PICC adjustable skin expanding needle

Abstract

The utility model relates to the technical field of medical instruments, and discloses a PICC adjustable skin expanding needle which comprises a needle body, the needle body comprises a needle point, a sliding piece is assembled on the needle body in a sliding mode, a limiting protruding block is arranged at the bottom of the sliding piece, a locking column is arranged on the limiting protruding block, a movable column is arranged on the locking column, a limiting piece is arranged on the movable column, and a through hole is formed in the middle of the sliding piece. Transverse compression gaps are formed in the locking column, the movable column and the limiting piece, an embedding groove is formed in the locking column, the movable column is sleeved with a buckling piece, and a wedge-shaped embedding block is arranged in the buckling piece. The diameter of the through hole is larger than that of the needle body. The embedding groove is located in the vertical direction of the compression gap. The side face of the limiting protruding block is in a circular arc shape. The device has the advantages that the position of the limiter is adjusted according to the subcutaneous fat thickness prompted by B-ultrasonic, and a better puncture effect is achieved for different patients.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a PICC adjustable skin dilating needle. Background Technique

[0002] In the late 1990s, the improved Seldinger puncture technique under ultrasound guidance emerged in China and has been effectively applied in clinical practice. The traditional PICC catheterization technique is easily restricted by various factors, while the improved Seldinger puncture catheterization under ultrasound guidance can effectively break through the conditional restrictions, improve the success rate of one-time puncture, and have fewer complications. During the operation of this technique, first, under ultrasound guidance, the best puncture point is found, the probe position is fixed, perpendicular to the patient's skin, hold the puncture needle, position the puncture angle, generally between 30° and 45°, insert the puncture needle into the skin, quickly fix the puncture needle after confirming the puncture is correct, and send the guide wire into the puncture site, gently press the puncture point, fix the guide wire and then pull out the puncture needle. Then use anesthetic drugs to anesthetize the edge part of the puncture point, use a skin dilator to dilate the skin, and send the intubation sheath along the guide wire into the intubation, evacuate the dilating device and the guide wire, and separate the cannula.

[0003] In a PICC limit skin dilating needle with the patent number CN202121236698.9, in order to ensure the uniformity of the size and depth of the skin dilation opening, the depth of the needle body inserted into the skin is restricted by the limit bump on the needle body. However, when facing different patients, due to the different subcutaneous fat thicknesses of the patients, completely unifying the insertion depth cannot play its due role for all patients. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the utility model provides a PICC adjustable skin dilating needle, which has the advantages of being able to adjust the position of the limiter according to the subcutaneous fat thickness prompted by B-ultrasound and achieving better puncture effects for different patients, and solves the problem that when facing different patients, due to the different subcutaneous fat thicknesses of the patients, completely unifying the insertion depth cannot play its due role for all patients.

[0006] (2) Technical Solutions

[0007] To achieve the above object of adjusting the position of the limiter according to the subcutaneous fat thickness prompted by B-ultrasound and achieving a better puncture effect for different patients, the present utility model provides the following technical solutions: A PICC adjustable skin dilating needle, comprising a needle body, the needle body includes a needle tip, a sliding member is slidably assembled on the needle body, the bottom of the sliding member is a limiting convex block, a locking column is arranged on the limiting convex block, a movable column is arranged on the locking column, a limiting piece is arranged on the movable column, a through hole is arranged in the middle of the sliding member, a horizontally penetrating compression gap is arranged on the locking column, the movable column and the limiting piece, a fitting groove is arranged on the locking column, a fastening member is sleeved on the movable column, and a wedge-shaped fitting block is arranged inside the fastening member.

[0008] Preferably, the diameter of the through hole is larger than the diameter of the needle body.

[0009] Preferably, the fitting groove is located in the vertical direction of the compression gap.

[0010] Preferably, the number of the wedge-shaped fitting blocks is the same as the number of the fitting grooves.

[0011] Preferably, the end of the wedge-shaped fitting block close to the locking column is a narrow head, and the end of the wedge-shaped fitting block far from the locking column is a wide head.

[0012] Preferably, the side surface of the limiting convex block is arc-shaped.

[0013] Preferably, a cutting surface is arranged at the needle tip.

[0014] Preferably, a first fitting surface is arranged on one side of the sliding member.

[0015] Preferably, a second fitting surface is arranged on one side of the fastening member.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a PICC adjustable skin dilating needle, which has the following beneficial effects: The PICC adjustable skin dilating needle uses the cooperation of the needle body, the sliding member and the fastening member. Perform B-ultrasound detection at the position to be punctured to obtain the subcutaneous fat thickness of the patient at the puncture point, and then adjust the distance between the limiting convex block and the needle tip according to the subcutaneous fat thickness of the patient. First, in the initial state, the fastening member is located on the movable column. At this time, since the diameter of the through hole is slightly larger than the diameter of the needle body, the sliding member can be slid to the corresponding position according to the subcutaneous fat thickness, so that the distance between the needle tip and the limiting convex block can penetrate the fat layer of the patient. After the position of the sliding member is adjusted, align the wedge-shaped fitting block of the fastening member with the fitting groove, and push the fastening member downward. The wedge-shaped fitting block will generate an inward squeezing force on the fitting groove, so that the compression gap is reduced, and further the sliding member is pressed tightly on the needle body, thus completing the position locking of the limiting convex block. In addition, when the sliding member and the fastening member are fastened, it should be ensured that the first fitting surface and the second fitting surface are on the other side of the section. At this time, when looking at the needle body from the side, the side of the needle body opposite to the section should tend to be flat. In this way, when the needle body is inserted into the patient's skin, the needle body on the other side of the section can be closely attached to the patient's skin without obstacles blocking, ensuring the stability during insertion. Thus, the position of the limiter is adjusted according to the subcutaneous fat thickness prompted by B-ultrasound, and better puncture effects are achieved for different patients. Description of the Drawings

[0018] Figure 1 Schematic structural diagram of the PICC adjustable skin dilating needle of the utility model;

[0019] Figure 2 Side view of the PICC adjustable skin dilating needle of the utility model;

[0020] Figure 3 Enlarged schematic diagram of the structure at A of the PICC adjustable skin dilating needle of the utility model;

[0021] Figure 4 Schematic structural diagram of the sliding member of the PICC adjustable skin dilating needle of the utility model;

[0022] Figure 5 Schematic structural diagram of the fastening member of the PICC adjustable skin dilating needle of the utility model.

[0023] In the figure: 1 needle body, 11 needle tip, 12 section, 2 sliding member, 21 limiting convex block, 22 locking column, 221 fitting groove, 23 movable column, 24 limiting piece, 25 through hole, 26 compression gap, 27 first fitting surface, 3 fastening member, 31 wedge-shaped fitting block, 32 second fitting surface. Detailed Embodiment

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1-5 , the PICC adjustable skin-expanding needle, including a needle body 1, the needle body 1 includes a needle tip 11. The needle body 1 serves as the main puncture tool for performing puncture operations on patients. It includes a needle tip 11 for penetrating the skin and tissues.

[0026] A sliding member 2 is slidably assembled on the needle body 1. The bottom of the sliding member 2 is a limiting convex block 21. A locking column 22 is provided on the limiting convex block 21. An active column 23 is provided on the locking column 22. A limiting piece 24 is provided on the active column 23. A through hole 25 is provided in the middle of the sliding member 2. Transverse compression gaps 26 are provided on the locking column 22, the active column 23 and the limiting piece 24. A fitting groove 221 is provided on the locking column 22. A fastening member 3 is sleeved on the active column 23. A wedge-shaped fitting block 31 is provided inside the fastening member 3. The sliding member 2 allows adjusting the distance between the needle tip 11 and the skin surface according to the subcutaneous fat thickness of the patient, that is, adjusting the puncture depth. The bottom is a limiting convex block 21 for limiting the penetration depth of the needle tip 11; a through hole 25 is provided in the middle for accommodating the needle body 1; it adapts to different subcutaneous fat thicknesses by sliding. The limiting convex block 21 ensures that the needle tip 11 will not penetrate further after penetrating the skin, thus avoiding damage to deep tissues or blood vessels. The locking column 22 provides a platform for interacting with the active column 23 and the fastening member 3 to lock the position of the sliding member 2. The fitting groove 221 is provided on the locking column 22 for cooperating with the wedge-shaped fitting block 31 of the fastening member 3. The active column 23 connects the locking column 22 and the limiting piece 24 and allows it to be compressed and locked by the fastening member 3. And when in the locked state, the fastening member 3 can be sleeved on the upper part to prevent loss. Together with the locking column 22 and the limiting piece 24, the position of the sliding member 2 is fixed by the contraction of the compression gap 26. The limiting piece 24 serves as the termination point of the sliding member 2 and the adjustment mechanism, ensuring that the sliding member 2 will not slide out of the allowed range. Working together with the active column 23 and the locking column 22, it ensures the safety and stability of the sliding member 2. The fastening member 3 locks the position of the sliding member 2 through the cooperation of the wedge-shaped fitting block 31 inside it and the fitting groove 221. It is sleeved on the active column 23. By pushing the fastening member 3, the compression gap 26 is compressed, so that the surface of the through hole 25 can firmly press against the needle body 1 to fix the sliding member 2.

[0027] The diameter of the through hole 25 is larger than the diameter of the needle body 1. The through hole 25 allows the needle body 1 to pass through the sliding member 2 and at the same time allows the sliding member 2 to slide on the needle body 1. The diameter is larger than that of the needle body 1 to allow the sliding member 2 to slide freely on the needle body 1.

[0028] The fitting groove 221 is located in the vertical direction of the compression gap 26. The number of the wedge-shaped fitting blocks 31 is the same as the number of the fitting grooves 221. The fitting groove 221 cooperates with the wedge-shaped fitting blocks 31 of the fastening member 3 to lock the position of the sliding member 2. It is located in the vertical direction of the compression gap 26, which is convenient for cooperating with the wedge-shaped fitting blocks 31.

[0029] One end of the wedge-shaped fitting block 31 close to the locking column 22 is a narrow head, and one end of the wedge-shaped fitting block 31 away from the locking column 22 is a wide head. The wedge-shaped fitting block 31 cooperates with the fitting groove 221. When the fastening member 3 is pushed, the wedge-shaped fitting block 31 will force the compression gap 26 to contract, thereby locking the sliding member 2. The number is the same as that of the fitting grooves 221 to ensure stable locking; one end close to the locking column 22 is a narrow head, and one end away from the locking column 22 is a wide head, which is convenient for cooperating with the fitting groove 221 and generating a compression force.

[0030] The side surface of the limit convex block 21 is arc-shaped. The side surface of the limit convex block 21 being arc-shaped can help reduce the friction and damage to the patient's tissue.

[0031] A cutting surface 12 is provided at the needle tip 11. A first fitting surface 27 is provided on one side of the sliding member 2, and a second fitting surface 32 is provided on one side of the fastening member 3. After the sliding member 2 and the fastening member 3 are installed on the needle body 1, it should be ensured that the first fitting surface 27 and the second fitting surface 32 are located on the other side of the cutting surface 12. At this time, when looking at the needle body 1 from the side, the side of the needle body 1 opposite to the cutting surface 12 should tend to be flat. In this way, when the needle body 1 is inserted into the patient's skin, the needle body 1 on the other side of the cutting surface 12 can closely adhere to the patient's skin without any obstacles blocking, ensuring the stability during insertion.

[0032] Scales are also provided on the surface of the needle body 1. When performing puncture, the doctor adjusts the distance between the limit convex block 21 and the needle tip 11 to this value according to the thickness of the patient's subcutaneous fat detected by B-ultrasound, and then performs puncture, which is beneficial for the doctor to more accurately control the puncture depth.

[0033] Working principle: Perform B-ultrasound detection at the position where puncture is required to obtain the subcutaneous fat thickness of the patient at the puncture point, and then adjust the distance between the limit bump 21 and the needle tip 11 according to the subcutaneous fat thickness of the patient. First, in the initial state, the fastening member 3 is located on the movable column 23. At this time, since the diameter of the through hole 25 is slightly larger than the diameter of the needle body 1, the sliding member 2 can be slid to the corresponding position according to the subcutaneous fat thickness, so that the distance between the needle tip 11 and the limit bump 21 can penetrate the fat layer of the patient. After the position of the sliding member 2 is adjusted, align the wedge-shaped fitting block 31 of the fastening member 3 with the fitting groove 221, and push the fastening member 3 downward. The wedge-shaped fitting block 31 will generate an inward squeezing force on the fitting groove 221, so that the compression gap 26 is reduced, and further the sliding member 2 is pressed tightly on the needle body 1, thereby completing the position locking of the limit bump 21. In addition, when the sliding member 2 and the fastening member 3 are fastened, it should be ensured that the first fitting surface 27 and the second fitting surface 32 are on the other side of the section plane 12. At this time, when looking at the needle body 1 from the side, the side of the needle body 1 opposite to the section plane 12 should tend to be flat. In this way, when the needle body 1 is inserted into the patient's skin, the needle body 1 on the other side of the section plane 12 can be closely attached to the patient's skin without any obstacles blocking, ensuring the stability during insertion. Thus, it is achieved to adjust the position of the limiter according to the subcutaneous fat thickness prompted by B-ultrasound, and better puncture effects can be achieved for different patients.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. PICC adjustable skin dilation needle, characterized by: The invention comprises a needle body (1), wherein the needle body (1) comprises a needle tip (11), a sliding member (2) is slidably mounted on the needle body (1), the bottom of the sliding member (2) is a limiting protrusion (21), a locking column (22) is arranged on the limiting protrusion (21), a movable column (23) is arranged on the locking column (22), a limiting plate (24) is arranged on the movable column (23), a through hole (25) is arranged in the middle of the sliding member (2), a compression gap (26) is arranged on the locking column (22), the movable column (23) and the limiting plate (24), an engaging groove (221) is arranged on the locking column (22), a buckling member (3) is sleeved on the movable column (23), and a wedge-shaped engaging block (31) is arranged inside the buckling member (3).

2. The PICC adjustable skin dilation needle according to claim 1, characterized in that: The diameter of the through hole (25) is greater than the diameter of the needle body (1).

3. The PICC adjustable skin dilation needle according to claim 1, characterized in that: The engaging groove (221) is located in the vertical direction of the compression gap (26).

4. The PICC adjustable skin dilation needle according to claim 1, characterized in that: The number of the wedge-shaped engaging blocks (31) is the same as the number of the engaging grooves (221).

5. The PICC adjustable skin dilation needle according to claim 4, characterized in that: The end of the wedge-shaped engaging block (31) close to the locking column (22) is a narrow head, and the end of the wedge-shaped engaging block (31) away from the locking column (22) is a wide head.

6. The PICC adjustable skin dilation needle according to claim 1, characterized in that: The side surface of the limiting protrusion (21) is arc-shaped.

7. The PICC adjustable skin dilation needle according to claim 1, characterized in that: A cutting surface (12) is provided at the needle tip (11).

8. The PICC adjustable skin dilation needle according to claim 7, characterized in that: A fitting surface (27) is provided on one side of the sliding member (2).

9. The PICC adjustable skin dilation needle according to claim 7, characterized in that: A second fitting surface (32) is provided on one side of the fastening member (3).

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