Disposable hemodialysis trocar

Abstract

The utility model discloses a disposable hemodialysis trocar, a puncture needle comprises a steel needle body, a needle handle containing a capsule cavity and a needle wing, the steel needle body is arranged in the needle handle containing the capsule cavity, and the needle wing is arranged on the outer side of the needle handle containing the capsule cavity. The puncture needle further comprises a bag cavity arranged in the needle handle containing the bag cavity, a moving part used for moving the steel needle body is arranged on the bag cavity, the steel needle body retreats into the bag cavity through the moving part, and the phenomenon that foreign matter such as hyperplastic tissue and blood scab is brought in due to puncture of the steel needle is avoided. The problem that foreign matter between a blood vessel and a puncture point possibly enters the blood vessel due to a common puncture steel needle, and consequently vascular embolism of a patient is caused is solved.

Description

Technical Field

[0001] The invention belongs to the field of medical consumables, and in particular relates to a disposable hemodialysis trocar. Background Art

[0002] For patients who use fistulas for regular hemodialysis treatment, currently disposable dialysis puncture needles are commonly used, and the needles include blunt needles and sharp needles. For patients whose puncture tunnels have not yet been formed, disposable dialysis puncture needles are currently used, and the steel needles are sharper. For patients whose puncture tunnels have already been formed, disposable dialysis puncture blunt needles with blunter steel needles are generally used. (For some patients, due to different punctures and the patient's own tissue recovery conditions, the tissue hyperplasia between the puncture point and the blood vessel to varying degrees makes blunt needle puncture difficult, and repeated punctures are prone to form false tunnels, so sharp needles with sharper steel needles are used for puncture). In clinic, some patients may experience bleeding at the puncture point during and after treatment. This is also common for patients with tunnels that have been formed. In this case, we know that blood clots will accumulate in the tunnel. At the same time, in clinic, for some patients with false tunnels, the needle tip will cut the tissue in the tunnel during repeated punctures. We see that the patient will have a strong sense of pain, and blood will seep out of the tunnel (possibly because the capillaries of the local tissue of the tunnel are cut). When the patient performs subsequent punctures, if an ordinary disposable dialysis puncture needle is used, these blood clots will enter the patient's blood vessels. Therefore, whether the current ordinary disposable puncture sharp needle or blunt needle is used, the patient's blood clots and self-tissue may be brought into the patient's blood vessels. We know that foreign matter that enters the blood vessels may accumulate in the patient's systemic blood vessels along with the patient's blood flow, causing blockage of the blood vessels and causing other diseases. Summary of the invention

[0003] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a disposable hemodialysis trocar, the trocar comprising a steel needle body, a needle handle containing a cystic cavity and needle wings, the steel needle body being arranged in the needle handle containing the cystic cavity, the needle wings being arranged on the outside of the needle handle containing the cystic cavity, the trocar also comprising a cystic cavity arranged inside the needle handle containing the cystic cavity, and the cystic cavity being provided with a moving component for moving the steel needle body.

[0004] Based on the above technical solution, the steel needle body is retracted into the cyst cavity through the moving parts, so as to avoid the steel needle bringing in foreign matter such as hyperplastic tissue and blood scab due to puncture, and to prevent foreign matter between the blood vessel and the puncture point which may be caused by ordinary puncture steel needles from entering the blood vessel, thereby causing problems such as vascular embolism in patients.

[0005] As an improvement of the present invention, the bottom end of the steel needle body is inserted into the sac cavity, and the length of the sac cavity accommodates the length of the steel needle body.

[0006] Based on the above technical solution, in this solution, the steel needle body can be completely retracted into the sac cavity, and the sac cavity is used to accommodate the steel needle body.

[0007] As an improvement of the present utility model, the moving component includes a U-shaped slide arranged on the sac cavity and a slider arranged on the steel needle body, the slide is provided with a head bending portion, a sliding portion and a terminal bending portion, when the overlap between the steel needle body and the sac cavity is minimal, the slider is arranged in the head bending portion, and when the overlap between the steel needle body and the sac cavity is maximal, the slider is arranged at the terminal bending portion.

[0008] Based on the above technical solution, the head bending portion and the tail bending portion are used to longitudinally fix the position of the steel needle body.

[0009] As an improvement of the utility model, a first sealing plug and a second sealing plug are arranged inside the head end of the sac cavity, the first sealing plug and the second sealing plug are elastic sealing plugs, and a gap is arranged between the first sealing plug and the second sealing plug, and when the steel needle body is completely moved into the sac cavity, the end of the steel needle body is in the gap.

[0010] Based on the above technical solution, the first sealing plug is made of a fast-rebound sealing material. The function of the first sealing plug is to seal the end of the steel needle in the sac cavity. A closed space is formed between the first sealing plug and the second sealing plug to prevent blood from seeping out of the steel needle body.

[0011] As an improvement of the utility model, a first air-permeable and liquid-impermeable membrane is provided at the end of the steel needle body.

[0012] Based on the above technical solution, the function of the first air-permeable and liquid-tight membrane is to seal the blood in the steel needle. The filter mesh integrated with the steel needle before this membrane is to block blood scabs and foreign matter to prevent them from directly contacting the first air-permeable and liquid-tight membrane. (The first air-permeable and liquid-tight membrane and the filter mesh integrated with the steel needle here jointly complete the function of sealing the blood and blood scabs, subcutaneous tissue and other foreign matter in the steel needle.) When the steel needle punctures, the air in the steel needle will pass through this membrane and overflow from the slide of the cyst cavity. The air-permeable and liquid-tight membrane here allows blood and foreign matter to enter the steel needle more smoothly and be contained. However, we know that foreign tissues such as blood scabs enter the steel needle structure together. Foreign tissues such as blood scabs belong to a harder structure and need to prevent the membrane from rupturing when they enter the steel needle. If this happens, blood will flow out through the end of the steel needle and the slide. Therefore, a hard filter mesh or porous material is needed before this membrane to prevent blood scabs and foreign matter from directly contacting this air-permeable and liquid-tight membrane.

[0013] As an improvement of the utility model, a convex section is provided on the needle handle containing a cystic cavity, and the convex section is arranged at the position of the needle handle containing a cystic cavity corresponding to the cystic cavity, and the cross-section of the needle handle containing a cystic cavity at the position of the convex section is elliptical.

[0014] Based on the above technical solution, the cross-section of the needle handle containing the capsule cavity at the position of the raised section is elliptical. The purpose of the elliptical cross-section is to increase the blood flow channel of the cross-section. Because the capsule cavity for accommodating the steel needle will cause blood flow restriction, the purpose of making the elliptical cross-section is to allow blood to flow from both ends of the capsule cavity.

[0015] As an improvement of the utility model, the end of the needle handle containing the sac cavity is also provided with a first threaded structure and a clip, and the end of the needle handle containing the sac cavity is also provided with a second threaded structure and a second air-permeable and liquid-impermeable membrane, and the second threaded structure and the second air-permeable and liquid-impermeable membrane are arranged below the first threaded structure.

[0016] Based on the above technical solution, the function of the first threaded structure is to connect with the arterial end of the hemodialysis circuit after the puncture is completed, so that the blood can enter the dialysis circuit. The second threaded structure fits with the nipple end on the syringe. This structure is used to push physiological saline and drugs. The second air-permeable and liquid-tight membrane is also used to detect whether the steel needle is in the blood vessel. If it is in the blood vessel, the blood will flow out along the hose. When the blood flows out, we can clamp the clamp. The clamp set at the front end of the structure can be clamped before the blood flows to the device, and then the syringe is connected from the interface of the second thread to push the liquid medicine. This can avoid the rupture of the membrane due to excessive pressure when injecting the liquid medicine.

[0017] As an improvement of the utility model, the front end of the needle handle containing the capsule cavity is also provided with a hole structure.

[0018] Based on the above technical solution, the function of the hole structure is to increase the flow rate at the end of the needle handle containing the sac cavity.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: first, compared with ordinary disposable dialysis puncture needles, the hose structure of the present invention causes less damage to blood vessels, and is less likely to cause blood vessel puncture and hematoma than steel needles. At the same time, it can increase the patient's puncture limb mobility. Secondly, because its steel needle structure can accommodate blood scabs and hyperplastic tissue, it can prevent blood scabs and foreign matter from entering the patient's blood vessels and causing other related diseases, thus benefiting the patient. Thirdly, after the treatment is completed, it is only necessary to pull out the cannula in the blood vessel to compress and stop the bleeding, thus avoiding needlestick injuries caused by contact with the puncture steel needle by the nurse. Finally, our solution is simple and can benefit patients. The present invention can solve the problem that when hemodialysis patients use ordinary puncture needles for blood vessel puncture, the steel needle brings in hyperplastic tissue, blood scabs and other foreign matter due to puncture, and prevents foreign matter between the blood vessel and the puncture point caused by ordinary puncture steel needles from entering the blood vessel, thereby causing vascular embolism in the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the trocar structure in this embodiment;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a comparison diagram of the cross section of the trocar in this embodiment and the cross section of a traditional puncture needle.

[0023] List of figure symbols: 1-steel needle body, 2-first air-permeable and liquid-tight membrane, 3-slider, 4-cyst cavity, 5-slide, 6-first sealing plug, 7-hole, 8-needle handle containing the cyst cavity, 9-clip, 10-first threaded structure, 11-second air-permeable and liquid-tight membrane, 12-second threaded structure, 13-needle wing, 14-second sealing plug, 15-end bending part, 16-skin surface, 17-traditional needle handle, 18-first filter structure, 19-second filter structure. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0025] Example: Figure 1-3As shown, this embodiment is a disposable hemodialysis trocar, the trocar includes a steel needle body, a needle handle containing a cystic cavity, and a needle wing, the steel needle body is arranged in the needle handle containing the cystic cavity, the needle wing is arranged outside the needle handle containing the cystic cavity, the trocar also includes a cystic cavity arranged inside the needle handle containing the cystic cavity, and the cystic cavity is provided with a moving part for moving the steel needle body. The steel needle body is retracted into the cystic cavity by the moving part, so as to avoid the steel needle bringing in foreign matter such as hyperplastic tissue and blood scab due to puncture, and to prevent foreign matter between the blood vessel and the puncture point caused by ordinary puncture steel needles from entering the blood vessel, thereby causing problems such as vascular embolism in patients.

[0026] As an improvement of this embodiment, the bottom end of the steel needle body is inserted into the sac cavity, and the length of the sac cavity is greater than the length of the steel needle body. In this solution, the steel needle body can be completely retracted into the sac cavity, and the sac cavity is used to accommodate the steel needle body.

[0027] As an improvement of this embodiment, the moving part includes a U-shaped slideway arranged on the capsule cavity and a slider arranged on the steel needle body, the slideway is provided with a head bending portion, a sliding portion and a terminal bending portion, when the overlap between the steel needle body and the capsule cavity is minimal, the slider is arranged in the head bending portion, and when the overlap between the steel needle body and the capsule cavity is maximal, the slider is arranged at the terminal bending portion. The head bending portion and the terminal bending portion are used to fix the position of the steel needle body longitudinally.

[0028] As an improvement of this embodiment, a first sealing plug and a second sealing plug are provided inside the head end of the sac cavity, the first sealing plug and the second sealing plug are elastic sealing plugs, a gap is provided between the first sealing plug and the second sealing plug, and when the steel needle body is completely moved into the sac cavity, the end of the steel needle body is in the gap. The first sealing plug is made of a fast-rebound sealing material, and the function of the first sealing plug is to seal the end of the steel needle in the sac cavity, and a closed space is formed between the first sealing plug and the second sealing plug to prevent blood from seeping out of the steel needle body.

[0029] As an improvement of this embodiment, a first air-permeable and liquid-impermeable membrane is provided at the end of the steel needle body. The function of the first air-permeable and liquid-impermeable membrane is to seal the blood in the steel needle. The filter screen integrated with the steel needle before this membrane is to block blood scabs and foreign objects and prevent them from directly contacting the first air-permeable and liquid-impermeable membrane (the first air-permeable and liquid-impermeable membrane and the filter screen integrated with the steel needle here jointly complete the function of sealing the blood and blood scabs, subcutaneous tissue and other foreign objects in the steel needle). When the steel needle punctures, the air in the steel needle will pass through this membrane and overflow from the slide of the capsule cavity. The air-permeable and liquid-impermeable membrane here allows blood and foreign objects to enter the steel needle more smoothly and be contained. However, we know that foreign tissues such as blood scabs enter the steel needle structure together. Foreign tissues such as blood scabs belong to a relatively hard structure and need to prevent the membrane from rupture when they enter the steel needle. If this happens, blood will flow out through the end of the steel needle and the slide. Therefore, a hard filter screen or porous material is needed before this membrane to prevent blood scabs and foreign objects from directly contacting this air-permeable and liquid-impermeable membrane.

[0030] As an improvement of this embodiment, a convex section is provided on the needle handle containing the cystic cavity, and the convex section is provided at the position of the needle handle containing the cystic cavity corresponding to the cystic cavity, and the cross section of the needle handle containing the cystic cavity at the position of the convex section is elliptical. The cross section of the needle handle containing the cystic cavity at the position of the convex section is elliptical, and the elliptical cross section is intended to increase the blood flow channel of the cross section, because the cystic cavity set to accommodate the steel needle will lead to blood flow restriction, and the purpose of making the elliptical cross section is to allow blood flow to flow from both ends of the cystic cavity.

[0031] As an improvement of this embodiment, the end of the needle handle containing the cystic cavity is also provided with a first thread structure and a clamp, and the end of the needle handle containing the cystic cavity is also provided with a second thread structure and a second air-permeable and liquid-impermeable membrane, and the second thread structure and the second air-permeable and liquid-impermeable membrane are arranged below the first thread structure. The function of the first thread structure is to connect with the arterial end of the hemodialysis pipeline after the puncture is completed, so that the blood enters the dialysis pipeline; the second thread structure fits with the nipple end on the syringe, and this structure is used to push physiological saline and drugs; the second air-permeable and liquid-impermeable membrane is also used to detect whether the steel needle is in the blood vessel. If it is in the blood vessel, the blood will flow out along the hose. When the blood flows out, we can clamp the clamp. The second air-permeable and liquid-impermeable membrane 11 structure is an air removal component. After the puncture is successful, the blood will flow out through the hose at the needle handle. When the blood encounters the air removal component, the blood flow will automatically stop, which can serve the purpose of removing the air in the hose and can also help determine whether the puncture needle is in the blood vessel.

[0032] As an improvement of the present embodiment, it is necessary to add a clamp at a position above the second air-permeable and liquid-tight membrane 11 and below the second threaded structure 12. The front end of the second air-permeable and liquid-tight membrane 11 is provided with a hard structure with holes, specifically a second filter structure integrated with the inside of the steel needle. The filter structures at these two places are the same, but the materials can be different. The filter integrated with the steel needle can be set as a dense stainless steel filter structure, because this maximizes the use of the space inside the steel needle to accommodate foreign matter. A plastic filter can be used at the front end of the second air-permeable and liquid-tight membrane. After the steel needle enters the blood vessel, if the two clamps are not clamped, the blood will automatically flow out and discharge the gas in the pipeline. The function of the filter here is the same as that of the filter inside the steel needle. The dense filter can play a certain protective role on the membrane and is not easy to break.

[0033] The front end of the first air-permeable and liquid-tight membrane 2 is also provided with a first filter structure with a hard structure having holes. The filter structure here is the filter at the tail end of the steel needle in the first air-permeable and liquid-tight membrane 2 component. When the steel needle punctures into the patient's blood vessel, blood scab and hyperplastic tissue will enter the inside of the steel needle. If the pressure in the blood vessel is too high at this time and there is no filter structure, the blood scab and hyperplastic tissue will directly contact the air-permeable and liquid-tight membrane, which may easily cause the membrane to rupture, thereby causing blood to leak out from the tail end of the steel needle and then flow out through the track open to the outside world, so that after the puncture is successful, the blood will flow out through the puncture needle, and the blood flow will stop when the puncture needle encounters this layer of membrane.

[0034] As an improvement of this embodiment, the front end of the needle handle containing the cystic cavity is further provided with a hole structure, which functions to increase the flow rate at the end of the needle handle containing the cystic cavity.

[0035] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A disposable hemodialysis cannula needle, characterized in that: The trocar includes a steel needle body, a needle handle containing a sac cavity, and needle wings. The steel needle body is arranged in the needle handle containing the sac cavity, and the needle wings are arranged on the outside of the needle handle containing the sac cavity. The trocar also includes a sac cavity arranged inside the needle handle containing the sac cavity, and a moving part for moving the steel needle body is arranged on the sac cavity.

2. A disposable hemodialysis cannula needle according to claim 1, characterized in that: The bottom end of the steel needle body is inserted into the sac cavity, and the length of the sac cavity accommodates the length of the steel needle body.

3. A disposable hemodialysis trocar needle according to claim 1, characterized in that: The moving part includes a U-shaped slide arranged on the sac cavity and a slider arranged on the steel needle body. The slide is provided with a head bending portion, a sliding portion and a terminal bending portion. When the overlap between the steel needle body and the sac cavity is minimal, the slider is arranged in the head bending portion. When the overlap between the steel needle body and the sac cavity is maximal, the slider is arranged at the terminal bending portion.

4. A disposable hemodialysis trocar according to claim 1, characterized in that: A first sealing plug and a second sealing plug are arranged inside the head end of the sac cavity, wherein the first sealing plug is an elastic sealing plug, and a gap is arranged between the first sealing plug and the second sealing plug. When the steel needle body is completely moved into the sac cavity, the end of the steel needle body is located in the gap.

5. A disposable hemodialysis cannula needle according to claim 1, characterized in that: The end of the steel needle body is provided with a first air-permeable and liquid-impermeable membrane.

6. A disposable hemodialysis trocar needle according to claim 1, characterized in that: The needle handle containing the cystic cavity is provided with a convex section, which is arranged at the position of the needle handle containing the cystic cavity corresponding to the cystic cavity, and the cross-section of the needle handle containing the cystic cavity at the position of the convex section is elliptical.

7. A disposable hemodialysis trocar needle according to claim 1, characterized in that: The end of the needle handle containing the sac cavity is also provided with a first thread structure and a clamp, and the end of the needle handle containing the sac cavity is also provided with a second thread structure and a second air-permeable and liquid-impermeable membrane, and the second thread structure and the second air-permeable and liquid-impermeable membrane are arranged below the first thread structure.

8. The disposable hemodialysis trocar needle according to claim 1, characterized in that: The front end of the needle handle containing the capsule cavity is also provided with a hole structure.

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