CN110101941B - Bidirectional hemostatic and liquid-stopping safety device - Google Patents
Bidirectional hemostatic and liquid-stopping safety device Download PDFInfo
- Publication number
- CN110101941B CN110101941B CN201910454455.3A CN201910454455A CN110101941B CN 110101941 B CN110101941 B CN 110101941B CN 201910454455 A CN201910454455 A CN 201910454455A CN 110101941 B CN110101941 B CN 110101941B
- Authority
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- China
- Prior art keywords
- conical joint
- joint
- inner conical
- outer conical
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000002439 hemostatic effect Effects 0.000 title claims abstract description 25
- 230000002457 bidirectional effect Effects 0.000 title abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000001802 infusion Methods 0.000 abstract description 19
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000001990 intravenous administration Methods 0.000 abstract description 3
- 230000000740 bleeding effect Effects 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 239000003814 drug Substances 0.000 description 5
- 230000023597 hemostasis Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 208000032843 Hemorrhage Diseases 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16804—Flow controllers
- A61M5/16813—Flow controllers by controlling the degree of opening of the flow line
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1038—Union screw connectors, e.g. hollow screw or sleeve having external threads
Landscapes
- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Vascular Medicine (AREA)
- Pulmonology (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a bidirectional hemostatic and liquid-stopping safety device, which comprises: the sealing device comprises an inner conical joint, an outer conical joint, two sealing sheets arranged in the inner conical joint and the outer conical joint, and a detachable guide tube sleeved in the inner conical joint and the outer conical joint. The inner conical joint in the invention is connected with the terminal joint of the infusion apparatus at one end, and the outer conical joint at the other end is connected with the intravenous infusion needle (or the indwelling needle). When the infusion happens accident, the pipeline is pulled, the outer conical joint and the inner conical joint of the bidirectional hemostatic and liquid-stopping safety device are separated by opposite pulling force, at the moment, the inner conical joint can pull the guide pipe to be separated together, and when the guide pipe is separated to the limit position of the outer conical joint, the guide pipe is separated from a sealing piece in the outer conical joint, the sealing piece is closed, and the position of the outer conical joint is closed; when the drawing is continued, the conducting tube is separated from the sealing sheet in the inner conical joint, the sealing sheet is closed, and the inner conical joint is closed, so that the purposes of stopping bleeding at the patient end and stopping liquid at the infusion end are achieved.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to a bidirectional hemostatic and liquid-stopping safety device.
Background
The disposable infusion apparatus is connected with the vein of the patient through the intravenous infusion needle or the indwelling needle, so as to realize the infusion of the liquid medicine. When the liquid medicine is infused, the infusion device is separated from a patient due to careless drawing of a pipeline, blood at the patient end flows out, the liquid medicine at the infusion end flows out, and the harm or pollution to the patient and the liquid medicine waste are caused. Especially, when children and old people are in infusion treatment, the situation that the infusion set is separated from the patient is more serious. If the old infuses at night without nursing or careless, massive hemorrhage and even life danger occur.
Disclosure of Invention
The invention aims to provide a bidirectional liquid stopping installation device capable of preventing liquid medicine and blood from flowing out during unexpected release.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a bi-directional hemostatic and liquid-stopping safety device, comprising:
an outer conical joint;
the inner conical joint is arranged opposite to the outer conical joint;
the two sealing sheets are respectively and hermetically arranged at the end parts of the matched outer conical joint and the outer conical joint;
the two ends of the conduction pipe respectively penetrate through the splicing holes arranged on the two sealing sheets, and channels for conducting the two ends are arranged in the conduction pipe.
One end of the inner conical connector of the bidirectional hemostatic and liquid-stopping safety device is connected with a terminal connector of an infusion apparatus, and the outer conical connector of the other end is connected with an intravenous infusion needle (or a retention needle). When the infusion happens accident, the pipeline is pulled, the outer conical joint and the inner conical joint of the bidirectional hemostatic and liquid-stopping safety device are separated by opposite pulling force, at the moment, the inner conical joint can pull the guide pipe to be separated together, and when the guide pipe is separated to the limit position of the outer conical joint, the guide pipe is separated from a sealing piece in the outer conical joint, the sealing piece is closed, and the position of the outer conical joint is closed; when the drawing is continued, the conducting tube is separated from the sealing sheet in the inner conical joint, the sealing sheet is closed, and the inner conical joint is closed, so that the purposes of stopping bleeding at the patient end and stopping liquid at the infusion end are achieved.
Further, the sealing piece is concavely arranged at the end part of the outer conical joint, a large pressing plate is further arranged at the end part of the outer conical joint and is propped against the end surface of the sealing piece, and a first through hole for the conducting tube to pass through is formed in the center of the large pressing plate. The large pressing plate can effectively prevent the sealing piece from being brought out of the outer conical joint by the conduction pipe, so that the sealing piece can be kept at the port of the outer conical joint after the conduction pipe is separated from the outer conical joint, and the effect of sealing the outer conical joint is achieved.
Further, the sealing piece is concavely arranged at the end part of the inner conical joint, a small pressing plate is further arranged at the end part of the inner conical joint and is propped against the end surface of the sealing piece, and a second through hole for the conducting tube to pass through is formed in the center of the small pressing plate. The small pressing plate can effectively prevent the sealing piece from being brought out of the inner conical joint by the conduction pipe, so that the sealing piece can be kept at the port of the inner conical joint after the conduction pipe is separated from the inner conical joint, and the effect of sealing the inner conical joint is achieved.
Further, at least two fixed columns are arranged on the outer edges of the large pressing plate and the small pressing plate in a spoke shape, and positioning concave holes matched with the fixed columns are formed in the inner walls of the outer conical joint and the inner conical joint. The fixing column and the positioning concave hole can effectively simplify the installation steps of the large pressing plate and the small pressing plate.
Further, one end of the outer conical joint facing the inner conical joint is provided with a sheath into which the inner conical joint can be inserted, the conducting tube is axially movably arranged in the sheath, and one end of the conducting tube, which is close to the inner conical joint after being separated from the outer conical joint, does not protrude out of the end face of the sheath. The sheath can ensure that the connecting part of the guide tube can still be hidden in the sheath after the safety device is separated, other objects cannot be rubbed to pollute the guide tube, and the subsequent re-butt joint of the bidirectional hemostatic and liquid-stopping safety device is ensured to recover transfusion.
Further, at least two limit grooves are uniformly distributed on the sheath in the circumferential direction, and the limit grooves are axially arranged; the middle division surface of the conducting pipe is provided with a guide rod matched with the limiting groove, and the guide rod is sleeved in the limiting groove in a sliding fit manner. The limit groove and the guide rod can limit the travel of the guide pipe at the outer conical joint, so that the safety of the connecting end of the guide pipe during separation is ensured, meanwhile, the structure required by the cooperation of the guide pipe and the outer conical joint can be effectively simplified, the production cost is reduced, and the installation step is simplified.
Further, one end of the limiting groove, which is far away from the inner conical joint, is provided with a C-shaped clamping groove, and the C-shaped clamping groove is buckled and connected with the guide rod; the end face of the inner conical connector, which faces the guide pipe, is provided with a C-shaped buckle which is clamped with the guide rod; when the C-shaped clamping groove is disconnected, the binding force of the C-shaped clamping groove on the guide rod is smaller than the binding force of the C-shaped clamping buckle and the guide rod. The connecting form of the buckle structure can effectively ensure that the bidirectional hemostatic and liquid-stopping safety device can not be separated under the condition of not being subjected to external force, and can ensure sequential separation under the condition of being subjected to external force, thereby better achieving the effect of bidirectional sealing.
Further, the threaded connection end of the outer conical joint is of an inner threaded connection structure, and the threaded connection end of the inner conical joint is of an outer threaded connection structure. The screw thread structure can ensure the convenience of the bidirectional hemostatic and liquid-stopping safety device provided by the invention in mounting on a disposable infusion device.
Drawings
FIG. 1 is a schematic cross-sectional view of a bi-directional hemostatic and liquid-stopping safety device assembled together;
FIG. 2 is an external schematic view of a bi-directional hemostatic and liquid-stopping safety device assembled together;
FIG. 3 is a schematic view of a two-way hemostatic and liquid-stopping safety device in use;
FIG. 4 is a schematic illustration of a two-way hemostatic and liquid-stopping safety device in a disengaged state;
FIG. 5 is a schematic cross-sectional view of a bi-directional hemostatic and liquid-stopping safety device after detachment;
figure 6 is an external schematic view of a bi-directional hemostatic and liquid-stopping safety device after detachment.
Reference numerals: 1. the sealing device comprises an outer conical joint 11, a first groove 2, an inner conical joint 21, a second groove 22, a C-shaped buckle 3, a sealing piece 31, a plug hole 4, a conducting pipe 41, a guide rod 5, a large pressing plate 51, a first through hole 6, a small pressing plate 61, a second through hole 7, a sheath 71, a limit groove 72, a C-shaped clamping groove 8, a positioning concave hole 9 and a fixing column.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A bi-directional hemostatic and liquid-stopping safety device as shown in connection with fig. 1 and 4, comprising: an outer conical joint 1 with a channel inside and an inner conical joint 2 with a channel inside as well, the ends of the outer conical joint being opposite to the ends of the inner conical joint. The opposite ends of the outer conical joint and the inner conical joint are respectively provided with a sealing sheet 3 capable of sealing the passage ports of the outer conical joint and the inner conical joint, and the sealing sheets have elastic deformation capability (such as rubber sheets, silica gel and the like). Meanwhile, a conduction pipe 4 is arranged between the outer conical joint 1 and the inner conical joint 2, two ends of the conduction pipe are conical, and when the conduction pipe is assembled, two ends of the conduction pipe are respectively extruded out and extend into channels of the outer conical joint 1 and the inner conical joint 2 through inserting holes 31 arranged on two sealing sheets, and the outer conical joint and the inner conical joint are conducted through the channels arranged in the conduction pipe. When the invention is drawn by external force, the conduction pipe is withdrawn from the inserting holes 31 of the two sealing sheets, and the two inserting holes return to the initial state (the inserting holes return to the closed state under the filling of surrounding materials) to seal the outer cone joint and the inner cone street.
The invention relates to a further improvement of a bidirectional hemostasis liquid-stopping safety device, which is characterized in that a first groove 11 for installing a sealing piece is arranged at the end part of an outer conical joint 1, when the sealing piece is installed in the first groove, the end surface of the sealing piece is sunken in the end surface of the outer conical joint 1, meanwhile, a large pressing plate 5 is fixedly installed in the outer conical joint, one side of the large pressing plate is pressed against the end surface of the sealing piece, and the sealing piece 3 can be kept relatively static with the outer conical joint all the time when external drawing force is applied. At the same time, a first through hole 51 through which the conducting pipe 4 can pass is arranged in the center of the large pressing plate.
The invention relates to a further improvement of a bidirectional hemostasis liquid-stopping safety device, which is characterized in that a second groove 21 for installing a sealing piece is arranged on the end part of an inner conical connector 2, when the sealing piece is installed in the second groove, the end surface of the sealing piece is sunken with the end surface of the inner conical connector 2, meanwhile, a small pressing plate 6 is fixedly installed inside the inner conical connector, one side of the small pressing plate presses the sealing piece in the second groove, and the sealing piece 3 is ensured not to be carried out by a guide pipe when being subjected to the drawing force from the guide pipe. And a second through hole 61 for the passage of the conducting tube is arranged in the center of the small pressing plate.
The invention relates to a further improvement of a bidirectional hemostasis liquid-stopping safety device, which is characterized in that at least two positioning concave holes 8 are uniformly distributed on the inner wall of an outer conical joint 1, and fixed columns 9 with the number being matched with that of the positioning concave holes 8 are arranged on the outer edge of a large pressing plate 5 in a spoke shape, and when the large pressing plate is required to be installed in the outer conical joint, the large pressing plate is only required to be pressed, so that the positioning columns are clamped into the positioning concave holes. At least two positioning concave holes 8 are uniformly distributed on the inner wall of the inner conical joint 2, positioning columns 9 with the number matched with the positioning notch 8 are uniformly distributed on the outer edge of the small pressing plate in the circumferential direction, and when the small pressing plate is required to be installed in the inner conical joint to press and position the sealing plate, the small pressing plate 6 is required to be pressed, so that the positioning columns are clamped into the corresponding positioning concave holes.
A further improvement of the two-way hemostatic and liquid-stopping safety device according to the invention consists in that a jacket 7 is arranged extending axially on the end face of the outer conical joint 1 facing the inner conical joint 2, the inner strength of which jacket is greater than the outer diameter of the inner conical joint, and when the invention is assembled, the inner conical joint can be inserted into the jacket 7, and the conducting tube 4 is mounted axially movable in said jacket. Wherein, in order to ensure that the conduction pipe is not polluted by contact with external matters after being separated from the two sealing sheets. The end of the conduit 4, which is close to the inner conical joint, must not protrude beyond the end face of the sheath 13 after it has been detached from the outer conical joint. In a specific embodiment, the requirement of limiting the axial movement distance of the conducting tube can be achieved in various manners, and preferably, at least two uniformly distributed limiting grooves 71 are circumferentially arranged on the sheath 7, and the limiting grooves are axially arranged along the sheath. Meanwhile, guide rods 41 with the number matched with that of the limiting grooves are radially arranged on the bisecting surface of the conducting tube 4, and the guide rods are sleeved in the limiting grooves 71 in a sliding fit manner, so that the axial distance movement of the conducting tube is realized. Meanwhile, in the specific embodiment, the moving distance of the guide pipe can be limited by arranging a limiting ring belt, a limiting bulge and the like in the sheath.
The invention relates to a further improvement of a bidirectional hemostasis liquid-stopping safety device, which is characterized in that a C-shaped clamping groove 72 is arranged at one end of a limiting groove 71 far away from an inner conical joint, when one end of a conducting tube 4 passes through a plugging hole 31 of a sealing sheet 3 and enters a channel of an outer conical joint 1, an upper guide rod 41 on the conducting tube is simultaneously clamped into the C-shaped clamping groove 72, so that the conducting tube is ensured not to be extruded by the sealing sheet under the condition of not receiving external drawing force. Meanwhile, a C-shaped buckle 22 matched with the guide rod is arranged on the end face of the inner conical connector 2, when the conducting tube 4 passes through the sealing piece on the inner conical connector and enters the channel of the inner conical connector 2, the C-shaped buckle 22 is clamped on the guide rod, and the C-shaped buckle 22 and the guide rod are buckled, so that the effect that the conducting tube cannot be extruded by the sealing piece under the condition of not receiving external drawing force is achieved. Meanwhile, preferably, in order to ensure that the conduction pipe can be separated from the outer conical joint 1 and the inner conical joint 2 in sequence, the binding force of the C-shaped clamping groove on the guide rod 41 is smaller than the binding force of the C-shaped clamping buckle 22 on the guide rod. When the invention receives the drawing force from the outside, the guide rod is firstly separated from the C-shaped clamping groove under the drawing of the C-shaped buckle, the rear guide pipe axially moves in the sheath to be far away from the outer conical joint 1, when the guide pipe moves to the set position, the guide rod 41 is blocked by the limiting groove and does not move, the drawing force continues to act, the C-shaped buckle 22 is separated from the guide rod 41, and finally the separation of the guide pipe and the inner conical joint is realized. Thereby achieving the effect of two-way sealing at two ends.
The invention relates to a further improvement of a bidirectional hemostatic and liquid-stopping safety device, which is characterized in that in order to facilitate the installation of the bidirectional hemostatic and liquid-stopping safety device in a disposable infusion device, a threaded connection end of an external conical connector and the disposable infusion device adopts an internal threaded structure, and a threaded connection end of an internal conical connector and the disposable infusion device adopts an external threaded structure. Wherein the sizes of the internal thread and the external thread meet the requirements of GB/T1962.2.
Claims (4)
1. A bi-directional hemostatic and liquid-stopping safety device, comprising: an outer conical joint; the inner conical joint is arranged opposite to the outer conical joint; the two sealing sheets are respectively and hermetically arranged at the end parts of the matched outer conical joint and the outer conical joint; the two ends of the conduction pipe respectively pass through the splicing holes arranged on the two sealing sheets, and a channel for conducting the two ends is arranged in the conduction pipe;
the end, facing the inner cone joint, of the outer cone joint is provided with a sheath into which the inner cone joint can be inserted, the conducting tube is axially movably arranged in the sheath, and one end, close to the inner cone joint, of the conducting tube is not protruded out of the end face of the sheath after the conducting tube is separated from the outer cone joint;
at least two limit grooves are uniformly distributed on the sheath in the circumferential direction, and the limit grooves are axially arranged; a guide rod matched with the limit groove is arranged on the bisection surface of the conduction pipe, and the guide rod is sleeved in the limit groove in a sliding fit manner;
one end of the limiting groove, which is far away from the inner conical connector, is provided with a C-shaped clamping groove which is buckled and connected with the guide rod; the end face of the inner conical connector, which faces the guide pipe, is provided with a C-shaped buckle which is clamped with the guide rod; when the C-shaped clamping groove is disconnected, the binding force of the C-shaped clamping groove on the guide rod is smaller than the binding force of the C-shaped clamping buckle and the guide rod;
the sealing piece is concavely arranged at the end part of the outer conical joint, a large pressing plate is further arranged at the end part of the outer conical joint and is propped against the end surface of the sealing piece, and a first through hole for the conducting tube to pass through is formed in the center of the large pressing plate.
2. A bi-directional hemostatic and liquid-stopping safety device according to claim 1, wherein: the sealing piece is concavely arranged at the end part of the inner conical joint, a small pressing plate is further arranged at the end part of the inner conical joint and is propped against the end surface of the sealing piece, and a second through hole through which the conducting tube can pass is formed in the center of the small pressing plate.
3. A bi-directional hemostatic and liquid-stopping safety device according to claim 2, wherein: at least two fixed columns are arranged on the outer edges of the large pressing plate and the small pressing plate in a spoke shape, and positioning concave holes matched with the fixed columns are formed in the inner walls of the outer conical joint and the inner conical joint.
4. A bi-directional hemostatic and liquid-stopping safety device according to claim 1, wherein: the threaded connection end of the outer conical connector is of an internal threaded connection structure, and the threaded connection end of the inner conical connector is of an external threaded connection structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454455.3A CN110101941B (en) | 2019-05-29 | 2019-05-29 | Bidirectional hemostatic and liquid-stopping safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454455.3A CN110101941B (en) | 2019-05-29 | 2019-05-29 | Bidirectional hemostatic and liquid-stopping safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110101941A CN110101941A (en) | 2019-08-09 |
| CN110101941B true CN110101941B (en) | 2024-01-30 |
Family
ID=67492810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910454455.3A Active CN110101941B (en) | 2019-05-29 | 2019-05-29 | Bidirectional hemostatic and liquid-stopping safety device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110101941B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117258133B (en) * | 2023-10-10 | 2024-06-11 | 晨兴(南通)医疗器械有限公司 | Medical catheter sealing assembly and conveying system for pulmonary artery thrombus taking device |
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| GB1193759A (en) * | 1968-06-18 | 1970-06-03 | Sarns Inc | Tube Coupling for Medical Appliances |
| GB9803084D0 (en) * | 1998-02-14 | 1998-04-08 | Owen Mumford Ltd | Improvements relating to medical injection devices |
| CN204016998U (en) * | 2014-07-22 | 2014-12-17 | 李宜 | A kind of inlying catheter specialized transfusion system |
| CN105342549A (en) * | 2015-11-13 | 2016-02-24 | 浙江伏尔特医疗器械股份有限公司 | Disposable auto-destruct vaginal speculum |
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| CN210494777U (en) * | 2019-05-29 | 2020-05-12 | 浙江伏尔特医疗器械股份有限公司 | Two-way hemostasis and liquid stopping safety device |
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