocks 12. The micro switch 11 and the micro switch trigger block 12 are used to automatically control the stroke length of the linear drive motor. An idle stroke interval 14 is set between the long push blade rod 7 and the push blade positioning sleeve 5, which can adapt to push blades 4 of different lengths. This avoids the risk of misoperation caused by the need to swipe a card or manually select the motor stroke of the linear drive motor corresponding to push blades of different lengths in the prior art, thereby effectively reducing medical accidents that may be caused by misselection of the stroke and improving the safety of the operation. The operation time is shortened, the work efficiency is improved, and human intervention is reduced. The complicated card swiping recognition process and chip program setting are eliminated, the operation is simple, and the cost is saved.

[0033] The push rod assembly 2 includes a push rod housing 201 and a long push rod 7 arranged in the push rod housing 201. The rear end of the long push rod 7 is threadedly connected to the front end of the short push rod 8. A spring clamp 13 is provided on the outer wall of the front end of the long push rod 7. The spring clamp 13 is connected to the compression spring arranged inside the long push rod 7; when the spring clamp 13 is not squeezed by external force, under the action of the elastic force of the compression spring, the clamp head of the spring clamp 13 protrudes from the outer wall of the push rod 7. When the spring clamp 13 is squeezed by external force, it moves relative to the central axis direction of the long push rod 7 and is completely retracted inside the long push rod 7.

[0034] In some embodiments, there are two spring clamps 13 and they are symmetrically arranged relative to the central axis of the long push rod 7.

[0035] The cutter head assembly 1 includes a cutter head shell 101, a limit locking block 6, a push knife positioning sleeve 5 and a push blade 4. The push knife positioning sleeve 5 is located in the cutter head shell 101, and a card slot 501 is provided at the rear end of the push knife positioning sleeve 5. The spring card head 13 provided on the outer wall of the front end of the long push knife rod 7 can be elastically inserted into the card slot 501. The front end of the push knife positioning sleeve 5 is provided with a push blade 4. The push blade 4 includes a push knife rod portion 402 and a cutter head 401 provided at the front end of the push knife rod portion. A slide bar 502 is provided on the side of the push knife positioning sleeve 5. The limit locking block 6 is fixed to the inner wall of the cutter head shell 101, and a slide groove 602 adapted to the slide bar 502 is provided on the limit locking block 6. The slide bar 502 is embedded in the slide groove 602 and can move back and forth along the slide groove 602. The tail end of the slide groove 602 is provided with a blocking portion, and a protrusion 601 is provided on the limit locking block 6.

[0036] The nail magazine forceps head assembly 10 is assembled to the blade housing 101 of the blade assembly 1 through a connecting head. The blade head 401 of the push blade 4 is driven into the nail magazine forceps head assembly 10 for cutting. The opening and closing drive structure of the nail magazine forceps head assembly 10 belongs to the existing technology and is not described in detail in the present invention.

[0037] During surgery, the staple cartridge clamp assembly 10 is first closed, and then the linear drive motor is started to control the short push knife rod 8 to move forward. When the linear drive motor drives the short push knife rod 8 to move forward, it further pushes the long push knife rod 7 forward. When the spring clamp 13 set at the front end of the long push knife rod 7 contacts the inner wall of the rear end of the push knife positioning sleeve 5, under the cooperation of the slide groove 602 and the slide bar 502, the push knife positioning sleeve 5 is pushed forward relative to the limit locking block 6. At this time, the protrusion 601 on the limit locking block 6 is not located outside the slot 501 at the rear end of the push knife positioning sleeve 5. The spring clamp 13 is squeezed by the inner wall of the push knife positioning sleeve 5 and shrinks into the inside of the long push knife rod 7; when the spring clamp 13 moves to the position of the slot 501 set at the rear end of the push knife positioning sleeve 5, the spring clamp 13 moves away from the central axis of the long push knife rod 7 under the action of the spring. The spring clamp 13 is stuck in the slot 501. Since the protrusion 601 on the limit locking block 6 is not located outside the slot 501 at the rear end of the push knife positioning sleeve 5, the protrusion 601 will not push the spring clamp 13 back into the push knife positioning sleeve 5, so that the long push knife rod 7 is fixedly connected to the push knife positioning sleeve 5. The long push knife rod 7 drives the push knife positioning sleeve 5 and the push blade 4 to move forward. When the blade head 401 of the push blade 4 enters the nail magazine clamp assembly 10, cutting begins. Subsequently, the nail magazine clamp assembly 10 is closed for suturing. When the blade head 401 of the push blade 4 runs to the front end of the nail magazine clamp assembly 10, the micro switch trigger block 12 arranged at the rear end of the short push knife rod 8 contacts the micro switch 11, the linear drive motor stops working, and the knife-out process ends.

[0038] When the cutting and suturing process is finished, the switch is turned on, the linear drive motor drives the short push knife rod 8 to move backward, and the long push knife rod 7 drives the push knife positioning sleeve 5 and the push blade 4 to move backward. Under the cooperation of the slide groove 602 and the slide bar 502, the push knife positioning sleeve 5 moves backward relative to the limit locking block 6. Since the rear end of the slide groove 602 is provided with a blocking portion, when the slide bar 502 moves along the slide groove 602 to the blocking portion, it prevents the push knife positioning sleeve 5 from moving further backward relative to the limit locking block 6. At the same time, the limit locking block 6 The protrusion 601 is located on the outside of the slot 501 of the push knife positioning sleeve 5. The spring clamp 13 is squeezed by the protrusion 601 on the limit locking block 6 and shrinks to the inside of the long push knife rod 7. The long push knife rod 7 is disconnected from the push knife positioning sleeve 5. As the long push knife rod 7 continues to move backward, the long push knife rod 7 is disengaged from the push knife positioning sleeve 5. When the microswitch trigger block 12 set at the front end of the short push knife rod 8 contacts the microswitch 11, the linear drive motor stops working, the long push knife rod 7 is in a reset state, and the retraction process ends.

[0039] In some embodiments, there are two limit locking blocks 6 .

[0040] In some embodiments, the material of the limit locking block 6 is polyurethane (PU). The polyurethane material has a buffering effect and can reduce the shaking of the forceps head and reduce the tearing and bleeding of the clamped tissue.

[0041] For different lengths of the staple cartridge forceps assembly 10, the required length of the push blade 4 is also different. When the staple cartridge in the staple cartridge forceps assembly 10 is shorter, the length of the push blade 4 is correspondingly shorter.

[0042] like Figure 10 The length of the cutter head assembly 1 is fixed, and the front end surface of the cutter head shell of the cutter head assembly 1 is provided with a push blade cutter head placement groove 16. The push blade 4 includes a push blade rod portion 402 and a cutter head 401 arranged at the front end of the push blade rod portion. The push blade rod portion 402 is located in the cutter head shell 101 and the front end passes through the push blade cutter head placement groove 16 and is connected to the cutter head 401. The cutter head 401 cannot pass through the push blade cutter head placement groove 16 and enter the cutter head shell 101. The push blade 4 can be driven back by the long push blade rod 7 until the cutter head 401 is stuck in the push blade cutter head placement groove 16. According to the different lengths of the push blade 4, a limited locking block positioning groove 15 is provided at the corresponding position of the cutter head shell 101 of the cutter head assembly 1. The distance from each limited locking block positioning groove 15 to the push blade cutter head placement groove 16 is adapted to the length of the push blade 4. The position-limiting locking block 6 is clamped in different position-limiting locking block positioning grooves 15 to meet the needs of different push blade 4 lengths, thereby reducing costs and improving versatility of use.

[0043] As a preferred embodiment, a limit locking block 6 is provided in the limit locking block positioning groove 15 . When the push blade 4 needs to be replaced, the position of the limit locking block 6 is adjusted according to the length of the push blade 4 .

[0044] like Figure 8 and Figure 9 If the length of the nail magazine forceps head assembly 10 is longer, the length of the push blade 4 in the cutter head assembly 1 is also longer; if the length of the nail magazine forceps head assembly 10 is shorter, the length of the push blade 4 in the cutter head assembly 1 is also shorter.

[0045] In order to adapt to the different lengths of the push blade 4, an idle stroke interval 14 is designed between the front end of the long push blade rod 7 and the rear end of the push blade positioning sleeve 5. The idle stroke interval 14 is the distance from the front end of the long push blade rod 7 to the rear end of the push blade positioning sleeve 5 when the long push blade rod 7 is in the starting position (not pushed forward) and the blade head 401 at the front end of the push blade 4 is located in the position of the push blade head placement groove 16. By changing the length of the idle stroke interval 14, the automatic stroke compensation function is realized, so that the push blade distance can be automatically adapted according to the different blade head components 1, thereby ensuring that the push blade 4 can be accurately in place during the push blade process to meet different surgical needs.

[0046] The length of the cutter head housing 101 of the cutter head assembly 1 is fixed. When the length of the push blade 4 is long, the length of the idle stroke interval 14 is short. When the length of the push blade 4 is short, the length of the idle stroke interval 14 is long.

[0047] It should be noted that the embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A linear cutting stapler with automatic stroke compensation, comprising a body shell (301), characterized in that: A linear drive motor is provided in the body shell (301), a micro switch (11) is fixed in the body shell (301), the linear drive motor is connected to the rear end of a short pusher rod (8) located in the body shell (301), a micro switch trigger block (12) is provided on the short pusher rod (8), the front end of the short pusher rod (8) is connected to the rear end of a long pusher rod (7) provided in the pusher rod shell (201), the front end of the long pusher rod (7) is connected to the rear end of a pusher positioning sleeve (5) located in the cutter head shell (101), and the pusher positioning sleeve (5) is connected to the rear end of the pusher positioning sleeve (5). ) is provided with a push blade (4) at the front end, a slide bar (502) is provided on the side of the push blade positioning sleeve (5), a limit locking block (6) is fixed to the inner wall of the cutter head shell (101), a slide groove (602) adapted to the slide bar (502) is provided on the limit locking block (6), and the slide bar (502) is embedded in the slide groove (602) and can move forward and backward along the slide groove (602); a spring clamp (13) is provided on the outer wall of the front end of the long push blade rod (7), and the spring clamp (13) and the compression spring provided inside the long push blade rod (7) are connected. The spring clamp (13) is clamped in a clamping groove (501) provided at the rear end of the push blade positioning sleeve (5); the push blade (4) includes a push blade rod (402) and a blade head (401) provided at the front end of the push blade rod, and a push blade head placement groove (16) is provided on the front end surface of the blade head housing (101). The push blade rod (402) is located in the blade head housing (101) and the front end passes through the push blade head placement groove (16) and is connected to the blade head (401). The push blade head placement groove (16) blocks the blade head (401) from entering the push blade head. The blade head housing (101) is provided with a limit locking block positioning groove (15), the limit locking block (6) is clamped in the limit locking block positioning groove (15), and the distance between the limit locking block positioning groove (15) and the push blade head placement groove (16) is adapted to the length of the push blade (4); when the long push blade rod (7) is at the starting position and the long push blade rod (7) is disconnected from the push blade positioning sleeve (5), an empty travel interval (14) is provided between the front end of the long push blade rod (7) and the rear end of the push blade positioning sleeve (5).

2. The linear cutting stapler with automatic stroke compensation according to claim 1, characterized in that: The limit locking block (6) is provided with a protrusion (601), and the tail end of the slide groove (602) is provided with a blocking portion. When the push knife positioning sleeve (5) moves backward and is blocked by the blocking portion provided at the tail end of the slide groove (602), the protrusion (601) squeezes the spring clamp (13), so that the long push knife rod (7) is disconnected from the push knife positioning sleeve (5).

3. The linear cutting stapler with automatic stroke compensation according to claim 1, characterized in that: There are two micro switch trigger blocks (12), which are respectively arranged at the front end and the rear end of the short pusher rod (8), and the micro switch (11) is arranged between the two micro switch trigger blocks (12).

4. The linear cutting stapler with automatic stroke compensation according to claim 1, characterized in that: The material of the limit locking block (6) is polyurethane.

5. The linear cutting stapler with automatic stroke compensation according to claim 1, characterized in that: The number of the spring clamps (13) is two and they are symmetrically arranged relative to the central axis of the long pusher rod (7), and the number of the corresponding limit locking blocks (6) is two.

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