Skin test medicine dispenser

Abstract

The utility model discloses a skin test medicine dispenser relates to the field of medical devices. Including needle cylinder, piston and needle, piston inserts in needle cylinder, and needle is connected in the front of needle cylinder, including limit structure, and limit structure can limit the movement of piston, and when piston moves to limit position backward, the volume of skin test medicine dispenser is a, and when piston moves to limit position forward, the volume of skin test medicine dispenser is a / 10, and the limit of limit structure to piston movement can be removed. The utility model adds the limit structure, when preparing the skin test medicine, does not need to see the scale on the skin test injector one time after another, has saved the time of preparing the skin test solution, simultaneously, has reduced the probability that the operator uses the naked eye to see the scale line and is easy to cause the error of judgment, has improved the accuracy of dispensing.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a skin test drug dispensing device. Background Technology

[0002] Skin test drugs primarily refer to a class of medications that require a skin allergy test before application. To prevent allergic reactions, especially severe ones, regulations stipulate that certain medications prone to causing allergic reactions require a skin sensitivity test before use. Medications with a negative skin test can be given to patients, while those with a positive test are prohibited. The Chinese Pharmacopoeia's "Clinical Drug Use Guidelines" specifies that many medications require skin testing, such as common penicillin sodium injections, penicillin potassium injections, penicillin V potassium tablets, and tetanus antitoxin injections. To ensure medication safety, meet testing requirements, and satisfy drug characteristics, these skin test drugs must be diluted before being given to patients.

[0003] Taking the preparation of penicillin skin test solution as an example, the existing preparation process is as follows:

[0004] Step 1: Use a 5mL syringe to draw 4mL of 0.9% NaCl solution and inject it into the penicillin bottle (1.6 million penicillin units / bottle) to fully dissolve the penicillin and obtain a penicillin solution of 400,000 units / ml.

[0005] Step 2: Draw 0.1 mL of penicillin solution with a 1 mL syringe, and then draw 0.9 mL of 0.9% NaCl solution. Shake well to obtain a penicillin solution with a concentration of 40,000 units / mL.

[0006] Third, discard 0.9 mL of penicillin solution, leaving 0.1 mL, and draw 0.9 mL of 0.9% NaCl solution again, shake well to obtain a penicillin solution with a concentration of 4,000 units / mL.

[0007] Fourth step: Discard 0.9 mL of penicillin solution, leaving 0.1 mL, and draw 0.9 mL of 0.9% NaCl solution again, shake thoroughly to obtain a penicillin solution of 400 units / mL.

[0008] Fifth, leave 0.1 mL of penicillin solution for a skin test and observe for 15-20 minutes.

[0009] Therefore, there are some drawbacks in preparing skin test solutions. First, because penicillin solution requires multiple dilutions and involves many steps, operators need to repeatedly check the markings on the syringe, which is inconvenient. Second, the operator's observation angle can affect judgment, and slight carelessness can easily lead to over-pumping or over-drawing of the solution, resulting in inaccurate skin test concentrations. Utility Model Content

[0010] The technical problem to be solved by this utility model is to provide a skin test drug preparation device that can accurately and quickly prepare skin test drugs.

[0011] The technical solution adopted by this utility model is as follows: the skin test drug preparation device includes a syringe, a piston, and a needle; the piston is inserted into the syringe, and the needle is connected to the front of the syringe; it also includes a limiting structure, which can restrict the movement of the piston. When the piston moves backward to the limit position, the volume of the skin test drug preparation device is a; when the piston moves forward to the limit position, the volume of the skin test drug preparation device is a / 10; the limitation of the piston movement by the limiting structure can be released.

[0012] Furthermore, a = 1 mL.

[0013] Furthermore: the piston has a limiting groove; the limiting structure includes a protrusion, a limiting rod, and a spring; the protrusion is disposed on the outer wall of the syringe; the limiting rod includes a rod body and a pressing head, one end of the rod body extends into the protrusion along the radial direction of the syringe, and the other end of the rod body is located outside the protrusion and connected to the pressing head; the spring is fitted on the rod body and located between the protrusion and the pressing head, and the two ends of the spring are connected to the protrusion and the pressing head respectively;

[0014] When the rod moves inward to the point of entering the limiting groove, the limiting structure restricts the piston movement; when the front wall of the limiting groove contacts the rod, the volume of the skin test drug dispenser is a; when the rear wall of the limiting groove contacts the rod, the volume of the skin test drug dispenser is a / 10; when the rod moves outward to exit the limiting groove, the limiting structure releases the restriction on the piston movement.

[0015] Furthermore, the limiting groove is opened along the circumference of the piston.

[0016] Furthermore, the spring is connected to the protrusion and the pressing head by adhesive bonding.

[0017] Furthermore: a positioning hole with a notch is provided on the flange at the rear end of the syringe; the limiting structure includes a positioning rod and a positioning pin; the positioning rod is located next to the syringe and is arranged in the same direction as the syringe, one end of the positioning rod passes through the positioning hole and is connected to the end plate of the piston, and the other end of the positioning rod extends radially towards the outer wall of the syringe to form a positioning part; the positioning pin is inserted into the positioning rod and can move; when the positioning pin moves to one side protruding from the positioning rod, the positioning pin can pass through the notch; when the positioning pin moves to the other side protruding from the positioning rod, the positioning pin cannot pass through the positioning hole; when the positioning part is in contact with the front surface of the flange, the volume of the skin test drug dispenser is a / 10; when the positioning pin is in contact with the rear surface of the flange, the volume of the skin test drug dispenser is a / 10.

[0018] Furthermore, the locating pin and the hole on the locating rod where the locating pin is inserted are interference-fitted.

[0019] The beneficial effects of this invention are as follows: Taking the preparation of penicillin skin test solution, a = 1 mL as an example, this invention replaces the 1 mL syringe described in the background art for steps two to five of the skin test solution preparation process described in the background art. Specifically, in step two: the limiting structure restricts the piston movement, and the piston is pushed to the front end of the syringe; then 0.1 mL of penicillin solution is drawn, and the amount of solution drawn is determined by observing the syringe scale; then a small portion of a 0.9% NaCl solution is drawn, and the piston movement is restricted by the limiting structure, and then the 0.9% NaCl solution is drawn. At this time, due to the effect of the limiting structure, it is no longer necessary to observe the syringe scale, and the piston can be moved directly to the limit position. In steps three and four: the piston is pushed and pulled in steps three and four according to the existing technology, and the piston is pushed and pulled to the limit position without observing the syringe scale. In step five: the piston is pushed to the limit position, leaving 0.1 mL of penicillin solution for the skin test, and it is also not necessary to observe the syringe scale.

[0020] As can be seen, when using this invention to prepare skin test solutions, due to the limiting effect of the limiting structure 4, when the piston is pulled to its limit, the skin test solution dispenser draws in exactly 1 mL of solution; when the piston 2 is pulled to its limit, the skin test solution dispenser retains exactly 0.1 mL of solution. This eliminates the need to constantly check the scale on syringe 1. This not only facilitates skin test solution preparation and shortens the preparation time, but also avoids potential errors caused by operators visually checking the scale lines, thus improving the accuracy of the solution preparation. Attached Figure Description

[0021] Figure 1 A schematic diagram of the external structure of a skin test drug dispenser with the first type of limiting structure;

[0022] Figure 2 for Figure 1 A sectional view;

[0023] Figure 3 This is a structural diagram of the first type of limiting structure in the unlimited state;

[0024] Figure 4 This is an enlarged view of the limiting structure when the piston moves forward to its limit position in the first type of limiting structure.

[0025] Figure 5 This is an enlarged view of the limiting structure when the piston of the first type of limiting structure moves backward to its extreme position.

[0026] Figure 6 This is a structural diagram of the second type of limiting structure in the unlimited state;

[0027] Figure 7 for Figure 6 Top view of the center flange;

[0028] Figure 8 This is a diagram showing the usage state of the piston when it moves forward to its limit position in the second type of limiting structure.

[0029] Figure 9 This is a diagram showing the usage state of the piston when it moves backward to its limit position in the second type of limiting structure.

[0030] Reference numerals: 1. Syringe, 11. Flange, 111. Positioning hole, 1111. Notch, 2. Piston, 21. Limiting groove, 22. End plate, 3. Needle, 4. Limiting structure, 41. Protrusion, 42. Limiting rod, 421. Rod body, 422. Pressing head, 43. Spring, 44. Positioning rod, 441. Positioning part, 45. Positioning pin, 5. Scale line. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-9 This utility model will be described in detail.

[0032] The skin test drug preparation device includes a syringe 1, a piston 2, and a needle 3; the piston 2 is inserted into the syringe 1, and the needle 3 is connected to the front of the syringe 1; it also includes a limiting structure 4, which can restrict the movement of the piston 2. When the piston 2 moves backward to its limit position, the volume of the skin test drug preparation device is a; when the piston 2 moves forward to its limit position, the volume of the skin test drug preparation device is a / 10; the limitation of the piston 2 movement by the limiting structure 4 can be released.

[0033] Currently, 1mL syringes are generally used for preparing skin test medications, and the volume of medication drawn during the preparation process is 1mL. Therefore, a = 1mL is preferred. The syringe 1, as in existing technology, has graduations 5.

[0034] Taking the preparation of penicillin skin test solution as an example, this invention replaces the 1mL syringe described in the background art, performing steps two through five of the skin test solution preparation process described in the background art. Specifically, in step two: the limiting structure 4 is released from restricting the movement of piston 2, and piston 2 is pushed to the front end of syringe 1; then 0.1mL of penicillin solution is drawn, and the amount of solution drawn is determined by observing the scale line 5 on syringe 1; then a small portion of 0.9% NaCl solution is drawn, and then the limiting structure 4 is used to restrict the movement of piston 2, and then the 0.9% NaCl solution is drawn again. At this time, due to the effect of the limiting structure 4, it is no longer necessary to observe the scale line 5 on syringe 1, and piston 2 can be moved directly to the limit position. In steps three and four: piston 2 is pushed and pulled to the limit position in steps three and four according to the prior art, and it is no longer necessary to observe the scale line 5 on syringe 1. In step five: piston 2 is pushed to the limit position, leaving 0.1mL of penicillin solution for skin test, and it is also no longer necessary to observe the scale line 5 on syringe 1.

[0035] As can be seen, when using this invention to prepare skin test solutions, due to the limiting effect of the limiting structure 4, when the piston 2 is pulled to its limit position, the skin test solution dispenser draws in exactly 1 mL of solution; when the piston 2 is pulled to its limit position, the skin test solution dispenser retains exactly 0.1 mL of solution. This eliminates the need to constantly check the scale on the syringe 1. This not only facilitates the preparation of skin test solutions and shortens the preparation time, but also avoids the judgment errors that may occur when operators visually check the scale lines, thus improving the accuracy of the preparation.

[0036] The specific structure of the limiting structure 4 can be as follows: Figures 1 to 5 As shown, the piston 2 has a limiting groove 21; the limiting structure 4 includes a protrusion 41, a limiting rod 42, and a spring 43; the protrusion 41 is disposed on the outer wall of the syringe 1; the limiting rod 42 includes a rod body 421 and a pressing head 422, one end of the rod body 421 extends into the protrusion 41 in the radial direction of the syringe 1, and the other end of the rod body 421 is located outside the protrusion 41 and connected to the pressing head 422; the spring 43 is fitted on the rod body 421 and is located between the protrusion 41 and the pressing head 422. The two ends of the spring 43 are connected to the protrusion 41 and the pressing head 422 respectively; when the rod 421 moves inward to extend into the limiting groove 21, the limiting structure 4 restricts the movement of the piston 2; when the front wall of the limiting groove 21 contacts the rod 421, the volume of the skin test drug dispenser is a; when the rear wall of the limiting groove 21 contacts the rod 421, the volume of the skin test drug dispenser is a / 10; when the rod 421 moves outward to exit the limiting groove 21, the limitation of the limiting structure 4 on the movement of the piston 2 is released.

[0037] Due to the action of spring 43, when the limiting rod 42 is not pressed, the rod 42 exits the limiting groove 21, and the limiting structure 4 has no limiting function. When the fingers of the hand holding the syringe 1 press the limiting rod 42, the spring 43 is compressed, and the limiting rod 42 can extend into the limiting groove 21 to limit the movement of the piston 2.

[0038] The protrusion 41 and the syringe 1 are preferably integrally formed. Since the piston 2 may rotate inside the syringe 1, the limiting rod 42 is preferably positioned along the circumference of the piston 2 so that it can also be inserted into the limiting groove 21 when the piston 2 rotates. The spring 43 can be connected to the protrusion 41 and the pressing head 422 using existing connection methods such as adhesive bonding.

[0039] The specific structure of the limiting structure 4 can be as follows: Figures 6 to 9As shown, a positioning hole 111 is provided on the flange 11 at the rear end of the syringe 1, and the positioning hole 111 has a notch 1111; the limiting structure 4 includes a positioning rod 44 and a positioning pin 45; the positioning rod 44 is located next to the syringe 1 and is arranged in the same direction as the syringe 1, one end of the positioning rod 44 passes through the positioning hole 111 and is connected to the end plate 22 of the piston 2, and the other end of the positioning rod 44 extends radially towards the outer wall of the syringe 1 to form a positioning part 441; the positioning pin 45 is inserted into the positioning rod 44 and can move; when the positioning pin 45 moves to the side protruding from the positioning rod 44, the positioning pin 45 can pass through the notch 1111; when the positioning pin 45 moves to the other side protruding from the positioning rod 44, the positioning pin 45 cannot pass through the positioning hole 111; when the positioning part is in contact with the front surface of the flange 11, the volume of the skin test drug dispenser is a / 10; when the positioning pin 45 is in contact with the rear surface of the flange 11, the volume of the skin test drug dispenser is a / 10.

[0040] The fit between the positioning pin 45 and the hole on the positioning rod 44 into which the positioning pin 45 is inserted should be a small interference fit, so that the positioning pin 45 will not move easily, but can be moved by pressing.

[0041] In terms of specific operation: In the initial state, the positioning pin 45 protrudes from one side of the positioning rod 44, and the direction of the protrusion is consistent with the direction of the notch 1111. Therefore, the positioning pin 45 can pass through the notch 1111 without any limit. After the positioning pin 45 moves to the rear of the end plate 22 through the positioning hole 111, pressing the positioning pin 45 makes it protrude from the other side of the positioning rod 44. At this time, the positioning pin 45 can no longer pass through the positioning hole 111, so the positioning pin 45 can be limited. After the skin test drug is prepared, pressing the positioning pin 45 returns it to the initial state to release the limitation, and the prepared skin test drug can be injected.

Claims

1. A skin test drug preparation device, comprising a syringe (1), a piston (2), and a needle (3); the piston (2) is inserted into the syringe (1), and the needle (3) is connected to the front of the syringe (1); characterized in that: Includes a limiting structure (4), which can restrict the movement of piston (2). When piston (2) moves backward to the limit position, the volume of skin test drug dispenser is a; when piston (2) moves forward to the limit position, the volume of skin test drug dispenser is a / 10; the limitation of piston (2) on movement of piston (2) by limiting structure (4) can be released.

2. The skin test drug preparation device according to claim 1, characterized in that: a = 1 mL.

3. The skin test drug dispensing device according to claim 1 or 2, characterized in that: The piston (2) has a limiting groove (21); the limiting structure (4) includes a protrusion (41), a limiting rod (42) and a spring (43); the protrusion (41) is set on the outer wall of the syringe (1); the limiting rod (42) includes a rod body (421) and a pressing head (422), one end of the rod body (421) extends into the protrusion (41) along the radial direction of the syringe (1), and the other end of the rod body (421) is located outside the protrusion (41) and connected to the pressing head (422); the spring (43) is fitted on the rod body (421) and located between the protrusion (41) and the pressing head (422), and the two ends of the spring (43) are connected to the protrusion (41) and the pressing head (422) respectively; When the rod (421) moves inward to the limit groove (21), the limiting structure (4) restricts the movement of the piston (2); when the front wall of the limit groove (21) contacts the rod (421), the volume of the skin test drug dispenser is a; when the rear wall of the limit groove (21) contacts the rod (421), the volume of the skin test drug dispenser is a / 10; when the rod (421) moves outward to exit the limit groove (21), the limitation of the limiting structure (4) on the movement of the piston (2) is released.

4. The skin test drug preparation device according to claim 3, characterized in that: The limiting groove (21) is opened along the circumference of the piston (2).

5. The skin test drug preparation device according to claim 4, characterized in that: The spring (43) is connected to the protrusion (41) and the pressing head (422) by adhesive bonding.

6. The skin test drug dispensing device according to claim 1 or 2, characterized in that: A positioning hole (111) is provided on the flange (11) at the rear end of the syringe (1), and the positioning hole (111) has a notch (1111); the limiting structure (4) includes a positioning rod (44) and a positioning pin (45); the positioning rod (44) is located next to the syringe (1) and is arranged in the same direction as the syringe (1), one end of the positioning rod (44) passes through the positioning hole (111) and is connected to the end plate (22) of the piston (2), and the other end of the positioning rod (44) extends along the radial direction of the syringe (1) toward the outer wall of the syringe (1) to form a positioning part (441); the positioning pin (45) Insert the positioning rod (44) and be able to move; when the positioning pin (45) moves to one side of the protruding positioning rod (44), the positioning pin (45) can pass through the notch (1111); when the positioning pin (45) moves to the other side of the protruding positioning rod (44), the positioning pin (45) cannot pass through the positioning hole (111); when the positioning part (441) is in contact with the front surface of the flange (11), the volume of the skin test drug dispenser is a / 10; when the positioning pin (45) is in contact with the rear surface of the flange (11), the volume of the skin test drug dispenser is a / 10.

7. The skin test drug preparation device according to claim 6, characterized in that: The positioning pin (45) and the positioning rod (44) are interference-fitted through the hole into which the positioning pin (45) is inserted.

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