KR20050004983A - Intravenous catheter inserting device - Google Patents

Abstract

The venous catheter insertion device includes a catheter hub 5 having a duct 513 that engages the open front ends 223, 931 of the barrels 2, 9 and communicates with the passage 21 of the barrels 2, 9. do. The tubular catheter 6 is arranged in communication with the duct 513, thereby allowing the needle cannula 32 to pass through. The plunger 4 is received in the passage 21 and extends to the rear of the barrel 2 for manual operation. The plunger 4 has a cavity 41 containing fluid at a reduced pressure, so that the needle cannula 32 is inside the cavity 41 due to the pressure difference between the atmosphere and the reduced pressure. It is connected with the needle cannula 32 in the passage 21 to be drawn into.

Description

Intravenous catheter inserting device

The present invention relates to an intravenous catheter insertion device, and more particularly, to a venous catheter insertion device into which a needle cannula is drawn into a plunger cavity in a reduced pressure state.

Intravenous catheter insertion devices are commonly used to inject drugs into a patient's vein or draw blood from a patient's vein.

1 is a perspective view of a vein catheter insertion device according to the prior art, Figure 2 is a partial cross-sectional schematic for explaining a state that the needle cannula is fitted to the catheter of the vein catheter insertion device according to the prior art.

1 and 2, the conventional venous catheter insertion device 1 has a tubular needle seat 11 having a hub end 111 as shown, a needle cannula fixed to the hub end 111. 12), a catheter hub 13 fitted to the needle seat 11, and a flexible catheter hub 14 is fixed (fixed) to the catheter hub (13). In use, the catheter 14 and the needle cannula 12 are inserted into a patient's vein by a nurse sticking a sharp tip of the needle cannula 12 protruding out of the catheter 14 into the patient's vein. Is inserted. Then, a nurse pulls the needle cannula 12 from the catheter 14 on the one hand, simultaneously pressurizes the skin of the patient and removes the catheter 14 from the vein of the patient. Remove it. Thereafter, an injection member (not shown) containing a chemical liquid or an empty barrel is connected with the catheter hub 13 to inject or collect the chemical liquid into the patient's vein. At this time, the nurse should place the used needle cannula 12 and the needle seat 11 in a close tray (not shown), so that the sharp tip of the used needle cannula 12 is exposed to the needle by chance. There is a risk of being stabbed. In addition, blood contamination may occur while the catheter hub 13 is connected to the injection member or empty barrel.

Referring to FIG. 2, the flow of blood to the catheter 14 through the notch 121 of the needle cannula 12 is observed by the translucent catheter 14. However, since the notch 121 is present, the needle cannula 12 tends to bend when transferring the catheter 14 into the vein of the patient. In addition, the portion of the needle cannula 12 with the notch 121 becomes invisible when the blood in the catheter 14 is inserted into the vein of the patient.

It is an object of the present invention to provide an intravenous catheter insertion device for preventing accidental inadvertent contact with a needle cannula after use and for preventing contamination of the needle cannula drawn in with use.

1 is a perspective view of a vein catheter insertion device according to the prior art.

Figure 2 is a partial cross-sectional schematic for explaining a state that the needle cannula is fitted to the catheter of the vein catheter insertion device according to the prior art.

3 is an exploded cross-sectional view of a vein catheter insertion device according to a first preferred embodiment of the present invention.

4 is a cross-sectional view of a vein catheter insertion device in use according to a first preferred embodiment of the present invention.

5 is a cross-sectional view showing a state in which the sealing member is in contact with the coronary needle sheet in the vein catheter insertion apparatus according to the first preferred embodiment of the present invention.

6 is a cross-sectional view showing a state in which the sealing member is engaged with the tubular needle sheet in the vein catheter insertion apparatus according to the first preferred embodiment of the present invention.

7 is a cross-sectional view showing a state in which the sealing member is separated from the plunger body in the vein catheter insertion apparatus according to the first preferred embodiment of the present invention.

Figure 8 is a cross-sectional view showing a state in which the coronary needle sheet and the needle cannula is drawn into the plunger body in the venous catheter insertion device according to a first embodiment of the present invention.

9 is a fragmentary cross-sectional view for illustrating another use state of the venous catheter insertion device according to the first preferred embodiment of the present invention.

10 is a fragmentary cross-sectional view for showing a vein catheter insertion device according to a second preferred embodiment of the present invention.

11 is a cross-sectional view for showing a vein catheter insertion device according to a third preferred embodiment of the present invention.

12 is a perspective view for showing a vein catheter insertion device according to a fourth embodiment of the present invention.

13 is a cross-sectional view for showing a vein catheter insertion device according to a fourth preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: vein catheter insertion device 2: barrel

3: needle assembly 4: plunger

5: catheter hub 6: coronal catheter

7: No blood collection 9: Barrel

11: coronary needle sheet 12: needle cannula

13: catheter hub 14: flexible tubular catheter

21: Path 31: Ornamental needle sheet

32: needle cannula 33: tip protector

34 ： Sleeve tube 41 ： Joint

42: plunger body 43: sealing member

51: Central tubular wall 52: Plug

53: Ornamental insert 54: Defense member

55: Tube insert 61: Proximity part

62: remote part 71: accommodation space

72: wall 73: Information port

74: air outlet 81: first flexible connection tube

82: 2nd flexible connection tube 91: Small diameter part

92: large diameter part 111: hub end

121: Notch 211: Small diameter part

212: Large diameter part 213: Shoulder part

221: Outer barrel wall surface 222: Inner barrel wall surface

223: Open front end 224: Open rear end

225: First female thread part 226: Second female thread part

311: Engagement wall 312: Anchor part

313 ： hub end 314 ： second male thread part

315: Third male thread part 316: Convex surface

321: tip end 322: fixed end

323 ： Center part 331 ： Big open end

341: Open end 421: Upper end wall

422: Lower wall 423: External plunger wall surface

424 ： Inner periphery edge part 425 ： Female thread part

425: First male thread part 426: Catcher part

431: recess 432: anchor part

433: Third female thread part 434: Sealing part

511 ： Sleeve wall 512 ： Tip wall

513: duct 514: communication port

515: Reentry port 516: Through hole

517: Insertion hole 518: Maintenance shoulder

519 ： Boundary department 531 ： Pipeway

532 ： Rear flare end 534 ： Front neck end

535 ： Fluid passage 536 ： Inner side

551: fluid passage 552: rear flare end

554: Front neck end 555: Reentry pot

611: flange 931: open front end

932: Open rear end 934: Outer barrel wall surface

935 ： Male thread part 936 ： Inner barrel wall surface

2211: Front part 3121: Axial through hole

3122: Anchor end 4241: Projection

According to the invention, the venous catheter insertion device comprises a catheter hub, a tubular catheter, a barrel, a needle cannula, a tubular needle sheet and a plunger.

The catheter hub includes a tip wall surrounding a first axis and defining a through hole, a sleeve wall having an inner sleeve wall defining an insertion hole larger than the through hole, and inserted into the tip wall and the sleeve wall and with the through hole. And a central tubular wall defining a duct for communicating the insertion hole and having a communication port for communicating the duct with the atmosphere.

The tubular catheter includes a proximal portion disposed in the through hole and extending along the first axis to communicate with the duct, and a remote portion extending from the proximal portion along the first axis to protrude outwardly of the tip wall. do.

The barrels have outer and inner barrel wall surfaces corresponding to each other and surrounding the second axis. The inner barrel wall surface defines a passage having a corresponding open front and rear end, respectively, a large diameter portion and a small diameter portion disposed adjacent to the open rear and front ends, respectively, to define the rear and front passageways and form a shoulder portion. Include. The outer barrel wall surface has a front portion fixed relative to the inner sleeve wall surface such that the first axis and the second axis coincide.

The needle cannula includes a corresponding tip end and a fixed end and a central portion inserted therebetween.

The tubular needle sheet is received in the passageway and extends along the second axis. The tubular needle sheet includes a hub end disposed to be secured to the fixed end, an engagement wall extending from the hub end along the second axis and defining an axial passageway to be supplied or communicated to the fixed end, and the passageway; An anchor portion defining an axial through hole to communicate with and extending outwardly of the front passageway from the engagement wall. The engagement wall has an outer wall surface that is rotatable about the small diameter portion about the second axis between the engaged position and the disengaged position and the disengaged position, wherein the engagement wall is along the second axis. It does not move or moves with respect to the said small diameter part, respectively. The anchor portion ends at an anchor end that rotates with the engagement wall. When the engagement wall is rotated clockwise from the engaged position to the disengaged position, the anchor end moves from a hook up position close to the shoulder portion to a pressurized position away from the shoulder portion.

The plunger is received in the passage so that in the use position the plunger moves along the large diameter portion and in the processing position the plunger does not move along the large diameter portion and rotates about the large diameter portion. The plunger includes a plunger body and a sealing member.

The plunger body includes a top wall disposed to face the shoulder portion and a bottom wall extending outward of the open rear end to move and rotate the plunger. The top wall has an inner peripheral edge surrounding the second axis and defining a cavity therein. The cavity extends along the second axis in the direction of the bottom wall and includes fluid at reduced pressure.

The sealing member includes an anchor portion and a sealing portion. The anchor portion is arranged to engage the anchor end such that the plunger body rotates in the clockwise direction with respect to the large diameter portion when the plunger is in the treatment position and when the engagement wall is in the engaged position. It rotates from the engaged position to the disengaged position, whereby the anchor end moves from the connected position to the pressed position. The seal is attached to seal the inner peripheral edge portion along a seal line to attract the fluid in the cavity.

The sealing line moves the anchor end from the connecting position to the pressed position to break the sealing line so that the anchor portion is pushed down, wherein the sealing member is freed from the plunger body. Thus, the tubular needle sheet is pulled by the sealing member sucked into the cavity due to the pressure difference between the needle cannula and the reduced pressure and the atmosphere guided through the communication port, where the needle A cannula is drawn into the cavity from the coronary catheter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used for the same members.

3 is an exploded cross-sectional view of the vein catheter insertion device according to a first preferred embodiment of the present invention, Figure 4 is a cross-sectional view in the state of use of the venous catheter insertion device according to a first embodiment of the present invention.

3 and 4, the venous catheter insertion device according to the first preferred embodiment of the present invention is the catheter hub 5, the tubular catheter 6, the barrel 2, the needle assembly 3 as shown And a plunger 4.

The catheter hub 5 is inserted between the tip wall 512, the sleeve wall 511 corresponding to the tip wall 512 along the first axis, and between the tip wall 512 and the sleeve wall 511. A central tubular wall 51.

The tip wall 512 surrounds the first axis and defines a through hole 516 extending along the first axis. The sleeve wall 511 has an inner sleeve wall surface surrounding the first axis and defining an insertion hole 517 larger than the through hole 516. The central tubular wall 51 has an inner tubular wall defining a duct communicating the insertion hole 517 and the through hole 516 and an outer tubular wall corresponding to the inner tubular wall in the radial direction. The central tubular wall 51 also has a communication port 514 extending radially through the inner and outer tubular walls such that the atmosphere is in communication with the duct 513. As shown in FIG. 4, a plug 52 is disposed adjacent to the communication port 514. The inner tubular wall of the central tubular wall 51 forms a retaining shoulder 518 like the tip wall 512. The retaining shoulder 518 faces the duct 513 along the first axis.

The tubular catheter 6 is disposed in the through hole 516 and protrudes outwardly of the proximal portion 61 and the tip wall 512 extending along the first axis to communicate with the duct 513. And a remote portion 62 extending from the proximity portion 61 along a first axis. The proximal portion 61 terminates at a flange portion 611 held adjacent to the holding shoulder 518.

The barrel 2 has outer and inner barrel wall surfaces 221, 222 that correspond to each other and surround the second axis. The inner barrel wall surface 222 defines a passage 21 having open front and rear ends 223, 224 arranged to correspond to each other in the longitudinal direction parallel to the second axis, respectively defining the rear and front passages. A large diameter portion 212 and a small diameter disposed adjacent to the open rear and front ends 224 and 223, respectively, to define a shoulder portion 213 between the large diameter portion 212 and the small diameter portion 211. And a neck 211. The outer barrel wall surface 221 is adjacent the open front end 223 and has a front portion 223 that can be inserted into the insertion hole 517 so as to be adjacent to the inner sleeve wall surface of the sleeve wall 511. And the first axis and the second axis thereby coincide. The first female threaded portion 225 includes a plurality of ribs arranged to have a predetermined interval and is disposed at the large diameter portion 212 adjacent to the open rear end 224. The second female screw portion 226 in the form of a spiral groove is disposed in the small diameter portion 211 adjacent to the shoulder portion 213.

The needle assembly 3 comprises a needle cannula 32 and a tubular needle sheet 31.

The needle cannula 32 includes a tip end 321 and a fixed end 322 corresponding to each other, and a central portion 323 inserted between the tip end 321 and the fixed end 322. The tubular needle sheet 31 extends from the hub end 313 along the second axis and the hub end 313 arranged to secure the fixed end 322 of the needle cannula 32, and An engagement wall 311 that defines an axial passageway for supply or communication to the fixed end 322 of the needle cannula 32. The engagement wall 311 includes a plurality of ribs arranged to have a predetermined angle and surrounds the second axis so as to mate with the second female threaded portion 226 in the (center) engagement position (second). With an external engagement wall surface provided with a male thread portion, the engagement wall 311 of the tubular needle sheet 31 does not move relative to the small diameter portion 211 along the second axis in this position.

The tubular needle sheet 31 defines an axial through hole 3121 for communicating with the passage 21 and terminates in the small diameter portion 211 from the engagement wall 311 so as to terminate at the anchor end 3122. It further includes an anchor portion 312 extending to the outside of the front passage. (Third) The male screw portion 315 includes a plurality of ribs and is disposed at the anchor end 3122.

Fig. 5 is a cross-sectional view showing a state in which the sealing member is in contact with the tubular needle sheet in the vein catheter insertion apparatus according to the first preferred embodiment of the present invention.

The plunger 4 is received in the passage 21, in the use position as in FIG. 4, the plunger 4 moves along the large diameter portion 212 in the longitudinal direction, and in the treatment position as in FIG. Does not move along the large diameter portion 212 but rotates with respect to the large diameter portions 212 and 92. The plunger 4 comprises a plunger body 42 and a sealing member 43.

The plunger body 42 includes an upper wall 421 disposed to meet the shoulder part 213, and a lower wall 422 corresponding to the upper wall 421 in the longitudinal direction. The bottom wall 422 extends out of the open rear end 224 so that the plunger 4 moves and rotates. The top wall 421 has an inner peripheral edge 424 that surrounds the second axis and defines a cavity 41 therein. The cavity 41 extends in the direction of the bottom wall 422 along the second axis and includes fluid at reduced pressure. The plunger body 42 also has an outer plunger wall surface 423 that surrounds the second axis. The first male thread portion 425 includes a plurality of ribs and is disposed on the outer plunger wall surface 423. A catcher portion 426 is disposed at the inner peripheral edge portion 424 adjacent to the bottom wall 422.

The sealing member 43 is formed of an elastomeric material and includes an anchor portion 432 and a sealing portion 434. The anchor portion 432 defines a recess 431 formed to receive the anchor end 3122 of the anchor portion 312 and to engage the anchor end 3122 of the anchor portion 312. It has an inner wall extending along the second axis. The inner wall is formed with a third female thread portion 433 in the form of a spiral groove. Referring to FIG. 4, the projection 4241 extends radially forward of the second axis from the inner peripheral edge portion 424 so as to frictionally contact the seal 434, thereby extending into the cavity 41. The sealing line is formed to block the fluid.

In use, as shown in FIG. 4, a nurse grabs the barrel 2 with one hand and the tip end 321 of the needle cannula 32 and the remote portion 62 of the tubular catheter 6. ) Is inserted into the patient's vein. The anchor portion 312 of the tubular needle sheet 31 has good permeability, and has a convex surface 316 to enlarge and show the flow of blood through the axial through hole 3121. As soon as the nurse notices that the blood does not flow into the anchor portion 312, the nurse pulls the plunger 4 back slightly to draw the blood until the blood is seen through the anchor portion 312. Confirm that the coronary catheter 6 is correctly inserted into the vein of the patient.

6 is a cross-sectional view showing a state in which the sealing member is engaged with the tubular needle sheet in the vein catheter insertion apparatus according to the first preferred embodiment of the present invention.

5 and 6, the plug 52 shown in FIG. 4 is removed from the communication port 514 such that the duct 513 and the atmosphere are in communication. The plunger 4 is pressed forward to contact the tubular needle sheet 31 (see FIG. 5). The movement of the plunger 4 along the large diameter portion 212 is suppressed by the first male thread portion and the first female thread portions 425 and 225. The plunger 4 is turned towards the open front end 223. By the screw movement of the plunger 4, the sealing member 43 rotates with respect to the tubular needle sheet 31, and as shown in FIG. 6, the third male thread portion and the third female thread portion 315. 433, the anchor portion 432 of the sealing member 43 is engaged with the anchor portion 3122. Thus, the tubular needle sheet 31 is rotatable like the sealing member 43.

Figure 7 is a cross-sectional view showing a state in which the sealing member is separated from the plunger body in the vein catheter insertion device according to a first preferred embodiment of the present invention, Figure 8 is a tubular in the vein catheter insertion device according to a first preferred embodiment of the present invention It is sectional drawing which shows the state which the needle sheet and the needle cannula drag in into the plunger body.

Referring to FIG. 7, afterwards, the tubular needle sheet 31 is turned around the second axis to rotate the second male threaded portion 314 from the second female threaded portion 226 to a position where the engagement is released for removal. When the plunger 4 further rotates clockwise with respect to the large diameter portion 212 such that the engagement wall 311 of the tubular needle sheet 31 is rotated relative to the small diameter portion 311. Move along the second axis in the direction of the open rear end 224. The anchor end 3122 is also rotated to move from a connection position close to the shoulder portion 213 to a pressurized position away from the shoulder portion 213. At the same time, the anchor end 3122 is moved from the connecting position to the pressed position to break the sealing line so that the anchor portion 432 is pressed down, wherein the sealing member 43 is the plunger body 42. Free from) With reference to FIG. 8, the tubular needle seat 31 is formed by the cavity (3) due to the pressure difference between the needle cannula 32 and the reduced pressure and the atmosphere guided through the communication port 514. 41) is pulled by the sealing member 43 which is sucked into it, where the needle cannula 32 is drawn from the tubular catheter 6 into the cavity 41. By the catcher portion 426, the needle cannula 32 as well as the tubular needle sheet 31 do not collide with the bottom wall 422.

9 is a fragmentary cross-sectional view for illustrating another use state of the venous catheter insertion device according to the first embodiment of the present invention.

Thus, in use, the nurse can plug the communication port 514 with the plug 52 and allow the small passage of blood into the passage 21 of the barrel 2 through the tubular catheter 6. To attract, the plunger body 42 can be pulled toward the open rear end 224 with the sealing member 43 and the needle assembly 3 left. Referring to FIG. 9, when the nurse needs to suck up a large amount of blood, the blood collection member 7 is connected to the catheter hub 5. The blood collection member 7 includes a wall 72 defining a receiving space 71 and having a guide port 73 in communication with the receiving space 71. The first flexible connection tube 81 is arranged to be connected to the guide port 73 and the communication port 514 at once. The blood flows through the coronary catheter 6, the duct 513 and the first flexible connection tube 81 to the blood collection member 7 without having to pull the plunger body 42 and the nurse passes the blood. Avoid contact with

10 is a fragmentary cross-sectional view for showing a vein catheter insertion device according to a second preferred embodiment of the present invention.

Instead, referring to FIG. 10, the vein catheter insertion apparatus according to the second preferred embodiment of the present invention is similar in structure to the first embodiment described above. In addition to the components according to the first embodiment described above, the inner sleeve wall surface of the sleeve wall 511 of the catheter hub 5 is through the sleeve wall 511 to communicate with the insertion hole 517. It has a reentry port 515 extending radially and corresponding to the communication port 514 to the boundary 519. In addition, the vein catheter insertion device according to the second embodiment further comprises a protective member 54 and a coronary insert 53. The protective member 54 is formed of an elastomeric material such as rubber. The tubular insert 53 is a front neck end 534 connected to the defense member 54 and defining a passageway 531 along the first axis, and the front neck end 534 along the first axis. ) And a rear flare end 532 having an inner proximal surface 536. The inner proximal surface 536 defines a fluid passage 535 that surrounds the first axis and extends to allow the reentry port 515 to communicate. Moreover, the blood collection member 7 has an air outlet 74 spaced apart from the guide port 73 at regular intervals. The second flexible connection tube 82 is arranged to be connected to the air outlet 74 and the reentry port 515 at once. In assembly, the protective member 54 to which the front neck end 534 is connected engages with the inner sleeve wall of the sleeve wall 511 of the catheter hub 5 at the boundary 519. The front portion 2211 of the barrel 2 engages with the inner proximal surface 536 of the tubular insert 53, where the passageway 531 and the passageway 21 of the barrel 2. ) Is aligned. The needle cannula 32 (not shown in FIG. 10) extends through the passageway 531, the slit in the protective member 54, the duct 513 and the tubular catheter 6. After the used needle assembly 3 (not shown in FIG. 10) is drawn into the plunger body (not shown in FIG. 10) in the same manner as described above, the slit in the protective member 54 is It is closed by the properties of the elastomeric material itself.

According to the alignment of the protective member 54, the second flexible connecting tube 82, the reentry port 515 from the air outlet 74 immediately after noticing that blood does not flow into the blood collection member 7. And a nurse may pull the plunger body 42 backward to guide the flow of air through the fluid passageway 535 to the passageway 21 of the barrel 2, whereby blood is collected from the blood collection member. (7) flows easily.

11 is a cross-sectional view for showing a vein catheter insertion device according to a third preferred embodiment of the present invention.

Referring to FIG. 11, the vein catheter insertion device according to the third preferred embodiment of the present invention is similar in structure to the first embodiment. The duct 513 of the catheter hub 5 is in communication with the passage 21 of the barrel 2 via the tubular insert 55. The tubular insert 55 is connected to the defense member 54 and defines a front neck end 554 defining a passageway along the axis, and a rear flare end extending from the front neck end 554 along the axis. Has 552. The back flare end 552 extends radially in communication with the fluid passage 551 and an inner proximal surface surrounding the axis and defining a fluid passage 551 and having a reentry port 555. The front portion 2211 of the barrel 2 engages the adjoining surface of the tubular insert 55. In the same manner as in the second embodiment, after the used needle assembly 3 is drawn into the plunger body 42, the slit in the protective member 54 is closed by the properties of the elastomer itself. .

12 is a perspective view for showing a vein catheter insertion device according to a fourth embodiment of the present invention, Figure 13 is a cross-sectional view for showing a vein catheter insertion device according to a fourth embodiment of the present invention.

12 and 13, the vein catheter insertion device according to the fourth preferred embodiment of the present invention includes a shorter barrel 9 than the above-described embodiment. The barrel 9 has a small diameter portion and a large diameter portion 91, 92 and also has an inner barrel wall surface 936 that defines a passage having open front and rear ends 931, 932. The sleeve wall 511 of the catheter hub 5 is engaged with the open rear end 931. The large diameter portion 92 has a male thread portion 935 for engaging with the female thread portion 425 formed on the outer plunger wall surface of the plunger 4. In use, a nurse grabs the outer barrel wall 934 and pushes the needle cannula 32 as well as the coronary catheter 6 into the patient's vein to allow blood to flow into the barrel 9. Insert it. Thereafter, in the same manner as described above, the needle cannula 32 is drawn into the cavity 41 of the plunger 4 for safe processing.

Moreover, the tip protector 33 is arranged to protect the needle cannula 32 and the catheter hub 5 and has a large open end 331 for inserting the front half of the barrel 9. The sleeve tube 34 is arranged to protect the plunger 4 and has an open end 341 for inserting the rear half of the barrel 9. Thus, the needle cannula 32 and the plunger 4 are completely protected by the tip protector 33 and the sleeve tube 34 to prevent nurse contact.

As described above, the disposable syringe according to the preferred embodiments of the present invention has the following advantages.

1. After inserting the needle cannula 32 while rotating the plunger body 42 clockwise with respect to the large diameter portion 212, the used needle assembly 3 is formed of the plunger body 42. It can be drawn into the cavity 41 to facilitate processing of the venous catheter insertion device.

2. Since the anchor portion 312 of the tubular needle sheet 31 has good permeability and has the convex surface 316, the blood flow through the axial through hole 3121 appears enlarged to the nurse.

3. After the used needle assembly 3 has been drawn into the cavity 41, a nurse may draw blood into the passage 21 or the blood collection without having to remove the barrel 2 and the catheter hub 5. The plunger body 42 can be pulled directly to suck into the member 7.

While the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated.

Claims (10)

A tip wall 512 surrounding the first axis and defining a through hole 516 extending along the first axis; A sleeve wall 511 having an inner sleeve wall surface corresponding to the tip wall 512 along the first axis and defining an insertion hole 517 that surrounds the first axis and is larger than the through hole 516; The duct 513 is inserted between the tip wall 512 and the sleeve wall 511 and defines a duct 513 through the insertion hole 517 and the through hole 516, and the atmosphere is the duct 513. A catheter hub (5) comprising a central tubular wall (51) having a communication port (513) extending in communication therewith; The proximal portion 61 disposed along the first axis and protruding out of the tip wall 512 and the proximal portion 61 extending along the first axis to be in communication with the duct 513. A coronary catheter (6) comprising a remote portion (62) extending from (61); Having outer and inner barrel wall surfaces 221, 222 corresponding to each other surrounding the second axis, The inner barrel wall surface defines a passage 21 having open front and rear ends 223, 224, 931, 932 arranged to correspond to each other in the longitudinal direction parallel to the second axis, The inner barrel wall surface 222 defines rear and front passages, respectively, and the open rear and back portions respectively to form a shoulder portion 213 between the large diameter portions 212 and 92 and the small diameter portions 211 and 91. A large diameter portion 212, 92 and a small diameter portion 211, 91 disposed adjacent to the front ends 224, 223, 932, 931, The outer barrel wall surface 221 has a front portion 2211 adjacent the open front ends 223 and 931 and fixed to the inner sleeve wall surface, Barrels (2, 9) for causing the first axis and the second axis to coincide; A needle cannula (32) comprising a tip end and a fixed end (321, 322) corresponding to each other and a central portion (323) positioned between the tip end and the fixed end (321, 322); Is received in the passage 21 and extends along the second axis, A hub end 313 arranged to secure the fixed end 322, Extends from the hub end 313 along the second axis and defines an axial passageway for supply or communication to the fixed end 322, An outer engagement wall surface that surrounds the second axis and engages or rotates about the small diameter portions 211, 91 around the second axis between the engaged position and the disengaged position; The engaging portion 311 which is not moved or moves with respect to the small diameter portions 211 and 91 respectively along the second axis at that position and Defines an axial through hole 3121 for communication with the passageway 21 and extends from the engagement wall 311 outward of the front passageway, Pressing away from the shoulder portion 213 at a hook-up position close to the shoulder portion 213 when the engagement wall 311 is rotated clockwise from the engagement position to the position where the engagement is released. A tubular needle seat (31) comprising an anchor portion (312) ending at the anchor end (3122) which rotates with the engagement wall (311) to move to a closed position; And Is accommodated in the passage 21 and moves along the large diameter portions 212, 92 in the longitudinal direction at the use position, and does not move along the large diameter portions 212, 92 at the treatment position; 92), An upper wall 421 disposed to meet the shoulder portion 213 and a lower wall 422 corresponding to the upper wall 421 in the longitudinal direction, and the lower wall 422 includes the plunger 4. An inner peripheral edge 424 extending outward of the open rear ends 224, 932 so that the top wall 421 surrounds the second axis and defines a cavity 41 therein. Wherein the cavity 41 extends in the direction of the bottom wall 422 along the second axis, and includes a plunger body 42 containing fluid at a reduced pressure; Disposed to engage the anchor end 3122 in the clockwise direction relative to the large diameter portions 212, 92 when the plunger 4 is in the treatment position and when the engagement wall 311 is in the engaged position. Rotation of the plunger body 42 causes the engagement wall 311 to rotate from the engaged position to the disengaged position, thereby moving the anchor end 3122 from the connected position to the pressed position. Anchor portion 432 and Is hermetically attached to the inner peripheral edge 424 along a sealing line to draw the fluid in the cavity 41, The sealing line is formed such that the anchor end 3122 moves from the connecting position to the pressed position to break the sealing line, where the sealing member 43 is freed from the plunger body 42. , The tubular needle sheet 31 is suctioned into the cavity 41 due to the pressure difference between the needle cannula 32 and the reduced pressure and the atmosphere guided through the communication port 514. Pulled by the member 43, wherein the needle cannula 32 comprises a sealing member 43 including a seal 434 that is drawn from the tubular catheter 6 into the cavity 41. Intravenous catheter insertion device comprising a plunger (4). 2. The front portion 2211 of the outer barrel wall surface 221 of the barrel 2 is inserted into the insert so as to be adjacent to the inner sleeve wall surface of the sleeve wall 511 of the catheter hub 5. Inserted into hole 517; The plunger body (42) has an outer plunger wall (423) surrounding said second axis; To prevent the plunger body 42 from moving along the large diameter portions 212, 92 while the plunger body 42 rotates clockwise relative to the large diameter portions 212, 92 at the treatment position. And a first male threaded portion and a first female threaded portion (425, 225) on the outer plunger wall surface (423) and the large diameter portions (212, 92), respectively. 3. The second male threaded portion and the second female threaded portion according to claim 2, wherein the external engagement wall surfaces and the small diameter portions 211, 91 are respectively disposed on the external engagement wall surfaces so as to rotate with respect to the small diameter portions 211, 91. Intravenous catheter insertion device further comprises (314, 226). 4. The anchor portion (432) of claim 3, wherein the anchor portion (432) has an inner wall extending along the second axis to define a recess (431) formed to receive the anchor end (3122). The third male thread portion and the third female thread portion 315 disposed respectively at the anchor end 3122 and the inner wall to rotate relative to each other so that the anchor portion 432 is connected to the anchor end 3122. 433), further comprising a vein catheter insertion device. 5. The protrusion 4241 of claim 4, wherein the protrusion 4241 extends radially forward of the second axis from the inner peripheral edge portion 424 so as to frictionally contact the sealing portion 434 to form the sealing line. Intravenous catheter insertion device, characterized in that it further comprises. The inner sleeve wall surface of the sleeve wall 511 defines a boundary 519 surrounding the first axis and defines the sleeve wall 511 to communicate with the insertion hole 517. A reentry port 515 extending radially through and corresponding to the communication port 514 with respect to the boundary 519, A defense member 54 engaged with the inner sleeve wall at the boundary 519; And A front neck end 534 connected to the defense member 54 and defining a passageway 531 along the first axis and extending from the front neck end 534 along the first axis and having an inner proximal surface ( A back flare end 532 having 536, The inner proximal surface 536 defines a fluid passageway 535 that surrounds the first axis and extends so that the reentry port 515 communicates with the inner proximal surface 536 of the barrel 2. Meshes with the front portion 2211 of the outer barrel wall surface 221, whereby the needle cannula 32 extends through the passageway 531 to extend outward of the tubular catheter 6. Intravenous catheter insertion device, characterized in that it further comprises a tubular insert (53) is aligned with the passage (21) of the furnace (531) and the barrel (2). A passage 21 having an open front and rear ends 223, 224, 931 and 932 extending in the longitudinal direction and corresponding to each other in the longitudinal direction and a front portion 2211 adjacent to the open front ends 223 and 931. Barrels 2 and 9 having outer barrel wall surfaces 221 having A needle cannula 32 received to receive the open front ends 223 and 931, and A cavity received in the passage 21 to move in the longitudinal direction, extending outwardly of the open rear ends 224 and 932 to be manually operated, extending in the longitudinal direction and containing fluid at a reduced pressure ( 41), As soon as the needle cannula 32 is affected by the suction force that occurs as a result of the pressure difference between the atmosphere and the reduced pressure, the needle cannula 32 is drawn into the cavity 41 such that In a venous catheter device used as a disposable syringe comprising a plunger (4) connected to the needle cannula (32) in 21), A tip wall 512 surrounding the axis and defining a through hole 516 extending along the axis, An inner sleeve wall surface corresponding to the tip wall 512 along the axis and surrounding the axis and defining an insertion hole 517 larger than the through hole 516, The inner sleeve wall surface is adapted to be secured against the front portion 2211 of the outer barrel wall surface 221 of the barrel 2 to align the passage 21 with the through hole 516. 511) and The needle is inserted between the tip wall 512 and the sleeve wall 511 and when the inner sleeve wall surface is fixed relative to the front portion 2211 of the outer barrel wall surface 221 of the barrel 2. A catheter that defines a duct 513 suitable for passage through the cannula 32 and includes a central tubular wall 51 having a communication port 514 extending to communicate with the duct 513. Hub 2; And A proximal portion 61 disposed in the through hole 516 and extending along the axis to communicate with the duct 513, and an outer side of the tip wall 512 along the axis from the proximal portion 61. A remote portion adapted to extend outwardly and fit into the needle cannula 32 when the needle cannula 32 passes through the duct 513 so that the needle cannula 32 extends therefrom outward. A tubular catheter device comprising a tubular catheter (6) comprising (62). 8. The central tubular wall (51) according to claim 7, wherein the central tubular wall (51) has an inner tubular wall that defines the duct (513) and an outer tubular wall that corresponds to the inner tubular wall in the radial direction, the inner tubular wall being the A tip wall 512 is formed with a retaining shoulder 518, wherein the retaining shoulder 518 meets the duct 513 along the axis, and the proximal portion 61 is outward of the through hole 516. Intravenous catheter device, characterized in that it extends along the axis to protrude and terminates at a flange portion (611) adjacent and retained to the holding shoulder (518). 9. The inner sleeve wall surface of claim 8 defines an interface 519 surrounding the axis and extends radially through the sleeve wall 511 to communicate with the insertion hole 517. A reentry port 515 corresponding to the communication port 514, A protective member 54 formed of an elastomeric material and engaged with the inner sleeve wall at the boundary 519; And A front neck end 534 connected to the defense member 54 and defining a passageway 531 along the axis, and extending from the front neck end 534 along the axis and defining an inner proximal surface 536. The branch includes a rear flare end 532, The inner proximal surface 536 defines a fluid passageway 535 that surrounds the axis and extends in communication with the reentry port 515, wherein the inner proximal surface 536 defines the outer barrel of the barrel 2. Suitable for engagement with the front portion 2211 of the wall surface 221, The passageway 531 allows the passage 21 of the barrel 2 so that the needle cannula 32 passes through the passageway 531 and extends outwardly of the tubular catheter 6. Intravenous catheter device, characterized in that it further comprises a tubular insert (53) aligned with. 9. The inner sleeve wall surface of claim 8 wherein the inner sleeve wall defines a boundary surrounding the axis, A defense member 54 engaged with the inner sleeve wall at the boundary; And A front neck end 554 connected to the defense member 54 and defining a passageway along the axis and a rear flare end 552 extending from the front neck end 554 along the axis, The rear flare end 552 extends radially in communication with the fluid passage 551 and an inner proximal surface surrounding the axis and defining a fluid passage 551 and corresponding to the communication port 514 for the boundary. Including a reentry port 555, The inner proximal surface of the rear flare end 552 is adapted to engage the front portion 2211 of the outer barrel wall surface 221 of the barrel 2, Accordingly, the tubular insert is aligned with the passage 21 of the barrel 2 so that the needle cannula 32 passes through the passageway and extends outwardly of the tubular catheter 6. 55) further comprising a venous catheter device.