One-stage advancement and retraction device and stapler

Abstract

The present invention relates to the field of medical devices, and in particular to a one-stage advancement and retraction device and anastomosis device. The one-stage advancement and retraction device comprises a cylinder body and a driving connection mechanism, wherein the cylinder body comprises a first flow channel on which a firing rod is installed, a second flow channel on which a firing piston is installed, and a third flow channel on which a return piston is installed, and a firing rod piston is provided on the rod portion of the firing rod located in the first flow channel, and the second flow channel and the third flow channel are both connected to the first flow channel, and the driving connection mechanism drives one of the firing rod, the firing piston, and the return piston to move in the area between the second flow channel, the third flow channel, and the connecting port of the first flow channel. The beneficial effects of the present invention are: the firing times are reduced through a simple structural design, the operation is simpler and more convenient, and the firing and return systems are shared, the structure is simplified, and the operation is stable and smooth.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a one-stage advancement and retraction device and anastomosis device. Background Art

[0002] The stapler is mainly composed of two parts: the gun body and the assembly. The existing stapler structural principles are basically the same, in which the gun body mainly includes: barrel assembly, firing mechanism, drive mechanism, safety mechanism, return mechanism, movable handle, gun body shell, etc. The drive mechanism is mainly realized through gear, rack or ratchet, pawl mechanism transmission, and the main problems are as follows: the stapler structure is relatively complex, the assembly process is more, which reduces the reliability of the stapler; the cutting process is cumbersome, and it takes three to four times to complete a cut. In particular, the laparoscopic linear cutting stapler is mainly used for minimally invasive surgery, and multiple firings are likely to affect the surgical effect. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a one-stage advancement and retraction device and anastomosis device, which are used to solve the problems of the prior art such as complex structure and multiple firings required during the cutting process.

[0004] To achieve the above-mentioned objectives and other related objectives, the present invention provides a one-stage advancement and retraction device, including a cylinder body and a driving connection mechanism, the cylinder body including a first flow channel on which a firing rod is installed, a second flow channel on which a firing piston is installed, and a third flow channel on which a return piston is installed, the firing rod is located in the first flow channel and a firing rod piston is provided on the rod portion, the second flow channel and the third flow channel are both connected to the first flow channel, and the driving connection mechanism drives one of the firing rod, the firing piston and the return piston to move in the area between the connecting openings of the second flow channel, the third flow channel and the first flow channel.

[0005] The beneficial effects of the present invention are: reducing the number of firing times through a simple structural design, making the operation simpler and more convenient, and sharing the firing and return systems, which simplifies the structure and ensures stable and smooth operation.

[0006] Optionally, the driving connection mechanism includes a driving connecting rod and a shift block, the driving connecting rod is provided with a first channel for a firing rod to pass through, a second channel for a piston rod for a firing piston to pass through, and a third channel for a piston rod for a return piston to pass through, the driving connecting rod is also provided with a first sliding groove, the shift block is installed in the first sliding groove, and slides along the first sliding groove to switch the opening and closing states of the first channel, the second channel and the third channel.

[0007] Optionally, a shift block handle is installed outside the driving connection mechanism, and the shift block handle extends into the first sliding groove to be connected with the shift block, and drives the shift block to slide along the first sliding groove.

[0008] Optionally, the driving connecting rod is provided with positioning parts corresponding to the first channel, the second channel and the third channel respectively.

[0009] Optionally, it further comprises a reset mechanism for driving the driving connection mechanism to reset, and two ends of the reset mechanism are respectively connected to the cylinder body and the driving connection mechanism.

[0010] Optionally, the cylinder body is provided with a first end cover for sealing both ends of the first flow channel and a second end cover for sealing the second flow channel end and the third flow channel end, and both ends of the reset mechanism are respectively connected to the second end cover and the drive connection mechanism.

[0011] Optionally, the effective areas of the firing piston and the return piston are both larger than the effective area of ​​the firing rod piston.

[0012] Optionally, the connecting ports of the second flow channel, the third flow channel and the first flow channel are located at both ends of the first flow channel. In the initial state, the firing rod piston is located at one end of the first flow channel close to the connecting port of the second flow channel, the firing piston is located at one end of the second flow channel away from the connecting port of the second flow channel, and the return piston is located at one end of the first flow channel close to the connecting port of the first flow channel.

[0013] The beneficial effects of adopting the above optional solution are: compact and reasonable layout, simplified structure, and reduced firing times.

[0014] A stapler comprises a movable handle, a gun body shell, a rotating assembly, a barrel assembly, and a staple magazine assembly, and also comprises a one-stage advancement and retraction device as described above, wherein the one-stage advancement and retraction device is mounted on the gun body shell, and the movable handle is connected to a driving connection mechanism, and drives the driving connection mechanism to drive a firing rod to move so that a cutting knife assembly in the staple magazine assembly operates.

[0015] Optionally, the movable handle is hinged to the gun body shell, a second slide groove is provided on the movable handle, the drive connection mechanism is hinged to the second slide groove, and the movable handle rotates around the hinge with the gun body shell to drive the drive connection mechanism to move linearly.

[0016] The beneficial effects of the present invention are as follows: a common flow channel is provided for the firing and returning of the stapler, the layout is compact, and the structure is simplified; through reasonable structural design, the stapler can be fired once during the cutting process, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It shows the assembly schematic diagram of the one-stage advancing and retracting device of the present invention;

[0018] Figure 2 It shows a cross-sectional view of a one-stage advancing and retracting device of the present invention;

[0019] Figure 3 It is a schematic diagram showing the structure of the driving connection mechanism of the one-stage advancing and retracting device of the present invention;

[0020] Figure 4 It shows a side view of the driving connection mechanism of the one-stage advancing and retracting device of the present invention;

[0021] Figure 5 It is a cross-sectional view showing the driving connection mechanism of the one-stage advancing and retracting device of the present invention;

[0022] Figure 6 It shows the working principle diagram of the one-stage advancing and retracting device of the present invention;

[0023] Figure 7 Shown is a schematic structural diagram of the stapler of the present invention;

[0024] Figure 8 Shown is a schematic structural diagram of the movable handle of the stapler of the present invention.

[0025] Part Number Description

[0026] 1 One-stage advancing and retracting device;

[0027] 11 Cylinder block;

[0028] 111 first flow channel;

[0029] 112 second flow channel;

[0030] 113 Third flow channel;

[0031] 12 firing rod;

[0032] 121 firing rod piston;

[0033] 13 Firing piston;

[0034] 14 return piston;

[0035] 15. Reset mechanism;

[0036] 16 driving connection mechanism;

[0037] 161 driving connecting rod;

[0038] 162 1st channel;

[0039] 163 Second Channel;

[0040] 164 3rd aisle;

[0041] 165 Dial Block;

[0042] 166 Dial block handle;

[0043] 167 First Chute;

[0044] 17 first end cap;

[0045] 18 second end cap;

[0046] 2 movable handles;

[0047] 21 second chute;

[0048] 3 Gun body shell;

[0049] 4 Rotating assembly;

[0050] 5. Barrel assembly;

[0051] 6 nail magazine assembly;

[0052] 61 cutting knife assembly;

[0053] 62 Nail cartridge assembly. DETAILED DESCRIPTION

[0054] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0055] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as within the scope of implementation of the present invention without substantially changing the technical content.

[0056] Before describing the embodiments of the present invention in detail, the application environment of the present invention is described first. The technology of the present invention is mainly applied to medical device staplers, especially to laparoscopic linear cutting staplers. The present invention solves the problems that traditional staplers need to be fired multiple times during cutting, have complex structures, are inconvenient to operate, and affect the quality of surgery.

[0057] like Figures 1 to 6As shown, the one-stage advancing and retracting device of the present invention comprises a cylinder body 11, a reset mechanism 15 and a driving connection mechanism 16. The cylinder body 11 comprises a first flow channel 111 on which a firing rod 12 is installed, a second flow channel 112 on which a firing piston 13 is installed and a third flow channel 113 on which a return piston 14 is installed. A firing rod piston 121 is provided on the rod portion of the firing rod 12 located in the first flow channel 111, and the firing rod piston 121 moves together with the firing rod 12. The second flow channel 112 and the third flow channel 113 are both connected to the first flow channel 111, and the driving connection mechanism 16 drives one of the firing rod 12, the firing piston 13 and the return piston 14 to move in the area between the second flow channel 112, the third flow channel 113 and the connecting opening of the first flow channel 111. After the driving connection mechanism 16 is operated, it is reset by the reset mechanism 15 to prepare for the next operation. The two ends of the reset mechanism 15 are respectively connected to the cylinder body 11 and the driving connection mechanism 16. The reset mechanism 15 can be a spring. The driving connection mechanism 16 is forced to run and compress the spring. When the force disappears, the driving connection mechanism is reset under the action of the spring. Among them, the cylinder body 11 is equipped with a first end cover 17 for sealing the two ends of the first flow channel 111 and a second end cover 18 for sealing the end of the second flow channel 112 and the end of the third flow channel 113. The two ends of the reset mechanism 15 are respectively connected to the second end cover 18 and the driving connection mechanism 16. The number of reset mechanisms 15 can be set according to demand. In the present invention, the two second end covers 18 are connected with the reset mechanism 15, and the structure is symmetrical, which is conducive to the stable reset of the driving connection mechanism 16. The cylinder body 11 can be a hydraulic cylinder or a gas cylinder. When the cylinder body is a hydraulic cylinder, the first flow channel 111, the second flow channel 112, and the third flow channel 113 are filled with liquid to push each piston to move in the specified area.

[0058] like Figures 1 to 6As shown, the driving connection mechanism 16 includes a driving connecting rod 161 and a shifting block 165. The driving connecting rod 161 is provided with a first channel 162 for the firing rod 12 to pass through, a second channel 163 for the piston rod of the firing piston 13 to pass through, and a third channel 164 for the piston rod of the return piston 14 to pass through. The driving connecting rod 161 is also provided with a first slide groove 167. The shifting block 165 is installed in the first slide groove 167 and slides along the first slide groove 167 to switch the opening and closing states of the first channel 162, the second channel 163 and the third channel 164. Through a driving connection mechanism, any component of the firing rod 12, the firing piston 13 and the return piston 14 can be driven to operate. A shifting block handle 166 is installed on the outside of the driving connection mechanism 16. The shifting block handle 166 extends into the first slide groove 167 and is connected to the shifting block 165. The shifting block 165 is driven by the shifting block handle 166 to slide along the first slide groove 167 to switch positions. The driving connecting rod 161 is provided with positioning parts corresponding to the first channel 162, the second channel 163, and the third channel 164, wherein the contours of the first channel 162, the second channel 163, and the third channel 164 on the outer side of the driving connecting rod 161 have an arc structure, and the positioning parts of the arc structure are used to assist in judging whether the shift block 165 has moved to the specified position. When the shift block handle 166 moves upward to support the top of the third channel 164, the shift block handle 166 reaches the upward limit, and the third channel 164 is closed; when the shift block handle 166 moves downward to support the bottom of the second channel 163, the shift block handle 166 reaches the downward limit, and the second channel 163 is closed; when the shift block handle 166 moves to the arc structure positioning part of the first channel 162, the first channel 162 is closed. The driving connecting rod can accurately reflect the opening and closing states of the first channel 162, the second channel 163, and the third channel 164 through a simple structure.

[0059] like Figure 1 , Figure 2 and Figure 6As shown, the connecting ports of the second flow channel 112, the third flow channel 113 and the first flow channel 111 are located at both ends of the first flow channel 111. In the initial state, the firing rod piston 121 is located at one end of the first flow channel 111 close to the connecting port of the second flow channel 112, that is, the firing rod piston 121 is in the position of the maximum retract stroke, the firing piston 13 is located at one end of the second flow channel 112 away from the connecting port of the second flow channel 112, that is, the firing piston 13 is in the position of the maximum retract stroke, and the return piston 14 is located at one end of the first flow channel 111 close to the connecting port of the first flow channel 111, that is, the return piston 14 is in the position of the maximum forward stroke. Among them, the second channel 112 includes a firing piston chamber and a small diameter section for the firing piston 13 to move, and the aperture of the firing piston chamber is larger than the aperture of the small diameter section connecting the second channel 112 and the first channel 111; the third channel 113 includes a return piston chamber and a small diameter section for the return piston 14 to move, and the aperture of the return piston chamber is larger than the aperture of the small diameter section connecting the third channel 113 and the first channel 111. The apertures of the small diameter section of the second channel 112 and the small diameter section of the third channel 113 can be equal to the aperture of the first channel 111, so that the firing piston 13 and the return piston 14 can move a smaller distance to enable the firing rod piston 121 to move a larger distance. The effective areas of the firing piston 13 and the return piston 14 are both larger than the effective area of ​​the firing rod piston 121, and the effective area of ​​the firing piston 13 and the effective area of ​​the return piston 14 are equal, both being S 2 The effective area of ​​the firing rod piston 121 is S 1 , that is, S 2 =n S 1 , where n is greater than 1. According to the working principle of the hydraulic cylinder, the effective area of ​​the small piston firing rod piston 121 is S 1 , the displacement is L 1 The effective areas of the large piston firing piston 13 and the return piston 14 are both S 2 , the displacement is L 2 , if the volume change of the liquid during compression is ignored, according to the formula S 1 L 1 =S 2 L 2 It can be seen that if S 2 YesS 1 n times, then L 1 YesL 2 The large piston can push the small piston to move a larger distance by moving a smaller distance, so that the cutting process can be completed in one shot, reducing the number of shots.

[0060] like Figures 1 to 5 , Figure 7 and Figure 8As shown, the stapler of the present invention comprises a movable handle 2, a gun body shell 3, a rotating assembly 4, a barrel assembly 5, a nail magazine assembly 6 and the aforementioned one-stage advancing and retracting device 1, the nail magazine assembly 6 comprises a cutting knife assembly 61 and a nail magazine assembly 62, the one-stage advancing and retracting device 1 is mounted on the gun body shell 3, the movable handle 2 is connected to the driving connection mechanism 16, and drives the driving connection mechanism 16 to drive the firing rod 12 to move so that the cutting knife assembly 61 operates. The movable handle 2 is hinged to the gun body shell 3, and a second slide groove 21 is provided on the movable handle 2. The driving connecting rod 161 of the driving connection mechanism 16 is hinged to the second slide groove 21 through a connecting member, and the movable handle 2 rotates around the hinged portion with the gun body shell 3 to drive the driving connection mechanism 16 to move linearly, thereby realizing the operation of the nail magazine assembly 62 and the cutting assembly 61.

[0061] The working process is as follows: when the stapler performs a cutting operation, the shift block 165 is first moved to the position of the first channel 162 along the first slide groove 167 by the shift block handle 166 to achieve the purpose of blocking the first channel 162, and the movable handle 2 is rotated, and the movable handle 2 drives the driving connecting rod 161 to move. The driving connecting rod 161 drives the firing rod 12 to move under the blocking action of the shift block 165, and the firing rod 12 drives the cutting knife assembly 61 in the staple magazine assembly 6 to move, so that the staple magazine assembly 62 closes. At this time, the force on the movable handle 2 is removed, and the movable handle 2 is closed under the action of the reset mechanism 15. Now reset; then move the shift block 165 to the position of hitting the second channel 163 to achieve the purpose of blocking the second channel 163, rotate the movable handle 2, the movable handle 2 drives the driving connecting rod 161 to move, the driving connecting rod 161 drives the firing piston 13 to move under the blocking action of the shift block 165, and the firing rod piston 121 is pushed to move through the transmission action of the hydraulic system. The firing rod piston 121 drives the firing rod 12 to drive the cutting knife assembly 61 in the nail magazine assembly 6 to move to achieve the cutting purpose. At this time, the force on the movable handle 2 is removed, and the movable handle 2 is reset under the action of the reset mechanism 15. When the stapler cutting assembly performs a retracting action, during the stapler cutting process, the return piston 14 moves from the position of the maximum forward stroke to the position of the maximum backward stroke, and moves the shift block 165 to the position of the third channel 164 to achieve the purpose of blocking the third channel 164, and rotates the movable handle 2. The movable handle 2 drives the driving connecting rod 161 to move. The driving connecting rod 161 drives the return piston 14 to move under the blocking action of the shift block 165, and the firing rod piston 121 is pushed to move through the transmission action of the hydraulic system. The firing rod piston 121 drives the firing rod 12 to drive the cutting knife assembly 61 in the nail magazine assembly 6 to move to achieve the return purpose. At this time, the force on the movable handle 2 is removed, and the movable handle 2 is reset under the action of the reset mechanism 15.

[0062] The present invention uses a simple structural design so that the stapler only needs to be fired once during cutting, which simplifies the operating steps and improves the quality of the surgery. The firing and returning operations share a set of drive connection mechanisms, which simplifies the structure, makes assembly simple and convenient, reduces the failure rate, improves reliability, and has a reasonable and compact layout, reducing the space occupied by the structure.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A one-stage advancing and retreating device, characterized in that: The invention comprises a cylinder body, a driving connection mechanism and a reset mechanism for driving the driving connection mechanism to reset, the two ends of the reset mechanism are respectively connected to the cylinder body and the driving connection mechanism, the cylinder body comprises a first flow channel on which a firing rod is installed, a second flow channel on which a firing piston is installed and a third flow channel on which a return piston is installed, the firing rod piston is provided on the rod portion of the firing rod located in the first flow channel, the effective areas of the firing piston and the return piston are both larger than the effective area of ​​the firing rod piston, the second flow channel and the third flow channel are both connected to the first flow channel, and the driving connection mechanism drives one of the firing rod, the firing piston and the return piston to move in the area between the second flow channel, the third flow channel and the connecting opening of the first flow channel, the connecting opening of the second flow channel, the third flow channel and the first flow channel are located at the two ends of the first flow channel, in the initial state, the firing rod piston is located at one end of the first flow channel close to the connecting opening of the second flow channel, the firing piston is located at one end of the second flow channel away from the connecting opening of the second flow channel, and the return piston is located at one end of the first flow channel close to the connecting opening of the first flow channel; The driving connection mechanism includes a driving connecting rod and a shift block. The driving connecting rod is provided with a first channel for a firing rod to pass through, a second channel for a piston rod for a firing piston to pass through, and a third channel for a piston rod for a return piston to pass through. The driving connecting rod is also provided with a first sliding groove. The shift block is installed in the first sliding groove and slides along the first sliding groove to switch the opening and closing states of the first channel, the second channel and the third channel.

2. The one-stage advancing and retreating device according to claim 1, characterized in that: A shift block handle is installed outside the driving connection mechanism, and the shift block handle extends into the first sliding groove to be connected with the shift block, and drives the shift block to slide along the first sliding groove.

3. The one-stage advancing and retreating device according to claim 1, characterized in that: The driving connecting rod is provided with positioning parts corresponding to the first channel, the second channel and the third channel respectively.

4. The one-stage advancing and retreating device according to claim 1 is characterized in that: The cylinder body is provided with a first end cover for sealing both ends of the first flow channel and a second end cover for sealing the second flow channel end and the third flow channel end. Both ends of the reset mechanism are respectively connected to the second end cover and the drive connection mechanism.

5. A stapler, comprising a movable handle, a gun body shell, a rotating assembly, a barrel assembly, and a stapler magazine assembly, characterized in that: It also includes a one-stage advancement and retraction device as described in any one of claims 1 to 4, wherein the one-stage advancement and retraction device is installed on the gun body shell, and the movable handle is connected to the drive connection mechanism, and drives the drive connection mechanism to drive the firing rod to move so that the cutting knife assembly in the nail magazine assembly operates.

6. The stapler according to claim 5, characterized in that: The movable handle is hinged to the gun body shell, a second slide groove is arranged on the movable handle, the drive connection mechanism is hinged to the second slide groove, and the movable handle rotates around the hinge point with the gun body shell to drive the drive connection mechanism to move linearly.

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