JP4078258B2 - Venous catheter insertion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to venous catheter insertion devices, and more particularly to an inner catheter insertion device that allows a cannula needle to be retracted in a negative pressure plunger cavity.
[0002]
[Prior art]
Intravenous catheter insertion devices are commonly used to administer drug solutions to blood or to extract blood from a patient's blood vessels. 1 and 2, a typical venous catheter insertion device 1 includes a tubular needle seat 11 having a hub end 111, a cannula needle 12 fixed to the hub end 111, a catheter hub 13 inserted on the needle seat 11, and It is shown to include a flexible catheter tube 14 that is secured to the catheter hub 13. In use, the catheter 14 and cannula needle 12 are inserted into the patient's blood vessel by the nurse by inserting into the patient's blood vessel with a sharp tip cannula needle 12 protruding outward from the catheter 14. The nurse then pulls the cannula needle 12 out of the catheter 14 by hand and simultaneously presses the patient's skin with the other hand, thereby leaving the catheter 14 in the patient's blood vessel. Subsequently, an infusion member (not shown) or an empty barrel having a drug solution to administer the drug solution or extract blood into the patient's blood vessel is connected. At this time, since the nurse places the used cannula needle 12 and the needle seat 11 on the side tray, the sharp tip of the used cannula needle 12 may cause an accident that the needle is stuck. Furthermore, blood contamination may occur while connecting the catheter hub 13 to an infusion member or an empty barrel.
[0003]
Referring to FIG. 2, during the insertion process, blood inflow into the catheter through the notch 121 in the cannula needle 12 is observed through the transparent catheter 14. However, the notch 121 makes it easier for the cannula needle 12 to bend in the process of passing the catheter 14 into the patient's blood vessel. Further, when a portion of the cannula needle 12 with the notch 121 is inserted into the patient's blood vessel, blood in the catheter 14 becomes invisible.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a venous catheter insertion device capable of preventing accidents and inadvertent contact with a cannula needle after use, and preventing contamination due to use.
[0005]
[Means for Solving the Problems]
In accordance with the present invention, a venous catheter insertion device includes a catheter hub, a catheter tube, a barrel, a tubular cannula needle, a tubular needle seat, and a plunger.
[0006]
The catheter hub surrounds the first axis and defines an enclosing tip wall defining a through hole, a sleeve wall having an inner sleeve wall defining an insertion hole larger than the through hole, and interposed between the enclosing tip wall and the sleeve wall And defining a duct that communicates with the insertion hole through the through hole, and including an intermediate tubular wall having a communication port that communicates with the surrounding air.
[0007]
The catheter tube is disposed within the through-hole and includes a proximal segment extending along the first axis and communicating with the duct, and a distal segment extending from the proximal segment along the first axis and projecting outside the surrounding tip wall.
[0008]
The barrel has outer and inner surrounding barrel walls that face each other and surround a second axis. The inner barrel wall defines a passage having openings facing the front end and the rear end, defines a rear passage and a front passage, respectively, and is located in the vicinity of the front and rear ends to surround the shoulder A large-diameter segment that forms a segment, and a small-diameter segment. The outer enclosure barrel wall has a front enclosure region that is fixed relative to the inner sleeve wall such that the first and second axes coincide. The cannula needle includes an opposite tip and a fixed end and an intermediate segment therebetween.
[0009]
The tubular needle seat is received in the passage and extends along the second axis. The tubular needle seat has a hub end arranged to fix the fixed end, a surrounding engagement wall extending from the hub end along the second axis, and defining an axial passage for receiving or communicating with the fixed shaft; Including an anchor segment that defines an axial through hole for communicating with the outer peripheral wall and extends from the surrounding engagement wall to the outside of the front passage. The encircling engagement wall has an outer engaging wall surface that engages with the small-diameter segment and rotates relative to the small-diameter segment about the second axis between the engaging position and the releasing position, Along the second axis, it becomes immovable or movable with respect to the small-diameter segment. The anchor segment terminates at an anchor end that rotates with the surrounding engagement wall. Thus, when the surrounding engagement wall rotates clockwise from the engagement position to the release position, the anchor end can move from the hook-up position near the surrounding shoulder to the compressed position far from the surrounding shoulder.
[0010]
The plunger is housed in the passage and, in the use position, the plunger can move along the large diameter segment, and in the disposal position, the plunger cannot move along the large diameter segment and can rotate. The plunger includes a plunger body and a seal member.
[0011]
The plunger body includes a top end wall positioned to face the surrounding shoulder and a bottom end wall extending out of the rear end that is open to allow movement and rotation of 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 toward the bottom end wall and contains fluid in a vacuum.
[0012]
The seal member includes an anchor portion and a seal portion. When the plunger is in the disposal position and when the encircling engagement wall is in the engaging position, clockwise rotation of the plunger body relative to the large diameter segment brings the encircling engagement wall from the engaged position to the released position, which Thus, the anchor end is moved from the hook-up position to the compression position, and the anchor is discarded in a state of being engaged with the anchor end. The seal portion is attached in a sealed state to the inner peripheral edge portion along the seal line so as to retain the fluid in the cavity. The movement of the anchor end from the hook-up position to the compression position compresses the anchor portion to tear the seal line, thereby releasing the seal member from the plunger. Therefore, the tubular needle seat is pulled by the seal member together with the cannula needle, and this seal member is sucked into the cavity by the pressure difference due to the difference between the negative pressure and the ambient pressure introduced from the communication hole, and thereby the cannula needle is inserted into the catheter. It can be pulled out from the tube into the cavity.
[0013]
BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the present invention will become apparent from the detailed description of the preferred embodiment of the invention with reference to the accompanying drawings, in which: FIG.
[0014]
FIG. 1 is a perspective view of a normal venous catheter insertion device.
[0015]
FIG. 2 is a schematic view showing a cannula needle inserted by a normal venous catheter insertion device.
[0016]
FIG. 3 is a partial cross-sectional view showing a first preferred embodiment of the venous catheter insertion device according to the present invention.
[0017]
FIG. 4 is a cross-sectional view showing a use state of the first embodiment.
[0018]
FIG. 5 is a cross-sectional view of the first preferred embodiment with the seal member in contact with the tubular needle seat.
[0019]
FIG. 6 is a cross-sectional view of the first preferred embodiment with the seal member engaged with the tubular needle seat.
[0020]
FIG. 7 is a cross-sectional view of the first preferred embodiment with the seal member released from the plunger body.
[0021]
FIG. 8 is a cross-sectional view of a first preferred embodiment with the tubular needle seat and cannula needle withdrawn into the plunger body.
[0022]
FIG. 9 is a partial sectional view of the first preferred embodiment in another use state.
[0023]
FIG. 10 is a partial cross-sectional view of a second preferred embodiment of the venous catheter insertion device of the present invention.
[0024]
FIG. 11 is a partial sectional view of a third preferred embodiment of the venous catheter insertion device of the present invention.
[0025]
FIG. 12 is a perspective view of a fourth preferred embodiment of the venous catheter insertion device of the present invention.
[0026]
FIG. 13 is a cross-sectional view of a fourth preferred embodiment of the venous catheter insertion device.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Before describing the present invention in detail, it should be noted that the same reference numerals are used throughout the specification to indicate similar elements.
[0028]
Referring to FIGS. 3 and 4, it is shown that the first preferred embodiment of the venous catheter insertion device of the present invention comprises a catheter hub 5, a catheter tube 6, a barrel 2, a needle assembly 3, and a plunger 4. .
[0029]
The catheter hub 5 includes an enclosing tip wall 512, a tube wall 511 opposite the enclosing tip wall 512 along the first axis, and an intermediate tubular wall 512 located between the enclosing tip wall 512 and the tube wall 511.
[0030]
The surrounding tip wall 512 surrounds the first axis and defines a through hole 516 along the first axis. The tube wall 511 has an inner sleeve wall surface that surrounds the first axis and defines an insertion hole 517 that is larger than the through hole 516. The intermediate tube wall 51 has an inner tube wall surface that defines a duct 513 that allows the insertion hole 517 to communicate with the through hole 516, and an outer tube wall surface that radially faces the inner tube wall surface. Further, the intermediate tubular wall 51 has a communication hole 514 that penetrates the inner tube wall surface and the outer tube wall surface in the radial direction for communicating the duct 513 with the outside air. The plug 52 is arranged to close the communication hole 514 as shown in FIG. The inner tube wall surface of the intermediate tubular wall 51 forms a holding shoulder 518 with an enclosing tip wall 512. The holding shoulder 518 faces the duct 513 along the first axis.
[0031]
The catheter tube 6 is disposed in the through-hole 516, communicates with the duct 517 along the first axis, protrudes outside the through-hole 516, and extends from the proximity segment 61 along the first axis. It includes a tip segment 62 that projects outwardly of the surrounding tip wall 512. The proximal segment 61 ends with a flange portion 611 held against the holding shoulder 518.
[0032]
The barrel 2 has inner and outer surrounding barrel wall surfaces 221 and 222 that surround the second axis and face each other. The inner surrounding barrel wall surface 222 defines a passage 21 having a front end port and a rear end port located opposite to each other in a longitudinal direction parallel to the second axis, and defines a rear portion and a front passage, respectively, A large-diameter segment 212 and a small-diameter segment 211 are located close to the front end ports 224 and 223, respectively, and an enclosing shoulder 213 is formed between the large-diameter segment 212 and the small-diameter segment 211. The outer surrounding barrel wall surface 221 can be inserted into the insertion hole 517 so as to be in contact with the inner sleeve wall surface of the sleeve wall 511 in the vicinity of the front end port 223, and thereby the front surrounding in which the first axis and the second axis coincide with each other. A region 2211 is included. The first female screw segment 225 includes a plurality of radial ribs and is disposed on the large diameter segment 212 adjacent to the rear end port 224. A second female screw segment 226 in the spiral groove is disposed on the small diameter segment 211 adjacent to the surrounding shoulder 213.
[0033]
Needle assembly 3 includes cannula needle 32 and tubular needle seat 31.
[0034]
Cannula needle 32 includes opposed tips and fixed ends 321 and 322 and an intermediate segment 323 between the tips and fixed ends 321 and 322.
[0035]
The tubular needle seat 31 is made of a lightweight transparent material, is accommodated in the passage 21, and extends along the second axis. The tubular needle seat 31 extends from the hub end 313 along the second axis to accommodate the fixed end 322 of the cannula needle 32 and accommodates the fixed end 322 of the cannula needle 32. Alternatively, it includes an encircling engagement wall 311 that defines an axial passage communicating therewith. The surrounding engagement wall 311 includes a plurality of ribs arranged at different angles, surrounds the (second) second axis, and engages the second female segment 226 with a screw at the engagement position with a male screw segment 314. The surrounding engagement wall 311 of the tubular needle seat 31 cannot be moved along the second axis with respect to the small-diameter segment 211.
[0036]
The tubular needle seat 31 defines an axial through-hole 3121 that communicates with the passage 21, and includes an anchor segment 312 that extends from the surrounding engagement wall 311 to the outside of the front passage of the small-diameter segment 211 and ends at the anchor end 3122. A third male screw segment 315 includes a plurality of ribs and is disposed on the anchor end 3122.
[0037]
In use, the plunger 4 is movable in the longitudinal direction along the large-diameter segment 212 as shown in FIG. 4, and in the disposal position, as shown in FIG. , And cannot be moved, but is accommodated in the passage 21 so that it can rotate relative to the large-diameter segment 212. The plunger 4 includes a plunger main body 42 and a seal member 43.
[0038]
The plunger main body 42 includes a top end wall 421 disposed away from the surrounding shoulder 213 and a bottom end wall 422 facing the top short wall 421 in the longitudinal direction. The bottom end wall 422 extends outside the rear end port 224 to allow the plunger 4 to rotate. The top end wall 421 has an inner peripheral edge 424 that surrounds the second axis and defines a cavity 41 therein. The cavity 41 extends along the second axis toward the bottom end wall 422 and holds the fluid in a negative pressure state. Furthermore, the plunger body 42 has an outer plunger wall surface 423 surrounding the second shaft. The first male screw segment 425 includes a plurality of ribs and is disposed on the outer plunger wall surface 423. The catheter portion 426 is located at the inner peripheral edge 424 near the bottom end wall 422.
[0039]
The seal member 43 is made of an elastic material and includes an anchor portion 432 and a seal portion 434. The anchor portion 432 has an inner wall that defines a recess 431 that extends along the second axis and is configured to receive and engage the anchor end 3122 of the anchor segment 312. The inner wall is formed with a third female screw segment 433 in the form of a spiral groove. Referring to FIG. 4, the surrounding protrusion 4241 extends from the inner peripheral edge portion 424 in a frictional engagement with the seal portion 434 in the radial direction toward the second axis, thereby providing a seal line for confining the fluid in the cavity 41. Established.
[0040]
As shown in FIG. 4, in use, a nurse holds the barrel 2 with one hand and inserts the tip end 321 of the cannula needle 32 and the catheter tube 6 into the patient's blood vessel. The anchor segment 312 of the tubular needle seat 31 has a convex surface 316 that is light, transparent, and clearly observes blood flowing through the axial through hole 3121.
Once the nurse notices that no blood is flowing into the anchor segment 312, he or she pulls the plunger 4 slightly until blood is visible through the anchor segment 312 to extract the blood and the catheter tube 6 is Make sure that it is properly inserted into the blood vessel. Referring to FIGS. 5 and 6, the plug 52 shown in FIG. 4 is removed from the communication hole 514 to allow the duct 513 to communicate with ambient air. The plunger 4 is pushed forward so as to contact the tubular needle seat 31 (see FIG. 5). The first male and female screw segments 425 and 225 restrict movement of the plunger 4 along the large-diameter segment 212 and allow the plunger 4 to rotate clockwise relative to the large-diameter segment. The plunger 4 is screwed toward the front end port 223. Due to the movement of the plunger 4 by the screw, the seal member 43 rotates relative to the tubular needle seat 31, and the anchor portion 432 of the seal member 43 has male and female screw segments 315 as shown in FIG. 6. , 433 is engaged with the anchor end 3122.
[0041]
Subsequently, as shown in FIG. 7, the plunger 4 further rotates in the clockwise direction relative to the large-diameter segment 212, and the tubular needle seat 31 moves the second male screw segment 314 around the second axis. When rotated to the release position to move from the second female screw segment 226, the surrounding engagement wall 311 of the tubular needle seat 31 moves toward the rear end port 224 along the second axis with respect to the small-diameter segment 211. To do. The anchor end 3122 also rotates and moves from a hook-up position near the surrounding shoulder 213 to a compressed position farther from the surrounding shoulder 213. At the same time, the movement of the anchor end portion 3122 from the hook position to the compression position compresses the anchor portion 432 and peels off the seal line, thereby releasing the seal member 43 from the plunger body 42. In this way, the tubular needle seat 31 is pulled by the seal member 43 together with the needle ak needle 32, and the seal member 43 enters the cavity 41 due to the pressure difference between the ambient air introduced through the communication hole 514 and the negative pressure. Aspirated, thereby allowing withdrawal of the cannula needle 32 from the catheter tube 6 into the cavity, as shown in FIG. Furthermore, the catcher portion 426 prevents the tubular needle seat 31 from hitting the bottom end wall 422 along with the cannula needle 32.
[0042]
Therefore, in use, the nurse can close the communication hole 514 by the plug 52, can pull the plunger 42 on which the seal member 43 and the needle assembly 3 are left toward the rear end port 224, and a small amount of blood can be barreled. The two passages 21 can be extracted through the catheter tube 6. Referring to FIG. 9, the blood collecting member 7 is connected to the catheter hub 5 when the nurse needs to extract a large amount of blood. The blood collecting member 7 defines an accommodation space 71 and includes an enclosure wall 72 having an introduction hole 73 communicating with the accommodation space 71. The first connection flexible tube 81 is connected to the introduction hole 73 and the communication hole 514 and arranged. The blood flows into the blood collecting member 7 through the catheter tube 6, the duct 513 and the first connecting flexible tube 81 without pulling the plunger phone 42, thereby preventing the nurse from touching the blood.
[0043]
Apart from the above, referring to FIG. 10, there is shown a second preferred embodiment similar to the previous embodiment of the venous catheter insertion device according to the present invention. In addition to the elements of the previous embodiment, the inner sleeve wall surface of the sleeve wall 511 of the catheter hub 5 has a re-inlet 515 that is radially communicated with the insertion hole 517 through the sleeve wall 511. And is located on the opposite side of the communication hole 514 with respect to the boundary region 519. Furthermore, the venous catheter insertion device of this embodiment further includes a barrier member 54 and a tubular insert 53. The barrier member 54 is made of an elastic material such as rubber. The tubular insert 53 is connected to the barrier member 54 and defines a front neck end 534 defining a passage 531 along the first axis, and a rear flare end extending from the front neck end 534 and having an inner abutment surface 536. 532. Inner abutment surface 536 defines a fluid passage 535 that surrounds the first axis and extends to communicate with re-inlet 515. Further, the blood collection member 7 has an air outlet 74 away from the inlet 73. A second connecting flexible tube 82 is disposed connecting the air outlet 74 and the re-inlet 515. In assembly, the barrier member 54 on which the front neck is coupled engages the inner sleeve wall surface of the sleeve wall 511 of the catheter hub 5 in the boundary region 519. The front surrounding area 2211 of the barrel 2 engages the inner abutment surface 536 of the tubular insert 53, thereby aligning the passage 531 and the passage 21 of the barrel 2. A cannula needle 32 (not shown in FIG. 10) extends through the passage 531, the slit in the barrier member 54, the duct 513, and the catheter tube 6. After the used needle assembly 3 (not shown in FIG. 10) is pulled into the plunger body (not shown in FIG. 10) in the same manner as described above, the slit of the barrier member 54 uses the elastic material properties. Closed.
[0044]
As described above, when it is confirmed that the blood does not flow into the blood collection member 7 by the arrangement of the barrier member 54, the nurse pulls the plunger main body 42 backward, and the second connecting flexible tube 82 and the re-inlet 515. And air from the air outlet 74 through the flow path 535 into the passage 21 leading to the barrel 2, thereby facilitating the flow of blood to the blood collection member 7.
[0045]
Alternatively, referring to FIG. 11, a third preferred embodiment similar to the configuration of the first embodiment of the venous catheter insertion device according to the present invention is shown. The duct 513 of the catheter hub 5 communicates with the passage 21 of the barrel 2 through the tubular insert 55. The tubular insert is connected to the barrier member 54 and has a front neck end 554 that defines a passage along the axis and a rear flare end 552 that extends from the front neck end 554 along the first axis. The rear flare end 552 has an inner abutment surface that surrounds the first axis and defines the flow path 551, and a re-inlet 555 that extends in the radial direction so as to communicate with the flow path 551. The front surrounding area 2211 of the barrel 2 engages the inner abutment surface of the tubular insert 55. Thus, as in the second preferred embodiment, after the used needle assembly 3 is withdrawn into the plunger body 42, the slit of the barrier member 54 is closed utilizing the properties of the elastic material.
[0046]
Referring to FIGS. 12 and 13, a fourth preferred embodiment of the venous catheter insertion device of the present invention is shown and includes a barrel 9 that is shorter than the previous embodiment. The barrel 9 also includes a small diameter segment and a large diameter segment 91, 92 and has an inner surrounding barrel wall surface 936 that defines a front end port and a rear end port 931, 932. The sleeve wall 511 of the catheter hub 5 is moved to engage the front end port 931. The large diameter segment 92 has a male screw segment 935 and engages with a female screw segment 425 formed on the outer plunger wall surface of the plunger 4. Thus, in use, the nurse has an outer surrounding barrel wall 934 and can insert the cannula needle 32 along with the catheter tube 6 into the patient's blood vessel so that blood flows into the barrel 9. The cannula needle 32 is then withdrawn into the cavity 41 of the plunger 4 in a manner similar to that described above and can be safely discarded.
[0047]
In addition, a tip protector 33 is mounted to shield the cannula needle 32 and catheter hub 5 and has a large diameter opening for insertion of the front half of the barrel 9. Thus, the cannula needle 32 and the plunger 4 are completely shielded by the tip protector 33 to prevent the caregiver from contacting the interior.
[0048]
As shown, the venous catheter insertion device of the present invention has the following effects.
[0049]
1. After inserting the cannula needle 32, the used needle assembly 3 can be extracted into the cavity 41 of the plunger body 42 by rotating the plunger body 42 clockwise relative to the large diameter segment 212. This facilitates safe disposal of the venous catheter insertion device.
[0050]
2. Since the anchor segment 312 of the tubular needle seat 31 is light, transparent, and has a convex surface, the nurse can observe the blood flow through the axial through hole 3121 in a safe state.
[0051]
3. After the used needle assembly 3 is withdrawn into the cavity 41, the nurse removes the plunger body 42 without removing the barrel 2 and catheter hub 5 to collect blood into the passage 21 or into the blood collection member 7. It can be pulled directly, thereby reducing the likelihood that the nurse will be in direct contact with the blood.
[0052]
While the invention has been described in conjunction with what appears to be the most practical and preferred embodiments, the invention is not limited to the disclosed embodiments, and is intended to be a variety of within the spirit of the broadest interpretation. It is intended to cover the device.
[Brief description of the drawings]
FIG. 1 is a perspective view of a conventional venous catheter insertion device.
FIG. 2 is a schematic view showing a cannula needle inserted by a normal venous catheter insertion device.
FIG. 3 is a partial sectional view showing a first preferred embodiment of the venous catheter insertion device according to the present invention.
FIG. 4 is a sectional view showing a usage state of the first embodiment.
FIG. 5 is a cross-sectional view of the first preferred embodiment with the seal member in contact with the tubular needle seat.
FIG. 6 is a cross-sectional view of a first preferred embodiment with the seal member engaged with a tubular needle seat.
FIG. 7 is a cross-sectional view of the first preferred embodiment with the seal member released from the plunger body.
FIG. 8 is a cross-sectional view of a first preferred embodiment with the tubular needle seat and cannula needle withdrawn into the plunger body.
FIG. 9 is a partial cross-sectional view of the first preferred embodiment in another use state.
FIG. 10 is a partial sectional view of a second preferred embodiment of the venous catheter insertion device of the present invention.
FIG. 11 is a partial sectional view of a third preferred embodiment of the venous catheter insertion device of the present invention.
FIG. 12 is a perspective view of a fourth preferred embodiment of the venous catheter insertion device of the present invention.
FIG. 13 is a cross-sectional view of a fourth preferred embodiment of a venous catheter insertion device.
[Explanation of symbols]
2,9 barrel 21 passage 211, 91 small diameter segment 212, 92 large diameter segment 221 outer surrounding barrel wall 222 inner surrounding barrel wall 2211 front surrounding area 32 cannula needle 31 tubular needle seat 312 anchor portion 3122 anchor end 311 surrounding engagement wall 321 322 Fixed end 313 Hub end 3121 Axial through hole 323 Intermediate segment 4 Plunger 42 Plunger body 41 Cavity 421 Top end wall 422 Bottom end wall 43 Seal member 5 Catheter hub 51 Intermediate tubular wall 511 Sleeve wall 512 Surrounding tip wall 513 Duct 514 Communication port 516 Through hole 517 Insertion hole 518 Holding shoulder 519 Boundary region 6 Catheter tube 61 Proximal segment 611 Flange 62 Lead end segment

Claims (10)

An enclosing tip wall (512) surrounding the first axis and defining a through hole (516) along the first axis;
A sleeve wall (511) having an inner sleeve wall surface facing the surrounding tip wall (512) along the first axis and surrounding the first axis, and defining an insertion hole (517) larger than the through hole (516). When,
A duct (513) that is located between the surrounding tip wall (512) and the sleeve wall (511) and communicates with the insertion hole (517) is defined by the through hole, and the duct (513) is formed in the atmosphere. A catheter hub (5) comprising an intermediate tubular wall (51) having a communication port (514) having a removable plug (52) extending through the interior in communication with
A proximity segment (61) located in the through hole (516) and extending along a first axis and communicating with the duct (513); and the surrounding tip wall (61) extending from the proximity segment along the first axis 512) a catheter tube (6) including a distal segment (62) projecting outwardly from
Front end openings facing each other and having inner and outer surrounding barrel wall surfaces (221, 222) surrounding the second axis, the inner surrounding barrel wall surfaces (222) being positioned to face each other in the longitudinal direction along the second axis And a passage (21) having a rear end port (223, 224, 931, 932), and the inner surrounding barrel wall surface (222) defines a front side and a rear side passage, respectively, and the front end port and the rear end port The large-diameter segment (212, 92) and the small-diameter segment (212, 92) and the small-diameter segment (212, 92) and the small-diameter segment (211, 91), respectively. 211, 91), and the outer surrounding barrel wall surface (221) is fixed to the inner sleeve wall surface in the vicinity of the front end opening (223, 931), so that the first axis and the second axis coincide with each other. To do A barrel (2, 9) with the the front surrounding region (2211),
A cannula needle (32) including a fixed end (321, 322) opposite the tip and an intermediate segment (323) positioned between the tip and the fixed end;
A tubular needle seat (31) housed in the passage (21) along the second axis,
A hub end (313) positioned to secure the fixed end (322);
An encircling engagement wall (311) extending along the second axis from the hub end (313) and defining a passage for receiving or communicating with the fixed end 322, the encircling engagement wall (311) An engagement position having an outer engagement wall surface surrounding the second axis and being movable or non-movable along the second axis around the second axis with respect to the small-diameter segment (211, 91), An encircling engagement wall (311) that is rotatable with respect to the release position;
An anchor segment (312) defining an axial through hole (3121) communicating with the passage (21) and extending from the surrounding engagement wall (311) to the outside of the front passage, the anchor segment (312) ) From the hook-up position near the surrounding shoulder (213) to the compressed position far from the surrounding shoulder when the surrounding engagement wall rotates clockwise from the engagement position to the release position. The tubular needle seat (31) comprising an anchor segment (312) terminating in an anchor end (3122) rotated with the surrounding engagement wall (311) to move;
In the use position, it can move along the large-diameter segment (212, 92) in the longitudinal direction, and in the disposal position, it cannot move along the large-diameter segment and can rotate relative to the large-diameter segment A plunger (4) received in the passage (21),
A top end wall (421) positioned opposite the surrounding shoulder (213) and a bottom end wall (422) opposite to the top end wall in the longitudinal direction, the bottom end wall being the plunger ( 4) The outer peripheral edge that extends outside the rear end opening (224, 932) to allow movement and rotation, the top end wall (421) surrounds the second axis and defines the cavity (41) therein A plunger having a portion (424), the cavity (41) extending along the second axis to the bottom end wall (422) to hold the fluid under negative pressure;
An anchor portion (432) disposed to be engageable with the anchor end portion (3122), wherein the plunger (4) is in a disposal position and the surrounding engagement wall (311) is in an engagement position. , Clockwise rotation of the plunger body (42) with respect to the large-diameter segment (212, 92) moves the surrounding engagement wall (311) from the engaged position to the released position, thereby causing the anchor end (3122) to move. An anchor portion (432) adapted to move the hook from the hook-up position to the compression position;
A seal (434) attached to the inner peripheral edge (424) for sealing along a seal line to retain fluid in the cavity (41), the seal line being at the anchor end The movement from the hook-up position to the compression position of (3122) compresses the anchor portion (432) so as to peel off the seal line, thereby releasing the seal member (43) from the plunger body (42). The sealing member (31) in which the tubular needle seat (31) with the cannula needle (32) is sucked into the cavity (41) by the pressure difference between the negative pressure and the atmospheric pressure introduced through the communication port (514). 43), which allows the cannula needle (32) to be withdrawn from the catheter tube (6) into the cavity (41). Sealing member comprising a pole tip (43),
A venous catheter insertion device characterized by comprising: The surrounding region (2211) of the outer surrounding barrel wall surface (221) is inserted into the insertion hole (517) so as to contact the inner sleeve wall surface of the sleeve wall of the catheter hub (5),
The plunger body (42) has an outer plunger wall surface surrounding a second axis;
The venous catheter insertion device further includes first male and female screw segments (425, 225) disposed on the outer plunger wall surface (423) and the large diameter segments (212, 92), respectively, and the plunger body (42) is restrained from moving along the large-diameter segments (212, 92), and the plunger body (42) is allowed to rotate clockwise relative to the large-diameter segments (212, 92). The venous catheter insertion device according to claim 1, characterized in that: Furthermore, as the outer engaging wall can rotate relative to the small diameter segment (211,91), a second male which are respectively disposed on the smaller-diameter segment and the outer engaging wall (211,91) 3. A venous catheter insertion device according to claim 2, characterized in that it comprises a mold and a female screw segment (314, 226). It said anchor portion (432) has an inner wall extending along a second axis that defines a recess (431) which is shaped to accommodate an anchor end (3122), the intravenous catheter insertion device, the anchor An end (3122) and a third male and female screw segment (315, 433) respectively disposed on the inner wall, the third male and female screw segments being relative to each other; 4. The venous catheter insertion device according to claim 3, wherein the rotation causes the anchor portion (432) to move to engage the anchor end (3122). Furthermore, it has an enveloping projection (4241) arranged to extend radially from the inner peripheral edge (424) toward the second axis, and is in frictional contact with the seal (434), thereby The venous catheter insertion device according to claim 4, wherein a seal is established. An inner sleeve wall surface of the sleeve wall (511) defines a boundary region surrounding the first axis, communicates with the insertion hole (517) through the sleeve wall (511), and with respect to the boundary region (519). A reinlet (515) opposite the communication port (514), the venous catheter insertion device comprising:
A barrier member (54) engaged with the inner sleeve wall surface in the boundary region;
A front neck end (534) connected to the barrier member (54) and defining a through-passage along a first axis; and extending along the first axis from the neck end (534) and contacting the inner side A rear flare end (532) having a surface (536), the inner abutment surface (536) defining a flow path (535) surrounding the first axis and extending to communicate with the re-inlet (515). And the inner abutment surface (536) engages the front surrounding area (2211) of the outer surrounding barrel wall surface (221) of the barrel (2) , whereby the through passage (531) and the barrel (2 And a tubular insert (53) adapted to extend through the passage (531) and to extend outside the catheter tube (6). The venous catheter insertion device according to claim 1. An inner wall surface (222) defining a passage (21) extending in the longitudinal direction and having a front end and a rear end (223, 224, 931, 932) opposite to each other in the longitudinal direction; and a front end (223, 931) a barrel (2, 9) having an outer surrounding barrel wall with a front surrounding area (2211) proximate to 931);
A cannula needle (32) removably received in the front end (223, 931);
It is accommodated in the passage (21) so as to be movable in the longitudinal direction, and extends outside the rear end opening (224, 932) so that manual operation is possible, and has a cavity (41) extending in the longitudinal direction. The cannula needle (32) is held and connected in the passage (21) with the cannula needle (32), and the cannula needle (32) is exposed to a suction force due to a pressure difference between atmospheric pressure and reduced pressure. ) With a plunger (4) to be retracted into the venous catheter insertion device,
A catheter hub (5);
An enclosing tip wall (512) surrounding a shaft and defining a through hole (516) extending along the longitudinal axis;
A sleeve wall that has an inner sleeve wall surface that faces the surrounding tip wall (512) along the axis and surrounds the shaft and that defines an insertion hole (517) larger than the through hole (516). The inner sleeve wall surface is adapted to be secured to the front enclosure region (2211) of the outer enclosure barrel wall surface (221) of the barrel (2) to align the passage (21) with the through hole (516). Sleeve wall and
A duct (513) located between the surrounding tip wall (512) and the sleeve wall (511) and communicating the insertion hole (517) with the through hole (516); Is secured to the front enclosure area (2211) of the outer enclosure wall wall (221) of the outer enclosure barrel wall (221) of the barrel (2) and is adapted to pass a cannula needle, allowing the duct (513) to communicate with the atmosphere and be removed An intermediate tubular wall (51) having a communication hole (514) with a flexible plug (52);
A proximity segment (61) located in the through hole (516) and extending along the axis to communicate with the duct (513), and the surrounding tip wall (512) extending from the proximity segment (61) along the axis And a tip segment (62) projecting outward from the cannula needle (32) when inserted into the cannula needle (32) and allowing the cannula needle to pass through the duct (513). A catheter tube (6) extending outwardly thereof;
A venous catheter insertion device for use with a disposable syringe. The intermediate tubular wall (51) has an inner tubular wall defining the duct (513) and an outer tubular wall radially facing the inner tubular wall, the inner tubular wall being the surrounding tip wall (512). A holding shoulder (518), the holding shoulder (518) faces the duct along an axis, and the proximity segment (61) protrudes outside the through hole (516). 8. The venous catheter insertion device according to claim 7, wherein the venous catheter insertion device extends along an axis, contacts the holding shoulder, and terminates at a flange portion (611) held by the holding shoulder. The inner sleeve wall surface defines a boundary region (519) surrounding the shaft, communicates with the insertion hole (517) extending radially through the sleeve wall (511), and communicates with the boundary region (519). On the other hand, it has a re-inlet (515) located on the opposite side of the communication hole (514),
The venous catheter insertion device further comprises a barrier member (54) made of an elastic material and engaging the inner sleeve wall surface in the boundary region (519);
It has a front neck end (534) that is connected to the barrier member (54) and defines a passage (531) in the axial direction, and an inner abutment surface (536), and extends axially from the neck end (534). The inner abutment surface (536) defines a flow path (535) extending around the shaft and in communication with the re-inlet (515), having an extended rear flare end (532). The face (536) is adapted to engage the front surrounding area (2211) of the outer surrounding barrel wall (221) of the barrel (2), whereby the cannula needle (32) passes through the passage (531). 9. A tubular insert (53) adapted to align the passage (531) with the passage (21) of the barrel (2) so as to extend outside the catheter (6). Venous catheter insertion Location. The inner sleeve wall surface defines a boundary region surrounding the shaft;
The venous catheter insertion device further includes a barrier member (54) that engages an inner sleeve wall surface in the boundary region;
A front neck end (554) connected to the barrier member (54) and defining a passage along an axis, and a rear flare end (552) extending from the front neck end (554) along the axis The rear flare end (552) surrounds the shaft and extends in the radial direction in communication with the inner abutment surface defining the flow path (551) and the flow path (551). On the other hand, it has a re-inlet (555) on the side opposite to the communication hole (514), and the inner contact surface of the flare end (552) is the front side of the outer surrounding barrel wall surface (221) of the barrel (2). Engaged with the enclosed region (2211), thereby extending the passageway of the barrel (2) so that the cannula needle (32) extends through the passageway (531) to the outside of the catheter (6). Tubular in-line adapted to align with the passage (21) Over preparative (55) and the intravenous catheter insertion device according to claim 8, characterized in that it comprises a.

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