CN219921564U - Hollow needle with filtering function - Google Patents
Hollow needle with filtering function Download PDFInfo
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- CN219921564U CN219921564U CN202321156543.3U CN202321156543U CN219921564U CN 219921564 U CN219921564 U CN 219921564U CN 202321156543 U CN202321156543 U CN 202321156543U CN 219921564 U CN219921564 U CN 219921564U
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- liquid
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- 238000001914 filtration Methods 0.000 title claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 114
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 33
- 241001411320 Eriogonum inflatum Species 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The utility model discloses an empty needle with a filtering function, belongs to the field of medical instruments, and aims to solve the problem of how to prevent foreign matters from entering a liquid bag or a patient body along with liquid medicine. The hollow needle is provided with a first channel serving as a liquid inlet channel and a second channel serving as a liquid outlet channel in the closed end, a filtering device is arranged on the second channel, and a switching mechanism is also arranged in the closed end; when a nurse sucks the liquid medicine by using the hollow needle, the liquid inlet and outlet channel is communicated with the first channel through the switching mechanism, so that the smooth suction of the liquid medicine can be ensured; when a nurse uses the hollow needle to inject the liquid medicine, the liquid inlet and outlet channel is communicated with the second channel through the switching mechanism, so that the liquid medicine can be ensured to be successfully pushed into the liquid bag or the patient after being dissolved, and the filtering device on the second channel can filter foreign matters such as bottle stopper scraps and the like sucked into the hollow needle in the sucking process, so that the foreign matters are prevented from entering the liquid bag or the patient along with the liquid medicine, the safety of the patient is ensured, and the contradiction between doctors and patients is reduced.
Description
Technical Field
The utility model belongs to the field of medical instruments, and particularly relates to an empty needle with a filtering function.
Background
Empty needles generally refer to needled syringes without a medical fluid therein, which generally include a syringe barrel, a plunger movably disposed within the syringe barrel, and a needle detachably disposed on a nozzle of the syringe barrel. If the nurse selects the empty needle with smaller needle diameter to suck the liquid medicine, the resistance is large, and the hand muscle or joint strain is easy to be caused. If the hollow needle with larger needle diameter is selected, bottle stopper scraps are easy to generate when the bottle stopper is punctured. The bottle stopper scraps appear in the liquid infused by the patient, and can cause adverse effects on the body of the patient, thereby aggravating the contradiction between doctors and patients.
In order to prevent foreign matters such as bottle stopper scraps from entering the hollow needle and the human body, the hollow needle with the filtering function is invented. For example: the Chinese patent with publication number of CN202982803U discloses a hollow filtering needle, which comprises a piston cylinder, a piston and a filter screen, wherein the filter screen is arranged in the piston cylinder, and the filter screen is arranged at the front end in the piston cylinder.
The filter hollow needle is provided with the filter screen at the position where the front end in the piston cylinder is close to the liquid medicine inlet, and the liquid medicine is pumped into the hollow needle from the front end of the piston cylinder, so that the filter screen can block foreign matters outside the hollow needle, and the foreign matters cannot enter the hollow needle. However, since the above-mentioned hollow filtration needle is used for sucking and injecting the liquid medicine by using the same liquid medicine channel communicated with the needle, foreign matters blocked on the filtration net may enter the liquid bag or the patient body along with the liquid medicine during the injection of the liquid medicine.
Disclosure of Invention
The utility model provides an empty needle with a filtering function, which aims to solve the problem of how to prevent foreign matters from entering a liquid bag or a patient body along with liquid medicine.
The technical scheme adopted for solving the technical problems is as follows: the hollow needle with the filtering function comprises a syringe barrel, a piston and a filtering device;
the front end of the injector tube is a closed end, the closed end is provided with a needle connecting nozzle, a liquid inlet and outlet channel communicated with the needle connecting nozzle is arranged in the closed end, and a first channel communicated with the inner cavity of the injector tube is also arranged in the closed end;
the piston is arranged in the inner cavity of the syringe barrel and can move along the axial direction of the syringe barrel;
the closed end is also provided with a second channel communicated with the inner cavity of the syringe barrel; the first channel is a liquid inlet channel, the second channel is a liquid outlet channel, and the filtering device is arranged on the second channel;
the closed end is internally provided with a switching mechanism which can be used for communicating the liquid inlet and outlet channel with the first channel when the hollow needle is sucked and communicating the liquid inlet and outlet channel with the second channel when the hollow needle is injected.
Further, the syringe barrel is provided with graduation marks for representing the volume of the inner cavity of the syringe barrel.
Further, the piston includes a piston shaft, a piston body disposed at a front end of the piston shaft, and a piston handle disposed at a rear end of the piston shaft.
Further, the filtering device is a filter screen arranged at the liquid inlet of the second channel.
Further, the hollow needle also comprises a needle head detachably arranged on the needle connecting nozzle.
Further, the needle head comprises a needle bolt and a needle stem arranged on the needle bolt, and the front end of the needle stem is provided with a needle point.
Further, the switching mechanism comprises a first control valve for communicating the liquid inlet and outlet channel with the first channel and a second control valve for communicating the liquid inlet and outlet channel with the second channel;
the first control valve is in an open state and the second control valve is in a closed state when the empty needle is sucked, and the first control valve is in a closed state and the second control valve is in an open state when the empty needle is injected.
Further, the switching mechanism comprises a first one-way valve which communicates the liquid inlet and outlet channel with the first channel and a second one-way valve which communicates the liquid inlet and outlet channel with the second channel;
the first one-way valve only allows fluid to flow from the fluid inlet and outlet channel into the first channel, and the second one-way valve only allows fluid to flow from the second channel into the fluid inlet and outlet channel.
Further, the switching mechanism is a three-way reversing valve, a liquid inlet and a liquid outlet of the three-way reversing valve are communicated with the liquid inlet and the liquid outlet channel, a liquid outlet of the three-way reversing valve is communicated with the first channel, and a liquid inlet of the three-way reversing valve is communicated with the second channel.
Further, the three-way reversing valve comprises a valve core rotatably arranged in the closed end and a valve rod in transmission connection with the valve core;
the valve core is internally provided with a valve core channel, and the valve core can be driven to rotate by screwing the valve rod, so that the valve core channel moves to a state of communicating the liquid inlet and outlet of the three-way reversing valve with the liquid outlet of the three-way reversing valve or a state of communicating the liquid inlet and outlet of the three-way reversing valve with the liquid inlet of the three-way reversing valve.
The beneficial effects of the utility model are as follows: the hollow needle is provided with a first channel serving as a liquid inlet channel, a second channel serving as a liquid outlet channel in the closed end of the syringe barrel, a filtering device is arranged on the second channel, and a switching mechanism is also arranged in the closed end; when a nurse sucks the liquid medicine by using the hollow needle, the liquid inlet and outlet channel is communicated with the first channel through the switching mechanism, so that the smooth suction of the liquid medicine can be ensured; when a nurse uses the hollow needle to inject the liquid medicine, the liquid inlet and outlet channel is communicated with the second channel through the switching mechanism, so that the liquid medicine can be ensured to be successfully pushed into the liquid bag or the patient after being dissolved, and the filtering device on the second channel can filter foreign matters such as bottle stopper scraps and the like sucked into the hollow needle in the sucking process, so that the foreign matters are prevented from entering the liquid bag or the patient along with the liquid medicine, the safety of the patient is ensured, and the contradiction between doctors and patients is reduced.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
FIG. 2 is an enlarged view of a portion of the utility model at P in FIG. 1 during pumping;
FIG. 3 is an enlarged view of a portion of the utility model at P in FIG. 1 during injection;
marked in the figure as: syringe barrel 100, closed end 110, fluid inlet and outlet channel 111, first channel 112, second channel 113, needle nozzle 120, three-way directional valve 130, valve core 131, valve core channel 132, piston 200, piston shaft 210, piston body 220, piston stem 230, filter screen 310, needle 400, pintle 410, needle stem 420, needle tip 421.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "front", "rear", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or component in question must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model; "plurality" generally refers to two or more. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, 2 and 3, the hollow needle with filtering function comprises a syringe barrel 100, a piston 200 and a filtering device;
the syringe barrel 100 is the main body part of the hollow needle, which is generally cylindrical in structure, for containing a medical fluid; syringe barrel 100 is typically made of stainless steel or plastic and is typically provided on its outer surface with graduations that characterize the volume of its interior cavity; the front end of the syringe barrel 100 is a closed end 110, the closed end 110 is provided with a needle connecting nozzle 120, the closed end 110 is internally provided with a liquid inlet and outlet channel 111 communicated with the needle connecting nozzle 120, and the closed end 110 is internally provided with a first channel 112 communicated with the inner cavity of the syringe barrel 100; the needle connecting nozzle 120 is mainly used for connecting with the needle 400; the closed end 110 is also provided with a second channel 113 which is communicated with the inner cavity of the syringe barrel 100; the first channel 112 is a liquid inlet channel, the second channel 113 is a liquid outlet channel, and the filtering device is arranged on the second channel 113; the filter device can be a plurality of filter elements, filter plates, filter cylinders and the like;
the piston 200 is disposed in the inner cavity of the syringe barrel 100 and is movable in the axial direction of the syringe barrel 100; the piston 200 is used to form negative pressure in the inner cavity of the syringe barrel 100 to suck the medicine liquid and to push the medicine liquid to be injected; the piston 200 generally includes a piston shaft 210, a piston body 220 disposed at a front end of the piston shaft 210, and a piston stem 230 disposed at a rear end of the piston shaft 210; the plunger body 220 is typically made of rubber or plastic and forms a movable seal with the interior cavity of the syringe barrel 100;
the closed end 110 is also provided with a switching mechanism which can communicate the liquid inlet and outlet channel 111 with the first channel 112 when the hollow needle is sucked and can communicate the liquid inlet and outlet channel 111 with the second channel 113 when the hollow needle is injected; the switching mechanism is mainly used for switching the liquid medicine channel communicated with the liquid inlet and outlet channel 111 so as to respectively perform sucking and injecting operations of liquid medicine; the switching mechanism may be implemented in a variety of ways, such as: by means of reversing valves, by means of a plurality of valves of differing open and closed states, by means of a plurality of unidirectional valves of opposite flow direction, by means of a plurality of clutch valves, etc.
When a nurse sucks the liquid medicine by using the hollow needle, the liquid inlet and outlet channel 111 is communicated with the first channel 112 through the switching mechanism, so that the smooth suction of the liquid medicine can be ensured, the first channel 112 is not provided with a filter device, and the blocking effect in the liquid medicine sucking process is small; when a nurse injects the liquid medicine by using the hollow needle, the liquid inlet and outlet channel 111 is communicated with the second channel 113 through the switching mechanism, so that the liquid medicine can be ensured to be successfully pushed into the liquid bag or the patient after being dissolved, and the filtering device on the second channel 113 can filter foreign matters such as bottle stopper scraps and the like sucked into the hollow needle in the sucking process, so that the foreign matters are prevented from entering the liquid bag or the patient along with the liquid medicine.
As an implementation of the filtering device, as shown in fig. 1, 2 and 3 again, it is a filter screen 310 disposed at the liquid inlet of the second channel 113. The filter screen 310 is arranged at the liquid inlet of the second channel 113, so that the filter screen is convenient to clean and replace; the filter screen 310 is generally made of a polymer material such as polyamide or polycarbonate, which has good biocompatibility and high temperature resistance, and can effectively filter out foreign matters and ensure purity and safety of the liquid medicine.
Specifically, as further shown in fig. 1, the hollow needle further includes a needle head 400 detachably disposed on the connecting nozzle 120. The needle 400 generally includes a pintle 410 and a needle stem 420 disposed on the pintle 410, the front end of the needle stem 420 having a needle tip 421.
As one implementation of the switching mechanism, specifically, it includes a first control valve that communicates the liquid inlet and outlet passage 111 with the first passage 112, and a second control valve that communicates the liquid inlet and outlet passage 111 with the second passage 113; the first control valve is in an open state and the second control valve is in a closed state when the empty needle is sucked, and the first control valve is in a closed state and the second control valve is in an open state when the empty needle is injected. Compared with other fluid switching mechanisms, the switching mechanism has the advantages of simple structure, easiness in manufacturing and maintenance and the like, and can reduce the production cost.
As another implementation manner of the switching mechanism, specifically, it includes a first one-way valve that communicates the liquid inlet and outlet channel 111 with the first channel 112, and a second one-way valve that communicates the liquid inlet and outlet channel 111 with the second channel 113; the first one-way valve allows fluid to flow only from the inlet and outlet passage 111 into the first passage 112, and the second one-way valve allows fluid to flow only from the second passage 113 into the inlet and outlet passage 111. Compared with other fluid switching mechanisms, the switching mechanism has the following advantages: 1) Because the first one-way valve and the second one-way valve limit the liquid medicine to flow only in one direction, a nurse does not need to perform manual switching operation when in use, thereby being beneficial to rapid extraction and injection of the liquid medicine and being not easy to make mistakes; 2) The one-way valve is adopted, so that the countercurrent of the liquid medicine between the channels can be avoided, and the stability of the system is ensured; 3) Simple structure, easy manufacture and maintenance.
As still another implementation manner of the switching mechanism, in particular, it is preferable that the three-way reversing valve 130 is provided, and the liquid inlet and outlet of the three-way reversing valve 130 is communicated with the liquid inlet and outlet channel 111, the liquid outlet of the three-way reversing valve is communicated with the first channel 112, and the liquid inlet of the three-way reversing valve is communicated with the second channel 113. The switching mechanism in the form of the three-way reversing valve 130 not only can rapidly and simply switch the fluid channels, but also has wide application in the field of medical instruments and is easy to process and manufacture.
Specifically, as further shown in fig. 1, 2 and 3, the three-way reversing valve 130 includes a valve core 131 rotatably disposed in the closed end 110, and a valve stem drivingly connected to the valve core 131; the valve core 131 is internally provided with a valve core channel 132, and the valve rod can be screwed to drive the valve core 131 to rotate, so that the valve core channel 132 moves to a state of communicating the liquid inlet and outlet of the three-way reversing valve 130 with the liquid outlet thereof, or a state of communicating the liquid inlet and outlet of the three-way reversing valve 130 with the liquid inlet thereof.
Claims (10)
1. An empty needle with a filtering function comprises a syringe barrel (100), a piston (200) and a filtering device;
the front end of the syringe barrel (100) is a closed end (110), the closed end (110) is provided with a needle connecting nozzle (120), a liquid inlet and outlet channel (111) communicated with the needle connecting nozzle (120) is arranged in the closed end (110), and a first channel (112) communicated with the inner cavity of the syringe barrel (100) is also arranged in the closed end (110);
the piston (200) is arranged in the inner cavity of the syringe barrel (100) and can move along the axial direction of the syringe barrel (100);
the method is characterized in that: a second channel (113) communicated with the inner cavity of the syringe barrel (100) is also arranged in the closed end (110); the first channel (112) is a liquid inlet channel, the second channel (113) is a liquid outlet channel, and the filtering device is arranged on the second channel (113);
the closed end (110) is also internally provided with a switching mechanism which can be used for communicating the liquid inlet and outlet channel (111) with the first channel (112) when the hollow needle is sucked and can be used for communicating the liquid inlet and outlet channel (111) with the second channel (113) when the hollow needle is injected.
2. The hollow needle with filtering function according to claim 1, characterized in that: the syringe barrel (100) is provided with graduation marks for representing the inner cavity volume.
3. The hollow needle with filtering function according to claim 1, characterized in that: the piston (200) includes a piston shaft (210), a piston body (220) provided at a front end of the piston shaft (210), and a piston handle (230) provided at a rear end of the piston shaft (210).
4. The hollow needle with filtering function according to claim 1, characterized in that: the filtering device is a filter screen (310) arranged at the liquid inlet of the second channel (113).
5. The hollow needle with filtering function according to claim 1, characterized in that: also comprises a needle head (400) detachably arranged on the needle connecting mouth (120).
6. The hollow needle with filtering function according to claim 5, wherein: the needle head (400) comprises a needle bolt (410) and a needle stem (420) arranged on the needle bolt (410), and the front end of the needle stem (420) is provided with a needle point (421).
7. The hollow needle with filtering function according to any one of claims 1 to 6, characterized in that: the switching mechanism comprises a first control valve which communicates the liquid inlet and outlet channel (111) with the first channel (112), and a second control valve which communicates the liquid inlet and outlet channel (111) with the second channel (113);
the first control valve is in an open state and the second control valve is in a closed state when the empty needle is sucked, and the first control valve is in a closed state and the second control valve is in an open state when the empty needle is injected.
8. The hollow needle with filtering function according to any one of claims 1 to 6, characterized in that: the switching mechanism comprises a first one-way valve which communicates the liquid inlet and outlet channel (111) with the first channel (112), and a second one-way valve which communicates the liquid inlet and outlet channel (111) with the second channel (113);
the first one-way valve only allows fluid to flow into the first channel (112) from the liquid inlet and outlet channel (111), and the second one-way valve only allows fluid to flow into the liquid inlet and outlet channel (111) from the second channel (113).
9. The hollow needle with filtering function according to any one of claims 1 to 6, characterized in that: the switching mechanism is a three-way reversing valve (130), the liquid inlet and outlet of the three-way reversing valve (130) are communicated with the liquid inlet and outlet channel (111), the liquid outlet of the three-way reversing valve is communicated with the first channel (112), and the liquid inlet of the three-way reversing valve is communicated with the second channel (113).
10. The hollow needle with filtering function according to claim 9, characterized in that: the three-way reversing valve (130) comprises a valve core (131) rotatably arranged in the closed end (110), and a valve rod in transmission connection with the valve core (131);
the valve core (131) is internally provided with a valve core channel (132), and the valve core (131) can be driven to rotate by screwing the valve rod, so that the valve core channel (132) moves to a state of communicating a liquid inlet and a liquid outlet of the three-way reversing valve (130) or a state of communicating the liquid inlet and the liquid outlet of the three-way reversing valve (130) with the liquid inlet of the three-way reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321156543.3U CN219921564U (en) | 2023-05-15 | 2023-05-15 | Hollow needle with filtering function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321156543.3U CN219921564U (en) | 2023-05-15 | 2023-05-15 | Hollow needle with filtering function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219921564U true CN219921564U (en) | 2023-10-31 |
Family
ID=88495513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321156543.3U Active CN219921564U (en) | 2023-05-15 | 2023-05-15 | Hollow needle with filtering function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219921564U (en) |
-
2023
- 2023-05-15 CN CN202321156543.3U patent/CN219921564U/en active Active
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