Pressure reduction and flow reduction structure and medical water jet scalpel

Abstract

The invention relates to the technical field of medical instruments, and discloses a pressure-reducing and flow-reducing structure which comprises an inner pipe, an outer pipe and a pressure pipe, the outer pipe wraps the inner pipe, a flow channel is formed between the outer pipe and the inner pipe, the pressure pipe is arranged in the inner pipe and connected with the inner pipe, and one end of the pressure pipe extends out of the inner pipe and is provided with a spraying hole facing the inner pipe. The pressure pipe releases high-speed water flow to the inner pipe through the spraying holes; the inner pipe is provided with a water outlet hole and a water inlet hole which are communicated with the flow channel, the water inlet hole is far away from the spraying hole relative to the water outlet hole, the water inlet hole, the flow channel and the water outlet hole are matched to form a backflow channel, and water flow at the rear section of the inner pipe can continuously flow to the front section of the inner pipe through the backflow channel. Compared with the prior art, the pressure reduction and flow reduction structure has the advantages that the entrainment flow is reduced by optimizing the structural design of the inner tube on the premise of not changing the structure of the outer tube and not influencing the recovery condition of waste tissues cut by the water jet scalpel, the structural design is ingenious, and the cutting effect of the medical water jet scalpel is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a decompression and flow reduction structure and a medical water jet Background Art

[0002] A medical water jet impacts and destroys biological tissues by ejecting a high-speed and extremely fine water jet formed by spraying physiological saline to achieve tissue separation. It has the advantages of small trauma, less bleeding, high selectivity, etc., and is thus widely used in various surgeries. When the water jet is working in a liquid-tight environment under the liquid surface, the water jet ejected by the decompression and flow reduction structure will entrain more liquid from the target cavity due to the Venturi effect. If the flow rate in the sealed cavity of the human body is too large, in order to maintain the stability of the liquid pressure, it is necessary to increase the flow rate of the input liquid device. However, due to the working environment being a sealed cavity in the human body, improper control of the flow rate will bring great risks. When the pressure of the liquid environment is too high, the human tissue has a certain bearing range, and excessive pressure will cause great harm to the human body. Therefore, how to improve the influence of the water jet by the Venturi effect and reduce the entrained flow rate is an urgent problem to be solved at present. Summary of the Invention

[0003] To solve the above technical problems, an object of the present invention is to provide a decompression and flow reduction structure to consume the energy of the high-speed water jet and reduce the entrained flow rate of the water jet.

[0004] Based on this, the present invention provides a decompression and flow reduction structure, including an inner tube, an outer tube, and a pressure tube. The outer tube wraps the inner tube and forms a flow channel therebetween. The pressure tube is disposed in the inner tube and is connected to the inner tube. One end of the pressure tube extends outside the inner tube and is provided with a spray hole facing the inner tube. The pressure tube releases high-speed water flow to the inner tube through the spray hole;

[0005] Wherein, the inner tube is provided with a water outlet hole and a water inlet hole that communicate with the flow channel. The water inlet hole is farther from the spray hole than the water outlet hole. The water inlet hole, the flow channel, and the water outlet hole cooperate to form a reflux channel, and the water flow in the rear section of the inner tube flows to the front section of the inner tube through the reflux channel.

[0006] In some embodiments of the present application, a plurality of groups of the water outlet holes and the water inlet holes are provided along the inner tube, and each group of the water outlet holes and the water inlet holes communicate with the reflux channel respectively to form a plurality of reflux channels.

[0007] In some embodiments of the present application, the inner tube includes a first part and a second part that are arranged in sequence and communicate with each other. The diameter of the first part is smaller than that of the second part. A receiving hole is formed at one end of the first part away from the second part. The high-speed water flow sprayed from the spray hole enters the first part through the receiving hole. The outer tube is sleeved on the second part and forms the flow channel between the outer tube and the first part. The water outlet hole is arranged on the first part, and the water inlet hole is arranged on the second part.

[0008] In some embodiments of the present application, there are multiple water outlet holes, which are evenly arranged around the circumference of the first part.

[0009] In some embodiments of the present application, there are multiple water inlet holes, which are evenly arranged around the circumference of the second part.

[0010] In some embodiments of the present application, the cross-sectional area of the receiving hole is 0.01 - 100 mm 2 。

[0011] In some embodiments of the present application, the diameter d of the spray hole is 0.01 mm - 9.5 mm.

[0012] In some embodiments of the present application, the diameter D of the pressure tube is 0.08 mm - 25 mm.

[0013] In some embodiments of the present application, a working window is formed between the spray hole and the receiving hole, and the width b of the working window is 0.01 mm - 25 mm.

[0014] In some embodiments of the present application, the cross-sectional width s of the flow channel is 0.1 mm - 7.5 mm.

[0015] Another object of the present application is to provide a medical water knife having the above-mentioned decompression and flow reduction structure.

[0016] Compared with the prior art, the decompression and flow reduction structure provided by the embodiments of the present invention has the following beneficial effects:

[0017] The present invention provides a pressure reduction and flow rate reduction structure, which includes an inner tube and an outer tube arranged coaxially. A flow channel is formed between the two. A pressure tube is inserted through the inner tube. One end of the pressure tube extends outside the inner tube and is provided with a spray hole facing the inner tube. The pressure tube releases high-speed water flow through the spray hole; further, the inner tube is provided with a water outlet hole and a water inlet hole communicating with the flow channel. The water outlet hole is located on the side of the water inlet hole away from the spray hole. The water inlet hole, the flow channel and the water outlet hole cooperate to form a reflux channel, and the water flow in the rear section of the inner tube can flow to the front section of the inner tube through the reflux channel. Based on the above structure, when in use, the high-speed water flow continuously flows along the pressure tube, flows out through the spray hole and finally enters the inner tube through the receiving hole. It can be found that based on the high-speed jet of the water flow, the water flow between the spray hole and the receiving hole can cut the tissue, and at this time, a working window can be formed between the spray hole and the receiving hole; further, the speed of the water jet entering the inner tube continuously decreases. The water jet in the front section of the inner tube has a high speed and a small pressure, and the water jet in the rear section of the inner tube has a small speed and a large pressure. The water jet in the front section of the inner tube will form a negative pressure area due to the Venturi effect. The liquid entrainment effect in the negative pressure area will carry away more liquid from the liquid environment. In order to avoid this situation, the present application selects to set a water outlet hole and a water inlet hole on the inner tube to connect the flow channel and the inner cavity of the inner tube. At this time, due to the flow rate difference and pressure difference between the water jets in the front section and the rear section of the inner tube, the water jet in the rear section of the inner tube reaches the front section of the inner tube through the water inlet hole, the flow channel and the water outlet hole due to the Venturi effect, further occupying the space in the front section of the inner tube, thereby greatly reducing the entrained flow rate carried by the water jet ejected from the spray hole, forming a stagnant flow effect on the environmental liquid, and reducing the environmental liquid replenishment flow rate. In this way, the present application utilizes the Venturi effect to improve the liquid entrainment situation caused by the Venturi effect, reduces the flow rate without affecting the recovery of the water knife cutting waste tissue, has a clever structure design, and has an excellent treatment effect on liquid entrainment.

[0018] The present invention also provides a medical water knife having the above pressure reduction and flow rate reduction structure, and thus also has advantages such as a clever structure design and the ability to stably reduce the entrained flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the pressure reduction and flow rate reduction structure of some embodiments of the present invention;

[0020] Figure 2 It is an exploded structural view of the pressure reduction and flow rate reduction structure of some embodiments of the present invention;

[0021] Figure 3 It is a front sectional view of the pressure reduction and flow rate reduction structure of some embodiments of the present invention;

[0022] Figure 4 It is a top sectional view of the pressure reduction and flow rate reduction structure of some embodiments of the present invention;

[0023] Figure 5Schematic diagram of the reflux structure of the pressure reduction and flow reduction structure according to an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the reflux structure of the pressure reduction and flow reduction structure according to another embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the reflux structure of the pressure reduction and flow reduction structure according to still another embodiment of the present invention.

[0026] In the figure, 1 is a pressure pipe; 11 is a spray hole; 2 is an outer pipe; 3 is an inner pipe; 31 is a first part; 32 is a second part; 33 is a water outlet hole; 34 is a water inlet hole; 35 is a receiving hole; 4 is a flow channel. Detailed implementation manners

[0027] The following combines the accompanying drawings and embodiments to further describe in detail the detailed implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0028] It should be understood that in the present invention, terms such as "front" and "rear" are used to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "front" information can also be called "rear" information, and "rear" information can also be called "front" information.

[0029] As Figures 1 to 7 shown, the present invention provides a medical water knife with a pressure reduction and flow reduction structure. The pressure reduction and flow reduction structure thereof includes an inner pipe 3, an outer pipe 2, and a pressure pipe 1. The outer pipe 2 wraps the inner pipe 3 and forms a flow channel 4 therebetween. The pressure pipe 1 is disposed in the inner pipe 3 and is connected to the inner pipe 3. One end of the pressure pipe 1 extends outside the inner pipe 3 and is provided with a spray hole 11 facing the inner pipe. The pressure pipe 1 releases high-speed water flow into the inner pipe 3 through the spray hole 11. Further, the inner pipe 3 is provided with a receiving hole 35. The high-speed water flow flowing out from the spray hole 11 enters the inner pipe through the receiving hole 35. At the same time, the inner pipe 3 is also provided with a water outlet hole 33 and a water inlet hole 34 that communicate with the flow channel 4. The water inlet hole 34 is farther from the spray hole 11 than the water outlet hole 33. The water inlet hole 34, the flow channel 4, and the water outlet hole 33 cooperate to form a reflux channel, and the water flow in the rear section of the inner pipe 3 can continuously flow to the front section of the inner pipe 3 through the reflux channel.

[0030] Based on the above structure, when in use, high-speed water flow is released into the inner tube 3 and the outer tube 2 through the pressure tube 1. After flowing out along the spray holes 11, the high-speed water flow enters the inner tube 3 through the receiving holes 35. It can be found that based on the high-speed jet of the water flow, the water flow between the spray holes 11 and the receiving holes 35 can cut tissues. At this time, a working window is formed between the spray holes 11 and the receiving holes 35. Further, the speed of the water jet entering the inner tube 3 continuously decreases. The water jet at the front section of the inner tube 3 has a high speed and a small pressure, while the water jet at the rear section of the inner tube 3 has a low speed and a large pressure. The water jet at the front section of the inner tube 3 will form a negative pressure area due to the Venturi effect. The liquid entrainment effect in the negative pressure area will carry away more liquid from the liquid environment. To avoid this situation, the present application selects to provide water outlet holes 33 and water inlet holes 34 on the inner tube 3 to connect the flow channel 4 and the inner cavity of the inner tube 3. At this time, due to the flow rate difference and pressure difference between the water jets at the front section and the rear section of the inner tube 3, the water jet at the rear section of the inner tube 3 reaches the front section of the inner tube 3 through the water inlet hole 34, the flow channel 4 and the water outlet hole 33 due to the Venturi effect, further occupying the space at the front section of the inner tube 3, thereby greatly reducing the entrained flow rate of the water jet ejected from the spray holes 11, forming a stagnant flow effect on the environmental liquid, and reducing the environmental liquid replenishment flow rate. In this way, the present application utilizes the Venturi effect to improve the liquid entrainment situation caused by the Venturi effect, and reduces the flow rate without affecting the recovery of the water jet cutting waste tissues. Its structural design is ingenious and the treatment effect on liquid entrainment is excellent.

[0031] Optionally, as Figures 5 to 7 shown, for the inner tube 3 of the present application, multiple groups of water outlet holes 33 and water inlet holes 34 can be provided along the inner tube 3, and each group of water outlet holes 33 and water inlet holes 34 are respectively connected to the reflux channel to form multiple reflux channels. Based on the above structure, the design of multiple groups of water outlet holes 33 and water inlet holes 34 divides a single reflux channel into multiple reflux channels, and further changes the large circulation flow into a small circulation flow to achieve multi-stage step-by-step treatment.

[0032] Further, in some embodiments of the present application, the inner tube 3 includes a first part 31 and a second part 32 that are sequentially arranged and communicate with each other. The diameter of the first part 31 is smaller than that of the second part 32. A receiving hole 35 is opened at one end of the first part 31 away from the second part 32. The high-speed water flow ejected from the spray hole 11 enters the first part 31 through the receiving hole 35. The outer tube 2 is sleeved on the second part 32 and forms a flow channel 4 between the outer tube 2 and the first part 31. The water outlet hole 33 is provided on the first part 31, and the water inlet hole 34 is provided on the second part 32. Based on the above structure, this embodiment optimizes the structure of the inner tube 3 so that the second part 32 of it directly abuts against the outer tube 2, effectively reducing the assembly difficulty between the inner tube 3 and the outer tube 2. Correspondingly, since the flow channel 4 is located between the outer tube 2 and the first part 31, the water outlet hole 33 is provided on the first part 31, and the water inlet hole 34 is located on the second part 32.

[0033] In order to strengthen the reflux effect, in some embodiments of the present application, a plurality of water outlet holes 33 may be provided and evenly arranged circumferentially around the first part 31. Since the reflux channel needs to always maintain a symmetric distribution along the entire length for continuous and stable reflux of the water jet in the reflux channel to achieve the purpose of reducing the entrainment flow rate, the number of corresponding water inlet holes 34 is the same as that of the water outlet holes 33. At this time, each water inlet hole 34 is also evenly arranged circumferentially around the second part 32. When specifically referring to multiple groups of water outlet holes 33 and water inlet holes 34, symmetric arrangement is also required.

[0034] Optionally, in order to further clarify the structure of the medical water jet, the diameter of the spray hole 11 is defined as d. In some embodiments of the present application, the size of d is 0.01 mm to 9.5 mm.

[0035] Furthermore, the diameter of the pressure pipe 1 is defined as D. In some embodiments of the present application, the size of D is 0.08 mm to 25 mm.

[0036] Furthermore, since a working window is formed between the spray hole 11 and the receiving hole 35, the width of the working window is defined as b. In some embodiments of the present application, the size of b is 0.01 mm to 25 mm.

[0037] Furthermore, the cross-sectional width of the reflux channel is defined as s. In some embodiments of the present application, the size of s is 0.1 mm to 7.5 mm.

[0038] In summary, the present invention provides a pressure reduction and flow rate reduction structure, which includes an inner pipe 3, an outer pipe 2, and a pressure pipe 1. The outer pipe 2 wraps the inner pipe 3 and forms a flow channel 4 therebetween. The pressure pipe 1 is disposed in the inner pipe 3 and connected to the inner pipe 3. One end of the pressure pipe 1 extends outside the inner pipe 3 and is provided with a spray hole 11 facing the inner pipe. The pressure pipe 1 releases high-speed water flow into the inner pipe 3 through the spray hole 11. Further, the inner pipe 3 is provided with water outlet holes 33 and water inlet holes 34 communicating with the flow channel 4. The water inlet holes 34 are farther from the spray hole 11 than the water outlet holes 33. The water inlet holes 34, the flow channel 4, and the water outlet holes 33 cooperate to form a reflux channel, and the water flow in the rear section of the inner pipe 3 can continuously flow to the front section of the inner pipe 3 through the reflux channel. Compared with the prior art, this pressure reduction and flow rate reduction structure realizes the reduction of the entrainment flow rate by optimizing the structural design of the inner pipe 3 without changing the structure of the outer pipe 2 and without affecting the recovery of the waste tissue cut by the water jet. Its structural design is ingenious and effectively ensures the cutting effect of the medical water jet.

[0039] The present invention also provides a medical water jet having the above pressure reduction and flow rate reduction structure, so it also has the advantages of ingenious structural design and being able to stably reduce the entrainment flow rate.

[0040] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A pressure reducing and flow reducing structure, characterized in that, It includes an inner tube, an outer tube and a pressure tube. The outer tube wraps the inner tube and forms a flow channel therebetween. The pressure tube is disposed in the inner tube and connected to the inner tube. One end of the pressure tube extends outside the inner tube and is provided with a spray hole facing the inner tube. The pressure tube releases high-speed water flow to the inner tube through the spray hole; Wherein, the inner tube is provided with a water outlet hole and a water inlet hole communicating with the flow channel. The water inlet hole is farther from the spray hole than the water outlet hole. The water inlet hole, the flow channel and the water outlet hole cooperate to form a reflux channel, and the water flow in the rear section of the inner tube flows to the front section of the inner tube through the reflux channel.

2. The pressure reducing and flow reducing structure according to claim 1, characterized in that, Multiple groups of the water outlet holes and the water inlet holes are arranged along the inner tube, and each group of the water outlet holes and the water inlet holes are respectively communicated with the reflux channel to form multiple reflux channels.

3. The pressure reducing and flow reducing structure according to claim 1, characterized in that, The inner tube includes a first part and a second part which are arranged in sequence and communicated with each other. The diameter of the first part is smaller than that of the second part. A receiving hole is opened at one end of the first part away from the second part. The high-speed water flow sprayed by the spray hole enters the first part through the receiving hole. The outer tube is sleeved on the second part and forms the flow channel between the outer tube and the first part. The water outlet hole is disposed on the first part, and the water inlet hole is disposed on the second part.

4. The pressure reducing and flow reducing structure according to claim 3, characterized in that, A plurality of the water outlet holes are provided and are evenly arranged around the circumference of the first part.

5. The pressure reducing and flow reducing structure according to claim 3, characterized in that, A plurality of the water inlet holes are provided and are evenly arranged around the circumference of the second part.

6. The pressure reducing and flow reducing structure according to claim 3, characterized in that, The cross-sectional area of the receiving hole is 0.01 to 100 mm 2 .

7. The pressure reducing and flow reducing structure according to claim 1, characterized in that, The diameter d of the spray hole is 0.01 mm to 9.5 mm.

8. The pressure reducing and flow reducing structure according to claim 1, characterized in that, The diameter D of the pressure tube is 0.08 mm to 25 mm.

9. The pressure reducing and flow reducing structure according to claim 1, characterized in that, A working window is formed between the spray hole and the receiving hole, and the width b of the working window is 0.01 mm to 25 mm.

10. The pressure reducing and flow reducing structure according to claim 1, characterized in that, The cross-sectional width s of the flow channel is 0.1 mm to 7.5 mm.

11. A medical water jet, characterized in that, It includes the decompression and flow reduction structure according to any one of claims 1-10.

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