CN100569305C - Intravenous injection catheter guiding device - Google Patents

Abstract

The invention discloses a guiding device of an intravenous injection catheter, which comprises a hollow barrel, a needle seat which is inserted into the barrel and can move along an axial direction, a needle body which is combined with the needle seat and extends forwards to penetrate out of the barrel to form a using state, and a catheter component which is detachably sleeved at one end of a small-diameter section of the barrel and is used for the needle body to penetrate forwards. The detaching part is provided with a front positioning hole formed on a large-diameter section of the tube barrel, a convex bolt which extends in the radial direction and can be matched with the front positioning hole, and a poking control part which can control the convex bolt to be separated from the front positioning hole, so that the needle base can drive the needle body to move to be hidden in the tube barrel along the axial direction.

Description

IV Catheter Guides

technical field

The invention relates to a guiding device, in particular to an intravenous injection catheter guiding device which can withdraw and hide a needle body.

Background technique

Referring to FIG. 1 and FIG. 2 , the intravenous syringe shown in US Pat. No. 5,989,220 mainly includes a tube body 10 surrounding a return member 11 . The return member 11 has a front end 111 that fixes a needle body 12 and passes through the tubular body 10, and a rear end 112 embedded in the tubular body 10. The front end 111 and a stem 13 respectively have An engaging surface 111I, 131 is relatively formed with frictional resistance to overcome the spring tension of the restoring member 11 and prevent the tube base 13 from moving backward. A spring 15 is compressed and abuts against a front wall 101 of the tube body 10 and a stepped edge 113 of the return member 11 . In use, the needle body 12 extending through a flexible catheter 14 is inserted into a patient's blood vessel to guide the catheter 14 into the blood vessel to deliver medicine or infusion.

When the tube base 13 is forced to be separated from the front end 111 of the return member 11 and disengaged from the connecting surface 111I, the return member 11 will be pushed up by the spring 15 and automatically drive the needle body 12 back to the Inside the tube body 10. However, when the medical personnel use their hands to apply force to operate the tube base 13 to unload the return member 11 and the needle body 12, it is easy to vibrate, and the accident that the needle body 12 penetrates the blood vessel causes the patient to feel pain, and the There are safety concerns in use.

Contents of the invention

The purpose of the present invention is to provide an intravenous injection catheter guide device that can be easily operated with one hand and withdraw a needle safely.

The present invention is characterized in that: the intravenous catheter guiding device comprises a tube barrel, a needle body, a needle seat, a detaching part, a catheter seat and a catheter. The pipe tube has a front open end and a rear open end corresponding to each other along an axis direction, and a pipe wall connecting the front and rear open ends. The small pipe diameter section and the large pipe diameter section of the open end surround the axis and define with the front and rear open ends an inner surface of a pipeline and an outer surface opposite to the inner surface. The needle body has a front section terminated at a front end, and a rear end extending along the axis direction and opposite to the front end. The needle holder has a front end and a rear end extending along the axis, the rear end is accommodated in the tube pipe, and can slide to adjacent positions along the axis with respect to the tube wall. The front open end and the rear open end, the front end is connected to the rear end of the needle, when the needle seat is positioned in front of the tube, the front section of the needle passes through the front open end of the tube and Extending forward and being in use, when the needle base is positioned at the rear of the tube, the needle is retracted and hidden in the tube of the tube, and is in a recovered state, and the rear end is Surrounding the axis and defining a chamber connected with the needle body. The detachable part can be displaced along the axial direction relative to the needle seat when the rear end of the needle seat is at the front position, and has a front positioning hole, a protruding bolt and a dial control. The front positioning hole runs through the inner and outer surfaces of the pipe wall from the large pipe diameter section of the pipe barrel. The protruding bolt can be clamped to fix the rear end of the needle holder, and radially passes through the large diameter section of the tube through the front positioning hole. The dial control is arranged outside the barrel and connected with the protruding bolt, and can be displaced through the front positioning hole, so that the needle base can be displaced to the rear position along the axial direction. The catheter adapter has an annular wall that can be displaced along the axial direction to be unloaded from the front end of the needle adapter and defines a conveying path, an end portion that is opposite to the annular wall and extends along the axial direction, and along the axial direction A perforation extending and communicating with the conveying channel allows the front section of the needle body to pass through the perforation. The catheter has an adjoining section that is inserted into the through hole of the catheter adapter and extends along the axis direction to communicate with the delivery channel, and a front end section that extends from the adjoining section along the axis direction and passes through the end of the catheter adapter , when the needle body is placed in the use state, the catheter surrounds the front section of the needle body, and the front end of the needle body passes through the front end section of the catheter forward.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a sectional view illustrating the use state of a general intravenous syringe;

Fig. 2 is a sectional view illustrating that a general intravenous syringe withdraws a needle body;

Figure 3 is an exploded view illustrating a first preferred embodiment of an IV catheter guide device of the present invention;

Fig. 4 is a sectional view illustrating the use state of the first preferred embodiment;

Fig. 5 is a sectional view illustrating the withdrawal of a needle in the first preferred embodiment;

Figure 6 is a cross-sectional view illustrating a second preferred embodiment of an intravenous catheter guide device of the present invention;

Fig. 7 is a sectional view illustrating the withdrawal of a needle in the second preferred embodiment;

Figure 8 is a cross-sectional view illustrating a third preferred embodiment of an intravenous catheter guide device of the present invention;

Fig. 9 is a side view illustrating the withdrawal of a needle in the third preferred embodiment;

Figure 10 is a cross-sectional view illustrating a fourth preferred embodiment of an intravenous catheter guide device of the present invention;

Fig. 11 is a sectional view illustrating the withdrawal of a needle in the fourth preferred embodiment;

Figure 12 is an exploded view illustrating a fifth preferred embodiment of an IV catheter guide device of the present invention;

Fig. 13 is a sectional view illustrating a sixth preferred embodiment of an intravenous catheter guide device of the present invention.

Detailed ways

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 3 and FIG. 4 , the first preferred embodiment of the catheter guiding device for intravenous injection of the present invention includes a barrel 2 , a needle hub 3 , a needle body 5 , and a catheter assembly 4 .

The tube 2 has a front open end 224 and a rear open end 223 corresponding to each other along an axial direction, and a tube wall 22 connecting the front and rear open ends 224 and 223 . The pipe wall 22 has a small pipe diameter section 228 and a large pipe diameter section 229 corresponding to each other along the axial direction and adjacent to the front and rear open ends 224, 223 respectively, surrounding the axis and connected to the front and rear open ends 224, 223, 223 defines an inner surface 221 of a pipe 21 and an outer surface 222 opposite to the inner surface 221 .

A detaching member includes a guide groove 23 that runs through the inner and outer surfaces 221, 222 of the pipe wall 22 and extends along the axial direction relative to the large pipe diameter section 229. The guide groove 23 starts from a front positioning hole 231 and It terminates in a rear positioning hole 232 and has two constrictions 24, 25 adjoining the front and rear positioning holes 231, 232, respectively.

The needle body 5 has a front section 51 terminated at a front end 52 , and a rear end 53 extending along the axial direction and opposite to the front end 52 .

The needle base 3 is inserted into the pipe 21 by the rear open end 223 of the tube barrel 2, and the rear open end 223 is closed by an end cap 26, and can be adjacent to the front end along the axial direction relative to the pipe wall 22. The open end 224 slides between the rear open end 223 . The needle base 3 has a front end 31 fixed to the rear end 53 of the needle body 5 . Referring to FIG. 4 , when the needle hub 3 is positioned in front of the barrel 2 , the front section 51 of the needle body 5 passes through the front open end 224 of the barrel 2 and extends forward, and is in use. Referring to FIG. 5 , when the needle hub 3 is positioned behind the barrel 2 , the needle body 5 is retracted and hidden in the pipe 21 of the barrel 2 , and is in a recovered state.

The needle hub 3 also has a rear end portion 32 extending from the front end portion 31 along the axial direction and accommodated in the tube 21 of the barrel 2 opposite to the large diameter section 229 . The rear end portion 32 surrounds the axis and defines a chamber 36 communicating with the needle body 5 . More than one air-permeable element 37 is a kind of porous material, and is engaged with the rear end portion 32 to close the chamber 36, allowing air to circulate and inhibiting the speed of blood circulation. In addition, the needle holder 3 has a blood-display window 38 connecting the front end 31 and the rear end 32 , the blood-display window 38 communicates with the needle body 5 and the chamber 36 , and can observe blood circulation.

The detaching member has a protruding bolt 33 that can be manipulated and radially passes through the outer surface 222 of the tube 2 from the rear end portion 32 . When the needle base 3 slides from the front position of the barrel 2 to the rear position, the protrusion 33 is slidably slid along the guide groove 23 from the front positioning hole 231 to the rear positioning hole 232, thereby, the The protruding bolt 33 located between the large pipe diameter section 229 and the rear end 32 can engage with the front positioning hole 231 or the rear positioning hole 232 for positioning.

When the needle hub 3 is displaced along the axial direction relative to the barrel 2 to a position adjacent to the front or rear respectively, the protrusion 33 of the needle hub 3 is constrained by one of the constricted portions 24, 25. At this time, As long as the protrusion 33 is forced to pass through the constriction 24 or the constriction 25, the protrusion 33 can be inserted into the corresponding front positioning hole 231 or rear positioning hole 232, so as to position the needle hub 3 in the corresponding position. front position or rear position.

The large pipe diameter section 229 also has a gap 27 extending from the rear positioning hole 232 to the rear open end 223 and communicating with the guide groove 23, so that the protruding bolt 33 can be forced through the rear constriction through the gap 27. 25, and slide smoothly in the guide groove 23. And the end cap 26 closes the rear open end 223 and the gap 27, and can position the rear open end 223 so that the large pipe diameter section 229 maintains its original shape and does not deform.

A dial control 34 is formed at one end of the protruding bolt 33 that can be touched and moved, and obediently slides on the outer surface 222 of the tube 2, whereby the protruding bolt 33 can be removed from the front positioning hole 231, The needle holder 3 is displaced to the rear position along the axial direction according to the guide groove 23 .

A catheter assembly 4 has a catheter hub 41 , a catheter 43 , and a needle sheath 45 .

The catheter adapter 41 has an annular wall 411 extending along the axial direction and defining a delivery channel 412 , and an end portion 413 extending along the axial direction relative to the annular wall 411 and defining a through hole 414 . The ring wall 411 is socketed with the small diameter section 228 of the tube 2 , so that the front section 51 of the needle body 5 passes through the through hole 414 .

The catheter 43 has an adjoining section 431 inserted into the through hole 414 and extending along the axis direction to communicate with the delivery channel 412 , and the adjoining section 431 extends along the axis direction and passes through the end of the catheter adapter 41 A front end section 432 of 413, when the needle body 5 is placed in the use state, the conduit 43 surrounds the front section 51 of the needle body 5, so that the front end 52 of the needle body 5 passes through the front end section 432 of the conduit 43 forward.

When in use, the needle sheath 45 is removed first, and the front end 52 of the needle body 5 is used to puncture the patient's venous blood vessel, and guide the catheter 43 into the venous blood vessel. At this time, the blood flowing into the chamber 36 of the needle base 3 can be displayed on the blood display window 38 for the medical staff to confirm whether the needle body 5 is properly punctured into the vein. Referring to FIG. 5 , then, the medical personnel can compress the venous vessel with one hand while holding the catheter adapter 41 , hold the tube wall 22 of the tube barrel 2 with the other hand, and exert force to remove the tube barrel 2 from the catheter adapter 41 . At the same time, use a finger holding the tube wall 22 to move the dial control 34, so that the protrusion 33 drives the needle holder 3 to move to the rear position along the guide groove 23, and the needle body is moved from the front open end 224. 5. The front section 51 is withdrawn until it is hidden in the tube tube 2 and is located in the recovery state, meeting the requirements of safety in use. Then, the drip infusion line is sleeved on the catheter base 41 to perform drip infusion therapy. Before the infusion line is socketed, the catheter adapter 41 is socketed with a blood pumping tube, and blood is drawn for clinical testing.

When in use, the medical staff can hold the tube 2 with one hand, and operate the dial control 34 with fingers, so that the needle holder 3 drives the needle body 5 to move to the rear position to the pipe 21 hidden in the tube 2. Inside. Therefore, medical staff can achieve the purpose of isolating and hiding the needle body 5 immediately after the needle body 5 is pulled out of the patient's blood vessel by one-handed operation, avoiding the risk of injury and infection of the operator.

Referring to Fig. 6 and Fig. 7, it is the second preferred embodiment of the present invention, which is roughly the same as the first preferred embodiment, except that:

The barrel 2 also has several ribs 227 formed on the inner surface 221 and adjacent to the large diameter section 229 and the small diameter section 228 . The needle hub 3 also has a ring 323 formed on the rear end 32 and facing the rib 227 to define a space for accommodating elastic elements. And the protrusion 33 radially passes through the tube 2 from the position of the rear end 32 adjacent to the ring 323 .

The front positioning hole 231 of the unloading part is formed by a front end 231I of the guide groove 23 extending laterally along the tube wall 22 to form a positioning portion 231II, and the constricted portion 24 is formed between the front end 231I of the guide groove 23 and the positioning portion. Room 231II. The protruding bolt 33 is locked against the positioning portion 233II, and the needle hub 3 is positioned in front of the barrel 2 . The spring 7 is arranged in the aforesaid accommodating space in a compressed state, and has two top ends abutting against the rib 227 and the ring edge 323 respectively, so that the needle body 5 can press the dial control 34 by elastic restoring force. When the protruding bolt 33 is driven away from the positioning portion 231II, the front end 231I is displaced along the guide groove 23 to be hidden in the pipe 21 of the tube tube 2 .

Referring to Fig. 8 and Fig. 9, it is the third preferred embodiment of the present invention, which is roughly the same as the first preferred embodiment, except that:

The detaching part also has two front positioning holes 231 formed on the large pipe diameter section 229, and the toggle control is two buckles 6 that act on the principle of leverage, and each buckle 6 is pivotally arranged on a fulcrum 63 The outer surface 222 of the tube 2 has a pressing end 61 forming a protruding bolt 33, and a driving end 62 opposite to the pressing end 61 relative to the fulcrum 63, so that the protruding bolt 33 can be disengaged in the radial direction the tubing 21 of the barrel 2, and release the needle hub 3.

The elastic element is a spring 7 disposed in the accommodating space, and has two top ends abutting against the rib 227 and the ring 323 respectively. When the needle hub 3 is located at the front position, the spring 7 is in a compressed state and accumulates an elastic restoring force. When the medical personnel touch the driving end 62 with their fingers at the same time, the protruding bolt 33 is smoothly moved radially. When detached from the pipe 21 of the barrel 2, the needle holder 3 will be pushed backward by the elastic restoring force, and drive the needle body 5 to hide to the position of recovery state. In this way, the needle body 5 can be prevented from vibrating during the recovery process, so as to help alleviate the patient's pain.

It is worth mentioning that although this embodiment includes two buckles 6 , a single buckle 6 can also achieve the aforementioned functions of positioning and releasing the needle holder 3 .

Referring to Fig. 10 and Fig. 11, it is the fourth preferred embodiment of the present invention, which is roughly the same as the second preferred embodiment, except that:

The rear end 32 of the needle holder 3 and the inner surface 221 of the tube 2 relative to the large diameter section 229 are respectively formed with a radially extending ring 39 and a rear ring 220 extending along the axial direction, The ring 39 , the rear ring 220 and the rear end 32 define an accommodation space.

A spring 7 is accommodated in the aforesaid accommodating space, and has a front end and a rear end respectively fastened to the ring 39 and the rear ring 220 . Thereby, when the needle holder 3 is located at the front position, the spring 7 is stretched by the needle holder 3, so that the needle body 5 can drive the protrusion on the dial control 34 after the needle body 5 is used. 33 disengages from the positioning portion 231II, and is displaced along the guide groove 23 by the front end 231I.

Referring to Fig. 12, it is a fifth preferred embodiment of the present invention, which is roughly the same as the aforementioned preferred embodiments, except that:

The small diameter section 228 of the barrel 2 is formed with an enlarged front open end 224 , and the front end 31 and the rear end 32 of the needle holder 3 are detachable. In particular, the needle holder 3 also has a connecting portion 35 extending forward from the rear end portion 32 along the axial direction and defining an axial channel 351 to communicate with the chamber 36, and the detachable The front end portion 31 extends rearward along the axial direction and forms a set portion 30 of a set piece 44 . The fitting portion 30 is fitted with the connecting portion 35 by the front open end 224 of the barrel 2 along the axial direction, so that the needle body 5 and the chamber 36 communicate with each other. In this way, when the catheter assembly 4 is combined with the sleeve 44 , it can cooperate with the needle body 5 to form a functional unit 40 of a detachable intravenous injection catheter, so as to cooperate with catheters of different diameters in clinical practice.

Referring to Fig. 13, it is the sixth preferred embodiment of the present invention, which is roughly the same as the fourth and fifth preferred embodiments, except that:

The rear end 32 of the needle hub 3 and the end cover 26 also have inner ring ribs 324 , 261 respectively surrounding the axis and facing each other.

The spring 7 also has a front end fixed to the inner ring rib 324 of the rear end portion 3 of the needle holder 3 and a rear end fixed to the inner ring rib 261 of the end cover 26 . Thereby, when the needle holder 3 is located at the front position, the spring 7 is stretched by the needle holder 3, so that the needle body 5 can be hidden to the recovered state by the elastic restoring force after use.

Claims (14)

1. An intravenous catheter guide device comprising: A pipe tube has a front open end and a rear open end corresponding to each other along an axis direction, and a pipe wall connecting the front and rear open ends. the smaller diameter section and the larger diameter section of the rear open end, encircling the axis and defining with the front and rear open ends an inner surface of a duct, and an outer surface opposite the inner surface; a needle body having a front section terminating at a front end, and a rear end extending along the axis direction and opposite to the front end; A needle holder, which has a front end and a rear end extending along the axis direction and respectively inserted in the small diameter section and the large diameter section of the tube, and a needle connecting the front end and the rear end A blood display window, the rear end can slide relative to the tube wall along the axial direction to be adjacent to the front open end and the rear open end respectively, the front end is connected to the rear end of the needle body, when the needle When the seat is positioned at the front of the tube, the front section of the needle passes through the front open end of the tube and extends forward, and is in use. When the needle seat is positioned at the rear of the tube, the needle The body is retracted and hidden in the pipe of the barrel, and is in a recovery state, and the rear end surrounds the axis and defines a chamber that communicates with the needle body; A detachable member is displaceable relative to the needle hub along the axis when the rear end of the needle hub is at the front position, and has, A front positioning hole, through which the large pipe diameter section of the pipe barrel penetrates the inner and outer surfaces of the pipe wall; a protruding bolt, which can be clamped and fixed to the rear end of the needle seat, and radially passes through the large diameter section of the tube through the front positioning hole; A dial control is arranged outside the barrel and connected with the protruding bolt, and can be displaced through the front positioning hole, so that the needle seat can be displaced to the rear position along the axis direction; A catheter hub, having an annular wall that can be displaced along the axial direction to disengage from the front end of the needle hub and defines a delivery path, an end portion that is opposite to the annular wall and extends along the axial direction, and along the axis a perforation extending in the direction and communicating with the conveying channel, so that the front section of the needle body passes through the perforation; A catheter having an adjoining section inserted into the through hole of the catheter adapter and extending along the axis direction to communicate with the delivery channel, and a front end extending from the adjoining section along the axis direction and passing through the end of the catheter adapter section, when the needle body is placed in the use state, the catheter surrounds the front section of the needle body, and makes the front end of the needle body pass through the front end section of the catheter forward. 2 . The catheter guiding device for intravenous injection as claimed in claim 1 , wherein the needle hub further has at least one air-permeable part engaged with the rear end to close the chamber. 3 . 3. The IV catheter introducer of claim 2, wherein the gas permeable member is a porous material. 4. The catheter guiding device for intravenous injection according to claim 1, characterized in that: the large diameter section is formed with a guide groove extending along the axis direction and penetrating the inner and outer surfaces of the tube wall, the guide groove is formed Starting from the front positioning hole and ending in a rear positioning hole, the protrusion is radially pierced through the outer surface of the barrel from the rear end of the needle holder, when the rear end of the needle holder slides from the front position to the rear position, the protruding bolt slides along the guide groove from the front positioning hole to the rear positioning hole, and the dial control is formed at one end of the protruding bolt that can be moved by touch, and obediently slides on the tube cylinder outer surface. 5 . The intravenous catheter guiding device according to claim 4 , wherein the large-diameter section further has a gap extending from the rear positioning hole of the guide groove to the rear open end. 6 . 6. The IV catheter guiding device as claimed in claim 4, wherein the guide groove has two constricted portions respectively adjacent to the front positioning hole and the rear positioning hole, when the male plug is forced through one of the constricted portions The protruding bolt is inserted into one of the corresponding front positioning hole and rear positioning hole, so that the needle holder is positioned at one of the front position and the rear position. 7. The catheter guiding device for intravenous injection according to claim 1, characterized in that: the large diameter section is formed with a guide groove extending along the axis direction and penetrating the inner and outer surfaces of the tube wall, the guide groove is formed It starts from the front positioning hole, and the front positioning hole is formed by a front end of the guide groove extending laterally along the tube wall to form a positioning part, so that the protruding bolt is stuck against the positioning part, and the needle hub is positioned on the tube wall. The position in front of the barrel, and the dial control is a positioning part that can drive the protruding bolt out of the front positioning hole, so that the protruding bolt is displaced along the guide groove from the front end of the front positioning hole. 8. The catheter guiding device for intravenous injection according to claim 7, further comprising an elastic element accommodated between the rear end of the needle hub and the inner surface of the tube wall. 9. The catheter guide device for intravenous injection according to claim 8, characterized in that: the barrel also has several ribs formed on the inner surface and adjacent to the large diameter section and the small diameter section, and the The needle base also has a ring formed on the rear end and faces the ribs to define an accommodating space. The elastic element is arranged in the aforesaid accommodating space, and has abutting against the ribs and the accommodating space respectively. At the two top ends of the ring, when the needle base is positioned in front of the barrel, the elastic element is in a compressed state. 10. The catheter guiding device for intravenous injection according to claim 8, characterized in that: the rear end of the needle base and the inner surface of the barrel relative to the large-diameter section are respectively formed with a ring extending radially , and a rear rim extending along the axial direction, the rim and the rear rim define an accommodating space with the rear end, the elastic element is housed in the aforesaid accommodating space, and has a And a front end and a rear end fastened by the rear ring edge are used to stretch the elastic element when the needle base is positioned at the front position of the barrel. 11. The intravenous catheter guiding device as claimed in claim 8, further comprising more than one buckle, the buckle is pivotally mounted on the outer surface of the barrel with a fulcrum, and has a pressing end forming the protrusion, And a driving end opposite to the pressing end relative to the fulcrum, so that the protruding bolt can be separated from the pipe of the tube in the radial direction, and release the needle holder. The elastic element is accommodated at the rear end of the needle holder and between the inner surfaces of the tube wall. 12. The catheter guide device for intravenous injection according to claim 1, characterized in that: the front end of the needle hub is inserted into the small diameter section of the tube, and the ring wall of the catheter hub is sleeved on the tube On the small diameter section of the barrel. 13. The catheter guiding device for intravenous injection according to claim 1, characterized in that: the front end and the rear end of the needle base are in a detachable state, and the needle base also has a direction extending from the rear end along the axis a connecting portion extending forward and defining an axial channel to communicate with the chamber, and a fitting portion extending rearward from the front end along the axial direction, the fitting portion being enlarged by the front end of the tube The open end is sleeved with the connecting part, so that the needle body and the chamber communicate with each other, and the ring wall of the catheter base is sleeved with the front end of the needle base. 14. The catheter guiding device for intravenous injection according to claim 13, characterized in that: when the catheter together with the catheter adapter and the sheathing part are combined, they can cooperate with the needle body to form a functional unit of a detachable intravenous catheter , to match the clinical use of catheters of different diameters.

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