CN110916767B - Gastrointestinal tract perforator - Google Patents

Abstract

Gastrointestinal tract hole puncher relates to medical instrument technical field, and it includes: the puncher comprises a puncher body, a cutter head, a pneumatic motor and an airflow pipeline, wherein the puncher body comprises a shell and a tubular body connected with the shell; the cutter head comprises a sleeve and a cutter head arranged in the sleeve, the rear end of the sleeve is detachably connected with the front end of the tubular body, an end cover of the sleeve is provided with a first suction hole, the cutter head is provided with a second suction hole, and the end surface of the cutter head is hinged with a blade and is provided with a blade driving mechanism; the pneumatic motor is arranged in the shell; the air flow pipeline comprises a first air flow branch, a second air flow branch and a three-way joint; the negative pressure suction force in the first air flow branch is utilized to suck tissues at the part to be punched into the first suction hole and extrude the tissues through the second suction hole, a valve in the second air flow branch is opened, the pneumatic motor operates and drives the cutter head to rotate, and under the action of centrifugal force, the blade driving mechanism drives the blade to rotate around the hinged point and intersect with the second suction hole, so that the tissues extruded from the second suction hole are cut off, and punching is completed.

Description

Gastrointestinal punch

technical field

The invention relates to the technical field of medical devices, in particular to a gastrointestinal tract puncher.

Background technique

Electrosurgery is a commonly used perforating tool in laparoscopic surgery. Electrosurgical perforation will form eschar on the cutting site and cause lateral thermal damage. At the same time, smoke will be generated during electrosurgical cutting, affecting the surgical field. Ultrasonic scalpel drilling has no smoke, small lateral thermal damage and no eschar, and the surgical environment is less polluted and is conducive to postoperative recovery. However, the ultrasonic scalpel equipment is expensive and bulky, and the knife head needs to be adjusted frequently during use. For wiping, the convenience of operation still needs to be improved.

In some open surgeries, punching instruments with purely mechanical structures have more applications. For example, Chinese patent document CN204049774U discloses a heart punching scalpel, although the document claims that the above-mentioned heart punching scalpel can also be used for medical operations on other organs, because when using this device to punch a hole, a cross-shaped hole must be opened at the punching site first. Incision, then pass the cross-shaped positioning head of the locator through the aforementioned incision, and finally rotate the burr knife to make the burr knife move downward to complete the incision. Limited by the size of the abdominal incision during laparoscopic surgery, the above device is used in practice. inconvenient to operate. Another example is the medium and small artery blood vessel puncher disclosed by Chinese patent document CN201200451Y. Its working principle is similar to the above-mentioned heart punching scalpel. When using it, it is necessary to cut a small hole at the punching position first, and then insert the punching head into the hole. , During the process of pressing the handle from the A position to the B position, the power transmission rod is driven by the support rod and the hinge pin, and then the punching head is driven to complete the punching. defect. To sum up, due to the limitation of the operating space, the above two purely mechanical punchers are not suitable for the occasions where punching in the gastrointestinal tract is required in laparoscopic surgery.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a perforator suitable for perforating the gastrointestinal tract in laparoscopic surgery.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a gastrointestinal tract puncher, which comprises:

a puncher body, the puncher body includes a casing and a tubular body, the rear end of the tubular body is fixedly connected to the casing, and the casing is provided with an adapter for externally connecting a negative pressure suction device;

A replaceable cutter head, the cutter head comprises a sleeve with an end cap at the front end and a cutter head arranged in the sleeve, the rear end of the sleeve is detachably connected to the front end of the tubular body, the sleeve A first suction hole is set on the end cover of the cutter head, a second suction hole is set in the axial direction of the cutter head, the first suction hole is communicated with the second suction hole, the cutter head is connected with the first transmission shaft, and the cutter head is connected with the first drive shaft. The blade is hinged on the end surface of the cutter head and a blade reset mechanism and a blade drive mechanism are arranged. When the first transmission shaft drives the cutter head to rotate, the blade drive mechanism moves under the action of centrifugal force, and pushes the blade originally located in the second attraction The blade on the outside of the hole rotates around the hinge point to a position where it intersects with the second suction hole, thereby cutting off the tissue extruded from the second suction hole. After the cutter head stops rotating, the blade reset mechanism drives the blade Reverse around the hinge point and return to the position outside the second suction hole;

an air motor, arranged in the casing, the output shaft of the air motor is connected with a second transmission shaft, the second transmission shaft is penetrated in the tubular body and is detachably connected with the first transmission shaft;

an airflow pipeline, the airflow pipeline includes a first airflow branch, a second airflow branch, and a three-way joint connecting the rear ends of the first airflow branch and the second airflow branch with the adapter, the first airflow branch The front end of the air flow branch is connected to the second suction hole, the air motor is connected to the second air flow branch, and a valve for controlling the air intake of the air motor is arranged in the second air flow branch;

By connecting the adapter to an external negative pressure suction device, the negative pressure suction in the first airflow branch is used to suck the tissue of the part to be punched into the first suction hole and extrude it through the second suction hole. The valve in the second air flow branch is opened, the air motor runs and drives the cutter head to rotate through the first transmission shaft and the second transmission shaft, and finally the blade rotates around the hinge point to the position where it intersects with the second suction hole, and The tissue extruded from the second suction hole is cut off to complete the punching.

As a preferred structure, the blade driving mechanism includes a sliding rail arranged on one side of the hinge point of the blade and a sliding block slidably connected to the sliding rail. When the cutter disc rotates, the sliding block slides along the edge of the sliding block under the action of centrifugal force. The slide rail slides to the outside, the slider pushes against the second half of the blade and drives the blade to rotate around the hinge point in the process of sliding outward, so that the first half of the blade is deflected downward to the position where it intersects with the second suction hole , thereby cutting off the tissue extruded from the second suction hole.

Also as a preferred structure, the blade reset mechanism includes a reset torsion spring, and the reset torsion spring connects the blade and the cutter head.

Wherein, the cutter head is also provided with a blade limiting member, and the blade limiting member is arranged on the other side of the hinge point of the blade. When the cutter head stops rotating, it is affected by the elastic force exerted by the reset torsion spring, The front half of the blade abuts against the blade limiting member.

As another preferred structure, the blade reset mechanism includes a magnet, which is arranged on the other side of the hinge point of the blade. When the cutter head stops rotating, the magnet attracts the front half of the blade and makes it outside the second suction hole.

Preferably, the valve for controlling the air intake of the air motor is a pressure limiting valve, and the negative pressure suction in the first air flow branch draws the tissue at the site to be punched into the first suction hole and passes through the second suction hole After extrusion, with the further operation of the external negative pressure suction device, when the pressure difference between the second airflow branch and the external environment reaches the set limit value of the pressure limiting valve, the pressure limiting valve is opened, and the external air The air flows through the pressure limiting valve to the air motor, and the air motor operates.

Further, the pressure limiting valve is arranged in the casing, and the intake port of the second airflow branch is arranged on the casing.

Preferably, the valve provided in the second airflow branch is an on-off valve, the first airflow branch is also provided with an on-off valve, and the housing is provided with a valve for controlling the opening and closing of the two on-off valves. power switch button.

Preferably, a separator is arranged in the sleeve, the first transmission shaft passes through the center of the separator, and a vent hole is formed on the separator, and the diameter of the vent hole is smaller than the diameter of the second suction hole , the outer peripheral surface of the partition plate is provided with an external thread, and the partition plate and the sleeve are detachably connected through the thread.

Preferably, the cutter head is made of engineering plastics, and a spline connection is used between the first transmission shaft and the second transmission shaft.

The above hole punch adopts replaceable cutter head, and in actual use, cutter heads of different specifications can be selected according to the diameter of the hole to be punched. During the operation, it is only necessary to extend the cutter head and the tubular body connected with the cutter head into the abdominal cavity from the abdominal incision, and then press the front end of the cutter head against the part to be punched, and generate negative pressure through the negative pressure suction device, so that the The tissue in the hole is sucked into the first suction hole and extruded backward from the second suction hole, and then the valve that controls the air intake of the air motor is opened. After the air motor is started, the cutter head rotates. At the intersection of the second suction hole, the tissue extruded from the second suction hole can be excised to complete the punching. The above hole punch will not generate smoke during the punching process like an electric knife, nor will eschar be formed on the cutting site, which is beneficial to the recovery of the punched site after surgery. Compared with the ultrasonic knife, the above-mentioned hole punch has a lower cost, does not need to wipe the knife head frequently, and is more convenient to operate. It is particularly worth mentioning that, compared with the purely mechanical punches in the background art, when the above-mentioned punches are used to punch holes, there is no need to first make a small hole or incision at the incision site, and the cutter head of the above-mentioned punches is Installed at the front end of the slender tubular body, it can be easily inserted into the abdominal cavity during surgery, and the parts that control the perforation (such as negative pressure suction devices, air motors, etc.) are located outside the abdominal cavity, and the operator only needs to operate the above-mentioned external abdominal cavity. The punch can be easily done with the control part, this punch is especially suitable for punching the gastrointestinal tract in laparoscopic surgery.

Description of drawings

1 is a schematic diagram of the overall structure of the gastrointestinal tract punchers involved in Embodiment 1 and Embodiment 2;

Fig. 2 is the schematic diagram of the air path structure of embodiment 1 and embodiment 2, and the arrow in the figure represents the direction of air flow;

Fig. 3 is the internal structure schematic diagram of cutter head in embodiment 1;

4 is a schematic diagram of the internal structure of the tubular body in Example 1;

5 is a schematic diagram of the connection structure of the cutter head and the tubular body in Example 1;

6 is a schematic diagram of the positional relationship between the blade and the blade drive mechanism before the cutter head is not rotated in Embodiment 1;

7 is a schematic diagram of the positional relationship between the blade and the blade drive mechanism during the rotation of the cutter head in Embodiment 1;

FIG. 8 is a schematic diagram of the internal structure of the cutter head in Embodiment 2. FIG.

In the picture:

1——Puncher body 2——Cutter head

3 - Air Motor 1a - Housing

1b - Tubular body 1c - Adapter

2a - sleeve 2b - cutter head

2c - first drive shaft 2d - blade

2e - slide rail 2f - slider

2g——Blade limit part 2h——Baffle plate

3a——Second drive shaft 4a——First airflow branch

4b——Second air flow branch 4c——Tee joint

1a1——Button switch 2a1——The first suction hole

2b1——Second suction hole 2h1——Vent hole

4b1 - valve A - connecting rod

B——Roller C——Bearing.

Detailed ways

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be constructed in a specific orientation. and operation, and therefore should not be construed as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features.

In order to facilitate those skilled in the art to understand the concept of the present invention more clearly, further description will be made below with reference to the embodiments and accompanying drawings.

Example 1

1-7 show the structure of the gastrointestinal punch according to this embodiment. As shown in the figures, it includes a punch body 1 , a replaceable cutter head 2 , an air motor 3 and an air flow pipeline. The orifice body 1 includes a casing 1a and a tubular body 1b, the rear end of the tubular body 1b is fixedly connected to the casing 1a, and the casing 1a is provided with an adapter 1c for externally connecting a negative pressure suction device. The structure of the replaceable cutter head 2 is shown in Figures 3 and 5. Specifically, the cutter head 2 includes a sleeve 2a with an end cover at the front end and a cutter head 2b arranged in the sleeve 2a. The end is detachably connected to the front end of the tubular body 1b, the end cover of the sleeve 2a has a first suction hole 2a1, the cutter head 2b has a second suction hole 2b1 in its axial direction, the first suction hole 2a1 and the second suction hole 2b1 Connected, the cutter head 2b is connected to the first transmission shaft 2c, as shown in Figures 6 and 7, the blade 2d is hinged on the end face of the cutter head 2b and a blade reset mechanism and a blade drive mechanism are provided, and the first transmission shaft 2c drives the cutter head 2b During rotation, the blade drive mechanism moves under the action of centrifugal force, and pushes the blade 2d, which was originally located outside the second suction hole 2b1, to rotate around the hinge point to the position where it intersects with the second suction hole 2b1 (see Figure 7), and the cutter head 2b stops rotating. Afterwards, the blade reset mechanism drives the blade 2d to reverse around the hinge point and return to the position outside the second suction hole 2b1 (see FIG. 6 ). The air motor 3 is arranged in the housing 1a, wherein the output shaft of the air motor 3 is connected to the second transmission shaft 3a, which penetrates through the tubular body 1b and is detachably connected to the first transmission shaft 2c. The airflow pipeline includes a first airflow branch 4a, a second airflow branch 4b, and a three-way joint 4c connecting the rear ends of the first airflow branch 4a and the second airflow branch 4b to the adapter 1c. The first airflow branch The front end of the passage 4a communicates with the second suction hole 2b1, the air motor 3 is connected to the second air flow branch 4b, and a valve 4b1 for controlling the air intake of the air motor 3 is provided in the second air flow branch 4b.

During use, by connecting the adapter 1c to an external negative pressure suction device (those skilled in the art should understand that the present invention does not involve the improvement of the negative pressure suction device, the negative pressure suction device here refers to the A device for negative pressure suction, such as a negative pressure pump, a negative pressure suction device, etc.), utilizes the negative pressure suction in the first air flow branch 4a to suck the tissue of the part to be punched into the first suction hole 2a1 and suck the tissue through the second suction hole 2a1. The hole 2b1 is extruded, and then the valve 4b1 in the second air flow branch 4b is opened, the air motor 3 operates and drives the cutter head 2b to rotate through the first transmission shaft 2c and the second transmission shaft 3a, and finally makes the blade 2d rotate around the hinge point to At the position intersecting with the second suction hole 2b1, the tissue extruded from the second suction hole 2b1 is cut off to complete the punching.

Among them, as shown in FIGS. 6 and 7 , the blade driving mechanism includes a slide rail 2e arranged on one side of the hinge point of the blade and a slider 2f slidably connected to the slide rail 2e. When the cutter head 2b rotates, the slider 2f slides to the outside along the slide rail 2e under the action of centrifugal force, and the slider 2f pushes against the second half of the blade 2d and drives the blade 2d to rotate around the hinge point in the process of sliding outward, so that the blade 2d is rotated. The front half of the s is deflected downward to a position where it intersects with the second suction hole 2b1, thereby cutting off the tissue extruded from the second suction hole 2b1. It should be noted that the above-mentioned blade driving mechanism is not limited to the structure shown in the figure. For example, the second half of the blade 2d can be designed as a hollow structure, and a ball is arranged in the hollow cavity. When the disc 2b rotates, the balls are thrown outward by centrifugal force, thereby driving the blade 2d to rotate around the hinge point, so that the front half of the blade 2d is deflected downward to the position where it intersects with the second suction hole 2b1. In addition, the slider 2f can also be slidably arranged on the second half of the blade 2d, so that when the blade 2d rotates with the cutter head 2b, the slider 2f is slid to the outside by centrifugal force, and the blade 2d is also driven to rotate around the hinge point, so that the The front half of the blade 2d is deflected downward to a position where it intersects with the second suction hole 2b1.

Wherein, the blade reset mechanism may adopt a reset torsion spring (the reset torsion spring is not shown in the drawings), and the reset torsion spring connects the blade 2d and the cutter head 2b. It should be noted that, in the present invention, the blade reset mechanism is not limited to the torsion spring, for example, the blade reset mechanism can also be a magnet, as long as the magnet is arranged on the other side of the hinge point of the blade, when the cutter head 2b stops rotating , the magnet will attract the first half of the blade 2d and make it outside the second attraction hole 2b1. In addition, the blade reset mechanism can also be a tension spring. When the cutter head 2b stops rotating, the blade 2d can be driven to reverse around the hinge point and return to the position outside the second suction hole 2b1 through the resilience of the tension spring.

In addition, for the case of using a reset torsion spring or a tension spring as the blade reset mechanism, as shown in Figures 6 and 7, a blade limiting member 2g can also be provided on the cutter head 2b, and the blade limiting member 2g is provided at the blade hinge point. In this way, when the cutter head 2b stops rotating, under the action of the elastic force exerted by the return torsion spring, the front half of the blade 2d will abut against the blade limiting member 2g.

In practical application, the valve set in the second air flow branch 4b can be an on-off valve. In addition, an on-off valve is also set in the first air flow branch 4a. Correspondingly, the housing 1a is provided with a switch for controlling the aforementioned two switches Button switch 1a1 for valve opening and closing. As a preferred embodiment, the aforementioned valve for controlling the air intake of the air motor 3 is preferably a pressure limiting valve, so that the negative pressure suction in the first air flow branch 4a sucks the tissue at the site to be perforated After the first suction hole 2a1 is extruded through the second suction hole 2b1, with the further operation of the external negative pressure suction device, when the pressure difference between the second airflow branch 4b and the external environment reaches the set limit value of the pressure limiting valve , the pressure limiting valve will automatically open, and the outside air will flow to the air motor 3 through the pressure limiting valve, so that the air motor 3 will run. The advantage of this design is that the negative pressure in the first airflow branch 4a (after the second airflow branch 4b is turned on, the pressure of the first airflow branch 4a is released) will not be caused by the improper opening of the air motor 3 (premature opening). In the case of insufficient pressure and suction, it can better avoid the problems of insufficient suction of the tissue at the site to be punched and small unqualified punching size due to insufficient negative pressure. In practical application, in order to ensure the compactness of the structure, the pressure limiting valve is preferably arranged in the casing 1a, and the air inlet port of the second airflow branch 4b is preferably arranged on the casing 1a.

In addition, in this embodiment, as shown in Figures 3-5, a separator 2h is also provided in the sleeve 2a, the first transmission shaft 2c passes through the center of the separator 2h, and the separator 2h is provided with a ventilation hole 2h1, the diameter of the vent hole 2h1 is smaller than the diameter of the second suction hole 2b1, the outer peripheral surface of the partition plate 2h is provided with an external thread, and the partition plate 2h and the sleeve 2a are detachably connected by threads. The function of the baffle 2h is mainly to prevent the cut tissue from being sucked into the tubular body 1b. Of course, a baffle member can also be provided at the front end of the tubular body 1b to replace the baffle 2h arranged in the sleeve 2a. 2. With a one-time-use design, the cutter head 2 can be discarded after operation. If the cutter head 2 needs to be reused, since the separator 2h and the sleeve 2a are threaded, it is more convenient for the cutter head 2 to be dismantled and washed. For the disposable cutter head 2, the cutter head 2b can be made of engineering plastics. In order to facilitate the disassembly and assembly of the cutter head 2, a spline connection is preferably used between the first transmission shaft 2c and the second transmission shaft 3a.

Example 2

The difference between this embodiment and Embodiment 1 mainly lies in the internal structure of the cutter head 2. In Embodiment 1, the cutter head 2d and the first transmission shaft 2c are connected by a connecting rod A (see FIG. 3 and FIG. 5), in this embodiment, the drum B in FIG. 8 can be used to connect the cutter head 2d and the first transmission shaft 2c, the cutter head 2d is connected to the front end of the drum B, and the first transmission shaft 2c is connected to the drum At the rear end of B, in addition, a bearing C can be provided between the drum B and the sleeve 2a as shown in the figure to reduce the friction between the drum B and the sleeve 2a and ensure that the drum B can rotate smoothly.

The above-mentioned embodiments are the preferred implementation solutions of the present invention, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the technical solution.

In order to make it easier for those skilled in the art to understand the improvements of the present invention relative to the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are also omitted in this application document, One of ordinary skill in the art would realize that these omitted elements may also constitute the subject matter of the present invention.

Claims (10)

1. A gastrointestinal perforator, comprising:

the hole puncher comprises a hole puncher body (1), wherein the hole puncher body (1) comprises a shell (1a) and a tubular body (1b), the rear end of the tubular body (1b) is fixedly connected to the shell (1a), and an adapter (1c) for externally connecting a negative pressure suction device is arranged on the shell (1 a);

removable tool bit (2), tool bit (2) are in including sleeve (2a) that the front end was equipped with the end cover and setting cutter disc (2b) in sleeve (2a), the front end of connecting siphonozooid (1b) can be dismantled to the rear end of sleeve (2a), set up first attraction hole (2a1) on the end cover of sleeve (2a), cutter disc (2b) is seted up second attraction hole (2b1) on its axis direction, first attraction hole (2a1) and second attraction hole (2b1) intercommunication, first transmission shaft (2c) is connected in cutter disc (2b) articulated blade (2d) and set up blade canceling release mechanical system and blade actuating mechanism on the terminal surface of cutter disc (2b), when first transmission shaft (2c) drive cutter disc (2b) rotate, blade actuating mechanism moves under the centrifugal force effect to promote to be located originally blade (2d) in the second attraction hole (2b1) outside rotate to pin joint around the pin joint The cutter blade resetting mechanism drives the cutter blade (2d) to reversely rotate around a hinge point and return to the position outside the second suction hole (2b1) after the cutter head (2b) stops rotating;

the pneumatic motor (3) is arranged in the shell (1a), the output shaft of the pneumatic motor (3) is connected with a second transmission shaft (3a), and the second transmission shaft (3a) is arranged in the tubular body (1b) in a penetrating manner and is detachably connected with the first transmission shaft (2 c);

the air flow pipeline comprises a first air flow branch (4a), a second air flow branch (4b) and a three-way joint (4c) which connects the rear ends of the first air flow branch (4a) and the second air flow branch (4b) with the adapter (1c), the front end of the first air flow branch (4a) is communicated with a second suction hole (2b1), the pneumatic motor (3) is connected in the second air flow branch (4b), and a valve (4b1) for controlling air intake of the pneumatic motor (3) is arranged in the second air flow branch (4 b);

the tissue at the position to be punched is sucked into a first suction hole (2a1) and extruded out through a second suction hole (2b1) by using the negative pressure suction force in the first air flow branch (4a) through an external negative pressure suction device of the adapter (1c), then a valve (4b1) in the second air flow branch (4b) is opened, the pneumatic motor (3) operates and drives a cutter head (2b) to rotate through a first transmission shaft (2c) and a second transmission shaft (3a), finally the blade (2d) rotates around a hinge point to a position which is intersected with the second suction hole (2b1), and the tissue extruded out of the second suction hole (2b1) is cut off, so that punching is completed.

2. The gastrointestinal tract punch of claim 1, wherein:

blade actuating mechanism is including setting up slide rail (2e) and the slider (2f) on slide rail (2e) in blade pin joint one side, when blade disc (2b) rotated, slider (2f) slide along slide rail (2e) toward the outside under the centrifugal force effect, slider (2f) push the back half section of propping up blade (2d) and drive blade (2d) and rotate around the pin joint toward the gliding in-process outward, make the first half section of blade (2d) deflects down to attracting the crossing position in hole (2b1) with the second, thereby will follow the tissue of extruding in the second attracts hole (2b1) cuts off.

3. The gastrointestinal punch of claim 2, wherein:

the blade resetting mechanism comprises a resetting torsion spring which is connected with the blade (2d) and the cutter head (2 b).

4. The gastrointestinal punch of claim 3, wherein:

still be equipped with a blade stop part (2g) on blade disc (2b), blade stop part (2g) set up the opposite side at the blade pin joint, when blade disc (2b) stall, receive the spring action that the reset torsion spring was applyed, the first half section of blade (2d) supports and leans on blade stop part (2 g).

5. The gastrointestinal punch of claim 2, wherein:

the blade resetting mechanism comprises a magnet, the magnet is arranged on the other side of the hinge point of the blade, and when the cutter head (2b) stops rotating, the magnet attracts the front half section of the blade (2d) and enables the blade to be positioned on the outer side of the second attraction hole (2b 1).

6. The gastrointestinal punch according to any one of claims 1 to 5, wherein:

the valve for controlling air intake of the pneumatic motor (3) is a pressure limiting valve, after the negative pressure suction force in the first air flow branch (4a) sucks the tissue at the position to be punched into the first suction hole (2a1) and extrudes the tissue through the second suction hole (2b1), along with the further work of the external negative pressure suction device, when the pressure difference between the second air flow branch (4b) and the external environment reaches the set limit value of the pressure limiting valve, the pressure limiting valve is opened, and the external air flows to the pneumatic motor (3) through the pressure limiting valve, so that the pneumatic motor (3) operates.

7. The gastrointestinal punch of claim 6, wherein:

the pressure limiting valve is arranged in the shell (1a), and the air inlet port of the second airflow branch (4b) is arranged on the shell (1 a).

8. The gastrointestinal punch according to any one of claims 1 to 5, wherein:

the valve arranged in the second air flow branch (4b) is a switch valve, the switch valve is also arranged in the first air flow branch (4a), and the shell (1a) is provided with a button switch (1a1) for controlling the opening and closing of the two switch valves.

9. The gastrointestinal punch according to any one of claims 1 to 5, wherein:

be equipped with baffle (2h) in sleeve (2a), first transmission shaft (2c) pass from the center of baffle (2h), air vent (2h1) have been seted up on baffle (2h), the diameter of air vent (2h1) is less than the diameter of second attraction hole (2b1), the outer peripheral face of baffle (2h) is equipped with the external screw thread, baffle (2h) and sleeve (2a) are through the screw thread detachable connection.

10. The gastrointestinal punch according to any one of claims 1 to 5, wherein: the cutter head (2b) is made of engineering plastics, and the first transmission shaft (2c) is connected with the second transmission shaft (3a) through a spline.

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