Strong negative pressure injector

Abstract

The utility model relates to a strong negative pressure injector which comprises a needle cylinder, the interior of the needle cylinder is hollow, one end of the needle cylinder is a needle head end, the other end of the needle cylinder is a supporting end, and the outer wall of the supporting end extends outwards to form a supporting wing; the piston rod comprises a push rod, one end of the push rod is provided with a piston head in sealing fit with the interior of the needle cylinder, the other end of the push rod is provided with a pressing piece, and the side wall of the push rod is provided with a first limiting piece; the second limiting piece is installed on the supporting wing and can be matched with the first limiting piece to lock the piston rod on the needle cylinder. The device has the beneficial effects of simplicity in operation, high stability, convenience in function switching and the like.

Description

Technical Field

[0001] The utility model relates to a syringe, in particular to a strong negative pressure syringe, belonging to the technical field of medical equipment. Background Art

[0002] A syringe is a common medical device that uses a needle to extract or inject gases or liquids. During clinical procedures, doctors often need to maintain a certain negative pressure in the syringe to complete certain surgeries or procedures. However, if the liquid is thick or the amount is large, the operation is very time-consuming and tiring, and the finger strength is insufficient to maintain the negative pressure in the syringe for a long time.

[0003] For example, a "plug-in negative pressure limiter for syringes" disclosed in Chinese patent literature, with publication number CN210813179U, includes a chuck and a limit pin holder. The chuck is provided with a U-shaped groove that matches the outer wall of the syringe, and a slot for accommodating the wing on the syringe is provided in the U-shaped groove. Two guide flaps for guiding the push rod on the syringe are provided on one side of the slot. A limit pin hole is provided on the outside of the two guide flaps in the U-shaped groove. The limit pin holder includes a connected limit seat and a limit pin. The limit pin is movably inserted in the limit pin hole and can be inserted into the limit hole of the push rod. This plug-in negative pressure limiter can limit the push rod of the syringe by limiting its insertion through the limit pin holder, thereby limiting the push rod relative to the syringe.

[0004] Based on the search of the above patents and in combination with the equipment in the prior art, the above equipment still has the following defects: 1. The aperture of the limit hole is generally small. During actual operation, the limit pin may not be easily inserted into the limit hole, resulting in an unstable negative pressure state; 2. When the piston rod is pulled to the appropriate position and negative pressure needs to be maintained, it often requires both hands or two people to cooperate to accurately align the limit pin with the limit hole, which is cumbersome to operate. Utility Model Content

[0005] The utility model mainly aims at solving the above problems in the prior art and provides a strong negative pressure syringe.

[0006] The purpose of this utility model is mainly achieved through the following solutions:

[0007] A strong negative pressure syringe comprises: a syringe, the interior of which is hollow, with one end being a needle end and the other end being a support end, the outer wall of the support end extending outward to form a support wing; a piston rod, the piston rod comprising a push rod, one end of which is provided with a piston head that seals with the interior of the syringe, the other end of which is provided with a pressing piece, and the side wall of the push rod is provided with a first limiter; a second limiter, which is mounted on the support wing and can cooperate with the first limiter to lock the piston rod on the syringe.

[0008] Preferably, the side wall of the push rod is provided with four reinforcing ribs uniformly along the circumference of its axis, and the transverse section of the push rod forms a cross shape.

[0009] Preferably, the first limiting member is a latching tooth, and is provided on one of the reinforcing ribs, and a plurality of latching teeth are evenly provided along the length direction of the reinforcing rib.

[0010] Preferably, the second limiting member is a half-moon-shaped retaining piece, and a first column head and a second column head are symmetrically provided on a side of the retaining piece opposite to the supporting wing.

[0011] Preferably, the support wing is symmetrically provided with extension parts on the left and right sides, and the middle parts of the left and right extension parts are respectively provided with a first through hole and a second through hole, and the line between the first through hole and the second through hole passes through the center of the support end of the syringe.

[0012] Preferably, a first concave point is further provided on the right extending portion, and the first concave point is located above the second through hole.

[0013] Preferably, the first column head of the locking piece is rotatably connected to the first through hole, and in the process of the locking piece rotating along the first through hole through the first column head, the second column head will pass through the first concave point and the second through hole, and the right extension part is provided with an arc-shaped sliding groove for connecting the first concave point and the second through hole, and the arc-shaped sliding groove is consistent with the movement trajectory of the second column head.

[0014] Preferably, the depth of the sliding groove is less than the depth of the first concave point.

[0015] Preferably, a locking groove for cooperating with the locking teeth is provided at the center of the inner edge of the locking piece.

[0016] Preferably, a paddle is provided on the outer edge of the locking piece.

[0017] Therefore, compared with the prior art, the present invention has the following advantages:

[0018] (1) The push rod, reinforcing ribs, latching teeth and latching pieces provided in the present invention can play the role of limiting the push rod relative to the syringe through the cooperation between the latching teeth and the latching piece, and can also prevent the push rod from rotating and dislocating, so that the syringe is always in a strong negative pressure holding state without human intervention, and has good stability;

[0019] (2) The present invention provides a first column head, a second column head on the locking plate, and a first through hole, a second through hole, a first concave point and a sliding groove on the extension portion, so that the syringe can be used as both an ordinary syringe and a strong negative pressure suction syringe. When used as an ordinary syringe, the locking plate is pushed outward, and the second column head slides into the first concave point. When used as a strong negative pressure suction syringe, it is only necessary to pull out the piston rod to a specified position, press the locking plate inward, and slide the second column head into the second through hole. The locking groove of the locking plate is locked in the locking teeth, which can prevent the piston rod from rebounding, so that the syringe always maintains a strong negative pressure state, which is convenient for switching and flexible in use.

[0020] (3) The utility model is easy to operate, and the negative pressure maintaining operation can be completed by one person with one hand. It also has a simple structure and low cost, and is suitable for mass production and large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a structural diagram of the second limiting member in the utility model;

[0025] Figure 5 This is a schematic diagram of the utility model in use as a common syringe;

[0026] Figure 6 This is a schematic diagram of the utility model in use when used for strong negative pressure suction.

[0027] Illustrations: 1-syringe, 2-needle end, 3-support end, 4-support wing, 5-piston rod, 6-push rod, 7-piston head, 8-pressing plate, 9-first limiting member, 10-reinforcement rib, 11-locking plate, 12-first column head, 13-second column head, 14-extension part, 15-first through hole, 16-second through hole, 17-first concave point, 18-sliding groove, 19-locking groove, 20-paddle. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the technical solution of the present invention through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any form of modification and / or change made to the present invention will fall within the scope of protection of the present invention.

[0029] In this utility model, unless otherwise specified, all parts and percentages are by weight. The equipment and raw materials used are commercially available or commonly used in the art. The methods in the following embodiments, unless otherwise specified, are conventional methods in the art. The components or equipment in the following embodiments, unless otherwise specified, are all common standard parts or components known to those skilled in the art. Their structures and principles are known to those skilled in the art through technical manuals or routine experimental methods.

[0030] Example 1:

[0031] like Figure 1 、 2 As shown, the utility model provides a technical solution, a strong negative pressure syringe, which consists of a syringe 1, a piston rod 5, a first limiter 9 and a second limiter. The first limiter 9 and the second limiter are used in conjunction to lock the piston rod 5 in the corresponding position of the syringe 1, thereby achieving negative pressure maintenance.

[0032] Specifically, the interior of the syringe 1 is hollow, and one end is the needle end 2, and the other end is the support end 3, and the outer wall of the support end 3 extends outward to form an integral support wing 4. In addition, the surface of the syringe 1 is provided with at least 10cc, 20cc, 30cc, 40cc, 50cc, and 60cc scale lines to facilitate accurate alignment.

[0033] Specifically, the piston rod 5 includes a push rod 6, one end of which is provided with a piston head 7 that seals with the inside of the syringe 1, the other end of the push rod 6 is integrally provided with a pressing piece 8, and the side wall of the push rod 6 is also provided with a first limiter 9.

[0034] Specifically, the second limiting member is installed on the supporting wing 4 and can cooperate with the first limiting member 9 to lock the piston rod 5 on the syringe 1.

[0035] Example 2:

[0036] like Figure 1 、 2 As shown, the present invention provides a technical solution, a strong negative pressure syringe, which is different from Example 1 in that the side wall of the push rod 6 is provided with four reinforcing ribs 10 evenly circumferentially along its axis, and the transverse section of the push rod 6 forms a cross shape.

[0037] Specifically, the first limit member 9 adopts a U-shaped or V-shaped structure of the latch tooth, and is opened on one of the reinforcing ribs 10. There are multiple latch teeth evenly arranged along the length direction of the reinforcing rib 10. During actual use, the position of the push rod 6 can be rotated so that the opening of the latch tooth faces the second limit member, which is convenient for later operation.

[0038] like Figure 4As shown, the second limiting member is a half-moon-shaped locking piece 11 , and a first column head 12 and a second column head 13 are symmetrically provided on one side of the locking piece 11 opposite to the supporting wing 4 .

[0039] like Figure 3 As shown, symmetrical extension parts 14 are integrally provided on the left and right sides of the support wing 4, and a first through hole 15 and a second through hole 16 are respectively provided in the middle of the left and right extension parts 14, and the connecting line between the first through hole 15 and the second through hole 16 passes through the center of the support end 3 of the syringe 1.

[0040] Specifically, a first concave point 17 is further provided on the right extending portion 14 , and the first concave point 17 is located above the second through hole 16 .

[0041] Specifically, the first column head 12 of the locking piece 11 is rotatably connected to the first through hole 15, and the end of the first column head 12 should be provided with a limiting end with a diameter larger than the first column head 12 to prevent the first column head 12 from slipping from the first through hole 15 during use. The locking piece 11 rotates with the first column head 12 as a fulcrum. In the process of the locking piece 11 rotating along the first through hole 15 through the first column head 12, the second column head 13 will pass through the first recess 17 and the second through hole 16. The sizes of the first recess 17 and the second through hole 16 are adapted to the second column head 13. In addition, the extension portion 14 on the right side is provided with an arc-shaped sliding groove 18 for connecting the first recess 17 and the second through hole 16. The arc-shaped sliding groove 18 is consistent with the movement trajectory of the second column head 13, and the depth of the sliding groove 18 is less than the depth of the first recess 17.

[0042] The first concave point 17 and the second through hole 16 can make the locking piece 11 stable in two states. When it is in the first concave point 17 , it can be used as a common syringe. When it is in the second through hole 16 , it can be used as a strong negative pressure syringe.

[0043] Example 3:

[0044] like Figure 1 、 3 As shown, the utility model provides a technical solution, a strong negative pressure syringe, which is different from Example 1 in that a locking groove 19 for use with a locking tooth is provided at the center position of the inner edge of the above-mentioned locking piece 11, and the locking groove 19 can perfectly fit with the locking tooth of the push rod 6.

[0045] Specifically, the outer edge of the locking piece 11 is further integrally provided with a paddle 20 facing the barrel 1 . The arrangement of the paddle 20 facilitates manual movement of the locking piece 11 .

[0046] like Figure 5 、 6As shown, when the syringe is used for strong negative pressure, the piston rod 5 is pulled outward and pulled to the target negative pressure scale line, the locking piece 11 is pressed inward, and the second column head 13 slides into the second through hole 16. The reverse force of the push rod 6 acts on the locking piece 11. The locking piece 11 relies on the support wing 4 of the syringe, which is stable and reliable. The second column head 13 slides into the second through hole 16 and will not slip. During the operation, the locking piece 11 can be switched at any time when holding the syringe 1 by hand, without having to use the other hand or multiple people to operate, and the operation is simple.

[0047] The utility model provides a strong negative pressure syringe, which can play the role of limiting the push rod relative to the syringe barrel through the push rod, reinforcing ribs, latching teeth and latching pieces, and can avoid the push rod from rotating and misaligning, so that the syringe is always in a strong negative pressure maintaining state without human intervention, and has good stability; through the first column head and the second column head provided on the latching piece, and the first through hole, the second through hole, the first concave point and the sliding groove on the extension part, the syringe can be used as an ordinary syringe. It can also be used for strong negative pressure suction. When used as an ordinary syringe, the locking piece is pushed outward and the second column head slides into the first concave point. When used for strong negative pressure suction, it is only necessary to pull out the piston rod to the specified position, press the locking piece inward, and the second column head slides into the second through hole. The locking groove of the locking piece is stuck in the locking tooth, which can prevent the piston rod from rebounding, so that the syringe always maintains a strong negative pressure state, which is convenient for switching and flexible in use. The utility model is easy to operate, and the negative pressure maintaining operation can be completed by one person with one hand. It has a simple structure and low cost, and is suitable for mass production and large-scale promotion and use.

[0048] It should be understood that the embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A strong negative pressure syringe, characterized in that: The syringe includes: A syringe (1), wherein the interior of the syringe (1) is hollow, and one end is a needle end (2), and the other end is a support end (3), and the outer wall of the support end (3) extends outward to form a support wing (4); A piston rod (5), the piston rod (5) comprising a push rod (6), one end of the push rod (6) being provided with a piston head (7) that seals with the interior of the syringe (1), the other end of the push rod (6) being provided with a pressing piece (8), and a side wall of the push rod (6) being provided with a first stopper (9); A second limiting member is mounted on the support wing (4) and can cooperate with the first limiting member (9) to lock the piston rod (5) on the syringe (1).

2. A strong negative pressure syringe according to claim 1, characterized in that: The side wall of the push rod (6) is provided with four reinforcing ribs (10) along the even circumference of its axis, and the transverse section of the push rod (6) forms a cross shape.

3. A strong negative pressure syringe according to claim 2, characterized in that: The first limiting member (9) is in the form of a latching tooth and is arranged on one of the reinforcing ribs (10). A plurality of latching teeth are evenly arranged along the length direction of the reinforcing rib (10).

4. A strong negative pressure syringe according to claim 3, characterized in that: The second limiting member adopts a half-moon-shaped locking piece (11), and a first column head (12) and a second column head (13) are symmetrically provided on a side of the locking piece (11) opposite to the supporting wing (4).

5. A strong negative pressure syringe according to claim 4, characterized in that: Extension portions (14) are symmetrically provided on the left and right sides of the support wing (4), and a first through hole (15) and a second through hole (16) are respectively provided in the middle of the left and right extension portions (14), and a line connecting the first through hole (15) and the second through hole (16) passes through the center of the support end (3) of the syringe (1).

6. A strong negative pressure syringe according to claim 5, characterized in that: A first concave point (17) is also provided on the right extension portion (14), and the first concave point (17) is located above the second through hole (16).

7. A strong negative pressure syringe according to claim 6, characterized in that: The first column head (12) of the locking piece (11) is rotatably connected to the first through hole (15), and in the process of the locking piece (11) rotating along the first through hole (15) through the first column head (12), the second column head (13) passes through the first concave point (17) and the second through hole (16), and the right extension portion (14) is provided with an arc-shaped sliding groove (18) for connecting the first concave point (17) and the second through hole (16), and the arc-shaped sliding groove (18) is consistent with the movement trajectory of the second column head (13).

8. A strong negative pressure syringe according to claim 7, characterized in that: The depth of the sliding groove (18) is smaller than the depth of the first concave point (17).

9. A strong negative pressure syringe according to claim 4, characterized in that: A locking groove (19) for use with the locking teeth is provided at the center of the inner edge of the locking piece (11).

10. A strong negative pressure syringe according to claim 9, characterized in that: The outer edge of the locking piece (11) is provided with a paddle (20).

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