CN106581802B

CN106581802B - Needle-free medical connector

Info

Publication number: CN106581802B
Application number: CN201510660413.7A
Authority: CN
Inventors: 蔡溪进
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-10-14
Filing date: 2015-10-14
Publication date: 2020-07-07
Anticipated expiration: 2035-10-14
Also published as: CN106581802A

Abstract

A needle-free medical connector comprises a cover body, a joint and an elastic body. The cover body is provided with a containing chamber, a jack and a connecting port. The joint comprises a combination part, and the combination part is connected with the connecting port. The elastomer includes head, shoulder, body portion and base, and the head is located jack and its inside shrinkage pool that forms, and the shoulder leans on in the lid inside wall from horizontal extension of head lateral wall and its lateral wall, and the shoulder top forms the ring concave, and body portion locates and holds the room and enclose and construct the hollow space, and the hollow space communicates in the shrinkage pool, and body portion bottom is located to the base and leans on in combination portion. Thus, when the body of the elastic body is pressed, the body can be easily bent and deformed from the folded edge.

Description

Needle-free medical connector

Technical Field

The present invention relates to a needle-free medical connector, and more particularly, to a needle-free medical connector that is easily bent and deformed.

Background

In order to prevent patients from suffering from the pain of puncturing skin by a needle during injection repeatedly and facilitate medical staff to add medicine to the patients more easily and efficiently, a general infusion device is provided with a needle-free medical connector on a pipeline or an upper cover of a measuring cylinder, the patients only need to be applied with one infusion, the medical staff can add medicine to the patients repeatedly by the needle-free medical connector, the trouble of repeated application is avoided, the pain of the patients is relieved, and the infusion device is very convenient and ideal to use.

The conventional needle-free medical connector comprises a cover body, a joint and an elastic body. The cover body forms a containing chamber and an upper opening. The connector is detachably arranged at the bottom of the cover body and is provided with a flow channel. The elastomer is arranged in the accommodating chamber, and the bottom end of the elastomer is abutted against the joint. When the syringe containing liquid medicine is inserted into the upper opening of the cover body in use, one end of the syringe is provided with a needle head seat, the needle head seat presses the top of the elastic body to bend the elastic body, and the liquid medicine in the syringe at the moment flows into the flow channel of the joint after flowing into the elastic body through the chamber of the cover body and is drained into the body of a patient.

However, the elastomer of the conventional needle-free medical connector is too thick in overall thickness to be easily bent and deformed. The user must exert a great force to deform the elastic body completely, which is very laborious.

Furthermore, the bottom of the elastomer of the conventional needle-free medical connector is not fixed, so the elastomer can be separated from the joint.

In view of the above, it is an urgent need for those skilled in the art to provide a needle-free medical connector, in which the elastic body is easy to bend and deform without separating from the connector.

Disclosure of Invention

The main object of the present invention is to provide a needle-free medical connector in which an elastic body is easily bent and deformed without being separated from a connector.

In order to achieve the above objective, the present invention provides a needle-free medical connector, which includes a cover, a connector and an elastic body.

The cover body encloses a chamber and has a first end and a second end, the first end forms an insertion hole, and the second end forms a connection port.

The connector comprises a combination part and an insertion part, the combination part is connected with the connecting port of the cover body, the insertion part forms an insertion groove, the connector forms a flow passage, and the flow passage is communicated with the accommodating chamber.

The elastic body comprises a head part, a shoulder part, a body part and a base, wherein the head part is positioned in the jack of the first end of the cover body, a concave hole is formed in the head part, the shoulder part transversely extends from the outer side wall of the head part, the outer side wall of the shoulder part is abutted against the inner side wall of the cover body, a ring groove is formed in the top end of the shoulder part, the body part is arranged in the accommodating chamber and encloses a hollow space, the hollow space is communicated with the concave hole, and the base is arranged at the bottom end of the body part and is abutted against the combined part of the joint.

According to a preferred embodiment, the cover includes a plurality of pressing blocks, the pressing blocks protrude from a sidewall of the chamber of the cover, a protrusion protrudes downward from a bottom end of each pressing block, a ring protrusion extends laterally from the base, a ring groove is formed at a top of the ring protrusion, and the protrusion of the pressing block is disposed in the ring groove.

According to a preferred embodiment, the top end of the combined portion of the joint forms a ring groove, and the bottom of the base of the elastic body protrudes downwards to form a bump, and the bump is disposed on the ring groove.

The invention has the advantage that when the body part of the elastic body is extruded, the body part can be easily bent and deformed from the folded edge. Moreover, the base of the elastic body is pressed by the pressing block of the cover body, and the bump at the bottom of the base is fixed on the annular groove of the combined part of the joint, so that the fixing effect is good, and the base cannot be separated from the combined part of the joint.

Drawings

Fig. 1 is a perspective view of a first embodiment of a needle-free medical connector of the present invention.

Fig. 2 is an exploded view of a first embodiment of the needle-free medical connector of the present invention.

Fig. 2A is a perspective view of an elastomer of a first embodiment of the needle-free medical connector of the present invention.

Fig. 3 is a sectional view taken along line III-III of fig. 1.

Fig. 4 is a sectional view taken along line IV-IV of fig. 1.

Fig. 5 is a schematic view of the elastomer of the first embodiment of the needle-free medical connector of the present invention being deformed by being pressed against by a syringe.

Fig. 6 is a cross-sectional view of a second embodiment of the needle-free medical connector of the present invention.

Fig. 7 is a schematic view of the elastomer of the second embodiment of the needle-free medical connector of the present invention being deformed by being pressed against by a syringe.

Fig. 8 is a perspective view of a high flow connector of a third embodiment of the needle-free medical connector of the present invention.

Fig. 9 is a schematic view of the elastomer of the third embodiment of the needle-free medical connector of the present invention being deformed by being pressed against by a syringe.

Fig. 10 is a perspective view of an elastomer of a fourth embodiment of the needle-less medical connector of the present invention.

Fig. 11 is a cross-sectional view of an elastomer of a fourth embodiment of the needle-less medical connector of the present invention.

Fig. 12 is a cross-sectional view of an elastomer of a fifth embodiment of the needle-less medical connector of the present invention.

Fig. 13 is a perspective view of an elastomer of a sixth embodiment of the needle-free medical connector of the present invention.

Fig. 14 is a cross-sectional view of an elastomer of a sixth embodiment of the needle-less medical connector of the present invention.

Fig. 15 is a cross-sectional view of a seventh embodiment of the needle-free medical connector of the present invention.

Fig. 16 is a cross-sectional view of an eighth embodiment of the needle-free medical connector of the present invention.

Fig. 17 is a cross-sectional view of a ninth embodiment of the needle-free medical connector of the present invention.

Fig. 18 is a cross-sectional view of a tenth embodiment of the needle-free medical connector of the present invention.

Fig. 19 is a cross-sectional view of an eleventh embodiment of the needle-free medical connector of the present invention.

Fig. 20 is a cross-sectional view of a twelfth embodiment of the needle-free medical connector of the present invention.

Fig. 21 is a cross-sectional view of a thirteenth embodiment of the needle-free medical connector of the present invention.

Wherein the reference numerals are as follows:

1 Syringe

2 piston rod

10 cover body

11 chamber

13 first end

131 jack

15 second end

151 connection port

17 briquetting

171 drainage space

173 convex part

20. 20 ', 20' joint

21. 21' combined part

211 ring groove

213 airway

215 groove

217 column

2171 gap

23 insertion part

231. 231' inserting groove

25 guide tube

27. 27' flow passage

271. 271 ', 271' first channel

271' 1 longitudinal channel

271' 2 transverse channel

273. 273' second channel

30. 30 ', 30' elastomer

31. 31' head

311. 311' concave hole

33. 33 ', 33 "' shoulder

331 th order

333 annular concave

335 round corner

35. 35 ', 35 "' body part

351 hollow space

352. 352 ', 352 "' concave curved surface

353. 353' ″ smooth curved surface

354. 354 ', 354' ″ folded edge

357 ', 357' convex arc curved surface

37 base

371 ring convex

3711 Ring groove

373 bump

39 gap

The L1-L4 axis

Detailed Description

The embodiments of the present invention will be described in more detail with reference to the drawings and the accompanying drawings, so that those skilled in the art can implement the embodiments of the present invention after studying the specification.

Referring to fig. 1 to 4, fig. 1 is a perspective view of a needle-free medical connector according to a first embodiment of the present invention; FIG. 2 is an exploded view of a first embodiment of the needle-free medical connector of the present invention; FIG. 2A is a perspective view of the elastomer of the first embodiment of the needle-free medical connector of the present invention; FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1; fig. 4 is a sectional view taken along line IV-IV of fig. 1. The invention provides a needle-free medical connector, which comprises a cover body 10, a joint 20 and an elastic body 30.

The cover 10 encloses a chamber 11 and has a first end 13 and a second end 15. The first end 13 has a receptacle 131 formed therein and an outer sidewall of the first end 13 is externally threaded. The second end 15 forms a connection port 151. The chamber 11 is disposed between the insertion hole 131 and the connection port 151. The cover 10 includes a plurality of pressing blocks 17, and the pressing blocks 17 protrude from the sidewall of the accommodating chamber 11 of the cover 10 and are arranged at equal intervals. Thereby, a drainage space 171 is formed between every two pressing blocks 17, and the drainage space 17 is communicated with the accommodating chamber 11. Each pressing piece 17 is wedge-shaped, and one end of each pressing piece is flat, and the other end of each pressing piece is flat and thick, as shown in fig. 3 and 4. More specifically, the end of each pressing piece 17 that is sharp and flat is the top end thereof, and the end of each pressing piece 17 that is flat and thick is the bottom end thereof. The front edge of the bottom end of each pressing block 17 protrudes downward with a convex part 173.

The connector 20 includes a combining portion 21, an inserting portion 23 and a conduit 25. The combining portion 21 is connected to the connecting opening 151 of the second end 15 of the cover 10. Wherein a ring groove 211 is formed at the top end of the combining portion 21. The insertion part 23 forms an insertion groove 231. In the present embodiment, the inner wall surface of the insertion groove 231 is annularly provided with an internal thread. The combination portion 21 is provided with an air passage 213, and the air passage 213 penetrates through the top and bottom ends of the combination portion 21 and is connected to the insertion groove 231. Thus, the connector 20 is a positive pressure connector. The conduit 25 extends downward from the bottom end of the combining portion 21 through the insertion slot 231. The connector 20 forms a flow passage 27, and the flow passage 27 includes a first passage 271 and a second passage 273. The first channel 271 transversely penetrates both sides of the combining portion 21. The second passage 273 extends longitudinally through the conduit 25 and communicates with the first passage 271.

The elastic body 30 may be made of silicone or other elastic material capable of deforming and restoring to its original shape. The elastic body 30 includes a head 31, a shoulder 33, a body 35 and a base 37. The head 31 is located in the insertion hole 131 of the first end 13 of the cover 10, and a concave hole 311 is formed therein. The wall of the portion of the head 31 surrounding the recess 311 has a uniform thickness, i.e., the wall of the portion of the head 31 surrounding the recess 311 has no thicker or thinner portions. Preferably, the head 31 is cylindrical, and the recess 311 is a circular hole, so that the wall surface of the portion of the head 31 surrounding the recess 311 is a circular wall with uniform thickness, that is, the inner and outer wall surfaces of the circular wall have a common center. The shoulder 33 extends laterally from the outer sidewall of the head 31. The outer sidewall of the shoulder 33 forms a step 331, and the step 331 abuts against the inner sidewall of the cover 10. Thus, the insertion hole 131 and the accommodating chamber 11 are not communicated with each other. The top end of the shoulder 33 forms an annular recess 333, and the annular recess 333 is located near the junction of the shoulder 33 and the head 31. The junction of the step 331 and the top of the shoulder 33 forms a fillet 335. The body 35 is disposed in the accommodating chamber 10 and encloses a hollow space 351, and the hollow space 351 is communicated with the recess 311 and the air passage 213. Wherein a concave arc curved surface 352 is formed on the outer side wall of the body 35 near the bottom end of the body 35, a smooth curved surface 353 is formed on the outer side wall of the body 35 near the shoulder 33, and the smooth curved surface 353 is connected between the outer side wall of the shoulder 33 and the concave arc curved surface 352 on the outer side wall of the body 35. The inner wall of the body 35 is a smooth curved surface corresponding to the smooth curved surface 353 and the concave arc curved surface 352 of the outer wall of the body 35. The thickness of the minimum interval between the concave arc 352 of the outer sidewall of the body 35 and the inner sidewall of the body 35 is smaller than the thickness of the rest of the body 35 to form a folded edge 354, that is, the folded edge 354 is the thinnest part of the body. Wherein the thickness of the flap 354 is between one-half and one-fifth of the thickness of the thickest part of the body part 35. Wherein the distance between the folded edge 354 and the top end of the body 35 is between one half and four fifths of the distance between the top end and the bottom end of the body 35 (i.e., the total length of the body 35). Preferably, the distance between the folded edge 354 and the top end of the body 35 is seven tenths of the distance between the top end and the bottom end of the body 35. The base 37 is disposed at the bottom end of the body 35 and extends laterally to form a ring-shaped protrusion 371, a suitable distance is kept between the ring-shaped protrusion 371 and the inner sidewall of the cover 10 to form a gap 39, and the gap 39 is communicated between the drainage space 171 and the first channel 271 of the flow channel 27. The top of the annular protrusion 371 forms an annular groove 3711, and the protrusion 173 of the pressing block 17 is disposed in the annular groove 3711. A protrusion 373 (shown in FIG. 2A) protrudes downward from the bottom of the base 37, and the protrusion 373 is disposed in the groove 211.

The following description will explain the usage of the present invention in conjunction with the drawings. Fig. 5 is a schematic view illustrating the elastic body of the needle-free medical connector according to the first embodiment of the present invention being pressed and deformed by the syringe. First, a pipe (not shown) is screwed into the insertion groove 231, and the guide tube 25 is inserted into the pipe. When the syringe 1 filled with the liquid medicine is inserted into the insertion hole 131, the syringe 1 presses against the head 31 of the elastic body 30 to deform the head 31 of the elastic body 30 until the head 31 of the elastic body 30 is deformed to the limit. Then, the syringe 1 is continuously pressed against the head 31 of the elastic body 30, so that the body 35 of the elastic body 30 starts to be pressed by the head 31 of the elastic body 30 and starts to deform. Wherein the body portion 35 of the elastic body 30 is bent inward from one side of the folded edge 354 and outward from the other side. Thus, the step 331 of the shoulder 33 of the elastic body 30 is far away from the inner sidewall of the cover 10, so that the insertion hole 131 is communicated with the chamber 11. After the syringe 1 passes through the receptacle 131, it enters the chamber 11. A piston rod 2 is pushed to fill the liquid medicine in the syringe 1 into the chamber 11. The chemical liquid flows through the drain space 171, the slit 39, and the first and second passages 271, 272 of the flow passage 27, and then enters the pipe line. Importantly, during the deformation of the elastic body 30, the air in the hollow space 351 of the body 35 and the recess hole 311 of the head 31 is squeezed to flow from the air passage 213 to the insertion groove 231. After the syringe 1 is removed from the insertion hole 131, the elastic body 30 is restored to the original shape by its own elastic force so that the chamber 11 and the insertion hole 131 are restored to a state of not communicating with each other, as shown in fig. 3 and 4.

Referring to fig. 6 and 7, fig. 6 is a cross-sectional view of a second embodiment of the needle-free medical connector of the present invention; fig. 7 is a schematic view of the elastomer of the second embodiment of the needle-free medical connector of the present invention being deformed by being pressed against by a syringe. The second embodiment of the present invention is substantially the same in construction as the first embodiment, with the difference being that the construction of the joint 20' is slightly different. More specifically, the first passage 271' extends transversely through one side of the combining portion 21 to communicate with the slit 39. Thus, the connector 20' becomes another type of positive pressure connector.

Fig. 8 is a perspective view of a high flow connector of a third embodiment of the needle-free medical connector of the present invention. The third embodiment of the present invention is constructed substantially the same as the first embodiment, except that the fitting 20 "is a high flow negative pressure fitting. More specifically, the combining portion 21 ″ does not have the ring groove 211 and the air channel 213, but forms a groove 215, and a plurality of protruding pillars 217 protrude upward from the bottom of the groove 215. The second channel 273 "extends longitudinally through the bottom of the recess 215 and communicates with the engagement slot 231". The protruding columns 217 surround the opening of the second channel 273 ″ at the bottom side of the groove 215, and a gap 2171 is formed between every two protruding columns 217. The first channel 271 "includes a plurality of longitudinal channels 271" 1 and a plurality of transverse channels 271 "2. The longitudinal channel 271 "1 is formed in the inner sidewall of the groove 215. The transverse channel 271 "2 is formed at the bottom of the groove 215 and has one end communicating with one of the longitudinal channels 271" 1 and the other end extending to the bottom of one of the notches 2171 to communicate with the second channel 271 "2. When the piston rod 2 is pushed to fill the chamber 11 with the medical fluid in the syringe 1, the medical fluid flows through the chamber 11, the drainage space 171, the slit 39, the longitudinal channel 271 "1 and the transverse channel 271" 2 of the first passage 271 "of the flow channel 27", the groove 215, the notch 2171 and the second passage 273 ", and then enters the conduit (not shown), as shown in fig. 9. Importantly, the hollow space 351 of the body portion 35 communicates with the recess 215 and the second channel 273 "of the flow channel 27". Thus, during the deformation of the elastic body 30, the air in the concave hole 311 of the head 31 and the hollow space 351 of the body 35 is pressed to enter the inserting groove 231 "through the concave groove 215 and the second channel 273" of the flow channel 27 ".

Referring to fig. 10 and 11, fig. 10 is a perspective view of an elastic body of a needle-free medical connector according to a fourth embodiment of the present invention; fig. 11 is a cross-sectional view of an elastomer of a fourth embodiment of the needle-less medical connector of the present invention. The fourth embodiment of the present invention has substantially the same structure as the first embodiment, except that the structure of the elastic body 30' is slightly different. More specifically, the outer sidewall of the body 35 'of the elastic body 30' forms a convex curved surface 357 'near the shoulder 33', and the convex curved surface 357 'is connected between the outer sidewall of the shoulder 33' and the concave curved surface 352 'of the outer sidewall of the body 35'. Thereby, the outer side wall of the body portion 35 'of the elastic body 30' is S-shaped. The inner sidewall of the body 35 ' corresponding to the convex arc 357 ' of the outer sidewall of the body 35 ' and the concave arc 352 ' of the outer sidewall of the body 35 ' is a concave arc, and only the inner sidewall of the body 35 ' protrudes slightly inward to form a convex arc near the bottom of the body 35 '. Wherein the folded edge 354 ' is located at the junction of the convex arc surface 357 ' of the outer sidewall of the body 35 ' and the concave arc surface 352 ' of the outer sidewall of the body 35 '. In this embodiment, the distance between the folded edge 354 ' and the top end of the body 35 ' is seven tenth of the distance between the top end and the bottom end of the body 35 '. Wherein the thickness of the maximum interval between the convex arc 357 'of the outer sidewall of the body 35' and the inner sidewall of the body 35 'is equal to the thickness of the maximum interval between the concave arc 352' of the outer sidewall of the body 35 'and the inner sidewall of the body 35'. Preferably, the thickness of the flap 354 ' is one third of the thickness of the thickest part of the body 35 ', i.e., the thickness of the flap 354 ' is sufficiently less than two thirds of the thickness of the thickest part of the body.

Referring to fig. 12, a cross-sectional view of an elastomer of a fifth embodiment of the needle-free medical connector of the present invention is shown. The fifth embodiment of the present invention has substantially the same structure as the first embodiment, and differs therefrom in that the elastic body 30 ″ has a slightly different structure. More specifically, the outer side wall of the body 35 "of the elastic body 30" does not have the concave arc curved surface, the axis L1 of the concave hole 311 "of the head 31" of the elastic body 30 "and the axis L2 of the head 31" of the elastic body 30 "are parallel to each other but do not overlap, and the axis L3 of the hollow space 351" of the body 35 "of the elastic body 30" and the axis L4 of the body 35 "of the elastic body 30" are parallel to each other but do not overlap. In other words, the axis L1 is spaced from the axis L2, and the axis L3 is spaced from the axis L4. Thus, the wall surface of the concave hole 311 formed in the head 31 of the elastic body 30 "is gradually reduced in thickness from one side to the other side, and the body 35 of the elastic body 30" is gradually reduced in thickness from one side to the other side. Preferably, the axis L3 of the hollow space 351 "of the body 35" of the elastic body 30 "overlaps with the axis L1 of the concave hole 311", and the axis L4 of the body 35 "of the elastic body 30" overlaps with the axis L2 of the head 31 "of the elastic body 30". Thus, the direction in which the wall surface of the concave hole 311 formed in the head 31 of the elastic body 30 "is gradually reduced in thickness coincides with the direction in which the body 35 of the elastic body 30" is gradually reduced in thickness. In other embodiments, the direction in which the wall surface of the concave hole 311 formed in the head 31 of the elastic body 30 "is gradually reduced does not coincide with or is not impossible to the direction in which the wall surface of the body 35 of the elastic body 30" is gradually reduced.

Referring to fig. 13 and 14, fig. 13 is a perspective view of an elastic body of a sixth embodiment of the needle-free medical connector according to the present invention; fig. 14 is a cross-sectional view of an elastomer of a sixth embodiment of the needle-less medical connector of the present invention. The sixth embodiment of the present invention has substantially the same structure as the fourth embodiment, except that the structure of the elastic body 30' ″ is slightly different. More specifically, the outer sidewall of the body 35 "' of the elastic body 30" ' forms a convex curved surface 357 "' and a smooth curved surface 35" ' near the shoulder 33 "', and the convex curved surface 357" ' is connected between the outer sidewall of the shoulder 33 "' and the concave curved surface 352" ' of the outer sidewall of the body 35 "'. Thus, half of the outer side wall of the body portion 35 "'of the elastic body 30"' is S-shaped, and the other half is circular. The inner sidewall of the body 35 "' corresponding to the convex arc surface 357" ' of the outer sidewall of the body 35 "' and the concave arc surface 352" ' of the outer sidewall of the body 35 "' is a concave arc surface, and the inner sidewall of the body 35" ' only protrudes slightly inward near the bottom end of the body 35 "' to form a convex arc shape. Wherein the folded edge 354 "' is located at the connection between the convex arc curved surface 357" ' of the outer sidewall of the body 35 "' and the concave arc curved surface 352" ' of the outer sidewall of the body 35 "'. Wherein the thickness of the maximum interval between the convex arc curved surface 357 '"of the outer sidewall of the body 35'" and the inner sidewall of the body 35 '"is equal to the thickness of the maximum interval between the concave arc curved surface 352'" of the outer sidewall of the body 35 '"and the inner sidewall of the body 35'.

Fig. 15 is a cross-sectional view of a seventh embodiment of the needle-free medical connector of the present invention. The seventh embodiment of the present invention has substantially the same structure as the first embodiment, except that the bottom of the base 37 is a flat surface, so the bump 373 is not provided. Meanwhile, the top end of the assembly portion forms a plane, so the ring groove 211 is not provided.

Fig. 16 is a cross-sectional view of an eighth embodiment of the needle-free medical connector of the present invention. The eighth embodiment of the present invention has substantially the same structure as the second embodiment, except that the structure of the cover 10, the joint 20 and the elastic body 30 are slightly different. More specifically, the inner sidewall of the cover 10 does not have the pressing block 17, the depth of the annular groove 211 at the top end of the combining part 21 of the joint 20 is relatively deep, and the base 37 of the elastic body 30 does not extend laterally to form the annular protrusion 371 but extends downward, and is completely inserted into the annular groove 211 at the top end of the combining part 21 to complete the assembly, so the bottom of the base 37 of the elastic body 30 does not have or need the protrusion 373.

Fig. 17 is a cross-sectional view of a ninth embodiment of the needle-free medical connector of the present invention. The ninth embodiment of the present invention is substantially the same as the fourth embodiment, except that the structures of the cover, the joint, and the elastic body 30' are slightly different. More specifically, the structure of the cover and the joint is the same as that of the cover and the joint of the eighth embodiment, and thus not shown. The base 37 'of the elastic body 30' does not extend laterally to form the annular protrusion 371, but extends downward, and is completely inserted into the annular groove 211 at the top end of the combining part 21 to complete the assembly, so that the bottom of the base 37 'of the elastic body 30' does not have or need the protrusion 373.

Referring to fig. 18, a cross-sectional view of a tenth embodiment of the needle-free medical connector of the present invention is shown. The tenth embodiment of the present invention is substantially the same in structure as the fifth embodiment, except that the structure of the cover, the joint, and the elastic body 30 "are slightly different. More specifically, the structure of the cover and the joint is the same as that of the cover and the joint of the eighth embodiment, and thus not shown. The base 37 of the elastic body 30 "does not extend laterally to form the annular protrusion 371, but extends downward, and is completely inserted into the annular groove 211 at the top end of the combining part 21 to complete the assembly, so that the bottom of the base 37 of the elastic body 30" does not have or need the protrusion 373.

Referring to fig. 19, a cross-sectional view of an eleventh embodiment of the needle-free medical connector of the present invention is shown. The eleventh embodiment of the present invention is substantially the same in structure as the sixth embodiment, except that the structure of the cover, the joint, and the elastic body 30' ″ is slightly different. More specifically, the structure of the cover and the joint is the same as that of the cover and the joint of the eighth embodiment, and thus not shown. The base 37 '"of the elastic body 30'" does not extend laterally to form the annular protrusion 371, but extends downward and is completely inserted into the annular groove 211 at the top end of the assembly portion 21 to complete the assembly, so that the bottom of the base 37 '"of the elastic body 30'" does not have or need the protrusion 373.

Fig. 20 is a cross-sectional view of a twelfth embodiment of the needle-free medical connector of the present invention. The twelfth embodiment of the present invention has substantially the same structure as the fourth embodiment, except that the distance between the folded edge 354 ' and the top end of the body 35 ' is one half of the distance between the top end and the bottom end of the body 35 '.

Referring to fig. 21, a cross-sectional view of a thirteenth embodiment of the needle-free medical connector of the present invention is shown. The thirteenth embodiment of the present invention is substantially the same as the twelfth embodiment, except that the structures of the cover, the joint, and the elastic body 30' are slightly different. More specifically, the structure of the cover and the joint is the same as that of the cover and the joint of the eighth embodiment, and thus not shown. The base 37 'of the elastic body 30' does not extend laterally to form the annular protrusion 371, but extends downward, and is completely inserted into the annular groove 211 at the top end of the combining part 21 to complete the assembly, so that the bottom of the base 37 'of the elastic body 30' does not have or need the protrusion 373.

The invention can achieve the following effects:

firstly, the ring recess 333 at the top end of the shoulder 33, 33 ' of the elastic body 30, 30 ' can make the head 31 of the elastic body 30, 30 ' easier to bend and deform. In particular, when the ring recess 333 is located near the connection between the shoulder 33, 33 'and the head 31, the head 31 of the elastic body 30, 30' is more easily bent and deformed.

Second, the folded

edge

354, 354 ' is the thinnest part of the body portion 35, 35 ' of the elastic body 30, 30 '. Thus, when the body 35, 35 ' of the elastic body 30, 30 ' is pressed, it can be easily bent and deformed from the folded

edge

354, 354 '. Particularly, when the thickness of the folded

edge

354, 354 'is between one half and one fifth of the thickness of the thickest portion of the body portion 35, 35' and the distance between the folded

edge

354, 354 'and the top end of the body portion 35, 35' is between one half and four fifths of the distance between the top end and the bottom end of the body portion 35, 35 ', the body portion 35, 35' of the elastic body 30, 30 'can be bent and deformed more easily from the folded

edge

354, 354'. When the thickness of the folded

edge

354, 354 'is one third of the thickness of the thickest part of the body portion 35, 35' and the distance between the folded

edge

354, 354 'and the top end of the body portion 35, 35' is seven tenth of the distance between the top end and the bottom end of the body portion 35, 35 ', the body portion 35, 35' of the elastic body 30, 30 'is more easily bent and deformed from the folded

edge

354, 354'.

Thirdly, the wall thickness of the part of the elastic body 30 surrounding the concave hole 311 is uniform. Thereby, the head 31 of the elastic body 30 can be easily bent and deformed.

Fourthly, the step 331 of the shoulder 33, 33 'of the elastic body 30, 30' abuts against the inner sidewall of the cover 10. Therefore, the elastic bodies 30 and 30' completely seal the opening between the insertion hole 131 and the accommodating chamber 11, so as to achieve the effect of bidirectional waterproof.

Fifth, the base 37 of the elastic body 30, 30 'is firmly pressed by the pressing block 17 of the cover 10, and the protrusion 373 of the bottom thereof is tightly fixed to the annular groove 211 of the combining portion 21 of the joint 20, 20', so that the elastic body 30, 30 'is not separated from the combining portion 21 of the joint 20, 20'.

Sixthly, when the joints 20 and 20' are positive pressure joints and the piston rod 2 in the syringe 1 is pulled, the pressure in the chamber 11 and the flow passage 27 is not changed. Therefore, the liquid remained in any position of the cover 10, the connectors 20, 20 ' and the elastic bodies 30, 30 ' will continuously flow into the pipeline connected with the connectors 20, 20 ', further flow into the blood vessel of the patient from the pipeline, and will not flow back to the injector 1. Moreover, since the hollow space 351 of the body 35, 35 'of the elastic body 30, 30' is not communicated with the accommodating chamber 11 and the flow channel 27, the elastic body 30, 30 'has no dead space, and after the medicine is added, the outer side wall of the elastic body 30, 30' is easily washed clean by the washing liquid (e.g. saline). In addition, the present invention can perform blood drawing without causing hemolysis (erythrocyte rupture) by the characteristics of the technical characteristics.

Seventh, when the connector 20 ″ is a high-flow negative pressure connector and the piston rod 2 in the syringe 1 is pulled, the pressure in the chamber 11 and the flow channel 27 ″ is affected and changed during the process of the elastic bodies 30 and 30 ' recovering the shape, so that the liquid flows back into the hollow space 351 of the body 35 and 35 ' of the elastic bodies 30 and 30 '. Therefore, after the addition of the chemicals, the elastomer 30, 30' must be cleaned completely by using a larger amount of flushing fluid (e.g., saline) than the positive pressure connector. Furthermore, the connector 20 "is not suitable for blood withdrawal. However, the advantage of this joint 20 "is that it provides a large flow rate of the liquid to be delivered.

Eighth, the fifth embodiment and the tenth embodiment of the present invention have a feature of uneven thickness because the wall surface of the concave hole 311 formed in the head portion 31 of the elastic body 30 "and the thickness of the body portion 35 of the elastic body 30" are gradually reduced in the same direction. Thus, the head 31 and the body 35 of the elastic body 30 "are easily bent and deformed from the thinner side.

The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting thereof, since any modification or variation thereof within the spirit of the invention is intended to be covered thereby.

Claims

1. A needle-free medical connector, comprising:

the cover body encloses a containing chamber and is provided with a first end and a second end, the first end is provided with a jack, the second end is provided with a connecting port, the cover body comprises a plurality of pressing blocks, the pressing blocks protrude out of the side wall of the containing chamber of the cover body and are arranged at equal intervals, a drainage space is formed between every two pressing blocks and is communicated with the containing chamber, each pressing block is wedge-shaped, one end of each pressing block is flat, the other end of each pressing block is flat and thick, the end of each pressing block which is flat and flat is the top end of the pressing block, the end of each pressing block which is flat and thick is the bottom end of the pressing block, and the bottom end of each pressing;

a joint, including a combination part, a plug part and a conduit, the combination part is connected to the connection port of the cover body, the plug part forms a plug groove, the conduit extends downwards from the bottom end of the combination part through the plug groove, the joint forms a flow channel, the flow channel includes a first channel and a second channel, the first channel transversely penetrates through two sides of the combination part, the second channel longitudinally penetrates through the conduit and is communicated with the first channel; and

an elastic body, including a head, a shoulder, a body and a base, the head locates in the jack of the first end of the body, and its inside forms a concave hole, the shoulder extends horizontally from the lateral wall of the head, and the lateral wall of the shoulder leans against the inside wall of the body, and the top of the shoulder forms a ring concave, the body locates in the chamber and encloses a hollow space, the hollow space communicates with the concave hole, the base locates in the bottom of the body and leans against the combination portion of the joint, the base extends horizontally a ring convex, keep a suitable distance between the lateral wall of the ring convex and the inside wall of the body and form a gap, the gap communicates between the drainage space and the first channel, the top of the ring convex forms a ring ditch, the convex part of the briquetting locates in the ring ditch, the top of the combination portion of the joint leans against the bottom of the base of the elastic body, the top end of the combined part of the joint forms an annular groove, and a lug is downwards protruded from the bottom of the base of the elastic body and is arranged on the annular groove.

2. The needle-free medical connector as claimed in claim 1, wherein the outer sidewall of the body portion forms a concave arc surface near the bottom end of the body portion, and the thickness of the concave arc surface at the minimum interval from the inner sidewall of the body portion is smaller than the thickness of the rest of the body portion to form a folded edge.

3. The needle-free medical connector as claimed in claim 2, wherein the outer sidewall of the body portion forms a convex curved surface adjacent to the shoulder portion, the convex curved surface is connected between the outer sidewall of the shoulder portion and the concave curved surface, and a portion of the inner sidewall of the body portion corresponding to the convex curved surface of the outer sidewall of the body portion and the concave curved surface of the outer sidewall of the body portion is a concave curved surface.

4. The needle-free medical connector as claimed in claim 3, wherein the folded edge is located at a junction of the convex arc curved surface of the outer sidewall of the body and the concave arc curved surface of the outer sidewall of the body, and a maximum interval between the convex arc curved surface of the outer sidewall of the body and the inner sidewall of the body has a thickness equal to a maximum interval between the concave arc curved surface of the outer sidewall of the body and the inner sidewall of the body.

5. The needle-free medical connector as claimed in claim 2, wherein the outer sidewall of the body portion is formed with a smooth curved surface adjacent to the shoulder portion, the smooth curved surface is connected between the outer sidewall of the shoulder portion and the concave arc curved surface, and a portion of the inner sidewall of the body portion corresponding to the smooth curved surface and the concave arc curved surface of the outer sidewall of the body portion is a smooth curved surface.

6. The needle-free medical connector as claimed in claim 2, wherein a convex arc curved surface and a smooth curved surface are formed on the outer sidewall of the body portion near the shoulder portion, the convex arc curved surface is connected between the outer sidewall of the shoulder portion and the concave arc curved surface, a portion of the inner sidewall of the body portion corresponding to the convex arc curved surface of the outer sidewall of the body portion and the concave arc curved surface of the outer sidewall of the body portion is a concave arc curved surface, and a portion of the inner sidewall of the body portion corresponding to the smooth curved surface of the outer sidewall of the body portion is a smooth curved surface.

7. The needle-free medical connector of claim 1, wherein the ring is recessed proximate a junction of the shoulder and the head.

8. The needle-free medical connector of claim 1, wherein an outer sidewall of the shoulder of the elastomer forms a step that abuts an inner sidewall of the cap.

9. The needle-free medical connector of claim 1, wherein an axis of the hollow space of the body of the elastomer and an axis of the body of the elastomer are parallel to each other but do not overlap, and an axis of the recessed hole and an axis of the head of the elastomer are parallel to each other but do not overlap.