A tourniquet that can be repeatedly pressurized to tighten

Abstract

This utility model relates to the field of medical device technology, and in particular to a tourniquet that can be repeatedly pressurized and tightened. It mainly overcomes the problem that existing gas cylinder-inflatable tourniquets cannot be repeatedly pressurized and tightened. The inflation valve body has a first valve hole and a pressure-reducing safety valve core assembly at that hole. The assembly includes a main sealing block, an exhaust block, a secondary sealing rod, a connecting nut, a drive bolt, a small compression spring, and a large compression spring. The secondary sealing rod and the drive bolt pass through the main sealing block and the exhaust block, respectively, and extend into the first valve hole, coaxially connected by the connecting nut. The small compression spring is sleeved on the secondary sealing rod, with both ends pressing against the connecting nut and the main sealing block. The large compression spring is sleeved outside the small compression spring, with both ends pressing against the exhaust block and the main sealing block. A conical surface is provided on the inner wall of the first valve hole. A first sealing ring on the main sealing block presses against the conical surface to form a secondary seal. A second sealing ring on the secondary sealing rod presses against the end face of the main sealing block to form a secondary seal. A main exhaust hole is provided on the exhaust block, and a secondary exhaust gap exists between the secondary sealing rod and the main sealing block.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a tourniquet that can be repeatedly tightened by pressure. Background Technology

[0002] When the human limbs are accidentally injured, it is necessary to stop the bleeding immediately. The most effective method on-site is to tie a tourniquet above the wound, towards the heart, to prevent excessive blood loss and endanger life. One existing tourniquet, such as the rapid self-rescue tourniquet disclosed in Chinese Patent Publication No. CN117618061A, has an inflation valve, an exhaust valve, and a safety valve on the valve body. However, it has the following disadvantages: 1. The inflation and deflation control is not sensitive enough. Gas from the compressed gas cylinder can easily fill the air bladder at once, leading to overpressure and deflation. It cannot be re-inflated, which is not conducive to preventing prolonged use and necrosis of distal tissues. Therefore, this tourniquet is insufficient in terms of completely releasing pressure at intervals and adjusting tightness. 2. It is prone to air leakage. The structure sealed by the sliding gap between the valve core and the valve body has poor airtightness. 3. The valve body has separate inflation, exhaust, and safety valves, making the entire valve body inconvenient to manufacture. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tourniquet that can be repeatedly tightened by pressure, which mainly overcomes the problem that the existing gas cylinder inflatable tourniquet cannot be repeatedly tightened by pressure.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a tourniquet that can be repeatedly pressurized and tightened, comprising a cable tie, an air bladder, a compressed air cylinder, and a valve body. The cable tie, which can form a ring-shaped binding structure, includes a long strip-shaped band and a buckle at one end of the band. The valve body is fixed to the outer wall of the air bladder, and the air bladder is fixed to the cable tie. The valve body has a rear inflation channel. The compressed air cylinder is screwed onto the valve body, and gas enters the rear inflation channel after the cylinder opening is punctured by a needle inside the valve body. The valve body has an inflation valve that opens or closes the rear inflation channel and the air bladder. The valve body has a pressure relief valve. The pressure relief valve includes a first valve hole on the valve body that connects the air bladder to the external atmosphere and a pressure relief valve core assembly installed in the first valve hole. The pressure relief valve core assembly includes a movable main sealing block located at the air bladder end of the first valve hole and a fixed exhaust block located at the external atmosphere end of the first valve hole. It also includes a secondary sealing rod and a connecting nut. The system includes a drive bolt, a small compression spring, and a large compression spring. The secondary sealing rod passes through the main sealing block and extends into the first valve hole. The drive bolt passes through the exhaust block and extends into the first valve hole. The secondary sealing rod and the drive bolt are coaxially arranged and screwed onto the connecting nut. The small compression spring is sleeved on the secondary sealing rod, with its two ends pressing against the connecting nut and the main sealing block, respectively. The large compression spring is sleeved outside the small compression spring, with its two ends pressing against the exhaust block and the main sealing block, respectively. A first sealing ring is provided in the annular groove on the main sealing block. The inner wall of the first valve hole has a conical surface with a small opening close to the air bladder and a large opening far from the air bladder. The first sealing ring is pressed against the conical surface under the action of the large compression spring to form a main seal. A second sealing ring is sleeved on the secondary sealing rod. The second sealing ring is pressed against the end face of the main sealing block facing the air bladder under the action of the small compression spring to form a secondary seal. A main exhaust hole is provided on the exhaust block. There is a secondary exhaust gap between the secondary sealing rod and the main sealing block.

[0005] When the drive bolt is pushed into the first valve hole, the secondary seal is released, allowing the gas in the airbag to be discharged sequentially through the secondary exhaust gap and the main exhaust hole, thereby achieving a small amount of pressure reduction in the airbag.

[0006] When the drive bolt is pulled to move outward from the first valve hole, the main seal is released, allowing the gas inside the airbag to be discharged through the main exhaust hole, thus achieving full decompression of the airbag.

[0007] When no external force is applied to the drive bolt, when the pressure of the air pressure inside the airbag on the main sealing block is greater than the pressure of the large compression spring on the main sealing block, the main sealing block is pushed by the air pressure to release the main seal and achieve exhaust. When the pressure of the air pressure inside the airbag on the main sealing block is less than the pressure of the large compression spring on the main sealing block, the main sealing block maintains the main sealing state.

[0008] Specifically, a structure capable of flexibly controlling the inflation volume and preventing gas cylinder leakage includes a valve body with a front inflation channel communicating with the air bladder. The inflation valve includes a second valve hole on the valve body and an inflation valve core assembly installed in the second valve hole. The second valve hole has a rear cavity and a front cavity in the axial direction. The rear inflation channel communicates with the rear cavity of the second valve hole, and the front inflation channel communicates with the front cavity of the second valve hole. The rear cavity and the front cavity of the second valve hole are connected by a contraction hole. The inflation valve core assembly includes an inflation knob, a valve stem, and a third sealing ring. The valve stem is installed in the contraction hole. The rotation of the inflation knob drives the valve stem to move axially, so that the sealing end face of the valve stem is close to or far from the outer end face of the contraction hole. The third sealing ring, fitted on the valve stem, is located between the sealing end face of the valve stem and the outer end face of the contraction hole. The gap between the valve stem and the inner wall of the contraction hole is the inflation gap.

[0009] Specifically, a structure that facilitates valve body manufacturing is provided in which the valve body includes an injection-molded body and a first metal insert and a second metal insert within the injection-molded body, wherein the conical surface of the first valve hole is located on the first metal insert, and the second valve hole is located on the second metal insert.

[0010] Specifically, the main exhaust holes on the exhaust block are several notches distributed circumferentially around the drive bolt, and the secondary exhaust gap between the secondary sealing rod and the main sealing block is an annular gap.

[0011] Specifically, the needle is a hollow needle, the needle is coaxial with the compressed gas cylinder, the needle has a conical part and a hollow part, and the hollow part connects the inner cavity of the compressed gas cylinder with the rear inflation channel.

[0012] Specifically, a nylon buckle is fixed to the outer surface of the belt.

[0013] Specifically, the part of the airbag except for the part connected to the valve body is wrapped in cable ties.

[0014] Specifically, the compressed gas cylinder is filled with carbon dioxide gas.

[0015] Specifically, the valve body is glued to the outer wall of the airbag.

[0016] The beneficial effects of this utility model are:

[0017] I. The tourniquet of this utility model has a pressure reducing safety valve on its valve body. The pressure reducing safety valve realizes three functions: small reduction of air pressure in the pressure tightening airbag, full release, and overpressure protection. In addition, the sealing adopts the form of sealing ring extrusion cone surface and end face. The pressure reducing safety valve has sensitive and reliable venting and sealing operation, and can more effectively utilize the gas in the gas cylinder and airbag. The tourniquet can meet the needs of repeated pressure tightening.

[0018] Second, the inflation valve also uses a sealing ring end face seal, and inflation is achieved by turning the knob. The inflation and sealing of the inflation valve are stable and reliable.

[0019] Third, tourniquets can be operated with one hand, making it easier for the injured to perform self-rescue;

[0020] IV. The valve body is easy to process, has a compact structure, and is easy to carry;

[0021] Fifth, the operation method of rotating to inflate, releasing a small amount of air with a small pushing force, and releasing a large amount of air with a large pulling force reduces the risk of injury to the injured person due to misoperation. Attached Figure Description

[0022] Figure 1 This is an unfolded diagram of the present invention;

[0023] Figure 2 This is a diagram showing the state of this utility model in use;

[0024] Figure 3 yes Figure 1 Enlarged view of point A;

[0025] Figure 4 yes Figure 2 Enlarged view of point B;

[0026] Figure 5 yes Figure 4 CC section view.

[0027] In the diagram: 1. Cable tie, 1-1. Strap body, 1-2. Hook and loop fastener, 1-3. Nylon buckle, 2. Airbag, 3. Compressed air cylinder, 4. Valve body, 5. Rear inflation channel, 6. Needle, 7. Main sealing block, 8. Exhaust block, 9. Secondary sealing rod, 10. Connecting nut, 11. Drive bolt, 12. Small compression spring, 13. Large compression spring, 14. First sealing ring, 15. Conical surface, 16. Secondary sealing ring, 17. Main exhaust port, 18. Secondary exhaust gap, 19. Front inflation channel, 20. Rear cavity, 21. Front cavity, 22. Contraction hole, 23. Inflation knob, 24. Valve stem, 25. Third sealing ring, 26. Inflation gap, 27. Injection molded body, 28. First metal insert, 29. Second metal insert. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] As attached Figure 1A re-pressurizable tourniquet comprises a strap 1, an air bladder 2, a compressed air cylinder 3, and a valve body 4. The strap 1, which forms a ring-shaped binding structure, includes a long strip 1-1 and a buckle 1-2 at one end of the strip 1-1. The tourniquet is used and the air bladder 2 is inflated as shown in the attached figure. Figure 2 The valve body 4 is glued to the outer wall of the airbag 2, and the outer edge of the airbag 2 is sewn and fixed inside the cable tie 1; as shown in the attached... Figure 3 The valve body 4 is provided with a rear inflation channel 5. The compressed gas cylinder 3 is screwed onto the valve body 4 and the gas enters the rear inflation channel 5 after the needle 6 inside the valve body 4 punctures the bottle opening. The valve body 4 has an inflation valve that can open or close the rear inflation channel 5 and the air bag 2.

[0030] As attached Figure 4 and 5 The valve body 4 has a pressure-reducing safety valve, which includes a first valve hole on the valve body 4 that connects the air bladder to the external atmosphere and a pressure-reducing safety valve core assembly installed in the first valve hole. The pressure-reducing safety valve core assembly includes a movable main sealing block 7 located at the air bladder end of the first valve hole and a fixed exhaust block 8 located at the external atmosphere end of the first valve hole. The exhaust block 8 is threaded into the first valve hole. The pressure-reducing safety valve core assembly also includes a secondary sealing rod 9, a connecting nut 10, a drive bolt 11, a small compression spring 12, and a large compression spring 13. The secondary sealing rod 9 passes through the main sealing block 7 and extends into the first valve hole. The drive bolt 11 passes through the exhaust block 8 and extends into the first valve hole. The secondary sealing rod 9 and the drive bolt 11 are coaxially arranged and screwed onto the connecting nut 10. The small compression spring 12 is sleeved on... The secondary sealing rod 9 rests on the connecting nut 10 and the main sealing block 7 at both ends. The large compression spring 13 is sleeved on the small compression spring 12 and rests on the exhaust block 8 and the main sealing block 7 at both ends. The main sealing block 7 has a first sealing ring 14 in the annular groove. The inner wall of the first valve hole has a conical surface 15 with a small opening close to the airbag 2 and a large opening far from the airbag 2. The first sealing ring 14 is pressed on the conical surface 15 under the indirect action of the large compression spring 13 to form a main seal. The secondary sealing rod 9 is sleeved with a second sealing ring 16. The second sealing ring 16 is pressed on the end face of the main sealing block 7 facing the airbag 2 under the indirect action of the small compression spring 12 to form a secondary seal. The exhaust block 8 has a main exhaust hole 17. There is a secondary exhaust gap 18 between the secondary sealing rod 9 and the main sealing block 7.

[0031] When the drive bolt 11 is pushed into the first valve hole, the secondary seal is released, allowing the gas in the airbag 2 to be discharged sequentially through the secondary exhaust gap 18 and the main exhaust hole 17, thereby achieving a small amount of pressure reduction on the airbag 2. The secondary exhaust gap 18 between the secondary sealing rod 9 and the main sealing block 7 is an annular gap. The cross-sectional area of ​​the annular gap is small, and the gas is discharged relatively slowly, thus achieving the effect of slowly releasing the gas.

[0032] When the drive bolt 11 is pulled to move out of the first valve hole, the main seal is released, allowing the gas in the airbag 2 to be discharged through the main exhaust port 17, thus achieving full pressure reduction of the airbag 2. The main exhaust port 17 has a large cross-sectional area for exhaust, and the gas is discharged relatively quickly, achieving the effect of rapid gas release.

[0033] When no external force is applied to the drive bolt 11, when the pressure of the air pressure inside the airbag 2 on the main sealing block 7 is greater than the pressure of the large compression spring 13 on the main sealing block 7, the main sealing block 7 is pushed by the air pressure to release the main seal and achieve exhaust. When the pressure of the air pressure inside the airbag 2 on the main sealing block 7 is less than the pressure of the large compression spring 13 on the main sealing block 7, the main sealing block 7 maintains the main sealing state. When there is no external force, the pressure reducing safety valve plays a safety role.

[0034] The secondary sealing rod 9, near the shaft end of the airbag 2, has an integral first retaining ring with a larger diameter for positioning the second sealing ring 16. The drive bolt 11, far from the shaft end of the airbag 2, has an integral handle with a larger diameter for easy gripping. Due to the structure of the secondary sealing rod 9 and the drive bolt 11, the two are connected into a whole shaft using a connecting nut 10. Of course, the connecting nut 10 also serves to support the small compression spring 12 to achieve the secondary sealing function. The drive bolt 11 only releases the secondary seal when it is pressed.

[0035] Appendix Figure 4 The cross-section is a plane parallel to the axis of compressed gas cylinder 3. Figure 4 The axis of the front inflation channel 19 and the axis of the first valve hole are drawn on the same cross section only to reduce the number of drawings; the axes of the two do not have to be on the same cross section.

[0036] like Figure 4 The valve body 4 has a front inflation channel 19 that communicates with the airbag 2, and for example... Figure 3The inflation valve includes a second valve hole on the valve body 4 and an inflation valve core assembly installed in the second valve hole. The second valve hole has a rear cavity 20 and a front cavity 21 in the axial direction. The rear inflation passage 5 communicates with the rear cavity 20 of the second valve hole, and the front inflation passage 19 communicates with the front cavity 21 of the second valve hole. The rear cavity 20 and the front cavity 21 of the second valve hole are connected by a contraction hole 22. The inflation valve core assembly includes an inflation knob 23, a valve stem 24, and a third sealing ring 25. The inflation knob 23 is threaded into the front cavity 21 of the second valve hole. The inflation knob 23 is also provided with a circumferential sealing ring. The valve stem 24 is installed in the contraction hole 22 with a gap. The rotation of the inflation knob 23 drives the valve stem 24 to move axially so that the sealing end face of the valve stem 24 is in contact with the valve. The outer end faces of the contraction hole 22 are close or far apart. The third sealing ring 25, which is fitted on the valve stem 24, is located between the sealing end face of the valve stem 24 and the outer end face of the contraction hole 22. The gap between the valve stem 24 and the inner wall of the contraction hole 22 is the inflation gap 26. The shaft end of the valve stem 24, which is close to the rear cavity 20, also has an integral second retaining ring with a larger diameter for positioning the third sealing ring 25. The sealing end face of the valve stem 24 is the end face on the second retaining ring. The rear cavity 20 of the second valve hole is sealed by a plug. An air leakage prevention spring is provided between the plug and the second retaining ring of the valve stem 24 to increase the sealing performance. To increase the stability of the valve stem 24, one end of the valve stem 24 located in the front cavity 21 is buried in the countersunk hole on the end face of the inflation knob 23.

[0037] The valve body 4 includes an injection-molded body 27 and a first metal insert 28 and a second metal insert 29 in the injection-molded body 27. The conical surface 15 of the first valve hole is located on the first metal insert 28, and the second valve hole is located on the second metal insert 29. In addition, a large exhaust space is left between the outer ring of the main sealing block 7 and the inner wall of the first valve hole.

[0038] As attached Figure 5 The main exhaust hole 17 on the exhaust block 8 is four notches that are circumferentially distributed around the drive bolt 11.

[0039] like Figure 3 The needle 6 is a hollow needle, coaxial with the compressed gas cylinder 3. The needle 6 has a conical part and a hollow part. The hollow part connects the inner cavity of the compressed gas cylinder 3 with the rear inflation channel 5. The needle 6 is the third metal insert in the valve body 4.

[0040] In other aspects, the outer surface of the belt body 1-1 is fixed with nylon buckles 1-3, the part of the airbag 2 except for the part connected to the valve body 4 is wrapped in the cable tie 1, and the compressed gas cylinder 3 is filled with carbon dioxide gas.

[0041] The compressed gas cylinder 3 of this invention can be screwed onto the valve body 4 and punctured in advance when needed, so that the product can remain unpunctured during storage and transportation.

[0042] The tourniquet of this invention is suitable for use as a war reserve material because it stops bleeding quickly, is easy to carry, has a long shelf life, facilitates rapid self-rescue and repeated pressure application for wounded people in the field, and is safe to use.

[0043] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can make modifications or variations to the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.

Claims

1. A tourniquet that can be repeatedly tightened by pressure, comprising a tourniquet (1), an air bladder (2), a compressed air cylinder (3), and a valve body (4), wherein the tourniquet (1) forms a ring-shaped binding structure, the tourniquet (1) comprising a long strip (1-1) and a buckle (1-2) at one end of the strip (1-1), the valve body (4) being fixed to the outer wall of the air bladder (2), the air bladder (2) being fixed to the tourniquet (1), the valve body (4) having a rear inflation channel (5), the compressed air cylinder (3) being screwed onto the valve body (4) and the air bladder (2) being punctured by a needle (6) inside the valve body (4) to allow gas to enter the rear inflation channel (5), the valve body (4) having an inflation valve for opening or closing the rear inflation channel (5) and the air bladder (2), characterized in that: The valve body (4) has a pressure-reducing safety valve. The pressure-reducing safety valve includes a first valve hole on the valve body (4) that connects the air bladder to the external atmosphere and a pressure-reducing safety valve core assembly installed in the first valve hole. The pressure-reducing safety valve core assembly includes a movable main sealing block (7) located at the air bladder end of the first valve hole and a fixed exhaust block (8) located at the external atmosphere end of the first valve hole. The pressure-reducing safety valve core assembly also includes a secondary sealing rod (9), a connecting nut (10), a drive bolt (11), a small compression spring (12), and a large compression spring (13). The secondary sealing rod (9) passes through the main sealing block (7) and extends into the first valve hole. The drive bolt (11) passes through the exhaust block (8) and extends into the first valve hole. The secondary sealing rod (9) and the drive bolt (11) are coaxially arranged and screwed onto the connecting nut (10). The small compression spring (12) is sleeved on the secondary sealing rod (9) and its two ends are respectively abutted. On the connecting nut (10) and the main sealing block (7), the large compression spring (13) is sleeved outside the small compression spring (12) and its two ends are respectively pressed against the exhaust block (8) and the main sealing block (7). The main sealing block (7) has a first sealing ring (14) in the annular groove. The inner wall of the first valve hole has a conical surface (15) with a small opening close to the air bag (2) and a large opening far from the air bag (2). The first sealing ring (14) is pressed on the conical surface (15) under the action of the large compression spring (13) to form a main seal. The secondary sealing rod (9) is sleeved with a second sealing ring (16). The second sealing ring (16) is pressed on the end face of the main sealing block (7) facing the air bag (2) under the action of the small compression spring (12) to form a secondary seal. The exhaust block (8) has a main exhaust hole (17). There is a secondary exhaust gap (18) between the secondary sealing rod (9) and the main sealing block (7). When the drive bolt (11) is pushed into the first valve hole, the secondary seal is released, allowing the gas in the airbag (2) to be discharged sequentially through the secondary exhaust gap (18) and the main exhaust hole (17), thereby achieving a small amount of pressure reduction in the airbag (2); When the drive bolt (11) is pulled to move out of the first valve hole, the main seal is released, allowing the gas in the airbag (2) to be discharged through the main exhaust hole (17), thereby achieving full decompression of the airbag (2); When no external force is applied to the drive bolt (11), when the pressure of the air pressure inside the airbag (2) on the main sealing block (7) is greater than the pressure of the large compression spring (13) on the main sealing block (7), the main sealing block (7) is pushed by the air pressure to release the main seal and realize the exhaust. When the pressure of the air pressure inside the airbag (2) on the main sealing block (7) is less than the pressure of the large compression spring (13) on the main sealing block (7), the main sealing block (7) maintains the main sealing state.

2. A repressurizable tourniquet according to claim 1, characterized in that: The valve body (4) has a front inflation channel (19) communicating with the airbag (2). The inflation valve includes a second valve hole on the valve body (4) and an inflation valve core assembly installed in the second valve hole. The second valve hole has a rear cavity (20) and a front cavity (21) in the axial direction. The rear inflation channel (5) communicates with the rear cavity (20) of the second valve hole, and the front inflation channel (19) communicates with the front cavity (21) of the second valve hole. The rear cavity (20) and the front cavity (21) of the second valve hole are connected by a contraction hole (22). The inflation valve core assembly includes an inflation knob. (23), valve stem (24) and third sealing ring (25), the valve stem (24) is installed in the contraction hole (22) with a gap, the valve stem (24) is driven to move axially by the rotation of the inflation knob (23) so that the sealing end face of the valve stem (24) is close to or far from the outer end face of the contraction hole (22), the third sealing ring (25) sleeved on the valve stem (24) is located between the sealing end face of the valve stem (24) and the outer end face of the contraction hole (22), the gap between the valve stem (24) and the inner wall of the contraction hole (22) is the inflation gap (26).

3. A repressurizable tourniquet according to claim 2, wherein: The valve body (4) includes an injection-molded body (27) and a first metal insert (28) and a second metal insert (29) in the injection-molded body (27), wherein the conical surface (15) of the first valve hole is located on the first metal insert (28) and the second valve hole is located on the second metal insert (29).

4. The repressurizable tourniquet of claim 1, wherein: The main exhaust hole (17) on the exhaust block (8) is a number of notches distributed circumferentially around the drive bolt (11), and the secondary exhaust gap (18) between the secondary sealing rod (9) and the main sealing block (7) is an annular gap.

5. The repressurizable tourniquet of claim 1, wherein: The needle (6) is a hollow needle. The needle (6) is coaxial with the compressed gas cylinder (3). The needle (6) has a conical part and a hollow part. The hollow part connects the inner cavity of the compressed gas cylinder (3) with the rear inflation channel (5).

6. A repressurizable tourniquet according to claim 1, wherein: The outer surface of the belt (1-1) is fixed with a nylon buckle (1-3).

7. A repressurizable tourniquet according to claim 1, wherein: The airbag (2), except for the part connected to the valve body (4), is wrapped in a cable tie (1).

8. A repressurizable tourniquet according to claim 1, characterized in that: The compressed gas cylinder (3) is filled with carbon dioxide gas.

9. A tourniquet that can be repeatedly tightened by pressure according to claim 1, characterized in that: The valve body (4) is glued to the outer wall of the airbag (2).

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