Tourniquet capable of being repeatedly pressurized and tightened

Abstract

The invention relates to the technical field of medical instruments, in particular to a tourniquet capable of being repeatedly pressurized and tightened, and mainly solves the problem that an existing gas cylinder inflatable tourniquet cannot be repeatedly pressurized and tightened. The assembly comprises a main sealing block, an exhaust block, a secondary sealing rod, a coupling nut, a driving bolt, a small pressure spring and a large pressure spring, the secondary sealing rod and the driving bolt penetrate through the main sealing block and the exhaust block respectively, stretch into the first valve hole and are coaxially connected through the coupling nut, the secondary sealing rod is sleeved with the small pressure spring, and the two ends of the small pressure spring abut against the coupling nut and the main sealing block. A conical surface is arranged on the inner wall of the first valve hole, a first sealing ring on the main sealing block is pressed on the conical surface to form secondary sealing, a second sealing ring on the secondary sealing rod is pressed on the end face of the main sealing block to form secondary sealing, and a main exhaust hole is formed in the exhaust block. And a secondary exhaust gap is formed between the secondary sealing rod and the primary sealing block.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a tourniquet capable of repeated pressurization and tightening. Background Art

[0002] When the human limbs are accidentally injured, it is necessary to stop the bleeding in time. The most effective method on the scene is to tie the arm or leg above the wound, that is, towards the heart, to prevent excessive bleeding that endangers life. Existing tourniquets, such as the rapid self-rescue tourniquet disclosed in Chinese Patent Publication No. CN117618061A, have a valve body equipped with an inflation valve, an exhaust valve, and a safety valve. However, the tourniquet has the following disadvantages: first, the inflation and deflation control is not sensitive enough. The gas in the compressed gas cylinder can easily be filled into the air bag at one time, resulting in over-pressure deflation. The tourniquet cannot be inflated multiple times, which is not conducive to preventing the tourniquet from being tightened for a long time, causing distal tissue necrosis and repeated tightening. Therefore, this tourniquet has shortcomings in terms of complete pressure release at intervals and tightness adjustment; second, it is easy to leak. The structure sealed by the sliding gap between the valve core and the valve body is not airtight; third, the valve body has separate inflation valves, exhaust valves, and safety valves, making the entire valve body inconvenient to process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a tourniquet that can be repeatedly pressurized and tightened, mainly overcoming the problem that the existing gas cylinder inflatable tourniquet cannot be repeatedly pressurized and tightened.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: A hemostatic belt that can be repeatedly pressurized and tightened, which has a tie strap, an airbag, a compressed gas cylinder, and a valve body. The tie strap that can form an annular binding structure includes a strip-shaped belt body and a buckle at one end of the belt body. The valve body is fixed on the outer wall of the airbag, the airbag is fixed on the tie strap, a rear inflation channel is provided inside the valve body, the compressed gas cylinder is screwed onto the valve body, and after the bottle mouth is punctured by a puncture needle inside the valve body, gas enters the rear inflation channel. The valve body has an inflation valve for conducting or closing the rear inflation channel and the airbag, and a pressure relief safety valve is provided on the valve body. The pressure relief safety valve includes a first valve hole on the valve body that penetrates the airbag and the external atmosphere, and a pressure relief safety valve core assembly installed in the first valve hole. The pressure relief safety valve core assembly includes a movable main seal block at the airbag end of the first valve hole and a fixed exhaust block at the external atmosphere end of the first valve hole. It also includes a secondary seal rod, a coupling nut, a driving bolt, a small compression spring, and a large compression spring. The secondary seal rod passes through the main seal block and extends into the first valve hole, the driving bolt passes through the exhaust block and extends into the first valve hole. The secondary seal rod and the driving bolt are coaxially arranged and are screwed against each other on the coupling nut. The small compression spring is sleeved on the secondary seal rod and its two ends respectively abut against the coupling nut and the main seal block. The large compression spring is sleeved outside the small compression spring and its two ends respectively abut against the exhaust block and the main seal block. A first sealing ring is arranged in the annular groove on the main seal block, and a conical surface with a small mouth close to the airbag and a large mouth far from the airbag is provided on the inner wall of the first valve hole. 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 seal rod, and the second sealing ring is pressed against the end surface of the main seal block facing the airbag under the action of the small compression spring to form a secondary seal. A main exhaust hole is provided on the exhaust block, and there is a secondary exhaust gap between the secondary seal rod and the main seal block;

[0005] When the driving bolt is pushed to move into the first valve hole, the secondary seal is released, and the gas in the airbag is discharged successively through the secondary exhaust gap and the main exhaust hole, realizing a small amount of pressure relief for the airbag;

[0006] When the driving bolt is pulled to move out of the first valve hole, the main seal is released, and the gas in the airbag is discharged through the main exhaust hole, realizing a full amount of pressure relief for the airbag;

[0007] When no external force acts on the driving bolt, when the pressure of the gas in the airbag on the main seal block is greater than the pressure of the large compression spring on the main seal block, the main seal block is pushed by the air pressure to release the main seal for exhaust. When the pressure of the gas in the airbag on the main seal block is less than the pressure of the large compression spring on the main seal block, the main seal block maintains the main seal state.

[0008] Specifically, a structure capable of flexibly controlling the inflation volume and preventing air leakage from the gas cylinder is that the valve body has a front inflation channel communicating with the airbag. 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 with a clearance, and the rotation of the inflation knob drives the axial movement of the valve stem 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 sleeved 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 clearance between the valve stem and the inner wall of the contraction hole is the inflation clearance.

[0009] Specifically, a structure facilitating the manufacture of the valve body is that the valve body includes an injection-molded body, a first metal insert, and a second metal insert in the injection-molded body. 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 a plurality of notches distributed circumferentially around the driving bolt, and the secondary exhaust gap between the secondary sealing rod and the main sealing block is an annular gap.

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

[0012] Specifically, a nylon fastener is fixed on the outer surface of the belt body.

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

[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 the present invention are:

[0017] First, the valve body of the tourniquet of the present invention is provided with a decompression safety valve. With one decompression safety valve, the functions of slightly reducing the air pressure of the pressurized and tightened airbag, fully releasing the air pressure, and overpressure protection are realized. In addition, the sealing adopts the form of squeezing the conical surface and the end face by the sealing ring. The exhaust and sealing operations of the decompression safety valve are sensitive and reliable, and the gas in the gas cylinder and the airbag can be more effectively utilized. The tourniquet can meet the use requirements of repeated pressurization and tightening.

[0018] Second, the end face sealing form of the sealing ring is also used at the inflation valve, and inflation is carried out in the form of turning the knob. The inflation and sealing of the inflation valve are stable and reliable;

[0019] Third, the tourniquet can be operated with one hand, which is convenient for the injured to carry out self-help;

[0020] Fourth, the valve body is easy to process, the valve body structure is compact, and it is convenient to carry;

[0021] Fifth, the operation modes of rotary inflation, small pushing force for small amount of deflation, and large pulling force for large amount of deflation reduce the harm to the injured caused by misoperation. Description of the Drawings

[0022] Figure 1 is the developed view of the present invention;

[0023] Figure 2 is the state diagram when the present invention is in use;

[0024] Figure 3 is Figure 1 the enlarged view of part A of

[0025] Figure 4 is Figure 2 the enlarged view of part B of

[0026] Figure 5 is Figure 4 the sectional view taken along C-C of

[0027] In the figure: 1. Tie strap, 1-1. Belt body, 1-2. Buckle, 1-3. Nylon fastener, 2. Airbag, 3. Compressed gas cylinder, 4. Valve body, 5. Rear inflation channel, 6. Needle, 7. Main seal block, 8. Exhaust block, 9. Secondary seal rod, 10. Connecting nut, 11. Driving bolt, 12. Small compression spring, 13. Large compression spring, 14. First sealing ring, 15. Conical surface, 16. Second sealing ring, 17. Main exhaust hole, 18. Secondary exhaust gap, 19. Front inflation channel, 20. Rear cavity, 21. Front cavity, 22. Shrinkage hole, 23. Inflation knob, 24. Valve rod, 25. Third sealing ring, 26. Inflation gap, 27. Injection molded body, 28. First metal insert, 29. Second metal insert. Detailed Embodiment

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

[0029] As shown in the attached Figure 1A reusable pressure-tightening tourniquet, which has a tie strap 1, an airbag 2, a compressed gas cylinder 3 and a valve body 4. The tie strap 1 that can form an annular binding structure includes a long strip-shaped strap body 1-1 and a buckle 1-2 at one end of the strap body 1-1. The state when the tourniquet is used for binding and the airbag 2 is inflated is as shown in the appendix Figure 2 , the valve body 4 is adhesively fixed on the outer wall of the airbag 2, and the outer edge of the airbag 2 is sewn and fixed inside the tie strap 1; as shown in the appendix Figure 3 , a rear inflation channel 5 is provided inside the valve body 4. The compressed gas cylinder 3 is screwed onto the valve body 4, and after the bottle mouth is punctured by a puncture needle 6 inside the valve body 4, the gas enters the rear inflation channel 5. The valve body 4 has an inflation valve that conducts or closes the rear inflation channel 5 and the airbag 2.

[0030] As shown in the appendix Figure 4 and 5 , a pressure relief safety valve is provided on the valve body 4. The pressure relief safety valve includes a first valve hole that penetrates the airbag and the external atmosphere on the valve body 4 and a pressure relief safety valve core assembly installed in the first valve hole. The pressure relief safety valve core assembly includes a movable main seal block 7 at the airbag end of the first valve hole and a fixed exhaust block 8 at the external atmosphere end of the first valve hole. The exhaust block 8 is screwed into the first valve hole by thread. The pressure relief safety valve core assembly further includes a secondary seal rod 9, a coupling nut 10, a driving bolt 11, a small compression spring 12 and a large compression spring 13. The secondary seal rod 9 passes through the main seal block 7 and extends into the first valve hole. The driving bolt 11 passes through the exhaust block 8 and extends into the first valve hole. The secondary seal rod 9 and the driving bolt 11 are coaxially arranged and screwed against each other on the coupling nut 10. The small compression spring 12 is sleeved on the secondary seal rod 9 and its two ends respectively abut against the coupling nut 10 and the main seal block 7. The large compression spring 13 is sleeved outside the small compression spring 12 and its two ends respectively abut against the exhaust block 8 and the main seal block 7. A first sealing ring 14 is arranged in the annular groove on the main seal block 7. A conical surface 15 with a small mouth close to the airbag 2 and a large mouth far from the airbag 2 is arranged on the inner wall of the first valve hole. The first sealing ring 14 is pressed against the conical surface 15 under the indirect action of the large compression spring 13 to form a main seal. A second sealing ring 16 is sleeved on the secondary seal rod 9. The second sealing ring 16 is pressed against the end surface of the main seal block 7 facing the airbag 2 under the indirect action of the small compression spring 12 to form a secondary seal. A main exhaust hole 17 is provided on the exhaust block 8. There is a secondary exhaust gap 18 between the secondary seal rod 9 and the main seal block 7;

[0031] When the driving bolt 11 is pushed to move into the first valve hole, the secondary seal is released, and the gas in the airbag 2 is discharged sequentially through the secondary exhaust gap 18 and the main exhaust hole 17, realizing a small amount of pressure reduction of the airbag 2. The secondary exhaust gap 18 between the secondary seal rod 9 and the main seal block 7 is an annular gap, and the cross-sectional area of the annular gap is small, and the gas is discharged relatively slowly, achieving the effect of slowly deflating;

[0032] When the driving bolt 11 is pulled to move outwards from the first valve hole, the main seal is released, and the gas in the airbag 2 is discharged through the main exhaust hole 17, realizing the full decompression of the airbag 2. The cross-sectional area of the main exhaust hole 17 for exhausting gas is relatively large, and the gas is discharged relatively quickly, achieving the effect of rapid deflation.

[0033] When no external force acts on the driving bolt 11, when the pressure of the air in 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 exhaust. When the pressure of the air in 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, and the decompression safety valve plays a safety role without external force.

[0034] The shaft end of the secondary sealing rod 9 close to the airbag 2 has an integrally formed first retaining ring with a larger diameter for positioning the second sealing ring 16. The shaft end of the driving bolt 11 far from the airbag 2 has an integrally formed handle with a larger diameter for easy grasping. Due to the structures of the secondary sealing rod 9 and the driving bolt 11 like this, the connecting nut 10 is used to connect the two into a whole shaft. Of course, the connecting nut 10 also plays the role of bearing the small compression spring 12 to achieve secondary sealing, and the driving bolt 11 releases the secondary seal only when it is pressed.

[0035] Appendix Figure 4 The section view is a plane parallel to the axis of the compressed gas cylinder 3. Figure 4 Drawing the axis of the front inflation channel 19 and the axis of the first valve hole on one section view is only to reduce the number of attached drawings, and the axes of the two can be on different section views.

[0036] Such as Figure 4 , the valve body 4 is provided with a front inflation channel 19 communicating with the airbag 2. Again, such as Figure 3, 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 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 constriction 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 screwed onto the front cavity 21 of the second valve hole. The inflation knob 23 is also provided with a sealing ring sealed on the circumference. The valve stem 24 is installed in the constriction hole 22 with a clearance. The rotation of the inflation knob 23 drives the axial movement of the valve stem 24 to make the sealing end face of the valve stem 24 close to or far from the outer end face of the constriction 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 constriction hole 22. The clearance between the valve stem 24 and the inner wall of the constriction hole 22 is the inflation clearance 26. The axial end of the valve stem 24 close to the rear cavity 20 also has an integrally formed 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 blocked by a plug. An anti-air leakage spring for increasing the sealing performance is provided between the plug and the second retaining ring of the valve stem 24. 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 a counterbore on the end face of the inflation knob 23.

[0037] The valve body 4 includes an injection molded body 27, 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, there is a relatively large exhaust space 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 holes 17 on the exhaust block 8 are four notches distributed circumferentially around the drive bolt 11.

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

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

[0041] The compressed gas cylinder 3 of the present invention can be screwed onto the valve body 4 in advance and punctured when needed. The product can maintain the state of not being punctured during the storage and transportation stages.

[0042] The tourniquet of the present invention is suitable for use as a war preparation material because of its fast hemostasis, portability, long storage period, convenience for rapid self-help and repeated pressurization of the wounded in the wild, and safe use.

[0043] The specific embodiments described in the above specification are only the specific implementation manners of the present invention. Various examples do not constitute a limitation to the essence of the present invention. Those of ordinary skill in the art can make modifications or deformations to the previously described specific implementation manners after reading the specification, without departing from the essence and scope of the invention.

Claims

1. A hemostatic belt that can be repeatedly pressurized and tightened, comprising a tie strap (1), an airbag (2), a compressed gas cylinder (3) and a valve body (4). The tie strap (1) that can form an annular binding structure includes a long strip-shaped strap body (1-1) and a buckle (1-2) at one end of the strap body (1-1). The valve body (4) is fixed on the outer wall of the airbag (2), the airbag (2) is fixed on the tie strap (1), a rear inflation channel (5) is provided in the valve body (4), the compressed gas cylinder (3) is screwed onto the valve body (4), and after the bottle mouth is punctured by a puncture needle (6) in the valve body (4), gas enters the rear inflation channel (5). The valve body (4) has an inflation valve for conducting or closing the rear inflation channel (5) and the airbag (2). Its characteristics are: The valve body (4) is provided with a decompression safety valve. The decompression safety valve includes a first valve hole penetrating the airbag and the external atmosphere on the valve body (4) and a decompression safety valve core assembly installed in the first valve hole. The decompression safety valve core assembly includes a movable main seal block (7) at the airbag end of the first valve hole and a fixed exhaust block (8) at the external atmosphere end of the first valve hole. The decompression safety valve core assembly further includes a secondary seal rod (9), a coupling nut (10), a driving bolt (11), a small compression spring (12) and a large compression spring (13). The secondary seal rod (9) passes through the main seal block (7) and extends into the first valve hole. The driving bolt (11) passes through the exhaust block (8) and extends into the first valve hole. The secondary seal rod (9) and the driving bolt (11) are coaxially arranged and are screwed against each other on the coupling nut (10). The small compression spring (12) is sleeved on the secondary seal rod (9) and its two ends respectively abut against the coupling nut (10) and the main seal block (7). The large compression spring (13) is sleeved outside the small compression spring (12) and its two ends respectively abut against the exhaust block (8) and the main seal block (7). A first sealing ring (14) is arranged in the annular groove on the main seal block (7). A conical surface (15) with a small opening close to the airbag (2) and a large opening far from the airbag (2) is provided on the inner wall of the first valve hole. The first sealing ring (14) is pressed against the conical surface (15) under the action of the large compression spring (13) to form a main seal. A second sealing ring (16) is sleeved on the secondary seal rod (9). The second sealing ring (16) is pressed against the end face of the main seal block (7) facing the airbag (2) under the action of the small compression spring (12) to form a secondary seal. A main exhaust hole (17) is provided on the exhaust block (8). A secondary exhaust gap (18) is provided between the secondary seal rod (9) and the main seal block (7); When the driving bolt (11) is pushed to move into the first valve hole, the secondary seal is released, and the gas in the airbag (2) is discharged successively through the secondary exhaust gap (18) and the main exhaust hole (17) to realize a small amount of decompression of the airbag (2); When the driving bolt (11) is pulled to move out of the first valve hole, the main seal is released, and the gas in the airbag (2) is discharged through the main exhaust hole (17) to realize a full amount of decompression of the airbag (2); When no external force acts on the driving bolt (11), when the pressure of the air pressure in 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 in 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. The repeatable pressure tightening tourniquet according to claim 1, characterized in that: The valve body (4) is provided with a front inflation passage (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 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 rod (24), and a third sealing ring (25). The valve rod (24) is installed in the contraction hole (22) with a clearance, and the rotation of the inflation knob (23) drives the valve rod (24) to axially move so that the sealing end face of the valve rod (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 rod (24) is located between the sealing end face of the valve rod (24) and the outer end face of the contraction hole (22). The clearance between the valve rod (24) and the inner wall of the contraction hole (22) is the inflation clearance (26).

3. The repeatable pressure tightening tourniquet according to claim 2, characterized in that: The valve body (4) includes an injection molding body (27), a first metal insert (28), and a second metal insert (29) in the injection molding 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).

4. The repeatable pressure-tightening tourniquet according to claim 1, characterized in that: The main exhaust holes (17) on the exhaust block (8) are a plurality of notches distributed circumferentially around the driving 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 repeatable pressure tightening tourniquet according to claim 1, characterized in that: The puncture needle (6) is a hollow puncture needle. The puncture needle (6) is coaxial with the compressed gas cylinder (3). The puncture needle (6) has a conical puncture part and a hollow part. The hollow part communicates with the inner cavity of the compressed gas cylinder (3) and the rear inflation passage (5).

6. The repeatable pressure tightening tourniquet according to claim 1, characterized in that: A nylon fastener (1-3) is fixed on the outer surface of the belt body (1-1).

7. The repeatable pressure tightening tourniquet according to claim 1, characterized in that: The part of the airbag (2) except for the part connected to the valve body (4) is wrapped in the cable tie (1).

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

9. The repeatable pressure tightening tourniquet 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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