JP2005253613A - Retractable medical blood collecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable medical blood collecting device easily retracting a cannula. <P>SOLUTION: This retractable medical blood collecting device is provided with a cannula seat slidably inserted from a rear opening end of a barrel; the cannula extending to the inside of the cannula seat and, when the front end of a blood collecting tube is inserted in the circumferential edge part, breaking through a stopper by the tip of a rear needle part; a hub retaining the needle part and disposed to, when the cannula seat is in a front retaining position, make the needle part into a use state of being disposed from a front opening end of the barrel and, when the cannula seat is in a rear retaining position, to make the needle part retract into a retracted state of being retracted in the front opening end of the barrel; and a retaining mechanism which comprises a locking means locking the rearward sliding of the cannula seat in the front retaining position; and an operating means constituted to be operated from the outside and, when being operated, releasing the locking of the locking means and simultaneously sliding the cannula seat in the rear retaining position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a medical blood collection device, and more particularly, to a retractable medical blood collection device that can be stored in a barrel after use without exposing a cannula.

  As shown in FIGS. 1 and 2, a retractable medical device 1 with an openable / closable cap disclosed in US Pat. No. 5,810,775 includes an outer tube 11, a sliding tube 12, a retracting seat 13, and a cannula 14. And a spring 15. The outer tube 11 has a front end opening 111 and a rear end opening 112, and the cap 16 is attached to the rear end opening 112 so that the rear end opening 112 can be closed. The sliding tube 12 has a front end opening 121 and a rear end opening 122, and the front end opening 121 is closely fitted near the stopper 113 provided in the front end opening of the outer tube 11 via the retracting seat 13. Yes. In this way, the retractable seat 13 is held in the front end opening 121 of the sliding tube 12. The cannula 14 has front and rear ends 142, 141, and the front end 142 is inserted into the retracting seat 13 so as to be exposed outside the front end opening of the outer tube. A spring 15 is compressed between the sliding tube 12 and the retracting seat 13.

  When blood is collected using the medical device 1, first, the front end 142 of the cannula 14 is punctured into a patient's blood vessel. Then, a blood collection tube (not shown) with a stopper at its tip is inserted into the outer tube 11 from the rear end opening 111 of the outer tube 11, and then pushed forward to be inserted into the sliding tube 12, and the cannula. After the rear end of 14 penetrates the rubber sheath 17 and the stopper of the blood collection tube, blood is collected. After the blood collection is completed, the blood collection tube is taken out from the outer tube 11. Then, the cap 16 is closed and brought into contact with the rear end opening 122 of the sliding tube 12, and the sliding tube 12 is pressed against the stopper 112 and slid to lock the retracting seat 13 to the sliding tube 12. At the same time, the retracting seat 13 is withdrawn from the sliding tube 12, and at the same time, the compression of the spring 15 is released, and the retracting seat 13 can be pushed to pull the cannula 14 into the sliding tube 12.

  However, in such a medical device, after the blood collection is completed, the cannula 14 is pulled into the sliding tube 12 by holding the outer tube with one hand and pushing the sliding tube 12 while closing the cap 16 with the other hand. Since it must be done, it is quite inconvenient in operation. Further, since the outer diameter of the blood collection tube is somewhat smaller than the inner diameter of the sliding tube 12, a considerable gap is generated between the blood collection tube and the sliding tube, and the blood collection tube shakes during blood collection, causing pain to the patient. There is also a drawback of making you feel.

  FIG. 3 shows an example of an intravenous catheter insertion device. The intravenous catheter insertion device 9 includes a cannula seat 91 having a hub 911 at a front end thereof, a cannula 92 fixed to the cannula seat 91, a catheter hub 93 externally fitted to the cannula seat 91, and a catheter hub. And a flexible catheter 94 that is inserted into the cannula 92 and has a needle tip exposed to the outside.

  When using such an intravenous catheter insertion device, the patient's blood vessel is punctured with the needle tip of the cannula 92 and then the flexible catheter 94 is inserted into the patient's blood vessel together with the cannula 92. Subsequently, while removing the cannula 92 from the catheter 94 with one hand, pressure is applied to the catheter 94 with the other hand to place the catheter 94 in the blood vessel. Then, an infusion device or a hollow barrel is connected to the catheter hub 93 to perform drug injection or blood collection. Immediately after the cannula 92 is removed from the catheter 94, infusion or blood collection must be performed. Therefore, the cannula seat 91 and the cannula 92 are placed in a familiar place. Accidents that can hurt personnel may occur.

  In view of the above, a main object of the present invention is to provide a retractable medical blood collection device that can be easily retracted even with one hand.

  Another object of the present invention is to provide a medical blood collection device that can be used as an intravenous catheter insertion device, can perform blood collection and drug injection, and can avoid accidental punctures.

  In order to achieve the above object, the present invention provides a retractable cannulated medical device for collecting blood by inserting a blood collection tube having a front end opening and a stopper sealed with the front end opening and penetrated by a needle. A blood collection device for blood, wherein two front and rear opening ends facing each other in the axial direction thereof, a passage extending between the two front and rear opening ends and communicating with the openings of the two opening ends are formed, and A barrel having a small-diameter portion close to the front opening end and a peripheral wall composed of a large-diameter portion close to the rear opening end, and a straight tube having both front and rear ends, the rear end being open The front end of the blood collection tube is inserted, and the front end edge of the peripheral portion is reduced while extending forward to form a connecting portion that has a small passage to the outside of the front, And from the rear opening end of the barrel, in the passage of the large diameter portion A cannula seat slidably inserted back and forth between a front holding position close to the small diameter portion along the axial direction and a rear holding position close to the rear opening end, and along the axial direction The front and rear two needle portions extend on a straight line, and the front and rear ends of the entire needle portion are respectively needle tips, and the rear needle portion passes through the small passage of the connecting portion of the cannula seat. The cannula is extended into the cannula seat, and when the front end of the blood collection tube is inserted into the peripheral edge, the cannula that breaks the stopper with the needle tip of the rear needle part, and the front needle part are retained, When the cannula seat is in the front holding position, the front needle portion is exposed from the front opening end of the barrel, and when the cannula seat is in the rear holding position, the front needle portion is in the barrel. A hub disposed in the connecting portion of the cannula seat so as to be retracted into the front opening end, a holding hole formed in the wall surface of the large diameter portion, and the cannula seat in the front holding position The locking means can be locked in the holding hole at a certain time, and can lock the cannula seat and prevent the cannula seat in the front holding position from sliding backward. The holding mechanism is configured to be operated from the outside. When operated, the holding mechanism is unlocked, and at the same time, the actuating means slides the cannula seat to the rear holding position. A retractable medical blood collection device is provided.

  In the retractable medical blood collection device according to the present invention having the above-described structure, when the operating means is operated with fingers while holding the barrel with one hand, the locking means is released and the cannula seat is moved to the rear. Since the cannula can be retracted into the barrel according to the sliding of the cannula seat at the same time as sliding to the holding position, the cannula can be easily retracted into the barrel with one hand.

  Moreover, it is preferable that several protrusion is formed in the said barrel along the circumferential direction on the inner wall face near the said rear opening end of the large diameter part in the said barrel. Thereby, before blood collection, the blood collection tube can be inserted into the barrel in advance and the blood collection tube can be held by the plurality of protrusions, so that the patient feels pain due to shaking of the blood collection tube during blood collection. Can be avoided.

  Furthermore, the retractable medical blood collection device of the present invention has a duct extending in the front-rear direction and having both front-rear opening, and the rear-end opening is detachably fitted to the small-diameter portion, A catheter hub whose front end opening is tapered forward from the rear end opening and a straight thin tube having two front and rear ends, and its rear end is inserted and fixed from the front end opening of the catheter hub. The catheter further includes a catheter communicating with the duct, and the front needle portion is inserted through the catheter so that the needle tip is exposed forward from the front end portion of the catheter.

  According to this configuration, at the time of blood collection or drug injection, the patient's blood vessel is punctured with the needle tip of the needle portion, and then the catheter is inserted into the patient's blood vessel together with the cannula 92. Thus, blood collection or drug injection can be performed as in the prior art, and when the operating means is operated with one hand, the locking means is released and the cannula seat is moved to the rear holding position at the same time. Since the cannula can be retracted into the barrel according to the sliding of the cannula seat, it is possible to prevent a conventional accidental puncture accident.

  Hereinafter, preferred embodiments of the retractable medical blood collection device of the present invention will be described with reference to the drawings.

  First, a first embodiment of the retractable medical blood collection device of the present invention will be described with reference to FIGS. 4 to 7. The retractable medical blood collection apparatus according to the present embodiment collects blood by inserting a blood collection tube 5 (see FIG. 6) having a front end opening 52 and a stopper 51 that is sealed with a front end opening 52 and penetrated by a needle. And includes a barrel 2, a cannula seat 3, a cannula 41, a hub 40, holding mechanisms 231 and 232, and an actuating means 34.

  The barrel 2 extends between the two front and rear opening ends 224 and 223 facing each other in the axial direction and the two front and rear opening ends 224 and 223 and communicates the openings of the two opening ends. And a peripheral wall 22 composed of a small diameter portion 225 close to the front opening end 224 and a large diameter portion 229 close to the rear opening end 223.

  The cannula seat 3 has a front holding position close to the small diameter portion 225 along the axial direction and a rear holding position close to the rear opening end 223 in the passage 21 of the large diameter portion 22 from the rear opening end 223 of the barrel 2. Inserted and held so that it can slide back and forth. The cannula seat 3 is a straight tube having both front and rear ends, a peripheral portion 324 where the rear end is open and the front end 52 of the blood collection tube 5 is inserted, and the cannula seat 3 is contracted while extending forward from the front end edge of the peripheral portion 324. And a connecting portion 322 having a small passage 325 to the front outside.

  The cannula 41 is extended so that two needle parts 413 and 411 are formed integrally on a straight line along the axial direction. In addition, the front and rear ends 414 and 412 of the entire cannula 41 are respectively needle points, and the rear needle portion 411 extends into the cannula seat 3 via the small passage 325 of the connecting portion 322 of the cannula seat 3. When the front end 52 of the blood collection tube 5 is inserted into the peripheral portion 324, the stopper 51 can be broken through the needle tip 412 of the rear needle portion 411. Further, a rubber sheath 42 is provided in the peripheral edge portion 324 so as to cover the rear needle portion 411.

  The hub 40 has a cannula holding space 401 that extends along the axial direction and communicates with the small passage 325 of the connecting portion 324, holds the front needle portion 413 in the cannula holding space 401, and When the seat 3 is in the front holding position, the front needle portion 413 is exposed from the front opening end 224 of the barrel 2, and when the cannula seat 3 is in the rear holding position, the front needle portion 413 is in the barrel 2. The cannula seat 3 is integrally disposed with the connecting portion 322 so as to be retracted into the front opening end 224 of the cannula seat 3. The inner wall surface of the small diameter portion 225 gradually tapers from the large diameter portion 229 to the front opening end 224. Therefore, the hub 40 is limited to the inside of the small diameter portion 225 in the barrel 2 and can be prevented from being removed from the front end opening 224 of the barrel 2, and the skin and the subcutaneous blood vessel are easily accessible during blood collection.

  The holding mechanism is locked in the holding hole 231 and the cannula seat 3 when the holding hole 231 formed in the wall surface of the large diameter portion 229 and the cannula seat 3 are in the front holding position. And a locking means 232 that can prevent the cannula seat 3 in the front holding position from sliding backward.

  In this embodiment, the holding hole 231 is a through hole, and the rear holding position is formed at the end of the long through hole 24 extending rearward from the holding hole 231 on the wall surface of the large diameter portion 229 in the barrel 2. A rear holding hole 233 corresponding to the above is formed. Further, the long through hole 24 communicates with the holding hole 231 and the rear holding hole 233 via the front contraction part 25 and the rear contraction part 26, respectively.

  The locking means 232 protrudes from the outer wall surface of the peripheral edge portion 324 and is exposed as an operating end via the elongated through hole 24, and the cannula seat 3 is moved from the front holding position to the rear holding position. When sliding, according to sliding of the cannula seat 3, it is possible to slide from the holding hole 231 to the rear holding hole 233 along the long through hole 24. Therefore, when the cannula seat 3 is in the front holding position and the rear holding position, respectively, the locking means 232 is limited to the front and rear two contracting portions 25 and 26 and is locked to the holding hole 231 and the rear holding hole 233. Sliding is prevented.

  A slit 27 is formed on the wall surface of the large diameter portion 229 so as to extend from the rear holding hole 233 to the rear opening end 223 of the barrel 2. As a result, the flexibility of the large-diameter portion 229 has been increased to some extent, so that the locking means 232 passes from the front and rear two holding holes 231 and 233 to the front and rear two contracted portions 25 and 26 and into the elongated through-hole 24. In addition to being easy to enter, it can be pushed into the elongated through hole 24 via the slit 27 and installed.

  The actuating means 34 is configured to be operated from the outside. When operated, the actuating means 34 releases the locking means 232 and simultaneously slides the cannula seat 3 to the rear holding position. In this embodiment, the operating means 34 is connected to the operating end of the locking means 232 so as to be on the outer surface 222 of the peripheral wall 22 of the barrel 2, and is operated to slide along the elongated through hole 24. The locking means 232 can also slide along the cannula seat 3 accordingly.

  A plurality of locking ribs 226 are formed on the outer peripheral surface of the small diameter portion 225 so as to extend along the axial direction. A protector 45 that covers the front needle portion 413 that is locked to the plurality of locking ribs and exposed to the outside of the front end opening 224 is fitted on the small diameter portion 225.

  As shown in FIG. 5, the retractable medical blood collection device of the present embodiment is initially in a state where the locking means 232 is locked in the holding hole 231 and the cannula seat 3 is held in the front holding position. . When trying to use this blood collection device, first, the protector 45 is removed from the small diameter portion 45 of the barrel, and then the patient's blood vessel is punctured with the needle tip 414 of the front needle portion 413. At this time, blood flows into the rubber sheath 42 via the cannula 41. Then, as shown in FIG. 6, the blood collection tube 5 is inserted into the barrel, and then pushed forward to be inserted into the cannula seat 3, first the rubber sheath 42 and the needle tip of the rear needle portion 411 of the cannula 41, and Blood is collected after passing through the stopper 51 of the blood collection tube 5.

  After blood collection is completed, the blood collection tube 5 is removed. Then, the operating means 34 is operated with a finger, the locking means 232 is slid along the elongated through hole 24 to the rear holding hole 233, and the cannula seat 3 is slid to the rear holding position. In this way, the cannula 41 can be retracted into the barrel 2 as shown in FIG.

  Next, FIG. 8 and FIG. 9 show a modification of the first embodiment. The present modification is different from the first embodiment in that the rear opening end 224 of the large-diameter portion 229 in the barrel 2 has inner and outer ring surfaces sandwiching the inner and outer wall surfaces from the outside, and the inner An annular ring 28 in which a plurality of protrusions 282 protrude along the circumferential direction is fitted on the annular surface. Accordingly, the blood collection tube 5 can be inserted into the barrel 2 in advance before blood collection, and the blood collection tube can be held by the plurality of protrusions 282, so that the patient feels pain due to shaking of the blood collection tube during blood collection. Can be avoided.

  FIG. 10 shows a second embodiment of the present invention. In the present embodiment, the difference from the first embodiment is that the front needle portion 413 and the rear needle portion 411 of the cannula 4 are separate bodies, and the cannula holding space 401 is the front needle portion 413 and the rear needle portion 411, respectively. The front and rear two areas 4013 and 4011 and the front and rear two elements 4013 and 4011 are connected to the front and rear two areas 4013 and 4011, and the displayable intermediate area 402 can visually recognize the blood passing therethrough from the outside. As a result, the front needle portion 413 and the rear needle portion are respectively held in the front and rear two areas 4013 and 4011 and can communicate with each other via the intermediate area 402. It can be confirmed that the cannula 41 is reliably punctured into the blood vessel of the patient.

  Next, FIG. 11 and FIG. 12 show a third embodiment of the present invention. In this embodiment, the second embodiment is different from the second embodiment in that it has a trigger 63 pivotally supported on the outer wall surface 222 of the barrel 2 as an element of the actuating means, and further, a peripheral portion 324 of the cannula seat 3. The elastic urging means 61 is interposed between the outer wall surface of the barrel 2 and the inner wall surface 221 of the barrel 2 so as to urge the cannula seat 3 toward the rear position. More specifically, the trigger 63 is pivotally supported on the outer wall surface 222 of the barrel 2 via a C clip 6) fitted on the outer wall surface 222 of the barrel 2, and is integrally connected to the locking means 632. And a working end 633 that can release the locking means 632 from being locked by the holding hole 231 when operated.

  Further, an annular shoulder portion 227 is formed on the inner wall surface of the barrel 2 adjacent to the small diameter portion 225 of the large diameter portion 22 and is annularly formed so as to face the annular shoulder portion 227 forward on the outer wall surface of the peripheral edge portion 324 of the cannula seat 3. A flange is formed to protrude. The elastic biasing means 61 is a coil spring, and when the cannula seat 3 is in the front holding position, it is forcibly sandwiched between the annular shoulder 227 and the annular flange 323 to generate the biasing force. And can.

  When the operating end 633 of the trigger 63 is pressed with a finger after blood collection is completed, the locking means 632 is released from the locking by the holding hole 231 and at the same time, the urging force of the elastic urging means is released, The cannula seat 3 is pressed into the rear holding position and the cannula 41 can be retracted into the barrel 2.

  FIG. 13 shows a modification of the third embodiment. In this modification, the difference from the third embodiment is that there are two holding holes 231, which are symmetrically formed on the wall surface of the large diameter portion of the barrel, and the locking means 623 and the trigger 63 are accordingly There are two each. Thereby, since the urging force of the elastic urging means 61 can be balanced, the cannula 41 can be gently pulled into the barrel.

  14 and 15 show a fourth embodiment of the present invention. In this embodiment, the difference from the second embodiment is that the holding hole 231 extends in the circumferential direction from the front end of the long through hole 24, and the near end 241 close to the long through hole 24. And a distal end portion 242 away from the elongated through hole 24, and a front contraction portion 25 is formed between the near end portion 241 and the far end portion 242. In addition, the cannula seat 3 is moved to the rear holding position between the outer wall surface of the peripheral portion of the cannula seat 3 and the inner wall surface of the barrel 2 as in the third embodiment. The elastic urging means 61 for providing the urging force is interposed. Thereby, when the locking means 232 is placed on the far end 242, the rearward sliding and the subsequent rearward sliding of the cannula seat 3 are completely prevented in the shape of the holding hole 231, so Can be gently locked.

  FIG. 16 and FIG. 17 show a fifth embodiment of the present invention. The present embodiment is different from the fourth embodiment in that an annular projecting edge 36 is formed on the outer wall surface of the peripheral edge portion 324 of the cannula seat 3 and the annular edge 220 is formed on the inner wall surface of the large-diameter portion 229 of the barrel 2. Is formed so as to face the annular projecting edge 36 forward, and the elastic biasing means 7 is hooked on the annular projecting edge 36 and the edge 220 at the front and rear ends 71 and 72, respectively. In this way, when the cannula seat is in the front holding position, the elastic biasing means 7 moves the cannula seat 3 toward the rear holding position by pulling the front and rear ends 71 and 72 thereof. It is possible to give an energizing force.

  18 and 19 show a sixth embodiment and a seventh embodiment of the present invention, respectively. The two embodiments differ from the above-described embodiments in that a catheter hub 431 and a catheter 432 are further provided. More specifically, a duct 433 extending in the front-rear direction and having front and rear end openings 436 and 435 is formed in the catheter hub 431. The rear end opening 435 is externally fitted to the tip 228 of the small diameter portion 225 so as to be detachable. The front end opening 436 extends forward from the rear end opening 435 in a tapered manner.

  The catheter 432 is a straight thin tube having two front and rear ends 438 and 437, and the rear end 437 is inserted and fixed from the front end opening 436 of the catheter hub 431 and communicates with the duct 433. The front needle portion 413 is inserted through the catheter 432 such that the needle tip 414 is exposed forward from the front end portion 438 of the catheter 432.

  At the time of blood collection, the front end of the catheter also punctures the patient's blood vessel at the same time as the needle tip of the front needle 413 punctures the patient's blood vessel. Then, after blood collection is completed, the front needle part 413 is drawn into the barrel 2, and then the distal end 228 of the small diameter part 225 is extracted from the rear end opening of the catheter hub 431, and the catheter 432 is left in the patient's blood vessel as it is. The Therefore, the infusion device is subsequently connected to the catheter hub 431, and the medicine can be injected.

  FIG. 20 shows an eighth embodiment of the present invention. In the present embodiment, the difference from the above-described embodiment is that the hub 40 is externally fitted to the connecting portion 322 so as to be detachable from the front opening end 224 of the barrel 2, and blood passing therethrough is visually recognized from the outside. And a holding portion 405 that extends forward from the fitting portion 404 and can hold the front needle portion 413. Thereby, the front needle part 413 which has a suitable pipe diameter can be used as needed.

  FIG. 21 shows a ninth embodiment of the present invention. The present embodiment is different from the eighth embodiment in that a catheter hub 431 and a catheter 432 are provided.

  More specifically, the catheter hub 431 is formed with a duct 433 extending in the front-rear direction and having front and rear end openings 436 and 435, and the rear end opening 435 is detachably attached to the holding portion 405 of the hub 40. It is fitted. The front end opening 436 extends forward from the rear end opening 435 in a tapered manner.

  The catheter 432 is a straight thin tube having two front and rear ends 438 and 437, and the rear end 437 is inserted and fixed from the front end opening 436 of the catheter hub 431 and communicates with the duct 433. The front needle portion 413 is inserted through the catheter 432 such that the needle tip 414 is exposed forward from the front end portion 438 of the catheter 432.

  As described above, the retractable medical blood collection device of the present invention operates the operating means with its fingers while holding the barrel with one hand, and releases the locking of the locking means to open the cannula seat. At the same time as sliding to the rear holding position, the cannula can be retracted into the barrel according to the sliding of the cannula seat, so that the cannula can be easily retracted into the barrel with one hand.

  Further, the retractable medical blood collection device of the present invention is formed on the inner wall surface near the rear opening end of the large-diameter portion of the barrel such that a plurality of protrusions protrude into the barrel along the circumferential direction. In this embodiment, before blood collection, the blood collection tube can be inserted into the barrel in advance and the blood collection tube can be held by the plurality of protrusions. It can avoid feeling pain.

  Furthermore, the retractable medical blood collection device of the present invention has a duct extending in the front-rear direction and having both front-rear opening, and the rear-end opening is detachably fitted to the small-diameter portion, A catheter hub whose front end opening is tapered forward from the rear end opening and a straight thin tube having two front and rear ends, and its rear end is inserted and fixed from the front end opening of the catheter hub. If the embodiment further comprises a catheter communicating with the duct, and the front needle portion is inserted through the catheter so that the needle tip is exposed forward from the front end portion of the catheter At the time of blood collection or drug injection, the blood vessel of the patient is punctured with the needle tip of the needle portion, and then the catheter is inserted into the blood vessel of the patient together with the cannula. Thus, blood collection or drug injection can be performed as in the prior art, and when the operating means is operated with one hand, the locking means is released and the cannula seat is moved to the rear holding position at the same time. Since the cannula can be retracted into the barrel according to the sliding of the cannula seat, it is possible to prevent a conventional accidental puncture accident.

  As described above, the present invention can provide a retractable medical blood collection device that can be easily retracted even with one hand and that is convenient to operate.

1 is a cross-sectional view of a retractable medical device disclosed in US Pat. No. 5,810,775. FIG. It is sectional drawing which shows the state which the cannula in the medical device of the said FIG. 1 retracted in the outer tube | pipe. It is an exploded view which shows the conventional intravenous catheter insertion apparatus. 1 is an exploded view showing a retractable medical blood collection device according to a first embodiment of the present invention. FIG. It is sectional drawing which shows the retractable medical blood-collecting apparatus in the said 1st Embodiment. It is sectional drawing which shows the state in which the cannula seat in the said 1st Embodiment exists in a front holding position. It is sectional drawing which shows the state in which the cannula seat in the said 1st Embodiment exists in a back holding position. It is sectional drawing which shows the retractable medical blood-collecting apparatus in the modification of the said 1st Embodiment. It is a side view which shows the annular ring in the said modification. It is sectional drawing which shows the state in which the cannula seat in the 2nd Embodiment of this invention exists in a front holding position. It is sectional drawing which shows the state which the cannula seat in the 3rd Embodiment of this invention exists in a front holding position. It is sectional drawing which shows the state which the cannula seat in the 3rd Embodiment of this invention exists in a back holding position. It is sectional drawing which shows the state in which the cannula seat in the modification of the 3rd Embodiment of this invention exists in a front holding position. It is sectional drawing which shows the state in which the cannula seat in the 4th Embodiment of this invention exists in a front holding position. It is sectional drawing which shows the state which the cannula seat in the 4th Embodiment of this invention exists in a back holding position. It is sectional drawing which shows the state which the cannula seat in the 5th Embodiment of this invention exists in a front holding position. It is sectional drawing which shows the state which the cannula seat in the 5th Embodiment of this invention exists in a back holding position. It is a fragmentary sectional view which shows the retractable type medical blood collection device in the 6th Embodiment of this invention. It is a fragmentary sectional view which shows the retractable type medical blood collection device in the 7th Embodiment of this invention. It is a fragmentary sectional view which shows the retractable type medical blood collection device in the 8th Embodiment of this invention. It is a fragmentary sectional view which shows the retractable type medical blood collection device in the 9th Embodiment of this invention.

Explanation of symbols

2 barrel 21 passage 22 peripheral wall 220 annular edge 221 inner wall 222 outer wall 223 rear opening end 224 front opening end 225 small diameter portion 226 locking rib 227 annular shoulder 228 tip 229 large diameter portion 231 holding hole 232 locking means 233 rear holding Hole 24 Long hole 241 Near end 242 Far end 25 Front contraction 26 Rear contraction 27 Slit 28 Annular ring 282 Projection 3 Cannula seat 322 Connection part 323 Annular flange 324 Peripheral part 325 Small passage 34 Actuating means 36 Annular projection Edge 40 Hub 401 Cannula holding space 4011 Rear area 4013 Front area 402 Middle area 404 Fitting portion 405 Holding portion 41 Cannula 411 Rear needle portion 412 Needle tip 413 Front needle portion 414 Needle tip 42 Rubber sheath 431 Catheter hub 432 Catheter 435 Rear end opening 436 Front end opening 43 Rear end 438 front end 45 protector 5 blood collection tube 51 stopper 52 the front end opening 61 resilient biasing means 62 C clip 63 triggered 631 load end 632 engaging means 633 working end 7 elastic biasing means 71 front 72 rear

Claims (17)

In a medical blood collection device with a retractable cannula for collecting blood by inserting a blood collection tube having a front end opening and a stopper sealed by the front end opening and penetrated by a needle,
Two front and rear open ends opposed to each other in the axial direction, and a passage extending between the two front and rear open ends to communicate the openings of the two open ends, and the front open end A barrel having a small-diameter portion close to the rear wall and a peripheral wall made of a large-diameter portion close to the rear opening end;
A straight tube having both front and rear ends, a peripheral portion where the rear end is open and the front end of the blood collection tube is inserted, and a small passage to the front outside world which is contracted while extending forward from the front end edge of the peripheral portion And a front holding position adjacent to the small diameter portion along the axial direction from the rear opening end of the barrel into the passage of the large diameter portion. A cannula seat inserted and held so as to be slidable back and forth between a rear holding position adjacent to the rear opening end;
The two front and rear needle portions extend in a straight line along the axial direction, and the front and rear ends of the needle portions are respectively needle tips, and the rear needle portion is a connecting portion of the cannula seat. A cannula extending into the cannula seat via a small passage, and when the front end of the blood collection tube is inserted into the peripheral portion, the cannula breaks through the stopper at the needle tip of the rear needle portion;
When the front needle part is held and the cannula seat is in the front holding position, the front needle part is exposed from the front opening end of the barrel, and when the cannula seat is in the rear holding position. A hub disposed in the connecting portion of the cannula seat so that the front needle portion is retracted into the front opening end of the barrel;
When the holding hole formed in the wall surface of the large-diameter portion and the cannula seat are in the front holding position, the holding hole is locked in the holding hole, and the cannula seat is locked to the front holding position. A holding mechanism comprising locking means capable of preventing backward sliding of the cannula seat at
It is configured to be operated from the outside. When operated, the locking means is unlocked, and at the same time, an operating means for sliding the cannula seat to the rear holding position is provided. Retractable medical blood collection device. The holding hole is a through hole, and a rear holding hole corresponding to the rear holding position at the end of the long through hole extending from the holding hole to the wall surface of the large-diameter portion of the barrel. Is formed,
The locking means protrudes from the outer wall surface of the peripheral edge and is exposed as an operating end via the elongated through hole, and the cannula seat slides from the front holding position to the rear holding position. The retractable medical blood collection according to claim 1, wherein when the cannula seat slides, the cannula can slide from the holding hole to the rear holding hole along the elongated through hole. apparatus.   The actuating means is connected to the actuating end of the locking means so as to be on the outer surface of the peripheral wall of the barrel. When operated and slid along the elongated through hole, the locking means also 3. The retractable medical blood collection device according to claim 2, wherein the cannula seat can be taken and slid accordingly.   The elongated through holes communicate with the holding hole and the rear holding hole via the front contraction part and the rear contraction part, respectively, and the locking means is in the front holding position and the rear holding position, respectively. 4. The retractable medical blood collecting device according to claim 3, wherein the retractable medical blood collecting device is restricted to the two front and rear contraction portions and is locked to the holding hole and the rear holding hole to prevent the sliding thereof.   5. The retractable medical blood collecting device according to claim 4, wherein a slit is further formed on the wall surface of the large diameter portion so as to extend from the rear holding hole to a rear opening end of the barrel.   The holding hole extends in the circumferential direction from the front end of the long through hole, and has a near end portion close to the long through hole and a far end portion away from the long through hole. So that when the locking means is placed at the distal end, the rearward sliding and the subsequent rearward sliding of the cannula seat are completely prevented by the shape of the retaining hole, so that 4. The retractable medical blood collecting device according to claim 3, wherein the retractable medical blood collecting device is gently locked.   As one component of the actuating means, an elastic force is applied between the outer peripheral edge of the cannula seat and the inner wall surface of the barrel to apply a biasing force to the cannula seat to move the cannula seat toward the rear holding position. 7. The retractable medical blood collecting apparatus according to claim 6, further comprising a biasing means. An annular shoulder is formed on the inner wall surface of the barrel near the small diameter portion of the large diameter portion, and an annular flange is formed to project forward on the outer wall surface of the peripheral edge of the cannula seat so as to face the annular shoulder portion. Has been
The elastic biasing means is a coil spring, and when the cannula seat is in the front holding position, the elastic biasing means is forcibly sandwiched between the annular shoulder and the annular flange to generate the biasing force. The retractable medical blood collection device according to claim 7 An annular protruding edge is formed on the outer wall surface of the peripheral edge of the cannula seat, and an annular edge is formed on the inner wall surface of the large-diameter portion of the barrel so as to face the annular protruding edge forward.
The elastic biasing means is a coil spring, and both ends of the coil spring are hooked on the annular projecting edge and the edge, respectively, and when the cannula seat is in the front holding position, the annular projecting edge and the 8. The retractable medical blood collecting device according to claim 7, wherein the cannula seat is provided with a biasing force that is pulled between the edge and moves the cannula seat toward the rear holding position. As an element of the actuating means, a trigger pivotally supported on the outer wall surface of the barrel is provided. When the trigger is actuated, the trigger is pivotally connected to the locking means. In addition to having an operating end that can release the locking means from being locked by the holding hole,
An elastic biasing means is interposed between the outer wall surface of the peripheral portion of the cannula seat and the inner wall surface of the barrel so that the cannula seat is biased toward the rear position. The retractable medical blood collection device according to claim 1.   The retractable medical blood collecting apparatus according to claim 1, wherein the front needle part and the rear needle part are integrally formed.   The hub has a cannula holding space extending along the axial direction. The cannula holding space has two front and rear areas for holding the front needle portion and the rear needle portion, and the front and rear two elements. The retractable medical blood collecting device according to claim 1, further comprising a displayable intermediate area that is connected to the blood vessel and can visually recognize blood passing therethrough from the outside.   The retractable medical blood collection according to claim 1, wherein a plurality of protrusions are formed in the barrel along a circumferential direction on an inner wall surface of the large diameter portion of the barrel near the rear opening end. apparatus. A duct extending in the front-rear direction and having openings at both front and rear ends is formed, and the rear end opening is detachably fitted to the small diameter portion, and the front end opening extends forwardly from the rear end opening. A catheter hub,
A straight thin tube having two front and rear ends, and a rear end of the catheter is inserted and fixed from the front end opening of the catheter hub and communicates with the duct;
The retractable medical blood collection device according to claim 1, wherein the front needle portion is inserted through the catheter so that a needle tip thereof is exposed forward from a front end portion of the catheter.   The hub is externally fitted to the connecting portion so as to be detachable from the front opening end of the barrel, and a fitting portion that allows the blood passing therethrough to be visually recognized from the outside, and extends forward from the fitting portion. The retractable medical blood collection device according to claim 1, further comprising a holding portion capable of holding the front needle portion. A duct extending in the front-rear direction and having openings at both front and rear ends is formed, and the rear end opening is detachably fitted to the holding portion of the hub, and the front end opening is tapered forward from the rear end opening. A catheter hub extended to
A straight thin tube having two front and rear ends, and a rear end of the catheter is inserted and fixed from the front end opening of the catheter hub and communicates with the duct;
16. The retractable medical blood collection device according to claim 15, wherein the front needle portion is inserted through the catheter so that the needle tip is exposed forward from the front end portion of the catheter. The cannula seat is formed integrally with the hub;
The retractable medical blood collection device according to claim 1, wherein an inner wall surface of a small diameter portion in the barrel gradually tapers from the large diameter portion to the front opening end.

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