Negative pressure needle tube with limiting structure and sustainable negative pressure

Abstract

The invention discloses a sustainable negative pressure negative pressure needle tube with a limiting structure, which comprises a barrel, a liquid outlet end arranged at the top of the barrel, scales arranged on the surface of the front side of the barrel, a needle seat fixedly connected to the top end of the barrel, a soft piston slidably connected to the inside of the barrel, a connecting piece fixedly connected to the bottom of the soft piston, and a piston rod fixedly connected to the bottom of the connecting piece. The bottom end of the piston rod is fixedly connected with a push plate, a negative pressure area is arranged on the right of the front side of the piston rod, and a positioning area is arranged on the left of the front side of the piston rod. Through the piston rod sliding in the cylinder body and the insertion block fixed to the front side in the cylinder body in a matched mode, when the piston rod is pulled outwards and negative pressure is generated in the cylinder body, the piston rod is rotated, the insertion block is fixed between the first blocking pieces on the front side of the piston rod or above the second blocking pieces, and the soft piston at the top end of the piston rod is fixed; the negative pressure state is kept all the time, meanwhile, the remaining liquid in the barrel can be controlled, and the purpose of quantitative control is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of needle tubes, and in particular to a negative pressure needle tube with a limiting structure and sustainable negative pressure. Background Art

[0002] In the medical field, negative pressure syringes are a common medical device, mainly used to extract body fluids or liquid medicines. Traditional negative pressure syringes are usually composed of a syringe body, a needle, a piston and a sealing ring. When in use, the needle is inserted into the target object, and negative pressure is generated by the movement of the piston, causing the liquid to enter the syringe.

[0003] However, there are some problems with the existing negative pressure needle tubes during use. First, when the existing negative pressure needle tubes are extracting liquid, the sealing ring between the piston and the needle tube body is easily worn or aged, resulting in a decrease in the sealing performance, thereby affecting the continuity of the negative pressure. This will result in the need to repeatedly push and pull the piston during the extraction process to maintain the negative pressure, increasing the complexity of the operation; secondly, when the existing negative pressure needle tubes are extracting liquid, the movement range of the piston in the needle tube is not restricted, and it is easy to over-extract, resulting in a loss of negative pressure, which will not only affect the extraction effect, but may also cause damage to the target object. Summary of the invention

[0004] The object of the present invention is to provide a negative pressure needle tube with a limiting structure and sustainable negative pressure, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A negative pressure needle tube with a limiting structure for sustainable negative pressure comprises a cylinder, a liquid outlet is arranged on the top of the cylinder, a scale is arranged on the front surface of the cylinder, a needle seat is fixedly connected to the top of the cylinder, a soft piston is slidably connected inside the cylinder, a connecting piece is fixedly connected to the bottom of the soft piston, a piston rod is fixedly connected to the bottom of the connecting piece, a push plate is fixedly connected to the bottom end of the piston rod, a negative pressure area is opened on the right side of the front side of the piston rod, a positioning area is opened on the left side of the front side of the piston rod, and active areas are opened on the left and right sides of the rear side of the piston rod. A second baffle is fixedly connected to the upper right side of the end face, a first baffle is fixedly connected longitudinally in the positioning area on the right side of the front side of the piston rod, a first groove is opened at the top lower right side of the piston rod, a second groove is opened at the top lower left side of the piston rod, an adhesive layer is adhered to the middle below the front end face of the cylinder body, an arc-shaped fixing plate is adhered to the front end face of the adhesive layer, a pull ring is fixedly connected to the front end face of the arc-shaped fixing plate, an insert is fixedly connected to the rear end face of the arc-shaped fixing plate, a rubber ring is fixedly connected to the outside of the insert, and a through groove is opened in the middle below the front end face of the cylinder body.

[0007] As a further solution of the present invention: the outer edge of the connecting piece contacts the inner wall of the cylinder, the lower middle of the front side of the cylinder is fixedly connected to the front outer side of the plug block, and the upper and lower sides of the rubber ring and the plug block are in contact with the first baffle and the second baffle, so as to fix the soft piston at the top of the piston rod, which not only maintains a negative pressure state all the time, but also controls the retained liquid in the cylinder to achieve the purpose of quantitative control.

[0008] As a further solution of the present invention: the capacity of the cylinder body is 20 milliliters, and the scale on the front end surface of the cylinder body is distributed longitudinally at the front end of the cylinder body with every five milliliters as a unit. It not only serves as a scale displayed outside the cylinder body, but also allows the first baffle to be set at the position marked every five milliliters for easy control.

[0009] As a further solution of the present invention: an internal thread is provided on the side of the needle seat close to the liquid outlet, and the distance between the needle seat and the liquid outlet is one centimeter, so that the tail end of the needle can be inserted into the inner side of the needle seat and the liquid outlet and rotated to fix the needle at the liquid outlet position.

[0010] As a further solution of the present invention: the length of the piston rod matches the length of the inner wall of the cylinder, and a circulation groove is opened at the top upper front side of the piston rod, and the circulation groove is used for circulation of the positioning area and the active area of ​​the piston rod. When the soft piston needs to perform negative pressure operation on the liquid in the cylinder, the plug can be distributed in the negative pressure area or the positioning area according to needs.

[0011] As a further solution of the present invention: the first baffle is arranged in the positioning area of ​​the piston rod, and the second baffle is arranged in the negative pressure area of ​​the piston rod, the number of the first baffles is four, and the longitudinal distribution distance of the first baffles matches the scale position of every five milliliters on the outside of the cylinder, and the first baffle is used to control the amount of liquid in the cylinder that is operated by negative pressure, so that the liquid in the cylinder always maintains a negative pressure state.

[0012] As a further solution of the present invention: the shape of the second baffle and the second baffle are both triangles with an arc at the top, and the position of the second baffle is parallel to the position of the first baffle at the top of the positioning area. When the piston rod is pulled outward and negative pressure is generated in the cylinder, the piston rod can be rotated so that the insert block is fixed between the first baffles on the front side of the piston rod or above the second baffle.

[0013] As a further solution of the present invention: the first groove of the piston rod is arranged at a position close to the cylinder on the right rear side below the negative pressure zone, and the second groove of the piston rod is arranged at a position close to the cylinder on the left rear side below the positioning zone. The upper and lower heights of the first groove and the second groove are 1.5 times the upper and lower heights of the insert block. If the soft piston in the cylinder body needs to slide normally, the piston rod can be rotated to allow the insert block to pass through the first groove or the second groove, so that the insert block is in the active area without the first baffle and the second baffle.

[0014] As a further solution of the present invention: the longitudinal section shape of the through groove in the middle of the lower front side of the cylinder body matches the longitudinal section shape of the plug block, and the distance between the top end of the plug block and the top end of the inner side of the piston rod when the plug block enters the cylinder body is half of the front and rear length of the plug block. The through groove is opened for the plug block to be inserted into the cylinder body, and the purpose of reusing the arc-shaped fixing plate and its structure can also be achieved.

[0015] As a further solution of the present invention: the inner curvature of the arc-shaped fixing plate matches the curvature of the surface of the cylinder, and the arc-shaped fixing plate and the cylinder are bonded by an adhesive layer. There are two rubber rings, and the rubber rings are distributed on the front and back sides of the outer side of the plug. The rubber rings can increase the contact friction between the plug and the first baffle and the second baffle, thereby preventing the plug from easily sliding on the outside of the first baffle and the second baffle, causing the liquid in the cylinder to lose negative pressure.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: through the piston rod sliding in the cylinder and the insert block fixed on the front side of the cylinder, the present invention can rotate the piston rod when the piston rod is pulled outward and negative pressure is generated in the cylinder, so that the insert block is fixed between the first baffles on the front side of the piston rod or above the second baffle, thereby fixing the soft piston at the top of the piston rod, which not only maintains a negative pressure state all the time, but also controls the retained liquid in the cylinder to achieve the purpose of quantitative control. If the soft piston in the cylinder needs to slide normally, the piston rod can be rotated to allow the insert block to pass through the first groove or the second groove, so that the insert block is in the active area without the first baffle and the second baffle, which can be used for aspirating thrombus, various small stones, effusion or drainage. 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 a schematic diagram of the overall exploded three-dimensional structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the piston rod of the present invention when it is rotated 180 degrees horizontally.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the longitudinal section of the cylinder of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the arc-shaped fixing plate of the present invention after being flipped 180 degrees horizontally.

[0022] In the figure, 1, cylinder; 101, liquid outlet; 102, scale; 103, through groove; 2, needle seat; 3, push plate; 301, piston rod; 302, connecting plate; 303, soft piston; 304, first baffle; 305, second baffle; 306, negative pressure area; 307, first groove; 308, active area; 309, second groove; 310, positioning area; 4, arc-shaped fixing plate; 401, pull ring; 402, plug block; 403, adhesive layer; 404, rubber ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 In an embodiment of the present invention, a negative pressure needle tube with a limiting structure and sustainable negative pressure includes a cylinder 1, a liquid outlet 101 is arranged on the top of the cylinder 1, a scale 102 is arranged on the front surface of the cylinder 1, a needle seat 2 is arranged on the top of the cylinder 1, a soft piston 303 is inserted into the cylinder 1 and slides, a connecting piece 302 is arranged at the bottom of the soft piston 303, a piston rod 301 is arranged at the bottom of the connecting piece 302, a push plate 3 is arranged at the bottom of the piston rod 301, a negative pressure area 306 is arranged on the right side of the front side of the piston rod 301, a positioning area 310 is arranged on the left side of the front side of the piston rod 301, and an activity area 308 is arranged on both the left and right sides of the rear side of the piston rod 301. A second baffle 305 is arranged on the upper right side of the front end face 301, a first baffle 304 is longitudinally arranged in the positioning area 310 on the right side of the front side of the piston rod 301, a first groove 307 is arranged at the top of the lower right side of the piston rod 301, a second groove 309 is arranged at the top of the lower left side of the piston rod 301, the middle of the lower front end face of the cylinder 1 is adhered by an adhesive layer 403, the front end face of the adhesive layer 403 is adhered to the arc-shaped fixing plate 4, the front end face of the arc-shaped fixing plate 4 is welded with a pull ring 401, the rear end face of the arc-shaped fixing plate 4 is welded with an insert 402, the outer side of the insert 402 is adhered to a rubber ring 404 by adhesive, and a through groove 103 is arranged in the middle of the lower front end face of the cylinder 1;

[0025] like Figure 1-Figure 5 The outer edge of the connecting piece 302 contacts the inner wall of the cylinder 1, and the middle of the lower front side of the cylinder 1 is fixedly connected to the front outer side of the plug block 402. The rubber ring 404 and the upper and lower sides of the plug block 402 are in contact with the first baffle 304 and the second baffle 305, so as to fix the soft piston 303 at the top of the piston rod 301, which not only maintains a negative pressure state, but also controls the retained liquid in the cylinder 1 to achieve the purpose of quantitative control.

[0026] The capacity of the cylinder 1 is 20 milliliters, and the scale 102 on the front end surface of the cylinder 1 is distributed longitudinally at the front end of the cylinder 1 with every five milliliters as a unit. It not only serves as the scale 102 displayed outside the cylinder 1, but also allows the first baffle 304 to be set at the position marked every five milliliters for easy control.

[0027] An internal thread is provided on one side of the needle seat 2 close to the liquid outlet end 101 , and the distance between the needle seat 2 and the liquid outlet end 101 is one centimeter, so that the tail end of the needle can be inserted into the inner side of the needle seat 2 and the liquid outlet end 101 and rotated to fix the needle at the position of the liquid outlet end 101 .

[0028] The length of the piston rod 301 matches the length of the inner wall of the cylinder 1. A circulation groove 103 is opened at the top of the front side of the piston rod 301, and the circulation groove 103 is used for circulation of the positioning area 310 and the active area 308 of the piston rod 301. When the soft piston 303 needs to perform negative pressure operation on the liquid in the cylinder 1, the insert 402 can be distributed in the negative pressure area 306 or the positioning area 310 according to needs.

[0029] The first baffle 304 is arranged in the positioning area 310 of the piston rod 301, and the second baffle 305 is arranged in the negative pressure area 306 of the piston rod 301. The number of the first baffles 304 is four, and the longitudinal distribution distance of the first baffles 304 matches the position of the scale 102 on the outside of the cylinder 1 with five milliliters as a unit. The first baffle 304 is used to control the amount of liquid in the cylinder 1 that is operated by negative pressure, so that the liquid in the cylinder 1 always maintains a negative pressure state.

[0030] The shapes of the second baffle 305 and the second baffle 305 are both triangles with an arc at the top, and the position of the second baffle 305 is parallel to the position of the first baffle 304 at the top of the positioning area 310. When the piston rod 301 is pulled outward and negative pressure is generated in the cylinder 1, the piston rod 301 is rotated to allow the insert 402 to be fixed between the first baffle 304 on the front side of the piston rod 301 or above the second baffle 305.

[0031] The first groove 307 of the piston rod 301 is arranged at the right rear side below the negative pressure zone 306 close to the cylinder 1, and the second groove 309 of the piston rod 301 is arranged at the left rear side below the positioning zone 310 close to the cylinder 1. The upper and lower heights of the first groove 307 and the second groove 309 are 1.5 times the upper and lower heights of the insert block 402. If the soft piston 303 in the cylinder 1 needs to slide normally, the piston rod 301 can be rotated to allow the insert block 402 to pass through the first groove 307 or the second groove 309, so that the insert block 402 is in the active area 308 without the first baffle 304 and the second baffle 305.

[0032] The longitudinal section shape of the through groove 103 in the middle of the lower front side of the cylinder 1 matches the longitudinal section shape of the plug block 402, and the distance between the top of the plug block 402 and the top of the inner side of the piston rod 301 when the plug block 402 enters the cylinder 1 is half of the front-to-back length of the plug block 402. The through groove 103 is opened for the plug block 402 to be inserted into the cylinder 1, and can also achieve the purpose of reusing the arc-shaped fixing plate 4 and its structure.

[0033] The inner curvature of the arc-shaped fixing plate 4 matches the curvature of the surface of the cylinder 1, and the arc-shaped fixing plate 4 and the cylinder 1 are bonded by an adhesive layer 403. There are two rubber rings 404, and the rubber rings 404 are distributed on the front and back sides of the outer side of the plug 402. The rubber ring 404 can increase the contact friction between the plug 402 and the first baffle 304 and the second baffle 305, so as to prevent the plug 402 from easily sliding on the outside of the first baffle 304 and the second baffle 305, resulting in the loss of negative pressure of the liquid in the cylinder 1.

[0034] In actual use of the needle tube, the tail of the needle is connected to the liquid outlet 101 at the top of the barrel 1 and the position of the needle seat 2 according to actual conditions. The tail of the needle is provided with an external thread, and the tail of the needle is inserted between the needle seat 2 and the liquid outlet 101 and rotated so that the external thread at the tail end of the needle and the internal thread on the inner side of the needle seat 2 are screwed and tightened with each other. After the needle is installed, the arc-shaped fixing plate 4 is installed. The operator hooks the pull ring 401 with his fingers and inserts the insert block 402 into the through groove 103 at the lower part of the inside of the barrel 1 until the adhesive layer 403 on the rear end surface of the arc-shaped fixing plate 4 is adhered to the outer side of the through groove 103 of the barrel 1. At this time, the insert block 402 and the rubber ring 404 on the outer side of the insert block 402 are fixed at the lower front position inside the barrel 1.

[0035] If it is necessary to store liquid in the cylinder 1 and keep the negative pressure state at all times, the operator can rotate the piston rod 301 according to the situation, and the piston rod 301 drives the push plate 3, the connecting piece 302 and the soft piston 303 to rotate together. At this time, the plug block 402 is in the positioning area 310, and when the plug block 402 is required to be in the negative pressure area 306, the piston rod 301 is rotated to the right top of the positioning area 310, and then pulled downward, the piston rod 301 drives the soft piston 303 to move downward on the inner wall of the cylinder 1, and the liquid also enters the cylinder 1 through the liquid outlet end 101. At this time, the liquid is in a negative pressure state, and then the top of the positioning area 310 of the piston rod 301 contacts the plug block 402, and rotates right to allow the plug block 402 to enter the negative pressure area 306 and contact the second baffle 305 at the top of the negative pressure area 306. At this time, the liquid in the cylinder 1 is The soft piston 303 slides upward automatically, while the insert block 402 is restricted on the top of the second baffle 305, so that the piston rod 301 cannot slide due to the negative pressure; if quantitative extraction is required, it is only necessary to observe the scale 102 on the outside of the cylinder 1 during the extraction process, and the first baffle 304 in the positioning area 310 is flush with the scale 102 of every five millimeters. When the set extraction capacity is reached, the piston rod 301 is rotated to the left to allow the top or bottom of the first baffle 304 to stick to the outside of the insert block 402; if the piston rod 301 needs to be pulled normally, before extracting the liquid, the piston rod 301 is rotated to allow the insert block 402 to pass through the first groove 307 on the right side of the negative pressure area 306 or the second groove 309 on the left side of the positioning area 310, and enter the active area 308 where the first baffle 304 and the second baffle 305 are not set.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A negative pressure needle tube with a limiting structure and sustainable negative pressure, comprising a barrel (1), Features: The top of the cylinder (1) is provided with a liquid outlet (101), the front surface of the cylinder (1) is provided with a scale (102), the top of the cylinder (1) is fixedly connected to a needle seat (2), the inside of the cylinder (1) is slidably connected to a soft piston (303), the bottom of the soft piston (303) is fixedly connected to a connecting piece (302), the bottom of the connecting piece (302) is fixedly connected to a piston rod (301), the bottom of the piston rod (301) is fixedly connected to a push plate (3), the right side of the front side of the piston rod (301) is provided with a negative pressure area (306), the left side of the front side of the piston rod (301) is provided with a positioning area (310), the left and right sides of the rear side of the piston rod (301) are provided with an active area (308), the upper right side of the front end of the piston rod (301) is fixedly connected to A second baffle (305) is longitudinally distributed and fixedly connected to a first baffle (304) in a positioning area (310) on the right side of the front side of the piston rod (301); a first groove (307) is provided at the top of the lower right side of the piston rod (301); a second groove (309) is provided at the top of the lower left side of the piston rod (301); an adhesive layer (403) is adhered to the middle below the front end surface of the cylinder (1); an arc-shaped fixing plate (4) is adhered to the front end surface of the adhesive layer (403); a pull ring (401) is fixedly connected to the front end surface of the arc-shaped fixing plate (4); an insert block (402) is fixedly connected to the rear end surface of the arc-shaped fixing plate (4); a rubber ring (404) is fixedly connected to the outer side of the insert block (402); and a through groove (103) is provided in the middle below the front end surface of the cylinder (1).

2. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The outer edge of the connecting piece (302) contacts the inner wall of the cylinder (1), the middle of the lower front side of the cylinder (1) is fixedly connected to the outer front side of the plug block (402), and the upper and lower sides of the rubber ring (404) and the plug block (402) are in contact with the first blocking piece (304) and the second blocking piece (305).

3. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The internal capacity of the cylinder (1) is 20 milliliters, and the scale (102) on the front end surface of the cylinder (1) is longitudinally distributed at the front end of the cylinder (1) in units of 5 milliliters.

4. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: An internal thread is provided on one side of the needle seat (2) close to the liquid outlet end (101), and the distance between the needle seat (2) and the liquid outlet end (101) is one centimeter.

5. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The length of the piston rod (301) matches the length of the inner wall of the cylinder (1), and a circulation groove (103) is provided at the top of the front upper side of the piston rod (301), and the circulation groove (103) is used for circulation of the positioning area (310) and the movable area (308) of the piston rod (301).

6. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The first baffle (304) is arranged in the positioning area (310) of the piston rod (301), and the second baffle (305) is arranged in the negative pressure area (306) of the piston rod (301). The number of the first baffles (304) is four, and the longitudinal distribution distance of the first baffles (304) matches the position of the scale (102) on the outer side of the cylinder (1) with every five milliliters as one unit.

7. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The shapes of the second baffle (305) and the second baffle (305) are both triangles with an arc at the top, and the position of the second baffle (305) is parallel to the position of the first baffle (304) at the top of the positioning area (310).

8. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The first groove (307) of the piston rod (301) is arranged at a position close to the cylinder (1) on the right rear side below the negative pressure zone (306), and the second groove (309) of the piston rod (301) is arranged at a position close to the cylinder (1) on the left rear side below the positioning zone (310), and the upper and lower heights of the first groove (307) and the second groove (309) are 1.5 times the upper and lower heights of the insert (402).

9. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The longitudinal section shape of the through groove (103) in the middle of the lower front side of the cylinder (1) matches the longitudinal section shape of the plug (402), and the distance between the top of the plug (402) and the top of the inner side of the piston rod (301) when the plug (402) enters the cylinder (1) is half of the front-to-back length of the plug (402).

10. A negative pressure needle tube with a limiting structure and sustainable negative pressure according to claim 1, Features: The inner curvature of the arc-shaped fixing plate (4) matches the surface curvature of the cylinder (1), and the arc-shaped fixing plate (4) and the cylinder (1) are bonded together by an adhesive layer (403). The number of the rubber rings (404) is two, and the rubber rings (404) are distributed on the front and rear sides of the outer side of the plug (402).

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