Mechanical pressure relief type negative pressure mechanism for loop ligature device

Abstract

The utility model relates to the technical field of ligation devices, in particular to a mechanical pressure relief type negative pressure mechanism for a ligation device, which comprises an air suction pipe and a pressure relief pipe. One end of the pressure relief pipe is communicated with the air suction pipe, a pressure relief cavity is formed in the other end of the pressure relief pipe, the pressure relief cavity is provided with a closed end and an open end which are oppositely arranged, a piston is installed in the pressure relief cavity in a sliding mode, one side of the piston is connected with a piston rod, the piston divides the pressure relief cavity into a rod cavity and a rodless cavity, and an elastic piece is arranged in the rodless cavity; one end of the elastic piece is connected with the piston, the other end of the elastic piece is connected with the end face of the closed end, the piston rod extends out of the open end from the rod cavity and is connected with a button, and a sealing piece is arranged between the piston and the end face of the open end. The button is matched with the piston to open or close the open end of the pressure relief cavity to achieve pressure relief or sealing of the pressure relief cavity, mechanical control is completely adopted, the structure is simple, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of ligatures, in particular to a mechanical pressure relief type negative pressure mechanism for ligatures. Background Art

[0002] The ligation device uses a negative pressure mechanism to suck the lesion into the suction tube, and at the same time pushes out the rubber ring at the tube mouth so that it is wrapped around the root of the lesion, cutting off the blood supply to cause it to necrotize and then fall off.

[0003] The negative pressure mechanism generally includes a negative pressure pump, an intake pipe connected to the intake port of the negative pressure pump, an exhaust pipe connected to the exhaust port of the negative pressure pump, and a pressure relief pipe connected to the intake pipe for relieving pressure in the intake pipe. A pressure relief mechanism is provided at the end of the pressure relief pipe. The pressure relief mechanisms in the prior art are all electrically controlled. However, the electrically controlled structure requires the setting of a circuit, which results in a complex structure and low reliability of the electrically controlled structure. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the problem that the pressure relief mechanisms in the prior art are all electrically controlled, but the electric control structure needs to be provided with a circuit, resulting in a complex structure and low reliability of the electric control structure, a mechanical pressure relief negative pressure mechanism for a ligation device is now provided.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a mechanical pressure relief type negative pressure mechanism for a ligation device, comprising a suction tube for adsorbing the lesion site and a pressure relief tube for relieving the pressure of the suction tube so as to separate the suction tube from the lesion site;

[0006] One end of the pressure relief pipe is connected to the intake pipe, and a pressure relief chamber is formed at the other end. The pressure relief chamber has a closed end and an open end that are relatively arranged, and a piston is slidably installed in the pressure relief chamber. A piston rod is connected to one side of the piston and the piston divides the pressure relief chamber into a rod chamber and a rodless chamber. An elastic member is provided in the rodless chamber, one end of the elastic member is connected to the piston, and the other end is connected to the end face of the closed end. The piston rod extends out of the rod chamber from the open end and is connected to a button. A sealing member is provided between the side surface of the piston and the end face of the open end. When the piston fits with the end face of the open end, the pressure relief chamber is in a closed state. When the piston is separated from the end face of the open end, the pressure relief chamber is in a pressure relief state.

[0007] Furthermore, the negative pressure mechanism is located inside the shell, and the shell is provided with a front limit portion for limiting the forward movement of the button and a rear limit portion for limiting the backward movement of the button. The upper end of the button extends into the shell for cooperating with the front limit portion, and the lower end of the button protrudes with an abutment portion for cooperating with the rear limit portion.

[0008] Furthermore, the button has a pressing surface for the operator to press, the pressing surface is concave and has a plurality of anti-slip protrusions arranged at intervals.

[0009] Furthermore, a cap is threadedly connected to the closed end to close the end.

[0010] Furthermore, the central part of the cap protrudes toward the pressure relief chamber to form a guide portion, and the end of the elastic member close to the cap is sleeved outside the guide portion.

[0011] Furthermore, a plug-in portion is protruded from the outer wall of the pressure relief pipe, and a plug-in hole for inserting the plug-in portion is formed on the inner wall of the shell.

[0012] Beneficial effects of the utility model: the utility model utilizes a button and a piston to cooperate to open or close the open end of the pressure relief chamber to achieve pressure relief or closure of the pressure relief chamber, and completely adopts mechanical control, has a simple structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 yes Figure 2 A partial enlarged view of part A;

[0017] Figure 4 It is a schematic diagram of the structure of the utility model with part of the shell removed;

[0018] Figure 5 yes Figure 4 A partial enlarged view of part B;

[0019] In the figure:

[0020] 1. Shell; 101. Front limit part; 102. Rear limit part;

[0021] 2. Inhalation pipe;

[0022] 3. Pressure relief pipe; 301; Pressure relief chamber; 3011; Closed end; 3012; Open end; 3013; Rod chamber; 3014; Rodless chamber; 302; Cover cap; 3021; ​​Guide part; 303; Connecting part;

[0023] 4. Piston;

[0024] 5. Piston rod;

[0025] 6. Elastic parts;

[0026] 7. button; 701. abutment portion; 702. pressing surface; 703. anti-slip protrusion;

[0027] 8. Negative pressure generator;

[0028] 9. Exhaust pipe;

[0029] 10. Seals. DETAILED DESCRIPTION

[0030] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter for which protection is sought is limited only by the attached claims and their equivalents.

[0031] Embodiment 1:

[0032] like Figure 1-Figure 5 As shown, a mechanical pressure relief type negative pressure mechanism for a ligation device comprises a negative pressure generator 8, a suction tube 2 for adsorbing the lesion site, a pressure relief tube 3 for relieving the pressure of the suction tube 2 to separate the suction tube 2 from the lesion site, and an exhaust pipe 9 for exhausting the gas inhaled from the suction tube 2, wherein the pressure relief tube 3 is located in the middle of the suction tube 2;

[0033] One end of the pressure relief pipe 3 is connected to the air intake pipe 2, and the other end forms a transversely arranged pressure relief chamber 301, and the pressure relief chamber 301 has a closed end 3011 and an open end 3012 arranged opposite to each other, thereby forming a pressure relief pipe 3 with a three-way pipe structure, and a piston 4 is slidably installed in the pressure relief chamber 301, and a piston rod 5 is connected to one side of the piston 4, and the piston 4 divides the pressure relief chamber 301 into a rod chamber 3013 and a rodless chamber 3014, and an elastic member 6 is arranged in the rodless chamber 3014, and one end of the elastic member 6 is connected to the piston 4, and the other end is connected to the closed end 3011 and the open end 3012. The piston rod 5 extends from the rod cavity 3013 to the open end 3012 and is connected with a button 7. The open end 3012 is closed and a gap is left between the open end 3012 and the piston rod 5. A seal 10 is provided between the side surface of the piston 4 and the end surface of the open end 3012. The seal 10 can be an O-ring. When the piston 4 fits with the end surface of the open end 3012, the pressure relief cavity 301 is in a closed state. When the piston 4 is separated from the end surface of the open end 3012, the pressure relief cavity 301 is in a pressure relief state.

[0034] In the initial state, the piston 4 is fitted with the end surface of the open end 3012 under the action of the elastic member 6, and the open end 3012 is blocked under the action of the sealing member 10. At this time, the pressure relief chamber 301 is in a closed state, and a negative pressure can be formed in the suction pipe 2 to adsorb the lesion site; when pressure relief is required, the button 7 is pressed, and the button 7 drives the piston 4 to move toward the closed end 3011 through the piston rod 5. The piston 4 is separated from the end surface of the open end 3012, and the gas in the suction pipe 2 can flow out through the open end 3012 of the pressure relief pipe 3. The sealing member 10 arranged on the side will not affect the movement of the piston 4 and fits with the open end 3012 to achieve a good sealing effect.

[0035] In some examples, the negative pressure mechanism is located inside the shell 1, and the shell 1 is provided with a front limit portion 101 for limiting the forward movement of the button 7 and a rear limit portion 102 for limiting the backward movement of the button 7. The upper end of the button 7 extends into the shell 1 for cooperating with the front limit portion 101, and the lower end of the button 7 protrudes with an abutment portion 701 for cooperating with the rear limit portion 102. The stroke of the button 7 is located between the front limit portion 101 and the rear limit portion 102; when the button 7 is pressed, the button 7 overcomes the action of the elastic member 6 and moves backward until the abutment portion 701 abuts against the rear limit portion 102, and the button 7 stops acting; when the button 7 is released, the button 7 moves forward under the resetting action of the elastic member 6 until it abuts against the front limit portion 101, and the button 7 stops acting.

[0036] In some examples, the button 7 has a pressing surface 702 for the operator to press. The pressing surface 702 is concave, which is more ergonomic, and has a number of anti-slip protrusions 703 arranged at intervals on the pressing surface 702, thereby increasing the friction between the pressing surface 702 and the pressing surface 702.

[0037] In some examples, a cap 302 is threadedly connected to the closed end 3011 to close the end.

[0038] In some examples, a guide portion 3021 is formed at the center of the cap 302 protruding toward the pressure relief chamber 301, and one end of the elastic member 6 close to the cap 302 is sleeved on the outside of the guide portion 3021. The guide portion 3021 can provide guidance for the elastic member 6 to prevent the elastic member 6 from tilting during compression or resetting.

[0039] In some examples, the outer wall of the pressure relief pipe 3 is protruded to form a plurality of plug-in parts 303, and the plurality of plug-in parts 303 are distributed circumferentially. The inner wall of the shell 1 is provided with plug-in holes for inserting the plug-in parts 303, and the number of the plug-in holes corresponds to the number of the plug-in parts 303. The plug-in parts 303 are inserted into the plug-in holes to fix the pressure relief pipe 3.

[0040] Working principle:

[0041] In the initial state, the piston 4 is fitted with the end surface of the open end 3012 under the action of the elastic member 6, and the open end 3012 is blocked under the action of the sealing member 10. At this time, the pressure relief chamber 301 is in a closed state, and a negative pressure can be formed in the suction pipe 2 to adsorb the lesion site; when pressure relief is required, the button 7 is pressed, and the button 7 drives the piston 4 to move toward the closed end 3011 through the piston rod 5. The piston 4 is separated from the end surface of the open end 3012, and the gas in the suction pipe 2 can flow out through the open end 3012 of the pressure relief pipe 3. At this time, the pressure relief chamber 301 is in a pressure relief state.

[0042] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mechanical pressure relief negative pressure mechanism for a ligation device, characterized in that: It comprises an air suction tube (2) for adsorbing the lesion site and a pressure relief tube (3) for relieving the pressure of the air suction tube (2) so as to separate the air suction tube (2) from the lesion site; One end of the pressure relief pipe (3) is in communication with the air intake pipe (2), and the other end forms a pressure relief chamber (301), wherein the pressure relief chamber (301) has a closed end (3011) and an open end (3012) arranged opposite to each other, and a piston (4) is slidably mounted in the pressure relief chamber (301), one side of the piston (4) is connected to a piston rod (5), and the piston (4) divides the pressure relief chamber (301) into a rod chamber (3013) and a rodless chamber (3014), and an elastic member (6) is arranged in the rodless chamber (3014), and the elastic member (6) One end is connected to the piston (4), and the other end is connected to the end face of the closed end (3011); the piston rod (5) extends from the rod cavity (3013) to the open end (3012) and is connected to a button (7); a sealing member (10) is provided between the side of the piston (4) and the end face of the open end (3012); when the piston (4) and the end face of the open end (3012) are in contact, the pressure relief cavity (301) is in a closed state; when the piston (4) and the end face of the open end (3012) are separated, the pressure relief cavity (301) is in a pressure relief state.

2. A mechanical pressure relief negative pressure mechanism for a ligation device according to claim 1, characterized in that: The negative pressure mechanism is located inside the housing (1); the housing (1) is provided with a front limiting portion (101) for limiting the forward movement of the button (7) and a rear limiting portion (102) for limiting the backward movement of the button (7); the upper end of the button (7) extends into the housing (1) for cooperating with the front limiting portion (101); the lower end of the button (7) protrudes with an abutting portion (701) for cooperating with the rear limiting portion (102).

3. The mechanical pressure relief negative pressure mechanism for a ligation device according to claim 1, characterized in that: The button (7) has a pressing surface (702) for the operator to press, and the pressing surface (702) is concave and has a plurality of anti-slip protrusions (703) protruding thereon at intervals.

4. The mechanical pressure relief negative pressure mechanism for a ligation device according to claim 1, characterized in that: The closed end (3011) is threadedly connected with a cap (302) to close the end.

5. A mechanical pressure relief negative pressure mechanism for a ligation device according to claim 4, characterized in that: The central part of the cover cap (302) protrudes in the direction of the pressure relief chamber (301) to form a guide portion (3021), and one end of the elastic member (6) close to the cover cap (302) is sleeved outside the guide portion (3021).

6. A mechanical pressure relief negative pressure mechanism for a ligation device according to claim 2, characterized in that: The outer wall of the pressure relief pipe (3) is protruding to form an inserting portion (303), and the inner wall of the shell (1) is provided with an inserting hole for inserting the inserting portion (303).

Images