Deep venous catheter tip sampler

Abstract

A deep venous catheter tip sampler relates to the technical field of medical instruments and is mainly structurally characterized in that an inner tube is slidably sleeved in an outer tube, axial notches are formed in the tube wall and are aligned, a catheter clamping component is arranged on the left portion of the inner tube, and a catheter shearing component is arranged on the right portion of the outer tube. The device is convenient to operate by a single person, an operator pulls out the deep venous catheter in the body of a patient with one hand and presses the embedded part of the deep venous catheter with the other hand to stop bleeding, and meanwhile, the operator can use the catheter shearing assembly to shear the tip of the needed deep venous catheter according to needs; and the possibility of hematoma of a puncture point of a patient, injury of an operator and pollution of the tip of the catheter caused by problems such as personnel cooperation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a deep vein catheter tip sampler. Background Art

[0002] Deep vein catheterization is mainly applied to patients who need long-term or large amounts of intravenous medications. Such patients may develop vessel catheter associated infection (VCAI). Vessel catheter associated infection refers to the primary infection that occurs during the period of indwelling a vascular catheter and within 48 hours after the removal of the vascular catheter, and is unrelated to infections in other parts, including local infection associated with the vascular catheter and bloodstream infection. When a patient has a local infection, there are inflammatory manifestations such as redness, swelling, heat, pain, and exudation. In addition to local manifestations, bloodstream infection will also show systemic infection manifestations such as fever (>38°C), chills, or hypotension. The laboratory microbiological examination results of bloodstream infection: bacteria or fungi are positive in the peripheral venous blood culture, or the same type of pathogenic bacteria with the same drug sensitivity results are cultured from the catheter tip and peripheral blood. When replacing or removing the indwelling catheter, it is necessary to sample the catheter tip for microbial culture to guide subsequent treatment.

[0003] Currently, when clinical medical staff perform tip sampling, the operator needs to pull out the catheter with one hand and press the puncture site with the other hand, while holding the catheter with the other hand to let the assistant cut the catheter tip, or hand the catheter to the assistant for cutting. This process may cause harm to the operator or contamination of the catheter due to problems with personnel cooperation. If different personnel perform the operation, the assistant uses a gauze to compress and stop bleeding at the puncture site, and the operator cuts the tip. This process may cause a hematoma at the puncture site due to problems with personnel cooperation, causing further harm to the patient.

[0004] Some existing catheter cutting devices do not consider the possibility of poor compression hemostasis at the puncture site caused by changing the operator for cutting. There are problems such as large device volume, the need for disinfection, cumbersome operation processes, and the catheter being easily contaminated during the installation process. There are also some devices with complex mechanical structures that cannot complete the integration of catheter removal, compression hemostasis, and cutting. One hand needs to hold the catheter, and the other hand needs to perform the cutting, which may cause problems such as hematoma or contamination. Summary of the Invention

[0005] The purpose of the present invention is to provide a deep vein catheter tip sampler with a simple and convenient operation process, which is convenient for single-person operation. The operator can pull out the deep vein catheter in the patient's body with one hand, press the hemostasis at the site where the deep vein catheter is inserted with the other hand, and at the same time, the operator can use the catheter cutting assembly to cut the required deep vein catheter tip as needed, reducing the possibility of hematoma at the patient's puncture site, injury to the operator, and contamination of the catheter tip caused by problems such as personnel cooperation.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A deep vein catheter tip sampler, comprising an inner tube, an outer tube, a catheter clamping assembly, and a catheter shearing assembly, wherein:

[0007] The inner tube is slidably sleeved inside the outer tube. Axial notches are provided on the tube walls of both the inner tube and the outer tube and are aligned. The length of the inner tube is greater than the length of the outer tube;

[0008] A catheter clamping assembly is provided at the left part of the inner tube. The catheter clamping assembly includes a bolt sleeve, a handle bolt, and a supporting base. The bolt sleeve is fixedly installed on the outer wall of the inner tube. The axis of the bolt sleeve is perpendicular to the axis of the inner tube. The rod part of the handle bolt is screwed into the bolt sleeve and passes through a through hole provided on the inner tube wall. The supporting base is fixedly installed inside the inner tube and faces the end face of the rod part of the handle bolt;

[0009] After the catheter is placed inside the inner tube from the notch, rotate the handle bolt downward. By using the clamping force between the rod part of the handle bolt and the supporting base, the catheter can be clamped and fixed;

[0010] A catheter shearing assembly is provided at the right part of the outer tube. The catheter shearing assembly includes a blade and a shearing base facing the blade. The moving directions of both the blade and the shearing base are perpendicular to the axis of the outer tube. The cutting edge of the blade and the shearing contact surface on the upper surface of the shearing base are located inside the outer tube.

[0011] After the catheter is clamped and fixed, slide the inner tube to the left so that the tip part of the catheter is located between the blade and the shearing base of the catheter shearing assembly. At the same time, apply pressure to the blade and the shearing base to make them move towards each other, and use the shearing force to cut off the tip of the catheter. The shearing base is provided below the catheter to facilitate exerting force during shearing.

[0012] Preferably, the specific structure of the catheter shearing assembly is as follows:

[0013] The first sleeve and the second sleeve are coaxially arranged and are respectively fixedly installed on the opposite upper and lower outer walls of the outer tube. The axes of the first sleeve and the second sleeve are perpendicular to the axis of the outer tube; Two through holes that are respectively aligned with the lumens of the first sleeve and the second sleeve and have suitable sizes are provided on the outer tube wall;

[0014] A first limiting ring and a second limiting ring are respectively fixedly installed on the inner walls of the first sleeve and the second sleeve;

[0015] The blade is fixedly installed at the bottom end of the first movable column. The top end of the first movable column is fixedly installed with a first pressing plate. The first movable column is slidably arranged inside the first sleeve and is sleeved in the hole of the first limiting ring. A first return spring is sleeved outside the first movable column. The first return spring is compressed between the first pressing plate and the first limiting ring;

[0016] The shearing base is fixedly installed at the top end of the second movable column. A second pressing plate is fixedly installed at the bottom end of the second movable column. The second movable column is slidably arranged in the second sleeve and sleeved in the hole of the second limiting ring. A second return spring is sleeved outside the second movable column, and the second return spring is compressed between the second pressing plate and the second limiting ring.

[0017] Preferably, the end face of the rod part of the handle bolt and the surface of the supporting base are both subjected to matte treatment or engraved with decorative patterns.

[0018] This can increase the friction force between the rod part of the handle bolt, the supporting base and the catheter, making the clamping of the catheter firmer.

[0019] As a preference, both the inner tube and the outer tube are rectangular tubes.

[0020] As another preference, both the inner tube and the outer tube are circular tubes.

[0021] As a further improvement of another preferred solution, the connection part between the supporting base and the inner tube is an arc adapted to the shape and size of the inner tube.

[0022] As another improvement of another preferred solution, a rib parallel to the axial direction of the inner tube is fixedly installed on the outer wall of the inner tube, and an axial sliding groove is also formed on the inner wall of the outer tube to slidably engage with the rib.

[0023] In this way, during use, the inner tube and the outer tube can only slide in the left-right direction and will not rotate relative to each other, ensuring that the notches of the inner tube and the outer tube are always aligned.

[0024] The beneficial effects of the present invention are as follows:

[0025] The operation process of the device of the present invention is simple and convenient, facilitating an operator to pull out the deep vein catheter in the patient's body and cut it as needed with one hand, and press the hemostasis at the deep vein catheter insertion site with the other hand;

[0026] The present invention can reduce the possibilities of hematoma at the puncture site of the patient, injury to the operator and contamination of the catheter tip caused by problems such as personnel cooperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the front view of Embodiment 1 of the present invention;

[0028] Figure 2 It is the sectional view of the state of pulling out the catheter in Embodiment 1 of the present invention;

[0029] Figure 3 It is the sectional view of the state of shearing the catheter in Embodiment 1 of the present invention;

[0030] Figure 4 is Figure 3 the sectional view along A-A;

[0031] Figure 5 is Figure 3 Cross-sectional view along B-B;

[0032] Figure 6 is the cross-sectional view of the state of the catheter shearing of Embodiment 2 of the present invention;

[0033] Figure 7 is Figure 6 Cross-sectional view along C-C;

[0034] Figure 8 is Figure 6 Cross-sectional view along D-D. Detailed implementation manners

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1

[0037] Figures 1 to 5 The first specific implementation manner of the deep vein catheter tip sampler of the present invention is shown, including an inner tube 1, an outer tube 2, a catheter clamping assembly, and a catheter shearing assembly, wherein:

[0038] Both the inner tube 1 and the outer tube 2 are rectangular tubes. The inner tube 1 is slidably sleeved inside the outer tube 2. Axial notches are provided on one side walls of the inner tube 1 and the outer tube 2 and the notches are aligned. The length of the inner tube 1 is greater than the length of the outer tube 2;

[0039] A catheter clamping assembly is provided at the left part of the inner tube 1. The catheter clamping assembly includes a bolt sleeve 3, a handle bolt 4, and a supporting base 5. The bolt sleeve 3 is fixedly installed on the outer wall of the inner tube 1. The axis of the bolt sleeve 3 is perpendicular to the axis of the inner tube 1. Internal threads adapted to the handle bolt 4 are provided on the inner wall of the bolt sleeve 3. The rod part of the handle bolt 4 is screwed into the bolt sleeve 3 and passes through a through hole provided on the wall of the inner tube 1. The supporting base 5 is fixedly installed inside the inner tube 1 and faces the end face of the rod part of the handle bolt 4. The end face of the rod part of the handle bolt 4 and the surface of the supporting base 5 are both frosted or engraved with pattern grids;

[0040] A catheter shearing assembly is provided at the right part of the outer tube 2. The catheter shearing assembly includes a blade 8 and a shearing base 14 facing the blade 8. The moving directions of the blade 8 and the shearing base 14 are both perpendicular to the axis of the outer tube 2. The cutting edge of the blade 8 and the shearing contact surface on the upper surface of the shearing base 14 are located inside the outer tube 2.

[0041] The specific structure of the catheter shearing assembly in this embodiment is:

[0042] The first sleeve 6 and the second sleeve 12 are coaxially arranged and are respectively fixedly installed on the opposite upper and lower outer walls of the outer tube 2. The axes of the first sleeve 6 and the second sleeve 12 are perpendicular to the axis of the outer tube 2. Two through holes that are respectively aligned with the lumens of the first sleeve 6 and the second sleeve 12 and have matching sizes are provided on the wall of the outer tube 2.

[0043] A first limiting ring 10 and a second limiting ring 16 are respectively fixedly installed on the inner walls of the first sleeve 6 and the second sleeve 12.

[0044] The blade 8 is fixedly installed at the bottom end of the first movable column 7. The top end of the first movable column 7 is fixedly installed with a first pressing plate 9. The first movable column 7 is slidably arranged in the first sleeve 6 and is sleeved in the hole of the first limiting ring 10. A first return spring 11 is sleeved outside the first movable column 7. The first return spring 11 is compressed between the first pressing plate 9 and the first limiting ring 10, and both ends of the first return spring 11 are fixedly connected to the first pressing plate 9 and the first limiting ring 10 respectively.

[0045] The shearing base 14 is fixedly installed at the top end of the second movable column 13. The bottom end of the second movable column 13 is fixedly installed with a second pressing plate 15. The second movable column 13 is slidably arranged in the second sleeve 12 and is sleeved in the hole of the second limiting ring 16. A second return spring 17 is sleeved outside the second movable column 13. The second return spring 17 is compressed between the second pressing plate 15 and the second limiting ring 16, and both ends of the second return spring 17 are fixedly connected to the second pressing plate 15 and the second limiting ring 16 respectively.

[0046] In the initial state, the blade 8 is located in the first sleeve 6 under the action of the first return spring 11 and does not extend beyond the through hole on the wall of the outer tube 2. The shearing base 14 is located in the second sleeve 12 under the action of the second return spring 17 and does not extend beyond the through hole on the wall of the outer tube 2.

[0047] The working principle and process of this embodiment are as follows:

[0048] Before use, both ends of the inner tube 1 extend out of the outer tube 2.

[0049] When in use, the tail end of the disinfected central venous catheter 19 is placed into the inner tube 1 through the notch between the inner tube 1 and the outer tube 2. Rotate the handle bolt 4 downward, and use the clamping force between the rod portion of the handle bolt 4 and the supporting base 5 to clamp and fix the central venous catheter 19.

[0050] Then the operator slides the inner tube 1 to the left with one hand, pulls out the central venous catheter 19 from the patient's body. The right end of the inner tube 1 retracts into the outer tube 2 and the right end face of the inner tube 1 is located on the left side of the catheter shearing assembly, and the tip portion of the central venous catheter 19 is located between the blade 8 and the shearing base 14 of the catheter shearing assembly. The operator can press the hemostasis at the insertion site of the central venous catheter 19 with the other hand.

[0051] Since the skin of the patient contacted by the right end of the inner tube 1 has been disinfected at the start of the operation, after partially withdrawing the deep venous catheter 19, the right end of the outer tube 2 will contact the disinfected skin of the patient, and the inner wall of the lumen of the outer tube 2 will contact the subcutaneous part of the deep venous catheter 19. Therefore, the contact between the outer wall of the right end of the inner tube 1 and the inner wall of the outer tube 2 is regarded as aseptic.

[0052] After that, the operator can press the first pressing plate 9 and the second pressing plate 15 towards each other as needed, so that the blade 8 and the shearing base 14 move towards each other, and use the shearing force to cut off the tip of the deep venous catheter 19 to complete the sampling of the tip of the deep venous catheter. At this time, the first return spring 11 and the second return spring 17 are compressed.

[0053] After the shearing is completed, the operator releases the hand, and the blade 8 and the shearing base 14 are reset under the action of the first return spring 11 and the second return spring 17 respectively.

[0054] Embodiment 2

[0055] Figures 6 to 8 The second specific implementation manner of the deep venous catheter tip sampler of the present invention is shown. This implementation manner is basically the same as that of Embodiment 1, except that: both the inner tube 1 and the outer tube 2 are circular tubes, the connection between the supporting base 5 and the inner tube 1 is an arc adapted to the shape and size of the inner tube 1, a rib 18 parallel to the axial direction of the inner tube 1 is fixedly installed on the outer wall of the inner tube 1, and an axial sliding groove is also opened on the inner wall of the outer tube 2 to slidably engage with the rib 18.

[0056] The working principle and process of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Claims

1. A deep vein catheter tip sampler, characterized in that: It comprises an inner tube (1), an outer tube (2), a catheter clamping assembly, and a catheter shearing assembly, wherein: The inner tube (1) is slidably sleeved inside the outer tube (2); the walls of the inner tube (1) and the outer tube (2) are both provided with axial notches, and the notches are aligned; the length of the inner tube (1) is greater than that of the outer tube (2); A catheter clamping assembly is arranged on the left side of the inner tube (1), and the catheter clamping assembly comprises a bolt sleeve (3), a handle bolt (4) and a supporting base (5); the bolt sleeve (3) is fixedly mounted on the outer wall of the inner tube (1); the axial direction of the bolt sleeve (3) is perpendicular to the axial direction of the inner tube (1); the rod of the handle bolt (4) is screwed into the bolt sleeve (3) and passes through a through hole provided on the wall of the inner tube (1); the supporting base (5) is fixedly mounted in the inner tube (1) and is directly opposite to the end face of the rod of the handle bolt (4); A catheter shearing assembly is arranged at the right part of the outer tube (2), and the catheter shearing assembly comprises a blade (8) and a shearing base (14) facing the blade (8), the movement directions of the blade (8) and the shearing base (14) are perpendicular to the axial direction of the outer tube (2), and the shearing contact surface between the blade of the blade (8) and the upper surface of the shearing base (14) is located inside the outer tube (2).

2. A deep vein catheter tip sampler according to claim 1, characterized in that: The specific structure of the catheter shearing assembly is: The first sleeve (6) and the second sleeve (12) are coaxially arranged and respectively fixedly mounted on the upper and lower outer walls of the outer tube (2), and the axial directions of the first sleeve (6) and the second sleeve (12) are perpendicular to the axial direction of the outer tube (2); the outer tube (2) wall is provided with two through holes which are respectively aligned with the lumens of the first sleeve (6) and the second sleeve (12) and have matching sizes; A first limiting ring (10) and a second limiting ring (16) are fixedly mounted on the inner walls of the first sleeve (6) and the second sleeve (12), respectively; The blade (8) is fixedly mounted on the bottom end of the first movable column (7), a first pressing plate (9) is fixedly mounted on the top end of the first movable column (7), the first movable column (7) is slidably arranged in the first sleeve (6) and sleeved in the hole of the first limiting ring (10), a first return spring (11) is arranged on the outer sleeve of the first movable column (7), and the first return spring (11) is compressed between the first pressing plate (9) and the first limiting ring (10); The shear base (14) is fixedly mounted on the top end of the second movable column (13); a second pressing plate (15) is fixedly mounted on the bottom end of the second movable column (13); the second movable column (13) is slidably disposed in the second sleeve (12) and sleeved in the hole of the second limiting ring (16); a second return spring (17) is disposed on the outer sleeve of the second movable column (13); the second return spring (17) is compressed between the second pressing plate (15) and the second limiting ring (16).

3. A deep vein catheter tip sampler according to claim 1, characterized in that: The end surface of the rod of the handle bolt (4) and the surface of the supporting base (5) are both frosted or engraved with patterned grids.

4. A deep vein catheter tip sampler according to claim 1, characterized in that: The inner tube (1) and the outer tube (2) are both rectangular tubes.

5. A deep vein catheter tip sampler according to claim 1, characterized in that: The inner tube (1) and the outer tube (2) are both circular tubes.

6. A deep vein catheter tip sampler according to claim 5, characterized in that: The connection between the supporting base (5) and the inner tube (1) is an arc shape that matches the shape and size of the inner tube (1).

7. A deep vein catheter tip sampler according to claim 5, characterized in that: A convex strip (18) parallel to the axial direction of the inner tube (1) is fixedly mounted on the outer wall of the inner tube (1), and an axial sliding groove is provided on the inner wall of the outer tube (2) to slide with the convex strip (18).

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